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permissions and\n * limitations under the License.\n */\n/* eslint-disable no-unused-vars, no-restricted-globals */\n\n'use strict';\n\nvar pdfjsVersion =\n  typeof PDFJSDev !== 'undefined' ? 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the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport './compatibility';\nimport { ReadableStream } from './streams_polyfill';\nimport { URL } from './url_polyfill';\n\nconst IDENTITY_MATRIX = [1, 0, 0, 1, 0, 0];\nconst FONT_IDENTITY_MATRIX = [0.001, 0, 0, 0.001, 0, 0];\n\nconst NativeImageDecoding = {\n  NONE: 'none',\n  DECODE: 'decode',\n  DISPLAY: 'display',\n};\n\n// Permission flags from Table 22, Section 7.6.3.2 of the PDF specification.\nconst PermissionFlag = {\n  PRINT: 0x04,\n  MODIFY_CONTENTS: 0x08,\n  COPY: 0x10,\n  MODIFY_ANNOTATIONS: 0x20,\n  FILL_INTERACTIVE_FORMS: 0x100,\n  COPY_FOR_ACCESSIBILITY: 0x200,\n  ASSEMBLE: 0x400,\n  PRINT_HIGH_QUALITY: 0x800,\n};\n\nconst TextRenderingMode = {\n  FILL: 0,\n  STROKE: 1,\n  FILL_STROKE: 2,\n  INVISIBLE: 3,\n  FILL_ADD_TO_PATH: 4,\n  STROKE_ADD_TO_PATH: 5,\n  FILL_STROKE_ADD_TO_PATH: 6,\n  ADD_TO_PATH: 7,\n  FILL_STROKE_MASK: 3,\n  ADD_TO_PATH_FLAG: 4,\n};\n\nconst ImageKind = {\n  GRAYSCALE_1BPP: 1,\n  RGB_24BPP: 2,\n  RGBA_32BPP: 3,\n};\n\nconst AnnotationType = {\n  TEXT: 1,\n  LINK: 2,\n  FREETEXT: 3,\n  LINE: 4,\n  SQUARE: 5,\n  CIRCLE: 6,\n  POLYGON: 7,\n  POLYLINE: 8,\n  HIGHLIGHT: 9,\n  UNDERLINE: 10,\n  SQUIGGLY: 11,\n  STRIKEOUT: 12,\n  STAMP: 13,\n  CARET: 14,\n  INK: 15,\n  POPUP: 16,\n  FILEATTACHMENT: 17,\n  SOUND: 18,\n  MOVIE: 19,\n  WIDGET: 20,\n  SCREEN: 21,\n  PRINTERMARK: 22,\n  TRAPNET: 23,\n  WATERMARK: 24,\n  THREED: 25,\n  REDACT: 26,\n};\n\nconst AnnotationFlag = {\n  INVISIBLE: 0x01,\n  HIDDEN: 0x02,\n  PRINT: 0x04,\n  NOZOOM: 0x08,\n  NOROTATE: 0x10,\n  NOVIEW: 0x20,\n  READONLY: 0x40,\n  LOCKED: 0x80,\n  TOGGLENOVIEW: 0x100,\n  LOCKEDCONTENTS: 0x200,\n};\n\nconst AnnotationFieldFlag = {\n  READONLY: 0x0000001,\n  REQUIRED: 0x0000002,\n  NOEXPORT: 0x0000004,\n  MULTILINE: 0x0001000,\n  PASSWORD: 0x0002000,\n  NOTOGGLETOOFF: 0x0004000,\n  RADIO: 0x0008000,\n  PUSHBUTTON: 0x0010000,\n  COMBO: 0x0020000,\n  EDIT: 0x0040000,\n  SORT: 0x0080000,\n  FILESELECT: 0x0100000,\n  MULTISELECT: 0x0200000,\n  DONOTSPELLCHECK: 0x0400000,\n  DONOTSCROLL: 0x0800000,\n  COMB: 0x1000000,\n  RICHTEXT: 0x2000000,\n  RADIOSINUNISON: 0x2000000,\n  COMMITONSELCHANGE: 0x4000000,\n};\n\nconst AnnotationBorderStyleType = {\n  SOLID: 1,\n  DASHED: 2,\n  BEVELED: 3,\n  INSET: 4,\n  UNDERLINE: 5,\n};\n\nconst StreamType = {\n  UNKNOWN: 0,\n  FLATE: 1,\n  LZW: 2,\n  DCT: 3,\n  JPX: 4,\n  JBIG: 5,\n  A85: 6,\n  AHX: 7,\n  CCF: 8,\n  RL: 9,\n};\n\nconst FontType = {\n  UNKNOWN: 0,\n  TYPE1: 1,\n  TYPE1C: 2,\n  CIDFONTTYPE0: 3,\n  CIDFONTTYPE0C: 4,\n  TRUETYPE: 5,\n  CIDFONTTYPE2: 6,\n  TYPE3: 7,\n  OPENTYPE: 8,\n  TYPE0: 9,\n  MMTYPE1: 10,\n};\n\nconst VerbosityLevel = {\n  ERRORS: 0,\n  WARNINGS: 1,\n  INFOS: 5,\n};\n\nconst CMapCompressionType = {\n  NONE: 0,\n  BINARY: 1,\n  STREAM: 2,\n};\n\n// All the possible operations for an operator list.\nconst OPS = {\n  // Intentionally start from 1 so it is easy to spot bad operators that will be\n  // 0's.\n  dependency: 1,\n  setLineWidth: 2,\n  setLineCap: 3,\n  setLineJoin: 4,\n  setMiterLimit: 5,\n  setDash: 6,\n  setRenderingIntent: 7,\n  setFlatness: 8,\n  setGState: 9,\n  save: 10,\n  restore: 11,\n  transform: 12,\n  moveTo: 13,\n  lineTo: 14,\n  curveTo: 15,\n  curveTo2: 16,\n  curveTo3: 17,\n  closePath: 18,\n  rectangle: 19,\n  stroke: 20,\n  closeStroke: 21,\n  fill: 22,\n  eoFill: 23,\n  fillStroke: 24,\n  eoFillStroke: 25,\n  closeFillStroke: 26,\n  closeEOFillStroke: 27,\n  endPath: 28,\n  clip: 29,\n  eoClip: 30,\n  beginText: 31,\n  endText: 32,\n  setCharSpacing: 33,\n  setWordSpacing: 34,\n  setHScale: 35,\n  setLeading: 36,\n  setFont: 37,\n  setTextRenderingMode: 38,\n  setTextRise: 39,\n  moveText: 40,\n  setLeadingMoveText: 41,\n  setTextMatrix: 42,\n  nextLine: 43,\n  showText: 44,\n  showSpacedText: 45,\n  nextLineShowText: 46,\n  nextLineSetSpacingShowText: 47,\n  setCharWidth: 48,\n  setCharWidthAndBounds: 49,\n  setStrokeColorSpace: 50,\n  setFillColorSpace: 51,\n  setStrokeColor: 52,\n  setStrokeColorN: 53,\n  setFillColor: 54,\n  setFillColorN: 55,\n  setStrokeGray: 56,\n  setFillGray: 57,\n  setStrokeRGBColor: 58,\n  setFillRGBColor: 59,\n  setStrokeCMYKColor: 60,\n  setFillCMYKColor: 61,\n  shadingFill: 62,\n  beginInlineImage: 63,\n  beginImageData: 64,\n  endInlineImage: 65,\n  paintXObject: 66,\n  markPoint: 67,\n  markPointProps: 68,\n  beginMarkedContent: 69,\n  beginMarkedContentProps: 70,\n  endMarkedContent: 71,\n  beginCompat: 72,\n  endCompat: 73,\n  paintFormXObjectBegin: 74,\n  paintFormXObjectEnd: 75,\n  beginGroup: 76,\n  endGroup: 77,\n  beginAnnotations: 78,\n  endAnnotations: 79,\n  beginAnnotation: 80,\n  endAnnotation: 81,\n  paintJpegXObject: 82,\n  paintImageMaskXObject: 83,\n  paintImageMaskXObjectGroup: 84,\n  paintImageXObject: 85,\n  paintInlineImageXObject: 86,\n  paintInlineImageXObjectGroup: 87,\n  paintImageXObjectRepeat: 88,\n  paintImageMaskXObjectRepeat: 89,\n  paintSolidColorImageMask: 90,\n  constructPath: 91,\n};\n\nconst UNSUPPORTED_FEATURES = {\n  unknown: 'unknown',\n  forms: 'forms',\n  javaScript: 'javaScript',\n  smask: 'smask',\n  shadingPattern: 'shadingPattern',\n  font: 'font',\n};\n\nconst PasswordResponses = {\n  NEED_PASSWORD: 1,\n  INCORRECT_PASSWORD: 2,\n};\n\nlet verbosity = VerbosityLevel.WARNINGS;\n\nfunction setVerbosityLevel(level) {\n  if (Number.isInteger(level)) {\n    verbosity = level;\n  }\n}\n\nfunction getVerbosityLevel() {\n  return verbosity;\n}\n\n// A notice for devs. These are good for things that are helpful to devs, such\n// as warning that Workers were disabled, which is important to devs but not\n// end users.\nfunction info(msg) {\n  if (verbosity >= VerbosityLevel.INFOS) {\n    console.log('Info: ' + msg);\n  }\n}\n\n// Non-fatal warnings.\nfunction warn(msg) {\n  if (verbosity >= VerbosityLevel.WARNINGS) {\n    console.log('Warning: ' + msg);\n  }\n}\n\n// Deprecated API function -- display regardless of the `verbosity` setting.\nfunction deprecated(details) {\n  console.log('Deprecated API usage: ' + details);\n}\n\nfunction unreachable(msg) {\n  throw new Error(msg);\n}\n\nfunction assert(cond, msg) {\n  if (!cond) {\n    unreachable(msg);\n  }\n}\n\n// Checks if URLs have the same origin. For non-HTTP based URLs, returns false.\nfunction isSameOrigin(baseUrl, otherUrl) {\n  try {\n    var base = new URL(baseUrl);\n    if (!base.origin || base.origin === 'null') {\n      return false; // non-HTTP url\n    }\n  } catch (e) {\n    return false;\n  }\n\n  var other = new URL(otherUrl, base);\n  return base.origin === other.origin;\n}\n\n// Checks if URLs use one of the whitelisted protocols, e.g. to avoid XSS.\nfunction _isValidProtocol(url) {\n  if (!url) {\n    return false;\n  }\n  switch (url.protocol) {\n    case 'http:':\n    case 'https:':\n    case 'ftp:':\n    case 'mailto:':\n    case 'tel:':\n      return true;\n    default:\n      return false;\n  }\n}\n\n/**\n * Attempts to create a valid absolute URL.\n *\n * @param {URL|string} url - An absolute, or relative, URL.\n * @param {URL|string} baseUrl - An absolute URL.\n * @returns Either a valid {URL}, or `null` otherwise.\n */\nfunction createValidAbsoluteUrl(url, baseUrl) {\n  if (!url) {\n    return null;\n  }\n  try {\n    var absoluteUrl = baseUrl ? new URL(url, baseUrl) : new URL(url);\n    if (_isValidProtocol(absoluteUrl)) {\n      return absoluteUrl;\n    }\n  } catch (ex) { /* `new URL()` will throw on incorrect data. */ }\n  return null;\n}\n\nfunction shadow(obj, prop, value) {\n  Object.defineProperty(obj, prop, { value,\n                                     enumerable: true,\n                                     configurable: true,\n                                     writable: false, });\n  return value;\n}\n\nfunction getLookupTableFactory(initializer) {\n  var lookup;\n  return function () {\n    if (initializer) {\n      lookup = Object.create(null);\n      initializer(lookup);\n      initializer = null;\n    }\n    return lookup;\n  };\n}\n\nvar PasswordException = (function PasswordExceptionClosure() {\n  function PasswordException(msg, code) {\n    this.name = 'PasswordException';\n    this.message = msg;\n    this.code = code;\n  }\n\n  PasswordException.prototype = new Error();\n  PasswordException.constructor = PasswordException;\n\n  return PasswordException;\n})();\n\nvar UnknownErrorException = (function UnknownErrorExceptionClosure() {\n  function UnknownErrorException(msg, details) {\n    this.name = 'UnknownErrorException';\n    this.message = msg;\n    this.details = details;\n  }\n\n  UnknownErrorException.prototype = new Error();\n  UnknownErrorException.constructor = UnknownErrorException;\n\n  return UnknownErrorException;\n})();\n\nvar InvalidPDFException = (function InvalidPDFExceptionClosure() {\n  function InvalidPDFException(msg) {\n    this.name = 'InvalidPDFException';\n    this.message = msg;\n  }\n\n  InvalidPDFException.prototype = new Error();\n  InvalidPDFException.constructor = InvalidPDFException;\n\n  return InvalidPDFException;\n})();\n\nvar MissingPDFException = (function MissingPDFExceptionClosure() {\n  function MissingPDFException(msg) {\n    this.name = 'MissingPDFException';\n    this.message = msg;\n  }\n\n  MissingPDFException.prototype = new Error();\n  MissingPDFException.constructor = MissingPDFException;\n\n  return MissingPDFException;\n})();\n\nvar UnexpectedResponseException =\n    (function UnexpectedResponseExceptionClosure() {\n  function UnexpectedResponseException(msg, status) {\n    this.name = 'UnexpectedResponseException';\n    this.message = msg;\n    this.status = status;\n  }\n\n  UnexpectedResponseException.prototype = new Error();\n  UnexpectedResponseException.constructor = UnexpectedResponseException;\n\n  return UnexpectedResponseException;\n})();\n\nvar MissingDataException = (function MissingDataExceptionClosure() {\n  function MissingDataException(begin, end) {\n    this.begin = begin;\n    this.end = end;\n    this.message = 'Missing data [' + begin + ', ' + end + ')';\n  }\n\n  MissingDataException.prototype = new Error();\n  MissingDataException.prototype.name = 'MissingDataException';\n  MissingDataException.constructor = MissingDataException;\n\n  return MissingDataException;\n})();\n\nconst XRefEntryException = (function XRefEntryExceptionClosure() {\n  function XRefEntryException(msg) {\n    this.message = msg;\n  }\n\n  XRefEntryException.prototype = new Error();\n  XRefEntryException.prototype.name = 'XRefEntryException';\n  XRefEntryException.constructor = XRefEntryException;\n\n  return XRefEntryException;\n})();\n\nvar XRefParseException = (function XRefParseExceptionClosure() {\n  function XRefParseException(msg) {\n    this.message = msg;\n  }\n\n  XRefParseException.prototype = new Error();\n  XRefParseException.prototype.name = 'XRefParseException';\n  XRefParseException.constructor = XRefParseException;\n\n  return XRefParseException;\n})();\n\n/**\n * Error caused during parsing PDF data.\n */\nlet FormatError = (function FormatErrorClosure() {\n  function FormatError(msg) {\n    this.message = msg;\n  }\n\n  FormatError.prototype = new Error();\n  FormatError.prototype.name = 'FormatError';\n  FormatError.constructor = FormatError;\n\n  return FormatError;\n})();\n\n/**\n * Error used to indicate task cancellation.\n */\nlet AbortException = (function AbortExceptionClosure() {\n  function AbortException(msg) {\n    this.name = 'AbortException';\n    this.message = msg;\n  }\n\n  AbortException.prototype = new Error();\n  AbortException.constructor = AbortException;\n\n  return AbortException;\n})();\n\nvar NullCharactersRegExp = /\\x00/g;\n\nfunction removeNullCharacters(str) {\n  if (typeof str !== 'string') {\n    warn('The argument for removeNullCharacters must be a string.');\n    return str;\n  }\n  return str.replace(NullCharactersRegExp, '');\n}\n\nfunction bytesToString(bytes) {\n  assert(bytes !== null && typeof bytes === 'object' &&\n         bytes.length !== undefined, 'Invalid argument for bytesToString');\n  var length = bytes.length;\n  var MAX_ARGUMENT_COUNT = 8192;\n  if (length < MAX_ARGUMENT_COUNT) {\n    return String.fromCharCode.apply(null, bytes);\n  }\n  var strBuf = [];\n  for (var i = 0; i < length; i += MAX_ARGUMENT_COUNT) {\n    var chunkEnd = Math.min(i + MAX_ARGUMENT_COUNT, length);\n    var chunk = bytes.subarray(i, chunkEnd);\n    strBuf.push(String.fromCharCode.apply(null, chunk));\n  }\n  return strBuf.join('');\n}\n\nfunction stringToBytes(str) {\n  assert(typeof str === 'string', 'Invalid argument for stringToBytes');\n  var length = str.length;\n  var bytes = new Uint8Array(length);\n  for (var i = 0; i < length; ++i) {\n    bytes[i] = str.charCodeAt(i) & 0xFF;\n  }\n  return bytes;\n}\n\n/**\n * Gets length of the array (Array, Uint8Array, or string) in bytes.\n * @param {Array|Uint8Array|string} arr\n * @returns {number}\n */\nfunction arrayByteLength(arr) {\n  if (arr.length !== undefined) {\n    return arr.length;\n  }\n  assert(arr.byteLength !== undefined);\n  return arr.byteLength;\n}\n\n/**\n * Combines array items (arrays) into single Uint8Array object.\n * @param {Array} arr - the array of the arrays (Array, Uint8Array, or string).\n * @returns {Uint8Array}\n */\nfunction arraysToBytes(arr) {\n  // Shortcut: if first and only item is Uint8Array, return it.\n  if (arr.length === 1 && (arr[0] instanceof Uint8Array)) {\n    return arr[0];\n  }\n  var resultLength = 0;\n  var i, ii = arr.length;\n  var item, itemLength;\n  for (i = 0; i < ii; i++) {\n    item = arr[i];\n    itemLength = arrayByteLength(item);\n    resultLength += itemLength;\n  }\n  var pos = 0;\n  var data = new Uint8Array(resultLength);\n  for (i = 0; i < ii; i++) {\n    item = arr[i];\n    if (!(item instanceof Uint8Array)) {\n      if (typeof item === 'string') {\n        item = stringToBytes(item);\n      } else {\n        item = new Uint8Array(item);\n      }\n    }\n    itemLength = item.byteLength;\n    data.set(item, pos);\n    pos += itemLength;\n  }\n  return data;\n}\n\nfunction string32(value) {\n  return String.fromCharCode((value >> 24) & 0xff, (value >> 16) & 0xff,\n                             (value >> 8) & 0xff, value & 0xff);\n}\n\n// Calculate the base 2 logarithm of the number `x`. This differs from the\n// native function in the sense that it returns the ceiling value and that it\n// returns 0 instead of `Infinity`/`NaN` for `x` values smaller than/equal to 0.\nfunction log2(x) {\n  if (x <= 0) {\n    return 0;\n  }\n  return Math.ceil(Math.log2(x));\n}\n\nfunction readInt8(data, start) {\n  return (data[start] << 24) >> 24;\n}\n\nfunction readUint16(data, offset) {\n  return (data[offset] << 8) | data[offset + 1];\n}\n\nfunction readUint32(data, offset) {\n  return ((data[offset] << 24) | (data[offset + 1] << 16) |\n         (data[offset + 2] << 8) | data[offset + 3]) >>> 0;\n}\n\n// Lazy test the endianness of the platform\n// NOTE: This will be 'true' for simulated TypedArrays\nfunction isLittleEndian() {\n  var buffer8 = new Uint8Array(4);\n  buffer8[0] = 1;\n  var view32 = new Uint32Array(buffer8.buffer, 0, 1);\n  return (view32[0] === 1);\n}\n\n// Checks if it's possible to eval JS expressions.\nfunction isEvalSupported() {\n  try {\n    new Function(''); // eslint-disable-line no-new, no-new-func\n    return true;\n  } catch (e) {\n    return false;\n  }\n}\n\n/**\n * Get the value of an inheritable property.\n *\n * If the PDF specification explicitly lists a property in a dictionary as\n * inheritable, then the value of the property may be present in the dictionary\n * itself or in one or more parents of the dictionary.\n *\n * If the key is not found in the tree, `undefined` is returned. Otherwise,\n * the value for the key is returned or, if `stopWhenFound` is `false`, a list\n * of values is returned. To avoid infinite loops, the traversal is stopped when\n * the loop limit is reached.\n *\n * @param {Dict} dict - Dictionary from where to start the traversal.\n * @param {string} key - The key of the property to find the value for.\n * @param {boolean} getArray - Whether or not the value should be fetched as an\n *   array. The default value is `false`.\n * @param {boolean} stopWhenFound - Whether or not to stop the traversal when\n *   the key is found. If set to `false`, we always walk up the entire parent\n *   chain, for example to be able to find `\\Resources` placed on multiple\n *   levels of the tree. The default value is `true`.\n */\nfunction getInheritableProperty({ dict, key, getArray = false,\n                                  stopWhenFound = true, }) {\n  const LOOP_LIMIT = 100;\n  let loopCount = 0;\n  let values;\n\n  while (dict) {\n    const value = getArray ? dict.getArray(key) : dict.get(key);\n    if (value !== undefined) {\n      if (stopWhenFound) {\n        return value;\n      }\n      if (!values) {\n        values = [];\n      }\n      values.push(value);\n    }\n    if (++loopCount > LOOP_LIMIT) {\n      warn(`getInheritableProperty: maximum loop count exceeded for \"${key}\"`);\n      break;\n    }\n    dict = dict.get('Parent');\n  }\n  return values;\n}\n\nvar Util = (function UtilClosure() {\n  function Util() {}\n\n  var rgbBuf = ['rgb(', 0, ',', 0, ',', 0, ')'];\n\n  // makeCssRgb() can be called thousands of times. Using |rgbBuf| avoids\n  // creating many intermediate strings.\n  Util.makeCssRgb = function Util_makeCssRgb(r, g, b) {\n    rgbBuf[1] = r;\n    rgbBuf[3] = g;\n    rgbBuf[5] = b;\n    return rgbBuf.join('');\n  };\n\n  // Concatenates two transformation matrices together and returns the result.\n  Util.transform = function Util_transform(m1, m2) {\n    return [\n      m1[0] * m2[0] + m1[2] * m2[1],\n      m1[1] * m2[0] + m1[3] * m2[1],\n      m1[0] * m2[2] + m1[2] * m2[3],\n      m1[1] * m2[2] + m1[3] * m2[3],\n      m1[0] * m2[4] + m1[2] * m2[5] + m1[4],\n      m1[1] * m2[4] + m1[3] * m2[5] + m1[5]\n    ];\n  };\n\n  // For 2d affine transforms\n  Util.applyTransform = function Util_applyTransform(p, m) {\n    var xt = p[0] * m[0] + p[1] * m[2] + m[4];\n    var yt = p[0] * m[1] + p[1] * m[3] + m[5];\n    return [xt, yt];\n  };\n\n  Util.applyInverseTransform = function Util_applyInverseTransform(p, m) {\n    var d = m[0] * m[3] - m[1] * m[2];\n    var xt = (p[0] * m[3] - p[1] * m[2] + m[2] * m[5] - m[4] * m[3]) / d;\n    var yt = (-p[0] * m[1] + p[1] * m[0] + m[4] * m[1] - m[5] * m[0]) / d;\n    return [xt, yt];\n  };\n\n  // Applies the transform to the rectangle and finds the minimum axially\n  // aligned bounding box.\n  Util.getAxialAlignedBoundingBox =\n    function Util_getAxialAlignedBoundingBox(r, m) {\n\n    var p1 = Util.applyTransform(r, m);\n    var p2 = Util.applyTransform(r.slice(2, 4), m);\n    var p3 = Util.applyTransform([r[0], r[3]], m);\n    var p4 = Util.applyTransform([r[2], r[1]], m);\n    return [\n      Math.min(p1[0], p2[0], p3[0], p4[0]),\n      Math.min(p1[1], p2[1], p3[1], p4[1]),\n      Math.max(p1[0], p2[0], p3[0], p4[0]),\n      Math.max(p1[1], p2[1], p3[1], p4[1])\n    ];\n  };\n\n  Util.inverseTransform = function Util_inverseTransform(m) {\n    var d = m[0] * m[3] - m[1] * m[2];\n    return [m[3] / d, -m[1] / d, -m[2] / d, m[0] / d,\n      (m[2] * m[5] - m[4] * m[3]) / d, (m[4] * m[1] - m[5] * m[0]) / d];\n  };\n\n  // Apply a generic 3d matrix M on a 3-vector v:\n  //   | a b c |   | X |\n  //   | d e f | x | Y |\n  //   | g h i |   | Z |\n  // M is assumed to be serialized as [a,b,c,d,e,f,g,h,i],\n  // with v as [X,Y,Z]\n  Util.apply3dTransform = function Util_apply3dTransform(m, v) {\n    return [\n      m[0] * v[0] + m[1] * v[1] + m[2] * v[2],\n      m[3] * v[0] + m[4] * v[1] + m[5] * v[2],\n      m[6] * v[0] + m[7] * v[1] + m[8] * v[2]\n    ];\n  };\n\n  // This calculation uses Singular Value Decomposition.\n  // The SVD can be represented with formula A = USV. We are interested in the\n  // matrix S here because it represents the scale values.\n  Util.singularValueDecompose2dScale =\n    function Util_singularValueDecompose2dScale(m) {\n\n    var transpose = [m[0], m[2], m[1], m[3]];\n\n    // Multiply matrix m with its transpose.\n    var a = m[0] * transpose[0] + m[1] * transpose[2];\n    var b = m[0] * transpose[1] + m[1] * transpose[3];\n    var c = m[2] * transpose[0] + m[3] * transpose[2];\n    var d = m[2] * transpose[1] + m[3] * transpose[3];\n\n    // Solve the second degree polynomial to get roots.\n    var first = (a + d) / 2;\n    var second = Math.sqrt((a + d) * (a + d) - 4 * (a * d - c * b)) / 2;\n    var sx = first + second || 1;\n    var sy = first - second || 1;\n\n    // Scale values are the square roots of the eigenvalues.\n    return [Math.sqrt(sx), Math.sqrt(sy)];\n  };\n\n  // Normalize rectangle rect=[x1, y1, x2, y2] so that (x1,y1) < (x2,y2)\n  // For coordinate systems whose origin lies in the bottom-left, this\n  // means normalization to (BL,TR) ordering. For systems with origin in the\n  // top-left, this means (TL,BR) ordering.\n  Util.normalizeRect = function Util_normalizeRect(rect) {\n    var r = rect.slice(0); // clone rect\n    if (rect[0] > rect[2]) {\n      r[0] = rect[2];\n      r[2] = rect[0];\n    }\n    if (rect[1] > rect[3]) {\n      r[1] = rect[3];\n      r[3] = rect[1];\n    }\n    return r;\n  };\n\n  // Returns a rectangle [x1, y1, x2, y2] corresponding to the\n  // intersection of rect1 and rect2. If no intersection, returns 'false'\n  // The rectangle coordinates of rect1, rect2 should be [x1, y1, x2, y2]\n  Util.intersect = function Util_intersect(rect1, rect2) {\n    function compare(a, b) {\n      return a - b;\n    }\n\n    // Order points along the axes\n    var orderedX = [rect1[0], rect1[2], rect2[0], rect2[2]].sort(compare),\n        orderedY = [rect1[1], rect1[3], rect2[1], rect2[3]].sort(compare),\n        result = [];\n\n    rect1 = Util.normalizeRect(rect1);\n    rect2 = Util.normalizeRect(rect2);\n\n    // X: first and second points belong to different rectangles?\n    if ((orderedX[0] === rect1[0] && orderedX[1] === rect2[0]) ||\n        (orderedX[0] === rect2[0] && orderedX[1] === rect1[0])) {\n      // Intersection must be between second and third points\n      result[0] = orderedX[1];\n      result[2] = orderedX[2];\n    } else {\n      return false;\n    }\n\n    // Y: first and second points belong to different rectangles?\n    if ((orderedY[0] === rect1[1] && orderedY[1] === rect2[1]) ||\n        (orderedY[0] === rect2[1] && orderedY[1] === rect1[1])) {\n      // Intersection must be between second and third points\n      result[1] = orderedY[1];\n      result[3] = orderedY[2];\n    } else {\n      return false;\n    }\n\n    return result;\n  };\n\n  return Util;\n})();\n\nconst ROMAN_NUMBER_MAP = [\n  '', 'C', 'CC', 'CCC', 'CD', 'D', 'DC', 'DCC', 'DCCC', 'CM',\n  '', 'X', 'XX', 'XXX', 'XL', 'L', 'LX', 'LXX', 'LXXX', 'XC',\n  '', 'I', 'II', 'III', 'IV', 'V', 'VI', 'VII', 'VIII', 'IX'\n];\n\n/**\n * Converts positive integers to (upper case) Roman numerals.\n * @param {integer} number - The number that should be converted.\n * @param {boolean} lowerCase - Indicates if the result should be converted\n *   to lower case letters. The default value is `false`.\n * @return {string} The resulting Roman number.\n */\nfunction toRomanNumerals(number, lowerCase = false) {\n  assert(Number.isInteger(number) && number > 0,\n         'The number should be a positive integer.');\n  let pos, romanBuf = [];\n  // Thousands\n  while (number >= 1000) {\n    number -= 1000;\n    romanBuf.push('M');\n  }\n  // Hundreds\n  pos = (number / 100) | 0;\n  number %= 100;\n  romanBuf.push(ROMAN_NUMBER_MAP[pos]);\n  // Tens\n  pos = (number / 10) | 0;\n  number %= 10;\n  romanBuf.push(ROMAN_NUMBER_MAP[10 + pos]);\n  // Ones\n  romanBuf.push(ROMAN_NUMBER_MAP[20 + number]);\n\n  const romanStr = romanBuf.join('');\n  return (lowerCase ? romanStr.toLowerCase() : romanStr);\n}\n\nconst PDFStringTranslateTable = [\n  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n  0x2D8, 0x2C7, 0x2C6, 0x2D9, 0x2DD, 0x2DB, 0x2DA, 0x2DC, 0, 0, 0, 0, 0, 0, 0,\n  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x2022, 0x2020, 0x2021, 0x2026, 0x2014,\n  0x2013, 0x192, 0x2044, 0x2039, 0x203A, 0x2212, 0x2030, 0x201E, 0x201C,\n  0x201D, 0x2018, 0x2019, 0x201A, 0x2122, 0xFB01, 0xFB02, 0x141, 0x152, 0x160,\n  0x178, 0x17D, 0x131, 0x142, 0x153, 0x161, 0x17E, 0, 0x20AC\n];\n\nfunction stringToPDFString(str) {\n  var i, n = str.length, strBuf = [];\n  if (str[0] === '\\xFE' && str[1] === '\\xFF') {\n    // UTF16BE BOM\n    for (i = 2; i < n; i += 2) {\n      strBuf.push(String.fromCharCode(\n        (str.charCodeAt(i) << 8) | str.charCodeAt(i + 1)));\n    }\n  } else {\n    for (i = 0; i < n; ++i) {\n      var code = PDFStringTranslateTable[str.charCodeAt(i)];\n      strBuf.push(code ? String.fromCharCode(code) : str.charAt(i));\n    }\n  }\n  return strBuf.join('');\n}\n\nfunction stringToUTF8String(str) {\n  return decodeURIComponent(escape(str));\n}\n\nfunction utf8StringToString(str) {\n  return unescape(encodeURIComponent(str));\n}\n\nfunction isEmptyObj(obj) {\n  for (var key in obj) {\n    return false;\n  }\n  return true;\n}\n\nfunction isBool(v) {\n  return typeof v === 'boolean';\n}\n\nfunction isNum(v) {\n  return typeof v === 'number';\n}\n\nfunction isString(v) {\n  return typeof v === 'string';\n}\n\nfunction isArrayBuffer(v) {\n  return typeof v === 'object' && v !== null && v.byteLength !== undefined;\n}\n\n// Checks if ch is one of the following characters: SPACE, TAB, CR or LF.\nfunction isSpace(ch) {\n  return (ch === 0x20 || ch === 0x09 || ch === 0x0D || ch === 0x0A);\n}\n\n/**\n * Promise Capability object.\n *\n * @typedef {Object} PromiseCapability\n * @property {Promise} promise - A Promise object.\n * @property {boolean} settled - If the Promise has been fulfilled/rejected.\n * @property {function} resolve - Fulfills the Promise.\n * @property {function} reject - Rejects the Promise.\n */\n\n/**\n * Creates a promise capability object.\n * @alias createPromiseCapability\n *\n * @return {PromiseCapability}\n */\nfunction createPromiseCapability() {\n  const capability = Object.create(null);\n  let isSettled = false;\n\n  Object.defineProperty(capability, 'settled', {\n    get() {\n      return isSettled;\n    },\n  });\n  capability.promise = new Promise(function(resolve, reject) {\n    capability.resolve = function(data) {\n      isSettled = true;\n      resolve(data);\n    };\n    capability.reject = function(reason) {\n      isSettled = true;\n      reject(reason);\n    };\n  });\n  return capability;\n}\n\nvar createObjectURL = (function createObjectURLClosure() {\n  // Blob/createObjectURL is not available, falling back to data schema.\n  var digits =\n    'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';\n\n  return function createObjectURL(data, contentType, forceDataSchema = false) {\n    if (!forceDataSchema && URL.createObjectURL) {\n      const blob = new Blob([data], { type: contentType, });\n      return URL.createObjectURL(blob);\n    }\n\n    var buffer = 'data:' + contentType + ';base64,';\n    for (var i = 0, ii = data.length; i < ii; i += 3) {\n      var b1 = data[i] & 0xFF;\n      var b2 = data[i + 1] & 0xFF;\n      var b3 = data[i + 2] & 0xFF;\n      var d1 = b1 >> 2, d2 = ((b1 & 3) << 4) | (b2 >> 4);\n      var d3 = i + 1 < ii ? ((b2 & 0xF) << 2) | (b3 >> 6) : 64;\n      var d4 = i + 2 < ii ? (b3 & 0x3F) : 64;\n      buffer += digits[d1] + digits[d2] + digits[d3] + digits[d4];\n    }\n    return buffer;\n  };\n})();\n\nexport {\n  FONT_IDENTITY_MATRIX,\n  IDENTITY_MATRIX,\n  OPS,\n  VerbosityLevel,\n  UNSUPPORTED_FEATURES,\n  AnnotationBorderStyleType,\n  AnnotationFieldFlag,\n  AnnotationFlag,\n  AnnotationType,\n  FontType,\n  ImageKind,\n  CMapCompressionType,\n  AbortException,\n  InvalidPDFException,\n  MissingDataException,\n  MissingPDFException,\n  NativeImageDecoding,\n  PasswordException,\n  PasswordResponses,\n  PermissionFlag,\n  StreamType,\n  TextRenderingMode,\n  UnexpectedResponseException,\n  UnknownErrorException,\n  Util,\n  toRomanNumerals,\n  XRefEntryException,\n  XRefParseException,\n  FormatError,\n  arrayByteLength,\n  arraysToBytes,\n  assert,\n  bytesToString,\n  createPromiseCapability,\n  createObjectURL,\n  deprecated,\n  getInheritableProperty,\n  getLookupTableFactory,\n  getVerbosityLevel,\n  info,\n  isArrayBuffer,\n  isBool,\n  isEmptyObj,\n  isNum,\n  isString,\n  isSpace,\n  isSameOrigin,\n  createValidAbsoluteUrl,\n  isLittleEndian,\n  isEvalSupported,\n  log2,\n  readInt8,\n  readUint16,\n  readUint32,\n  removeNullCharacters,\n  ReadableStream,\n  URL,\n  setVerbosityLevel,\n  shadow,\n  string32,\n  stringToBytes,\n  stringToPDFString,\n  stringToUTF8String,\n  utf8StringToString,\n  warn,\n  unreachable,\n};\n","/* Copyright 2017 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nconst globalScope = require('./global_scope');\n\n// Skip compatibility checks for the extensions and if we already ran\n// this module.\nif ((typeof PDFJSDev === 'undefined' ||\n     !PDFJSDev.test('FIREFOX || MOZCENTRAL')) &&\n    !globalScope._pdfjsCompatibilityChecked) {\n\nglobalScope._pdfjsCompatibilityChecked = true;\n\nconst isNodeJS = require('./is_node');\n\nconst hasDOM = typeof window === 'object' && typeof document === 'object';\n\n// Support: Node.js\n(function checkNodeBtoa() {\n  if (globalScope.btoa || !isNodeJS()) {\n    return;\n  }\n  globalScope.btoa = function(chars) {\n    // eslint-disable-next-line no-undef\n    return Buffer.from(chars, 'binary').toString('base64');\n  };\n})();\n\n// Support: Node.js\n(function checkNodeAtob() {\n  if (globalScope.atob || !isNodeJS()) {\n    return;\n  }\n  globalScope.atob = function(input) {\n    // eslint-disable-next-line no-undef\n    return Buffer.from(input, 'base64').toString('binary');\n  };\n})();\n\n// Provides support for ChildNode.remove in legacy browsers.\n// Support: IE.\n(function checkChildNodeRemove() {\n  if (!hasDOM) {\n    return;\n  }\n  if (typeof Element.prototype.remove !== 'undefined') {\n    return;\n  }\n  Element.prototype.remove = function () {\n    if (this.parentNode) {\n      // eslint-disable-next-line mozilla/avoid-removeChild\n      this.parentNode.removeChild(this);\n    }\n  };\n})();\n\n// Provides support for DOMTokenList.prototype.{add, remove}, with more than\n// one parameter, in legacy browsers.\n// Support: IE\n(function checkDOMTokenListAddRemove() {\n  if (!hasDOM || isNodeJS()) {\n    return;\n  }\n  const div = document.createElement('div');\n  div.classList.add('testOne', 'testTwo');\n\n  if (div.classList.contains('testOne') === true &&\n      div.classList.contains('testTwo') === true) {\n    return;\n  }\n  const OriginalDOMTokenListAdd = DOMTokenList.prototype.add;\n  const OriginalDOMTokenListRemove = DOMTokenList.prototype.remove;\n\n  DOMTokenList.prototype.add = function(...tokens) {\n    for (let token of tokens) {\n      OriginalDOMTokenListAdd.call(this, token);\n    }\n  };\n  DOMTokenList.prototype.remove = function(...tokens) {\n    for (let token of tokens) {\n      OriginalDOMTokenListRemove.call(this, token);\n    }\n  };\n})();\n\n// Provides support for DOMTokenList.prototype.toggle, with the optional\n// \"force\" parameter, in legacy browsers.\n// Support: IE\n(function checkDOMTokenListToggle() {\n  if (!hasDOM || isNodeJS()) {\n    return;\n  }\n  const div = document.createElement('div');\n  if (div.classList.toggle('test', 0) === false) {\n    return;\n  }\n\n  DOMTokenList.prototype.toggle = function(token) {\n    let force = (arguments.length > 1 ? !!arguments[1] : !this.contains(token));\n    return (this[force ? 'add' : 'remove'](token), force);\n  };\n})();\n\n// Provides support for String.prototype.startsWith in legacy browsers.\n// Support: IE, Chrome<41\n(function checkStringStartsWith() {\n  if (String.prototype.startsWith) {\n    return;\n  }\n  require('core-js/fn/string/starts-with');\n})();\n\n// Provides support for String.prototype.endsWith in legacy browsers.\n// Support: IE, Chrome<41\n(function checkStringEndsWith() {\n  if (String.prototype.endsWith) {\n    return;\n  }\n  require('core-js/fn/string/ends-with');\n})();\n\n// Provides support for String.prototype.includes in legacy browsers.\n// Support: IE, Chrome<41\n(function checkStringIncludes() {\n  if (String.prototype.includes) {\n    return;\n  }\n  require('core-js/fn/string/includes');\n})();\n\n// Provides support for Array.prototype.includes in legacy browsers.\n// Support: IE, Chrome<47\n(function checkArrayIncludes() {\n  if (Array.prototype.includes) {\n    return;\n  }\n  require('core-js/fn/array/includes');\n})();\n\n// Provides support for Array.from in legacy browsers.\n// Support: IE\n(function checkArrayFrom() {\n  if (Array.from) {\n    return;\n  }\n  require('core-js/fn/array/from');\n})();\n\n// Provides support for Object.assign in legacy browsers.\n// Support: IE\n(function checkObjectAssign() {\n  if (Object.assign) {\n    return;\n  }\n  require('core-js/fn/object/assign');\n})();\n\n// Provides support for Math.log2 in legacy browsers.\n// Support: IE, Chrome<38\n(function checkMathLog2() {\n  if (Math.log2) {\n    return;\n  }\n  Math.log2 = require('core-js/fn/math/log2');\n})();\n\n// Provides support for Number.isNaN in legacy browsers.\n// Support: IE.\n(function checkNumberIsNaN() {\n  if (Number.isNaN) {\n    return;\n  }\n  Number.isNaN = require('core-js/fn/number/is-nan');\n})();\n\n// Provides support for Number.isInteger in legacy browsers.\n// Support: IE, Chrome<34\n(function checkNumberIsInteger() {\n  if (Number.isInteger) {\n    return;\n  }\n  Number.isInteger = require('core-js/fn/number/is-integer');\n})();\n\n// Support: IE, Safari<11, Chrome<63\n(function checkPromise() {\n  if (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('IMAGE_DECODERS')) {\n    // The current image decoders are synchronous, hence `Promise` shouldn't\n    // need to be polyfilled for the IMAGE_DECODERS build target.\n    return;\n  }\n  if (globalScope.Promise && (globalScope.Promise.prototype &&\n                              globalScope.Promise.prototype.finally)) {\n    return;\n  }\n  globalScope.Promise = require('core-js/fn/promise');\n})();\n\n// Support: IE<11, Safari<8, Chrome<36\n(function checkWeakMap() {\n  if (globalScope.WeakMap) {\n    return;\n  }\n  globalScope.WeakMap = require('core-js/fn/weak-map');\n})();\n\n// Support: IE11\n(function checkWeakSet() {\n  if (globalScope.WeakSet) {\n    return;\n  }\n  globalScope.WeakSet = require('core-js/fn/weak-set');\n})();\n\n// Provides support for String.codePointAt in legacy browsers.\n// Support: IE11.\n(function checkStringCodePointAt() {\n  if (String.codePointAt) {\n    return;\n  }\n  String.codePointAt = require('core-js/fn/string/code-point-at');\n})();\n\n// Provides support for String.fromCodePoint in legacy browsers.\n// Support: IE11.\n(function checkStringFromCodePoint() {\n  if (String.fromCodePoint) {\n    return;\n  }\n  String.fromCodePoint = require('core-js/fn/string/from-code-point');\n})();\n\n// Support: IE\n(function checkSymbol() {\n  if (globalScope.Symbol) {\n    return;\n  }\n  require('core-js/es6/symbol');\n})();\n\n// Provides support for String.prototype.padStart in legacy browsers.\n// Support: IE, Chrome<57\n(function checkStringPadStart() {\n  if (String.prototype.padStart) {\n    return;\n  }\n  require('core-js/fn/string/pad-start');\n})();\n\n// Provides support for String.prototype.padEnd in legacy browsers.\n// Support: IE, Chrome<57\n(function checkStringPadEnd() {\n  if (String.prototype.padEnd) {\n    return;\n  }\n  require('core-js/fn/string/pad-end');\n})();\n\n// Provides support for Object.values in legacy browsers.\n// Support: IE, Chrome<54\n(function checkObjectValues() {\n  if (Object.values) {\n    return;\n  }\n  Object.values = require('core-js/fn/object/values');\n})();\n\n}\n","/* Copyright 2017 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n/* globals module */\n\nmodule.exports =\n  (typeof window !== 'undefined' && window.Math === Math) ? window :\n  // eslint-disable-next-line no-undef\n  (typeof global !== 'undefined' && global.Math === Math) ? global :\n  (typeof self !== 'undefined' && self.Math === Math) ? self : {};\n","/* Copyright 2018 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n/* globals module, process */\n\nmodule.exports = function isNodeJS() {\n  // NW.js is a browser context, but copies some Node.js objects; see\n  // http://docs.nwjs.io/en/latest/For%20Users/Advanced/JavaScript%20Contexts%20in%20NW.js/#access-nodejs-and-nwjs-api-in-browser-context\n  return typeof process === 'object' &&\n         process + '' === '[object process]' &&\n         !process.versions['nw'];\n};\n","require('../../modules/es6.string.starts-with');\nmodule.exports = require('../../modules/_core').String.startsWith;\n","// 21.1.3.18 String.prototype.startsWith(searchString [, position ])\n'use strict';\nvar $export = require('./_export');\nvar toLength = require('./_to-length');\nvar context = require('./_string-context');\nvar STARTS_WITH = 'startsWith';\nvar $startsWith = ''[STARTS_WITH];\n\n$export($export.P + $export.F * require('./_fails-is-regexp')(STARTS_WITH), 'String', {\n  startsWith: function startsWith(searchString /* , position = 0 */) {\n    var that = context(this, searchString, STARTS_WITH);\n    var index = toLength(Math.min(arguments.length > 1 ? arguments[1] : undefined, that.length));\n    var search = String(searchString);\n    return $startsWith\n      ? $startsWith.call(that, search, index)\n      : that.slice(index, index + search.length) === search;\n  }\n});\n","var global = require('./_global');\nvar core = require('./_core');\nvar hide = require('./_hide');\nvar redefine = require('./_redefine');\nvar ctx = require('./_ctx');\nvar PROTOTYPE = 'prototype';\n\nvar $export = function (type, name, source) {\n  var IS_FORCED = type & $export.F;\n  var IS_GLOBAL = type & $export.G;\n  var IS_STATIC = type & $export.S;\n  var IS_PROTO = type & $export.P;\n  var IS_BIND = type & $export.B;\n  var target = IS_GLOBAL ? global : IS_STATIC ? global[name] || (global[name] = {}) : (global[name] || {})[PROTOTYPE];\n  var exports = IS_GLOBAL ? core : core[name] || (core[name] = {});\n  var expProto = exports[PROTOTYPE] || (exports[PROTOTYPE] = {});\n  var key, own, out, exp;\n  if (IS_GLOBAL) source = name;\n  for (key in source) {\n    // contains in native\n    own = !IS_FORCED && target && target[key] !== undefined;\n    // export native or passed\n    out = (own ? target : source)[key];\n    // bind timers to global for call from export context\n    exp = IS_BIND && own ? ctx(out, global) : IS_PROTO && typeof out == 'function' ? ctx(Function.call, out) : out;\n    // extend global\n    if (target) redefine(target, key, out, type & $export.U);\n    // export\n    if (exports[key] != out) hide(exports, key, exp);\n    if (IS_PROTO && expProto[key] != out) expProto[key] = out;\n  }\n};\nglobal.core = core;\n// type bitmap\n$export.F = 1;   // forced\n$export.G = 2;   // global\n$export.S = 4;   // static\n$export.P = 8;   // proto\n$export.B = 16;  // bind\n$export.W = 32;  // wrap\n$export.U = 64;  // safe\n$export.R = 128; // real proto method for `library`\nmodule.exports = $export;\n","// https://github.com/zloirock/core-js/issues/86#issuecomment-115759028\nvar global = module.exports = typeof window != 'undefined' && window.Math == Math\n  ? window : typeof self != 'undefined' && self.Math == Math ? self\n  // eslint-disable-next-line no-new-func\n  : Function('return this')();\nif (typeof __g == 'number') __g = global; // eslint-disable-line no-undef\n","var core = module.exports = { version: '2.6.2' };\nif (typeof __e == 'number') __e = core; // eslint-disable-line no-undef\n","var dP = require('./_object-dp');\nvar createDesc = require('./_property-desc');\nmodule.exports = require('./_descriptors') ? function (object, key, value) {\n  return dP.f(object, key, createDesc(1, value));\n} : function (object, key, value) {\n  object[key] = value;\n  return object;\n};\n","var anObject = require('./_an-object');\nvar IE8_DOM_DEFINE = require('./_ie8-dom-define');\nvar toPrimitive = require('./_to-primitive');\nvar dP = Object.defineProperty;\n\nexports.f = require('./_descriptors') ? Object.defineProperty : function defineProperty(O, P, Attributes) {\n  anObject(O);\n  P = toPrimitive(P, true);\n  anObject(Attributes);\n  if (IE8_DOM_DEFINE) try {\n    return dP(O, P, Attributes);\n  } catch (e) { /* empty */ }\n  if ('get' in Attributes || 'set' in Attributes) throw TypeError('Accessors not supported!');\n  if ('value' in Attributes) O[P] = Attributes.value;\n  return O;\n};\n","var isObject = require('./_is-object');\nmodule.exports = function (it) {\n  if (!isObject(it)) throw TypeError(it + ' is not an object!');\n  return it;\n};\n","module.exports = function (it) {\n  return typeof it === 'object' ? it !== null : typeof it === 'function';\n};\n","module.exports = !require('./_descriptors') && !require('./_fails')(function () {\n  return Object.defineProperty(require('./_dom-create')('div'), 'a', { get: function () { return 7; } }).a != 7;\n});\n","// Thank's IE8 for his funny defineProperty\nmodule.exports = !require('./_fails')(function () {\n  return Object.defineProperty({}, 'a', { get: function () { return 7; } }).a != 7;\n});\n","module.exports = function (exec) {\n  try {\n    return !!exec();\n  } catch (e) {\n    return true;\n  }\n};\n","var isObject = require('./_is-object');\nvar document = require('./_global').document;\n// typeof document.createElement is 'object' in old IE\nvar is = isObject(document) && isObject(document.createElement);\nmodule.exports = function (it) {\n  return is ? document.createElement(it) : {};\n};\n","// 7.1.1 ToPrimitive(input [, PreferredType])\nvar isObject = require('./_is-object');\n// instead of the ES6 spec version, we didn't implement @@toPrimitive case\n// and the second argument - flag - preferred type is a string\nmodule.exports = function (it, S) {\n  if (!isObject(it)) return it;\n  var fn, val;\n  if (S && typeof (fn = it.toString) == 'function' && !isObject(val = fn.call(it))) return val;\n  if (typeof (fn = it.valueOf) == 'function' && !isObject(val = fn.call(it))) return val;\n  if (!S && typeof (fn = it.toString) == 'function' && !isObject(val = fn.call(it))) return val;\n  throw TypeError(\"Can't convert object to primitive value\");\n};\n","module.exports = function (bitmap, value) {\n  return {\n    enumerable: !(bitmap & 1),\n    configurable: !(bitmap & 2),\n    writable: !(bitmap & 4),\n    value: value\n  };\n};\n","var global = require('./_global');\nvar hide = require('./_hide');\nvar has = require('./_has');\nvar SRC = require('./_uid')('src');\nvar TO_STRING = 'toString';\nvar $toString = Function[TO_STRING];\nvar TPL = ('' + $toString).split(TO_STRING);\n\nrequire('./_core').inspectSource = function (it) {\n  return $toString.call(it);\n};\n\n(module.exports = function (O, key, val, safe) {\n  var isFunction = typeof val == 'function';\n  if (isFunction) has(val, 'name') || hide(val, 'name', key);\n  if (O[key] === val) return;\n  if (isFunction) has(val, SRC) || hide(val, SRC, O[key] ? '' + O[key] : TPL.join(String(key)));\n  if (O === global) {\n    O[key] = val;\n  } else if (!safe) {\n    delete O[key];\n    hide(O, key, val);\n  } else if (O[key]) {\n    O[key] = val;\n  } else {\n    hide(O, key, val);\n  }\n// add fake Function#toString for correct work wrapped methods / constructors with methods like LoDash isNative\n})(Function.prototype, TO_STRING, function toString() {\n  return typeof this == 'function' && this[SRC] || $toString.call(this);\n});\n","var hasOwnProperty = {}.hasOwnProperty;\nmodule.exports = function (it, key) {\n  return hasOwnProperty.call(it, key);\n};\n","var id = 0;\nvar px = Math.random();\nmodule.exports = function (key) {\n  return 'Symbol('.concat(key === undefined ? '' : key, ')_', (++id + px).toString(36));\n};\n","// optional / simple context binding\nvar aFunction = require('./_a-function');\nmodule.exports = function (fn, that, length) {\n  aFunction(fn);\n  if (that === undefined) return fn;\n  switch (length) {\n    case 1: return function (a) {\n      return fn.call(that, a);\n    };\n    case 2: return function (a, b) {\n      return fn.call(that, a, b);\n    };\n    case 3: return function (a, b, c) {\n      return fn.call(that, a, b, c);\n    };\n  }\n  return function (/* ...args */) {\n    return fn.apply(that, arguments);\n  };\n};\n","module.exports = function (it) {\n  if (typeof it != 'function') throw TypeError(it + ' is not a function!');\n  return it;\n};\n","// 7.1.15 ToLength\nvar toInteger = require('./_to-integer');\nvar min = Math.min;\nmodule.exports = function (it) {\n  return it > 0 ? min(toInteger(it), 0x1fffffffffffff) : 0; // pow(2, 53) - 1 == 9007199254740991\n};\n","// 7.1.4 ToInteger\nvar ceil = Math.ceil;\nvar floor = Math.floor;\nmodule.exports = function (it) {\n  return isNaN(it = +it) ? 0 : (it > 0 ? floor : ceil)(it);\n};\n","// helper for String#{startsWith, endsWith, includes}\nvar isRegExp = require('./_is-regexp');\nvar defined = require('./_defined');\n\nmodule.exports = function (that, searchString, NAME) {\n  if (isRegExp(searchString)) throw TypeError('String#' + NAME + \" doesn't accept regex!\");\n  return String(defined(that));\n};\n","// 7.2.8 IsRegExp(argument)\nvar isObject = require('./_is-object');\nvar cof = require('./_cof');\nvar MATCH = require('./_wks')('match');\nmodule.exports = function (it) {\n  var isRegExp;\n  return isObject(it) && ((isRegExp = it[MATCH]) !== undefined ? !!isRegExp : cof(it) == 'RegExp');\n};\n","var toString = {}.toString;\n\nmodule.exports = function (it) {\n  return toString.call(it).slice(8, -1);\n};\n","var store = require('./_shared')('wks');\nvar uid = require('./_uid');\nvar Symbol = require('./_global').Symbol;\nvar USE_SYMBOL = typeof Symbol == 'function';\n\nvar $exports = module.exports = function (name) {\n  return store[name] || (store[name] =\n    USE_SYMBOL && Symbol[name] || (USE_SYMBOL ? Symbol : uid)('Symbol.' + name));\n};\n\n$exports.store = store;\n","var core = require('./_core');\nvar global = require('./_global');\nvar SHARED = '__core-js_shared__';\nvar store = global[SHARED] || (global[SHARED] = {});\n\n(module.exports = function (key, value) {\n  return store[key] || (store[key] = value !== undefined ? value : {});\n})('versions', []).push({\n  version: core.version,\n  mode: require('./_library') ? 'pure' : 'global',\n  copyright: '© 2019 Denis Pushkarev (zloirock.ru)'\n});\n","module.exports = false;\n","// 7.2.1 RequireObjectCoercible(argument)\nmodule.exports = function (it) {\n  if (it == undefined) throw TypeError(\"Can't call method on  \" + it);\n  return it;\n};\n","var MATCH = require('./_wks')('match');\nmodule.exports = function (KEY) {\n  var re = /./;\n  try {\n    '/./'[KEY](re);\n  } catch (e) {\n    try {\n      re[MATCH] = false;\n      return !'/./'[KEY](re);\n    } catch (f) { /* empty */ }\n  } return true;\n};\n","require('../../modules/es6.string.ends-with');\nmodule.exports = require('../../modules/_core').String.endsWith;\n","// 21.1.3.6 String.prototype.endsWith(searchString [, endPosition])\n'use strict';\nvar $export = require('./_export');\nvar toLength = require('./_to-length');\nvar context = require('./_string-context');\nvar ENDS_WITH = 'endsWith';\nvar $endsWith = ''[ENDS_WITH];\n\n$export($export.P + $export.F * require('./_fails-is-regexp')(ENDS_WITH), 'String', {\n  endsWith: function endsWith(searchString /* , endPosition = @length */) {\n    var that = context(this, searchString, ENDS_WITH);\n    var endPosition = arguments.length > 1 ? arguments[1] : undefined;\n    var len = toLength(that.length);\n    var end = endPosition === undefined ? len : Math.min(toLength(endPosition), len);\n    var search = String(searchString);\n    return $endsWith\n      ? $endsWith.call(that, search, end)\n      : that.slice(end - search.length, end) === search;\n  }\n});\n","require('../../modules/es6.string.includes');\nmodule.exports = require('../../modules/_core').String.includes;\n","// 21.1.3.7 String.prototype.includes(searchString, position = 0)\n'use strict';\nvar $export = require('./_export');\nvar context = require('./_string-context');\nvar INCLUDES = 'includes';\n\n$export($export.P + $export.F * require('./_fails-is-regexp')(INCLUDES), 'String', {\n  includes: function includes(searchString /* , position = 0 */) {\n    return !!~context(this, searchString, INCLUDES)\n      .indexOf(searchString, arguments.length > 1 ? arguments[1] : undefined);\n  }\n});\n","require('../../modules/es7.array.includes');\nmodule.exports = require('../../modules/_core').Array.includes;\n","'use strict';\n// https://github.com/tc39/Array.prototype.includes\nvar $export = require('./_export');\nvar $includes = require('./_array-includes')(true);\n\n$export($export.P, 'Array', {\n  includes: function includes(el /* , fromIndex = 0 */) {\n    return $includes(this, el, arguments.length > 1 ? arguments[1] : undefined);\n  }\n});\n\nrequire('./_add-to-unscopables')('includes');\n","// false -> Array#indexOf\n// true  -> Array#includes\nvar toIObject = require('./_to-iobject');\nvar toLength = require('./_to-length');\nvar toAbsoluteIndex = require('./_to-absolute-index');\nmodule.exports = function (IS_INCLUDES) {\n  return function ($this, el, fromIndex) {\n    var O = toIObject($this);\n    var length = toLength(O.length);\n    var index = toAbsoluteIndex(fromIndex, length);\n    var value;\n    // Array#includes uses SameValueZero equality algorithm\n    // eslint-disable-next-line no-self-compare\n    if (IS_INCLUDES && el != el) while (length > index) {\n      value = O[index++];\n      // eslint-disable-next-line no-self-compare\n      if (value != value) return true;\n    // Array#indexOf ignores holes, Array#includes - not\n    } else for (;length > index; index++) if (IS_INCLUDES || index in O) {\n      if (O[index] === el) return IS_INCLUDES || index || 0;\n    } return !IS_INCLUDES && -1;\n  };\n};\n","// to indexed object, toObject with fallback for non-array-like ES3 strings\nvar IObject = require('./_iobject');\nvar defined = require('./_defined');\nmodule.exports = function (it) {\n  return IObject(defined(it));\n};\n","// fallback for non-array-like ES3 and non-enumerable old V8 strings\nvar cof = require('./_cof');\n// eslint-disable-next-line no-prototype-builtins\nmodule.exports = Object('z').propertyIsEnumerable(0) ? Object : function (it) {\n  return cof(it) == 'String' ? it.split('') : Object(it);\n};\n","var toInteger = require('./_to-integer');\nvar max = Math.max;\nvar min = Math.min;\nmodule.exports = function (index, length) {\n  index = toInteger(index);\n  return index < 0 ? max(index + length, 0) : min(index, length);\n};\n","// 22.1.3.31 Array.prototype[@@unscopables]\nvar UNSCOPABLES = require('./_wks')('unscopables');\nvar ArrayProto = Array.prototype;\nif (ArrayProto[UNSCOPABLES] == undefined) require('./_hide')(ArrayProto, UNSCOPABLES, {});\nmodule.exports = function (key) {\n  ArrayProto[UNSCOPABLES][key] = true;\n};\n","require('../../modules/es6.string.iterator');\nrequire('../../modules/es6.array.from');\nmodule.exports = require('../../modules/_core').Array.from;\n","'use strict';\nvar $at = require('./_string-at')(true);\n\n// 21.1.3.27 String.prototype[@@iterator]()\nrequire('./_iter-define')(String, 'String', function (iterated) {\n  this._t = String(iterated); // target\n  this._i = 0;                // next index\n// 21.1.5.2.1 %StringIteratorPrototype%.next()\n}, function () {\n  var O = this._t;\n  var index = this._i;\n  var point;\n  if (index >= O.length) return { value: undefined, done: true };\n  point = $at(O, index);\n  this._i += point.length;\n  return { value: point, done: false };\n});\n","var toInteger = require('./_to-integer');\nvar defined = require('./_defined');\n// true  -> String#at\n// false -> String#codePointAt\nmodule.exports = function (TO_STRING) {\n  return function (that, pos) {\n    var s = String(defined(that));\n    var i = toInteger(pos);\n    var l = s.length;\n    var a, b;\n    if (i < 0 || i >= l) return TO_STRING ? '' : undefined;\n    a = s.charCodeAt(i);\n    return a < 0xd800 || a > 0xdbff || i + 1 === l || (b = s.charCodeAt(i + 1)) < 0xdc00 || b > 0xdfff\n      ? TO_STRING ? s.charAt(i) : a\n      : TO_STRING ? s.slice(i, i + 2) : (a - 0xd800 << 10) + (b - 0xdc00) + 0x10000;\n  };\n};\n","'use strict';\nvar LIBRARY = require('./_library');\nvar $export = require('./_export');\nvar redefine = require('./_redefine');\nvar hide = require('./_hide');\nvar Iterators = require('./_iterators');\nvar $iterCreate = require('./_iter-create');\nvar setToStringTag = require('./_set-to-string-tag');\nvar getPrototypeOf = require('./_object-gpo');\nvar ITERATOR = require('./_wks')('iterator');\nvar BUGGY = !([].keys && 'next' in [].keys()); // Safari has buggy iterators w/o `next`\nvar FF_ITERATOR = '@@iterator';\nvar KEYS = 'keys';\nvar VALUES = 'values';\n\nvar returnThis = function () { return this; };\n\nmodule.exports = function (Base, NAME, Constructor, next, DEFAULT, IS_SET, FORCED) {\n  $iterCreate(Constructor, NAME, next);\n  var getMethod = function (kind) {\n    if (!BUGGY && kind in proto) return proto[kind];\n    switch (kind) {\n      case KEYS: return function keys() { return new Constructor(this, kind); };\n      case VALUES: return function values() { return new Constructor(this, kind); };\n    } return function entries() { return new Constructor(this, kind); };\n  };\n  var TAG = NAME + ' Iterator';\n  var DEF_VALUES = DEFAULT == VALUES;\n  var VALUES_BUG = false;\n  var proto = Base.prototype;\n  var $native = proto[ITERATOR] || proto[FF_ITERATOR] || DEFAULT && proto[DEFAULT];\n  var $default = $native || getMethod(DEFAULT);\n  var $entries = DEFAULT ? !DEF_VALUES ? $default : getMethod('entries') : undefined;\n  var $anyNative = NAME == 'Array' ? proto.entries || $native : $native;\n  var methods, key, IteratorPrototype;\n  // Fix native\n  if ($anyNative) {\n    IteratorPrototype = getPrototypeOf($anyNative.call(new Base()));\n    if (IteratorPrototype !== Object.prototype && IteratorPrototype.next) {\n      // Set @@toStringTag to native iterators\n      setToStringTag(IteratorPrototype, TAG, true);\n      // fix for some old engines\n      if (!LIBRARY && typeof IteratorPrototype[ITERATOR] != 'function') hide(IteratorPrototype, ITERATOR, returnThis);\n    }\n  }\n  // fix Array#{values, @@iterator}.name in V8 / FF\n  if (DEF_VALUES && $native && $native.name !== VALUES) {\n    VALUES_BUG = true;\n    $default = function values() { return $native.call(this); };\n  }\n  // Define iterator\n  if ((!LIBRARY || FORCED) && (BUGGY || VALUES_BUG || !proto[ITERATOR])) {\n    hide(proto, ITERATOR, $default);\n  }\n  // Plug for library\n  Iterators[NAME] = $default;\n  Iterators[TAG] = returnThis;\n  if (DEFAULT) {\n    methods = {\n      values: DEF_VALUES ? $default : getMethod(VALUES),\n      keys: IS_SET ? $default : getMethod(KEYS),\n      entries: $entries\n    };\n    if (FORCED) for (key in methods) {\n      if (!(key in proto)) redefine(proto, key, methods[key]);\n    } else $export($export.P + $export.F * (BUGGY || VALUES_BUG), NAME, methods);\n  }\n  return methods;\n};\n","module.exports = {};\n","'use strict';\nvar create = require('./_object-create');\nvar descriptor = require('./_property-desc');\nvar setToStringTag = require('./_set-to-string-tag');\nvar IteratorPrototype = {};\n\n// 25.1.2.1.1 %IteratorPrototype%[@@iterator]()\nrequire('./_hide')(IteratorPrototype, require('./_wks')('iterator'), function () { return this; });\n\nmodule.exports = function (Constructor, NAME, next) {\n  Constructor.prototype = create(IteratorPrototype, { next: descriptor(1, next) });\n  setToStringTag(Constructor, NAME + ' Iterator');\n};\n","// 19.1.2.2 / 15.2.3.5 Object.create(O [, Properties])\nvar anObject = require('./_an-object');\nvar dPs = require('./_object-dps');\nvar enumBugKeys = require('./_enum-bug-keys');\nvar IE_PROTO = require('./_shared-key')('IE_PROTO');\nvar Empty = function () { /* empty */ };\nvar PROTOTYPE = 'prototype';\n\n// Create object with fake `null` prototype: use iframe Object with cleared prototype\nvar createDict = function () {\n  // Thrash, waste and sodomy: IE GC bug\n  var iframe = require('./_dom-create')('iframe');\n  var i = enumBugKeys.length;\n  var lt = '<';\n  var gt = '>';\n  var iframeDocument;\n  iframe.style.display = 'none';\n  require('./_html').appendChild(iframe);\n  iframe.src = 'javascript:'; // eslint-disable-line no-script-url\n  // createDict = iframe.contentWindow.Object;\n  // html.removeChild(iframe);\n  iframeDocument = iframe.contentWindow.document;\n  iframeDocument.open();\n  iframeDocument.write(lt + 'script' + gt + 'document.F=Object' + lt + '/script' + gt);\n  iframeDocument.close();\n  createDict = iframeDocument.F;\n  while (i--) delete createDict[PROTOTYPE][enumBugKeys[i]];\n  return createDict();\n};\n\nmodule.exports = Object.create || function create(O, Properties) {\n  var result;\n  if (O !== null) {\n    Empty[PROTOTYPE] = anObject(O);\n    result = new Empty();\n    Empty[PROTOTYPE] = null;\n    // add \"__proto__\" for Object.getPrototypeOf polyfill\n    result[IE_PROTO] = O;\n  } else result = createDict();\n  return Properties === undefined ? result : dPs(result, Properties);\n};\n","var dP = require('./_object-dp');\nvar anObject = require('./_an-object');\nvar getKeys = require('./_object-keys');\n\nmodule.exports = require('./_descriptors') ? Object.defineProperties : function defineProperties(O, Properties) {\n  anObject(O);\n  var keys = getKeys(Properties);\n  var length = keys.length;\n  var i = 0;\n  var P;\n  while (length > i) dP.f(O, P = keys[i++], Properties[P]);\n  return O;\n};\n","// 19.1.2.14 / 15.2.3.14 Object.keys(O)\nvar $keys = require('./_object-keys-internal');\nvar enumBugKeys = require('./_enum-bug-keys');\n\nmodule.exports = Object.keys || function keys(O) {\n  return $keys(O, enumBugKeys);\n};\n","var has = require('./_has');\nvar toIObject = require('./_to-iobject');\nvar arrayIndexOf = require('./_array-includes')(false);\nvar IE_PROTO = require('./_shared-key')('IE_PROTO');\n\nmodule.exports = function (object, names) {\n  var O = toIObject(object);\n  var i = 0;\n  var result = [];\n  var key;\n  for (key in O) if (key != IE_PROTO) has(O, key) && result.push(key);\n  // Don't enum bug & hidden keys\n  while (names.length > i) if (has(O, key = names[i++])) {\n    ~arrayIndexOf(result, key) || result.push(key);\n  }\n  return result;\n};\n","var shared = require('./_shared')('keys');\nvar uid = require('./_uid');\nmodule.exports = function (key) {\n  return shared[key] || (shared[key] = uid(key));\n};\n","// IE 8- don't enum bug keys\nmodule.exports = (\n  'constructor,hasOwnProperty,isPrototypeOf,propertyIsEnumerable,toLocaleString,toString,valueOf'\n).split(',');\n","var document = require('./_global').document;\nmodule.exports = document && document.documentElement;\n","var def = require('./_object-dp').f;\nvar has = require('./_has');\nvar TAG = require('./_wks')('toStringTag');\n\nmodule.exports = function (it, tag, stat) {\n  if (it && !has(it = stat ? it : it.prototype, TAG)) def(it, TAG, { configurable: true, value: tag });\n};\n","// 19.1.2.9 / 15.2.3.2 Object.getPrototypeOf(O)\nvar has = require('./_has');\nvar toObject = require('./_to-object');\nvar IE_PROTO = require('./_shared-key')('IE_PROTO');\nvar ObjectProto = Object.prototype;\n\nmodule.exports = Object.getPrototypeOf || function (O) {\n  O = toObject(O);\n  if (has(O, IE_PROTO)) return O[IE_PROTO];\n  if (typeof O.constructor == 'function' && O instanceof O.constructor) {\n    return O.constructor.prototype;\n  } return O instanceof Object ? ObjectProto : null;\n};\n","// 7.1.13 ToObject(argument)\nvar defined = require('./_defined');\nmodule.exports = function (it) {\n  return Object(defined(it));\n};\n","'use strict';\nvar ctx = require('./_ctx');\nvar $export = require('./_export');\nvar toObject = require('./_to-object');\nvar call = require('./_iter-call');\nvar isArrayIter = require('./_is-array-iter');\nvar toLength = require('./_to-length');\nvar createProperty = require('./_create-property');\nvar getIterFn = require('./core.get-iterator-method');\n\n$export($export.S + $export.F * !require('./_iter-detect')(function (iter) { Array.from(iter); }), 'Array', {\n  // 22.1.2.1 Array.from(arrayLike, mapfn = undefined, thisArg = undefined)\n  from: function from(arrayLike /* , mapfn = undefined, thisArg = undefined */) {\n    var O = toObject(arrayLike);\n    var C = typeof this == 'function' ? this : Array;\n    var aLen = arguments.length;\n    var mapfn = aLen > 1 ? arguments[1] : undefined;\n    var mapping = mapfn !== undefined;\n    var index = 0;\n    var iterFn = getIterFn(O);\n    var length, result, step, iterator;\n    if (mapping) mapfn = ctx(mapfn, aLen > 2 ? arguments[2] : undefined, 2);\n    // if object isn't iterable or it's array with default iterator - use simple case\n    if (iterFn != undefined && !(C == Array && isArrayIter(iterFn))) {\n      for (iterator = iterFn.call(O), result = new C(); !(step = iterator.next()).done; index++) {\n        createProperty(result, index, mapping ? call(iterator, mapfn, [step.value, index], true) : step.value);\n      }\n    } else {\n      length = toLength(O.length);\n      for (result = new C(length); length > index; index++) {\n        createProperty(result, index, mapping ? mapfn(O[index], index) : O[index]);\n      }\n    }\n    result.length = index;\n    return result;\n  }\n});\n","// call something on iterator step with safe closing on error\nvar anObject = require('./_an-object');\nmodule.exports = function (iterator, fn, value, entries) {\n  try {\n    return entries ? fn(anObject(value)[0], value[1]) : fn(value);\n  // 7.4.6 IteratorClose(iterator, completion)\n  } catch (e) {\n    var ret = iterator['return'];\n    if (ret !== undefined) anObject(ret.call(iterator));\n    throw e;\n  }\n};\n","// check on default Array iterator\nvar Iterators = require('./_iterators');\nvar ITERATOR = require('./_wks')('iterator');\nvar ArrayProto = Array.prototype;\n\nmodule.exports = function (it) {\n  return it !== undefined && (Iterators.Array === it || ArrayProto[ITERATOR] === it);\n};\n","'use strict';\nvar $defineProperty = require('./_object-dp');\nvar createDesc = require('./_property-desc');\n\nmodule.exports = function (object, index, value) {\n  if (index in object) $defineProperty.f(object, index, createDesc(0, value));\n  else object[index] = value;\n};\n","var classof = require('./_classof');\nvar ITERATOR = require('./_wks')('iterator');\nvar Iterators = require('./_iterators');\nmodule.exports = require('./_core').getIteratorMethod = function (it) {\n  if (it != undefined) return it[ITERATOR]\n    || it['@@iterator']\n    || Iterators[classof(it)];\n};\n","// getting tag from 19.1.3.6 Object.prototype.toString()\nvar cof = require('./_cof');\nvar TAG = require('./_wks')('toStringTag');\n// ES3 wrong here\nvar ARG = cof(function () { return arguments; }()) == 'Arguments';\n\n// fallback for IE11 Script Access Denied error\nvar tryGet = function (it, key) {\n  try {\n    return it[key];\n  } catch (e) { /* empty */ }\n};\n\nmodule.exports = function (it) {\n  var O, T, B;\n  return it === undefined ? 'Undefined' : it === null ? 'Null'\n    // @@toStringTag case\n    : typeof (T = tryGet(O = Object(it), TAG)) == 'string' ? T\n    // builtinTag case\n    : ARG ? cof(O)\n    // ES3 arguments fallback\n    : (B = cof(O)) == 'Object' && typeof O.callee == 'function' ? 'Arguments' : B;\n};\n","var ITERATOR = require('./_wks')('iterator');\nvar SAFE_CLOSING = false;\n\ntry {\n  var riter = [7][ITERATOR]();\n  riter['return'] = function () { SAFE_CLOSING = true; };\n  // eslint-disable-next-line no-throw-literal\n  Array.from(riter, function () { throw 2; });\n} catch (e) { /* empty */ }\n\nmodule.exports = function (exec, skipClosing) {\n  if (!skipClosing && !SAFE_CLOSING) return false;\n  var safe = false;\n  try {\n    var arr = [7];\n    var iter = arr[ITERATOR]();\n    iter.next = function () { return { done: safe = true }; };\n    arr[ITERATOR] = function () { return iter; };\n    exec(arr);\n  } catch (e) { /* empty */ }\n  return safe;\n};\n","require('../../modules/es6.object.assign');\nmodule.exports = require('../../modules/_core').Object.assign;\n","// 19.1.3.1 Object.assign(target, source)\nvar $export = require('./_export');\n\n$export($export.S + $export.F, 'Object', { assign: require('./_object-assign') });\n","'use strict';\n// 19.1.2.1 Object.assign(target, source, ...)\nvar getKeys = require('./_object-keys');\nvar gOPS = require('./_object-gops');\nvar pIE = require('./_object-pie');\nvar toObject = require('./_to-object');\nvar IObject = require('./_iobject');\nvar $assign = Object.assign;\n\n// should work with symbols and should have deterministic property order (V8 bug)\nmodule.exports = !$assign || require('./_fails')(function () {\n  var A = {};\n  var B = {};\n  // eslint-disable-next-line no-undef\n  var S = Symbol();\n  var K = 'abcdefghijklmnopqrst';\n  A[S] = 7;\n  K.split('').forEach(function (k) { B[k] = k; });\n  return $assign({}, A)[S] != 7 || Object.keys($assign({}, B)).join('') != K;\n}) ? function assign(target, source) { // eslint-disable-line no-unused-vars\n  var T = toObject(target);\n  var aLen = arguments.length;\n  var index = 1;\n  var getSymbols = gOPS.f;\n  var isEnum = pIE.f;\n  while (aLen > index) {\n    var S = IObject(arguments[index++]);\n    var keys = getSymbols ? getKeys(S).concat(getSymbols(S)) : getKeys(S);\n    var length = keys.length;\n    var j = 0;\n    var key;\n    while (length > j) if (isEnum.call(S, key = keys[j++])) T[key] = S[key];\n  } return T;\n} : $assign;\n","exports.f = Object.getOwnPropertySymbols;\n","exports.f = {}.propertyIsEnumerable;\n","require('../../modules/es6.math.log2');\nmodule.exports = require('../../modules/_core').Math.log2;\n","// 20.2.2.22 Math.log2(x)\nvar $export = require('./_export');\n\n$export($export.S, 'Math', {\n  log2: function log2(x) {\n    return Math.log(x) / Math.LN2;\n  }\n});\n","require('../../modules/es6.number.is-nan');\nmodule.exports = require('../../modules/_core').Number.isNaN;\n","// 20.1.2.4 Number.isNaN(number)\nvar $export = require('./_export');\n\n$export($export.S, 'Number', {\n  isNaN: function isNaN(number) {\n    // eslint-disable-next-line no-self-compare\n    return number != number;\n  }\n});\n","require('../../modules/es6.number.is-integer');\nmodule.exports = require('../../modules/_core').Number.isInteger;\n","// 20.1.2.3 Number.isInteger(number)\nvar $export = require('./_export');\n\n$export($export.S, 'Number', { isInteger: require('./_is-integer') });\n","// 20.1.2.3 Number.isInteger(number)\nvar isObject = require('./_is-object');\nvar floor = Math.floor;\nmodule.exports = function isInteger(it) {\n  return !isObject(it) && isFinite(it) && floor(it) === it;\n};\n","require('../modules/es6.object.to-string');\nrequire('../modules/es6.string.iterator');\nrequire('../modules/web.dom.iterable');\nrequire('../modules/es6.promise');\nrequire('../modules/es7.promise.finally');\nrequire('../modules/es7.promise.try');\nmodule.exports = require('../modules/_core').Promise;\n","'use strict';\n// 19.1.3.6 Object.prototype.toString()\nvar classof = require('./_classof');\nvar test = {};\ntest[require('./_wks')('toStringTag')] = 'z';\nif (test + '' != '[object z]') {\n  require('./_redefine')(Object.prototype, 'toString', function toString() {\n    return '[object ' + classof(this) + ']';\n  }, true);\n}\n","var $iterators = require('./es6.array.iterator');\nvar getKeys = require('./_object-keys');\nvar redefine = require('./_redefine');\nvar global = require('./_global');\nvar hide = require('./_hide');\nvar Iterators = require('./_iterators');\nvar wks = require('./_wks');\nvar ITERATOR = wks('iterator');\nvar TO_STRING_TAG = wks('toStringTag');\nvar ArrayValues = Iterators.Array;\n\nvar DOMIterables = {\n  CSSRuleList: true, // TODO: Not spec compliant, should be false.\n  CSSStyleDeclaration: false,\n  CSSValueList: false,\n  ClientRectList: false,\n  DOMRectList: false,\n  DOMStringList: false,\n  DOMTokenList: true,\n  DataTransferItemList: false,\n  FileList: false,\n  HTMLAllCollection: false,\n  HTMLCollection: false,\n  HTMLFormElement: false,\n  HTMLSelectElement: false,\n  MediaList: true, // TODO: Not spec compliant, should be false.\n  MimeTypeArray: false,\n  NamedNodeMap: false,\n  NodeList: true,\n  PaintRequestList: false,\n  Plugin: false,\n  PluginArray: false,\n  SVGLengthList: false,\n  SVGNumberList: false,\n  SVGPathSegList: false,\n  SVGPointList: false,\n  SVGStringList: false,\n  SVGTransformList: false,\n  SourceBufferList: false,\n  StyleSheetList: true, // TODO: Not spec compliant, should be false.\n  TextTrackCueList: false,\n  TextTrackList: false,\n  TouchList: false\n};\n\nfor (var collections = getKeys(DOMIterables), i = 0; i < collections.length; i++) {\n  var NAME = collections[i];\n  var explicit = DOMIterables[NAME];\n  var Collection = global[NAME];\n  var proto = Collection && Collection.prototype;\n  var key;\n  if (proto) {\n    if (!proto[ITERATOR]) hide(proto, ITERATOR, ArrayValues);\n    if (!proto[TO_STRING_TAG]) hide(proto, TO_STRING_TAG, NAME);\n    Iterators[NAME] = ArrayValues;\n    if (explicit) for (key in $iterators) if (!proto[key]) redefine(proto, key, $iterators[key], true);\n  }\n}\n","'use strict';\nvar addToUnscopables = require('./_add-to-unscopables');\nvar step = require('./_iter-step');\nvar Iterators = require('./_iterators');\nvar toIObject = require('./_to-iobject');\n\n// 22.1.3.4 Array.prototype.entries()\n// 22.1.3.13 Array.prototype.keys()\n// 22.1.3.29 Array.prototype.values()\n// 22.1.3.30 Array.prototype[@@iterator]()\nmodule.exports = require('./_iter-define')(Array, 'Array', function (iterated, kind) {\n  this._t = toIObject(iterated); // target\n  this._i = 0;                   // next index\n  this._k = kind;                // kind\n// 22.1.5.2.1 %ArrayIteratorPrototype%.next()\n}, function () {\n  var O = this._t;\n  var kind = this._k;\n  var index = this._i++;\n  if (!O || index >= O.length) {\n    this._t = undefined;\n    return step(1);\n  }\n  if (kind == 'keys') return step(0, index);\n  if (kind == 'values') return step(0, O[index]);\n  return step(0, [index, O[index]]);\n}, 'values');\n\n// argumentsList[@@iterator] is %ArrayProto_values% (9.4.4.6, 9.4.4.7)\nIterators.Arguments = Iterators.Array;\n\naddToUnscopables('keys');\naddToUnscopables('values');\naddToUnscopables('entries');\n","module.exports = function (done, value) {\n  return { value: value, done: !!done };\n};\n","'use strict';\nvar LIBRARY = require('./_library');\nvar global = require('./_global');\nvar ctx = require('./_ctx');\nvar classof = require('./_classof');\nvar $export = require('./_export');\nvar isObject = require('./_is-object');\nvar aFunction = require('./_a-function');\nvar anInstance = require('./_an-instance');\nvar forOf = require('./_for-of');\nvar speciesConstructor = require('./_species-constructor');\nvar task = require('./_task').set;\nvar microtask = require('./_microtask')();\nvar newPromiseCapabilityModule = require('./_new-promise-capability');\nvar perform = require('./_perform');\nvar userAgent = require('./_user-agent');\nvar promiseResolve = require('./_promise-resolve');\nvar PROMISE = 'Promise';\nvar TypeError = global.TypeError;\nvar process = global.process;\nvar versions = process && process.versions;\nvar v8 = versions && versions.v8 || '';\nvar $Promise = global[PROMISE];\nvar isNode = classof(process) == 'process';\nvar empty = function () { /* empty */ };\nvar Internal, newGenericPromiseCapability, OwnPromiseCapability, Wrapper;\nvar newPromiseCapability = newGenericPromiseCapability = newPromiseCapabilityModule.f;\n\nvar USE_NATIVE = !!function () {\n  try {\n    // correct subclassing with @@species support\n    var promise = $Promise.resolve(1);\n    var FakePromise = (promise.constructor = {})[require('./_wks')('species')] = function (exec) {\n      exec(empty, empty);\n    };\n    // unhandled rejections tracking support, NodeJS Promise without it fails @@species test\n    return (isNode || typeof PromiseRejectionEvent == 'function')\n      && promise.then(empty) instanceof FakePromise\n      // v8 6.6 (Node 10 and Chrome 66) have a bug with resolving custom thenables\n      // https://bugs.chromium.org/p/chromium/issues/detail?id=830565\n      // we can't detect it synchronously, so just check versions\n      && v8.indexOf('6.6') !== 0\n      && userAgent.indexOf('Chrome/66') === -1;\n  } catch (e) { /* empty */ }\n}();\n\n// helpers\nvar isThenable = function (it) {\n  var then;\n  return isObject(it) && typeof (then = it.then) == 'function' ? then : false;\n};\nvar notify = function (promise, isReject) {\n  if (promise._n) return;\n  promise._n = true;\n  var chain = promise._c;\n  microtask(function () {\n    var value = promise._v;\n    var ok = promise._s == 1;\n    var i = 0;\n    var run = function (reaction) {\n      var handler = ok ? reaction.ok : reaction.fail;\n      var resolve = reaction.resolve;\n      var reject = reaction.reject;\n      var domain = reaction.domain;\n      var result, then, exited;\n      try {\n        if (handler) {\n          if (!ok) {\n            if (promise._h == 2) onHandleUnhandled(promise);\n            promise._h = 1;\n          }\n          if (handler === true) result = value;\n          else {\n            if (domain) domain.enter();\n            result = handler(value); // may throw\n            if (domain) {\n              domain.exit();\n              exited = true;\n            }\n          }\n          if (result === reaction.promise) {\n            reject(TypeError('Promise-chain cycle'));\n          } else if (then = isThenable(result)) {\n            then.call(result, resolve, reject);\n          } else resolve(result);\n        } else reject(value);\n      } catch (e) {\n        if (domain && !exited) domain.exit();\n        reject(e);\n      }\n    };\n    while (chain.length > i) run(chain[i++]); // variable length - can't use forEach\n    promise._c = [];\n    promise._n = false;\n    if (isReject && !promise._h) onUnhandled(promise);\n  });\n};\nvar onUnhandled = function (promise) {\n  task.call(global, function () {\n    var value = promise._v;\n    var unhandled = isUnhandled(promise);\n    var result, handler, console;\n    if (unhandled) {\n      result = perform(function () {\n        if (isNode) {\n          process.emit('unhandledRejection', value, promise);\n        } else if (handler = global.onunhandledrejection) {\n          handler({ promise: promise, reason: value });\n        } else if ((console = global.console) && console.error) {\n          console.error('Unhandled promise rejection', value);\n        }\n      });\n      // Browsers should not trigger `rejectionHandled` event if it was handled here, NodeJS - should\n      promise._h = isNode || isUnhandled(promise) ? 2 : 1;\n    } promise._a = undefined;\n    if (unhandled && result.e) throw result.v;\n  });\n};\nvar isUnhandled = function (promise) {\n  return promise._h !== 1 && (promise._a || promise._c).length === 0;\n};\nvar onHandleUnhandled = function (promise) {\n  task.call(global, function () {\n    var handler;\n    if (isNode) {\n      process.emit('rejectionHandled', promise);\n    } else if (handler = global.onrejectionhandled) {\n      handler({ promise: promise, reason: promise._v });\n    }\n  });\n};\nvar $reject = function (value) {\n  var promise = this;\n  if (promise._d) return;\n  promise._d = true;\n  promise = promise._w || promise; // unwrap\n  promise._v = value;\n  promise._s = 2;\n  if (!promise._a) promise._a = promise._c.slice();\n  notify(promise, true);\n};\nvar $resolve = function (value) {\n  var promise = this;\n  var then;\n  if (promise._d) return;\n  promise._d = true;\n  promise = promise._w || promise; // unwrap\n  try {\n    if (promise === value) throw TypeError(\"Promise can't be resolved itself\");\n    if (then = isThenable(value)) {\n      microtask(function () {\n        var wrapper = { _w: promise, _d: false }; // wrap\n        try {\n          then.call(value, ctx($resolve, wrapper, 1), ctx($reject, wrapper, 1));\n        } catch (e) {\n          $reject.call(wrapper, e);\n        }\n      });\n    } else {\n      promise._v = value;\n      promise._s = 1;\n      notify(promise, false);\n    }\n  } catch (e) {\n    $reject.call({ _w: promise, _d: false }, e); // wrap\n  }\n};\n\n// constructor polyfill\nif (!USE_NATIVE) {\n  // 25.4.3.1 Promise(executor)\n  $Promise = function Promise(executor) {\n    anInstance(this, $Promise, PROMISE, '_h');\n    aFunction(executor);\n    Internal.call(this);\n    try {\n      executor(ctx($resolve, this, 1), ctx($reject, this, 1));\n    } catch (err) {\n      $reject.call(this, err);\n    }\n  };\n  // eslint-disable-next-line no-unused-vars\n  Internal = function Promise(executor) {\n    this._c = [];             // <- awaiting reactions\n    this._a = undefined;      // <- checked in isUnhandled reactions\n    this._s = 0;              // <- state\n    this._d = false;          // <- done\n    this._v = undefined;      // <- value\n    this._h = 0;              // <- rejection state, 0 - default, 1 - handled, 2 - unhandled\n    this._n = false;          // <- notify\n  };\n  Internal.prototype = require('./_redefine-all')($Promise.prototype, {\n    // 25.4.5.3 Promise.prototype.then(onFulfilled, onRejected)\n    then: function then(onFulfilled, onRejected) {\n      var reaction = newPromiseCapability(speciesConstructor(this, $Promise));\n      reaction.ok = typeof onFulfilled == 'function' ? onFulfilled : true;\n      reaction.fail = typeof onRejected == 'function' && onRejected;\n      reaction.domain = isNode ? process.domain : undefined;\n      this._c.push(reaction);\n      if (this._a) this._a.push(reaction);\n      if (this._s) notify(this, false);\n      return reaction.promise;\n    },\n    // 25.4.5.1 Promise.prototype.catch(onRejected)\n    'catch': function (onRejected) {\n      return this.then(undefined, onRejected);\n    }\n  });\n  OwnPromiseCapability = function () {\n    var promise = new Internal();\n    this.promise = promise;\n    this.resolve = ctx($resolve, promise, 1);\n    this.reject = ctx($reject, promise, 1);\n  };\n  newPromiseCapabilityModule.f = newPromiseCapability = function (C) {\n    return C === $Promise || C === Wrapper\n      ? new OwnPromiseCapability(C)\n      : newGenericPromiseCapability(C);\n  };\n}\n\n$export($export.G + $export.W + $export.F * !USE_NATIVE, { Promise: $Promise });\nrequire('./_set-to-string-tag')($Promise, PROMISE);\nrequire('./_set-species')(PROMISE);\nWrapper = require('./_core')[PROMISE];\n\n// statics\n$export($export.S + $export.F * !USE_NATIVE, PROMISE, {\n  // 25.4.4.5 Promise.reject(r)\n  reject: function reject(r) {\n    var capability = newPromiseCapability(this);\n    var $$reject = capability.reject;\n    $$reject(r);\n    return capability.promise;\n  }\n});\n$export($export.S + $export.F * (LIBRARY || !USE_NATIVE), PROMISE, {\n  // 25.4.4.6 Promise.resolve(x)\n  resolve: function resolve(x) {\n    return promiseResolve(LIBRARY && this === Wrapper ? $Promise : this, x);\n  }\n});\n$export($export.S + $export.F * !(USE_NATIVE && require('./_iter-detect')(function (iter) {\n  $Promise.all(iter)['catch'](empty);\n})), PROMISE, {\n  // 25.4.4.1 Promise.all(iterable)\n  all: function all(iterable) {\n    var C = this;\n    var capability = newPromiseCapability(C);\n    var resolve = capability.resolve;\n    var reject = capability.reject;\n    var result = perform(function () {\n      var values = [];\n      var index = 0;\n      var remaining = 1;\n      forOf(iterable, false, function (promise) {\n        var $index = index++;\n        var alreadyCalled = false;\n        values.push(undefined);\n        remaining++;\n        C.resolve(promise).then(function (value) {\n          if (alreadyCalled) return;\n          alreadyCalled = true;\n          values[$index] = value;\n          --remaining || resolve(values);\n        }, reject);\n      });\n      --remaining || resolve(values);\n    });\n    if (result.e) reject(result.v);\n    return capability.promise;\n  },\n  // 25.4.4.4 Promise.race(iterable)\n  race: function race(iterable) {\n    var C = this;\n    var capability = newPromiseCapability(C);\n    var reject = capability.reject;\n    var result = perform(function () {\n      forOf(iterable, false, function (promise) {\n        C.resolve(promise).then(capability.resolve, reject);\n      });\n    });\n    if (result.e) reject(result.v);\n    return capability.promise;\n  }\n});\n","module.exports = function (it, Constructor, name, forbiddenField) {\n  if (!(it instanceof Constructor) || (forbiddenField !== undefined && forbiddenField in it)) {\n    throw TypeError(name + ': incorrect invocation!');\n  } return it;\n};\n","var ctx = require('./_ctx');\nvar call = require('./_iter-call');\nvar isArrayIter = require('./_is-array-iter');\nvar anObject = require('./_an-object');\nvar toLength = require('./_to-length');\nvar getIterFn = require('./core.get-iterator-method');\nvar BREAK = {};\nvar RETURN = {};\nvar exports = module.exports = function (iterable, entries, fn, that, ITERATOR) {\n  var iterFn = ITERATOR ? function () { return iterable; } : getIterFn(iterable);\n  var f = ctx(fn, that, entries ? 2 : 1);\n  var index = 0;\n  var length, step, iterator, result;\n  if (typeof iterFn != 'function') throw TypeError(iterable + ' is not iterable!');\n  // fast case for arrays with default iterator\n  if (isArrayIter(iterFn)) for (length = toLength(iterable.length); length > index; index++) {\n    result = entries ? f(anObject(step = iterable[index])[0], step[1]) : f(iterable[index]);\n    if (result === BREAK || result === RETURN) return result;\n  } else for (iterator = iterFn.call(iterable); !(step = iterator.next()).done;) {\n    result = call(iterator, f, step.value, entries);\n    if (result === BREAK || result === RETURN) return result;\n  }\n};\nexports.BREAK = BREAK;\nexports.RETURN = RETURN;\n","// 7.3.20 SpeciesConstructor(O, defaultConstructor)\nvar anObject = require('./_an-object');\nvar aFunction = require('./_a-function');\nvar SPECIES = require('./_wks')('species');\nmodule.exports = function (O, D) {\n  var C = anObject(O).constructor;\n  var S;\n  return C === undefined || (S = anObject(C)[SPECIES]) == undefined ? D : aFunction(S);\n};\n","var ctx = require('./_ctx');\nvar invoke = require('./_invoke');\nvar html = require('./_html');\nvar cel = require('./_dom-create');\nvar global = require('./_global');\nvar process = global.process;\nvar setTask = global.setImmediate;\nvar clearTask = global.clearImmediate;\nvar MessageChannel = global.MessageChannel;\nvar Dispatch = global.Dispatch;\nvar counter = 0;\nvar queue = {};\nvar ONREADYSTATECHANGE = 'onreadystatechange';\nvar defer, channel, port;\nvar run = function () {\n  var id = +this;\n  // eslint-disable-next-line no-prototype-builtins\n  if (queue.hasOwnProperty(id)) {\n    var fn = queue[id];\n    delete queue[id];\n    fn();\n  }\n};\nvar listener = function (event) {\n  run.call(event.data);\n};\n// Node.js 0.9+ & IE10+ has setImmediate, otherwise:\nif (!setTask || !clearTask) {\n  setTask = function setImmediate(fn) {\n    var args = [];\n    var i = 1;\n    while (arguments.length > i) args.push(arguments[i++]);\n    queue[++counter] = function () {\n      // eslint-disable-next-line no-new-func\n      invoke(typeof fn == 'function' ? fn : Function(fn), args);\n    };\n    defer(counter);\n    return counter;\n  };\n  clearTask = function clearImmediate(id) {\n    delete queue[id];\n  };\n  // Node.js 0.8-\n  if (require('./_cof')(process) == 'process') {\n    defer = function (id) {\n      process.nextTick(ctx(run, id, 1));\n    };\n  // Sphere (JS game engine) Dispatch API\n  } else if (Dispatch && Dispatch.now) {\n    defer = function (id) {\n      Dispatch.now(ctx(run, id, 1));\n    };\n  // Browsers with MessageChannel, includes WebWorkers\n  } else if (MessageChannel) {\n    channel = new MessageChannel();\n    port = channel.port2;\n    channel.port1.onmessage = listener;\n    defer = ctx(port.postMessage, port, 1);\n  // Browsers with postMessage, skip WebWorkers\n  // IE8 has postMessage, but it's sync & typeof its postMessage is 'object'\n  } else if (global.addEventListener && typeof postMessage == 'function' && !global.importScripts) {\n    defer = function (id) {\n      global.postMessage(id + '', '*');\n    };\n    global.addEventListener('message', listener, false);\n  // IE8-\n  } else if (ONREADYSTATECHANGE in cel('script')) {\n    defer = function (id) {\n      html.appendChild(cel('script'))[ONREADYSTATECHANGE] = function () {\n        html.removeChild(this);\n        run.call(id);\n      };\n    };\n  // Rest old browsers\n  } else {\n    defer = function (id) {\n      setTimeout(ctx(run, id, 1), 0);\n    };\n  }\n}\nmodule.exports = {\n  set: setTask,\n  clear: clearTask\n};\n","// fast apply, http://jsperf.lnkit.com/fast-apply/5\nmodule.exports = function (fn, args, that) {\n  var un = that === undefined;\n  switch (args.length) {\n    case 0: return un ? fn()\n                      : fn.call(that);\n    case 1: return un ? fn(args[0])\n                      : fn.call(that, args[0]);\n    case 2: return un ? fn(args[0], args[1])\n                      : fn.call(that, args[0], args[1]);\n    case 3: return un ? fn(args[0], args[1], args[2])\n                      : fn.call(that, args[0], args[1], args[2]);\n    case 4: return un ? fn(args[0], args[1], args[2], args[3])\n                      : fn.call(that, args[0], args[1], args[2], args[3]);\n  } return fn.apply(that, args);\n};\n","var global = require('./_global');\nvar macrotask = require('./_task').set;\nvar Observer = global.MutationObserver || global.WebKitMutationObserver;\nvar process = global.process;\nvar Promise = global.Promise;\nvar isNode = require('./_cof')(process) == 'process';\n\nmodule.exports = function () {\n  var head, last, notify;\n\n  var flush = function () {\n    var parent, fn;\n    if (isNode && (parent = process.domain)) parent.exit();\n    while (head) {\n      fn = head.fn;\n      head = head.next;\n      try {\n        fn();\n      } catch (e) {\n        if (head) notify();\n        else last = undefined;\n        throw e;\n      }\n    } last = undefined;\n    if (parent) parent.enter();\n  };\n\n  // Node.js\n  if (isNode) {\n    notify = function () {\n      process.nextTick(flush);\n    };\n  // browsers with MutationObserver, except iOS Safari - https://github.com/zloirock/core-js/issues/339\n  } else if (Observer && !(global.navigator && global.navigator.standalone)) {\n    var toggle = true;\n    var node = document.createTextNode('');\n    new Observer(flush).observe(node, { characterData: true }); // eslint-disable-line no-new\n    notify = function () {\n      node.data = toggle = !toggle;\n    };\n  // environments with maybe non-completely correct, but existent Promise\n  } else if (Promise && Promise.resolve) {\n    // Promise.resolve without an argument throws an error in LG WebOS 2\n    var promise = Promise.resolve(undefined);\n    notify = function () {\n      promise.then(flush);\n    };\n  // for other environments - macrotask based on:\n  // - setImmediate\n  // - MessageChannel\n  // - window.postMessag\n  // - onreadystatechange\n  // - setTimeout\n  } else {\n    notify = function () {\n      // strange IE + webpack dev server bug - use .call(global)\n      macrotask.call(global, flush);\n    };\n  }\n\n  return function (fn) {\n    var task = { fn: fn, next: undefined };\n    if (last) last.next = task;\n    if (!head) {\n      head = task;\n      notify();\n    } last = task;\n  };\n};\n","'use strict';\n// 25.4.1.5 NewPromiseCapability(C)\nvar aFunction = require('./_a-function');\n\nfunction PromiseCapability(C) {\n  var resolve, reject;\n  this.promise = new C(function ($$resolve, $$reject) {\n    if (resolve !== undefined || reject !== undefined) throw TypeError('Bad Promise constructor');\n    resolve = $$resolve;\n    reject = $$reject;\n  });\n  this.resolve = aFunction(resolve);\n  this.reject = aFunction(reject);\n}\n\nmodule.exports.f = function (C) {\n  return new PromiseCapability(C);\n};\n","module.exports = function (exec) {\n  try {\n    return { e: false, v: exec() };\n  } catch (e) {\n    return { e: true, v: e };\n  }\n};\n","var global = require('./_global');\nvar navigator = global.navigator;\n\nmodule.exports = navigator && navigator.userAgent || '';\n","var anObject = require('./_an-object');\nvar isObject = require('./_is-object');\nvar newPromiseCapability = require('./_new-promise-capability');\n\nmodule.exports = function (C, x) {\n  anObject(C);\n  if (isObject(x) && x.constructor === C) return x;\n  var promiseCapability = newPromiseCapability.f(C);\n  var resolve = promiseCapability.resolve;\n  resolve(x);\n  return promiseCapability.promise;\n};\n","var redefine = require('./_redefine');\nmodule.exports = function (target, src, safe) {\n  for (var key in src) redefine(target, key, src[key], safe);\n  return target;\n};\n","'use strict';\nvar global = require('./_global');\nvar dP = require('./_object-dp');\nvar DESCRIPTORS = require('./_descriptors');\nvar SPECIES = require('./_wks')('species');\n\nmodule.exports = function (KEY) {\n  var C = global[KEY];\n  if (DESCRIPTORS && C && !C[SPECIES]) dP.f(C, SPECIES, {\n    configurable: true,\n    get: function () { return this; }\n  });\n};\n","// https://github.com/tc39/proposal-promise-finally\n'use strict';\nvar $export = require('./_export');\nvar core = require('./_core');\nvar global = require('./_global');\nvar speciesConstructor = require('./_species-constructor');\nvar promiseResolve = require('./_promise-resolve');\n\n$export($export.P + $export.R, 'Promise', { 'finally': function (onFinally) {\n  var C = speciesConstructor(this, core.Promise || global.Promise);\n  var isFunction = typeof onFinally == 'function';\n  return this.then(\n    isFunction ? function (x) {\n      return promiseResolve(C, onFinally()).then(function () { return x; });\n    } : onFinally,\n    isFunction ? function (e) {\n      return promiseResolve(C, onFinally()).then(function () { throw e; });\n    } : onFinally\n  );\n} });\n","'use strict';\n// https://github.com/tc39/proposal-promise-try\nvar $export = require('./_export');\nvar newPromiseCapability = require('./_new-promise-capability');\nvar perform = require('./_perform');\n\n$export($export.S, 'Promise', { 'try': function (callbackfn) {\n  var promiseCapability = newPromiseCapability.f(this);\n  var result = perform(callbackfn);\n  (result.e ? promiseCapability.reject : promiseCapability.resolve)(result.v);\n  return promiseCapability.promise;\n} });\n","require('../modules/es6.object.to-string');\nrequire('../modules/web.dom.iterable');\nrequire('../modules/es6.weak-map');\nrequire('../modules/es7.weak-map.of');\nrequire('../modules/es7.weak-map.from');\nmodule.exports = require('../modules/_core').WeakMap;\n","'use strict';\nvar each = require('./_array-methods')(0);\nvar redefine = require('./_redefine');\nvar meta = require('./_meta');\nvar assign = require('./_object-assign');\nvar weak = require('./_collection-weak');\nvar isObject = require('./_is-object');\nvar fails = require('./_fails');\nvar validate = require('./_validate-collection');\nvar WEAK_MAP = 'WeakMap';\nvar getWeak = meta.getWeak;\nvar isExtensible = Object.isExtensible;\nvar uncaughtFrozenStore = weak.ufstore;\nvar tmp = {};\nvar InternalMap;\n\nvar wrapper = function (get) {\n  return function WeakMap() {\n    return get(this, arguments.length > 0 ? arguments[0] : undefined);\n  };\n};\n\nvar methods = {\n  // 23.3.3.3 WeakMap.prototype.get(key)\n  get: function get(key) {\n    if (isObject(key)) {\n      var data = getWeak(key);\n      if (data === true) return uncaughtFrozenStore(validate(this, WEAK_MAP)).get(key);\n      return data ? data[this._i] : undefined;\n    }\n  },\n  // 23.3.3.5 WeakMap.prototype.set(key, value)\n  set: function set(key, value) {\n    return weak.def(validate(this, WEAK_MAP), key, value);\n  }\n};\n\n// 23.3 WeakMap Objects\nvar $WeakMap = module.exports = require('./_collection')(WEAK_MAP, wrapper, methods, weak, true, true);\n\n// IE11 WeakMap frozen keys fix\nif (fails(function () { return new $WeakMap().set((Object.freeze || Object)(tmp), 7).get(tmp) != 7; })) {\n  InternalMap = weak.getConstructor(wrapper, WEAK_MAP);\n  assign(InternalMap.prototype, methods);\n  meta.NEED = true;\n  each(['delete', 'has', 'get', 'set'], function (key) {\n    var proto = $WeakMap.prototype;\n    var method = proto[key];\n    redefine(proto, key, function (a, b) {\n      // store frozen objects on internal weakmap shim\n      if (isObject(a) && !isExtensible(a)) {\n        if (!this._f) this._f = new InternalMap();\n        var result = this._f[key](a, b);\n        return key == 'set' ? this : result;\n      // store all the rest on native weakmap\n      } return method.call(this, a, b);\n    });\n  });\n}\n","// 0 -> Array#forEach\n// 1 -> Array#map\n// 2 -> Array#filter\n// 3 -> Array#some\n// 4 -> Array#every\n// 5 -> Array#find\n// 6 -> Array#findIndex\nvar ctx = require('./_ctx');\nvar IObject = require('./_iobject');\nvar toObject = require('./_to-object');\nvar toLength = require('./_to-length');\nvar asc = require('./_array-species-create');\nmodule.exports = function (TYPE, $create) {\n  var IS_MAP = TYPE == 1;\n  var IS_FILTER = TYPE == 2;\n  var IS_SOME = TYPE == 3;\n  var IS_EVERY = TYPE == 4;\n  var IS_FIND_INDEX = TYPE == 6;\n  var NO_HOLES = TYPE == 5 || IS_FIND_INDEX;\n  var create = $create || asc;\n  return function ($this, callbackfn, that) {\n    var O = toObject($this);\n    var self = IObject(O);\n    var f = ctx(callbackfn, that, 3);\n    var length = toLength(self.length);\n    var index = 0;\n    var result = IS_MAP ? create($this, length) : IS_FILTER ? create($this, 0) : undefined;\n    var val, res;\n    for (;length > index; index++) if (NO_HOLES || index in self) {\n      val = self[index];\n      res = f(val, index, O);\n      if (TYPE) {\n        if (IS_MAP) result[index] = res;   // map\n        else if (res) switch (TYPE) {\n          case 3: return true;             // some\n          case 5: return val;              // find\n          case 6: return index;            // findIndex\n          case 2: result.push(val);        // filter\n        } else if (IS_EVERY) return false; // every\n      }\n    }\n    return IS_FIND_INDEX ? -1 : IS_SOME || IS_EVERY ? IS_EVERY : result;\n  };\n};\n","// 9.4.2.3 ArraySpeciesCreate(originalArray, length)\nvar speciesConstructor = require('./_array-species-constructor');\n\nmodule.exports = function (original, length) {\n  return new (speciesConstructor(original))(length);\n};\n","var isObject = require('./_is-object');\nvar isArray = require('./_is-array');\nvar SPECIES = require('./_wks')('species');\n\nmodule.exports = function (original) {\n  var C;\n  if (isArray(original)) {\n    C = original.constructor;\n    // cross-realm fallback\n    if (typeof C == 'function' && (C === Array || isArray(C.prototype))) C = undefined;\n    if (isObject(C)) {\n      C = C[SPECIES];\n      if (C === null) C = undefined;\n    }\n  } return C === undefined ? Array : C;\n};\n","// 7.2.2 IsArray(argument)\nvar cof = require('./_cof');\nmodule.exports = Array.isArray || function isArray(arg) {\n  return cof(arg) == 'Array';\n};\n","var META = require('./_uid')('meta');\nvar isObject = require('./_is-object');\nvar has = require('./_has');\nvar setDesc = require('./_object-dp').f;\nvar id = 0;\nvar isExtensible = Object.isExtensible || function () {\n  return true;\n};\nvar FREEZE = !require('./_fails')(function () {\n  return isExtensible(Object.preventExtensions({}));\n});\nvar setMeta = function (it) {\n  setDesc(it, META, { value: {\n    i: 'O' + ++id, // object ID\n    w: {}          // weak collections IDs\n  } });\n};\nvar fastKey = function (it, create) {\n  // return primitive with prefix\n  if (!isObject(it)) return typeof it == 'symbol' ? it : (typeof it == 'string' ? 'S' : 'P') + it;\n  if (!has(it, META)) {\n    // can't set metadata to uncaught frozen object\n    if (!isExtensible(it)) return 'F';\n    // not necessary to add metadata\n    if (!create) return 'E';\n    // add missing metadata\n    setMeta(it);\n  // return object ID\n  } return it[META].i;\n};\nvar getWeak = function (it, create) {\n  if (!has(it, META)) {\n    // can't set metadata to uncaught frozen object\n    if (!isExtensible(it)) return true;\n    // not necessary to add metadata\n    if (!create) return false;\n    // add missing metadata\n    setMeta(it);\n  // return hash weak collections IDs\n  } return it[META].w;\n};\n// add metadata on freeze-family methods calling\nvar onFreeze = function (it) {\n  if (FREEZE && meta.NEED && isExtensible(it) && !has(it, META)) setMeta(it);\n  return it;\n};\nvar meta = module.exports = {\n  KEY: META,\n  NEED: false,\n  fastKey: fastKey,\n  getWeak: getWeak,\n  onFreeze: onFreeze\n};\n","'use strict';\nvar redefineAll = require('./_redefine-all');\nvar getWeak = require('./_meta').getWeak;\nvar anObject = require('./_an-object');\nvar isObject = require('./_is-object');\nvar anInstance = require('./_an-instance');\nvar forOf = require('./_for-of');\nvar createArrayMethod = require('./_array-methods');\nvar $has = require('./_has');\nvar validate = require('./_validate-collection');\nvar arrayFind = createArrayMethod(5);\nvar arrayFindIndex = createArrayMethod(6);\nvar id = 0;\n\n// fallback for uncaught frozen keys\nvar uncaughtFrozenStore = function (that) {\n  return that._l || (that._l = new UncaughtFrozenStore());\n};\nvar UncaughtFrozenStore = function () {\n  this.a = [];\n};\nvar findUncaughtFrozen = function (store, key) {\n  return arrayFind(store.a, function (it) {\n    return it[0] === key;\n  });\n};\nUncaughtFrozenStore.prototype = {\n  get: function (key) {\n    var entry = findUncaughtFrozen(this, key);\n    if (entry) return entry[1];\n  },\n  has: function (key) {\n    return !!findUncaughtFrozen(this, key);\n  },\n  set: function (key, value) {\n    var entry = findUncaughtFrozen(this, key);\n    if (entry) entry[1] = value;\n    else this.a.push([key, value]);\n  },\n  'delete': function (key) {\n    var index = arrayFindIndex(this.a, function (it) {\n      return it[0] === key;\n    });\n    if (~index) this.a.splice(index, 1);\n    return !!~index;\n  }\n};\n\nmodule.exports = {\n  getConstructor: function (wrapper, NAME, IS_MAP, ADDER) {\n    var C = wrapper(function (that, iterable) {\n      anInstance(that, C, NAME, '_i');\n      that._t = NAME;      // collection type\n      that._i = id++;      // collection id\n      that._l = undefined; // leak store for uncaught frozen objects\n      if (iterable != undefined) forOf(iterable, IS_MAP, that[ADDER], that);\n    });\n    redefineAll(C.prototype, {\n      // 23.3.3.2 WeakMap.prototype.delete(key)\n      // 23.4.3.3 WeakSet.prototype.delete(value)\n      'delete': function (key) {\n        if (!isObject(key)) return false;\n        var data = getWeak(key);\n        if (data === true) return uncaughtFrozenStore(validate(this, NAME))['delete'](key);\n        return data && $has(data, this._i) && delete data[this._i];\n      },\n      // 23.3.3.4 WeakMap.prototype.has(key)\n      // 23.4.3.4 WeakSet.prototype.has(value)\n      has: function has(key) {\n        if (!isObject(key)) return false;\n        var data = getWeak(key);\n        if (data === true) return uncaughtFrozenStore(validate(this, NAME)).has(key);\n        return data && $has(data, this._i);\n      }\n    });\n    return C;\n  },\n  def: function (that, key, value) {\n    var data = getWeak(anObject(key), true);\n    if (data === true) uncaughtFrozenStore(that).set(key, value);\n    else data[that._i] = value;\n    return that;\n  },\n  ufstore: uncaughtFrozenStore\n};\n","var isObject = require('./_is-object');\nmodule.exports = function (it, TYPE) {\n  if (!isObject(it) || it._t !== TYPE) throw TypeError('Incompatible receiver, ' + TYPE + ' required!');\n  return it;\n};\n","'use strict';\nvar global = require('./_global');\nvar $export = require('./_export');\nvar redefine = require('./_redefine');\nvar redefineAll = require('./_redefine-all');\nvar meta = require('./_meta');\nvar forOf = require('./_for-of');\nvar anInstance = require('./_an-instance');\nvar isObject = require('./_is-object');\nvar fails = require('./_fails');\nvar $iterDetect = require('./_iter-detect');\nvar setToStringTag = require('./_set-to-string-tag');\nvar inheritIfRequired = require('./_inherit-if-required');\n\nmodule.exports = function (NAME, wrapper, methods, common, IS_MAP, IS_WEAK) {\n  var Base = global[NAME];\n  var C = Base;\n  var ADDER = IS_MAP ? 'set' : 'add';\n  var proto = C && C.prototype;\n  var O = {};\n  var fixMethod = function (KEY) {\n    var fn = proto[KEY];\n    redefine(proto, KEY,\n      KEY == 'delete' ? function (a) {\n        return IS_WEAK && !isObject(a) ? false : fn.call(this, a === 0 ? 0 : a);\n      } : KEY == 'has' ? function has(a) {\n        return IS_WEAK && !isObject(a) ? false : fn.call(this, a === 0 ? 0 : a);\n      } : KEY == 'get' ? function get(a) {\n        return IS_WEAK && !isObject(a) ? undefined : fn.call(this, a === 0 ? 0 : a);\n      } : KEY == 'add' ? function add(a) { fn.call(this, a === 0 ? 0 : a); return this; }\n        : function set(a, b) { fn.call(this, a === 0 ? 0 : a, b); return this; }\n    );\n  };\n  if (typeof C != 'function' || !(IS_WEAK || proto.forEach && !fails(function () {\n    new C().entries().next();\n  }))) {\n    // create collection constructor\n    C = common.getConstructor(wrapper, NAME, IS_MAP, ADDER);\n    redefineAll(C.prototype, methods);\n    meta.NEED = true;\n  } else {\n    var instance = new C();\n    // early implementations not supports chaining\n    var HASNT_CHAINING = instance[ADDER](IS_WEAK ? {} : -0, 1) != instance;\n    // V8 ~  Chromium 40- weak-collections throws on primitives, but should return false\n    var THROWS_ON_PRIMITIVES = fails(function () { instance.has(1); });\n    // most early implementations doesn't supports iterables, most modern - not close it correctly\n    var ACCEPT_ITERABLES = $iterDetect(function (iter) { new C(iter); }); // eslint-disable-line no-new\n    // for early implementations -0 and +0 not the same\n    var BUGGY_ZERO = !IS_WEAK && fails(function () {\n      // V8 ~ Chromium 42- fails only with 5+ elements\n      var $instance = new C();\n      var index = 5;\n      while (index--) $instance[ADDER](index, index);\n      return !$instance.has(-0);\n    });\n    if (!ACCEPT_ITERABLES) {\n      C = wrapper(function (target, iterable) {\n        anInstance(target, C, NAME);\n        var that = inheritIfRequired(new Base(), target, C);\n        if (iterable != undefined) forOf(iterable, IS_MAP, that[ADDER], that);\n        return that;\n      });\n      C.prototype = proto;\n      proto.constructor = C;\n    }\n    if (THROWS_ON_PRIMITIVES || BUGGY_ZERO) {\n      fixMethod('delete');\n      fixMethod('has');\n      IS_MAP && fixMethod('get');\n    }\n    if (BUGGY_ZERO || HASNT_CHAINING) fixMethod(ADDER);\n    // weak collections should not contains .clear method\n    if (IS_WEAK && proto.clear) delete proto.clear;\n  }\n\n  setToStringTag(C, NAME);\n\n  O[NAME] = C;\n  $export($export.G + $export.W + $export.F * (C != Base), O);\n\n  if (!IS_WEAK) common.setStrong(C, NAME, IS_MAP);\n\n  return C;\n};\n","var isObject = require('./_is-object');\nvar setPrototypeOf = require('./_set-proto').set;\nmodule.exports = function (that, target, C) {\n  var S = target.constructor;\n  var P;\n  if (S !== C && typeof S == 'function' && (P = S.prototype) !== C.prototype && isObject(P) && setPrototypeOf) {\n    setPrototypeOf(that, P);\n  } return that;\n};\n","// Works with __proto__ only. Old v8 can't work with null proto objects.\n/* eslint-disable no-proto */\nvar isObject = require('./_is-object');\nvar anObject = require('./_an-object');\nvar check = function (O, proto) {\n  anObject(O);\n  if (!isObject(proto) && proto !== null) throw TypeError(proto + \": can't set as prototype!\");\n};\nmodule.exports = {\n  set: Object.setPrototypeOf || ('__proto__' in {} ? // eslint-disable-line\n    function (test, buggy, set) {\n      try {\n        set = require('./_ctx')(Function.call, require('./_object-gopd').f(Object.prototype, '__proto__').set, 2);\n        set(test, []);\n        buggy = !(test instanceof Array);\n      } catch (e) { buggy = true; }\n      return function setPrototypeOf(O, proto) {\n        check(O, proto);\n        if (buggy) O.__proto__ = proto;\n        else set(O, proto);\n        return O;\n      };\n    }({}, false) : undefined),\n  check: check\n};\n","var pIE = require('./_object-pie');\nvar createDesc = require('./_property-desc');\nvar toIObject = require('./_to-iobject');\nvar toPrimitive = require('./_to-primitive');\nvar has = require('./_has');\nvar IE8_DOM_DEFINE = require('./_ie8-dom-define');\nvar gOPD = Object.getOwnPropertyDescriptor;\n\nexports.f = require('./_descriptors') ? gOPD : function getOwnPropertyDescriptor(O, P) {\n  O = toIObject(O);\n  P = toPrimitive(P, true);\n  if (IE8_DOM_DEFINE) try {\n    return gOPD(O, P);\n  } catch (e) { /* empty */ }\n  if (has(O, P)) return createDesc(!pIE.f.call(O, P), O[P]);\n};\n","// https://tc39.github.io/proposal-setmap-offrom/#sec-weakmap.of\nrequire('./_set-collection-of')('WeakMap');\n","'use strict';\n// https://tc39.github.io/proposal-setmap-offrom/\nvar $export = require('./_export');\n\nmodule.exports = function (COLLECTION) {\n  $export($export.S, COLLECTION, { of: function of() {\n    var length = arguments.length;\n    var A = new Array(length);\n    while (length--) A[length] = arguments[length];\n    return new this(A);\n  } });\n};\n","// https://tc39.github.io/proposal-setmap-offrom/#sec-weakmap.from\nrequire('./_set-collection-from')('WeakMap');\n","'use strict';\n// https://tc39.github.io/proposal-setmap-offrom/\nvar $export = require('./_export');\nvar aFunction = require('./_a-function');\nvar ctx = require('./_ctx');\nvar forOf = require('./_for-of');\n\nmodule.exports = function (COLLECTION) {\n  $export($export.S, COLLECTION, { from: function from(source /* , mapFn, thisArg */) {\n    var mapFn = arguments[1];\n    var mapping, A, n, cb;\n    aFunction(this);\n    mapping = mapFn !== undefined;\n    if (mapping) aFunction(mapFn);\n    if (source == undefined) return new this();\n    A = [];\n    if (mapping) {\n      n = 0;\n      cb = ctx(mapFn, arguments[2], 2);\n      forOf(source, false, function (nextItem) {\n        A.push(cb(nextItem, n++));\n      });\n    } else {\n      forOf(source, false, A.push, A);\n    }\n    return new this(A);\n  } });\n};\n","require('../modules/es6.object.to-string');\nrequire('../modules/web.dom.iterable');\nrequire('../modules/es6.weak-set');\nrequire('../modules/es7.weak-set.of');\nrequire('../modules/es7.weak-set.from');\nmodule.exports = require('../modules/_core').WeakSet;\n","'use strict';\nvar weak = require('./_collection-weak');\nvar validate = require('./_validate-collection');\nvar WEAK_SET = 'WeakSet';\n\n// 23.4 WeakSet Objects\nrequire('./_collection')(WEAK_SET, function (get) {\n  return function WeakSet() { return get(this, arguments.length > 0 ? arguments[0] : undefined); };\n}, {\n  // 23.4.3.1 WeakSet.prototype.add(value)\n  add: function add(value) {\n    return weak.def(validate(this, WEAK_SET), value, true);\n  }\n}, weak, false, true);\n","// https://tc39.github.io/proposal-setmap-offrom/#sec-weakset.of\nrequire('./_set-collection-of')('WeakSet');\n","// https://tc39.github.io/proposal-setmap-offrom/#sec-weakset.from\nrequire('./_set-collection-from')('WeakSet');\n","require('../../modules/es6.string.code-point-at');\nmodule.exports = require('../../modules/_core').String.codePointAt;\n","'use strict';\nvar $export = require('./_export');\nvar $at = require('./_string-at')(false);\n$export($export.P, 'String', {\n  // 21.1.3.3 String.prototype.codePointAt(pos)\n  codePointAt: function codePointAt(pos) {\n    return $at(this, pos);\n  }\n});\n","require('../../modules/es6.string.from-code-point');\nmodule.exports = require('../../modules/_core').String.fromCodePoint;\n","var $export = require('./_export');\nvar toAbsoluteIndex = require('./_to-absolute-index');\nvar fromCharCode = String.fromCharCode;\nvar $fromCodePoint = String.fromCodePoint;\n\n// length should be 1, old FF problem\n$export($export.S + $export.F * (!!$fromCodePoint && $fromCodePoint.length != 1), 'String', {\n  // 21.1.2.2 String.fromCodePoint(...codePoints)\n  fromCodePoint: function fromCodePoint(x) { // eslint-disable-line no-unused-vars\n    var res = [];\n    var aLen = arguments.length;\n    var i = 0;\n    var code;\n    while (aLen > i) {\n      code = +arguments[i++];\n      if (toAbsoluteIndex(code, 0x10ffff) !== code) throw RangeError(code + ' is not a valid code point');\n      res.push(code < 0x10000\n        ? fromCharCode(code)\n        : fromCharCode(((code -= 0x10000) >> 10) + 0xd800, code % 0x400 + 0xdc00)\n      );\n    } return res.join('');\n  }\n});\n","require('../modules/es6.symbol');\nrequire('../modules/es6.object.to-string');\nmodule.exports = require('../modules/_core').Symbol;\n","'use strict';\n// ECMAScript 6 symbols shim\nvar global = require('./_global');\nvar has = require('./_has');\nvar DESCRIPTORS = require('./_descriptors');\nvar $export = require('./_export');\nvar redefine = require('./_redefine');\nvar META = require('./_meta').KEY;\nvar $fails = require('./_fails');\nvar shared = require('./_shared');\nvar setToStringTag = require('./_set-to-string-tag');\nvar uid = require('./_uid');\nvar wks = require('./_wks');\nvar wksExt = require('./_wks-ext');\nvar wksDefine = require('./_wks-define');\nvar enumKeys = require('./_enum-keys');\nvar isArray = require('./_is-array');\nvar anObject = require('./_an-object');\nvar isObject = require('./_is-object');\nvar toIObject = require('./_to-iobject');\nvar toPrimitive = require('./_to-primitive');\nvar createDesc = require('./_property-desc');\nvar _create = require('./_object-create');\nvar gOPNExt = require('./_object-gopn-ext');\nvar $GOPD = require('./_object-gopd');\nvar $DP = require('./_object-dp');\nvar $keys = require('./_object-keys');\nvar gOPD = $GOPD.f;\nvar dP = $DP.f;\nvar gOPN = gOPNExt.f;\nvar $Symbol = global.Symbol;\nvar $JSON = global.JSON;\nvar _stringify = $JSON && $JSON.stringify;\nvar PROTOTYPE = 'prototype';\nvar HIDDEN = wks('_hidden');\nvar TO_PRIMITIVE = wks('toPrimitive');\nvar isEnum = {}.propertyIsEnumerable;\nvar SymbolRegistry = shared('symbol-registry');\nvar AllSymbols = shared('symbols');\nvar OPSymbols = shared('op-symbols');\nvar ObjectProto = Object[PROTOTYPE];\nvar USE_NATIVE = typeof $Symbol == 'function';\nvar QObject = global.QObject;\n// Don't use setters in Qt Script, https://github.com/zloirock/core-js/issues/173\nvar setter = !QObject || !QObject[PROTOTYPE] || !QObject[PROTOTYPE].findChild;\n\n// fallback for old Android, https://code.google.com/p/v8/issues/detail?id=687\nvar setSymbolDesc = DESCRIPTORS && $fails(function () {\n  return _create(dP({}, 'a', {\n    get: function () { return dP(this, 'a', { value: 7 }).a; }\n  })).a != 7;\n}) ? function (it, key, D) {\n  var protoDesc = gOPD(ObjectProto, key);\n  if (protoDesc) delete ObjectProto[key];\n  dP(it, key, D);\n  if (protoDesc && it !== ObjectProto) dP(ObjectProto, key, protoDesc);\n} : dP;\n\nvar wrap = function (tag) {\n  var sym = AllSymbols[tag] = _create($Symbol[PROTOTYPE]);\n  sym._k = tag;\n  return sym;\n};\n\nvar isSymbol = USE_NATIVE && typeof $Symbol.iterator == 'symbol' ? function (it) {\n  return typeof it == 'symbol';\n} : function (it) {\n  return it instanceof $Symbol;\n};\n\nvar $defineProperty = function defineProperty(it, key, D) {\n  if (it === ObjectProto) $defineProperty(OPSymbols, key, D);\n  anObject(it);\n  key = toPrimitive(key, true);\n  anObject(D);\n  if (has(AllSymbols, key)) {\n    if (!D.enumerable) {\n      if (!has(it, HIDDEN)) dP(it, HIDDEN, createDesc(1, {}));\n      it[HIDDEN][key] = true;\n    } else {\n      if (has(it, HIDDEN) && it[HIDDEN][key]) it[HIDDEN][key] = false;\n      D = _create(D, { enumerable: createDesc(0, false) });\n    } return setSymbolDesc(it, key, D);\n  } return dP(it, key, D);\n};\nvar $defineProperties = function defineProperties(it, P) {\n  anObject(it);\n  var keys = enumKeys(P = toIObject(P));\n  var i = 0;\n  var l = keys.length;\n  var key;\n  while (l > i) $defineProperty(it, key = keys[i++], P[key]);\n  return it;\n};\nvar $create = function create(it, P) {\n  return P === undefined ? _create(it) : $defineProperties(_create(it), P);\n};\nvar $propertyIsEnumerable = function propertyIsEnumerable(key) {\n  var E = isEnum.call(this, key = toPrimitive(key, true));\n  if (this === ObjectProto && has(AllSymbols, key) && !has(OPSymbols, key)) return false;\n  return E || !has(this, key) || !has(AllSymbols, key) || has(this, HIDDEN) && this[HIDDEN][key] ? E : true;\n};\nvar $getOwnPropertyDescriptor = function getOwnPropertyDescriptor(it, key) {\n  it = toIObject(it);\n  key = toPrimitive(key, true);\n  if (it === ObjectProto && has(AllSymbols, key) && !has(OPSymbols, key)) return;\n  var D = gOPD(it, key);\n  if (D && has(AllSymbols, key) && !(has(it, HIDDEN) && it[HIDDEN][key])) D.enumerable = true;\n  return D;\n};\nvar $getOwnPropertyNames = function getOwnPropertyNames(it) {\n  var names = gOPN(toIObject(it));\n  var result = [];\n  var i = 0;\n  var key;\n  while (names.length > i) {\n    if (!has(AllSymbols, key = names[i++]) && key != HIDDEN && key != META) result.push(key);\n  } return result;\n};\nvar $getOwnPropertySymbols = function getOwnPropertySymbols(it) {\n  var IS_OP = it === ObjectProto;\n  var names = gOPN(IS_OP ? OPSymbols : toIObject(it));\n  var result = [];\n  var i = 0;\n  var key;\n  while (names.length > i) {\n    if (has(AllSymbols, key = names[i++]) && (IS_OP ? has(ObjectProto, key) : true)) result.push(AllSymbols[key]);\n  } return result;\n};\n\n// 19.4.1.1 Symbol([description])\nif (!USE_NATIVE) {\n  $Symbol = function Symbol() {\n    if (this instanceof $Symbol) throw TypeError('Symbol is not a constructor!');\n    var tag = uid(arguments.length > 0 ? arguments[0] : undefined);\n    var $set = function (value) {\n      if (this === ObjectProto) $set.call(OPSymbols, value);\n      if (has(this, HIDDEN) && has(this[HIDDEN], tag)) this[HIDDEN][tag] = false;\n      setSymbolDesc(this, tag, createDesc(1, value));\n    };\n    if (DESCRIPTORS && setter) setSymbolDesc(ObjectProto, tag, { configurable: true, set: $set });\n    return wrap(tag);\n  };\n  redefine($Symbol[PROTOTYPE], 'toString', function toString() {\n    return this._k;\n  });\n\n  $GOPD.f = $getOwnPropertyDescriptor;\n  $DP.f = $defineProperty;\n  require('./_object-gopn').f = gOPNExt.f = $getOwnPropertyNames;\n  require('./_object-pie').f = $propertyIsEnumerable;\n  require('./_object-gops').f = $getOwnPropertySymbols;\n\n  if (DESCRIPTORS && !require('./_library')) {\n    redefine(ObjectProto, 'propertyIsEnumerable', $propertyIsEnumerable, true);\n  }\n\n  wksExt.f = function (name) {\n    return wrap(wks(name));\n  };\n}\n\n$export($export.G + $export.W + $export.F * !USE_NATIVE, { Symbol: $Symbol });\n\nfor (var es6Symbols = (\n  // 19.4.2.2, 19.4.2.3, 19.4.2.4, 19.4.2.6, 19.4.2.8, 19.4.2.9, 19.4.2.10, 19.4.2.11, 19.4.2.12, 19.4.2.13, 19.4.2.14\n  'hasInstance,isConcatSpreadable,iterator,match,replace,search,species,split,toPrimitive,toStringTag,unscopables'\n).split(','), j = 0; es6Symbols.length > j;)wks(es6Symbols[j++]);\n\nfor (var wellKnownSymbols = $keys(wks.store), k = 0; wellKnownSymbols.length > k;) wksDefine(wellKnownSymbols[k++]);\n\n$export($export.S + $export.F * !USE_NATIVE, 'Symbol', {\n  // 19.4.2.1 Symbol.for(key)\n  'for': function (key) {\n    return has(SymbolRegistry, key += '')\n      ? SymbolRegistry[key]\n      : SymbolRegistry[key] = $Symbol(key);\n  },\n  // 19.4.2.5 Symbol.keyFor(sym)\n  keyFor: function keyFor(sym) {\n    if (!isSymbol(sym)) throw TypeError(sym + ' is not a symbol!');\n    for (var key in SymbolRegistry) if (SymbolRegistry[key] === sym) return key;\n  },\n  useSetter: function () { setter = true; },\n  useSimple: function () { setter = false; }\n});\n\n$export($export.S + $export.F * !USE_NATIVE, 'Object', {\n  // 19.1.2.2 Object.create(O [, Properties])\n  create: $create,\n  // 19.1.2.4 Object.defineProperty(O, P, Attributes)\n  defineProperty: $defineProperty,\n  // 19.1.2.3 Object.defineProperties(O, Properties)\n  defineProperties: $defineProperties,\n  // 19.1.2.6 Object.getOwnPropertyDescriptor(O, P)\n  getOwnPropertyDescriptor: $getOwnPropertyDescriptor,\n  // 19.1.2.7 Object.getOwnPropertyNames(O)\n  getOwnPropertyNames: $getOwnPropertyNames,\n  // 19.1.2.8 Object.getOwnPropertySymbols(O)\n  getOwnPropertySymbols: $getOwnPropertySymbols\n});\n\n// 24.3.2 JSON.stringify(value [, replacer [, space]])\n$JSON && $export($export.S + $export.F * (!USE_NATIVE || $fails(function () {\n  var S = $Symbol();\n  // MS Edge converts symbol values to JSON as {}\n  // WebKit converts symbol values to JSON as null\n  // V8 throws on boxed symbols\n  return _stringify([S]) != '[null]' || _stringify({ a: S }) != '{}' || _stringify(Object(S)) != '{}';\n})), 'JSON', {\n  stringify: function stringify(it) {\n    var args = [it];\n    var i = 1;\n    var replacer, $replacer;\n    while (arguments.length > i) args.push(arguments[i++]);\n    $replacer = replacer = args[1];\n    if (!isObject(replacer) && it === undefined || isSymbol(it)) return; // IE8 returns string on undefined\n    if (!isArray(replacer)) replacer = function (key, value) {\n      if (typeof $replacer == 'function') value = $replacer.call(this, key, value);\n      if (!isSymbol(value)) return value;\n    };\n    args[1] = replacer;\n    return _stringify.apply($JSON, args);\n  }\n});\n\n// 19.4.3.4 Symbol.prototype[@@toPrimitive](hint)\n$Symbol[PROTOTYPE][TO_PRIMITIVE] || require('./_hide')($Symbol[PROTOTYPE], TO_PRIMITIVE, $Symbol[PROTOTYPE].valueOf);\n// 19.4.3.5 Symbol.prototype[@@toStringTag]\nsetToStringTag($Symbol, 'Symbol');\n// 20.2.1.9 Math[@@toStringTag]\nsetToStringTag(Math, 'Math', true);\n// 24.3.3 JSON[@@toStringTag]\nsetToStringTag(global.JSON, 'JSON', true);\n","exports.f = require('./_wks');\n","var global = require('./_global');\nvar core = require('./_core');\nvar LIBRARY = require('./_library');\nvar wksExt = require('./_wks-ext');\nvar defineProperty = require('./_object-dp').f;\nmodule.exports = function (name) {\n  var $Symbol = core.Symbol || (core.Symbol = LIBRARY ? {} : global.Symbol || {});\n  if (name.charAt(0) != '_' && !(name in $Symbol)) defineProperty($Symbol, name, { value: wksExt.f(name) });\n};\n","// all enumerable object keys, includes symbols\nvar getKeys = require('./_object-keys');\nvar gOPS = require('./_object-gops');\nvar pIE = require('./_object-pie');\nmodule.exports = function (it) {\n  var result = getKeys(it);\n  var getSymbols = gOPS.f;\n  if (getSymbols) {\n    var symbols = getSymbols(it);\n    var isEnum = pIE.f;\n    var i = 0;\n    var key;\n    while (symbols.length > i) if (isEnum.call(it, key = symbols[i++])) result.push(key);\n  } return result;\n};\n","// fallback for IE11 buggy Object.getOwnPropertyNames with iframe and window\nvar toIObject = require('./_to-iobject');\nvar gOPN = require('./_object-gopn').f;\nvar toString = {}.toString;\n\nvar windowNames = typeof window == 'object' && window && Object.getOwnPropertyNames\n  ? Object.getOwnPropertyNames(window) : [];\n\nvar getWindowNames = function (it) {\n  try {\n    return gOPN(it);\n  } catch (e) {\n    return windowNames.slice();\n  }\n};\n\nmodule.exports.f = function getOwnPropertyNames(it) {\n  return windowNames && toString.call(it) == '[object Window]' ? getWindowNames(it) : gOPN(toIObject(it));\n};\n","// 19.1.2.7 / 15.2.3.4 Object.getOwnPropertyNames(O)\nvar $keys = require('./_object-keys-internal');\nvar hiddenKeys = require('./_enum-bug-keys').concat('length', 'prototype');\n\nexports.f = Object.getOwnPropertyNames || function getOwnPropertyNames(O) {\n  return $keys(O, hiddenKeys);\n};\n","require('../../modules/es7.string.pad-start');\nmodule.exports = require('../../modules/_core').String.padStart;\n","'use strict';\n// https://github.com/tc39/proposal-string-pad-start-end\nvar $export = require('./_export');\nvar $pad = require('./_string-pad');\nvar userAgent = require('./_user-agent');\n\n// https://github.com/zloirock/core-js/issues/280\n$export($export.P + $export.F * /Version\\/10\\.\\d+(\\.\\d+)? Safari\\//.test(userAgent), 'String', {\n  padStart: function padStart(maxLength /* , fillString = ' ' */) {\n    return $pad(this, maxLength, arguments.length > 1 ? arguments[1] : undefined, true);\n  }\n});\n","// https://github.com/tc39/proposal-string-pad-start-end\nvar toLength = require('./_to-length');\nvar repeat = require('./_string-repeat');\nvar defined = require('./_defined');\n\nmodule.exports = function (that, maxLength, fillString, left) {\n  var S = String(defined(that));\n  var stringLength = S.length;\n  var fillStr = fillString === undefined ? ' ' : String(fillString);\n  var intMaxLength = toLength(maxLength);\n  if (intMaxLength <= stringLength || fillStr == '') return S;\n  var fillLen = intMaxLength - stringLength;\n  var stringFiller = repeat.call(fillStr, Math.ceil(fillLen / fillStr.length));\n  if (stringFiller.length > fillLen) stringFiller = stringFiller.slice(0, fillLen);\n  return left ? stringFiller + S : S + stringFiller;\n};\n","'use strict';\nvar toInteger = require('./_to-integer');\nvar defined = require('./_defined');\n\nmodule.exports = function repeat(count) {\n  var str = String(defined(this));\n  var res = '';\n  var n = toInteger(count);\n  if (n < 0 || n == Infinity) throw RangeError(\"Count can't be negative\");\n  for (;n > 0; (n >>>= 1) && (str += str)) if (n & 1) res += str;\n  return res;\n};\n","require('../../modules/es7.string.pad-end');\nmodule.exports = require('../../modules/_core').String.padEnd;\n","'use strict';\n// https://github.com/tc39/proposal-string-pad-start-end\nvar $export = require('./_export');\nvar $pad = require('./_string-pad');\nvar userAgent = require('./_user-agent');\n\n// https://github.com/zloirock/core-js/issues/280\n$export($export.P + $export.F * /Version\\/10\\.\\d+(\\.\\d+)? Safari\\//.test(userAgent), 'String', {\n  padEnd: function padEnd(maxLength /* , fillString = ' ' */) {\n    return $pad(this, maxLength, arguments.length > 1 ? arguments[1] : undefined, false);\n  }\n});\n","require('../../modules/es7.object.values');\nmodule.exports = require('../../modules/_core').Object.values;\n","// https://github.com/tc39/proposal-object-values-entries\nvar $export = require('./_export');\nvar $values = require('./_object-to-array')(false);\n\n$export($export.S, 'Object', {\n  values: function values(it) {\n    return $values(it);\n  }\n});\n","var getKeys = require('./_object-keys');\nvar toIObject = require('./_to-iobject');\nvar isEnum = require('./_object-pie').f;\nmodule.exports = function (isEntries) {\n  return function (it) {\n    var O = toIObject(it);\n    var keys = getKeys(O);\n    var length = keys.length;\n    var i = 0;\n    var result = [];\n    var key;\n    while (length > i) if (isEnum.call(O, key = keys[i++])) {\n      result.push(isEntries ? [key, O[key]] : O[key]);\n    } return result;\n  };\n};\n","/* Copyright 2017 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n/* eslint-disable no-restricted-globals */\n\nif (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('MOZCENTRAL')) {\n  if (typeof ReadableStream === 'undefined') {\n    throw new Error('Please enable ReadableStream support by resetting the ' +\n      '\"javascript.options.streams\" preference to \"true\" in about:config.');\n  }\n  exports.ReadableStream = ReadableStream;\n} else {\n  let isReadableStreamSupported = false;\n  if (typeof ReadableStream !== 'undefined') {\n    // MS Edge may say it has ReadableStream but they are not up to spec yet.\n    try {\n      // eslint-disable-next-line no-new\n      new ReadableStream({\n        start(controller) {\n          controller.close();\n        },\n      });\n      isReadableStreamSupported = true;\n    } catch (e) {\n      // The ReadableStream constructor cannot be used.\n    }\n  }\n  if (isReadableStreamSupported) {\n    exports.ReadableStream = ReadableStream;\n  } else if (typeof PDFJSDev !== 'undefined' &&\n             PDFJSDev.test('IMAGE_DECODERS')) {\n    class DummyReadableStream {\n      constructor() {\n        throw new Error('The current image decoders are synchronous, ' +\n                        'hence `ReadableStream` shouldn\\'t need to be ' +\n                        'polyfilled for the IMAGE_DECODERS build target.');\n      }\n    }\n    exports.ReadableStream = DummyReadableStream;\n  } else {\n    exports.ReadableStream =\n      require('../../external/streams/streams-lib').ReadableStream;\n  }\n}\n","/*\n * To the extent possible under law, the authors have dedicated all copyright\n * and related and neighboring rights to this software to the public\n * domain worldwide. This software is distributed without any warranty.\n *\n * You should have received a copy of the CC0 Public Domain Dedication along\n * with this software. If not, see https://creativecommons.org/publicdomain/zero/1.0/.\n */\n\n(function(e, a) { for(var i in a) e[i] = a[i]; }(exports, /******/ (function(modules) { // webpackBootstrap\n/******/  // The module cache\n/******/  var installedModules = {};\n/******/\n/******/  // The require function\n/******/  function __w_pdfjs_require__(moduleId) {\n/******/\n/******/    // Check if module is in cache\n/******/    if(installedModules[moduleId])\n/******/      return installedModules[moduleId].exports;\n/******/\n/******/    // Create a new module (and put it into the cache)\n/******/    var module = installedModules[moduleId] = {\n/******/      i: moduleId,\n/******/      l: false,\n/******/      exports: {}\n/******/    };\n/******/\n/******/    // Execute the module function\n/******/    modules[moduleId].call(module.exports, module, module.exports, __w_pdfjs_require__);\n/******/\n/******/    // Flag the module as loaded\n/******/    module.l = true;\n/******/\n/******/    // Return the exports of the module\n/******/    return module.exports;\n/******/  }\n/******/\n/******/\n/******/  // expose the modules object (__webpack_modules__)\n/******/  __w_pdfjs_require__.m = modules;\n/******/\n/******/  // expose the module cache\n/******/  __w_pdfjs_require__.c = installedModules;\n/******/\n/******/  // identity function for calling harmony imports with the correct context\n/******/  __w_pdfjs_require__.i = function(value) { return value; };\n/******/\n/******/  // define getter function for harmony exports\n/******/  __w_pdfjs_require__.d = function(exports, name, getter) {\n/******/    if(!__w_pdfjs_require__.o(exports, name)) {\n/******/      Object.defineProperty(exports, name, {\n/******/        configurable: false,\n/******/        enumerable: true,\n/******/        get: getter\n/******/      });\n/******/    }\n/******/  };\n/******/\n/******/  // getDefaultExport function for compatibility with non-harmony modules\n/******/  __w_pdfjs_require__.n = function(module) {\n/******/    var getter = module && module.__esModule ?\n/******/      function getDefault() { return module['default']; } :\n/******/      function getModuleExports() { return module; };\n/******/    __w_pdfjs_require__.d(getter, 'a', getter);\n/******/    return getter;\n/******/  };\n/******/\n/******/  // Object.prototype.hasOwnProperty.call\n/******/  __w_pdfjs_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); };\n/******/\n/******/  // __webpack_public_path__\n/******/  __w_pdfjs_require__.p = \"\";\n/******/\n/******/  // Load entry module and return exports\n/******/  return __w_pdfjs_require__(__w_pdfjs_require__.s = 7);\n/******/ })\n/************************************************************************/\n/******/ ([\n/* 0 */\n/***/ (function(module, exports, __w_pdfjs_require__) {\n\n\"use strict\";\n\n\nvar _typeof = typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; };\n\nvar _require = __w_pdfjs_require__(1),\n    assert = _require.assert;\n\nfunction IsPropertyKey(argument) {\n  return typeof argument === 'string' || (typeof argument === 'undefined' ? 'undefined' : _typeof(argument)) === 'symbol';\n}\n\nexports.typeIsObject = function (x) {\n  return (typeof x === 'undefined' ? 'undefined' : _typeof(x)) === 'object' && x !== null || typeof x === 'function';\n};\n\nexports.createDataProperty = function (o, p, v) {\n  assert(exports.typeIsObject(o));\n  Object.defineProperty(o, p, { value: v, writable: true, enumerable: true, configurable: true });\n};\n\nexports.createArrayFromList = function (elements) {\n  // We use arrays to represent lists, so this is basically a no-op.\n  // Do a slice though just in case we happen to depend on the unique-ness.\n  return elements.slice();\n};\n\nexports.ArrayBufferCopy = function (dest, destOffset, src, srcOffset, n) {\n  new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);\n};\n\nexports.CreateIterResultObject = function (value, done) {\n  assert(typeof done === 'boolean');\n  var obj = {};\n  Object.defineProperty(obj, 'value', { value: value, enumerable: true, writable: true, configurable: true });\n  Object.defineProperty(obj, 'done', { value: done, enumerable: true, writable: true, configurable: true });\n  return obj;\n};\n\nexports.IsFiniteNonNegativeNumber = function (v) {\n  if (Number.isNaN(v)) {\n    return false;\n  }\n  if (v === Infinity) {\n    return false;\n  }\n  if (v < 0) {\n    return false;\n  }\n\n  return true;\n};\n\nfunction Call(F, V, args) {\n  if (typeof F !== 'function') {\n    throw new TypeError('Argument is not a function');\n  }\n\n  return Function.prototype.apply.call(F, V, args);\n}\n\nexports.InvokeOrNoop = function (O, P, args) {\n  assert(O !== undefined);\n  assert(IsPropertyKey(P));\n  assert(Array.isArray(args));\n\n  var method = O[P];\n  if (method === undefined) {\n    return undefined;\n  }\n\n  return Call(method, O, args);\n};\n\nexports.PromiseInvokeOrNoop = function (O, P, args) {\n  assert(O !== undefined);\n  assert(IsPropertyKey(P));\n  assert(Array.isArray(args));\n  try {\n    return Promise.resolve(exports.InvokeOrNoop(O, P, args));\n  } catch (returnValueE) {\n    return Promise.reject(returnValueE);\n  }\n};\n\nexports.PromiseInvokeOrPerformFallback = function (O, P, args, F, argsF) {\n  assert(O !== undefined);\n  assert(IsPropertyKey(P));\n  assert(Array.isArray(args));\n  assert(Array.isArray(argsF));\n\n  var method = void 0;\n  try {\n    method = O[P];\n  } catch (methodE) {\n    return Promise.reject(methodE);\n  }\n\n  if (method === undefined) {\n    return F.apply(null, argsF);\n  }\n\n  try {\n    return Promise.resolve(Call(method, O, args));\n  } catch (e) {\n    return Promise.reject(e);\n  }\n};\n\n// Not implemented correctly\nexports.TransferArrayBuffer = function (O) {\n  return O.slice();\n};\n\nexports.ValidateAndNormalizeHighWaterMark = function (highWaterMark) {\n  highWaterMark = Number(highWaterMark);\n  if (Number.isNaN(highWaterMark) || highWaterMark < 0) {\n    throw new RangeError('highWaterMark property of a queuing strategy must be non-negative and non-NaN');\n  }\n\n  return highWaterMark;\n};\n\nexports.ValidateAndNormalizeQueuingStrategy = function (size, highWaterMark) {\n  if (size !== undefined && typeof size !== 'function') {\n    throw new TypeError('size property of a queuing strategy must be a function');\n  }\n\n  highWaterMark = exports.ValidateAndNormalizeHighWaterMark(highWaterMark);\n\n  return { size: size, highWaterMark: highWaterMark };\n};\n\n/***/ }),\n/* 1 */\n/***/ (function(module, exports, __w_pdfjs_require__) {\n\n\"use strict\";\n\n\nfunction rethrowAssertionErrorRejection(e) {\n  // Used throughout the reference implementation, as `.catch(rethrowAssertionErrorRejection)`, to ensure any errors\n  // get shown. There are places in the spec where we do promise transformations and purposefully ignore or don't\n  // expect any errors, but assertion errors are always problematic.\n  if (e && e.constructor === AssertionError) {\n    setTimeout(function () {\n      throw e;\n    }, 0);\n  }\n};\n\nfunction AssertionError(message) {\n  this.name = 'AssertionError';\n  this.message = message || '';\n  this.stack = new Error().stack;\n}\nAssertionError.prototype = Object.create(Error.prototype);\nAssertionError.prototype.constructor = AssertionError;\n\nfunction assert(value, message) {\n  if (!value) {\n    throw new AssertionError(message);\n  }\n}\n\nmodule.exports = {\n  rethrowAssertionErrorRejection: rethrowAssertionErrorRejection,\n  AssertionError: AssertionError,\n  assert: assert\n};\n\n/***/ }),\n/* 2 */\n/***/ (function(module, exports, __w_pdfjs_require__) {\n\n\"use strict\";\n\n\nvar _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if (\"value\" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();\n\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nvar _require = __w_pdfjs_require__(0),\n    InvokeOrNoop = _require.InvokeOrNoop,\n    PromiseInvokeOrNoop = _require.PromiseInvokeOrNoop,\n    ValidateAndNormalizeQueuingStrategy = _require.ValidateAndNormalizeQueuingStrategy,\n    typeIsObject = _require.typeIsObject;\n\nvar _require2 = __w_pdfjs_require__(1),\n    assert = _require2.assert,\n    rethrowAssertionErrorRejection = _require2.rethrowAssertionErrorRejection;\n\nvar _require3 = __w_pdfjs_require__(3),\n    DequeueValue = _require3.DequeueValue,\n    EnqueueValueWithSize = _require3.EnqueueValueWithSize,\n    PeekQueueValue = _require3.PeekQueueValue,\n    ResetQueue = _require3.ResetQueue;\n\nvar WritableStream = function () {\n  function WritableStream() {\n    var underlyingSink = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};\n\n    var _ref = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {},\n        size = _ref.size,\n        _ref$highWaterMark = _ref.highWaterMark,\n        highWaterMark = _ref$highWaterMark === undefined ? 1 : _ref$highWaterMark;\n\n    _classCallCheck(this, WritableStream);\n\n    this._state = 'writable';\n\n    // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is\n    // 'erroring' or 'errored'. May be set to an undefined value.\n    this._storedError = undefined;\n\n    this._writer = undefined;\n\n    // Initialize to undefined first because the constructor of the controller checks this\n    // variable to validate the caller.\n    this._writableStreamController = undefined;\n\n    // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data\n    // producer without waiting for the queued writes to finish.\n    this._writeRequests = [];\n\n    // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents\n    // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.\n    this._inFlightWriteRequest = undefined;\n\n    // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer\n    // has been detached.\n    this._closeRequest = undefined;\n\n    // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it\n    // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.\n    this._inFlightCloseRequest = undefined;\n\n    // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.\n    this._pendingAbortRequest = undefined;\n\n    // The backpressure signal set by the controller.\n    this._backpressure = false;\n\n    var type = underlyingSink.type;\n\n    if (type !== undefined) {\n      throw new RangeError('Invalid type is specified');\n    }\n\n    this._writableStreamController = new WritableStreamDefaultController(this, underlyingSink, size, highWaterMark);\n    this._writableStreamController.__startSteps();\n  }\n\n  _createClass(WritableStream, [{\n    key: 'abort',\n    value: function abort(reason) {\n      if (IsWritableStream(this) === false) {\n        return Promise.reject(streamBrandCheckException('abort'));\n      }\n\n      if (IsWritableStreamLocked(this) === true) {\n        return Promise.reject(new TypeError('Cannot abort a stream that already has a writer'));\n      }\n\n      return WritableStreamAbort(this, reason);\n    }\n  }, {\n    key: 'getWriter',\n    value: function getWriter() {\n      if (IsWritableStream(this) === false) {\n        throw streamBrandCheckException('getWriter');\n      }\n\n      return AcquireWritableStreamDefaultWriter(this);\n    }\n  }, {\n    key: 'locked',\n    get: function get() {\n      if (IsWritableStream(this) === false) {\n        throw streamBrandCheckException('locked');\n      }\n\n      return IsWritableStreamLocked(this);\n    }\n  }]);\n\n  return WritableStream;\n}();\n\nmodule.exports = {\n  AcquireWritableStreamDefaultWriter: AcquireWritableStreamDefaultWriter,\n  IsWritableStream: IsWritableStream,\n  IsWritableStreamLocked: IsWritableStreamLocked,\n  WritableStream: WritableStream,\n  WritableStreamAbort: WritableStreamAbort,\n  WritableStreamDefaultControllerError: WritableStreamDefaultControllerError,\n  WritableStreamDefaultWriterCloseWithErrorPropagation: WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease: WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite: WritableStreamDefaultWriterWrite,\n  WritableStreamCloseQueuedOrInFlight: WritableStreamCloseQueuedOrInFlight\n};\n\n// Abstract operations for the WritableStream.\n\nfunction AcquireWritableStreamDefaultWriter(stream) {\n  return new WritableStreamDefaultWriter(stream);\n}\n\nfunction IsWritableStream(x) {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction IsWritableStreamLocked(stream) {\n  assert(IsWritableStream(stream) === true, 'IsWritableStreamLocked should only be used on known writable streams');\n\n  if (stream._writer === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamAbort(stream, reason) {\n  var state = stream._state;\n  if (state === 'closed') {\n    return Promise.resolve(undefined);\n  }\n  if (state === 'errored') {\n    return Promise.reject(stream._storedError);\n  }\n  var error = new TypeError('Requested to abort');\n  if (stream._pendingAbortRequest !== undefined) {\n    return Promise.reject(error);\n  }\n\n  assert(state === 'writable' || state === 'erroring', 'state must be writable or erroring');\n\n  var wasAlreadyErroring = false;\n  if (state === 'erroring') {\n    wasAlreadyErroring = true;\n    // reason will not be used, so don't keep a reference to it.\n    reason = undefined;\n  }\n\n  var promise = new Promise(function (resolve, reject) {\n    stream._pendingAbortRequest = {\n      _resolve: resolve,\n      _reject: reject,\n      _reason: reason,\n      _wasAlreadyErroring: wasAlreadyErroring\n    };\n  });\n\n  if (wasAlreadyErroring === false) {\n    WritableStreamStartErroring(stream, error);\n  }\n\n  return promise;\n}\n\n// WritableStream API exposed for controllers.\n\nfunction WritableStreamAddWriteRequest(stream) {\n  assert(IsWritableStreamLocked(stream) === true);\n  assert(stream._state === 'writable');\n\n  var promise = new Promise(function (resolve, reject) {\n    var writeRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._writeRequests.push(writeRequest);\n  });\n\n  return promise;\n}\n\nfunction WritableStreamDealWithRejection(stream, error) {\n  var state = stream._state;\n\n  if (state === 'writable') {\n    WritableStreamStartErroring(stream, error);\n    return;\n  }\n\n  assert(state === 'erroring');\n  WritableStreamFinishErroring(stream);\n}\n\nfunction WritableStreamStartErroring(stream, reason) {\n  assert(stream._storedError === undefined, 'stream._storedError === undefined');\n  assert(stream._state === 'writable', 'state must be writable');\n\n  var controller = stream._writableStreamController;\n  assert(controller !== undefined, 'controller must not be undefined');\n\n  stream._state = 'erroring';\n  stream._storedError = reason;\n  var writer = stream._writer;\n  if (writer !== undefined) {\n    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);\n  }\n\n  if (WritableStreamHasOperationMarkedInFlight(stream) === false && controller._started === true) {\n    WritableStreamFinishErroring(stream);\n  }\n}\n\nfunction WritableStreamFinishErroring(stream) {\n  assert(stream._state === 'erroring', 'stream._state === erroring');\n  assert(WritableStreamHasOperationMarkedInFlight(stream) === false, 'WritableStreamHasOperationMarkedInFlight(stream) === false');\n  stream._state = 'errored';\n  stream._writableStreamController.__errorSteps();\n\n  var storedError = stream._storedError;\n  for (var i = 0; i < stream._writeRequests.length; i++) {\n    var writeRequest = stream._writeRequests[i];\n    writeRequest._reject(storedError);\n  }\n  stream._writeRequests = [];\n\n  if (stream._pendingAbortRequest === undefined) {\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  var abortRequest = stream._pendingAbortRequest;\n  stream._pendingAbortRequest = undefined;\n\n  if (abortRequest._wasAlreadyErroring === true) {\n    abortRequest._reject(storedError);\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  var promise = stream._writableStreamController.__abortSteps(abortRequest._reason);\n  promise.then(function () {\n    abortRequest._resolve();\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n  }, function (reason) {\n    abortRequest._reject(reason);\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n  });\n}\n\nfunction WritableStreamFinishInFlightWrite(stream) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest._resolve(undefined);\n  stream._inFlightWriteRequest = undefined;\n}\n\nfunction WritableStreamFinishInFlightWriteWithError(stream, error) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest._reject(error);\n  stream._inFlightWriteRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  WritableStreamDealWithRejection(stream, error);\n}\n\nfunction WritableStreamFinishInFlightClose(stream) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest._resolve(undefined);\n  stream._inFlightCloseRequest = undefined;\n\n  var state = stream._state;\n\n  assert(state === 'writable' || state === 'erroring');\n\n  if (state === 'erroring') {\n    // The error was too late to do anything, so it is ignored.\n    stream._storedError = undefined;\n    if (stream._pendingAbortRequest !== undefined) {\n      stream._pendingAbortRequest._resolve();\n      stream._pendingAbortRequest = undefined;\n    }\n  }\n\n  stream._state = 'closed';\n\n  var writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseResolve(writer);\n  }\n\n  assert(stream._pendingAbortRequest === undefined, 'stream._pendingAbortRequest === undefined');\n  assert(stream._storedError === undefined, 'stream._storedError === undefined');\n}\n\nfunction WritableStreamFinishInFlightCloseWithError(stream, error) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest._reject(error);\n  stream._inFlightCloseRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  // Never execute sink abort() after sink close().\n  if (stream._pendingAbortRequest !== undefined) {\n    stream._pendingAbortRequest._reject(error);\n    stream._pendingAbortRequest = undefined;\n  }\n  WritableStreamDealWithRejection(stream, error);\n}\n\n// TODO(ricea): Fix alphabetical order.\nfunction WritableStreamCloseQueuedOrInFlight(stream) {\n  if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamHasOperationMarkedInFlight(stream) {\n  if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamMarkCloseRequestInFlight(stream) {\n  assert(stream._inFlightCloseRequest === undefined);\n  assert(stream._closeRequest !== undefined);\n  stream._inFlightCloseRequest = stream._closeRequest;\n  stream._closeRequest = undefined;\n}\n\nfunction WritableStreamMarkFirstWriteRequestInFlight(stream) {\n  assert(stream._inFlightWriteRequest === undefined, 'there must be no pending write request');\n  assert(stream._writeRequests.length !== 0, 'writeRequests must not be empty');\n  stream._inFlightWriteRequest = stream._writeRequests.shift();\n}\n\nfunction WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {\n  assert(stream._state === 'errored', '_stream_.[[state]] is `\"errored\"`');\n  if (stream._closeRequest !== undefined) {\n    assert(stream._inFlightCloseRequest === undefined);\n\n    stream._closeRequest._reject(stream._storedError);\n    stream._closeRequest = undefined;\n  }\n  var writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseReject(writer, stream._storedError);\n    writer._closedPromise.catch(function () {});\n  }\n}\n\nfunction WritableStreamUpdateBackpressure(stream, backpressure) {\n  assert(stream._state === 'writable');\n  assert(WritableStreamCloseQueuedOrInFlight(stream) === false);\n\n  var writer = stream._writer;\n  if (writer !== undefined && backpressure !== stream._backpressure) {\n    if (backpressure === true) {\n      defaultWriterReadyPromiseReset(writer);\n    } else {\n      assert(backpressure === false);\n\n      defaultWriterReadyPromiseResolve(writer);\n    }\n  }\n\n  stream._backpressure = backpressure;\n}\n\nvar WritableStreamDefaultWriter = function () {\n  function WritableStreamDefaultWriter(stream) {\n    _classCallCheck(this, WritableStreamDefaultWriter);\n\n    if (IsWritableStream(stream) === false) {\n      throw new TypeError('WritableStreamDefaultWriter can only be constructed with a WritableStream instance');\n    }\n    if (IsWritableStreamLocked(stream) === true) {\n      throw new TypeError('This stream has already been locked for exclusive writing by another writer');\n    }\n\n    this._ownerWritableStream = stream;\n    stream._writer = this;\n\n    var state = stream._state;\n\n    if (state === 'writable') {\n      if (WritableStreamCloseQueuedOrInFlight(stream) === false && stream._backpressure === true) {\n        defaultWriterReadyPromiseInitialize(this);\n      } else {\n        defaultWriterReadyPromiseInitializeAsResolved(this);\n      }\n\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'erroring') {\n      defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);\n      this._readyPromise.catch(function () {});\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'closed') {\n      defaultWriterReadyPromiseInitializeAsResolved(this);\n      defaultWriterClosedPromiseInitializeAsResolved(this);\n    } else {\n      assert(state === 'errored', 'state must be errored');\n\n      var storedError = stream._storedError;\n      defaultWriterReadyPromiseInitializeAsRejected(this, storedError);\n      this._readyPromise.catch(function () {});\n      defaultWriterClosedPromiseInitializeAsRejected(this, storedError);\n      this._closedPromise.catch(function () {});\n    }\n  }\n\n  _createClass(WritableStreamDefaultWriter, [{\n    key: 'abort',\n    value: function abort(reason) {\n      if (IsWritableStreamDefaultWriter(this) === false) {\n        return Promise.reject(defaultWriterBrandCheckException('abort'));\n      }\n\n      if (this._ownerWritableStream === undefined) {\n        return Promise.reject(defaultWriterLockException('abort'));\n      }\n\n      return WritableStreamDefaultWriterAbort(this, reason);\n    }\n  }, {\n    key: 'close',\n    value: function close() {\n      if (IsWritableStreamDefaultWriter(this) === false) {\n        return Promise.reject(defaultWriterBrandCheckException('close'));\n      }\n\n      var stream = this._ownerWritableStream;\n\n      if (stream === undefined) {\n        return Promise.reject(defaultWriterLockException('close'));\n      }\n\n      if (WritableStreamCloseQueuedOrInFlight(stream) === true) {\n        return Promise.reject(new TypeError('cannot close an already-closing stream'));\n      }\n\n      return WritableStreamDefaultWriterClose(this);\n    }\n  }, {\n    key: 'releaseLock',\n    value: function releaseLock() {\n      if (IsWritableStreamDefaultWriter(this) === false) {\n        throw defaultWriterBrandCheckException('releaseLock');\n      }\n\n      var stream = this._ownerWritableStream;\n\n      if (stream === undefined) {\n        return;\n      }\n\n      assert(stream._writer !== undefined);\n\n      WritableStreamDefaultWriterRelease(this);\n    }\n  }, {\n    key: 'write',\n    value: function write(chunk) {\n      if (IsWritableStreamDefaultWriter(this) === false) {\n        return Promise.reject(defaultWriterBrandCheckException('write'));\n      }\n\n      if (this._ownerWritableStream === undefined) {\n        return Promise.reject(defaultWriterLockException('write to'));\n      }\n\n      return WritableStreamDefaultWriterWrite(this, chunk);\n    }\n  }, {\n    key: 'closed',\n    get: function get() {\n      if (IsWritableStreamDefaultWriter(this) === false) {\n        return Promise.reject(defaultWriterBrandCheckException('closed'));\n      }\n\n      return this._closedPromise;\n    }\n  }, {\n    key: 'desiredSize',\n    get: function get() {\n      if (IsWritableStreamDefaultWriter(this) === false) {\n        throw defaultWriterBrandCheckException('desiredSize');\n      }\n\n      if (this._ownerWritableStream === undefined) {\n        throw defaultWriterLockException('desiredSize');\n      }\n\n      return WritableStreamDefaultWriterGetDesiredSize(this);\n    }\n  }, {\n    key: 'ready',\n    get: function get() {\n      if (IsWritableStreamDefaultWriter(this) === false) {\n        return Promise.reject(defaultWriterBrandCheckException('ready'));\n      }\n\n      return this._readyPromise;\n    }\n  }]);\n\n  return WritableStreamDefaultWriter;\n}();\n\n// Abstract operations for the WritableStreamDefaultWriter.\n\nfunction IsWritableStreamDefaultWriter(x) {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {\n    return false;\n  }\n\n  return true;\n}\n\n// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultWriterAbort(writer, reason) {\n  var stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamAbort(stream, reason);\n}\n\nfunction WritableStreamDefaultWriterClose(writer) {\n  var stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  var state = stream._state;\n  if (state === 'closed' || state === 'errored') {\n    return Promise.reject(new TypeError('The stream (in ' + state + ' state) is not in the writable state and cannot be closed'));\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n  assert(WritableStreamCloseQueuedOrInFlight(stream) === false);\n\n  var promise = new Promise(function (resolve, reject) {\n    var closeRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._closeRequest = closeRequest;\n  });\n\n  if (stream._backpressure === true && state === 'writable') {\n    defaultWriterReadyPromiseResolve(writer);\n  }\n\n  WritableStreamDefaultControllerClose(stream._writableStreamController);\n\n  return promise;\n}\n\nfunction WritableStreamDefaultWriterCloseWithErrorPropagation(writer) {\n  var stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  var state = stream._state;\n  if (WritableStreamCloseQueuedOrInFlight(stream) === true || state === 'closed') {\n    return Promise.resolve();\n  }\n\n  if (state === 'errored') {\n    return Promise.reject(stream._storedError);\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  return WritableStreamDefaultWriterClose(writer);\n}\n\nfunction WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, error) {\n  if (writer._closedPromiseState === 'pending') {\n    defaultWriterClosedPromiseReject(writer, error);\n  } else {\n    defaultWriterClosedPromiseResetToRejected(writer, error);\n  }\n  writer._closedPromise.catch(function () {});\n}\n\nfunction WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, error) {\n  if (writer._readyPromiseState === 'pending') {\n    defaultWriterReadyPromiseReject(writer, error);\n  } else {\n    defaultWriterReadyPromiseResetToRejected(writer, error);\n  }\n  writer._readyPromise.catch(function () {});\n}\n\nfunction WritableStreamDefaultWriterGetDesiredSize(writer) {\n  var stream = writer._ownerWritableStream;\n  var state = stream._state;\n\n  if (state === 'errored' || state === 'erroring') {\n    return null;\n  }\n\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);\n}\n\nfunction WritableStreamDefaultWriterRelease(writer) {\n  var stream = writer._ownerWritableStream;\n  assert(stream !== undefined);\n  assert(stream._writer === writer);\n\n  var releasedError = new TypeError('Writer was released and can no longer be used to monitor the stream\\'s closedness');\n\n  WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);\n\n  // The state transitions to \"errored\" before the sink abort() method runs, but the writer.closed promise is not\n  // rejected until afterwards. This means that simply testing state will not work.\n  WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);\n\n  stream._writer = undefined;\n  writer._ownerWritableStream = undefined;\n}\n\nfunction WritableStreamDefaultWriterWrite(writer, chunk) {\n  var stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  var controller = stream._writableStreamController;\n\n  var chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);\n\n  if (stream !== writer._ownerWritableStream) {\n    return Promise.reject(defaultWriterLockException('write to'));\n  }\n\n  var state = stream._state;\n  if (state === 'errored') {\n    return Promise.reject(stream._storedError);\n  }\n  if (WritableStreamCloseQueuedOrInFlight(stream) === true || state === 'closed') {\n    return Promise.reject(new TypeError('The stream is closing or closed and cannot be written to'));\n  }\n  if (state === 'erroring') {\n    return Promise.reject(stream._storedError);\n  }\n\n  assert(state === 'writable');\n\n  var promise = WritableStreamAddWriteRequest(stream);\n\n  WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);\n\n  return promise;\n}\n\nvar WritableStreamDefaultController = function () {\n  function WritableStreamDefaultController(stream, underlyingSink, size, highWaterMark) {\n    _classCallCheck(this, WritableStreamDefaultController);\n\n    if (IsWritableStream(stream) === false) {\n      throw new TypeError('WritableStreamDefaultController can only be constructed with a WritableStream instance');\n    }\n\n    if (stream._writableStreamController !== undefined) {\n      throw new TypeError('WritableStreamDefaultController instances can only be created by the WritableStream constructor');\n    }\n\n    this._controlledWritableStream = stream;\n\n    this._underlyingSink = underlyingSink;\n\n    // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n    this._queue = undefined;\n    this._queueTotalSize = undefined;\n    ResetQueue(this);\n\n    this._started = false;\n\n    var normalizedStrategy = ValidateAndNormalizeQueuingStrategy(size, highWaterMark);\n    this._strategySize = normalizedStrategy.size;\n    this._strategyHWM = normalizedStrategy.highWaterMark;\n\n    var backpressure = WritableStreamDefaultControllerGetBackpressure(this);\n    WritableStreamUpdateBackpressure(stream, backpressure);\n  }\n\n  _createClass(WritableStreamDefaultController, [{\n    key: 'error',\n    value: function error(e) {\n      if (IsWritableStreamDefaultController(this) === false) {\n        throw new TypeError('WritableStreamDefaultController.prototype.error can only be used on a WritableStreamDefaultController');\n      }\n      var state = this._controlledWritableStream._state;\n      if (state !== 'writable') {\n        // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so\n        // just treat it as a no-op.\n        return;\n      }\n\n      WritableStreamDefaultControllerError(this, e);\n    }\n  }, {\n    key: '__abortSteps',\n    value: function __abortSteps(reason) {\n      return PromiseInvokeOrNoop(this._underlyingSink, 'abort', [reason]);\n    }\n  }, {\n    key: '__errorSteps',\n    value: function __errorSteps() {\n      ResetQueue(this);\n    }\n  }, {\n    key: '__startSteps',\n    value: function __startSteps() {\n      var _this = this;\n\n      var startResult = InvokeOrNoop(this._underlyingSink, 'start', [this]);\n      var stream = this._controlledWritableStream;\n\n      Promise.resolve(startResult).then(function () {\n        assert(stream._state === 'writable' || stream._state === 'erroring');\n        _this._started = true;\n        WritableStreamDefaultControllerAdvanceQueueIfNeeded(_this);\n      }, function (r) {\n        assert(stream._state === 'writable' || stream._state === 'erroring');\n        _this._started = true;\n        WritableStreamDealWithRejection(stream, r);\n      }).catch(rethrowAssertionErrorRejection);\n    }\n  }]);\n\n  return WritableStreamDefaultController;\n}();\n\n// Abstract operations implementing interface required by the WritableStream.\n\nfunction WritableStreamDefaultControllerClose(controller) {\n  EnqueueValueWithSize(controller, 'close', 0);\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\nfunction WritableStreamDefaultControllerGetChunkSize(controller, chunk) {\n  var strategySize = controller._strategySize;\n\n  if (strategySize === undefined) {\n    return 1;\n  }\n\n  try {\n    return strategySize(chunk);\n  } catch (chunkSizeE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);\n    return 1;\n  }\n}\n\nfunction WritableStreamDefaultControllerGetDesiredSize(controller) {\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nfunction WritableStreamDefaultControllerWrite(controller, chunk, chunkSize) {\n  var writeRecord = { chunk: chunk };\n\n  try {\n    EnqueueValueWithSize(controller, writeRecord, chunkSize);\n  } catch (enqueueE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);\n    return;\n  }\n\n  var stream = controller._controlledWritableStream;\n  if (WritableStreamCloseQueuedOrInFlight(stream) === false && stream._state === 'writable') {\n    var backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n    WritableStreamUpdateBackpressure(stream, backpressure);\n  }\n\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\n// Abstract operations for the WritableStreamDefaultController.\n\nfunction IsWritableStreamDefaultController(x) {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_underlyingSink')) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {\n  var stream = controller._controlledWritableStream;\n\n  if (controller._started === false) {\n    return;\n  }\n\n  if (stream._inFlightWriteRequest !== undefined) {\n    return;\n  }\n\n  var state = stream._state;\n  if (state === 'closed' || state === 'errored') {\n    return;\n  }\n  if (state === 'erroring') {\n    WritableStreamFinishErroring(stream);\n    return;\n  }\n\n  if (controller._queue.length === 0) {\n    return;\n  }\n\n  var writeRecord = PeekQueueValue(controller);\n  if (writeRecord === 'close') {\n    WritableStreamDefaultControllerProcessClose(controller);\n  } else {\n    WritableStreamDefaultControllerProcessWrite(controller, writeRecord.chunk);\n  }\n}\n\nfunction WritableStreamDefaultControllerErrorIfNeeded(controller, error) {\n  if (controller._controlledWritableStream._state === 'writable') {\n    WritableStreamDefaultControllerError(controller, error);\n  }\n}\n\nfunction WritableStreamDefaultControllerProcessClose(controller) {\n  var stream = controller._controlledWritableStream;\n\n  WritableStreamMarkCloseRequestInFlight(stream);\n\n  DequeueValue(controller);\n  assert(controller._queue.length === 0, 'queue must be empty once the final write record is dequeued');\n\n  var sinkClosePromise = PromiseInvokeOrNoop(controller._underlyingSink, 'close', []);\n  sinkClosePromise.then(function () {\n    WritableStreamFinishInFlightClose(stream);\n  }, function (reason) {\n    WritableStreamFinishInFlightCloseWithError(stream, reason);\n  }).catch(rethrowAssertionErrorRejection);\n}\n\nfunction WritableStreamDefaultControllerProcessWrite(controller, chunk) {\n  var stream = controller._controlledWritableStream;\n\n  WritableStreamMarkFirstWriteRequestInFlight(stream);\n\n  var sinkWritePromise = PromiseInvokeOrNoop(controller._underlyingSink, 'write', [chunk, controller]);\n  sinkWritePromise.then(function () {\n    WritableStreamFinishInFlightWrite(stream);\n\n    var state = stream._state;\n    assert(state === 'writable' || state === 'erroring');\n\n    DequeueValue(controller);\n\n    if (WritableStreamCloseQueuedOrInFlight(stream) === false && state === 'writable') {\n      var backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n      WritableStreamUpdateBackpressure(stream, backpressure);\n    }\n\n    WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n  }, function (reason) {\n    WritableStreamFinishInFlightWriteWithError(stream, reason);\n  }).catch(rethrowAssertionErrorRejection);\n}\n\nfunction WritableStreamDefaultControllerGetBackpressure(controller) {\n  var desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);\n  return desiredSize <= 0;\n}\n\n// A client of WritableStreamDefaultController may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultControllerError(controller, error) {\n  var stream = controller._controlledWritableStream;\n\n  assert(stream._state === 'writable');\n\n  WritableStreamStartErroring(stream, error);\n}\n\n// Helper functions for the WritableStream.\n\nfunction streamBrandCheckException(name) {\n  return new TypeError('WritableStream.prototype.' + name + ' can only be used on a WritableStream');\n}\n\n// Helper functions for the WritableStreamDefaultWriter.\n\nfunction defaultWriterBrandCheckException(name) {\n  return new TypeError('WritableStreamDefaultWriter.prototype.' + name + ' can only be used on a WritableStreamDefaultWriter');\n}\n\nfunction defaultWriterLockException(name) {\n  return new TypeError('Cannot ' + name + ' a stream using a released writer');\n}\n\nfunction defaultWriterClosedPromiseInitialize(writer) {\n  writer._closedPromise = new Promise(function (resolve, reject) {\n    writer._closedPromise_resolve = resolve;\n    writer._closedPromise_reject = reject;\n    writer._closedPromiseState = 'pending';\n  });\n}\n\nfunction defaultWriterClosedPromiseInitializeAsRejected(writer, reason) {\n  writer._closedPromise = Promise.reject(reason);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseInitializeAsResolved(writer) {\n  writer._closedPromise = Promise.resolve(undefined);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'resolved';\n}\n\nfunction defaultWriterClosedPromiseReject(writer, reason) {\n  assert(writer._closedPromise_resolve !== undefined, 'writer._closedPromise_resolve !== undefined');\n  assert(writer._closedPromise_reject !== undefined, 'writer._closedPromise_reject !== undefined');\n  assert(writer._closedPromiseState === 'pending', 'writer._closedPromiseState is pending');\n\n  writer._closedPromise_reject(reason);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseResetToRejected(writer, reason) {\n  assert(writer._closedPromise_resolve === undefined, 'writer._closedPromise_resolve === undefined');\n  assert(writer._closedPromise_reject === undefined, 'writer._closedPromise_reject === undefined');\n  assert(writer._closedPromiseState !== 'pending', 'writer._closedPromiseState is not pending');\n\n  writer._closedPromise = Promise.reject(reason);\n  writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseResolve(writer) {\n  assert(writer._closedPromise_resolve !== undefined, 'writer._closedPromise_resolve !== undefined');\n  assert(writer._closedPromise_reject !== undefined, 'writer._closedPromise_reject !== undefined');\n  assert(writer._closedPromiseState === 'pending', 'writer._closedPromiseState is pending');\n\n  writer._closedPromise_resolve(undefined);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'resolved';\n}\n\nfunction defaultWriterReadyPromiseInitialize(writer) {\n  writer._readyPromise = new Promise(function (resolve, reject) {\n    writer._readyPromise_resolve = resolve;\n    writer._readyPromise_reject = reject;\n  });\n  writer._readyPromiseState = 'pending';\n}\n\nfunction defaultWriterReadyPromiseInitializeAsRejected(writer, reason) {\n  writer._readyPromise = Promise.reject(reason);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseInitializeAsResolved(writer) {\n  writer._readyPromise = Promise.resolve(undefined);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'fulfilled';\n}\n\nfunction defaultWriterReadyPromiseReject(writer, reason) {\n  assert(writer._readyPromise_resolve !== undefined, 'writer._readyPromise_resolve !== undefined');\n  assert(writer._readyPromise_reject !== undefined, 'writer._readyPromise_reject !== undefined');\n\n  writer._readyPromise_reject(reason);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseReset(writer) {\n  assert(writer._readyPromise_resolve === undefined, 'writer._readyPromise_resolve === undefined');\n  assert(writer._readyPromise_reject === undefined, 'writer._readyPromise_reject === undefined');\n\n  writer._readyPromise = new Promise(function (resolve, reject) {\n    writer._readyPromise_resolve = resolve;\n    writer._readyPromise_reject = reject;\n  });\n  writer._readyPromiseState = 'pending';\n}\n\nfunction defaultWriterReadyPromiseResetToRejected(writer, reason) {\n  assert(writer._readyPromise_resolve === undefined, 'writer._readyPromise_resolve === undefined');\n  assert(writer._readyPromise_reject === undefined, 'writer._readyPromise_reject === undefined');\n\n  writer._readyPromise = Promise.reject(reason);\n  writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseResolve(writer) {\n  assert(writer._readyPromise_resolve !== undefined, 'writer._readyPromise_resolve !== undefined');\n  assert(writer._readyPromise_reject !== undefined, 'writer._readyPromise_reject !== undefined');\n\n  writer._readyPromise_resolve(undefined);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'fulfilled';\n}\n\n/***/ }),\n/* 3 */\n/***/ (function(module, exports, __w_pdfjs_require__) {\n\n\"use strict\";\n\n\nvar _require = __w_pdfjs_require__(0),\n    IsFiniteNonNegativeNumber = _require.IsFiniteNonNegativeNumber;\n\nvar _require2 = __w_pdfjs_require__(1),\n    assert = _require2.assert;\n\nexports.DequeueValue = function (container) {\n  assert('_queue' in container && '_queueTotalSize' in container, 'Spec-level failure: DequeueValue should only be used on containers with [[queue]] and [[queueTotalSize]].');\n  assert(container._queue.length > 0, 'Spec-level failure: should never dequeue from an empty queue.');\n\n  var pair = container._queue.shift();\n  container._queueTotalSize -= pair.size;\n  if (container._queueTotalSize < 0) {\n    container._queueTotalSize = 0;\n  }\n\n  return pair.value;\n};\n\nexports.EnqueueValueWithSize = function (container, value, size) {\n  assert('_queue' in container && '_queueTotalSize' in container, 'Spec-level failure: EnqueueValueWithSize should only be used on containers with [[queue]] and ' + '[[queueTotalSize]].');\n\n  size = Number(size);\n  if (!IsFiniteNonNegativeNumber(size)) {\n    throw new RangeError('Size must be a finite, non-NaN, non-negative number.');\n  }\n\n  container._queue.push({ value: value, size: size });\n  container._queueTotalSize += size;\n};\n\nexports.PeekQueueValue = function (container) {\n  assert('_queue' in container && '_queueTotalSize' in container, 'Spec-level failure: PeekQueueValue should only be used on containers with [[queue]] and [[queueTotalSize]].');\n  assert(container._queue.length > 0, 'Spec-level failure: should never peek at an empty queue.');\n\n  var pair = container._queue[0];\n  return pair.value;\n};\n\nexports.ResetQueue = function (container) {\n  assert('_queue' in container && '_queueTotalSize' in container, 'Spec-level failure: ResetQueue should only be used on containers with [[queue]] and [[queueTotalSize]].');\n\n  container._queue = [];\n  container._queueTotalSize = 0;\n};\n\n/***/ }),\n/* 4 */\n/***/ (function(module, exports, __w_pdfjs_require__) {\n\n\"use strict\";\n\n\nvar _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if (\"value\" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();\n\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nvar _require = __w_pdfjs_require__(0),\n    ArrayBufferCopy = _require.ArrayBufferCopy,\n    CreateIterResultObject = _require.CreateIterResultObject,\n    IsFiniteNonNegativeNumber = _require.IsFiniteNonNegativeNumber,\n    InvokeOrNoop = _require.InvokeOrNoop,\n    PromiseInvokeOrNoop = _require.PromiseInvokeOrNoop,\n    TransferArrayBuffer = _require.TransferArrayBuffer,\n    ValidateAndNormalizeQueuingStrategy = _require.ValidateAndNormalizeQueuingStrategy,\n    ValidateAndNormalizeHighWaterMark = _require.ValidateAndNormalizeHighWaterMark;\n\nvar _require2 = __w_pdfjs_require__(0),\n    createArrayFromList = _require2.createArrayFromList,\n    createDataProperty = _require2.createDataProperty,\n    typeIsObject = _require2.typeIsObject;\n\nvar _require3 = __w_pdfjs_require__(1),\n    assert = _require3.assert,\n    rethrowAssertionErrorRejection = _require3.rethrowAssertionErrorRejection;\n\nvar _require4 = __w_pdfjs_require__(3),\n    DequeueValue = _require4.DequeueValue,\n    EnqueueValueWithSize = _require4.EnqueueValueWithSize,\n    ResetQueue = _require4.ResetQueue;\n\nvar _require5 = __w_pdfjs_require__(2),\n    AcquireWritableStreamDefaultWriter = _require5.AcquireWritableStreamDefaultWriter,\n    IsWritableStream = _require5.IsWritableStream,\n    IsWritableStreamLocked = _require5.IsWritableStreamLocked,\n    WritableStreamAbort = _require5.WritableStreamAbort,\n    WritableStreamDefaultWriterCloseWithErrorPropagation = _require5.WritableStreamDefaultWriterCloseWithErrorPropagation,\n    WritableStreamDefaultWriterRelease = _require5.WritableStreamDefaultWriterRelease,\n    WritableStreamDefaultWriterWrite = _require5.WritableStreamDefaultWriterWrite,\n    WritableStreamCloseQueuedOrInFlight = _require5.WritableStreamCloseQueuedOrInFlight;\n\nvar ReadableStream = function () {\n  function ReadableStream() {\n    var underlyingSource = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};\n\n    var _ref = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {},\n        size = _ref.size,\n        highWaterMark = _ref.highWaterMark;\n\n    _classCallCheck(this, ReadableStream);\n\n    // Exposed to controllers.\n    this._state = 'readable';\n\n    this._reader = undefined;\n    this._storedError = undefined;\n\n    this._disturbed = false;\n\n    // Initialize to undefined first because the constructor of the controller checks this\n    // variable to validate the caller.\n    this._readableStreamController = undefined;\n    var type = underlyingSource.type;\n    var typeString = String(type);\n    if (typeString === 'bytes') {\n      if (highWaterMark === undefined) {\n        highWaterMark = 0;\n      }\n      this._readableStreamController = new ReadableByteStreamController(this, underlyingSource, highWaterMark);\n    } else if (type === undefined) {\n      if (highWaterMark === undefined) {\n        highWaterMark = 1;\n      }\n      this._readableStreamController = new ReadableStreamDefaultController(this, underlyingSource, size, highWaterMark);\n    } else {\n      throw new RangeError('Invalid type is specified');\n    }\n  }\n\n  _createClass(ReadableStream, [{\n    key: 'cancel',\n    value: function cancel(reason) {\n      if (IsReadableStream(this) === false) {\n        return Promise.reject(streamBrandCheckException('cancel'));\n      }\n\n      if (IsReadableStreamLocked(this) === true) {\n        return Promise.reject(new TypeError('Cannot cancel a stream that already has a reader'));\n      }\n\n      return ReadableStreamCancel(this, reason);\n    }\n  }, {\n    key: 'getReader',\n    value: function getReader() {\n      var _ref2 = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},\n          mode = _ref2.mode;\n\n      if (IsReadableStream(this) === false) {\n        throw streamBrandCheckException('getReader');\n      }\n\n      if (mode === undefined) {\n        return AcquireReadableStreamDefaultReader(this);\n      }\n\n      mode = String(mode);\n\n      if (mode === 'byob') {\n        return AcquireReadableStreamBYOBReader(this);\n      }\n\n      throw new RangeError('Invalid mode is specified');\n    }\n  }, {\n    key: 'pipeThrough',\n    value: function pipeThrough(_ref3, options) {\n      var writable = _ref3.writable,\n          readable = _ref3.readable;\n\n      var promise = this.pipeTo(writable, options);\n\n      ifIsObjectAndHasAPromiseIsHandledInternalSlotSetPromiseIsHandledToTrue(promise);\n\n      return readable;\n    }\n  }, {\n    key: 'pipeTo',\n    value: function pipeTo(dest) {\n      var _this = this;\n\n      var _ref4 = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {},\n          preventClose = _ref4.preventClose,\n          preventAbort = _ref4.preventAbort,\n          preventCancel = _ref4.preventCancel;\n\n      if (IsReadableStream(this) === false) {\n        return Promise.reject(streamBrandCheckException('pipeTo'));\n      }\n      if (IsWritableStream(dest) === false) {\n        return Promise.reject(new TypeError('ReadableStream.prototype.pipeTo\\'s first argument must be a WritableStream'));\n      }\n\n      preventClose = Boolean(preventClose);\n      preventAbort = Boolean(preventAbort);\n      preventCancel = Boolean(preventCancel);\n\n      if (IsReadableStreamLocked(this) === true) {\n        return Promise.reject(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream'));\n      }\n      if (IsWritableStreamLocked(dest) === true) {\n        return Promise.reject(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream'));\n      }\n\n      var reader = AcquireReadableStreamDefaultReader(this);\n      var writer = AcquireWritableStreamDefaultWriter(dest);\n\n      var shuttingDown = false;\n\n      // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.\n      var currentWrite = Promise.resolve();\n\n      return new Promise(function (resolve, reject) {\n        // Using reader and writer, read all chunks from this and write them to dest\n        // - Backpressure must be enforced\n        // - Shutdown must stop all activity\n        function pipeLoop() {\n          currentWrite = Promise.resolve();\n\n          if (shuttingDown === true) {\n            return Promise.resolve();\n          }\n\n          return writer._readyPromise.then(function () {\n            return ReadableStreamDefaultReaderRead(reader).then(function (_ref5) {\n              var value = _ref5.value,\n                  done = _ref5.done;\n\n              if (done === true) {\n                return;\n              }\n\n              currentWrite = WritableStreamDefaultWriterWrite(writer, value).catch(function () {});\n            });\n          }).then(pipeLoop);\n        }\n\n        // Errors must be propagated forward\n        isOrBecomesErrored(_this, reader._closedPromise, function (storedError) {\n          if (preventAbort === false) {\n            shutdownWithAction(function () {\n              return WritableStreamAbort(dest, storedError);\n            }, true, storedError);\n          } else {\n            shutdown(true, storedError);\n          }\n        });\n\n        // Errors must be propagated backward\n        isOrBecomesErrored(dest, writer._closedPromise, function (storedError) {\n          if (preventCancel === false) {\n            shutdownWithAction(function () {\n              return ReadableStreamCancel(_this, storedError);\n            }, true, storedError);\n          } else {\n            shutdown(true, storedError);\n          }\n        });\n\n        // Closing must be propagated forward\n        isOrBecomesClosed(_this, reader._closedPromise, function () {\n          if (preventClose === false) {\n            shutdownWithAction(function () {\n              return WritableStreamDefaultWriterCloseWithErrorPropagation(writer);\n            });\n          } else {\n            shutdown();\n          }\n        });\n\n        // Closing must be propagated backward\n        if (WritableStreamCloseQueuedOrInFlight(dest) === true || dest._state === 'closed') {\n          var destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');\n\n          if (preventCancel === false) {\n            shutdownWithAction(function () {\n              return ReadableStreamCancel(_this, destClosed);\n            }, true, destClosed);\n          } else {\n            shutdown(true, destClosed);\n          }\n        }\n\n        pipeLoop().catch(function (err) {\n          currentWrite = Promise.resolve();\n          rethrowAssertionErrorRejection(err);\n        });\n\n        function waitForWritesToFinish() {\n          // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait\n          // for that too.\n          var oldCurrentWrite = currentWrite;\n          return currentWrite.then(function () {\n            return oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined;\n          });\n        }\n\n        function isOrBecomesErrored(stream, promise, action) {\n          if (stream._state === 'errored') {\n            action(stream._storedError);\n          } else {\n            promise.catch(action).catch(rethrowAssertionErrorRejection);\n          }\n        }\n\n        function isOrBecomesClosed(stream, promise, action) {\n          if (stream._state === 'closed') {\n            action();\n          } else {\n            promise.then(action).catch(rethrowAssertionErrorRejection);\n          }\n        }\n\n        function shutdownWithAction(action, originalIsError, originalError) {\n          if (shuttingDown === true) {\n            return;\n          }\n          shuttingDown = true;\n\n          if (dest._state === 'writable' && WritableStreamCloseQueuedOrInFlight(dest) === false) {\n            waitForWritesToFinish().then(doTheRest);\n          } else {\n            doTheRest();\n          }\n\n          function doTheRest() {\n            action().then(function () {\n              return finalize(originalIsError, originalError);\n            }, function (newError) {\n              return finalize(true, newError);\n            }).catch(rethrowAssertionErrorRejection);\n          }\n        }\n\n        function shutdown(isError, error) {\n          if (shuttingDown === true) {\n            return;\n          }\n          shuttingDown = true;\n\n          if (dest._state === 'writable' && WritableStreamCloseQueuedOrInFlight(dest) === false) {\n            waitForWritesToFinish().then(function () {\n              return finalize(isError, error);\n            }).catch(rethrowAssertionErrorRejection);\n          } else {\n            finalize(isError, error);\n          }\n        }\n\n        function finalize(isError, error) {\n          WritableStreamDefaultWriterRelease(writer);\n          ReadableStreamReaderGenericRelease(reader);\n\n          if (isError) {\n            reject(error);\n          } else {\n            resolve(undefined);\n          }\n        }\n      });\n    }\n  }, {\n    key: 'tee',\n    value: function tee() {\n      if (IsReadableStream(this) === false) {\n        throw streamBrandCheckException('tee');\n      }\n\n      var branches = ReadableStreamTee(this, false);\n      return createArrayFromList(branches);\n    }\n  }, {\n    key: 'locked',\n    get: function get() {\n      if (IsReadableStream(this) === false) {\n        throw streamBrandCheckException('locked');\n      }\n\n      return IsReadableStreamLocked(this);\n    }\n  }]);\n\n  return ReadableStream;\n}();\n\nmodule.exports = {\n  ReadableStream: ReadableStream,\n  IsReadableStreamDisturbed: IsReadableStreamDisturbed,\n  ReadableStreamDefaultControllerClose: ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue: ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError: ReadableStreamDefaultControllerError,\n  ReadableStreamDefaultControllerGetDesiredSize: ReadableStreamDefaultControllerGetDesiredSize\n};\n\n// Abstract operations for the ReadableStream.\n\nfunction AcquireReadableStreamBYOBReader(stream) {\n  return new ReadableStreamBYOBReader(stream);\n}\n\nfunction AcquireReadableStreamDefaultReader(stream) {\n  return new ReadableStreamDefaultReader(stream);\n}\n\nfunction IsReadableStream(x) {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction IsReadableStreamDisturbed(stream) {\n  assert(IsReadableStream(stream) === true, 'IsReadableStreamDisturbed should only be used on known readable streams');\n\n  return stream._disturbed;\n}\n\nfunction IsReadableStreamLocked(stream) {\n  assert(IsReadableStream(stream) === true, 'IsReadableStreamLocked should only be used on known readable streams');\n\n  if (stream._reader === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction ReadableStreamTee(stream, cloneForBranch2) {\n  assert(IsReadableStream(stream) === true);\n  assert(typeof cloneForBranch2 === 'boolean');\n\n  var reader = AcquireReadableStreamDefaultReader(stream);\n\n  var teeState = {\n    closedOrErrored: false,\n    canceled1: false,\n    canceled2: false,\n    reason1: undefined,\n    reason2: undefined\n  };\n  teeState.promise = new Promise(function (resolve) {\n    teeState._resolve = resolve;\n  });\n\n  var pull = create_ReadableStreamTeePullFunction();\n  pull._reader = reader;\n  pull._teeState = teeState;\n  pull._cloneForBranch2 = cloneForBranch2;\n\n  var cancel1 = create_ReadableStreamTeeBranch1CancelFunction();\n  cancel1._stream = stream;\n  cancel1._teeState = teeState;\n\n  var cancel2 = create_ReadableStreamTeeBranch2CancelFunction();\n  cancel2._stream = stream;\n  cancel2._teeState = teeState;\n\n  var underlyingSource1 = Object.create(Object.prototype);\n  createDataProperty(underlyingSource1, 'pull', pull);\n  createDataProperty(underlyingSource1, 'cancel', cancel1);\n  var branch1Stream = new ReadableStream(underlyingSource1);\n\n  var underlyingSource2 = Object.create(Object.prototype);\n  createDataProperty(underlyingSource2, 'pull', pull);\n  createDataProperty(underlyingSource2, 'cancel', cancel2);\n  var branch2Stream = new ReadableStream(underlyingSource2);\n\n  pull._branch1 = branch1Stream._readableStreamController;\n  pull._branch2 = branch2Stream._readableStreamController;\n\n  reader._closedPromise.catch(function (r) {\n    if (teeState.closedOrErrored === true) {\n      return;\n    }\n\n    ReadableStreamDefaultControllerError(pull._branch1, r);\n    ReadableStreamDefaultControllerError(pull._branch2, r);\n    teeState.closedOrErrored = true;\n  });\n\n  return [branch1Stream, branch2Stream];\n}\n\nfunction create_ReadableStreamTeePullFunction() {\n  function f() {\n    var reader = f._reader,\n        branch1 = f._branch1,\n        branch2 = f._branch2,\n        teeState = f._teeState;\n\n\n    return ReadableStreamDefaultReaderRead(reader).then(function (result) {\n      assert(typeIsObject(result));\n      var value = result.value;\n      var done = result.done;\n      assert(typeof done === 'boolean');\n\n      if (done === true && teeState.closedOrErrored === false) {\n        if (teeState.canceled1 === false) {\n          ReadableStreamDefaultControllerClose(branch1);\n        }\n        if (teeState.canceled2 === false) {\n          ReadableStreamDefaultControllerClose(branch2);\n        }\n        teeState.closedOrErrored = true;\n      }\n\n      if (teeState.closedOrErrored === true) {\n        return;\n      }\n\n      var value1 = value;\n      var value2 = value;\n\n      // There is no way to access the cloning code right now in the reference implementation.\n      // If we add one then we'll need an implementation for serializable objects.\n      // if (teeState.canceled2 === false && cloneForBranch2 === true) {\n      //   value2 = StructuredDeserialize(StructuredSerialize(value2));\n      // }\n\n      if (teeState.canceled1 === false) {\n        ReadableStreamDefaultControllerEnqueue(branch1, value1);\n      }\n\n      if (teeState.canceled2 === false) {\n        ReadableStreamDefaultControllerEnqueue(branch2, value2);\n      }\n    });\n  }\n  return f;\n}\n\nfunction create_ReadableStreamTeeBranch1CancelFunction() {\n  function f(reason) {\n    var stream = f._stream,\n        teeState = f._teeState;\n\n\n    teeState.canceled1 = true;\n    teeState.reason1 = reason;\n    if (teeState.canceled2 === true) {\n      var compositeReason = createArrayFromList([teeState.reason1, teeState.reason2]);\n      var cancelResult = ReadableStreamCancel(stream, compositeReason);\n      teeState._resolve(cancelResult);\n    }\n    return teeState.promise;\n  }\n  return f;\n}\n\nfunction create_ReadableStreamTeeBranch2CancelFunction() {\n  function f(reason) {\n    var stream = f._stream,\n        teeState = f._teeState;\n\n\n    teeState.canceled2 = true;\n    teeState.reason2 = reason;\n    if (teeState.canceled1 === true) {\n      var compositeReason = createArrayFromList([teeState.reason1, teeState.reason2]);\n      var cancelResult = ReadableStreamCancel(stream, compositeReason);\n      teeState._resolve(cancelResult);\n    }\n    return teeState.promise;\n  }\n  return f;\n}\n\n// ReadableStream API exposed for controllers.\n\nfunction ReadableStreamAddReadIntoRequest(stream) {\n  assert(IsReadableStreamBYOBReader(stream._reader) === true);\n  assert(stream._state === 'readable' || stream._state === 'closed');\n\n  var promise = new Promise(function (resolve, reject) {\n    var readIntoRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._reader._readIntoRequests.push(readIntoRequest);\n  });\n\n  return promise;\n}\n\nfunction ReadableStreamAddReadRequest(stream) {\n  assert(IsReadableStreamDefaultReader(stream._reader) === true);\n  assert(stream._state === 'readable');\n\n  var promise = new Promise(function (resolve, reject) {\n    var readRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._reader._readRequests.push(readRequest);\n  });\n\n  return promise;\n}\n\nfunction ReadableStreamCancel(stream, reason) {\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    return Promise.resolve(undefined);\n  }\n  if (stream._state === 'errored') {\n    return Promise.reject(stream._storedError);\n  }\n\n  ReadableStreamClose(stream);\n\n  var sourceCancelPromise = stream._readableStreamController.__cancelSteps(reason);\n  return sourceCancelPromise.then(function () {\n    return undefined;\n  });\n}\n\nfunction ReadableStreamClose(stream) {\n  assert(stream._state === 'readable');\n\n  stream._state = 'closed';\n\n  var reader = stream._reader;\n\n  if (reader === undefined) {\n    return undefined;\n  }\n\n  if (IsReadableStreamDefaultReader(reader) === true) {\n    for (var i = 0; i < reader._readRequests.length; i++) {\n      var _resolve = reader._readRequests[i]._resolve;\n\n      _resolve(CreateIterResultObject(undefined, true));\n    }\n    reader._readRequests = [];\n  }\n\n  defaultReaderClosedPromiseResolve(reader);\n\n  return undefined;\n}\n\nfunction ReadableStreamError(stream, e) {\n  assert(IsReadableStream(stream) === true, 'stream must be ReadableStream');\n  assert(stream._state === 'readable', 'state must be readable');\n\n  stream._state = 'errored';\n  stream._storedError = e;\n\n  var reader = stream._reader;\n\n  if (reader === undefined) {\n    return undefined;\n  }\n\n  if (IsReadableStreamDefaultReader(reader) === true) {\n    for (var i = 0; i < reader._readRequests.length; i++) {\n      var readRequest = reader._readRequests[i];\n      readRequest._reject(e);\n    }\n\n    reader._readRequests = [];\n  } else {\n    assert(IsReadableStreamBYOBReader(reader), 'reader must be ReadableStreamBYOBReader');\n\n    for (var _i = 0; _i < reader._readIntoRequests.length; _i++) {\n      var readIntoRequest = reader._readIntoRequests[_i];\n      readIntoRequest._reject(e);\n    }\n\n    reader._readIntoRequests = [];\n  }\n\n  defaultReaderClosedPromiseReject(reader, e);\n  reader._closedPromise.catch(function () {});\n}\n\nfunction ReadableStreamFulfillReadIntoRequest(stream, chunk, done) {\n  var reader = stream._reader;\n\n  assert(reader._readIntoRequests.length > 0);\n\n  var readIntoRequest = reader._readIntoRequests.shift();\n  readIntoRequest._resolve(CreateIterResultObject(chunk, done));\n}\n\nfunction ReadableStreamFulfillReadRequest(stream, chunk, done) {\n  var reader = stream._reader;\n\n  assert(reader._readRequests.length > 0);\n\n  var readRequest = reader._readRequests.shift();\n  readRequest._resolve(CreateIterResultObject(chunk, done));\n}\n\nfunction ReadableStreamGetNumReadIntoRequests(stream) {\n  return stream._reader._readIntoRequests.length;\n}\n\nfunction ReadableStreamGetNumReadRequests(stream) {\n  return stream._reader._readRequests.length;\n}\n\nfunction ReadableStreamHasBYOBReader(stream) {\n  var reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (IsReadableStreamBYOBReader(reader) === false) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction ReadableStreamHasDefaultReader(stream) {\n  var reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (IsReadableStreamDefaultReader(reader) === false) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nvar ReadableStreamDefaultReader = function () {\n  function ReadableStreamDefaultReader(stream) {\n    _classCallCheck(this, ReadableStreamDefaultReader);\n\n    if (IsReadableStream(stream) === false) {\n      throw new TypeError('ReadableStreamDefaultReader can only be constructed with a ReadableStream instance');\n    }\n    if (IsReadableStreamLocked(stream) === true) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readRequests = [];\n  }\n\n  _createClass(ReadableStreamDefaultReader, [{\n    key: 'cancel',\n    value: function cancel(reason) {\n      if (IsReadableStreamDefaultReader(this) === false) {\n        return Promise.reject(defaultReaderBrandCheckException('cancel'));\n      }\n\n      if (this._ownerReadableStream === undefined) {\n        return Promise.reject(readerLockException('cancel'));\n      }\n\n      return ReadableStreamReaderGenericCancel(this, reason);\n    }\n  }, {\n    key: 'read',\n    value: function read() {\n      if (IsReadableStreamDefaultReader(this) === false) {\n        return Promise.reject(defaultReaderBrandCheckException('read'));\n      }\n\n      if (this._ownerReadableStream === undefined) {\n        return Promise.reject(readerLockException('read from'));\n      }\n\n      return ReadableStreamDefaultReaderRead(this);\n    }\n  }, {\n    key: 'releaseLock',\n    value: function releaseLock() {\n      if (IsReadableStreamDefaultReader(this) === false) {\n        throw defaultReaderBrandCheckException('releaseLock');\n      }\n\n      if (this._ownerReadableStream === undefined) {\n        return;\n      }\n\n      if (this._readRequests.length > 0) {\n        throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n      }\n\n      ReadableStreamReaderGenericRelease(this);\n    }\n  }, {\n    key: 'closed',\n    get: function get() {\n      if (IsReadableStreamDefaultReader(this) === false) {\n        return Promise.reject(defaultReaderBrandCheckException('closed'));\n      }\n\n      return this._closedPromise;\n    }\n  }]);\n\n  return ReadableStreamDefaultReader;\n}();\n\nvar ReadableStreamBYOBReader = function () {\n  function ReadableStreamBYOBReader(stream) {\n    _classCallCheck(this, ReadableStreamBYOBReader);\n\n    if (!IsReadableStream(stream)) {\n      throw new TypeError('ReadableStreamBYOBReader can only be constructed with a ReadableStream instance given a ' + 'byte source');\n    }\n    if (IsReadableByteStreamController(stream._readableStreamController) === false) {\n      throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' + 'source');\n    }\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readIntoRequests = [];\n  }\n\n  _createClass(ReadableStreamBYOBReader, [{\n    key: 'cancel',\n    value: function cancel(reason) {\n      if (!IsReadableStreamBYOBReader(this)) {\n        return Promise.reject(byobReaderBrandCheckException('cancel'));\n      }\n\n      if (this._ownerReadableStream === undefined) {\n        return Promise.reject(readerLockException('cancel'));\n      }\n\n      return ReadableStreamReaderGenericCancel(this, reason);\n    }\n  }, {\n    key: 'read',\n    value: function read(view) {\n      if (!IsReadableStreamBYOBReader(this)) {\n        return Promise.reject(byobReaderBrandCheckException('read'));\n      }\n\n      if (this._ownerReadableStream === undefined) {\n        return Promise.reject(readerLockException('read from'));\n      }\n\n      if (!ArrayBuffer.isView(view)) {\n        return Promise.reject(new TypeError('view must be an array buffer view'));\n      }\n\n      if (view.byteLength === 0) {\n        return Promise.reject(new TypeError('view must have non-zero byteLength'));\n      }\n\n      return ReadableStreamBYOBReaderRead(this, view);\n    }\n  }, {\n    key: 'releaseLock',\n    value: function releaseLock() {\n      if (!IsReadableStreamBYOBReader(this)) {\n        throw byobReaderBrandCheckException('releaseLock');\n      }\n\n      if (this._ownerReadableStream === undefined) {\n        return;\n      }\n\n      if (this._readIntoRequests.length > 0) {\n        throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n      }\n\n      ReadableStreamReaderGenericRelease(this);\n    }\n  }, {\n    key: 'closed',\n    get: function get() {\n      if (!IsReadableStreamBYOBReader(this)) {\n        return Promise.reject(byobReaderBrandCheckException('closed'));\n      }\n\n      return this._closedPromise;\n    }\n  }]);\n\n  return ReadableStreamBYOBReader;\n}();\n\n// Abstract operations for the readers.\n\nfunction IsReadableStreamBYOBReader(x) {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction IsReadableStreamDefaultReader(x) {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction ReadableStreamReaderGenericInitialize(reader, stream) {\n  reader._ownerReadableStream = stream;\n  stream._reader = reader;\n\n  if (stream._state === 'readable') {\n    defaultReaderClosedPromiseInitialize(reader);\n  } else if (stream._state === 'closed') {\n    defaultReaderClosedPromiseInitializeAsResolved(reader);\n  } else {\n    assert(stream._state === 'errored', 'state must be errored');\n\n    defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);\n    reader._closedPromise.catch(function () {});\n  }\n}\n\n// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state\n// check.\n\nfunction ReadableStreamReaderGenericCancel(reader, reason) {\n  var stream = reader._ownerReadableStream;\n  assert(stream !== undefined);\n  return ReadableStreamCancel(stream, reason);\n}\n\nfunction ReadableStreamReaderGenericRelease(reader) {\n  assert(reader._ownerReadableStream !== undefined);\n  assert(reader._ownerReadableStream._reader === reader);\n\n  if (reader._ownerReadableStream._state === 'readable') {\n    defaultReaderClosedPromiseReject(reader, new TypeError('Reader was released and can no longer be used to monitor the stream\\'s closedness'));\n  } else {\n    defaultReaderClosedPromiseResetToRejected(reader, new TypeError('Reader was released and can no longer be used to monitor the stream\\'s closedness'));\n  }\n  reader._closedPromise.catch(function () {});\n\n  reader._ownerReadableStream._reader = undefined;\n  reader._ownerReadableStream = undefined;\n}\n\nfunction ReadableStreamBYOBReaderRead(reader, view) {\n  var stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'errored') {\n    return Promise.reject(stream._storedError);\n  }\n\n  // Controllers must implement this.\n  return ReadableByteStreamControllerPullInto(stream._readableStreamController, view);\n}\n\nfunction ReadableStreamDefaultReaderRead(reader) {\n  var stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    return Promise.resolve(CreateIterResultObject(undefined, true));\n  }\n\n  if (stream._state === 'errored') {\n    return Promise.reject(stream._storedError);\n  }\n\n  assert(stream._state === 'readable');\n\n  return stream._readableStreamController.__pullSteps();\n}\n\n// Controllers\n\nvar ReadableStreamDefaultController = function () {\n  function ReadableStreamDefaultController(stream, underlyingSource, size, highWaterMark) {\n    _classCallCheck(this, ReadableStreamDefaultController);\n\n    if (IsReadableStream(stream) === false) {\n      throw new TypeError('ReadableStreamDefaultController can only be constructed with a ReadableStream instance');\n    }\n\n    if (stream._readableStreamController !== undefined) {\n      throw new TypeError('ReadableStreamDefaultController instances can only be created by the ReadableStream constructor');\n    }\n\n    this._controlledReadableStream = stream;\n\n    this._underlyingSource = underlyingSource;\n\n    // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n    this._queue = undefined;\n    this._queueTotalSize = undefined;\n    ResetQueue(this);\n\n    this._started = false;\n    this._closeRequested = false;\n    this._pullAgain = false;\n    this._pulling = false;\n\n    var normalizedStrategy = ValidateAndNormalizeQueuingStrategy(size, highWaterMark);\n    this._strategySize = normalizedStrategy.size;\n    this._strategyHWM = normalizedStrategy.highWaterMark;\n\n    var controller = this;\n\n    var startResult = InvokeOrNoop(underlyingSource, 'start', [this]);\n    Promise.resolve(startResult).then(function () {\n      controller._started = true;\n\n      assert(controller._pulling === false);\n      assert(controller._pullAgain === false);\n\n      ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n    }, function (r) {\n      ReadableStreamDefaultControllerErrorIfNeeded(controller, r);\n    }).catch(rethrowAssertionErrorRejection);\n  }\n\n  _createClass(ReadableStreamDefaultController, [{\n    key: 'close',\n    value: function close() {\n      if (IsReadableStreamDefaultController(this) === false) {\n        throw defaultControllerBrandCheckException('close');\n      }\n\n      if (this._closeRequested === true) {\n        throw new TypeError('The stream has already been closed; do not close it again!');\n      }\n\n      var state = this._controlledReadableStream._state;\n      if (state !== 'readable') {\n        throw new TypeError('The stream (in ' + state + ' state) is not in the readable state and cannot be closed');\n      }\n\n      ReadableStreamDefaultControllerClose(this);\n    }\n  }, {\n    key: 'enqueue',\n    value: function enqueue(chunk) {\n      if (IsReadableStreamDefaultController(this) === false) {\n        throw defaultControllerBrandCheckException('enqueue');\n      }\n\n      if (this._closeRequested === true) {\n        throw new TypeError('stream is closed or draining');\n      }\n\n      var state = this._controlledReadableStream._state;\n      if (state !== 'readable') {\n        throw new TypeError('The stream (in ' + state + ' state) is not in the readable state and cannot be enqueued to');\n      }\n\n      return ReadableStreamDefaultControllerEnqueue(this, chunk);\n    }\n  }, {\n    key: 'error',\n    value: function error(e) {\n      if (IsReadableStreamDefaultController(this) === false) {\n        throw defaultControllerBrandCheckException('error');\n      }\n\n      var stream = this._controlledReadableStream;\n      if (stream._state !== 'readable') {\n        throw new TypeError('The stream is ' + stream._state + ' and so cannot be errored');\n      }\n\n      ReadableStreamDefaultControllerError(this, e);\n    }\n  }, {\n    key: '__cancelSteps',\n    value: function __cancelSteps(reason) {\n      ResetQueue(this);\n      return PromiseInvokeOrNoop(this._underlyingSource, 'cancel', [reason]);\n    }\n  }, {\n    key: '__pullSteps',\n    value: function __pullSteps() {\n      var stream = this._controlledReadableStream;\n\n      if (this._queue.length > 0) {\n        var chunk = DequeueValue(this);\n\n        if (this._closeRequested === true && this._queue.length === 0) {\n          ReadableStreamClose(stream);\n        } else {\n          ReadableStreamDefaultControllerCallPullIfNeeded(this);\n        }\n\n        return Promise.resolve(CreateIterResultObject(chunk, false));\n      }\n\n      var pendingPromise = ReadableStreamAddReadRequest(stream);\n      ReadableStreamDefaultControllerCallPullIfNeeded(this);\n      return pendingPromise;\n    }\n  }, {\n    key: 'desiredSize',\n    get: function get() {\n      if (IsReadableStreamDefaultController(this) === false) {\n        throw defaultControllerBrandCheckException('desiredSize');\n      }\n\n      return ReadableStreamDefaultControllerGetDesiredSize(this);\n    }\n  }]);\n\n  return ReadableStreamDefaultController;\n}();\n\n// Abstract operations for the ReadableStreamDefaultController.\n\nfunction IsReadableStreamDefaultController(x) {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_underlyingSource')) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction ReadableStreamDefaultControllerCallPullIfNeeded(controller) {\n  var shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);\n  if (shouldPull === false) {\n    return undefined;\n  }\n\n  if (controller._pulling === true) {\n    controller._pullAgain = true;\n    return undefined;\n  }\n\n  assert(controller._pullAgain === false);\n\n  controller._pulling = true;\n\n  var pullPromise = PromiseInvokeOrNoop(controller._underlyingSource, 'pull', [controller]);\n  pullPromise.then(function () {\n    controller._pulling = false;\n\n    if (controller._pullAgain === true) {\n      controller._pullAgain = false;\n      return ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n    }\n    return undefined;\n  }, function (e) {\n    ReadableStreamDefaultControllerErrorIfNeeded(controller, e);\n  }).catch(rethrowAssertionErrorRejection);\n\n  return undefined;\n}\n\nfunction ReadableStreamDefaultControllerShouldCallPull(controller) {\n  var stream = controller._controlledReadableStream;\n\n  if (stream._state === 'closed' || stream._state === 'errored') {\n    return false;\n  }\n\n  if (controller._closeRequested === true) {\n    return false;\n  }\n\n  if (controller._started === false) {\n    return false;\n  }\n\n  if (IsReadableStreamLocked(stream) === true && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  var desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);\n  if (desiredSize > 0) {\n    return true;\n  }\n\n  return false;\n}\n\n// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.\n\nfunction ReadableStreamDefaultControllerClose(controller) {\n  var stream = controller._controlledReadableStream;\n\n  assert(controller._closeRequested === false);\n  assert(stream._state === 'readable');\n\n  controller._closeRequested = true;\n\n  if (controller._queue.length === 0) {\n    ReadableStreamClose(stream);\n  }\n}\n\nfunction ReadableStreamDefaultControllerEnqueue(controller, chunk) {\n  var stream = controller._controlledReadableStream;\n\n  assert(controller._closeRequested === false);\n  assert(stream._state === 'readable');\n\n  if (IsReadableStreamLocked(stream) === true && ReadableStreamGetNumReadRequests(stream) > 0) {\n    ReadableStreamFulfillReadRequest(stream, chunk, false);\n  } else {\n    var chunkSize = 1;\n\n    if (controller._strategySize !== undefined) {\n      var strategySize = controller._strategySize;\n      try {\n        chunkSize = strategySize(chunk);\n      } catch (chunkSizeE) {\n        ReadableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);\n        throw chunkSizeE;\n      }\n    }\n\n    try {\n      EnqueueValueWithSize(controller, chunk, chunkSize);\n    } catch (enqueueE) {\n      ReadableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);\n      throw enqueueE;\n    }\n  }\n\n  ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n\n  return undefined;\n}\n\nfunction ReadableStreamDefaultControllerError(controller, e) {\n  var stream = controller._controlledReadableStream;\n\n  assert(stream._state === 'readable');\n\n  ResetQueue(controller);\n\n  ReadableStreamError(stream, e);\n}\n\nfunction ReadableStreamDefaultControllerErrorIfNeeded(controller, e) {\n  if (controller._controlledReadableStream._state === 'readable') {\n    ReadableStreamDefaultControllerError(controller, e);\n  }\n}\n\nfunction ReadableStreamDefaultControllerGetDesiredSize(controller) {\n  var stream = controller._controlledReadableStream;\n  var state = stream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nvar ReadableStreamBYOBRequest = function () {\n  function ReadableStreamBYOBRequest(controller, view) {\n    _classCallCheck(this, ReadableStreamBYOBRequest);\n\n    this._associatedReadableByteStreamController = controller;\n    this._view = view;\n  }\n\n  _createClass(ReadableStreamBYOBRequest, [{\n    key: 'respond',\n    value: function respond(bytesWritten) {\n      if (IsReadableStreamBYOBRequest(this) === false) {\n        throw byobRequestBrandCheckException('respond');\n      }\n\n      if (this._associatedReadableByteStreamController === undefined) {\n        throw new TypeError('This BYOB request has been invalidated');\n      }\n\n      ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);\n    }\n  }, {\n    key: 'respondWithNewView',\n    value: function respondWithNewView(view) {\n      if (IsReadableStreamBYOBRequest(this) === false) {\n        throw byobRequestBrandCheckException('respond');\n      }\n\n      if (this._associatedReadableByteStreamController === undefined) {\n        throw new TypeError('This BYOB request has been invalidated');\n      }\n\n      if (!ArrayBuffer.isView(view)) {\n        throw new TypeError('You can only respond with array buffer views');\n      }\n\n      ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);\n    }\n  }, {\n    key: 'view',\n    get: function get() {\n      return this._view;\n    }\n  }]);\n\n  return ReadableStreamBYOBRequest;\n}();\n\nvar ReadableByteStreamController = function () {\n  function ReadableByteStreamController(stream, underlyingByteSource, highWaterMark) {\n    _classCallCheck(this, ReadableByteStreamController);\n\n    if (IsReadableStream(stream) === false) {\n      throw new TypeError('ReadableByteStreamController can only be constructed with a ReadableStream instance given ' + 'a byte source');\n    }\n\n    if (stream._readableStreamController !== undefined) {\n      throw new TypeError('ReadableByteStreamController instances can only be created by the ReadableStream constructor given a byte ' + 'source');\n    }\n\n    this._controlledReadableStream = stream;\n\n    this._underlyingByteSource = underlyingByteSource;\n\n    this._pullAgain = false;\n    this._pulling = false;\n\n    ReadableByteStreamControllerClearPendingPullIntos(this);\n\n    // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n    this._queue = this._queueTotalSize = undefined;\n    ResetQueue(this);\n\n    this._closeRequested = false;\n    this._started = false;\n\n    this._strategyHWM = ValidateAndNormalizeHighWaterMark(highWaterMark);\n\n    var autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;\n    if (autoAllocateChunkSize !== undefined) {\n      if (Number.isInteger(autoAllocateChunkSize) === false || autoAllocateChunkSize <= 0) {\n        throw new RangeError('autoAllocateChunkSize must be a positive integer');\n      }\n    }\n    this._autoAllocateChunkSize = autoAllocateChunkSize;\n\n    this._pendingPullIntos = [];\n\n    var controller = this;\n\n    var startResult = InvokeOrNoop(underlyingByteSource, 'start', [this]);\n    Promise.resolve(startResult).then(function () {\n      controller._started = true;\n\n      assert(controller._pulling === false);\n      assert(controller._pullAgain === false);\n\n      ReadableByteStreamControllerCallPullIfNeeded(controller);\n    }, function (r) {\n      if (stream._state === 'readable') {\n        ReadableByteStreamControllerError(controller, r);\n      }\n    }).catch(rethrowAssertionErrorRejection);\n  }\n\n  _createClass(ReadableByteStreamController, [{\n    key: 'close',\n    value: function close() {\n      if (IsReadableByteStreamController(this) === false) {\n        throw byteStreamControllerBrandCheckException('close');\n      }\n\n      if (this._closeRequested === true) {\n        throw new TypeError('The stream has already been closed; do not close it again!');\n      }\n\n      var state = this._controlledReadableStream._state;\n      if (state !== 'readable') {\n        throw new TypeError('The stream (in ' + state + ' state) is not in the readable state and cannot be closed');\n      }\n\n      ReadableByteStreamControllerClose(this);\n    }\n  }, {\n    key: 'enqueue',\n    value: function enqueue(chunk) {\n      if (IsReadableByteStreamController(this) === false) {\n        throw byteStreamControllerBrandCheckException('enqueue');\n      }\n\n      if (this._closeRequested === true) {\n        throw new TypeError('stream is closed or draining');\n      }\n\n      var state = this._controlledReadableStream._state;\n      if (state !== 'readable') {\n        throw new TypeError('The stream (in ' + state + ' state) is not in the readable state and cannot be enqueued to');\n      }\n\n      if (!ArrayBuffer.isView(chunk)) {\n        throw new TypeError('You can only enqueue array buffer views when using a ReadableByteStreamController');\n      }\n\n      ReadableByteStreamControllerEnqueue(this, chunk);\n    }\n  }, {\n    key: 'error',\n    value: function error(e) {\n      if (IsReadableByteStreamController(this) === false) {\n        throw byteStreamControllerBrandCheckException('error');\n      }\n\n      var stream = this._controlledReadableStream;\n      if (stream._state !== 'readable') {\n        throw new TypeError('The stream is ' + stream._state + ' and so cannot be errored');\n      }\n\n      ReadableByteStreamControllerError(this, e);\n    }\n  }, {\n    key: '__cancelSteps',\n    value: function __cancelSteps(reason) {\n      if (this._pendingPullIntos.length > 0) {\n        var firstDescriptor = this._pendingPullIntos[0];\n        firstDescriptor.bytesFilled = 0;\n      }\n\n      ResetQueue(this);\n\n      return PromiseInvokeOrNoop(this._underlyingByteSource, 'cancel', [reason]);\n    }\n  }, {\n    key: '__pullSteps',\n    value: function __pullSteps() {\n      var stream = this._controlledReadableStream;\n      assert(ReadableStreamHasDefaultReader(stream) === true);\n\n      if (this._queueTotalSize > 0) {\n        assert(ReadableStreamGetNumReadRequests(stream) === 0);\n\n        var entry = this._queue.shift();\n        this._queueTotalSize -= entry.byteLength;\n\n        ReadableByteStreamControllerHandleQueueDrain(this);\n\n        var view = void 0;\n        try {\n          view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);\n        } catch (viewE) {\n          return Promise.reject(viewE);\n        }\n\n        return Promise.resolve(CreateIterResultObject(view, false));\n      }\n\n      var autoAllocateChunkSize = this._autoAllocateChunkSize;\n      if (autoAllocateChunkSize !== undefined) {\n        var buffer = void 0;\n        try {\n          buffer = new ArrayBuffer(autoAllocateChunkSize);\n        } catch (bufferE) {\n          return Promise.reject(bufferE);\n        }\n\n        var pullIntoDescriptor = {\n          buffer: buffer,\n          byteOffset: 0,\n          byteLength: autoAllocateChunkSize,\n          bytesFilled: 0,\n          elementSize: 1,\n          ctor: Uint8Array,\n          readerType: 'default'\n        };\n\n        this._pendingPullIntos.push(pullIntoDescriptor);\n      }\n\n      var promise = ReadableStreamAddReadRequest(stream);\n\n      ReadableByteStreamControllerCallPullIfNeeded(this);\n\n      return promise;\n    }\n  }, {\n    key: 'byobRequest',\n    get: function get() {\n      if (IsReadableByteStreamController(this) === false) {\n        throw byteStreamControllerBrandCheckException('byobRequest');\n      }\n\n      if (this._byobRequest === undefined && this._pendingPullIntos.length > 0) {\n        var firstDescriptor = this._pendingPullIntos[0];\n        var view = new Uint8Array(firstDescriptor.buffer, firstDescriptor.byteOffset + firstDescriptor.bytesFilled, firstDescriptor.byteLength - firstDescriptor.bytesFilled);\n\n        this._byobRequest = new ReadableStreamBYOBRequest(this, view);\n      }\n\n      return this._byobRequest;\n    }\n  }, {\n    key: 'desiredSize',\n    get: function get() {\n      if (IsReadableByteStreamController(this) === false) {\n        throw byteStreamControllerBrandCheckException('desiredSize');\n      }\n\n      return ReadableByteStreamControllerGetDesiredSize(this);\n    }\n  }]);\n\n  return ReadableByteStreamController;\n}();\n\n// Abstract operations for the ReadableByteStreamController.\n\nfunction IsReadableByteStreamController(x) {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_underlyingByteSource')) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction IsReadableStreamBYOBRequest(x) {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction ReadableByteStreamControllerCallPullIfNeeded(controller) {\n  var shouldPull = ReadableByteStreamControllerShouldCallPull(controller);\n  if (shouldPull === false) {\n    return undefined;\n  }\n\n  if (controller._pulling === true) {\n    controller._pullAgain = true;\n    return undefined;\n  }\n\n  assert(controller._pullAgain === false);\n\n  controller._pulling = true;\n\n  // TODO: Test controller argument\n  var pullPromise = PromiseInvokeOrNoop(controller._underlyingByteSource, 'pull', [controller]);\n  pullPromise.then(function () {\n    controller._pulling = false;\n\n    if (controller._pullAgain === true) {\n      controller._pullAgain = false;\n      ReadableByteStreamControllerCallPullIfNeeded(controller);\n    }\n  }, function (e) {\n    if (controller._controlledReadableStream._state === 'readable') {\n      ReadableByteStreamControllerError(controller, e);\n    }\n  }).catch(rethrowAssertionErrorRejection);\n\n  return undefined;\n}\n\nfunction ReadableByteStreamControllerClearPendingPullIntos(controller) {\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n  controller._pendingPullIntos = [];\n}\n\nfunction ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor) {\n  assert(stream._state !== 'errored', 'state must not be errored');\n\n  var done = false;\n  if (stream._state === 'closed') {\n    assert(pullIntoDescriptor.bytesFilled === 0);\n    done = true;\n  }\n\n  var filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);\n  if (pullIntoDescriptor.readerType === 'default') {\n    ReadableStreamFulfillReadRequest(stream, filledView, done);\n  } else {\n    assert(pullIntoDescriptor.readerType === 'byob');\n    ReadableStreamFulfillReadIntoRequest(stream, filledView, done);\n  }\n}\n\nfunction ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor) {\n  var bytesFilled = pullIntoDescriptor.bytesFilled;\n  var elementSize = pullIntoDescriptor.elementSize;\n\n  assert(bytesFilled <= pullIntoDescriptor.byteLength);\n  assert(bytesFilled % elementSize === 0);\n\n  return new pullIntoDescriptor.ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize);\n}\n\nfunction ReadableByteStreamControllerEnqueueChunkToQueue(controller, buffer, byteOffset, byteLength) {\n  controller._queue.push({ buffer: buffer, byteOffset: byteOffset, byteLength: byteLength });\n  controller._queueTotalSize += byteLength;\n}\n\nfunction ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) {\n  var elementSize = pullIntoDescriptor.elementSize;\n\n  var currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;\n\n  var maxBytesToCopy = Math.min(controller._queueTotalSize, pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);\n  var maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;\n  var maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;\n\n  var totalBytesToCopyRemaining = maxBytesToCopy;\n  var ready = false;\n  if (maxAlignedBytes > currentAlignedBytes) {\n    totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;\n    ready = true;\n  }\n\n  var queue = controller._queue;\n\n  while (totalBytesToCopyRemaining > 0) {\n    var headOfQueue = queue[0];\n\n    var bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);\n\n    var destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    ArrayBufferCopy(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);\n\n    if (headOfQueue.byteLength === bytesToCopy) {\n      queue.shift();\n    } else {\n      headOfQueue.byteOffset += bytesToCopy;\n      headOfQueue.byteLength -= bytesToCopy;\n    }\n    controller._queueTotalSize -= bytesToCopy;\n\n    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);\n\n    totalBytesToCopyRemaining -= bytesToCopy;\n  }\n\n  if (ready === false) {\n    assert(controller._queueTotalSize === 0, 'queue must be empty');\n    assert(pullIntoDescriptor.bytesFilled > 0);\n    assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);\n  }\n\n  return ready;\n}\n\nfunction ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, size, pullIntoDescriptor) {\n  assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos[0] === pullIntoDescriptor);\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n  pullIntoDescriptor.bytesFilled += size;\n}\n\nfunction ReadableByteStreamControllerHandleQueueDrain(controller) {\n  assert(controller._controlledReadableStream._state === 'readable');\n\n  if (controller._queueTotalSize === 0 && controller._closeRequested === true) {\n    ReadableStreamClose(controller._controlledReadableStream);\n  } else {\n    ReadableByteStreamControllerCallPullIfNeeded(controller);\n  }\n}\n\nfunction ReadableByteStreamControllerInvalidateBYOBRequest(controller) {\n  if (controller._byobRequest === undefined) {\n    return;\n  }\n\n  controller._byobRequest._associatedReadableByteStreamController = undefined;\n  controller._byobRequest._view = undefined;\n  controller._byobRequest = undefined;\n}\n\nfunction ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller) {\n  assert(controller._closeRequested === false);\n\n  while (controller._pendingPullIntos.length > 0) {\n    if (controller._queueTotalSize === 0) {\n      return;\n    }\n\n    var pullIntoDescriptor = controller._pendingPullIntos[0];\n\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) === true) {\n      ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n      ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableStream, pullIntoDescriptor);\n    }\n  }\n}\n\nfunction ReadableByteStreamControllerPullInto(controller, view) {\n  var stream = controller._controlledReadableStream;\n\n  var elementSize = 1;\n  if (view.constructor !== DataView) {\n    elementSize = view.constructor.BYTES_PER_ELEMENT;\n  }\n\n  var ctor = view.constructor;\n\n  var pullIntoDescriptor = {\n    buffer: view.buffer,\n    byteOffset: view.byteOffset,\n    byteLength: view.byteLength,\n    bytesFilled: 0,\n    elementSize: elementSize,\n    ctor: ctor,\n    readerType: 'byob'\n  };\n\n  if (controller._pendingPullIntos.length > 0) {\n    pullIntoDescriptor.buffer = TransferArrayBuffer(pullIntoDescriptor.buffer);\n    controller._pendingPullIntos.push(pullIntoDescriptor);\n\n    // No ReadableByteStreamControllerCallPullIfNeeded() call since:\n    // - No change happens on desiredSize\n    // - The source has already been notified of that there's at least 1 pending read(view)\n\n    return ReadableStreamAddReadIntoRequest(stream);\n  }\n\n  if (stream._state === 'closed') {\n    var emptyView = new view.constructor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);\n    return Promise.resolve(CreateIterResultObject(emptyView, true));\n  }\n\n  if (controller._queueTotalSize > 0) {\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) === true) {\n      var filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);\n\n      ReadableByteStreamControllerHandleQueueDrain(controller);\n\n      return Promise.resolve(CreateIterResultObject(filledView, false));\n    }\n\n    if (controller._closeRequested === true) {\n      var e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      return Promise.reject(e);\n    }\n  }\n\n  pullIntoDescriptor.buffer = TransferArrayBuffer(pullIntoDescriptor.buffer);\n  controller._pendingPullIntos.push(pullIntoDescriptor);\n\n  var promise = ReadableStreamAddReadIntoRequest(stream);\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n\n  return promise;\n}\n\nfunction ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor) {\n  firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);\n\n  assert(firstDescriptor.bytesFilled === 0, 'bytesFilled must be 0');\n\n  var stream = controller._controlledReadableStream;\n  if (ReadableStreamHasBYOBReader(stream) === true) {\n    while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n      var pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);\n      ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);\n    }\n  }\n}\n\nfunction ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, pullIntoDescriptor) {\n  if (pullIntoDescriptor.bytesFilled + bytesWritten > pullIntoDescriptor.byteLength) {\n    throw new RangeError('bytesWritten out of range');\n  }\n\n  ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);\n\n  if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {\n    // TODO: Figure out whether we should detach the buffer or not here.\n    return;\n  }\n\n  ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n  var remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;\n  if (remainderSize > 0) {\n    var end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    var remainder = pullIntoDescriptor.buffer.slice(end - remainderSize, end);\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);\n  }\n\n  pullIntoDescriptor.buffer = TransferArrayBuffer(pullIntoDescriptor.buffer);\n  pullIntoDescriptor.bytesFilled -= remainderSize;\n  ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableStream, pullIntoDescriptor);\n\n  ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInternal(controller, bytesWritten) {\n  var firstDescriptor = controller._pendingPullIntos[0];\n\n  var stream = controller._controlledReadableStream;\n\n  if (stream._state === 'closed') {\n    if (bytesWritten !== 0) {\n      throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');\n    }\n\n    ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);\n  } else {\n    assert(stream._state === 'readable');\n\n    ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);\n  }\n}\n\nfunction ReadableByteStreamControllerShiftPendingPullInto(controller) {\n  var descriptor = controller._pendingPullIntos.shift();\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n  return descriptor;\n}\n\nfunction ReadableByteStreamControllerShouldCallPull(controller) {\n  var stream = controller._controlledReadableStream;\n\n  if (stream._state !== 'readable') {\n    return false;\n  }\n\n  if (controller._closeRequested === true) {\n    return false;\n  }\n\n  if (controller._started === false) {\n    return false;\n  }\n\n  if (ReadableStreamHasDefaultReader(stream) === true && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  if (ReadableStreamHasBYOBReader(stream) === true && ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n    return true;\n  }\n\n  if (ReadableByteStreamControllerGetDesiredSize(controller) > 0) {\n    return true;\n  }\n\n  return false;\n}\n\n// A client of ReadableByteStreamController may use these functions directly to bypass state check.\n\nfunction ReadableByteStreamControllerClose(controller) {\n  var stream = controller._controlledReadableStream;\n\n  assert(controller._closeRequested === false);\n  assert(stream._state === 'readable');\n\n  if (controller._queueTotalSize > 0) {\n    controller._closeRequested = true;\n\n    return;\n  }\n\n  if (controller._pendingPullIntos.length > 0) {\n    var firstPendingPullInto = controller._pendingPullIntos[0];\n    if (firstPendingPullInto.bytesFilled > 0) {\n      var e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      throw e;\n    }\n  }\n\n  ReadableStreamClose(stream);\n}\n\nfunction ReadableByteStreamControllerEnqueue(controller, chunk) {\n  var stream = controller._controlledReadableStream;\n\n  assert(controller._closeRequested === false);\n  assert(stream._state === 'readable');\n\n  var buffer = chunk.buffer;\n  var byteOffset = chunk.byteOffset;\n  var byteLength = chunk.byteLength;\n  var transferredBuffer = TransferArrayBuffer(buffer);\n\n  if (ReadableStreamHasDefaultReader(stream) === true) {\n    if (ReadableStreamGetNumReadRequests(stream) === 0) {\n      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    } else {\n      assert(controller._queue.length === 0);\n\n      var transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);\n      ReadableStreamFulfillReadRequest(stream, transferredView, false);\n    }\n  } else if (ReadableStreamHasBYOBReader(stream) === true) {\n    // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n  } else {\n    assert(IsReadableStreamLocked(stream) === false, 'stream must not be locked');\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n  }\n}\n\nfunction ReadableByteStreamControllerError(controller, e) {\n  var stream = controller._controlledReadableStream;\n\n  assert(stream._state === 'readable');\n\n  ReadableByteStreamControllerClearPendingPullIntos(controller);\n\n  ResetQueue(controller);\n  ReadableStreamError(stream, e);\n}\n\nfunction ReadableByteStreamControllerGetDesiredSize(controller) {\n  var stream = controller._controlledReadableStream;\n  var state = stream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nfunction ReadableByteStreamControllerRespond(controller, bytesWritten) {\n  bytesWritten = Number(bytesWritten);\n  if (IsFiniteNonNegativeNumber(bytesWritten) === false) {\n    throw new RangeError('bytesWritten must be a finite');\n  }\n\n  assert(controller._pendingPullIntos.length > 0);\n\n  ReadableByteStreamControllerRespondInternal(controller, bytesWritten);\n}\n\nfunction ReadableByteStreamControllerRespondWithNewView(controller, view) {\n  assert(controller._pendingPullIntos.length > 0);\n\n  var firstDescriptor = controller._pendingPullIntos[0];\n\n  if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {\n    throw new RangeError('The region specified by view does not match byobRequest');\n  }\n  if (firstDescriptor.byteLength !== view.byteLength) {\n    throw new RangeError('The buffer of view has different capacity than byobRequest');\n  }\n\n  firstDescriptor.buffer = view.buffer;\n\n  ReadableByteStreamControllerRespondInternal(controller, view.byteLength);\n}\n\n// Helper functions for the ReadableStream.\n\nfunction streamBrandCheckException(name) {\n  return new TypeError('ReadableStream.prototype.' + name + ' can only be used on a ReadableStream');\n}\n\n// Helper functions for the readers.\n\nfunction readerLockException(name) {\n  return new TypeError('Cannot ' + name + ' a stream using a released reader');\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nfunction defaultReaderBrandCheckException(name) {\n  return new TypeError('ReadableStreamDefaultReader.prototype.' + name + ' can only be used on a ReadableStreamDefaultReader');\n}\n\nfunction defaultReaderClosedPromiseInitialize(reader) {\n  reader._closedPromise = new Promise(function (resolve, reject) {\n    reader._closedPromise_resolve = resolve;\n    reader._closedPromise_reject = reject;\n  });\n}\n\nfunction defaultReaderClosedPromiseInitializeAsRejected(reader, reason) {\n  reader._closedPromise = Promise.reject(reason);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\nfunction defaultReaderClosedPromiseInitializeAsResolved(reader) {\n  reader._closedPromise = Promise.resolve(undefined);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\nfunction defaultReaderClosedPromiseReject(reader, reason) {\n  assert(reader._closedPromise_resolve !== undefined);\n  assert(reader._closedPromise_reject !== undefined);\n\n  reader._closedPromise_reject(reason);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\nfunction defaultReaderClosedPromiseResetToRejected(reader, reason) {\n  assert(reader._closedPromise_resolve === undefined);\n  assert(reader._closedPromise_reject === undefined);\n\n  reader._closedPromise = Promise.reject(reason);\n}\n\nfunction defaultReaderClosedPromiseResolve(reader) {\n  assert(reader._closedPromise_resolve !== undefined);\n  assert(reader._closedPromise_reject !== undefined);\n\n  reader._closedPromise_resolve(undefined);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nfunction byobReaderBrandCheckException(name) {\n  return new TypeError('ReadableStreamBYOBReader.prototype.' + name + ' can only be used on a ReadableStreamBYOBReader');\n}\n\n// Helper functions for the ReadableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name) {\n  return new TypeError('ReadableStreamDefaultController.prototype.' + name + ' can only be used on a ReadableStreamDefaultController');\n}\n\n// Helper functions for the ReadableStreamBYOBRequest.\n\nfunction byobRequestBrandCheckException(name) {\n  return new TypeError('ReadableStreamBYOBRequest.prototype.' + name + ' can only be used on a ReadableStreamBYOBRequest');\n}\n\n// Helper functions for the ReadableByteStreamController.\n\nfunction byteStreamControllerBrandCheckException(name) {\n  return new TypeError('ReadableByteStreamController.prototype.' + name + ' can only be used on a ReadableByteStreamController');\n}\n\n// Helper function for ReadableStream pipeThrough\n\nfunction ifIsObjectAndHasAPromiseIsHandledInternalSlotSetPromiseIsHandledToTrue(promise) {\n  try {\n    // This relies on the brand-check that is enforced by Promise.prototype.then(). As with the rest of the reference\n    // implementation, it doesn't attempt to do the right thing if someone has modified the global environment.\n    Promise.prototype.then.call(promise, undefined, function () {});\n  } catch (e) {\n    // The brand check failed, therefore the internal slot is not present and there's nothing further to do.\n  }\n}\n\n/***/ }),\n/* 5 */\n/***/ (function(module, exports, __w_pdfjs_require__) {\n\n\"use strict\";\n\n\nvar transformStream = __w_pdfjs_require__(6);\nvar readableStream = __w_pdfjs_require__(4);\nvar writableStream = __w_pdfjs_require__(2);\n\nexports.TransformStream = transformStream.TransformStream;\nexports.ReadableStream = readableStream.ReadableStream;\nexports.IsReadableStreamDisturbed = readableStream.IsReadableStreamDisturbed;\nexports.ReadableStreamDefaultControllerClose = readableStream.ReadableStreamDefaultControllerClose;\nexports.ReadableStreamDefaultControllerEnqueue = readableStream.ReadableStreamDefaultControllerEnqueue;\nexports.ReadableStreamDefaultControllerError = readableStream.ReadableStreamDefaultControllerError;\nexports.ReadableStreamDefaultControllerGetDesiredSize = readableStream.ReadableStreamDefaultControllerGetDesiredSize;\nexports.AcquireWritableStreamDefaultWriter = writableStream.AcquireWritableStreamDefaultWriter;\nexports.IsWritableStream = writableStream.IsWritableStream;\nexports.IsWritableStreamLocked = writableStream.IsWritableStreamLocked;\nexports.WritableStream = writableStream.WritableStream;\nexports.WritableStreamAbort = writableStream.WritableStreamAbort;\nexports.WritableStreamDefaultControllerError = writableStream.WritableStreamDefaultControllerError;\nexports.WritableStreamDefaultWriterCloseWithErrorPropagation = writableStream.WritableStreamDefaultWriterCloseWithErrorPropagation;\nexports.WritableStreamDefaultWriterRelease = writableStream.WritableStreamDefaultWriterRelease;\nexports.WritableStreamDefaultWriterWrite = writableStream.WritableStreamDefaultWriterWrite;\n\n/***/ }),\n/* 6 */\n/***/ (function(module, exports, __w_pdfjs_require__) {\n\n\"use strict\";\n\n\nvar _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if (\"value\" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();\n\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nvar _require = __w_pdfjs_require__(1),\n    assert = _require.assert;\n\nvar _require2 = __w_pdfjs_require__(0),\n    InvokeOrNoop = _require2.InvokeOrNoop,\n    PromiseInvokeOrPerformFallback = _require2.PromiseInvokeOrPerformFallback,\n    PromiseInvokeOrNoop = _require2.PromiseInvokeOrNoop,\n    typeIsObject = _require2.typeIsObject;\n\nvar _require3 = __w_pdfjs_require__(4),\n    ReadableStream = _require3.ReadableStream,\n    ReadableStreamDefaultControllerClose = _require3.ReadableStreamDefaultControllerClose,\n    ReadableStreamDefaultControllerEnqueue = _require3.ReadableStreamDefaultControllerEnqueue,\n    ReadableStreamDefaultControllerError = _require3.ReadableStreamDefaultControllerError,\n    ReadableStreamDefaultControllerGetDesiredSize = _require3.ReadableStreamDefaultControllerGetDesiredSize;\n\nvar _require4 = __w_pdfjs_require__(2),\n    WritableStream = _require4.WritableStream,\n    WritableStreamDefaultControllerError = _require4.WritableStreamDefaultControllerError;\n\n// Methods on the transform stream controller object\n\nfunction TransformStreamCloseReadable(transformStream) {\n  // console.log('TransformStreamCloseReadable()');\n\n  if (transformStream._errored === true) {\n    throw new TypeError('TransformStream is already errored');\n  }\n\n  if (transformStream._readableClosed === true) {\n    throw new TypeError('Readable side is already closed');\n  }\n\n  TransformStreamCloseReadableInternal(transformStream);\n}\n\nfunction TransformStreamEnqueueToReadable(transformStream, chunk) {\n  // console.log('TransformStreamEnqueueToReadable()');\n\n  if (transformStream._errored === true) {\n    throw new TypeError('TransformStream is already errored');\n  }\n\n  if (transformStream._readableClosed === true) {\n    throw new TypeError('Readable side is already closed');\n  }\n\n  // We throttle transformer.transform invocation based on the backpressure of the ReadableStream, but we still\n  // accept TransformStreamEnqueueToReadable() calls.\n\n  var controller = transformStream._readableController;\n\n  try {\n    ReadableStreamDefaultControllerEnqueue(controller, chunk);\n  } catch (e) {\n    // This happens when readableStrategy.size() throws.\n    // The ReadableStream has already errored itself.\n    transformStream._readableClosed = true;\n    TransformStreamErrorIfNeeded(transformStream, e);\n\n    throw transformStream._storedError;\n  }\n\n  var desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);\n  var maybeBackpressure = desiredSize <= 0;\n\n  if (maybeBackpressure === true && transformStream._backpressure === false) {\n    // This allows pull() again. When desiredSize is 0, it's possible that a pull() will happen immediately (but\n    // asynchronously) after this because of pending read()s and set _backpressure back to false.\n    //\n    // If pull() could be called from inside enqueue(), then this logic would be wrong. This cannot happen\n    // because there is always a promise pending from start() or pull() when _backpressure is false.\n    TransformStreamSetBackpressure(transformStream, true);\n  }\n}\n\nfunction TransformStreamError(transformStream, e) {\n  if (transformStream._errored === true) {\n    throw new TypeError('TransformStream is already errored');\n  }\n\n  TransformStreamErrorInternal(transformStream, e);\n}\n\n// Abstract operations.\n\nfunction TransformStreamCloseReadableInternal(transformStream) {\n  assert(transformStream._errored === false);\n  assert(transformStream._readableClosed === false);\n\n  try {\n    ReadableStreamDefaultControllerClose(transformStream._readableController);\n  } catch (e) {\n    assert(false);\n  }\n\n  transformStream._readableClosed = true;\n}\n\nfunction TransformStreamErrorIfNeeded(transformStream, e) {\n  if (transformStream._errored === false) {\n    TransformStreamErrorInternal(transformStream, e);\n  }\n}\n\nfunction TransformStreamErrorInternal(transformStream, e) {\n  // console.log('TransformStreamErrorInternal()');\n\n  assert(transformStream._errored === false);\n\n  transformStream._errored = true;\n  transformStream._storedError = e;\n\n  if (transformStream._writableDone === false) {\n    WritableStreamDefaultControllerError(transformStream._writableController, e);\n  }\n  if (transformStream._readableClosed === false) {\n    ReadableStreamDefaultControllerError(transformStream._readableController, e);\n  }\n}\n\n// Used for preventing the next write() call on TransformStreamSink until there\n// is no longer backpressure.\nfunction TransformStreamReadableReadyPromise(transformStream) {\n  assert(transformStream._backpressureChangePromise !== undefined, '_backpressureChangePromise should have been initialized');\n\n  if (transformStream._backpressure === false) {\n    return Promise.resolve();\n  }\n\n  assert(transformStream._backpressure === true, '_backpressure should have been initialized');\n\n  return transformStream._backpressureChangePromise;\n}\n\nfunction TransformStreamSetBackpressure(transformStream, backpressure) {\n  // console.log(`TransformStreamSetBackpressure(${backpressure})`);\n\n  // Passes also when called during construction.\n  assert(transformStream._backpressure !== backpressure, 'TransformStreamSetBackpressure() should be called only when backpressure is changed');\n\n  if (transformStream._backpressureChangePromise !== undefined) {\n    // The fulfillment value is just for a sanity check.\n    transformStream._backpressureChangePromise_resolve(backpressure);\n  }\n\n  transformStream._backpressureChangePromise = new Promise(function (resolve) {\n    transformStream._backpressureChangePromise_resolve = resolve;\n  });\n\n  transformStream._backpressureChangePromise.then(function (resolution) {\n    assert(resolution !== backpressure, '_backpressureChangePromise should be fulfilled only when backpressure is changed');\n  });\n\n  transformStream._backpressure = backpressure;\n}\n\nfunction TransformStreamDefaultTransform(chunk, transformStreamController) {\n  var transformStream = transformStreamController._controlledTransformStream;\n  TransformStreamEnqueueToReadable(transformStream, chunk);\n  return Promise.resolve();\n}\n\nfunction TransformStreamTransform(transformStream, chunk) {\n  // console.log('TransformStreamTransform()');\n\n  assert(transformStream._errored === false);\n  assert(transformStream._transforming === false);\n  assert(transformStream._backpressure === false);\n\n  transformStream._transforming = true;\n\n  var transformer = transformStream._transformer;\n  var controller = transformStream._transformStreamController;\n\n  var transformPromise = PromiseInvokeOrPerformFallback(transformer, 'transform', [chunk, controller], TransformStreamDefaultTransform, [chunk, controller]);\n\n  return transformPromise.then(function () {\n    transformStream._transforming = false;\n\n    return TransformStreamReadableReadyPromise(transformStream);\n  }, function (e) {\n    TransformStreamErrorIfNeeded(transformStream, e);\n    return Promise.reject(e);\n  });\n}\n\nfunction IsTransformStreamDefaultController(x) {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction IsTransformStream(x) {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {\n    return false;\n  }\n\n  return true;\n}\n\nvar TransformStreamSink = function () {\n  function TransformStreamSink(transformStream, startPromise) {\n    _classCallCheck(this, TransformStreamSink);\n\n    this._transformStream = transformStream;\n    this._startPromise = startPromise;\n  }\n\n  _createClass(TransformStreamSink, [{\n    key: 'start',\n    value: function start(c) {\n      var transformStream = this._transformStream;\n\n      transformStream._writableController = c;\n\n      return this._startPromise.then(function () {\n        return TransformStreamReadableReadyPromise(transformStream);\n      });\n    }\n  }, {\n    key: 'write',\n    value: function write(chunk) {\n      // console.log('TransformStreamSink.write()');\n\n      var transformStream = this._transformStream;\n\n      return TransformStreamTransform(transformStream, chunk);\n    }\n  }, {\n    key: 'abort',\n    value: function abort() {\n      var transformStream = this._transformStream;\n      transformStream._writableDone = true;\n      TransformStreamErrorInternal(transformStream, new TypeError('Writable side aborted'));\n    }\n  }, {\n    key: 'close',\n    value: function close() {\n      // console.log('TransformStreamSink.close()');\n\n      var transformStream = this._transformStream;\n\n      assert(transformStream._transforming === false);\n\n      transformStream._writableDone = true;\n\n      var flushPromise = PromiseInvokeOrNoop(transformStream._transformer, 'flush', [transformStream._transformStreamController]);\n      // Return a promise that is fulfilled with undefined on success.\n      return flushPromise.then(function () {\n        if (transformStream._errored === true) {\n          return Promise.reject(transformStream._storedError);\n        }\n        if (transformStream._readableClosed === false) {\n          TransformStreamCloseReadableInternal(transformStream);\n        }\n        return Promise.resolve();\n      }).catch(function (r) {\n        TransformStreamErrorIfNeeded(transformStream, r);\n        return Promise.reject(transformStream._storedError);\n      });\n    }\n  }]);\n\n  return TransformStreamSink;\n}();\n\nvar TransformStreamSource = function () {\n  function TransformStreamSource(transformStream, startPromise) {\n    _classCallCheck(this, TransformStreamSource);\n\n    this._transformStream = transformStream;\n    this._startPromise = startPromise;\n  }\n\n  _createClass(TransformStreamSource, [{\n    key: 'start',\n    value: function start(c) {\n      var transformStream = this._transformStream;\n\n      transformStream._readableController = c;\n\n      return this._startPromise.then(function () {\n        // Prevent the first pull() call until there is backpressure.\n\n        assert(transformStream._backpressureChangePromise !== undefined, '_backpressureChangePromise should have been initialized');\n\n        if (transformStream._backpressure === true) {\n          return Promise.resolve();\n        }\n\n        assert(transformStream._backpressure === false, '_backpressure should have been initialized');\n\n        return transformStream._backpressureChangePromise;\n      });\n    }\n  }, {\n    key: 'pull',\n    value: function pull() {\n      // console.log('TransformStreamSource.pull()');\n\n      var transformStream = this._transformStream;\n\n      // Invariant. Enforced by the promises returned by start() and pull().\n      assert(transformStream._backpressure === true, 'pull() should be never called while _backpressure is false');\n\n      assert(transformStream._backpressureChangePromise !== undefined, '_backpressureChangePromise should have been initialized');\n\n      TransformStreamSetBackpressure(transformStream, false);\n\n      // Prevent the next pull() call until there is backpressure.\n      return transformStream._backpressureChangePromise;\n    }\n  }, {\n    key: 'cancel',\n    value: function cancel() {\n      var transformStream = this._transformStream;\n      transformStream._readableClosed = true;\n      TransformStreamErrorInternal(transformStream, new TypeError('Readable side canceled'));\n    }\n  }]);\n\n  return TransformStreamSource;\n}();\n\nvar TransformStreamDefaultController = function () {\n  function TransformStreamDefaultController(transformStream) {\n    _classCallCheck(this, TransformStreamDefaultController);\n\n    if (IsTransformStream(transformStream) === false) {\n      throw new TypeError('TransformStreamDefaultController can only be ' + 'constructed with a TransformStream instance');\n    }\n\n    if (transformStream._transformStreamController !== undefined) {\n      throw new TypeError('TransformStreamDefaultController instances can ' + 'only be created by the TransformStream constructor');\n    }\n\n    this._controlledTransformStream = transformStream;\n  }\n\n  _createClass(TransformStreamDefaultController, [{\n    key: 'enqueue',\n    value: function enqueue(chunk) {\n      if (IsTransformStreamDefaultController(this) === false) {\n        throw defaultControllerBrandCheckException('enqueue');\n      }\n\n      TransformStreamEnqueueToReadable(this._controlledTransformStream, chunk);\n    }\n  }, {\n    key: 'close',\n    value: function close() {\n      if (IsTransformStreamDefaultController(this) === false) {\n        throw defaultControllerBrandCheckException('close');\n      }\n\n      TransformStreamCloseReadable(this._controlledTransformStream);\n    }\n  }, {\n    key: 'error',\n    value: function error(reason) {\n      if (IsTransformStreamDefaultController(this) === false) {\n        throw defaultControllerBrandCheckException('error');\n      }\n\n      TransformStreamError(this._controlledTransformStream, reason);\n    }\n  }, {\n    key: 'desiredSize',\n    get: function get() {\n      if (IsTransformStreamDefaultController(this) === false) {\n        throw defaultControllerBrandCheckException('desiredSize');\n      }\n\n      var transformStream = this._controlledTransformStream;\n      var readableController = transformStream._readableController;\n\n      return ReadableStreamDefaultControllerGetDesiredSize(readableController);\n    }\n  }]);\n\n  return TransformStreamDefaultController;\n}();\n\nvar TransformStream = function () {\n  function TransformStream() {\n    var transformer = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};\n\n    _classCallCheck(this, TransformStream);\n\n    this._transformer = transformer;\n    var readableStrategy = transformer.readableStrategy,\n        writableStrategy = transformer.writableStrategy;\n\n\n    this._transforming = false;\n    this._errored = false;\n    this._storedError = undefined;\n\n    this._writableController = undefined;\n    this._readableController = undefined;\n    this._transformStreamController = undefined;\n\n    this._writableDone = false;\n    this._readableClosed = false;\n\n    this._backpressure = undefined;\n    this._backpressureChangePromise = undefined;\n    this._backpressureChangePromise_resolve = undefined;\n\n    this._transformStreamController = new TransformStreamDefaultController(this);\n\n    var startPromise_resolve = void 0;\n    var startPromise = new Promise(function (resolve) {\n      startPromise_resolve = resolve;\n    });\n\n    var source = new TransformStreamSource(this, startPromise);\n\n    this._readable = new ReadableStream(source, readableStrategy);\n\n    var sink = new TransformStreamSink(this, startPromise);\n\n    this._writable = new WritableStream(sink, writableStrategy);\n\n    assert(this._writableController !== undefined);\n    assert(this._readableController !== undefined);\n\n    var desiredSize = ReadableStreamDefaultControllerGetDesiredSize(this._readableController);\n    // Set _backpressure based on desiredSize. As there is no read() at this point, we can just interpret\n    // desiredSize being non-positive as backpressure.\n    TransformStreamSetBackpressure(this, desiredSize <= 0);\n\n    var transformStream = this;\n    var startResult = InvokeOrNoop(transformer, 'start', [transformStream._transformStreamController]);\n    startPromise_resolve(startResult);\n    startPromise.catch(function (e) {\n      // The underlyingSink and underlyingSource will error the readable and writable ends on their own.\n      if (transformStream._errored === false) {\n        transformStream._errored = true;\n        transformStream._storedError = e;\n      }\n    });\n  }\n\n  _createClass(TransformStream, [{\n    key: 'readable',\n    get: function get() {\n      if (IsTransformStream(this) === false) {\n        throw streamBrandCheckException('readable');\n      }\n\n      return this._readable;\n    }\n  }, {\n    key: 'writable',\n    get: function get() {\n      if (IsTransformStream(this) === false) {\n        throw streamBrandCheckException('writable');\n      }\n\n      return this._writable;\n    }\n  }]);\n\n  return TransformStream;\n}();\n\nmodule.exports = { TransformStream: TransformStream };\n\n// Helper functions for the TransformStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name) {\n  return new TypeError('TransformStreamDefaultController.prototype.' + name + ' can only be used on a TransformStreamDefaultController');\n}\n\n// Helper functions for the TransformStream.\n\nfunction streamBrandCheckException(name) {\n  return new TypeError('TransformStream.prototype.' + name + ' can only be used on a TransformStream');\n}\n\n/***/ }),\n/* 7 */\n/***/ (function(module, exports, __w_pdfjs_require__) {\n\nmodule.exports = __w_pdfjs_require__(5);\n\n\n/***/ })\n/******/ ])));","/* Copyright 2018 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n/* eslint-disable no-restricted-globals */\n\nif (typeof PDFJSDev !== 'undefined' && !PDFJSDev.test('GENERIC')) {\n  // The `URL` constructor is assumed to be available in the extension builds.\n  exports.URL = URL;\n} else {\n  let isURLSupported = false;\n  try {\n    if (typeof URL === 'function' && typeof URL.prototype === 'object' &&\n        ('origin' in URL.prototype)) {\n      const u = new URL('b', 'http://a');\n      u.pathname = 'c%20d';\n      isURLSupported = (u.href === 'http://a/c%20d');\n    }\n  } catch (ex) {\n    // The `URL` constructor cannot be used.\n  }\n\n  if (isURLSupported) {\n    exports.URL = URL;\n  } else if (typeof PDFJSDev !== 'undefined' &&\n             PDFJSDev.test('IMAGE_DECODERS')) {\n    class DummyURL {\n      constructor() {\n        throw new Error('The current image decoders doesn\\'t utilize the ' +\n                        '`URL` constructor, hence it shouldn\\'t need to be ' +\n                        'polyfilled for the IMAGE_DECODERS build target.');\n      }\n    }\n    exports.URL = DummyURL;\n  } else {\n    const PolyfillURL = require('../../external/url/url-lib').URL;\n\n    // Attempt to copy over the static methods.\n    const OriginalURL = require('./global_scope').URL;\n    if (OriginalURL) {\n      PolyfillURL.createObjectURL = function(blob) {\n        // IE extension allows a second optional options argument, see\n        // http://msdn.microsoft.com/en-us/library/ie/hh772302(v=vs.85).aspx\n        return OriginalURL.createObjectURL.apply(OriginalURL, arguments);\n      };\n      PolyfillURL.revokeObjectURL = function(url) {\n        OriginalURL.revokeObjectURL(url);\n      };\n    }\n    exports.URL = PolyfillURL;\n  }\n}\n","/* Any copyright is dedicated to the Public Domain.\n * http://creativecommons.org/publicdomain/zero/1.0/\n */\n\n// Polyfill obtained from: https://github.com/Polymer/URL\n\n(function URLConstructorClosure() {\n  'use strict';\n\n  var relative = Object.create(null);\n  relative['ftp'] = 21;\n  relative['file'] = 0;\n  relative['gopher'] = 70;\n  relative['http'] = 80;\n  relative['https'] = 443;\n  relative['ws'] = 80;\n  relative['wss'] = 443;\n\n  var relativePathDotMapping = Object.create(null);\n  relativePathDotMapping['%2e'] = '.';\n  relativePathDotMapping['.%2e'] = '..';\n  relativePathDotMapping['%2e.'] = '..';\n  relativePathDotMapping['%2e%2e'] = '..';\n\n  function isRelativeScheme(scheme) {\n    return relative[scheme] !== undefined;\n  }\n\n  function invalid() {\n    clear.call(this);\n    this._isInvalid = true;\n  }\n\n  function IDNAToASCII(h) {\n    if (h === '') {\n      invalid.call(this);\n    }\n    // XXX\n    return h.toLowerCase();\n  }\n\n  function percentEscape(c) {\n    var unicode = c.charCodeAt(0);\n    if (unicode > 0x20 &&\n       unicode < 0x7F &&\n       // \" # < > ? `\n       [0x22, 0x23, 0x3C, 0x3E, 0x3F, 0x60].indexOf(unicode) === -1\n      ) {\n      return c;\n    }\n    return encodeURIComponent(c);\n  }\n\n  function percentEscapeQuery(c) {\n    // XXX This actually needs to encode c using encoding and then\n    // convert the bytes one-by-one.\n\n    var unicode = c.charCodeAt(0);\n    if (unicode > 0x20 &&\n       unicode < 0x7F &&\n       // \" # < > ` (do not escape '?')\n       [0x22, 0x23, 0x3C, 0x3E, 0x60].indexOf(unicode) === -1\n      ) {\n      return c;\n    }\n    return encodeURIComponent(c);\n  }\n\n  var EOF, ALPHA = /[a-zA-Z]/,\n      ALPHANUMERIC = /[a-zA-Z0-9\\+\\-\\.]/;\n\n  function parse(input, stateOverride, base) {\n    function err(message) {\n      errors.push(message);\n    }\n\n    var state = stateOverride || 'scheme start',\n        cursor = 0,\n        buffer = '',\n        seenAt = false,\n        seenBracket = false,\n        errors = [];\n\n    loop: while ((input[cursor - 1] !== EOF || cursor === 0) &&\n                 !this._isInvalid) {\n      var c = input[cursor];\n      switch (state) {\n        case 'scheme start':\n          if (c && ALPHA.test(c)) {\n            buffer += c.toLowerCase(); // ASCII-safe\n            state = 'scheme';\n          } else if (!stateOverride) {\n            buffer = '';\n            state = 'no scheme';\n            continue;\n          } else {\n            err('Invalid scheme.');\n            break loop;\n          }\n          break;\n\n        case 'scheme':\n          if (c && ALPHANUMERIC.test(c)) {\n            buffer += c.toLowerCase(); // ASCII-safe\n          } else if (c === ':') {\n            this._scheme = buffer;\n            buffer = '';\n            if (stateOverride) {\n              break loop;\n            }\n            if (isRelativeScheme(this._scheme)) {\n              this._isRelative = true;\n            }\n            if (this._scheme === 'file') {\n              state = 'relative';\n            } else if (this._isRelative && base &&\n                       base._scheme === this._scheme) {\n              state = 'relative or authority';\n            } else if (this._isRelative) {\n              state = 'authority first slash';\n            } else {\n              state = 'scheme data';\n            }\n          } else if (!stateOverride) {\n            buffer = '';\n            cursor = 0;\n            state = 'no scheme';\n            continue;\n          } else if (c === EOF) {\n            break loop;\n          } else {\n            err('Code point not allowed in scheme: ' + c);\n            break loop;\n          }\n          break;\n\n        case 'scheme data':\n          if (c === '?') {\n            this._query = '?';\n            state = 'query';\n          } else if (c === '#') {\n            this._fragment = '#';\n            state = 'fragment';\n          } else {\n            // XXX error handling\n            if (c !== EOF && c !== '\\t' && c !== '\\n' && c !== '\\r') {\n              this._schemeData += percentEscape(c);\n            }\n          }\n          break;\n\n        case 'no scheme':\n          if (!base || !(isRelativeScheme(base._scheme))) {\n            err('Missing scheme.');\n            invalid.call(this);\n          } else {\n            state = 'relative';\n            continue;\n          }\n          break;\n\n        case 'relative or authority':\n          if (c === '/' && input[cursor + 1] === '/') {\n            state = 'authority ignore slashes';\n          } else {\n            err('Expected /, got: ' + c);\n            state = 'relative';\n            continue;\n          }\n          break;\n\n        case 'relative':\n          this._isRelative = true;\n          if (this._scheme !== 'file') {\n            this._scheme = base._scheme;\n          }\n          if (c === EOF) {\n            this._host = base._host;\n            this._port = base._port;\n            this._path = base._path.slice();\n            this._query = base._query;\n            this._username = base._username;\n            this._password = base._password;\n            break loop;\n          } else if (c === '/' || c === '\\\\') {\n            if (c === '\\\\') {\n              err('\\\\ is an invalid code point.');\n            }\n            state = 'relative slash';\n          } else if (c === '?') {\n            this._host = base._host;\n            this._port = base._port;\n            this._path = base._path.slice();\n            this._query = '?';\n            this._username = base._username;\n            this._password = base._password;\n            state = 'query';\n          } else if (c === '#') {\n            this._host = base._host;\n            this._port = base._port;\n            this._path = base._path.slice();\n            this._query = base._query;\n            this._fragment = '#';\n            this._username = base._username;\n            this._password = base._password;\n            state = 'fragment';\n          } else {\n            var nextC = input[cursor + 1];\n            var nextNextC = input[cursor + 2];\n            if (this._scheme !== 'file' || !ALPHA.test(c) ||\n                (nextC !== ':' && nextC !== '|') ||\n                (nextNextC !== EOF && nextNextC !== '/' && nextNextC !== '\\\\' &&\n                 nextNextC !== '?' && nextNextC !== '#')) {\n              this._host = base._host;\n              this._port = base._port;\n              this._username = base._username;\n              this._password = base._password;\n              this._path = base._path.slice();\n              this._path.pop();\n            }\n            state = 'relative path';\n            continue;\n          }\n          break;\n\n        case 'relative slash':\n          if (c === '/' || c === '\\\\') {\n            if (c === '\\\\') {\n              err('\\\\ is an invalid code point.');\n            }\n            if (this._scheme === 'file') {\n              state = 'file host';\n            } else {\n              state = 'authority ignore slashes';\n            }\n          } else {\n            if (this._scheme !== 'file') {\n              this._host = base._host;\n              this._port = base._port;\n              this._username = base._username;\n              this._password = base._password;\n            }\n            state = 'relative path';\n            continue;\n          }\n          break;\n\n        case 'authority first slash':\n          if (c === '/') {\n            state = 'authority second slash';\n          } else {\n            err('Expected \\'/\\', got: ' + c);\n            state = 'authority ignore slashes';\n            continue;\n          }\n          break;\n\n        case 'authority second slash':\n          state = 'authority ignore slashes';\n          if (c !== '/') {\n            err('Expected \\'/\\', got: ' + c);\n            continue;\n          }\n          break;\n\n        case 'authority ignore slashes':\n          if (c !== '/' && c !== '\\\\') {\n            state = 'authority';\n            continue;\n          } else {\n            err('Expected authority, got: ' + c);\n          }\n          break;\n\n        case 'authority':\n          if (c === '@') {\n            if (seenAt) {\n              err('@ already seen.');\n              buffer += '%40';\n            }\n            seenAt = true;\n            for (var i = 0; i < buffer.length; i++) {\n              var cp = buffer[i];\n              if (cp === '\\t' || cp === '\\n' || cp === '\\r') {\n                err('Invalid whitespace in authority.');\n                continue;\n              }\n              // XXX check URL code points\n              if (cp === ':' && this._password === null) {\n                this._password = '';\n                continue;\n              }\n              var tempC = percentEscape(cp);\n              if (this._password !== null) {\n                this._password += tempC;\n              } else {\n                this._username += tempC;\n              }\n            }\n            buffer = '';\n          } else if (c === EOF || c === '/' || c === '\\\\' ||\n                     c === '?' || c === '#') {\n            cursor -= buffer.length;\n            buffer = '';\n            state = 'host';\n            continue;\n          } else {\n            buffer += c;\n          }\n          break;\n\n        case 'file host':\n          if (c === EOF || c === '/' || c === '\\\\' || c === '?' || c === '#') {\n            if (buffer.length === 2 && ALPHA.test(buffer[0]) &&\n                (buffer[1] === ':' || buffer[1] === '|')) {\n              state = 'relative path';\n            } else if (buffer.length === 0) {\n              state = 'relative path start';\n            } else {\n              this._host = IDNAToASCII.call(this, buffer);\n              buffer = '';\n              state = 'relative path start';\n            }\n            continue;\n          } else if (c === '\\t' || c === '\\n' || c === '\\r') {\n            err('Invalid whitespace in file host.');\n          } else {\n            buffer += c;\n          }\n          break;\n\n        case 'host':\n        case 'hostname':\n          if (c === ':' && !seenBracket) {\n            // XXX host parsing\n            this._host = IDNAToASCII.call(this, buffer);\n            buffer = '';\n            state = 'port';\n            if (stateOverride === 'hostname') {\n              break loop;\n            }\n          } else if (c === EOF || c === '/' ||\n                     c === '\\\\' || c === '?' || c === '#') {\n            this._host = IDNAToASCII.call(this, buffer);\n            buffer = '';\n            state = 'relative path start';\n            if (stateOverride) {\n              break loop;\n            }\n            continue;\n          } else if (c !== '\\t' && c !== '\\n' && c !== '\\r') {\n            if (c === '[') {\n              seenBracket = true;\n            } else if (c === ']') {\n              seenBracket = false;\n            }\n            buffer += c;\n          } else {\n            err('Invalid code point in host/hostname: ' + c);\n          }\n          break;\n\n        case 'port':\n          if (/[0-9]/.test(c)) {\n            buffer += c;\n          } else if (c === EOF || c === '/' || c === '\\\\' ||\n                     c === '?' || c === '#' || stateOverride) {\n            if (buffer !== '') {\n              var temp = parseInt(buffer, 10);\n              if (temp !== relative[this._scheme]) {\n                this._port = temp + '';\n              }\n              buffer = '';\n            }\n            if (stateOverride) {\n              break loop;\n            }\n            state = 'relative path start';\n            continue;\n          } else if (c === '\\t' || c === '\\n' || c === '\\r') {\n            err('Invalid code point in port: ' + c);\n          } else {\n            invalid.call(this);\n          }\n          break;\n\n        case 'relative path start':\n          if (c === '\\\\') {\n            err('\\'\\\\\\' not allowed in path.');\n          }\n          state = 'relative path';\n          if (c !== '/' && c !== '\\\\') {\n            continue;\n          }\n          break;\n\n        case 'relative path':\n          if (c === EOF || c === '/' || c === '\\\\' ||\n              (!stateOverride && (c === '?' || c === '#'))) {\n            if (c === '\\\\') {\n              err('\\\\ not allowed in relative path.');\n            }\n            var tmp;\n            if ((tmp = relativePathDotMapping[buffer.toLowerCase()])) {\n              buffer = tmp;\n            }\n            if (buffer === '..') {\n              this._path.pop();\n              if (c !== '/' && c !== '\\\\') {\n                this._path.push('');\n              }\n            } else if (buffer === '.' && c !== '/' && c !== '\\\\') {\n              this._path.push('');\n            } else if (buffer !== '.') {\n              if (this._scheme === 'file' && this._path.length === 0 &&\n                  buffer.length === 2 && ALPHA.test(buffer[0]) &&\n                  buffer[1] === '|') {\n                buffer = buffer[0] + ':';\n              }\n              this._path.push(buffer);\n            }\n            buffer = '';\n            if (c === '?') {\n              this._query = '?';\n              state = 'query';\n            } else if (c === '#') {\n              this._fragment = '#';\n              state = 'fragment';\n            }\n          } else if (c !== '\\t' && c !== '\\n' && c !== '\\r') {\n            buffer += percentEscape(c);\n          }\n          break;\n\n        case 'query':\n          if (!stateOverride && c === '#') {\n            this._fragment = '#';\n            state = 'fragment';\n          } else if (c !== EOF && c !== '\\t' && c !== '\\n' && c !== '\\r') {\n            this._query += percentEscapeQuery(c);\n          }\n          break;\n\n        case 'fragment':\n          if (c !== EOF && c !== '\\t' && c !== '\\n' && c !== '\\r') {\n            this._fragment += c;\n          }\n          break;\n      }\n\n      cursor++;\n    }\n  }\n\n  function clear() {\n    this._scheme = '';\n    this._schemeData = '';\n    this._username = '';\n    this._password = null;\n    this._host = '';\n    this._port = '';\n    this._path = [];\n    this._query = '';\n    this._fragment = '';\n    this._isInvalid = false;\n    this._isRelative = false;\n  }\n\n  // Does not process domain names or IP addresses.\n  // Does not handle encoding for the query parameter.\n  function JURL(url, base /* , encoding */) {\n    if (base !== undefined && !(base instanceof JURL)) {\n      base = new JURL(String(base));\n    }\n\n    this._url = url;\n    clear.call(this);\n\n    var input = url.replace(/^[ \\t\\r\\n\\f]+|[ \\t\\r\\n\\f]+$/g, '');\n    // encoding = encoding || 'utf-8'\n\n    parse.call(this, input, null, base);\n  }\n\n  JURL.prototype = {\n    toString() {\n      return this.href;\n    },\n    get href() {\n      if (this._isInvalid) {\n        return this._url;\n      }\n      var authority = '';\n      if (this._username !== '' || this._password !== null) {\n        authority = this._username +\n          (this._password !== null ? ':' + this._password : '') + '@';\n      }\n\n      return this.protocol +\n          (this._isRelative ? '//' + authority + this.host : '') +\n          this.pathname + this._query + this._fragment;\n    },\n    // The named parameter should be different from the setter's function name.\n    // Otherwise Safari 5 will throw an error (see issue 8541)\n    set href(value) {\n      clear.call(this);\n      parse.call(this, value);\n    },\n\n    get protocol() {\n      return this._scheme + ':';\n    },\n    set protocol(value) {\n      if (this._isInvalid) {\n        return;\n      }\n      parse.call(this, value + ':', 'scheme start');\n    },\n\n    get host() {\n      return this._isInvalid ? '' : this._port ?\n          this._host + ':' + this._port : this._host;\n    },\n    set host(value) {\n      if (this._isInvalid || !this._isRelative) {\n        return;\n      }\n      parse.call(this, value, 'host');\n    },\n\n    get hostname() {\n      return this._host;\n    },\n    set hostname(value) {\n      if (this._isInvalid || !this._isRelative) {\n        return;\n      }\n      parse.call(this, value, 'hostname');\n    },\n\n    get port() {\n      return this._port;\n    },\n    set port(value) {\n      if (this._isInvalid || !this._isRelative) {\n        return;\n      }\n      parse.call(this, value, 'port');\n    },\n\n    get pathname() {\n      return this._isInvalid ? '' : this._isRelative ?\n          '/' + this._path.join('/') : this._schemeData;\n    },\n    set pathname(value) {\n      if (this._isInvalid || !this._isRelative) {\n        return;\n      }\n      this._path = [];\n      parse.call(this, value, 'relative path start');\n    },\n\n    get search() {\n      return this._isInvalid || !this._query || this._query === '?' ?\n          '' : this._query;\n    },\n    set search(value) {\n      if (this._isInvalid || !this._isRelative) {\n        return;\n      }\n      this._query = '?';\n      if (value[0] === '?') {\n        value = value.slice(1);\n      }\n      parse.call(this, value, 'query');\n    },\n\n    get hash() {\n      return this._isInvalid || !this._fragment || this._fragment === '#' ?\n          '' : this._fragment;\n    },\n    set hash(value) {\n      if (this._isInvalid) {\n        return;\n      }\n      this._fragment = '#';\n      if (value[0] === '#') {\n        value = value.slice(1);\n      }\n      parse.call(this, value, 'fragment');\n    },\n\n    get origin() {\n      var host;\n      if (this._isInvalid || !this._scheme) {\n        return '';\n      }\n      // javascript: Gecko returns String(\"\"), WebKit/Blink String(\"null\")\n      // Gecko throws error for \"data://\"\n      // data: Gecko returns \"\", Blink returns \"data://\", WebKit returns \"null\"\n      // Gecko returns String(\"\") for file: mailto:\n      // WebKit/Blink returns String(\"SCHEME://\") for file: mailto:\n      switch (this._scheme) {\n        case 'data':\n        case 'file':\n        case 'javascript':\n        case 'mailto':\n          return 'null';\n        case 'blob':\n          // Special case of blob: -- returns valid origin of _schemeData.\n          try {\n            return new JURL(this._schemeData).origin || 'null';\n          } catch (_) {\n            // Invalid _schemeData origin -- ignoring errors.\n          }\n          return 'null';\n      }\n      host = this.host;\n      if (!host) {\n        return '';\n      }\n      return this._scheme + '://' + host;\n    },\n  };\n\n  exports.URL = JURL;\n})();\n","/* Copyright 2012 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n/* globals requirejs, __non_webpack_require__ */\n/* eslint no-var: error */\n\nimport {\n  assert, createPromiseCapability, deprecated, getVerbosityLevel, info,\n  InvalidPDFException, isArrayBuffer, isSameOrigin, MissingPDFException,\n  NativeImageDecoding, PasswordException, setVerbosityLevel, shadow,\n  stringToBytes, UnexpectedResponseException, UnknownErrorException,\n  unreachable, URL, warn\n} from '../shared/util';\nimport {\n  DOMCanvasFactory, DOMCMapReaderFactory, DummyStatTimer, loadScript,\n  PageViewport, RenderingCancelledException, StatTimer\n} from './dom_utils';\nimport { FontFaceObject, FontLoader } from './font_loader';\nimport { apiCompatibilityParams } from './api_compatibility';\nimport { CanvasGraphics } from './canvas';\nimport globalScope from '../shared/global_scope';\nimport { GlobalWorkerOptions } from './worker_options';\nimport { MessageHandler } from '../shared/message_handler';\nimport { Metadata } from './metadata';\nimport { PDFDataTransportStream } from './transport_stream';\nimport { WebGLContext } from './webgl';\n\nconst DEFAULT_RANGE_CHUNK_SIZE = 65536; // 2^16 = 65536\n\nlet isWorkerDisabled = false;\nlet fallbackWorkerSrc;\n\nlet fakeWorkerFilesLoader = null;\nif (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('GENERIC')) {\n  let useRequireEnsure = false;\n  // For GENERIC build we need to add support for different fake file loaders\n  // for different frameworks.\n  if (typeof window === 'undefined') {\n    // node.js - disable worker and set require.ensure.\n    isWorkerDisabled = true;\n    if (typeof __non_webpack_require__.ensure === 'undefined') {\n      __non_webpack_require__.ensure = __non_webpack_require__('node-ensure');\n    }\n    useRequireEnsure = true;\n  } else if (typeof __non_webpack_require__ !== 'undefined' &&\n             typeof __non_webpack_require__.ensure === 'function') {\n    useRequireEnsure = true;\n  }\n  if (typeof requirejs !== 'undefined' && requirejs.toUrl) {\n    fallbackWorkerSrc = requirejs.toUrl('pdfjs-dist/build/pdf.worker.js');\n  }\n  const dynamicLoaderSupported =\n    typeof requirejs !== 'undefined' && requirejs.load;\n  fakeWorkerFilesLoader = useRequireEnsure ? (function() {\n    return new Promise(function(resolve, reject) {\n      __non_webpack_require__.ensure([], function() {\n        try {\n          let worker;\n          if (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('LIB')) {\n            worker = __non_webpack_require__('../pdf.worker.js');\n          } else {\n            worker = __non_webpack_require__('./pdf.worker.js');\n          }\n          resolve(worker.WorkerMessageHandler);\n        } catch (ex) {\n          reject(ex);\n        }\n      }, reject, 'pdfjsWorker');\n    });\n  }) : dynamicLoaderSupported ? (function() {\n    return new Promise(function(resolve, reject) {\n      requirejs(['pdfjs-dist/build/pdf.worker'], function(worker) {\n        try {\n          resolve(worker.WorkerMessageHandler);\n        } catch (ex) {\n          reject(ex);\n        }\n      }, reject);\n    });\n  }) : null;\n\n  if (!fallbackWorkerSrc && typeof document === 'object' &&\n      'currentScript' in document) {\n    const pdfjsFilePath = document.currentScript && document.currentScript.src;\n    if (pdfjsFilePath) {\n      fallbackWorkerSrc =\n        pdfjsFilePath.replace(/(\\.(?:min\\.)?js)(\\?.*)?$/i, '.worker$1$2');\n    }\n  }\n}\n\n/**\n * @typedef {function} IPDFStreamFactory\n * @param {DocumentInitParameters} params The document initialization\n * parameters. The \"url\" key is always present.\n * @return {IPDFStream}\n */\n\n/** @type IPDFStreamFactory */\nlet createPDFNetworkStream;\n\n/**\n * Sets the function that instantiates a IPDFStream as an alternative PDF data\n * transport.\n * @param {IPDFStreamFactory} pdfNetworkStreamFactory - the factory function\n * that takes document initialization parameters (including a \"url\") and returns\n * an instance of IPDFStream.\n */\nfunction setPDFNetworkStreamFactory(pdfNetworkStreamFactory) {\n  createPDFNetworkStream = pdfNetworkStreamFactory;\n}\n\n/**\n * Document initialization / loading parameters object.\n *\n * @typedef {Object} DocumentInitParameters\n * @property {string}     url   - The URL of the PDF.\n * @property {TypedArray|Array|string} data - Binary PDF data. Use typed arrays\n *   (Uint8Array) to improve the memory usage. If PDF data is BASE64-encoded,\n *   use atob() to convert it to a binary string first.\n * @property {Object}     httpHeaders - Basic authentication headers.\n * @property {boolean}    withCredentials - Indicates whether or not cross-site\n *   Access-Control requests should be made using credentials such as cookies\n *   or authorization headers. The default is false.\n * @property {string}     password - For decrypting password-protected PDFs.\n * @property {TypedArray} initialData - A typed array with the first portion or\n *   all of the pdf data. Used by the extension since some data is already\n *   loaded before the switch to range requests.\n * @property {number}     length - The PDF file length. It's used for progress\n *   reports and range requests operations.\n * @property {PDFDataRangeTransport} range\n * @property {number}     rangeChunkSize - Optional parameter to specify\n *   maximum number of bytes fetched per range request. The default value is\n *   2^16 = 65536.\n * @property {PDFWorker}  worker - (optional) The worker that will be used for\n *   the loading and parsing of the PDF data.\n * @property {boolean} postMessageTransfers - (optional) Enables transfer usage\n *   in postMessage for ArrayBuffers. The default value is `true`.\n * @property {number} verbosity - (optional) Controls the logging level; the\n *   constants from {VerbosityLevel} should be used.\n * @property {string} docBaseUrl - (optional) The base URL of the document,\n *   used when attempting to recover valid absolute URLs for annotations, and\n *   outline items, that (incorrectly) only specify relative URLs.\n * @property {string} nativeImageDecoderSupport - (optional) Strategy for\n *   decoding certain (simple) JPEG images in the browser. This is useful for\n *   environments without DOM image and canvas support, such as e.g. Node.js.\n *   Valid values are 'decode', 'display' or 'none'; where 'decode' is intended\n *   for browsers with full image/canvas support, 'display' for environments\n *   with limited image support through stubs (useful for SVG conversion),\n *   and 'none' where JPEG images will be decoded entirely by PDF.js.\n *   The default value is 'decode'.\n * @property {string} cMapUrl - (optional) The URL where the predefined\n *   Adobe CMaps are located. Include trailing slash.\n * @property {boolean} cMapPacked - (optional) Specifies if the Adobe CMaps are\n *   binary packed.\n * @property {Object} CMapReaderFactory - (optional) The factory that will be\n *   used when reading built-in CMap files. Providing a custom factory is useful\n *   for environments without `XMLHttpRequest` support, such as e.g. Node.js.\n *   The default value is {DOMCMapReaderFactory}.\n * @property {boolean} stopAtErrors - (optional) Reject certain promises, e.g.\n *   `getOperatorList`, `getTextContent`, and `RenderTask`, when the associated\n *   PDF data cannot be successfully parsed, instead of attempting to recover\n *   whatever possible of the data. The default value is `false`.\n * @property {number} maxImageSize - (optional) The maximum allowed image size\n *   in total pixels, i.e. width * height. Images above this value will not be\n *   rendered. Use -1 for no limit, which is also the default value.\n * @property {boolean} isEvalSupported - (optional) Determines if we can eval\n *   strings as JS. Primarily used to improve performance of font rendering,\n *   and when parsing PDF functions. The default value is `true`.\n * @property {boolean} disableFontFace - (optional) By default fonts are\n *   converted to OpenType fonts and loaded via font face rules. If disabled,\n *   fonts will be rendered using a built-in font renderer that constructs the\n *   glyphs with primitive path commands. The default value is `false`.\n * @property {boolean} disableRange - (optional) Disable range request loading\n *   of PDF files. When enabled, and if the server supports partial content\n *   requests, then the PDF will be fetched in chunks.\n *   The default value is `false`.\n * @property {boolean} disableStream - (optional) Disable streaming of PDF file\n *   data. By default PDF.js attempts to load PDFs in chunks.\n *   The default value is `false`.\n * @property {boolean} disableAutoFetch - (optional) Disable pre-fetching of PDF\n *   file data. When range requests are enabled PDF.js will automatically keep\n *   fetching more data even if it isn't needed to display the current page.\n *   The default value is `false`.\n *   NOTE: It is also necessary to disable streaming, see above,\n *         in order for disabling of pre-fetching to work correctly.\n * @property {boolean} disableCreateObjectURL - (optional) Disable the use of\n *   `URL.createObjectURL`, for compatibility with older browsers.\n *   The default value is `false`.\n * @property {boolean} pdfBug - (optional) Enables special hooks for debugging\n *   PDF.js (see `web/debugger.js`). The default value is `false`.\n */\n\n/**\n * @typedef {Object} PDFDocumentStats\n * @property {Array} streamTypes - Used stream types in the document (an item\n *   is set to true if specific stream ID was used in the document).\n * @property {Array} fontTypes - Used font type in the document (an item is set\n *   to true if specific font ID was used in the document).\n */\n\n/**\n * This is the main entry point for loading a PDF and interacting with it.\n * NOTE: If a URL is used to fetch the PDF data a standard XMLHttpRequest(XHR)\n * is used, which means it must follow the same origin rules that any XHR does\n * e.g. No cross domain requests without CORS.\n *\n * @param {string|TypedArray|DocumentInitParameters|PDFDataRangeTransport} src\n * Can be a url to where a PDF is located, a typed array (Uint8Array)\n * already populated with data or parameter object.\n *\n * @return {PDFDocumentLoadingTask}\n */\nfunction getDocument(src) {\n  const task = new PDFDocumentLoadingTask();\n\n  let source;\n  if (typeof src === 'string') {\n    source = { url: src, };\n  } else if (isArrayBuffer(src)) {\n    source = { data: src, };\n  } else if (src instanceof PDFDataRangeTransport) {\n    source = { range: src, };\n  } else {\n    if (typeof src !== 'object') {\n      throw new Error('Invalid parameter in getDocument, ' +\n                      'need either Uint8Array, string or a parameter object');\n    }\n    if (!src.url && !src.data && !src.range) {\n      throw new Error(\n        'Invalid parameter object: need either .data, .range or .url');\n    }\n    source = src;\n  }\n  const params = Object.create(null);\n  let rangeTransport = null, worker = null;\n\n  for (const key in source) {\n    if (key === 'url' && typeof window !== 'undefined') {\n      // The full path is required in the 'url' field.\n      params[key] = new URL(source[key], window.location).href;\n      continue;\n    } else if (key === 'range') {\n      rangeTransport = source[key];\n      continue;\n    } else if (key === 'worker') {\n      worker = source[key];\n      continue;\n    } else if (key === 'data' && !(source[key] instanceof Uint8Array)) {\n      // Converting string or array-like data to Uint8Array.\n      const pdfBytes = source[key];\n      if (typeof pdfBytes === 'string') {\n        params[key] = stringToBytes(pdfBytes);\n      } else if (typeof pdfBytes === 'object' && pdfBytes !== null &&\n                 !isNaN(pdfBytes.length)) {\n        params[key] = new Uint8Array(pdfBytes);\n      } else if (isArrayBuffer(pdfBytes)) {\n        params[key] = new Uint8Array(pdfBytes);\n      } else {\n        throw new Error('Invalid PDF binary data: either typed array, ' +\n                        'string or array-like object is expected in the ' +\n                        'data property.');\n      }\n      continue;\n    }\n    params[key] = source[key];\n  }\n\n  params.rangeChunkSize = params.rangeChunkSize || DEFAULT_RANGE_CHUNK_SIZE;\n  params.CMapReaderFactory = params.CMapReaderFactory || DOMCMapReaderFactory;\n  params.ignoreErrors = params.stopAtErrors !== true;\n  params.pdfBug = params.pdfBug === true;\n\n  const NativeImageDecoderValues = Object.values(NativeImageDecoding);\n  if (params.nativeImageDecoderSupport === undefined ||\n      !NativeImageDecoderValues.includes(params.nativeImageDecoderSupport)) {\n    params.nativeImageDecoderSupport =\n      (apiCompatibilityParams.nativeImageDecoderSupport ||\n       NativeImageDecoding.DECODE);\n  }\n  if (!Number.isInteger(params.maxImageSize)) {\n    params.maxImageSize = -1;\n  }\n  if (typeof params.isEvalSupported !== 'boolean') {\n    params.isEvalSupported = true;\n  }\n  if (typeof params.disableFontFace !== 'boolean') {\n    params.disableFontFace = apiCompatibilityParams.disableFontFace || false;\n  }\n\n  if (typeof params.disableRange !== 'boolean') {\n    params.disableRange = false;\n  }\n  if (typeof params.disableStream !== 'boolean') {\n    params.disableStream = false;\n  }\n  if (typeof params.disableAutoFetch !== 'boolean') {\n    params.disableAutoFetch = false;\n  }\n  if (typeof params.disableCreateObjectURL !== 'boolean') {\n    params.disableCreateObjectURL =\n      apiCompatibilityParams.disableCreateObjectURL || false;\n  }\n\n  // Set the main-thread verbosity level.\n  setVerbosityLevel(params.verbosity);\n\n  if (!worker) {\n    const workerParams = {\n      postMessageTransfers: params.postMessageTransfers,\n      verbosity: params.verbosity,\n      port: GlobalWorkerOptions.workerPort,\n    };\n    // Worker was not provided -- creating and owning our own. If message port\n    // is specified in global worker options, using it.\n    worker = workerParams.port ? PDFWorker.fromPort(workerParams) :\n                                 new PDFWorker(workerParams);\n    task._worker = worker;\n  }\n  const docId = task.docId;\n  worker.promise.then(function() {\n    if (task.destroyed) {\n      throw new Error('Loading aborted');\n    }\n    return _fetchDocument(worker, params, rangeTransport, docId).then(\n        function(workerId) {\n      if (task.destroyed) {\n        throw new Error('Loading aborted');\n      }\n\n      let networkStream;\n      if (rangeTransport) {\n        networkStream = new PDFDataTransportStream({\n          length: params.length,\n          initialData: params.initialData,\n          disableRange: params.disableRange,\n          disableStream: params.disableStream,\n        }, rangeTransport);\n      } else if (!params.data) {\n        networkStream = createPDFNetworkStream({\n          url: params.url,\n          length: params.length,\n          httpHeaders: params.httpHeaders,\n          withCredentials: params.withCredentials,\n          rangeChunkSize: params.rangeChunkSize,\n          disableRange: params.disableRange,\n          disableStream: params.disableStream,\n        });\n      }\n\n      const messageHandler = new MessageHandler(docId, workerId, worker.port);\n      messageHandler.postMessageTransfers = worker.postMessageTransfers;\n      const transport = new WorkerTransport(messageHandler, task, networkStream,\n                                            params);\n      task._transport = transport;\n      messageHandler.send('Ready', null);\n    });\n  }).catch(task._capability.reject);\n\n  return task;\n}\n\n/**\n * Starts fetching of specified PDF document/data.\n * @param {PDFWorker} worker\n * @param {Object} source\n * @param {PDFDataRangeTransport} pdfDataRangeTransport\n * @param {string} docId Unique document id, used as MessageHandler id.\n * @returns {Promise} The promise, which is resolved when worker id of\n *                    MessageHandler is known.\n * @private\n */\nfunction _fetchDocument(worker, source, pdfDataRangeTransport, docId) {\n  if (worker.destroyed) {\n    return Promise.reject(new Error('Worker was destroyed'));\n  }\n\n  if (pdfDataRangeTransport) {\n    source.length = pdfDataRangeTransport.length;\n    source.initialData = pdfDataRangeTransport.initialData;\n  }\n  return worker.messageHandler.sendWithPromise('GetDocRequest', {\n    docId,\n    apiVersion: (typeof PDFJSDev !== 'undefined' ?\n                 PDFJSDev.eval('BUNDLE_VERSION') : null),\n    source: { // Only send the required properties, and *not* the entire object.\n      data: source.data,\n      url: source.url,\n      password: source.password,\n      disableAutoFetch: source.disableAutoFetch,\n      rangeChunkSize: source.rangeChunkSize,\n      length: source.length,\n    },\n    maxImageSize: source.maxImageSize,\n    disableFontFace: source.disableFontFace,\n    disableCreateObjectURL: source.disableCreateObjectURL,\n    postMessageTransfers: worker.postMessageTransfers,\n    docBaseUrl: source.docBaseUrl,\n    nativeImageDecoderSupport: source.nativeImageDecoderSupport,\n    ignoreErrors: source.ignoreErrors,\n    isEvalSupported: source.isEvalSupported,\n  }).then(function(workerId) {\n    if (worker.destroyed) {\n      throw new Error('Worker was destroyed');\n    }\n    return workerId;\n  });\n}\n\n/**\n * PDF document loading operation.\n * @class\n * @alias PDFDocumentLoadingTask\n */\nconst PDFDocumentLoadingTask = (function PDFDocumentLoadingTaskClosure() {\n  let nextDocumentId = 0;\n\n  /** @constructs PDFDocumentLoadingTask */\n  class PDFDocumentLoadingTask {\n    constructor() {\n      this._capability = createPromiseCapability();\n      this._transport = null;\n      this._worker = null;\n\n      /**\n       * Unique document loading task id -- used in MessageHandlers.\n       * @type {string}\n       */\n      this.docId = 'd' + (nextDocumentId++);\n\n      /**\n       * Shows if loading task is destroyed.\n       * @type {boolean}\n       */\n      this.destroyed = false;\n\n      /**\n       * Callback to request a password if wrong or no password was provided.\n       * The callback receives two parameters: function that needs to be called\n       * with new password and reason (see {PasswordResponses}).\n       */\n      this.onPassword = null;\n\n      /**\n       * Callback to be able to monitor the loading progress of the PDF file\n       * (necessary to implement e.g. a loading bar). The callback receives\n       * an {Object} with the properties: {number} loaded and {number} total.\n       */\n      this.onProgress = null;\n\n      /**\n       * Callback to when unsupported feature is used. The callback receives\n       * an {UNSUPPORTED_FEATURES} argument.\n       */\n      this.onUnsupportedFeature = null;\n    }\n\n    /**\n     * @return {Promise}\n     */\n    get promise() {\n      return this._capability.promise;\n    }\n\n    /**\n     * Aborts all network requests and destroys worker.\n     * @return {Promise} A promise that is resolved after destruction activity\n     *                   is completed.\n     */\n    destroy() {\n      this.destroyed = true;\n\n      const transportDestroyed = !this._transport ? Promise.resolve() :\n        this._transport.destroy();\n      return transportDestroyed.then(() => {\n        this._transport = null;\n        if (this._worker) {\n          this._worker.destroy();\n          this._worker = null;\n        }\n      });\n    }\n\n    /**\n     * Registers callbacks to indicate the document loading completion.\n     *\n     * @param {function} onFulfilled The callback for the loading completion.\n     * @param {function} onRejected The callback for the loading failure.\n     * @return {Promise} A promise that is resolved after the onFulfilled or\n     *                   onRejected callback.\n     */\n    then(onFulfilled, onRejected) {\n      deprecated('PDFDocumentLoadingTask.then method, ' +\n                 'use the `promise` getter instead.');\n      return this.promise.then.apply(this.promise, arguments);\n    }\n  }\n  return PDFDocumentLoadingTask;\n})();\n\n/**\n * Abstract class to support range requests file loading.\n * @param {number} length\n * @param {Uint8Array} initialData\n */\nclass PDFDataRangeTransport {\n  constructor(length, initialData) {\n    this.length = length;\n    this.initialData = initialData;\n\n    this._rangeListeners = [];\n    this._progressListeners = [];\n    this._progressiveReadListeners = [];\n    this._readyCapability = createPromiseCapability();\n  }\n\n  addRangeListener(listener) {\n    this._rangeListeners.push(listener);\n  }\n\n  addProgressListener(listener) {\n    this._progressListeners.push(listener);\n  }\n\n  addProgressiveReadListener(listener) {\n    this._progressiveReadListeners.push(listener);\n  }\n\n  onDataRange(begin, chunk) {\n    for (const listener of this._rangeListeners) {\n      listener(begin, chunk);\n    }\n  }\n\n  onDataProgress(loaded) {\n    this._readyCapability.promise.then(() => {\n      for (const listener of this._progressListeners) {\n        listener(loaded);\n      }\n    });\n  }\n\n  onDataProgressiveRead(chunk) {\n    this._readyCapability.promise.then(() => {\n      for (const listener of this._progressiveReadListeners) {\n        listener(chunk);\n      }\n    });\n  }\n\n  transportReady() {\n    this._readyCapability.resolve();\n  }\n\n  requestDataRange(begin, end) {\n    unreachable('Abstract method PDFDataRangeTransport.requestDataRange');\n  }\n\n  abort() {}\n}\n\n/**\n * Proxy to a PDFDocument in the worker thread. Also, contains commonly used\n * properties that can be read synchronously.\n */\nclass PDFDocumentProxy {\n  constructor(pdfInfo, transport, loadingTask) {\n    this.loadingTask = loadingTask;\n\n    this._pdfInfo = pdfInfo;\n    this._transport = transport;\n  }\n\n  /**\n   * @return {number} Total number of pages the PDF contains.\n   */\n  get numPages() {\n    return this._pdfInfo.numPages;\n  }\n\n  /**\n   * @return {string} A (not guaranteed to be) unique ID to identify a PDF.\n   */\n  get fingerprint() {\n    return this._pdfInfo.fingerprint;\n  }\n\n  /**\n   * @param {number} pageNumber - The page number to get. The first page is 1.\n   * @return {Promise} A promise that is resolved with a {@link PDFPageProxy}\n   *   object.\n   */\n  getPage(pageNumber) {\n    return this._transport.getPage(pageNumber);\n  }\n\n  /**\n   * @param {{num: number, gen: number}} ref - The page reference. Must have\n   *   the `num` and `gen` properties.\n   * @return {Promise} A promise that is resolved with the page index that is\n   *   associated with the reference.\n   */\n  getPageIndex(ref) {\n    return this._transport.getPageIndex(ref);\n  }\n\n  /**\n   * @return {Promise} A promise that is resolved with a lookup table for\n   *   mapping named destinations to reference numbers.\n   *\n   * This can be slow for large documents. Use `getDestination` instead.\n   */\n  getDestinations() {\n    return this._transport.getDestinations();\n  }\n\n  /**\n   * @param {string} id - The named destination to get.\n   * @return {Promise} A promise that is resolved with all information\n   *   of the given named destination.\n   */\n  getDestination(id) {\n    return this._transport.getDestination(id);\n  }\n\n  /**\n   * @return {Promise} A promise that is resolved with an {Array} containing\n   *   the page labels that correspond to the page indexes, or `null` when\n   *   no page labels are present in the PDF file.\n   */\n  getPageLabels() {\n    return this._transport.getPageLabels();\n  }\n\n  /**\n   * @return {Promise} A promise that is resolved with a {string} containing\n   *   the page mode name.\n   */\n  getPageMode() {\n    return this._transport.getPageMode();\n  }\n\n  /**\n   * @return {Promise} A promise that is resolved with an {Array} containing the\n   *   destination, or `null` when no open action is present in the PDF file.\n   */\n  getOpenActionDestination() {\n    return this._transport.getOpenActionDestination();\n  }\n\n  /**\n   * @return {Promise} A promise that is resolved with a lookup table for\n   *   mapping named attachments to their content.\n   */\n  getAttachments() {\n    return this._transport.getAttachments();\n  }\n\n  /**\n   * @return {Promise} A promise that is resolved with an {Array} of all the\n   *   JavaScript strings in the name tree, or `null` if no JavaScript exists.\n   */\n  getJavaScript() {\n    return this._transport.getJavaScript();\n  }\n\n  /**\n   * @return {Promise} A promise that is resolved with an {Array} that is a\n   * tree outline (if it has one) of the PDF. The tree is in the format of:\n   * [\n   *   {\n   *     title: string,\n   *     bold: boolean,\n   *     italic: boolean,\n   *     color: rgb Uint8ClampedArray,\n   *     dest: dest obj,\n   *     url: string,\n   *     items: array of more items like this\n   *   },\n   *   ...\n   * ]\n   */\n  getOutline() {\n    return this._transport.getOutline();\n  }\n\n  /**\n   * @return {Promise} A promise that is resolved with an {Array} that contains\n   *   the permission flags for the PDF document, or `null` when\n   *   no permissions are present in the PDF file.\n   */\n  getPermissions() {\n    return this._transport.getPermissions();\n  }\n\n  /**\n   * @return {Promise} A promise that is resolved with an {Object} that has\n   *   `info` and `metadata` properties. `info` is an {Object} filled with\n   *   anything available in the information dictionary and similarly\n   *   `metadata` is a {Metadata} object with information from the metadata\n   *   section of the PDF.\n   */\n  getMetadata() {\n    return this._transport.getMetadata();\n  }\n\n  /**\n   * @return {Promise} A promise that is resolved with a {TypedArray} that has\n   * the raw data from the PDF.\n   */\n  getData() {\n    return this._transport.getData();\n  }\n\n  /**\n   * @return {Promise} A promise that is resolved when the document's data\n   *   is loaded. It is resolved with an {Object} that contains the `length`\n   *   property that indicates size of the PDF data in bytes.\n   */\n  getDownloadInfo() {\n    return this._transport.downloadInfoCapability.promise;\n  }\n\n  /**\n   * @return {Promise} A promise this is resolved with current statistics about\n   *   document structures (see {@link PDFDocumentStats}).\n   */\n  getStats() {\n    return this._transport.getStats();\n  }\n\n  /**\n   * Cleans up resources allocated by the document, e.g. created `@font-face`.\n   */\n  cleanup() {\n    this._transport.startCleanup();\n  }\n\n  /**\n   * Destroys the current document instance and terminates the worker.\n   */\n  destroy() {\n    return this.loadingTask.destroy();\n  }\n\n  /**\n   * @return {Object} A subset of the current {DocumentInitParameters},\n   *   which are either needed in the viewer and/or whose default values\n   *   may be affected by the `apiCompatibilityParams`.\n   */\n  get loadingParams() {\n    return this._transport.loadingParams;\n  }\n}\n\n/**\n * Page getViewport parameters.\n *\n * @typedef {Object} GetViewportParameters\n * @property {number} scale - The desired scale of the viewport.\n * @property {number} rotation - (optional) The desired rotation, in degrees, of\n *   the viewport. If omitted it defaults to the page rotation.\n * @property {boolean} dontFlip - (optional) If true, the y-axis will not be\n *   flipped. The default value is `false`.\n */\n\n/**\n * Page getTextContent parameters.\n *\n * @typedef {Object} getTextContentParameters\n * @property {boolean} normalizeWhitespace - replaces all occurrences of\n *   whitespace with standard spaces (0x20). The default value is `false`.\n * @property {boolean} disableCombineTextItems - do not attempt to combine\n *   same line {@link TextItem}'s. The default value is `false`.\n */\n\n/**\n * Page text content.\n *\n * @typedef {Object} TextContent\n * @property {array} items - array of {@link TextItem}\n * @property {Object} styles - {@link TextStyles} objects, indexed by font name.\n */\n\n/**\n * Page text content part.\n *\n * @typedef {Object} TextItem\n * @property {string} str - text content.\n * @property {string} dir - text direction: 'ttb', 'ltr' or 'rtl'.\n * @property {array} transform - transformation matrix.\n * @property {number} width - width in device space.\n * @property {number} height - height in device space.\n * @property {string} fontName - font name used by pdf.js for converted font.\n */\n\n/**\n * Text style.\n *\n * @typedef {Object} TextStyle\n * @property {number} ascent - font ascent.\n * @property {number} descent - font descent.\n * @property {boolean} vertical - text is in vertical mode.\n * @property {string} fontFamily - possible font family\n */\n\n/**\n * Page annotation parameters.\n *\n * @typedef {Object} GetAnnotationsParameters\n * @property {string} intent - Determines the annotations that will be fetched,\n *                    can be either 'display' (viewable annotations) or 'print'\n *                    (printable annotations).\n *                    If the parameter is omitted, all annotations are fetched.\n */\n\n/**\n * Page render parameters.\n *\n * @typedef {Object} RenderParameters\n * @property {Object} canvasContext - A 2D context of a DOM Canvas object.\n * @property {PageViewport} viewport - Rendering viewport obtained by\n *                          calling the `PDFPageProxy.getViewport` method.\n * @property {string} intent - Rendering intent, can be 'display' or 'print'\n *                    (default value is 'display').\n * @property {boolean} enableWebGL - (optional) Enables WebGL accelerated\n *   rendering for some operations. The default value is `false`.\n * @property {boolean} renderInteractiveForms - (optional) Whether or not\n *                     interactive form elements are rendered in the display\n *                     layer. If so, we do not render them on canvas as well.\n * @property {Array}  transform - (optional) Additional transform, applied\n *                    just before viewport transform.\n * @property {Object} imageLayer - (optional) An object that has beginLayout,\n *                    endLayout and appendImage functions.\n * @property {Object} canvasFactory - (optional) The factory that will be used\n *                    when creating canvases. The default value is\n *                    {DOMCanvasFactory}.\n * @property {Object} background - (optional) Background to use for the canvas.\n *                    Can use any valid canvas.fillStyle: A DOMString parsed as\n *                    CSS <color> value, a CanvasGradient object (a linear or\n *                    radial gradient) or a CanvasPattern object (a repetitive\n *                    image). The default value is 'rgb(255,255,255)'.\n */\n\n/**\n * PDF page operator list.\n *\n * @typedef {Object} PDFOperatorList\n * @property {Array} fnArray - Array containing the operator functions.\n * @property {Array} argsArray - Array containing the arguments of the\n *                               functions.\n */\n\n/**\n * Proxy to a PDFPage in the worker thread.\n * @alias PDFPageProxy\n */\nclass PDFPageProxy {\n  constructor(pageIndex, pageInfo, transport, pdfBug = false) {\n    this.pageIndex = pageIndex;\n    this._pageInfo = pageInfo;\n    this._transport = transport;\n    this._stats = (pdfBug ? new StatTimer() : DummyStatTimer);\n    this._pdfBug = pdfBug;\n    this.commonObjs = transport.commonObjs;\n    this.objs = new PDFObjects();\n\n    this.cleanupAfterRender = false;\n    this.pendingCleanup = false;\n    this.intentStates = Object.create(null);\n    this.destroyed = false;\n  }\n\n  /**\n   * @return {number} Page number of the page. First page is 1.\n   */\n  get pageNumber() {\n    return this.pageIndex + 1;\n  }\n\n  /**\n   * @return {number} The number of degrees the page is rotated clockwise.\n   */\n  get rotate() {\n    return this._pageInfo.rotate;\n  }\n\n  /**\n   * @return {Object} The reference that points to this page. It has 'num' and\n   * 'gen' properties.\n   */\n  get ref() {\n    return this._pageInfo.ref;\n  }\n\n  /**\n   * @return {number} The default size of units in 1/72nds of an inch.\n   */\n  get userUnit() {\n    return this._pageInfo.userUnit;\n  }\n\n  /**\n   * @return {Array} An array of the visible portion of the PDF page in the\n   * user space units - [x1, y1, x2, y2].\n   */\n  get view() {\n    return this._pageInfo.view;\n  }\n\n  /**\n   * @param {GetViewportParameters} params - Viewport parameters.\n   * @return {PageViewport} Contains 'width' and 'height' properties\n   *   along with transforms required for rendering.\n   */\n  getViewport({ scale, rotation = this.rotate, dontFlip = false, } = {}) {\n    if ((typeof PDFJSDev !== 'undefined' && PDFJSDev.test('GENERIC')) &&\n        (arguments.length > 1 || typeof arguments[0] === 'number')) {\n      deprecated('getViewport is called with obsolete arguments.');\n      scale = arguments[0];\n      rotation = typeof arguments[1] === 'number' ? arguments[1] : this.rotate;\n      dontFlip = typeof arguments[2] === 'boolean' ? arguments[2] : false;\n    }\n    return new PageViewport({\n      viewBox: this.view,\n      scale,\n      rotation,\n      dontFlip,\n    });\n  }\n\n  /**\n   * @param {GetAnnotationsParameters} params - Annotation parameters.\n   * @return {Promise} A promise that is resolved with an {Array} of the\n   * annotation objects.\n   */\n  getAnnotations({ intent = null, } = {}) {\n    if (!this.annotationsPromise || this.annotationsIntent !== intent) {\n      this.annotationsPromise = this._transport.getAnnotations(this.pageIndex,\n                                                               intent);\n      this.annotationsIntent = intent;\n    }\n    return this.annotationsPromise;\n  }\n\n  /**\n   * Begins the process of rendering a page to the desired context.\n   * @param {RenderParameters} params Page render parameters.\n   * @return {RenderTask} An object that contains the promise, which\n   *                      is resolved when the page finishes rendering.\n   */\n  render({ canvasContext, viewport, intent = 'display', enableWebGL = false,\n           renderInteractiveForms = false, transform = null, imageLayer = null,\n           canvasFactory = null, background = null, }) {\n    const stats = this._stats;\n    stats.time('Overall');\n\n    // If there was a pending destroy cancel it so no cleanup happens during\n    // this call to render.\n    this.pendingCleanup = false;\n\n    const renderingIntent = (intent === 'print' ? 'print' : 'display');\n    const canvasFactoryInstance = canvasFactory || new DOMCanvasFactory();\n    const webGLContext = new WebGLContext({\n      enable: enableWebGL,\n    });\n\n    if (!this.intentStates[renderingIntent]) {\n      this.intentStates[renderingIntent] = Object.create(null);\n    }\n    const intentState = this.intentStates[renderingIntent];\n\n    // If there's no displayReadyCapability yet, then the operatorList\n    // was never requested before. Make the request and create the promise.\n    if (!intentState.displayReadyCapability) {\n      intentState.receivingOperatorList = true;\n      intentState.displayReadyCapability = createPromiseCapability();\n      intentState.operatorList = {\n        fnArray: [],\n        argsArray: [],\n        lastChunk: false,\n      };\n\n      stats.time('Page Request');\n      this._transport.messageHandler.send('RenderPageRequest', {\n        pageIndex: this.pageNumber - 1,\n        intent: renderingIntent,\n        renderInteractiveForms: renderInteractiveForms === true,\n      });\n    }\n\n    const complete = (error) => {\n      const i = intentState.renderTasks.indexOf(internalRenderTask);\n      if (i >= 0) {\n        intentState.renderTasks.splice(i, 1);\n      }\n\n      if (this.cleanupAfterRender) {\n        this.pendingCleanup = true;\n      }\n      this._tryCleanup();\n\n      if (error) {\n        internalRenderTask.capability.reject(error);\n      } else {\n        internalRenderTask.capability.resolve();\n      }\n      stats.timeEnd('Rendering');\n      stats.timeEnd('Overall');\n    };\n\n    const internalRenderTask = new InternalRenderTask({\n      callback: complete,\n      params: { // Include the required properties, and *not* the entire object.\n        canvasContext,\n        viewport,\n        transform,\n        imageLayer,\n        background,\n      },\n      objs: this.objs,\n      commonObjs: this.commonObjs,\n      operatorList: intentState.operatorList,\n      pageNumber: this.pageNumber,\n      canvasFactory: canvasFactoryInstance,\n      webGLContext,\n      useRequestAnimationFrame: renderingIntent !== 'print',\n      pdfBug: this._pdfBug,\n    });\n\n    if (!intentState.renderTasks) {\n      intentState.renderTasks = [];\n    }\n    intentState.renderTasks.push(internalRenderTask);\n    const renderTask = internalRenderTask.task;\n\n    intentState.displayReadyCapability.promise.then((transparency) => {\n      if (this.pendingCleanup) {\n        complete();\n        return;\n      }\n      stats.time('Rendering');\n      internalRenderTask.initializeGraphics(transparency);\n      internalRenderTask.operatorListChanged();\n    }).catch(complete);\n\n    return renderTask;\n  }\n\n  /**\n   * @return {Promise} A promise resolved with an {@link PDFOperatorList}\n   *   object that represents page's operator list.\n   */\n  getOperatorList() {\n    function operatorListChanged() {\n      if (intentState.operatorList.lastChunk) {\n        intentState.opListReadCapability.resolve(intentState.operatorList);\n\n        const i = intentState.renderTasks.indexOf(opListTask);\n        if (i >= 0) {\n          intentState.renderTasks.splice(i, 1);\n        }\n      }\n    }\n\n    const renderingIntent = 'oplist';\n    if (!this.intentStates[renderingIntent]) {\n      this.intentStates[renderingIntent] = Object.create(null);\n    }\n    const intentState = this.intentStates[renderingIntent];\n    let opListTask;\n\n    if (!intentState.opListReadCapability) {\n      opListTask = {};\n      opListTask.operatorListChanged = operatorListChanged;\n      intentState.receivingOperatorList = true;\n      intentState.opListReadCapability = createPromiseCapability();\n      intentState.renderTasks = [];\n      intentState.renderTasks.push(opListTask);\n      intentState.operatorList = {\n        fnArray: [],\n        argsArray: [],\n        lastChunk: false,\n      };\n\n      this._stats.time('Page Request');\n      this._transport.messageHandler.send('RenderPageRequest', {\n        pageIndex: this.pageIndex,\n        intent: renderingIntent,\n      });\n    }\n    return intentState.opListReadCapability.promise;\n  }\n\n  /**\n   * @param {getTextContentParameters} params - getTextContent parameters.\n   * @return {ReadableStream} ReadableStream to read textContent chunks.\n   */\n  streamTextContent({ normalizeWhitespace = false,\n                      disableCombineTextItems = false, } = {}) {\n    const TEXT_CONTENT_CHUNK_SIZE = 100;\n\n    return this._transport.messageHandler.sendWithStream('GetTextContent', {\n      pageIndex: this.pageNumber - 1,\n      normalizeWhitespace: normalizeWhitespace === true,\n      combineTextItems: disableCombineTextItems !== true,\n    }, {\n      highWaterMark: TEXT_CONTENT_CHUNK_SIZE,\n      size(textContent) {\n        return textContent.items.length;\n      },\n    });\n  }\n\n  /**\n   * @param {getTextContentParameters} params - getTextContent parameters.\n   * @return {Promise} That is resolved a {@link TextContent}\n   * object that represent the page text content.\n   */\n  getTextContent(params = {}) {\n    const readableStream = this.streamTextContent(params);\n\n    return new Promise(function(resolve, reject) {\n      function pump() {\n        reader.read().then(function({ value, done, }) {\n          if (done) {\n            resolve(textContent);\n            return;\n          }\n          Object.assign(textContent.styles, value.styles);\n          textContent.items.push(...value.items);\n          pump();\n        }, reject);\n      }\n\n      const reader = readableStream.getReader();\n      const textContent = {\n        items: [],\n        styles: Object.create(null),\n      };\n      pump();\n    });\n  }\n\n  /**\n   * Destroys page object.\n   */\n  _destroy() {\n    this.destroyed = true;\n    this._transport.pageCache[this.pageIndex] = null;\n\n    const waitOn = [];\n    Object.keys(this.intentStates).forEach(function(intent) {\n      if (intent === 'oplist') {\n        // Avoid errors below, since the renderTasks are just stubs.\n        return;\n      }\n      const intentState = this.intentStates[intent];\n      intentState.renderTasks.forEach(function(renderTask) {\n        const renderCompleted = renderTask.capability.promise.\n          catch(function() {}); // ignoring failures\n        waitOn.push(renderCompleted);\n        renderTask.cancel();\n      });\n    }, this);\n    this.objs.clear();\n    this.annotationsPromise = null;\n    this.pendingCleanup = false;\n    return Promise.all(waitOn);\n  }\n\n  /**\n   * Cleans up resources allocated by the page.\n   * @param {boolean} resetStats - (optional) Reset page stats, if enabled.\n   *   The default value is `false`.\n   */\n  cleanup(resetStats = false) {\n    this.pendingCleanup = true;\n    this._tryCleanup(resetStats);\n  }\n\n  /**\n   * For internal use only. Attempts to clean up if rendering is in a state\n   * where that's possible.\n   * @ignore\n   */\n  _tryCleanup(resetStats = false) {\n    if (!this.pendingCleanup ||\n        Object.keys(this.intentStates).some(function(intent) {\n          const intentState = this.intentStates[intent];\n          return (intentState.renderTasks.length !== 0 ||\n                  intentState.receivingOperatorList);\n        }, this)) {\n      return;\n    }\n\n    Object.keys(this.intentStates).forEach(function(intent) {\n      delete this.intentStates[intent];\n    }, this);\n    this.objs.clear();\n    this.annotationsPromise = null;\n    if (resetStats && this._stats instanceof StatTimer) {\n      this._stats = new StatTimer();\n    }\n    this.pendingCleanup = false;\n  }\n\n  /**\n   * For internal use only.\n   * @ignore\n   */\n  _startRenderPage(transparency, intent) {\n    const intentState = this.intentStates[intent];\n    // TODO Refactor RenderPageRequest to separate rendering\n    // and operator list logic\n    if (intentState.displayReadyCapability) {\n      intentState.displayReadyCapability.resolve(transparency);\n    }\n  }\n\n  /**\n   * For internal use only.\n   * @ignore\n   */\n  _renderPageChunk(operatorListChunk, intent) {\n    const intentState = this.intentStates[intent];\n    // Add the new chunk to the current operator list.\n    for (let i = 0, ii = operatorListChunk.length; i < ii; i++) {\n      intentState.operatorList.fnArray.push(operatorListChunk.fnArray[i]);\n      intentState.operatorList.argsArray.push(\n        operatorListChunk.argsArray[i]);\n    }\n    intentState.operatorList.lastChunk = operatorListChunk.lastChunk;\n\n    // Notify all the rendering tasks there are more operators to be consumed.\n    for (let i = 0; i < intentState.renderTasks.length; i++) {\n      intentState.renderTasks[i].operatorListChanged();\n    }\n\n    if (operatorListChunk.lastChunk) {\n      intentState.receivingOperatorList = false;\n      this._tryCleanup();\n    }\n  }\n\n  /**\n   * @return {Object} Returns page stats, if enabled.\n   */\n  get stats() {\n    return (this._stats instanceof StatTimer ? this._stats : null);\n  }\n}\n\nclass LoopbackPort {\n  constructor(defer = true) {\n    this._listeners = [];\n    this._defer = defer;\n    this._deferred = Promise.resolve(undefined);\n  }\n\n  postMessage(obj, transfers) {\n    function cloneValue(value) {\n      // Trying to perform a structured clone close to the spec, including\n      // transfers.\n      if (typeof value !== 'object' || value === null) {\n        return value;\n      }\n      if (cloned.has(value)) { // already cloned the object\n        return cloned.get(value);\n      }\n      let buffer, result;\n      if ((buffer = value.buffer) && isArrayBuffer(buffer)) {\n        // We found object with ArrayBuffer (typed array).\n        const transferable = transfers && transfers.includes(buffer);\n        if (value === buffer) {\n          // Special case when we are faking typed arrays in compatibility.js.\n          result = value;\n        } else if (transferable) {\n          result = new value.constructor(buffer, value.byteOffset,\n                                         value.byteLength);\n        } else {\n          result = new value.constructor(value);\n        }\n        cloned.set(value, result);\n        return result;\n      }\n      result = Array.isArray(value) ? [] : {};\n      cloned.set(value, result); // adding to cache now for cyclic references\n      // Cloning all value and object properties, however ignoring properties\n      // defined via getter.\n      for (const i in value) {\n        let desc, p = value;\n        while (!(desc = Object.getOwnPropertyDescriptor(p, i))) {\n          p = Object.getPrototypeOf(p);\n        }\n        if (typeof desc.value === 'undefined' ||\n            typeof desc.value === 'function') {\n          continue;\n        }\n        result[i] = cloneValue(desc.value);\n      }\n      return result;\n    }\n\n    if (!this._defer) {\n      this._listeners.forEach(function(listener) {\n        listener.call(this, { data: obj, });\n      }, this);\n      return;\n    }\n\n    const cloned = new WeakMap();\n    const e = { data: cloneValue(obj), };\n    this._deferred.then(() => {\n      this._listeners.forEach(function(listener) {\n        listener.call(this, e);\n      }, this);\n    });\n  }\n\n  addEventListener(name, listener) {\n    this._listeners.push(listener);\n  }\n\n  removeEventListener(name, listener) {\n    const i = this._listeners.indexOf(listener);\n    this._listeners.splice(i, 1);\n  }\n\n  terminate() {\n    this._listeners = [];\n  }\n}\n\n/**\n * @typedef {Object} PDFWorkerParameters\n * @property {string} name - (optional) The name of the worker.\n * @property {Object} port - (optional) The `workerPort`.\n * @property {boolean} postMessageTransfers - (optional) Enables transfer usage\n *   in postMessage for ArrayBuffers. The default value is `true`.\n * @property {number} verbosity - (optional) Controls the logging level; the\n *   constants from {VerbosityLevel} should be used.\n */\n\n/**\n * PDF.js web worker abstraction, it controls instantiation of PDF documents and\n * WorkerTransport for them. If creation of a web worker is not possible,\n * a \"fake\" worker will be used instead.\n * @class\n */\nconst PDFWorker = (function PDFWorkerClosure() {\n  const pdfWorkerPorts = new WeakMap();\n  let nextFakeWorkerId = 0;\n  let fakeWorkerFilesLoadedCapability;\n\n  function getWorkerSrc() {\n    if (GlobalWorkerOptions.workerSrc) {\n      return GlobalWorkerOptions.workerSrc;\n    }\n    if (typeof fallbackWorkerSrc !== 'undefined') {\n      return fallbackWorkerSrc;\n    }\n    throw new Error('No \"GlobalWorkerOptions.workerSrc\" specified.');\n  }\n\n  function getMainThreadWorkerMessageHandler() {\n    try {\n      if (typeof window !== 'undefined') {\n        return (window.pdfjsWorker && window.pdfjsWorker.WorkerMessageHandler);\n      }\n    } catch (ex) { }\n    return null;\n  }\n\n  // Loads worker code into main thread.\n  function setupFakeWorkerGlobal() {\n    if (fakeWorkerFilesLoadedCapability) {\n      return fakeWorkerFilesLoadedCapability.promise;\n    }\n    fakeWorkerFilesLoadedCapability = createPromiseCapability();\n\n    const mainWorkerMessageHandler = getMainThreadWorkerMessageHandler();\n    if (mainWorkerMessageHandler) {\n      // The worker was already loaded using a `<script>` tag.\n      fakeWorkerFilesLoadedCapability.resolve(mainWorkerMessageHandler);\n      return fakeWorkerFilesLoadedCapability.promise;\n    }\n    // In the developer build load worker_loader.js which in turn loads all the\n    // other files and resolves the promise. In production only the\n    // pdf.worker.js file is needed.\n    if (typeof PDFJSDev === 'undefined' || !PDFJSDev.test('PRODUCTION')) {\n      if (typeof SystemJS === 'object') {\n        SystemJS.import('pdfjs/core/worker').then((worker) => {\n          fakeWorkerFilesLoadedCapability.resolve(worker.WorkerMessageHandler);\n        }).catch(fakeWorkerFilesLoadedCapability.reject);\n      } else if (typeof require === 'function') {\n        try {\n          const worker = require('../core/worker.js');\n          fakeWorkerFilesLoadedCapability.resolve(worker.WorkerMessageHandler);\n        } catch (ex) {\n          fakeWorkerFilesLoadedCapability.reject(ex);\n        }\n      } else {\n        fakeWorkerFilesLoadedCapability.reject(new Error(\n          'SystemJS or CommonJS must be used to load fake worker.'));\n      }\n    } else {\n      const loader = fakeWorkerFilesLoader || function() {\n        return loadScript(getWorkerSrc()).then(function() {\n          return window.pdfjsWorker.WorkerMessageHandler;\n        });\n      };\n      loader().then(fakeWorkerFilesLoadedCapability.resolve,\n                    fakeWorkerFilesLoadedCapability.reject);\n    }\n    return fakeWorkerFilesLoadedCapability.promise;\n  }\n\n  function createCDNWrapper(url) {\n    // We will rely on blob URL's property to specify origin.\n    // We want this function to fail in case if createObjectURL or Blob do not\n    // exist or fail for some reason -- our Worker creation will fail anyway.\n    const wrapper = 'importScripts(\\'' + url + '\\');';\n    return URL.createObjectURL(new Blob([wrapper]));\n  }\n\n  /**\n   * @param {PDFWorkerParameters} params - The worker initialization parameters.\n   */\n  class PDFWorker {\n    constructor({ name = null, port = null, postMessageTransfers = true,\n                  verbosity = getVerbosityLevel(), } = {}) {\n      if (port && pdfWorkerPorts.has(port)) {\n        throw new Error('Cannot use more than one PDFWorker per port');\n      }\n\n      this.name = name;\n      this.destroyed = false;\n      this.postMessageTransfers = postMessageTransfers !== false;\n      this.verbosity = verbosity;\n\n      this._readyCapability = createPromiseCapability();\n      this._port = null;\n      this._webWorker = null;\n      this._messageHandler = null;\n\n      if (port) {\n        pdfWorkerPorts.set(port, this);\n        this._initializeFromPort(port);\n        return;\n      }\n      this._initialize();\n    }\n\n    get promise() {\n      return this._readyCapability.promise;\n    }\n\n    get port() {\n      return this._port;\n    }\n\n    get messageHandler() {\n      return this._messageHandler;\n    }\n\n    _initializeFromPort(port) {\n      this._port = port;\n      this._messageHandler = new MessageHandler('main', 'worker', port);\n      this._messageHandler.on('ready', function() {\n        // Ignoring 'ready' event -- MessageHandler shall be already initialized\n        // and ready to accept the messages.\n      });\n      this._readyCapability.resolve();\n    }\n\n    _initialize() {\n      // If worker support isn't disabled explicit and the browser has worker\n      // support, create a new web worker and test if it/the browser fulfills\n      // all requirements to run parts of pdf.js in a web worker.\n      // Right now, the requirement is, that an Uint8Array is still an\n      // Uint8Array as it arrives on the worker. (Chrome added this with v.15.)\n      if (typeof Worker !== 'undefined' && !isWorkerDisabled &&\n          !getMainThreadWorkerMessageHandler()) {\n        let workerSrc = getWorkerSrc();\n\n        try {\n          // Wraps workerSrc path into blob URL, if the former does not belong\n          // to the same origin.\n          if (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('GENERIC') &&\n              !isSameOrigin(window.location.href, workerSrc)) {\n            workerSrc = createCDNWrapper(\n              new URL(workerSrc, window.location).href);\n          }\n\n          // Some versions of FF can't create a worker on localhost, see:\n          // https://bugzilla.mozilla.org/show_bug.cgi?id=683280\n          const worker = new Worker(workerSrc);\n          const messageHandler = new MessageHandler('main', 'worker', worker);\n          const terminateEarly = () => {\n            worker.removeEventListener('error', onWorkerError);\n            messageHandler.destroy();\n            worker.terminate();\n            if (this.destroyed) {\n              this._readyCapability.reject(new Error('Worker was destroyed'));\n            } else {\n              // Fall back to fake worker if the termination is caused by an\n              // error (e.g. NetworkError / SecurityError).\n              this._setupFakeWorker();\n            }\n          };\n\n          const onWorkerError = () => {\n            if (!this._webWorker) {\n              // Worker failed to initialize due to an error. Clean up and fall\n              // back to the fake worker.\n              terminateEarly();\n            }\n          };\n          worker.addEventListener('error', onWorkerError);\n\n          messageHandler.on('test', (data) => {\n            worker.removeEventListener('error', onWorkerError);\n            if (this.destroyed) {\n              terminateEarly();\n              return; // worker was destroyed\n            }\n            if (data && data.supportTypedArray) {\n              this._messageHandler = messageHandler;\n              this._port = worker;\n              this._webWorker = worker;\n              if (!data.supportTransfers) {\n                this.postMessageTransfers = false;\n              }\n              this._readyCapability.resolve();\n              // Send global setting, e.g. verbosity level.\n              messageHandler.send('configure', {\n                verbosity: this.verbosity,\n              });\n            } else {\n              this._setupFakeWorker();\n              messageHandler.destroy();\n              worker.terminate();\n            }\n          });\n\n          messageHandler.on('ready', (data) => {\n            worker.removeEventListener('error', onWorkerError);\n            if (this.destroyed) {\n              terminateEarly();\n              return; // worker was destroyed\n            }\n            try {\n              sendTest();\n            } catch (e) {\n              // We need fallback to a faked worker.\n              this._setupFakeWorker();\n            }\n          });\n\n          const sendTest = () => {\n            let testObj = new Uint8Array([this.postMessageTransfers ? 255 : 0]);\n            // Some versions of Opera throw a DATA_CLONE_ERR on serializing the\n            // typed array. Also, checking if we can use transfers.\n            try {\n              messageHandler.send('test', testObj, [testObj.buffer]);\n            } catch (ex) {\n              info('Cannot use postMessage transfers');\n              testObj[0] = 0;\n              messageHandler.send('test', testObj);\n            }\n          };\n\n          // It might take time for worker to initialize (especially when AMD\n          // loader is used). We will try to send test immediately, and then\n          // when 'ready' message will arrive. The worker shall process only\n          // first received 'test'.\n          sendTest();\n          return;\n        } catch (e) {\n          info('The worker has been disabled.');\n        }\n      }\n      // Either workers are disabled, not supported or have thrown an exception.\n      // Thus, we fallback to a faked worker.\n      this._setupFakeWorker();\n    }\n\n    _setupFakeWorker() {\n      if (!isWorkerDisabled) {\n        warn('Setting up fake worker.');\n        isWorkerDisabled = true;\n      }\n\n      setupFakeWorkerGlobal().then((WorkerMessageHandler) => {\n        if (this.destroyed) {\n          this._readyCapability.reject(new Error('Worker was destroyed'));\n          return;\n        }\n        const port = new LoopbackPort();\n        this._port = port;\n\n        // All fake workers use the same port, making id unique.\n        const id = 'fake' + (nextFakeWorkerId++);\n\n        // If the main thread is our worker, setup the handling for the\n        // messages -- the main thread sends to it self.\n        const workerHandler = new MessageHandler(id + '_worker', id, port);\n        WorkerMessageHandler.setup(workerHandler, port);\n\n        const messageHandler = new MessageHandler(id, id + '_worker', port);\n        this._messageHandler = messageHandler;\n        this._readyCapability.resolve();\n      }).catch((reason) => {\n        this._readyCapability.reject(\n          new Error(`Setting up fake worker failed: \"${reason.message}\".`));\n      });\n    }\n\n    /**\n     * Destroys the worker instance.\n     */\n    destroy() {\n      this.destroyed = true;\n      if (this._webWorker) {\n        // We need to terminate only web worker created resource.\n        this._webWorker.terminate();\n        this._webWorker = null;\n      }\n      pdfWorkerPorts.delete(this._port);\n      this._port = null;\n      if (this._messageHandler) {\n        this._messageHandler.destroy();\n        this._messageHandler = null;\n      }\n    }\n\n    /**\n     * @param {PDFWorkerParameters} params - The worker initialization\n     *                                       parameters.\n     */\n    static fromPort(params) {\n      if (!params || !params.port) {\n        throw new Error('PDFWorker.fromPort - invalid method signature.');\n      }\n      if (pdfWorkerPorts.has(params.port)) {\n        return pdfWorkerPorts.get(params.port);\n      }\n      return new PDFWorker(params);\n    }\n\n    static getWorkerSrc() {\n      return getWorkerSrc();\n    }\n  }\n  return PDFWorker;\n})();\n\n/**\n * For internal use only.\n * @ignore\n */\nclass WorkerTransport {\n  constructor(messageHandler, loadingTask, networkStream, params) {\n    this.messageHandler = messageHandler;\n    this.loadingTask = loadingTask;\n    this.commonObjs = new PDFObjects();\n    this.fontLoader = new FontLoader({\n      docId: loadingTask.docId,\n      onUnsupportedFeature: this._onUnsupportedFeature.bind(this),\n    });\n    this._params = params;\n    this.CMapReaderFactory = new params.CMapReaderFactory({\n      baseUrl: params.cMapUrl,\n      isCompressed: params.cMapPacked,\n    });\n\n    this.destroyed = false;\n    this.destroyCapability = null;\n    this._passwordCapability = null;\n\n    this._networkStream = networkStream;\n    this._fullReader = null;\n    this._lastProgress = null;\n\n    this.pageCache = [];\n    this.pagePromises = [];\n    this.downloadInfoCapability = createPromiseCapability();\n\n    this.setupMessageHandler();\n  }\n\n  destroy() {\n    if (this.destroyCapability) {\n      return this.destroyCapability.promise;\n    }\n\n    this.destroyed = true;\n    this.destroyCapability = createPromiseCapability();\n\n    if (this._passwordCapability) {\n      this._passwordCapability.reject(\n        new Error('Worker was destroyed during onPassword callback'));\n    }\n\n    const waitOn = [];\n    // We need to wait for all renderings to be completed, e.g.\n    // timeout/rAF can take a long time.\n    this.pageCache.forEach(function(page) {\n      if (page) {\n        waitOn.push(page._destroy());\n      }\n    });\n    this.pageCache = [];\n    this.pagePromises = [];\n    // We also need to wait for the worker to finish its long running tasks.\n    const terminated = this.messageHandler.sendWithPromise('Terminate', null);\n    waitOn.push(terminated);\n    Promise.all(waitOn).then(() => {\n      this.fontLoader.clear();\n      if (this._networkStream) {\n        this._networkStream.cancelAllRequests();\n      }\n\n      if (this.messageHandler) {\n        this.messageHandler.destroy();\n        this.messageHandler = null;\n      }\n      this.destroyCapability.resolve();\n    }, this.destroyCapability.reject);\n    return this.destroyCapability.promise;\n  }\n\n  setupMessageHandler() {\n    const { messageHandler, loadingTask, } = this;\n\n    messageHandler.on('GetReader', function(data, sink) {\n      assert(this._networkStream);\n      this._fullReader = this._networkStream.getFullReader();\n      this._fullReader.onProgress = (evt) => {\n        this._lastProgress = {\n          loaded: evt.loaded,\n          total: evt.total,\n        };\n      };\n      sink.onPull = () => {\n        this._fullReader.read().then(function({ value, done, }) {\n          if (done) {\n            sink.close();\n            return;\n          }\n          assert(isArrayBuffer(value));\n          // Enqueue data chunk into sink, and transfer it\n          // to other side as `Transferable` object.\n          sink.enqueue(new Uint8Array(value), 1, [value]);\n        }).catch((reason) => {\n          sink.error(reason);\n        });\n      };\n\n      sink.onCancel = (reason) => {\n        this._fullReader.cancel(reason);\n      };\n    }, this);\n\n    messageHandler.on('ReaderHeadersReady', function(data) {\n      const headersCapability = createPromiseCapability();\n      const fullReader = this._fullReader;\n      fullReader.headersReady.then(() => {\n        // If stream or range are disabled, it's our only way to report\n        // loading progress.\n        if (!fullReader.isStreamingSupported || !fullReader.isRangeSupported) {\n          if (this._lastProgress && loadingTask.onProgress) {\n            loadingTask.onProgress(this._lastProgress);\n          }\n          fullReader.onProgress = (evt) => {\n            if (loadingTask.onProgress) {\n              loadingTask.onProgress({\n                loaded: evt.loaded,\n                total: evt.total,\n              });\n            }\n          };\n        }\n\n        headersCapability.resolve({\n          isStreamingSupported: fullReader.isStreamingSupported,\n          isRangeSupported: fullReader.isRangeSupported,\n          contentLength: fullReader.contentLength,\n        });\n      }, headersCapability.reject);\n\n      return headersCapability.promise;\n    }, this);\n\n    messageHandler.on('GetRangeReader', function(data, sink) {\n      assert(this._networkStream);\n      const rangeReader =\n        this._networkStream.getRangeReader(data.begin, data.end);\n\n      sink.onPull = () => {\n        rangeReader.read().then(function({ value, done, }) {\n          if (done) {\n            sink.close();\n            return;\n          }\n          assert(isArrayBuffer(value));\n          sink.enqueue(new Uint8Array(value), 1, [value]);\n        }).catch((reason) => {\n          sink.error(reason);\n        });\n      };\n\n      sink.onCancel = (reason) => {\n        rangeReader.cancel(reason);\n      };\n    }, this);\n\n    messageHandler.on('GetDoc', function({ pdfInfo, }) {\n      this.numPages = pdfInfo.numPages;\n      this.pdfDocument = new PDFDocumentProxy(pdfInfo, this, loadingTask);\n      loadingTask._capability.resolve(this.pdfDocument);\n    }, this);\n\n    messageHandler.on('PasswordRequest', function(exception) {\n      this._passwordCapability = createPromiseCapability();\n\n      if (loadingTask.onPassword) {\n        const updatePassword = (password) => {\n          this._passwordCapability.resolve({\n            password,\n          });\n        };\n        try {\n          loadingTask.onPassword(updatePassword, exception.code);\n        } catch (ex) {\n          this._passwordCapability.reject(ex);\n        }\n      } else {\n        this._passwordCapability.reject(\n          new PasswordException(exception.message, exception.code));\n      }\n      return this._passwordCapability.promise;\n    }, this);\n\n    messageHandler.on('PasswordException', function(exception) {\n      loadingTask._capability.reject(\n        new PasswordException(exception.message, exception.code));\n    }, this);\n\n    messageHandler.on('InvalidPDF', function(exception) {\n      loadingTask._capability.reject(\n        new InvalidPDFException(exception.message));\n    }, this);\n\n    messageHandler.on('MissingPDF', function(exception) {\n      loadingTask._capability.reject(\n        new MissingPDFException(exception.message));\n    }, this);\n\n    messageHandler.on('UnexpectedResponse', function(exception) {\n      loadingTask._capability.reject(\n        new UnexpectedResponseException(exception.message, exception.status));\n    }, this);\n\n    messageHandler.on('UnknownError', function(exception) {\n      loadingTask._capability.reject(\n        new UnknownErrorException(exception.message, exception.details));\n    }, this);\n\n    messageHandler.on('DataLoaded', function(data) {\n      // For consistency: Ensure that progress is always reported when the\n      // entire PDF file has been loaded, regardless of how it was fetched.\n      if (loadingTask.onProgress) {\n        loadingTask.onProgress({\n          loaded: data.length,\n          total: data.length,\n        });\n      }\n      this.downloadInfoCapability.resolve(data);\n    }, this);\n\n    messageHandler.on('StartRenderPage', function(data) {\n      if (this.destroyed) {\n        return; // Ignore any pending requests if the worker was terminated.\n      }\n\n      const page = this.pageCache[data.pageIndex];\n      page._stats.timeEnd('Page Request');\n      page._startRenderPage(data.transparency, data.intent);\n    }, this);\n\n    messageHandler.on('RenderPageChunk', function(data) {\n      if (this.destroyed) {\n        return; // Ignore any pending requests if the worker was terminated.\n      }\n\n      const page = this.pageCache[data.pageIndex];\n      page._renderPageChunk(data.operatorList, data.intent);\n    }, this);\n\n    messageHandler.on('commonobj', function(data) {\n      if (this.destroyed) {\n        return; // Ignore any pending requests if the worker was terminated.\n      }\n\n      const [id, type, exportedData] = data;\n      if (this.commonObjs.has(id)) {\n        return;\n      }\n\n      switch (type) {\n        case 'Font':\n          const params = this._params;\n\n          if ('error' in exportedData) {\n            const exportedError = exportedData.error;\n            warn(`Error during font loading: ${exportedError}`);\n            this.commonObjs.resolve(id, exportedError);\n            break;\n          }\n\n          let fontRegistry = null;\n          if (params.pdfBug && globalScope.FontInspector &&\n              globalScope.FontInspector.enabled) {\n            fontRegistry = {\n              registerFont(font, url) {\n                globalScope['FontInspector'].fontAdded(font, url);\n              },\n            };\n          }\n          const font = new FontFaceObject(exportedData, {\n            isEvalSupported: params.isEvalSupported,\n            disableFontFace: params.disableFontFace,\n            ignoreErrors: params.ignoreErrors,\n            onUnsupportedFeature: this._onUnsupportedFeature.bind(this),\n            fontRegistry,\n          });\n\n          this.fontLoader.bind(font).then(() => {\n            this.commonObjs.resolve(id, font);\n          }, (reason) => {\n            messageHandler.sendWithPromise('FontFallback', {\n              id,\n            }).finally(() => {\n              this.commonObjs.resolve(id, font);\n            });\n          });\n          break;\n        case 'FontPath':\n          this.commonObjs.resolve(id, exportedData);\n          break;\n        default:\n          throw new Error(`Got unknown common object type ${type}`);\n      }\n    }, this);\n\n    messageHandler.on('obj', function(data) {\n      if (this.destroyed) {\n        return; // Ignore any pending requests if the worker was terminated.\n      }\n\n      const [id, pageIndex, type, imageData] = data;\n      const pageProxy = this.pageCache[pageIndex];\n      if (pageProxy.objs.has(id)) {\n        return;\n      }\n\n      switch (type) {\n        case 'JpegStream':\n          return new Promise((resolve, reject) => {\n            const img = new Image();\n            img.onload = function() {\n              resolve(img);\n            };\n            img.onerror = function() {\n              reject(new Error('Error during JPEG image loading'));\n              // Note that when the browser image loading/decoding fails,\n              // we'll fallback to the built-in PDF.js JPEG decoder; see\n              // `PartialEvaluator.buildPaintImageXObject` in the\n              // `src/core/evaluator.js` file.\n            };\n            img.src = imageData;\n          }).then((img) => {\n            pageProxy.objs.resolve(id, img);\n          });\n        case 'Image':\n          pageProxy.objs.resolve(id, imageData);\n\n          // Heuristic that will allow us not to store large data.\n          const MAX_IMAGE_SIZE_TO_STORE = 8000000;\n          if (imageData && 'data' in imageData &&\n              imageData.data.length > MAX_IMAGE_SIZE_TO_STORE) {\n            pageProxy.cleanupAfterRender = true;\n          }\n          break;\n        default:\n          throw new Error(`Got unknown object type ${type}`);\n      }\n    }, this);\n\n    messageHandler.on('DocProgress', function(data) {\n      if (this.destroyed) {\n        return; // Ignore any pending requests if the worker was terminated.\n      }\n\n      if (loadingTask.onProgress) {\n        loadingTask.onProgress({\n          loaded: data.loaded,\n          total: data.total,\n        });\n      }\n    }, this);\n\n    messageHandler.on('PageError', function(data) {\n      if (this.destroyed) {\n        return; // Ignore any pending requests if the worker was terminated.\n      }\n\n      const page = this.pageCache[data.pageNum - 1];\n      const intentState = page.intentStates[data.intent];\n\n      if (intentState.displayReadyCapability) {\n        intentState.displayReadyCapability.reject(data.error);\n      } else {\n        throw new Error(data.error);\n      }\n\n      if (intentState.operatorList) {\n        // Mark operator list as complete.\n        intentState.operatorList.lastChunk = true;\n        for (let i = 0; i < intentState.renderTasks.length; i++) {\n          intentState.renderTasks[i].operatorListChanged();\n        }\n      }\n    }, this);\n\n    messageHandler.on('UnsupportedFeature', this._onUnsupportedFeature, this);\n\n    messageHandler.on('JpegDecode', function(data) {\n      if (this.destroyed) {\n        return Promise.reject(new Error('Worker was destroyed'));\n      }\n\n      if (typeof document === 'undefined') {\n        // Make sure that this code is not executing in node.js, as\n        // it's using DOM image, and there is no library to support that.\n        return Promise.reject(new Error('\"document\" is not defined.'));\n      }\n\n      const [imageUrl, components] = data;\n      if (components !== 3 && components !== 1) {\n        return Promise.reject(\n          new Error('Only 3 components or 1 component can be returned'));\n      }\n\n      return new Promise(function(resolve, reject) {\n        const img = new Image();\n        img.onload = function() {\n          const width = img.width;\n          const height = img.height;\n          const size = width * height;\n          const rgbaLength = size * 4;\n          const buf = new Uint8ClampedArray(size * components);\n          const tmpCanvas = document.createElement('canvas');\n          tmpCanvas.width = width;\n          tmpCanvas.height = height;\n          const tmpCtx = tmpCanvas.getContext('2d');\n          tmpCtx.drawImage(img, 0, 0);\n          const data = tmpCtx.getImageData(0, 0, width, height).data;\n\n          if (components === 3) {\n            for (let i = 0, j = 0; i < rgbaLength; i += 4, j += 3) {\n              buf[j] = data[i];\n              buf[j + 1] = data[i + 1];\n              buf[j + 2] = data[i + 2];\n            }\n          } else if (components === 1) {\n            for (let i = 0, j = 0; i < rgbaLength; i += 4, j++) {\n              buf[j] = data[i];\n            }\n          }\n          resolve({ data: buf, width, height, });\n        };\n        img.onerror = function() {\n          reject(new Error('JpegDecode failed to load image'));\n        };\n        img.src = imageUrl;\n      });\n    }, this);\n\n    messageHandler.on('FetchBuiltInCMap', function(data) {\n      if (this.destroyed) {\n        return Promise.reject(new Error('Worker was destroyed'));\n      }\n      return this.CMapReaderFactory.fetch({\n        name: data.name,\n      });\n    }, this);\n  }\n\n  _onUnsupportedFeature({ featureId, }) {\n    if (this.destroyed) {\n      return; // Ignore any pending requests if the worker was terminated.\n    }\n    if (this.loadingTask.onUnsupportedFeature) {\n      this.loadingTask.onUnsupportedFeature(featureId);\n    }\n  }\n\n  getData() {\n    return this.messageHandler.sendWithPromise('GetData', null);\n  }\n\n  getPage(pageNumber) {\n    if (!Number.isInteger(pageNumber) ||\n        pageNumber <= 0 || pageNumber > this.numPages) {\n      return Promise.reject(new Error('Invalid page request'));\n    }\n\n    const pageIndex = pageNumber - 1;\n    if (pageIndex in this.pagePromises) {\n      return this.pagePromises[pageIndex];\n    }\n    const promise = this.messageHandler.sendWithPromise('GetPage', {\n      pageIndex,\n    }).then((pageInfo) => {\n      if (this.destroyed) {\n        throw new Error('Transport destroyed');\n      }\n      const page = new PDFPageProxy(pageIndex, pageInfo, this,\n                                    this._params.pdfBug);\n      this.pageCache[pageIndex] = page;\n      return page;\n    });\n    this.pagePromises[pageIndex] = promise;\n    return promise;\n  }\n\n  getPageIndex(ref) {\n    return this.messageHandler.sendWithPromise('GetPageIndex', {\n      ref,\n    }).catch(function(reason) {\n      return Promise.reject(new Error(reason));\n    });\n  }\n\n  getAnnotations(pageIndex, intent) {\n    return this.messageHandler.sendWithPromise('GetAnnotations', {\n      pageIndex,\n      intent,\n    });\n  }\n\n  getDestinations() {\n    return this.messageHandler.sendWithPromise('GetDestinations', null);\n  }\n\n  getDestination(id) {\n    if (typeof id !== 'string') {\n      return Promise.reject(new Error('Invalid destination request.'));\n    }\n    return this.messageHandler.sendWithPromise('GetDestination', {\n      id,\n    });\n  }\n\n  getPageLabels() {\n    return this.messageHandler.sendWithPromise('GetPageLabels', null);\n  }\n\n  getPageMode() {\n    return this.messageHandler.sendWithPromise('GetPageMode', null);\n  }\n\n  getOpenActionDestination() {\n    return this.messageHandler.sendWithPromise('getOpenActionDestination',\n                                               null);\n  }\n\n  getAttachments() {\n    return this.messageHandler.sendWithPromise('GetAttachments', null);\n  }\n\n  getJavaScript() {\n    return this.messageHandler.sendWithPromise('GetJavaScript', null);\n  }\n\n  getOutline() {\n    return this.messageHandler.sendWithPromise('GetOutline', null);\n  }\n\n  getPermissions() {\n    return this.messageHandler.sendWithPromise('GetPermissions', null);\n  }\n\n  getMetadata() {\n    return this.messageHandler.sendWithPromise('GetMetadata', null).\n        then((results) => {\n      return {\n        info: results[0],\n        metadata: (results[1] ? new Metadata(results[1]) : null),\n        contentDispositionFilename: (this._fullReader ?\n                                     this._fullReader.filename : null),\n      };\n    });\n  }\n\n  getStats() {\n    return this.messageHandler.sendWithPromise('GetStats', null);\n  }\n\n  startCleanup() {\n    this.messageHandler.sendWithPromise('Cleanup', null).then(() => {\n      for (let i = 0, ii = this.pageCache.length; i < ii; i++) {\n        const page = this.pageCache[i];\n        if (page) {\n          page.cleanup();\n        }\n      }\n      this.commonObjs.clear();\n      this.fontLoader.clear();\n    });\n  }\n\n  get loadingParams() {\n    const params = this._params;\n    return shadow(this, 'loadingParams', {\n      disableAutoFetch: params.disableAutoFetch,\n      disableCreateObjectURL: params.disableCreateObjectURL,\n      disableFontFace: params.disableFontFace,\n      nativeImageDecoderSupport: params.nativeImageDecoderSupport,\n    });\n  }\n}\n\n/**\n * A PDF document and page is built of many objects. E.g. there are objects for\n * fonts, images, rendering code, etc. These objects may get processed inside of\n * a worker. This class implements some basic methods to manage these objects.\n * @ignore\n */\nclass PDFObjects {\n  constructor() {\n    this._objs = Object.create(null);\n  }\n\n  /**\n   * Ensures there is an object defined for `objId`.\n   * @private\n   */\n  _ensureObj(objId) {\n    if (this._objs[objId]) {\n      return this._objs[objId];\n    }\n    return this._objs[objId] = {\n      capability: createPromiseCapability(),\n      data: null,\n      resolved: false,\n    };\n  }\n\n  /**\n   * If called *without* callback, this returns the data of `objId` but the\n   * object needs to be resolved. If it isn't, this method throws.\n   *\n   * If called *with* a callback, the callback is called with the data of the\n   * object once the object is resolved. That means, if you call this method\n   * and the object is already resolved, the callback gets called right away.\n   */\n  get(objId, callback = null) {\n    // If there is a callback, then the get can be async and the object is\n    // not required to be resolved right now.\n    if (callback) {\n      this._ensureObj(objId).capability.promise.then(callback);\n      return null;\n    }\n    // If there isn't a callback, the user expects to get the resolved data\n    // directly.\n    const obj = this._objs[objId];\n    // If there isn't an object yet or the object isn't resolved, then the\n    // data isn't ready yet!\n    if (!obj || !obj.resolved) {\n      throw new Error(`Requesting object that isn't resolved yet ${objId}.`);\n    }\n    return obj.data;\n  }\n\n  has(objId) {\n    const obj = this._objs[objId];\n    return (obj ? obj.resolved : false);\n  }\n\n  /**\n   * Resolves the object `objId` with optional `data`.\n   */\n  resolve(objId, data) {\n    const obj = this._ensureObj(objId);\n\n    obj.resolved = true;\n    obj.data = data;\n    obj.capability.resolve(data);\n  }\n\n  clear() {\n    this._objs = Object.create(null);\n  }\n}\n\n/**\n * Allows controlling of the rendering tasks.\n * @alias RenderTask\n */\nclass RenderTask {\n  constructor(internalRenderTask) {\n    this._internalRenderTask = internalRenderTask;\n\n    /**\n     * Callback for incremental rendering -- a function that will be called\n     * each time the rendering is paused.  To continue rendering call the\n     * function that is the first argument to the callback.\n     * @type {function}\n     */\n    this.onContinue = null;\n  }\n\n  /**\n   * Promise for rendering task completion.\n   * @return {Promise}\n   */\n  get promise() {\n    return this._internalRenderTask.capability.promise;\n  }\n\n  /**\n   * Cancels the rendering task. If the task is currently rendering it will\n   * not be cancelled until graphics pauses with a timeout. The promise that\n   * this object extends will be rejected when cancelled.\n   */\n  cancel() {\n    this._internalRenderTask.cancel();\n  }\n\n  /**\n   * Registers callbacks to indicate the rendering task completion.\n   *\n   * @param {function} onFulfilled The callback for the rendering completion.\n   * @param {function} onRejected The callback for the rendering failure.\n   * @return {Promise} A promise that is resolved after the onFulfilled or\n   *                   onRejected callback.\n   */\n  then(onFulfilled, onRejected) {\n    deprecated('RenderTask.then method, use the `promise` getter instead.');\n    return this.promise.then.apply(this.promise, arguments);\n  }\n}\n\n/**\n * For internal use only.\n * @ignore\n */\nconst InternalRenderTask = (function InternalRenderTaskClosure() {\n  const canvasInRendering = new WeakSet();\n\n  class InternalRenderTask {\n    constructor({ callback, params, objs, commonObjs, operatorList, pageNumber,\n                  canvasFactory, webGLContext, useRequestAnimationFrame = false,\n                  pdfBug = false, }) {\n      this.callback = callback;\n      this.params = params;\n      this.objs = objs;\n      this.commonObjs = commonObjs;\n      this.operatorListIdx = null;\n      this.operatorList = operatorList;\n      this.pageNumber = pageNumber;\n      this.canvasFactory = canvasFactory;\n      this.webGLContext = webGLContext;\n      this._pdfBug = pdfBug;\n\n      this.running = false;\n      this.graphicsReadyCallback = null;\n      this.graphicsReady = false;\n      this._useRequestAnimationFrame = (useRequestAnimationFrame === true &&\n                                        typeof window !== 'undefined');\n      this.cancelled = false;\n      this.capability = createPromiseCapability();\n      this.task = new RenderTask(this);\n      // caching this-bound methods\n      this._continueBound = this._continue.bind(this);\n      this._scheduleNextBound = this._scheduleNext.bind(this);\n      this._nextBound = this._next.bind(this);\n      this._canvas = params.canvasContext.canvas;\n    }\n\n    initializeGraphics(transparency = false) {\n      if (this.cancelled) {\n        return;\n      }\n      if (this._canvas) {\n        if (canvasInRendering.has(this._canvas)) {\n          throw new Error(\n            'Cannot use the same canvas during multiple render() operations. ' +\n            'Use different canvas or ensure previous operations were ' +\n            'cancelled or completed.');\n        }\n        canvasInRendering.add(this._canvas);\n      }\n\n      if (this._pdfBug && globalScope.StepperManager &&\n          globalScope.StepperManager.enabled) {\n        this.stepper = globalScope.StepperManager.create(this.pageNumber - 1);\n        this.stepper.init(this.operatorList);\n        this.stepper.nextBreakPoint = this.stepper.getNextBreakPoint();\n      }\n      const {\n        canvasContext, viewport, transform, imageLayer, background,\n      } = this.params;\n\n      this.gfx = new CanvasGraphics(canvasContext, this.commonObjs, this.objs,\n                                    this.canvasFactory, this.webGLContext,\n                                    imageLayer);\n      this.gfx.beginDrawing({\n        transform,\n        viewport,\n        transparency,\n        background,\n      });\n      this.operatorListIdx = 0;\n      this.graphicsReady = true;\n      if (this.graphicsReadyCallback) {\n        this.graphicsReadyCallback();\n      }\n    }\n\n    cancel(error = null) {\n      this.running = false;\n      this.cancelled = true;\n      if (this.gfx) {\n        this.gfx.endDrawing();\n      }\n      if (this._canvas) {\n        canvasInRendering.delete(this._canvas);\n      }\n      this.callback(error || new RenderingCancelledException(\n        `Rendering cancelled, page ${this.pageNumber}`, 'canvas'));\n    }\n\n    operatorListChanged() {\n      if (!this.graphicsReady) {\n        if (!this.graphicsReadyCallback) {\n          this.graphicsReadyCallback = this._continueBound;\n        }\n        return;\n      }\n\n      if (this.stepper) {\n        this.stepper.updateOperatorList(this.operatorList);\n      }\n\n      if (this.running) {\n        return;\n      }\n      this._continue();\n    }\n\n    _continue() {\n      this.running = true;\n      if (this.cancelled) {\n        return;\n      }\n      if (this.task.onContinue) {\n        this.task.onContinue(this._scheduleNextBound);\n      } else {\n        this._scheduleNext();\n      }\n    }\n\n    _scheduleNext() {\n      if (this._useRequestAnimationFrame) {\n        window.requestAnimationFrame(() => {\n          this._nextBound().catch(this.cancel.bind(this));\n        });\n      } else {\n        Promise.resolve().then(this._nextBound).catch(this.cancel.bind(this));\n      }\n    }\n\n    async _next() {\n      if (this.cancelled) {\n        return;\n      }\n      this.operatorListIdx = this.gfx.executeOperatorList(this.operatorList,\n                                                          this.operatorListIdx,\n                                                          this._continueBound,\n                                                          this.stepper);\n      if (this.operatorListIdx === this.operatorList.argsArray.length) {\n        this.running = false;\n        if (this.operatorList.lastChunk) {\n          this.gfx.endDrawing();\n          if (this._canvas) {\n            canvasInRendering.delete(this._canvas);\n          }\n          this.callback();\n        }\n      }\n    }\n  }\n  return InternalRenderTask;\n})();\n\nconst version = (typeof PDFJSDev !== 'undefined' ?\n                 PDFJSDev.eval('BUNDLE_VERSION') : null);\nconst build = (typeof PDFJSDev !== 'undefined' ?\n               PDFJSDev.eval('BUNDLE_BUILD') : null);\n\nexport {\n  getDocument,\n  LoopbackPort,\n  PDFDataRangeTransport,\n  PDFWorker,\n  PDFDocumentProxy,\n  PDFPageProxy,\n  setPDFNetworkStreamFactory,\n  version,\n  build,\n};\n","module.exports = require(\"regenerator-runtime\");\n","/**\n * Copyright (c) 2014-present, Facebook, Inc.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n */\n\n// This method of obtaining a reference to the global object needs to be\n// kept identical to the way it is obtained in runtime.js\nvar g = (function() {\n  return this || (typeof self === \"object\" && self);\n})() || Function(\"return this\")();\n\n// Use `getOwnPropertyNames` because not all browsers support calling\n// `hasOwnProperty` on the global `self` object in a worker. See #183.\nvar hadRuntime = g.regeneratorRuntime &&\n  Object.getOwnPropertyNames(g).indexOf(\"regeneratorRuntime\") >= 0;\n\n// Save the old regeneratorRuntime in case it needs to be restored later.\nvar oldRuntime = hadRuntime && g.regeneratorRuntime;\n\n// Force reevalutation of runtime.js.\ng.regeneratorRuntime = undefined;\n\nmodule.exports = require(\"./runtime\");\n\nif (hadRuntime) {\n  // Restore the original runtime.\n  g.regeneratorRuntime = oldRuntime;\n} else {\n  // Remove the global property added by runtime.js.\n  try {\n    delete g.regeneratorRuntime;\n  } catch(e) {\n    g.regeneratorRuntime = undefined;\n  }\n}\n","/**\n * Copyright (c) 2014-present, Facebook, Inc.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n */\n\n!(function(global) {\n  \"use strict\";\n\n  var Op = Object.prototype;\n  var hasOwn = Op.hasOwnProperty;\n  var undefined; // More compressible than void 0.\n  var $Symbol = typeof Symbol === \"function\" ? Symbol : {};\n  var iteratorSymbol = $Symbol.iterator || \"@@iterator\";\n  var asyncIteratorSymbol = $Symbol.asyncIterator || \"@@asyncIterator\";\n  var toStringTagSymbol = $Symbol.toStringTag || \"@@toStringTag\";\n\n  var inModule = typeof module === \"object\";\n  var runtime = global.regeneratorRuntime;\n  if (runtime) {\n    if (inModule) {\n      // If regeneratorRuntime is defined globally and we're in a module,\n      // make the exports object identical to regeneratorRuntime.\n      module.exports = runtime;\n    }\n    // Don't bother evaluating the rest of this file if the runtime was\n    // already defined globally.\n    return;\n  }\n\n  // Define the runtime globally (as expected by generated code) as either\n  // module.exports (if we're in a module) or a new, empty object.\n  runtime = global.regeneratorRuntime = inModule ? module.exports : {};\n\n  function wrap(innerFn, outerFn, self, tryLocsList) {\n    // If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator.\n    var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator;\n    var generator = Object.create(protoGenerator.prototype);\n    var context = new Context(tryLocsList || []);\n\n    // The ._invoke method unifies the implementations of the .next,\n    // .throw, and .return methods.\n    generator._invoke = makeInvokeMethod(innerFn, self, context);\n\n    return generator;\n  }\n  runtime.wrap = wrap;\n\n  // Try/catch helper to minimize deoptimizations. Returns a completion\n  // record like context.tryEntries[i].completion. This interface could\n  // have been (and was previously) designed to take a closure to be\n  // invoked without arguments, but in all the cases we care about we\n  // already have an existing method we want to call, so there's no need\n  // to create a new function object. We can even get away with assuming\n  // the method takes exactly one argument, since that happens to be true\n  // in every case, so we don't have to touch the arguments object. The\n  // only additional allocation required is the completion record, which\n  // has a stable shape and so hopefully should be cheap to allocate.\n  function tryCatch(fn, obj, arg) {\n    try {\n      return { type: \"normal\", arg: fn.call(obj, arg) };\n    } catch (err) {\n      return { type: \"throw\", arg: err };\n    }\n  }\n\n  var GenStateSuspendedStart = \"suspendedStart\";\n  var GenStateSuspendedYield = \"suspendedYield\";\n  var GenStateExecuting = \"executing\";\n  var GenStateCompleted = \"completed\";\n\n  // Returning this object from the innerFn has the same effect as\n  // breaking out of the dispatch switch statement.\n  var ContinueSentinel = {};\n\n  // Dummy constructor functions that we use as the .constructor and\n  // .constructor.prototype properties for functions that return Generator\n  // objects. For full spec compliance, you may wish to configure your\n  // minifier not to mangle the names of these two functions.\n  function Generator() {}\n  function GeneratorFunction() {}\n  function GeneratorFunctionPrototype() {}\n\n  // This is a polyfill for %IteratorPrototype% for environments that\n  // don't natively support it.\n  var IteratorPrototype = {};\n  IteratorPrototype[iteratorSymbol] = function () {\n    return this;\n  };\n\n  var getProto = Object.getPrototypeOf;\n  var NativeIteratorPrototype = getProto && getProto(getProto(values([])));\n  if (NativeIteratorPrototype &&\n      NativeIteratorPrototype !== Op &&\n      hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) {\n    // This environment has a native %IteratorPrototype%; use it instead\n    // of the polyfill.\n    IteratorPrototype = NativeIteratorPrototype;\n  }\n\n  var Gp = GeneratorFunctionPrototype.prototype =\n    Generator.prototype = Object.create(IteratorPrototype);\n  GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype;\n  GeneratorFunctionPrototype.constructor = GeneratorFunction;\n  GeneratorFunctionPrototype[toStringTagSymbol] =\n    GeneratorFunction.displayName = \"GeneratorFunction\";\n\n  // Helper for defining the .next, .throw, and .return methods of the\n  // Iterator interface in terms of a single ._invoke method.\n  function defineIteratorMethods(prototype) {\n    [\"next\", \"throw\", \"return\"].forEach(function(method) {\n      prototype[method] = function(arg) {\n        return this._invoke(method, arg);\n      };\n    });\n  }\n\n  runtime.isGeneratorFunction = function(genFun) {\n    var ctor = typeof genFun === \"function\" && genFun.constructor;\n    return ctor\n      ? ctor === GeneratorFunction ||\n        // For the native GeneratorFunction constructor, the best we can\n        // do is to check its .name property.\n        (ctor.displayName || ctor.name) === \"GeneratorFunction\"\n      : false;\n  };\n\n  runtime.mark = function(genFun) {\n    if (Object.setPrototypeOf) {\n      Object.setPrototypeOf(genFun, GeneratorFunctionPrototype);\n    } else {\n      genFun.__proto__ = GeneratorFunctionPrototype;\n      if (!(toStringTagSymbol in genFun)) {\n        genFun[toStringTagSymbol] = \"GeneratorFunction\";\n      }\n    }\n    genFun.prototype = Object.create(Gp);\n    return genFun;\n  };\n\n  // Within the body of any async function, `await x` is transformed to\n  // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test\n  // `hasOwn.call(value, \"__await\")` to determine if the yielded value is\n  // meant to be awaited.\n  runtime.awrap = function(arg) {\n    return { __await: arg };\n  };\n\n  function AsyncIterator(generator) {\n    function invoke(method, arg, resolve, reject) {\n      var record = tryCatch(generator[method], generator, arg);\n      if (record.type === \"throw\") {\n        reject(record.arg);\n      } else {\n        var result = record.arg;\n        var value = result.value;\n        if (value &&\n            typeof value === \"object\" &&\n            hasOwn.call(value, \"__await\")) {\n          return Promise.resolve(value.__await).then(function(value) {\n            invoke(\"next\", value, resolve, reject);\n          }, function(err) {\n            invoke(\"throw\", err, resolve, reject);\n          });\n        }\n\n        return Promise.resolve(value).then(function(unwrapped) {\n          // When a yielded Promise is resolved, its final value becomes\n          // the .value of the Promise<{value,done}> result for the\n          // current iteration.\n          result.value = unwrapped;\n          resolve(result);\n        }, function(error) {\n          // If a rejected Promise was yielded, throw the rejection back\n          // into the async generator function so it can be handled there.\n          return invoke(\"throw\", error, resolve, reject);\n        });\n      }\n    }\n\n    var previousPromise;\n\n    function enqueue(method, arg) {\n      function callInvokeWithMethodAndArg() {\n        return new Promise(function(resolve, reject) {\n          invoke(method, arg, resolve, reject);\n        });\n      }\n\n      return previousPromise =\n        // If enqueue has been called before, then we want to wait until\n        // all previous Promises have been resolved before calling invoke,\n        // so that results are always delivered in the correct order. If\n        // enqueue has not been called before, then it is important to\n        // call invoke immediately, without waiting on a callback to fire,\n        // so that the async generator function has the opportunity to do\n        // any necessary setup in a predictable way. This predictability\n        // is why the Promise constructor synchronously invokes its\n        // executor callback, and why async functions synchronously\n        // execute code before the first await. Since we implement simple\n        // async functions in terms of async generators, it is especially\n        // important to get this right, even though it requires care.\n        previousPromise ? previousPromise.then(\n          callInvokeWithMethodAndArg,\n          // Avoid propagating failures to Promises returned by later\n          // invocations of the iterator.\n          callInvokeWithMethodAndArg\n        ) : callInvokeWithMethodAndArg();\n    }\n\n    // Define the unified helper method that is used to implement .next,\n    // .throw, and .return (see defineIteratorMethods).\n    this._invoke = enqueue;\n  }\n\n  defineIteratorMethods(AsyncIterator.prototype);\n  AsyncIterator.prototype[asyncIteratorSymbol] = function () {\n    return this;\n  };\n  runtime.AsyncIterator = AsyncIterator;\n\n  // Note that simple async functions are implemented on top of\n  // AsyncIterator objects; they just return a Promise for the value of\n  // the final result produced by the iterator.\n  runtime.async = function(innerFn, outerFn, self, tryLocsList) {\n    var iter = new AsyncIterator(\n      wrap(innerFn, outerFn, self, tryLocsList)\n    );\n\n    return runtime.isGeneratorFunction(outerFn)\n      ? iter // If outerFn is a generator, return the full iterator.\n      : iter.next().then(function(result) {\n          return result.done ? result.value : iter.next();\n        });\n  };\n\n  function makeInvokeMethod(innerFn, self, context) {\n    var state = GenStateSuspendedStart;\n\n    return function invoke(method, arg) {\n      if (state === GenStateExecuting) {\n        throw new Error(\"Generator is already running\");\n      }\n\n      if (state === GenStateCompleted) {\n        if (method === \"throw\") {\n          throw arg;\n        }\n\n        // Be forgiving, per 25.3.3.3.3 of the spec:\n        // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume\n        return doneResult();\n      }\n\n      context.method = method;\n      context.arg = arg;\n\n      while (true) {\n        var delegate = context.delegate;\n        if (delegate) {\n          var delegateResult = maybeInvokeDelegate(delegate, context);\n          if (delegateResult) {\n            if (delegateResult === ContinueSentinel) continue;\n            return delegateResult;\n          }\n        }\n\n        if (context.method === \"next\") {\n          // Setting context._sent for legacy support of Babel's\n          // function.sent implementation.\n          context.sent = context._sent = context.arg;\n\n        } else if (context.method === \"throw\") {\n          if (state === GenStateSuspendedStart) {\n            state = GenStateCompleted;\n            throw context.arg;\n          }\n\n          context.dispatchException(context.arg);\n\n        } else if (context.method === \"return\") {\n          context.abrupt(\"return\", context.arg);\n        }\n\n        state = GenStateExecuting;\n\n        var record = tryCatch(innerFn, self, context);\n        if (record.type === \"normal\") {\n          // If an exception is thrown from innerFn, we leave state ===\n          // GenStateExecuting and loop back for another invocation.\n          state = context.done\n            ? GenStateCompleted\n            : GenStateSuspendedYield;\n\n          if (record.arg === ContinueSentinel) {\n            continue;\n          }\n\n          return {\n            value: record.arg,\n            done: context.done\n          };\n\n        } else if (record.type === \"throw\") {\n          state = GenStateCompleted;\n          // Dispatch the exception by looping back around to the\n          // context.dispatchException(context.arg) call above.\n          context.method = \"throw\";\n          context.arg = record.arg;\n        }\n      }\n    };\n  }\n\n  // Call delegate.iterator[context.method](context.arg) and handle the\n  // result, either by returning a { value, done } result from the\n  // delegate iterator, or by modifying context.method and context.arg,\n  // setting context.delegate to null, and returning the ContinueSentinel.\n  function maybeInvokeDelegate(delegate, context) {\n    var method = delegate.iterator[context.method];\n    if (method === undefined) {\n      // A .throw or .return when the delegate iterator has no .throw\n      // method always terminates the yield* loop.\n      context.delegate = null;\n\n      if (context.method === \"throw\") {\n        if (delegate.iterator.return) {\n          // If the delegate iterator has a return method, give it a\n          // chance to clean up.\n          context.method = \"return\";\n          context.arg = undefined;\n          maybeInvokeDelegate(delegate, context);\n\n          if (context.method === \"throw\") {\n            // If maybeInvokeDelegate(context) changed context.method from\n            // \"return\" to \"throw\", let that override the TypeError below.\n            return ContinueSentinel;\n          }\n        }\n\n        context.method = \"throw\";\n        context.arg = new TypeError(\n          \"The iterator does not provide a 'throw' method\");\n      }\n\n      return ContinueSentinel;\n    }\n\n    var record = tryCatch(method, delegate.iterator, context.arg);\n\n    if (record.type === \"throw\") {\n      context.method = \"throw\";\n      context.arg = record.arg;\n      context.delegate = null;\n      return ContinueSentinel;\n    }\n\n    var info = record.arg;\n\n    if (! info) {\n      context.method = \"throw\";\n      context.arg = new TypeError(\"iterator result is not an object\");\n      context.delegate = null;\n      return ContinueSentinel;\n    }\n\n    if (info.done) {\n      // Assign the result of the finished delegate to the temporary\n      // variable specified by delegate.resultName (see delegateYield).\n      context[delegate.resultName] = info.value;\n\n      // Resume execution at the desired location (see delegateYield).\n      context.next = delegate.nextLoc;\n\n      // If context.method was \"throw\" but the delegate handled the\n      // exception, let the outer generator proceed normally. If\n      // context.method was \"next\", forget context.arg since it has been\n      // \"consumed\" by the delegate iterator. If context.method was\n      // \"return\", allow the original .return call to continue in the\n      // outer generator.\n      if (context.method !== \"return\") {\n        context.method = \"next\";\n        context.arg = undefined;\n      }\n\n    } else {\n      // Re-yield the result returned by the delegate method.\n      return info;\n    }\n\n    // The delegate iterator is finished, so forget it and continue with\n    // the outer generator.\n    context.delegate = null;\n    return ContinueSentinel;\n  }\n\n  // Define Generator.prototype.{next,throw,return} in terms of the\n  // unified ._invoke helper method.\n  defineIteratorMethods(Gp);\n\n  Gp[toStringTagSymbol] = \"Generator\";\n\n  // A Generator should always return itself as the iterator object when the\n  // @@iterator function is called on it. Some browsers' implementations of the\n  // iterator prototype chain incorrectly implement this, causing the Generator\n  // object to not be returned from this call. This ensures that doesn't happen.\n  // See https://github.com/facebook/regenerator/issues/274 for more details.\n  Gp[iteratorSymbol] = function() {\n    return this;\n  };\n\n  Gp.toString = function() {\n    return \"[object Generator]\";\n  };\n\n  function pushTryEntry(locs) {\n    var entry = { tryLoc: locs[0] };\n\n    if (1 in locs) {\n      entry.catchLoc = locs[1];\n    }\n\n    if (2 in locs) {\n      entry.finallyLoc = locs[2];\n      entry.afterLoc = locs[3];\n    }\n\n    this.tryEntries.push(entry);\n  }\n\n  function resetTryEntry(entry) {\n    var record = entry.completion || {};\n    record.type = \"normal\";\n    delete record.arg;\n    entry.completion = record;\n  }\n\n  function Context(tryLocsList) {\n    // The root entry object (effectively a try statement without a catch\n    // or a finally block) gives us a place to store values thrown from\n    // locations where there is no enclosing try statement.\n    this.tryEntries = [{ tryLoc: \"root\" }];\n    tryLocsList.forEach(pushTryEntry, this);\n    this.reset(true);\n  }\n\n  runtime.keys = function(object) {\n    var keys = [];\n    for (var key in object) {\n      keys.push(key);\n    }\n    keys.reverse();\n\n    // Rather than returning an object with a next method, we keep\n    // things simple and return the next function itself.\n    return function next() {\n      while (keys.length) {\n        var key = keys.pop();\n        if (key in object) {\n          next.value = key;\n          next.done = false;\n          return next;\n        }\n      }\n\n      // To avoid creating an additional object, we just hang the .value\n      // and .done properties off the next function object itself. This\n      // also ensures that the minifier will not anonymize the function.\n      next.done = true;\n      return next;\n    };\n  };\n\n  function values(iterable) {\n    if (iterable) {\n      var iteratorMethod = iterable[iteratorSymbol];\n      if (iteratorMethod) {\n        return iteratorMethod.call(iterable);\n      }\n\n      if (typeof iterable.next === \"function\") {\n        return iterable;\n      }\n\n      if (!isNaN(iterable.length)) {\n        var i = -1, next = function next() {\n          while (++i < iterable.length) {\n            if (hasOwn.call(iterable, i)) {\n              next.value = iterable[i];\n              next.done = false;\n              return next;\n            }\n          }\n\n          next.value = undefined;\n          next.done = true;\n\n          return next;\n        };\n\n        return next.next = next;\n      }\n    }\n\n    // Return an iterator with no values.\n    return { next: doneResult };\n  }\n  runtime.values = values;\n\n  function doneResult() {\n    return { value: undefined, done: true };\n  }\n\n  Context.prototype = {\n    constructor: Context,\n\n    reset: function(skipTempReset) {\n      this.prev = 0;\n      this.next = 0;\n      // Resetting context._sent for legacy support of Babel's\n      // function.sent implementation.\n      this.sent = this._sent = undefined;\n      this.done = false;\n      this.delegate = null;\n\n      this.method = \"next\";\n      this.arg = undefined;\n\n      this.tryEntries.forEach(resetTryEntry);\n\n      if (!skipTempReset) {\n        for (var name in this) {\n          // Not sure about the optimal order of these conditions:\n          if (name.charAt(0) === \"t\" &&\n              hasOwn.call(this, name) &&\n              !isNaN(+name.slice(1))) {\n            this[name] = undefined;\n          }\n        }\n      }\n    },\n\n    stop: function() {\n      this.done = true;\n\n      var rootEntry = this.tryEntries[0];\n      var rootRecord = rootEntry.completion;\n      if (rootRecord.type === \"throw\") {\n        throw rootRecord.arg;\n      }\n\n      return this.rval;\n    },\n\n    dispatchException: function(exception) {\n      if (this.done) {\n        throw exception;\n      }\n\n      var context = this;\n      function handle(loc, caught) {\n        record.type = \"throw\";\n        record.arg = exception;\n        context.next = loc;\n\n        if (caught) {\n          // If the dispatched exception was caught by a catch block,\n          // then let that catch block handle the exception normally.\n          context.method = \"next\";\n          context.arg = undefined;\n        }\n\n        return !! caught;\n      }\n\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        var record = entry.completion;\n\n        if (entry.tryLoc === \"root\") {\n          // Exception thrown outside of any try block that could handle\n          // it, so set the completion value of the entire function to\n          // throw the exception.\n          return handle(\"end\");\n        }\n\n        if (entry.tryLoc <= this.prev) {\n          var hasCatch = hasOwn.call(entry, \"catchLoc\");\n          var hasFinally = hasOwn.call(entry, \"finallyLoc\");\n\n          if (hasCatch && hasFinally) {\n            if (this.prev < entry.catchLoc) {\n              return handle(entry.catchLoc, true);\n            } else if (this.prev < entry.finallyLoc) {\n              return handle(entry.finallyLoc);\n            }\n\n          } else if (hasCatch) {\n            if (this.prev < entry.catchLoc) {\n              return handle(entry.catchLoc, true);\n            }\n\n          } else if (hasFinally) {\n            if (this.prev < entry.finallyLoc) {\n              return handle(entry.finallyLoc);\n            }\n\n          } else {\n            throw new Error(\"try statement without catch or finally\");\n          }\n        }\n      }\n    },\n\n    abrupt: function(type, arg) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.tryLoc <= this.prev &&\n            hasOwn.call(entry, \"finallyLoc\") &&\n            this.prev < entry.finallyLoc) {\n          var finallyEntry = entry;\n          break;\n        }\n      }\n\n      if (finallyEntry &&\n          (type === \"break\" ||\n           type === \"continue\") &&\n          finallyEntry.tryLoc <= arg &&\n          arg <= finallyEntry.finallyLoc) {\n        // Ignore the finally entry if control is not jumping to a\n        // location outside the try/catch block.\n        finallyEntry = null;\n      }\n\n      var record = finallyEntry ? finallyEntry.completion : {};\n      record.type = type;\n      record.arg = arg;\n\n      if (finallyEntry) {\n        this.method = \"next\";\n        this.next = finallyEntry.finallyLoc;\n        return ContinueSentinel;\n      }\n\n      return this.complete(record);\n    },\n\n    complete: function(record, afterLoc) {\n      if (record.type === \"throw\") {\n        throw record.arg;\n      }\n\n      if (record.type === \"break\" ||\n          record.type === \"continue\") {\n        this.next = record.arg;\n      } else if (record.type === \"return\") {\n        this.rval = this.arg = record.arg;\n        this.method = \"return\";\n        this.next = \"end\";\n      } else if (record.type === \"normal\" && afterLoc) {\n        this.next = afterLoc;\n      }\n\n      return ContinueSentinel;\n    },\n\n    finish: function(finallyLoc) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.finallyLoc === finallyLoc) {\n          this.complete(entry.completion, entry.afterLoc);\n          resetTryEntry(entry);\n          return ContinueSentinel;\n        }\n      }\n    },\n\n    \"catch\": function(tryLoc) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.tryLoc === tryLoc) {\n          var record = entry.completion;\n          if (record.type === \"throw\") {\n            var thrown = record.arg;\n            resetTryEntry(entry);\n          }\n          return thrown;\n        }\n      }\n\n      // The context.catch method must only be called with a location\n      // argument that corresponds to a known catch block.\n      throw new Error(\"illegal catch attempt\");\n    },\n\n    delegateYield: function(iterable, resultName, nextLoc) {\n      this.delegate = {\n        iterator: values(iterable),\n        resultName: resultName,\n        nextLoc: nextLoc\n      };\n\n      if (this.method === \"next\") {\n        // Deliberately forget the last sent value so that we don't\n        // accidentally pass it on to the delegate.\n        this.arg = undefined;\n      }\n\n      return ContinueSentinel;\n    }\n  };\n})(\n  // In sloppy mode, unbound `this` refers to the global object, fallback to\n  // Function constructor if we're in global strict mode. That is sadly a form\n  // of indirect eval which violates Content Security Policy.\n  (function() {\n    return this || (typeof self === \"object\" && self);\n  })() || Function(\"return this\")()\n);\n","module.exports = function(module) {\r\n\tif (!module.webpackPolyfill) {\r\n\t\tmodule.deprecate = function() {};\r\n\t\tmodule.paths = [];\r\n\t\t// module.parent = undefined by default\r\n\t\tif (!module.children) module.children = [];\r\n\t\tObject.defineProperty(module, \"loaded\", {\r\n\t\t\tenumerable: true,\r\n\t\t\tget: function() {\r\n\t\t\t\treturn module.l;\r\n\t\t\t}\r\n\t\t});\r\n\t\tObject.defineProperty(module, \"id\", {\r\n\t\t\tenumerable: true,\r\n\t\t\tget: function() {\r\n\t\t\t\treturn module.i;\r\n\t\t\t}\r\n\t\t});\r\n\t\tmodule.webpackPolyfill = 1;\r\n\t}\r\n\treturn module;\r\n};\r\n","/* Copyright 2015 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport {\n  assert, CMapCompressionType, removeNullCharacters, stringToBytes,\n  unreachable, Util, warn\n} from '../shared/util';\n\nconst DEFAULT_LINK_REL = 'noopener noreferrer nofollow';\nconst SVG_NS = 'http://www.w3.org/2000/svg';\n\nclass DOMCanvasFactory {\n  create(width, height) {\n    if (width <= 0 || height <= 0) {\n      throw new Error('invalid canvas size');\n    }\n    let canvas = document.createElement('canvas');\n    let context = canvas.getContext('2d');\n    canvas.width = width;\n    canvas.height = height;\n    return {\n      canvas,\n      context,\n    };\n  }\n\n  reset(canvasAndContext, width, height) {\n    if (!canvasAndContext.canvas) {\n      throw new Error('canvas is not specified');\n    }\n    if (width <= 0 || height <= 0) {\n      throw new Error('invalid canvas size');\n    }\n    canvasAndContext.canvas.width = width;\n    canvasAndContext.canvas.height = height;\n  }\n\n  destroy(canvasAndContext) {\n    if (!canvasAndContext.canvas) {\n      throw new Error('canvas is not specified');\n    }\n    // Zeroing the width and height cause Firefox to release graphics\n    // resources immediately, which can greatly reduce memory consumption.\n    canvasAndContext.canvas.width = 0;\n    canvasAndContext.canvas.height = 0;\n    canvasAndContext.canvas = null;\n    canvasAndContext.context = null;\n  }\n}\n\nclass DOMCMapReaderFactory {\n  constructor({ baseUrl = null, isCompressed = false, }) {\n    this.baseUrl = baseUrl;\n    this.isCompressed = isCompressed;\n  }\n\n  fetch({ name, }) {\n    if (!this.baseUrl) {\n      return Promise.reject(new Error(\n        'The CMap \"baseUrl\" parameter must be specified, ensure that ' +\n        'the \"cMapUrl\" and \"cMapPacked\" API parameters are provided.'));\n    }\n    if (!name) {\n      return Promise.reject(new Error('CMap name must be specified.'));\n    }\n    return new Promise((resolve, reject) => {\n      let url = this.baseUrl + name + (this.isCompressed ? '.bcmap' : '');\n\n      let request = new XMLHttpRequest();\n      request.open('GET', url, true);\n\n      if (this.isCompressed) {\n        request.responseType = 'arraybuffer';\n      }\n      request.onreadystatechange = () => {\n        if (request.readyState !== XMLHttpRequest.DONE) {\n          return;\n        }\n        if (request.status === 200 || request.status === 0) {\n          let data;\n          if (this.isCompressed && request.response) {\n            data = new Uint8Array(request.response);\n          } else if (!this.isCompressed && request.responseText) {\n            data = stringToBytes(request.responseText);\n          }\n          if (data) {\n            resolve({\n              cMapData: data,\n              compressionType: this.isCompressed ?\n                CMapCompressionType.BINARY : CMapCompressionType.NONE,\n            });\n            return;\n          }\n        }\n        reject(new Error('Unable to load ' +\n                         (this.isCompressed ? 'binary ' : '') +\n                         'CMap at: ' + url));\n      };\n\n      request.send(null);\n    });\n  }\n}\n\nclass DOMSVGFactory {\n  create(width, height) {\n    assert(width > 0 && height > 0, 'Invalid SVG dimensions');\n\n    let svg = document.createElementNS(SVG_NS, 'svg:svg');\n    svg.setAttribute('version', '1.1');\n    svg.setAttribute('width', width + 'px');\n    svg.setAttribute('height', height + 'px');\n    svg.setAttribute('preserveAspectRatio', 'none');\n    svg.setAttribute('viewBox', '0 0 ' + width + ' ' + height);\n\n    return svg;\n  }\n\n  createElement(type) {\n    assert(typeof type === 'string', 'Invalid SVG element type');\n\n    return document.createElementNS(SVG_NS, type);\n  }\n}\n\n/**\n * @typedef {Object} PageViewportParameters\n * @property {Array} viewBox - The xMin, yMin, xMax and yMax coordinates.\n * @property {number} scale - The scale of the viewport.\n * @property {number} rotation - The rotation, in degrees, of the viewport.\n * @property {number} offsetX - (optional) The horizontal, i.e. x-axis, offset.\n *   The default value is `0`.\n * @property {number} offsetY - (optional) The vertical, i.e. y-axis, offset.\n *   The default value is `0`.\n * @property {boolean} dontFlip - (optional) If true, the y-axis will not be\n *   flipped. The default value is `false`.\n */\n\n/**\n * @typedef {Object} PageViewportCloneParameters\n * @property {number} scale - (optional) The scale, overriding the one in the\n *   cloned viewport. The default value is `this.scale`.\n * @property {number} rotation - (optional) The rotation, in degrees, overriding\n *   the one in the cloned viewport. The default value is `this.rotation`.\n * @property {boolean} dontFlip - (optional) If true, the x-axis will not be\n *   flipped. The default value is `false`.\n */\n\n/**\n * PDF page viewport created based on scale, rotation and offset.\n */\nclass PageViewport {\n  /**\n   * @param {PageViewportParameters}\n   */\n  constructor({ viewBox, scale, rotation, offsetX = 0, offsetY = 0,\n                dontFlip = false, }) {\n    this.viewBox = viewBox;\n    this.scale = scale;\n    this.rotation = rotation;\n    this.offsetX = offsetX;\n    this.offsetY = offsetY;\n\n    // creating transform to convert pdf coordinate system to the normal\n    // canvas like coordinates taking in account scale and rotation\n    let centerX = (viewBox[2] + viewBox[0]) / 2;\n    let centerY = (viewBox[3] + viewBox[1]) / 2;\n    let rotateA, rotateB, rotateC, rotateD;\n    rotation = rotation % 360;\n    rotation = rotation < 0 ? rotation + 360 : rotation;\n    switch (rotation) {\n      case 180:\n        rotateA = -1; rotateB = 0; rotateC = 0; rotateD = 1;\n        break;\n      case 90:\n        rotateA = 0; rotateB = 1; rotateC = 1; rotateD = 0;\n        break;\n      case 270:\n        rotateA = 0; rotateB = -1; rotateC = -1; rotateD = 0;\n        break;\n      // case 0:\n      default:\n        rotateA = 1; rotateB = 0; rotateC = 0; rotateD = -1;\n        break;\n    }\n\n    if (dontFlip) {\n      rotateC = -rotateC; rotateD = -rotateD;\n    }\n\n    let offsetCanvasX, offsetCanvasY;\n    let width, height;\n    if (rotateA === 0) {\n      offsetCanvasX = Math.abs(centerY - viewBox[1]) * scale + offsetX;\n      offsetCanvasY = Math.abs(centerX - viewBox[0]) * scale + offsetY;\n      width = Math.abs(viewBox[3] - viewBox[1]) * scale;\n      height = Math.abs(viewBox[2] - viewBox[0]) * scale;\n    } else {\n      offsetCanvasX = Math.abs(centerX - viewBox[0]) * scale + offsetX;\n      offsetCanvasY = Math.abs(centerY - viewBox[1]) * scale + offsetY;\n      width = Math.abs(viewBox[2] - viewBox[0]) * scale;\n      height = Math.abs(viewBox[3] - viewBox[1]) * scale;\n    }\n    // creating transform for the following operations:\n    // translate(-centerX, -centerY), rotate and flip vertically,\n    // scale, and translate(offsetCanvasX, offsetCanvasY)\n    this.transform = [\n      rotateA * scale,\n      rotateB * scale,\n      rotateC * scale,\n      rotateD * scale,\n      offsetCanvasX - rotateA * scale * centerX - rotateC * scale * centerY,\n      offsetCanvasY - rotateB * scale * centerX - rotateD * scale * centerY\n    ];\n\n    this.width = width;\n    this.height = height;\n  }\n\n  /**\n   * Clones viewport, with optional additional properties.\n   * @param {PageViewportCloneParameters} - (optional)\n   * @return {PageViewport} Cloned viewport.\n   */\n  clone({ scale = this.scale, rotation = this.rotation,\n          dontFlip = false, } = {}) {\n    return new PageViewport({\n      viewBox: this.viewBox.slice(),\n      scale,\n      rotation,\n      offsetX: this.offsetX,\n      offsetY: this.offsetY,\n      dontFlip,\n    });\n  }\n\n  /**\n   * Converts PDF point to the viewport coordinates. For examples, useful for\n   * converting PDF location into canvas pixel coordinates.\n   * @param {number} x - The x-coordinate.\n   * @param {number} y - The y-coordinate.\n   * @return {Object} Object containing `x` and `y` properties of the\n   *   point in the viewport coordinate space.\n   * @see {@link convertToPdfPoint}\n   * @see {@link convertToViewportRectangle}\n   */\n  convertToViewportPoint(x, y) {\n    return Util.applyTransform([x, y], this.transform);\n  }\n\n  /**\n   * Converts PDF rectangle to the viewport coordinates.\n   * @param {Array} rect - The xMin, yMin, xMax and yMax coordinates.\n   * @return {Array} Array containing corresponding coordinates of the rectangle\n   *   in the viewport coordinate space.\n   * @see {@link convertToViewportPoint}\n   */\n  convertToViewportRectangle(rect) {\n    let tl = Util.applyTransform([rect[0], rect[1]], this.transform);\n    let br = Util.applyTransform([rect[2], rect[3]], this.transform);\n    return [tl[0], tl[1], br[0], br[1]];\n  }\n\n  /**\n   * Converts viewport coordinates to the PDF location. For examples, useful\n   * for converting canvas pixel location into PDF one.\n   * @param {number} x - The x-coordinate.\n   * @param {number} y - The y-coordinate.\n   * @return {Object} Object containing `x` and `y` properties of the\n   *   point in the PDF coordinate space.\n   * @see {@link convertToViewportPoint}\n   */\n  convertToPdfPoint(x, y) {\n    return Util.applyInverseTransform([x, y], this.transform);\n  }\n}\n\nvar RenderingCancelledException = (function RenderingCancelledException() {\n  function RenderingCancelledException(msg, type) {\n    this.message = msg;\n    this.type = type;\n  }\n\n  RenderingCancelledException.prototype = new Error();\n  RenderingCancelledException.prototype.name = 'RenderingCancelledException';\n  RenderingCancelledException.constructor = RenderingCancelledException;\n\n  return RenderingCancelledException;\n})();\n\nconst LinkTarget = {\n  NONE: 0, // Default value.\n  SELF: 1,\n  BLANK: 2,\n  PARENT: 3,\n  TOP: 4,\n};\n\nconst LinkTargetStringMap = [\n  '',\n  '_self',\n  '_blank',\n  '_parent',\n  '_top'\n];\n\n/**\n * @typedef ExternalLinkParameters\n * @typedef {Object} ExternalLinkParameters\n * @property {string} url - An absolute URL.\n * @property {LinkTarget} target - (optional) The link target.\n *   The default value is `LinkTarget.NONE`.\n * @property {string} rel - (optional) The link relationship.\n *   The default value is `DEFAULT_LINK_REL`.\n */\n\n/**\n * Adds various attributes (href, title, target, rel) to hyperlinks.\n * @param {HTMLLinkElement} link - The link element.\n * @param {ExternalLinkParameters} params\n */\nfunction addLinkAttributes(link, { url, target, rel, } = {}) {\n  link.href = link.title = (url ? removeNullCharacters(url) : '');\n\n  if (url) {\n    const LinkTargetValues = Object.values(LinkTarget);\n    let targetIndex =\n      LinkTargetValues.includes(target) ? target : LinkTarget.NONE;\n    link.target = LinkTargetStringMap[targetIndex];\n\n    link.rel = (typeof rel === 'string' ? rel : DEFAULT_LINK_REL);\n  }\n}\n\n// Gets the file name from a given URL.\nfunction getFilenameFromUrl(url) {\n  var anchor = url.indexOf('#');\n  var query = url.indexOf('?');\n  var end = Math.min(\n    anchor > 0 ? anchor : url.length,\n    query > 0 ? query : url.length);\n  return url.substring(url.lastIndexOf('/', end) + 1, end);\n}\n\nclass StatTimer {\n  constructor(enable = true) {\n    this.enabled = !!enable;\n    this.started = Object.create(null);\n    this.times = [];\n  }\n\n  time(name) {\n    if (!this.enabled) {\n      return;\n    }\n    if (name in this.started) {\n      warn('Timer is already running for ' + name);\n    }\n    this.started[name] = Date.now();\n  }\n\n  timeEnd(name) {\n    if (!this.enabled) {\n      return;\n    }\n    if (!(name in this.started)) {\n      warn('Timer has not been started for ' + name);\n    }\n    this.times.push({\n      'name': name,\n      'start': this.started[name],\n      'end': Date.now(),\n    });\n    // Remove timer from started so it can be called again.\n    delete this.started[name];\n  }\n\n  toString() {\n    let times = this.times;\n    // Find the longest name for padding purposes.\n    let out = '', longest = 0;\n    for (let i = 0, ii = times.length; i < ii; ++i) {\n      let name = times[i]['name'];\n      if (name.length > longest) {\n        longest = name.length;\n      }\n    }\n    for (let i = 0, ii = times.length; i < ii; ++i) {\n      let span = times[i];\n      let duration = span.end - span.start;\n      out += `${span['name'].padEnd(longest)} ${duration}ms\\n`;\n    }\n    return out;\n  }\n}\n\n/**\n * Helps avoid having to initialize {StatTimer} instances, e.g. one for every\n * page, in cases where the collected stats are not actually being used.\n * This (dummy) class can thus, since all its methods are `static`, be directly\n * shared between multiple call-sites without the need to be initialized first.\n *\n * NOTE: This must implement the same interface as {StatTimer}.\n */\nclass DummyStatTimer {\n  constructor() {\n    unreachable('Cannot initialize DummyStatTimer.');\n  }\n\n  static time(name) {}\n\n  static timeEnd(name) {}\n\n  static toString() {\n    return '';\n  }\n}\n\nfunction loadScript(src) {\n  return new Promise((resolve, reject) => {\n    let script = document.createElement('script');\n    script.src = src;\n\n    script.onload = resolve;\n    script.onerror = function() {\n      reject(new Error(`Cannot load script at: ${script.src}`));\n    };\n    (document.head || document.documentElement).appendChild(script);\n  });\n}\n\nexport {\n  PageViewport,\n  RenderingCancelledException,\n  addLinkAttributes,\n  getFilenameFromUrl,\n  LinkTarget,\n  DEFAULT_LINK_REL,\n  DOMCanvasFactory,\n  DOMCMapReaderFactory,\n  DOMSVGFactory,\n  StatTimer,\n  DummyStatTimer,\n  loadScript,\n};\n","/* Copyright 2012 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport {\n  assert, bytesToString, isEvalSupported, shadow, string32, unreachable,\n  UNSUPPORTED_FEATURES, warn\n} from '../shared/util';\n\nclass BaseFontLoader {\n  constructor({ docId, onUnsupportedFeature, }) {\n    if (this.constructor === BaseFontLoader) {\n      unreachable('Cannot initialize BaseFontLoader.');\n    }\n    this.docId = docId;\n    this._onUnsupportedFeature = onUnsupportedFeature;\n\n    this.nativeFontFaces = [];\n    this.styleElement = null;\n  }\n\n  addNativeFontFace(nativeFontFace) {\n    this.nativeFontFaces.push(nativeFontFace);\n    document.fonts.add(nativeFontFace);\n  }\n\n  insertRule(rule) {\n    let styleElement = this.styleElement;\n    if (!styleElement) {\n      styleElement = this.styleElement = document.createElement('style');\n      styleElement.id = `PDFJS_FONT_STYLE_TAG_${this.docId}`;\n      document.documentElement.getElementsByTagName('head')[0].appendChild(\n        styleElement);\n    }\n\n    const styleSheet = styleElement.sheet;\n    styleSheet.insertRule(rule, styleSheet.cssRules.length);\n  }\n\n  clear() {\n    this.nativeFontFaces.forEach(function(nativeFontFace) {\n      document.fonts.delete(nativeFontFace);\n    });\n    this.nativeFontFaces.length = 0;\n\n    if (this.styleElement) {\n      // Note: ChildNode.remove doesn't throw if the parentNode is undefined.\n      this.styleElement.remove();\n      this.styleElement = null;\n    }\n  }\n\n  async bind(font) {\n    // Add the font to the DOM only once; skip if the font is already loaded.\n    if (font.attached || font.missingFile) {\n      return;\n    }\n    font.attached = true;\n\n    if (this.isFontLoadingAPISupported) {\n      const nativeFontFace = font.createNativeFontFace();\n      if (nativeFontFace) {\n        this.addNativeFontFace(nativeFontFace);\n        try {\n          await nativeFontFace.loaded;\n        } catch (ex) {\n          this._onUnsupportedFeature({ featureId: UNSUPPORTED_FEATURES.font, });\n          warn(`Failed to load font '${nativeFontFace.family}': '${ex}'.`);\n\n          // When font loading failed, fall back to the built-in font renderer.\n          font.disableFontFace = true;\n          throw ex;\n        }\n      }\n      return; // The font was, asynchronously, loaded.\n    }\n\n    // !this.isFontLoadingAPISupported\n    const rule = font.createFontFaceRule();\n    if (rule) {\n      this.insertRule(rule);\n\n      if (this.isSyncFontLoadingSupported) {\n        return; // The font was, synchronously, loaded.\n      }\n      return new Promise((resolve) => {\n        const request = this._queueLoadingCallback(resolve);\n        this._prepareFontLoadEvent([rule], [font], request);\n      });\n    }\n  }\n\n  _queueLoadingCallback(callback) {\n    unreachable('Abstract method `_queueLoadingCallback`.');\n  }\n\n  get isFontLoadingAPISupported() {\n    unreachable('Abstract method `isFontLoadingAPISupported`.');\n  }\n\n  get isSyncFontLoadingSupported() {\n    unreachable('Abstract method `isSyncFontLoadingSupported`.');\n  }\n\n  get _loadTestFont() {\n    unreachable('Abstract method `_loadTestFont`.');\n  }\n\n  _prepareFontLoadEvent(rules, fontsToLoad, request) {\n    unreachable('Abstract method `_prepareFontLoadEvent`.');\n  }\n}\n\nlet FontLoader;\nif (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('MOZCENTRAL')) {\n\nFontLoader = class MozcentralFontLoader extends BaseFontLoader {\n  get isFontLoadingAPISupported() {\n    return shadow(this, 'isFontLoadingAPISupported',\n                  typeof document !== 'undefined' && !!document.fonts);\n  }\n\n  get isSyncFontLoadingSupported() {\n    return shadow(this, 'isSyncFontLoadingSupported', true);\n  }\n};\n\n} else { // PDFJSDev.test('CHROME || GENERIC')\n\nFontLoader = class GenericFontLoader extends BaseFontLoader {\n  constructor(docId) {\n    super(docId);\n    this.loadingContext = {\n      requests: [],\n      nextRequestId: 0,\n    };\n    this.loadTestFontId = 0;\n  }\n\n  get isFontLoadingAPISupported() {\n    let supported = (typeof document !== 'undefined' && !!document.fonts);\n\n    if ((typeof PDFJSDev === 'undefined' || !PDFJSDev.test('CHROME')) &&\n        (supported && typeof navigator !== 'undefined')) {\n      // The Firefox Font Loading API does not work with `mozPrintCallback`\n      // prior to version 63; see https://bugzilla.mozilla.org/show_bug.cgi?id=1473742\n      const m = /Mozilla\\/5.0.*?rv:(\\d+).*? Gecko/.exec(navigator.userAgent);\n      if (m && m[1] < 63) {\n        supported = false;\n      }\n    }\n    return shadow(this, 'isFontLoadingAPISupported', supported);\n  }\n\n  get isSyncFontLoadingSupported() {\n    let supported = false;\n    if (typeof PDFJSDev === 'undefined' || !PDFJSDev.test('CHROME')) {\n      if (typeof navigator === 'undefined') {\n        // Node.js - we can pretend that sync font loading is supported.\n        supported = true;\n      } else {\n        // User agent string sniffing is bad, but there is no reliable way to\n        // tell if the font is fully loaded and ready to be used with canvas.\n        const m = /Mozilla\\/5.0.*?rv:(\\d+).*? Gecko/.exec(navigator.userAgent);\n        if (m && m[1] >= 14) {\n          supported = true;\n        }\n        // TODO - other browsers...\n      }\n    }\n    return shadow(this, 'isSyncFontLoadingSupported', supported);\n  }\n\n  _queueLoadingCallback(callback) {\n    function completeRequest() {\n      assert(!request.done, 'completeRequest() cannot be called twice.');\n      request.done = true;\n\n      // Sending all completed requests in order of how they were queued.\n      while (context.requests.length > 0 && context.requests[0].done) {\n        const otherRequest = context.requests.shift();\n        setTimeout(otherRequest.callback, 0);\n      }\n    }\n\n    const context = this.loadingContext;\n    const request = {\n      id: `pdfjs-font-loading-${context.nextRequestId++}`,\n      done: false,\n      complete: completeRequest,\n      callback,\n    };\n    context.requests.push(request);\n    return request;\n  }\n\n  get _loadTestFont() {\n    const getLoadTestFont = function() {\n      // This is a CFF font with 1 glyph for '.' that fills its entire width and\n      // height.\n      return atob(\n        'T1RUTwALAIAAAwAwQ0ZGIDHtZg4AAAOYAAAAgUZGVE1lkzZwAAAEHAAAABxHREVGABQA' +\n        'FQAABDgAAAAeT1MvMlYNYwkAAAEgAAAAYGNtYXABDQLUAAACNAAAAUJoZWFk/xVFDQAA' +\n        'ALwAAAA2aGhlYQdkA+oAAAD0AAAAJGhtdHgD6AAAAAAEWAAAAAZtYXhwAAJQAAAAARgA' +\n        'AAAGbmFtZVjmdH4AAAGAAAAAsXBvc3T/hgAzAAADeAAAACAAAQAAAAEAALZRFsRfDzz1' +\n        'AAsD6AAAAADOBOTLAAAAAM4KHDwAAAAAA+gDIQAAAAgAAgAAAAAAAAABAAADIQAAAFoD' +\n        '6AAAAAAD6AABAAAAAAAAAAAAAAAAAAAAAQAAUAAAAgAAAAQD6AH0AAUAAAKKArwAAACM' +\n        'AooCvAAAAeAAMQECAAACAAYJAAAAAAAAAAAAAQAAAAAAAAAAAAAAAFBmRWQAwAAuAC4D' +\n        'IP84AFoDIQAAAAAAAQAAAAAAAAAAACAAIAABAAAADgCuAAEAAAAAAAAAAQAAAAEAAAAA' +\n        'AAEAAQAAAAEAAAAAAAIAAQAAAAEAAAAAAAMAAQAAAAEAAAAAAAQAAQAAAAEAAAAAAAUA' +\n        'AQAAAAEAAAAAAAYAAQAAAAMAAQQJAAAAAgABAAMAAQQJAAEAAgABAAMAAQQJAAIAAgAB' +\n        'AAMAAQQJAAMAAgABAAMAAQQJAAQAAgABAAMAAQQJAAUAAgABAAMAAQQJAAYAAgABWABY' +\n        'AAAAAAAAAwAAAAMAAAAcAAEAAAAAADwAAwABAAAAHAAEACAAAAAEAAQAAQAAAC7//wAA' +\n        'AC7////TAAEAAAAAAAABBgAAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA' +\n        'AAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA' +\n        'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA' +\n        'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA' +\n        'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA' +\n        'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMAAAAAAAD/gwAyAAAAAQAAAAAAAAAAAAAAAAAA' +\n        'AAABAAQEAAEBAQJYAAEBASH4DwD4GwHEAvgcA/gXBIwMAYuL+nz5tQXkD5j3CBLnEQAC' +\n        'AQEBIVhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYAAABAQAADwACAQEEE/t3' +\n        'Dov6fAH6fAT+fPp8+nwHDosMCvm1Cvm1DAz6fBQAAAAAAAABAAAAAMmJbzEAAAAAzgTj' +\n        'FQAAAADOBOQpAAEAAAAAAAAADAAUAAQAAAABAAAAAgABAAAAAAAAAAAD6AAAAAAAAA==');\n    };\n    return shadow(this, '_loadTestFont', getLoadTestFont());\n  }\n\n  _prepareFontLoadEvent(rules, fonts, request) {\n    /** Hack begin */\n    // There's currently no event when a font has finished downloading so the\n    // following code is a dirty hack to 'guess' when a font is ready.\n    // It's assumed fonts are loaded in order, so add a known test font after\n    // the desired fonts and then test for the loading of that test font.\n\n    function int32(data, offset) {\n      return (data.charCodeAt(offset) << 24) |\n             (data.charCodeAt(offset + 1) << 16) |\n             (data.charCodeAt(offset + 2) << 8) |\n             (data.charCodeAt(offset + 3) & 0xff);\n    }\n    function spliceString(s, offset, remove, insert) {\n      let chunk1 = s.substring(0, offset);\n      let chunk2 = s.substring(offset + remove);\n      return chunk1 + insert + chunk2;\n    }\n    let i, ii;\n\n    // The temporary canvas is used to determine if fonts are loaded.\n    let canvas = document.createElement('canvas');\n    canvas.width = 1;\n    canvas.height = 1;\n    let ctx = canvas.getContext('2d');\n\n    let called = 0;\n    function isFontReady(name, callback) {\n      called++;\n      // With setTimeout clamping this gives the font ~100ms to load.\n      if (called > 30) {\n        warn('Load test font never loaded.');\n        callback();\n        return;\n      }\n      ctx.font = '30px ' + name;\n      ctx.fillText('.', 0, 20);\n      let imageData = ctx.getImageData(0, 0, 1, 1);\n      if (imageData.data[3] > 0) {\n        callback();\n        return;\n      }\n      setTimeout(isFontReady.bind(null, name, callback));\n    }\n\n    const loadTestFontId = `lt${Date.now()}${this.loadTestFontId++}`;\n    // Chromium seems to cache fonts based on a hash of the actual font data,\n    // so the font must be modified for each load test else it will appear to\n    // be loaded already.\n    // TODO: This could maybe be made faster by avoiding the btoa of the full\n    // font by splitting it in chunks before hand and padding the font id.\n    let data = this._loadTestFont;\n    let COMMENT_OFFSET = 976; // has to be on 4 byte boundary (for checksum)\n    data = spliceString(data, COMMENT_OFFSET, loadTestFontId.length,\n                        loadTestFontId);\n    // CFF checksum is important for IE, adjusting it\n    let CFF_CHECKSUM_OFFSET = 16;\n    let XXXX_VALUE = 0x58585858; // the \"comment\" filled with 'X'\n    let checksum = int32(data, CFF_CHECKSUM_OFFSET);\n    for (i = 0, ii = loadTestFontId.length - 3; i < ii; i += 4) {\n      checksum = (checksum - XXXX_VALUE + int32(loadTestFontId, i)) | 0;\n    }\n    if (i < loadTestFontId.length) { // align to 4 bytes boundary\n      checksum = (checksum - XXXX_VALUE + int32(loadTestFontId + 'XXX', i)) | 0;\n    }\n    data = spliceString(data, CFF_CHECKSUM_OFFSET, 4, string32(checksum));\n\n    const url = `url(data:font/opentype;base64,${btoa(data)});`;\n    const rule = `@font-face {font-family:\"${loadTestFontId}\";src:${url}}`;\n    this.insertRule(rule);\n\n    let names = [];\n    for (i = 0, ii = fonts.length; i < ii; i++) {\n      names.push(fonts[i].loadedName);\n    }\n    names.push(loadTestFontId);\n\n    let div = document.createElement('div');\n    div.setAttribute('style', 'visibility: hidden;' +\n                              'width: 10px; height: 10px;' +\n                              'position: absolute; top: 0px; left: 0px;');\n    for (i = 0, ii = names.length; i < ii; ++i) {\n      let span = document.createElement('span');\n      span.textContent = 'Hi';\n      span.style.fontFamily = names[i];\n      div.appendChild(span);\n    }\n    document.body.appendChild(div);\n\n    isFontReady(loadTestFontId, function() {\n      document.body.removeChild(div);\n      request.complete();\n    });\n    /** Hack end */\n  }\n};\n\n} // End of PDFJSDev.test('CHROME || GENERIC')\n\nconst IsEvalSupportedCached = {\n  get value() {\n    return shadow(this, 'value', isEvalSupported());\n  },\n};\n\nclass FontFaceObject {\n  constructor(translatedData, { isEvalSupported = true,\n                                disableFontFace = false,\n                                ignoreErrors = false,\n                                onUnsupportedFeature = null,\n                                fontRegistry = null, }) {\n    this.compiledGlyphs = Object.create(null);\n    // importing translated data\n    for (let i in translatedData) {\n      this[i] = translatedData[i];\n    }\n    this.isEvalSupported = isEvalSupported !== false;\n    this.disableFontFace = disableFontFace === true;\n    this.ignoreErrors = ignoreErrors === true;\n    this._onUnsupportedFeature = onUnsupportedFeature;\n    this.fontRegistry = fontRegistry;\n  }\n\n  createNativeFontFace() {\n    if (!this.data || this.disableFontFace) {\n      return null;\n    }\n    const nativeFontFace = new FontFace(this.loadedName, this.data, {});\n\n    if (this.fontRegistry) {\n      this.fontRegistry.registerFont(this);\n    }\n    return nativeFontFace;\n  }\n\n  createFontFaceRule() {\n    if (!this.data || this.disableFontFace) {\n      return null;\n    }\n    const data = bytesToString(new Uint8Array(this.data));\n    // Add the @font-face rule to the document.\n    const url = `url(data:${this.mimetype};base64,${btoa(data)});`;\n    const rule = `@font-face {font-family:\"${this.loadedName}\";src:${url}}`;\n\n    if (this.fontRegistry) {\n      this.fontRegistry.registerFont(this, url);\n    }\n    return rule;\n  }\n\n  getPathGenerator(objs, character) {\n    if (this.compiledGlyphs[character] !== undefined) {\n      return this.compiledGlyphs[character];\n    }\n\n    let cmds, current;\n    try {\n      cmds = objs.get(this.loadedName + '_path_' + character);\n    } catch (ex) {\n      if (!this.ignoreErrors) {\n        throw ex;\n      }\n      if (this._onUnsupportedFeature) {\n        this._onUnsupportedFeature({ featureId: UNSUPPORTED_FEATURES.font, });\n      }\n      warn(`getPathGenerator - ignoring character: \"${ex}\".`);\n\n      return this.compiledGlyphs[character] = function(c, size) {\n        // No-op function, to allow rendering to continue.\n      };\n    }\n\n    // If we can, compile cmds into JS for MAXIMUM SPEED...\n    if (this.isEvalSupported && IsEvalSupportedCached.value) {\n      let args, js = '';\n      for (let i = 0, ii = cmds.length; i < ii; i++) {\n        current = cmds[i];\n\n        if (current.args !== undefined) {\n          args = current.args.join(',');\n        } else {\n          args = '';\n        }\n        js += 'c.' + current.cmd + '(' + args + ');\\n';\n      }\n      // eslint-disable-next-line no-new-func\n      return this.compiledGlyphs[character] = new Function('c', 'size', js);\n    }\n    // ... but fall back on using Function.prototype.apply() if we're\n    // blocked from using eval() for whatever reason (like CSP policies).\n    return this.compiledGlyphs[character] = function(c, size) {\n      for (let i = 0, ii = cmds.length; i < ii; i++) {\n        current = cmds[i];\n\n        if (current.cmd === 'scale') {\n          current.args = [size, -size];\n        }\n        c[current.cmd].apply(c, current.args);\n      }\n    };\n  }\n}\n\nexport {\n  FontFaceObject,\n  FontLoader,\n};\n","/* Copyright 2018 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nlet compatibilityParams = Object.create(null);\nif (typeof PDFJSDev === 'undefined' || PDFJSDev.test('GENERIC')) {\n  const isNodeJS = require('../shared/is_node');\n\n  const userAgent =\n    (typeof navigator !== 'undefined' && navigator.userAgent) || '';\n  const isIE = /Trident/.test(userAgent);\n  const isIOSChrome = /CriOS/.test(userAgent);\n\n  // Checks if possible to use URL.createObjectURL()\n  // Support: IE, Chrome on iOS\n  (function checkOnBlobSupport() {\n    // Sometimes IE and Chrome on iOS losing the data created with\n    // createObjectURL(), see issues #3977 and #8081.\n    if (isIE || isIOSChrome) {\n      compatibilityParams.disableCreateObjectURL = true;\n    }\n  })();\n\n  // Support: Node.js\n  (function checkFontFaceAndImage() {\n    // Node.js is missing native support for `@font-face` and `Image`.\n    if (isNodeJS()) {\n      compatibilityParams.disableFontFace = true;\n      compatibilityParams.nativeImageDecoderSupport = 'none';\n    }\n  })();\n}\n\nexports.apiCompatibilityParams = Object.freeze(compatibilityParams);\n","/* Copyright 2012 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport {\n  FONT_IDENTITY_MATRIX, IDENTITY_MATRIX, ImageKind, info, isLittleEndian, isNum,\n  OPS, shadow, TextRenderingMode, unreachable, Util, warn\n} from '../shared/util';\nimport { getShadingPatternFromIR, TilingPattern } from './pattern_helper';\n\n// <canvas> contexts store most of the state we need natively.\n// However, PDF needs a bit more state, which we store here.\n\n// Minimal font size that would be used during canvas fillText operations.\nvar MIN_FONT_SIZE = 16;\n// Maximum font size that would be used during canvas fillText operations.\nvar MAX_FONT_SIZE = 100;\nvar MAX_GROUP_SIZE = 4096;\n\n// Heuristic value used when enforcing minimum line widths.\nvar MIN_WIDTH_FACTOR = 0.65;\n\nvar COMPILE_TYPE3_GLYPHS = true;\nvar MAX_SIZE_TO_COMPILE = 1000;\n\nvar FULL_CHUNK_HEIGHT = 16;\n\nvar IsLittleEndianCached = {\n  get value() {\n    return shadow(IsLittleEndianCached, 'value', isLittleEndian());\n  },\n};\n\nfunction addContextCurrentTransform(ctx) {\n  // If the context doesn't expose a `mozCurrentTransform`, add a JS based one.\n  if (!ctx.mozCurrentTransform) {\n    ctx._originalSave = ctx.save;\n    ctx._originalRestore = ctx.restore;\n    ctx._originalRotate = ctx.rotate;\n    ctx._originalScale = ctx.scale;\n    ctx._originalTranslate = ctx.translate;\n    ctx._originalTransform = ctx.transform;\n    ctx._originalSetTransform = ctx.setTransform;\n\n    ctx._transformMatrix = ctx._transformMatrix || [1, 0, 0, 1, 0, 0];\n    ctx._transformStack = [];\n\n    Object.defineProperty(ctx, 'mozCurrentTransform', {\n      get: function getCurrentTransform() {\n        return this._transformMatrix;\n      },\n    });\n\n    Object.defineProperty(ctx, 'mozCurrentTransformInverse', {\n      get: function getCurrentTransformInverse() {\n        // Calculation done using WolframAlpha:\n        // http://www.wolframalpha.com/input/?\n        //   i=Inverse+{{a%2C+c%2C+e}%2C+{b%2C+d%2C+f}%2C+{0%2C+0%2C+1}}\n\n        var m = this._transformMatrix;\n        var a = m[0], b = m[1], c = m[2], d = m[3], e = m[4], f = m[5];\n\n        var ad_bc = a * d - b * c;\n        var bc_ad = b * c - a * d;\n\n        return [\n          d / ad_bc,\n          b / bc_ad,\n          c / bc_ad,\n          a / ad_bc,\n          (d * e - c * f) / bc_ad,\n          (b * e - a * f) / ad_bc\n        ];\n      },\n    });\n\n    ctx.save = function ctxSave() {\n      var old = this._transformMatrix;\n      this._transformStack.push(old);\n      this._transformMatrix = old.slice(0, 6);\n\n      this._originalSave();\n    };\n\n    ctx.restore = function ctxRestore() {\n      var prev = this._transformStack.pop();\n      if (prev) {\n        this._transformMatrix = prev;\n        this._originalRestore();\n      }\n    };\n\n    ctx.translate = function ctxTranslate(x, y) {\n      var m = this._transformMatrix;\n      m[4] = m[0] * x + m[2] * y + m[4];\n      m[5] = m[1] * x + m[3] * y + m[5];\n\n      this._originalTranslate(x, y);\n    };\n\n    ctx.scale = function ctxScale(x, y) {\n      var m = this._transformMatrix;\n      m[0] = m[0] * x;\n      m[1] = m[1] * x;\n      m[2] = m[2] * y;\n      m[3] = m[3] * y;\n\n      this._originalScale(x, y);\n    };\n\n    ctx.transform = function ctxTransform(a, b, c, d, e, f) {\n      var m = this._transformMatrix;\n      this._transformMatrix = [\n        m[0] * a + m[2] * b,\n        m[1] * a + m[3] * b,\n        m[0] * c + m[2] * d,\n        m[1] * c + m[3] * d,\n        m[0] * e + m[2] * f + m[4],\n        m[1] * e + m[3] * f + m[5]\n      ];\n\n      ctx._originalTransform(a, b, c, d, e, f);\n    };\n\n    ctx.setTransform = function ctxSetTransform(a, b, c, d, e, f) {\n      this._transformMatrix = [a, b, c, d, e, f];\n\n      ctx._originalSetTransform(a, b, c, d, e, f);\n    };\n\n    ctx.rotate = function ctxRotate(angle) {\n      var cosValue = Math.cos(angle);\n      var sinValue = Math.sin(angle);\n\n      var m = this._transformMatrix;\n      this._transformMatrix = [\n        m[0] * cosValue + m[2] * sinValue,\n        m[1] * cosValue + m[3] * sinValue,\n        m[0] * (-sinValue) + m[2] * cosValue,\n        m[1] * (-sinValue) + m[3] * cosValue,\n        m[4],\n        m[5]\n      ];\n\n      this._originalRotate(angle);\n    };\n  }\n}\n\nvar CachedCanvases = (function CachedCanvasesClosure() {\n  function CachedCanvases(canvasFactory) {\n    this.canvasFactory = canvasFactory;\n    this.cache = Object.create(null);\n  }\n  CachedCanvases.prototype = {\n    getCanvas: function CachedCanvases_getCanvas(id, width, height,\n                                                 trackTransform) {\n      var canvasEntry;\n      if (this.cache[id] !== undefined) {\n        canvasEntry = this.cache[id];\n        this.canvasFactory.reset(canvasEntry, width, height);\n        // reset canvas transform for emulated mozCurrentTransform, if needed\n        canvasEntry.context.setTransform(1, 0, 0, 1, 0, 0);\n      } else {\n        canvasEntry = this.canvasFactory.create(width, height);\n        this.cache[id] = canvasEntry;\n      }\n      if (trackTransform) {\n        addContextCurrentTransform(canvasEntry.context);\n      }\n      return canvasEntry;\n    },\n    clear() {\n      for (var id in this.cache) {\n        var canvasEntry = this.cache[id];\n        this.canvasFactory.destroy(canvasEntry);\n        delete this.cache[id];\n      }\n    },\n  };\n  return CachedCanvases;\n})();\n\nfunction compileType3Glyph(imgData) {\n  var POINT_TO_PROCESS_LIMIT = 1000;\n\n  var width = imgData.width, height = imgData.height;\n  var i, j, j0, width1 = width + 1;\n  var points = new Uint8Array(width1 * (height + 1));\n  var POINT_TYPES =\n      new Uint8Array([0, 2, 4, 0, 1, 0, 5, 4, 8, 10, 0, 8, 0, 2, 1, 0]);\n\n  // decodes bit-packed mask data\n  var lineSize = (width + 7) & ~7, data0 = imgData.data;\n  var data = new Uint8Array(lineSize * height), pos = 0, ii;\n  for (i = 0, ii = data0.length; i < ii; i++) {\n    var mask = 128, elem = data0[i];\n    while (mask > 0) {\n      data[pos++] = (elem & mask) ? 0 : 255;\n      mask >>= 1;\n    }\n  }\n\n  // finding interesting points: every point is located between mask pixels,\n  // so there will be points of the (width + 1)x(height + 1) grid. Every point\n  // will have flags assigned based on neighboring mask pixels:\n  //   4 | 8\n  //   --P--\n  //   2 | 1\n  // We are interested only in points with the flags:\n  //   - outside corners: 1, 2, 4, 8;\n  //   - inside corners: 7, 11, 13, 14;\n  //   - and, intersections: 5, 10.\n  var count = 0;\n  pos = 0;\n  if (data[pos] !== 0) {\n    points[0] = 1;\n    ++count;\n  }\n  for (j = 1; j < width; j++) {\n    if (data[pos] !== data[pos + 1]) {\n      points[j] = data[pos] ? 2 : 1;\n      ++count;\n    }\n    pos++;\n  }\n  if (data[pos] !== 0) {\n    points[j] = 2;\n    ++count;\n  }\n  for (i = 1; i < height; i++) {\n    pos = i * lineSize;\n    j0 = i * width1;\n    if (data[pos - lineSize] !== data[pos]) {\n      points[j0] = data[pos] ? 1 : 8;\n      ++count;\n    }\n    // 'sum' is the position of the current pixel configuration in the 'TYPES'\n    // array (in order 8-1-2-4, so we can use '>>2' to shift the column).\n    var sum = (data[pos] ? 4 : 0) + (data[pos - lineSize] ? 8 : 0);\n    for (j = 1; j < width; j++) {\n      sum = (sum >> 2) + (data[pos + 1] ? 4 : 0) +\n            (data[pos - lineSize + 1] ? 8 : 0);\n      if (POINT_TYPES[sum]) {\n        points[j0 + j] = POINT_TYPES[sum];\n        ++count;\n      }\n      pos++;\n    }\n    if (data[pos - lineSize] !== data[pos]) {\n      points[j0 + j] = data[pos] ? 2 : 4;\n      ++count;\n    }\n\n    if (count > POINT_TO_PROCESS_LIMIT) {\n      return null;\n    }\n  }\n\n  pos = lineSize * (height - 1);\n  j0 = i * width1;\n  if (data[pos] !== 0) {\n    points[j0] = 8;\n    ++count;\n  }\n  for (j = 1; j < width; j++) {\n    if (data[pos] !== data[pos + 1]) {\n      points[j0 + j] = data[pos] ? 4 : 8;\n      ++count;\n    }\n    pos++;\n  }\n  if (data[pos] !== 0) {\n    points[j0 + j] = 4;\n    ++count;\n  }\n  if (count > POINT_TO_PROCESS_LIMIT) {\n    return null;\n  }\n\n  // building outlines\n  var steps = new Int32Array([0, width1, -1, 0, -width1, 0, 0, 0, 1]);\n  var outlines = [];\n  for (i = 0; count && i <= height; i++) {\n    var p = i * width1;\n    var end = p + width;\n    while (p < end && !points[p]) {\n      p++;\n    }\n    if (p === end) {\n      continue;\n    }\n    var coords = [p % width1, i];\n\n    var type = points[p], p0 = p, pp;\n    do {\n      var step = steps[type];\n      do {\n        p += step;\n      } while (!points[p]);\n\n      pp = points[p];\n      if (pp !== 5 && pp !== 10) {\n        // set new direction\n        type = pp;\n        // delete mark\n        points[p] = 0;\n      } else { // type is 5 or 10, ie, a crossing\n        // set new direction\n        type = pp & ((0x33 * type) >> 4);\n        // set new type for \"future hit\"\n        points[p] &= (type >> 2 | type << 2);\n      }\n\n      coords.push(p % width1);\n      coords.push((p / width1) | 0);\n      --count;\n    } while (p0 !== p);\n    outlines.push(coords);\n    --i;\n  }\n\n  var drawOutline = function(c) {\n    c.save();\n    // the path shall be painted in [0..1]x[0..1] space\n    c.scale(1 / width, -1 / height);\n    c.translate(0, -height);\n    c.beginPath();\n    for (var i = 0, ii = outlines.length; i < ii; i++) {\n      var o = outlines[i];\n      c.moveTo(o[0], o[1]);\n      for (var j = 2, jj = o.length; j < jj; j += 2) {\n        c.lineTo(o[j], o[j + 1]);\n      }\n    }\n    c.fill();\n    c.beginPath();\n    c.restore();\n  };\n\n  return drawOutline;\n}\n\nvar CanvasExtraState = (function CanvasExtraStateClosure() {\n  function CanvasExtraState() {\n    // Are soft masks and alpha values shapes or opacities?\n    this.alphaIsShape = false;\n    this.fontSize = 0;\n    this.fontSizeScale = 1;\n    this.textMatrix = IDENTITY_MATRIX;\n    this.textMatrixScale = 1;\n    this.fontMatrix = FONT_IDENTITY_MATRIX;\n    this.leading = 0;\n    // Current point (in user coordinates)\n    this.x = 0;\n    this.y = 0;\n    // Start of text line (in text coordinates)\n    this.lineX = 0;\n    this.lineY = 0;\n    // Character and word spacing\n    this.charSpacing = 0;\n    this.wordSpacing = 0;\n    this.textHScale = 1;\n    this.textRenderingMode = TextRenderingMode.FILL;\n    this.textRise = 0;\n    // Default fore and background colors\n    this.fillColor = '#000000';\n    this.strokeColor = '#000000';\n    this.patternFill = false;\n    // Note: fill alpha applies to all non-stroking operations\n    this.fillAlpha = 1;\n    this.strokeAlpha = 1;\n    this.lineWidth = 1;\n    this.activeSMask = null;\n    this.resumeSMaskCtx = null; // nonclonable field (see the save method below)\n  }\n\n  CanvasExtraState.prototype = {\n    clone: function CanvasExtraState_clone() {\n      return Object.create(this);\n    },\n    setCurrentPoint: function CanvasExtraState_setCurrentPoint(x, y) {\n      this.x = x;\n      this.y = y;\n    },\n  };\n  return CanvasExtraState;\n})();\n\nvar CanvasGraphics = (function CanvasGraphicsClosure() {\n  // Defines the time the executeOperatorList is going to be executing\n  // before it stops and shedules a continue of execution.\n  var EXECUTION_TIME = 15;\n  // Defines the number of steps before checking the execution time\n  var EXECUTION_STEPS = 10;\n\n  function CanvasGraphics(canvasCtx, commonObjs, objs, canvasFactory,\n                          webGLContext, imageLayer) {\n    this.ctx = canvasCtx;\n    this.current = new CanvasExtraState();\n    this.stateStack = [];\n    this.pendingClip = null;\n    this.pendingEOFill = false;\n    this.res = null;\n    this.xobjs = null;\n    this.commonObjs = commonObjs;\n    this.objs = objs;\n    this.canvasFactory = canvasFactory;\n    this.webGLContext = webGLContext;\n    this.imageLayer = imageLayer;\n    this.groupStack = [];\n    this.processingType3 = null;\n    // Patterns are painted relative to the initial page/form transform, see pdf\n    // spec 8.7.2 NOTE 1.\n    this.baseTransform = null;\n    this.baseTransformStack = [];\n    this.groupLevel = 0;\n    this.smaskStack = [];\n    this.smaskCounter = 0;\n    this.tempSMask = null;\n    this.cachedCanvases = new CachedCanvases(this.canvasFactory);\n    if (canvasCtx) {\n      // NOTE: if mozCurrentTransform is polyfilled, then the current state of\n      // the transformation must already be set in canvasCtx._transformMatrix.\n      addContextCurrentTransform(canvasCtx);\n    }\n    this._cachedGetSinglePixelWidth = null;\n  }\n\n  function putBinaryImageData(ctx, imgData) {\n    if (typeof ImageData !== 'undefined' && imgData instanceof ImageData) {\n      ctx.putImageData(imgData, 0, 0);\n      return;\n    }\n\n    // Put the image data to the canvas in chunks, rather than putting the\n    // whole image at once.  This saves JS memory, because the ImageData object\n    // is smaller. It also possibly saves C++ memory within the implementation\n    // of putImageData(). (E.g. in Firefox we make two short-lived copies of\n    // the data passed to putImageData()). |n| shouldn't be too small, however,\n    // because too many putImageData() calls will slow things down.\n    //\n    // Note: as written, if the last chunk is partial, the putImageData() call\n    // will (conceptually) put pixels past the bounds of the canvas.  But\n    // that's ok; any such pixels are ignored.\n\n    var height = imgData.height, width = imgData.width;\n    var partialChunkHeight = height % FULL_CHUNK_HEIGHT;\n    var fullChunks = (height - partialChunkHeight) / FULL_CHUNK_HEIGHT;\n    var totalChunks = partialChunkHeight === 0 ? fullChunks : fullChunks + 1;\n\n    var chunkImgData = ctx.createImageData(width, FULL_CHUNK_HEIGHT);\n    var srcPos = 0, destPos;\n    var src = imgData.data;\n    var dest = chunkImgData.data;\n    var i, j, thisChunkHeight, elemsInThisChunk;\n\n    // There are multiple forms in which the pixel data can be passed, and\n    // imgData.kind tells us which one this is.\n    if (imgData.kind === ImageKind.GRAYSCALE_1BPP) {\n      // Grayscale, 1 bit per pixel (i.e. black-and-white).\n      var srcLength = src.byteLength;\n      var dest32 = new Uint32Array(dest.buffer, 0, dest.byteLength >> 2);\n      var dest32DataLength = dest32.length;\n      var fullSrcDiff = (width + 7) >> 3;\n      var white = 0xFFFFFFFF;\n      var black = IsLittleEndianCached.value ? 0xFF000000 : 0x000000FF;\n      for (i = 0; i < totalChunks; i++) {\n        thisChunkHeight =\n          (i < fullChunks) ? FULL_CHUNK_HEIGHT : partialChunkHeight;\n        destPos = 0;\n        for (j = 0; j < thisChunkHeight; j++) {\n          var srcDiff = srcLength - srcPos;\n          var k = 0;\n          var kEnd = (srcDiff > fullSrcDiff) ? width : srcDiff * 8 - 7;\n          var kEndUnrolled = kEnd & ~7;\n          var mask = 0;\n          var srcByte = 0;\n          for (; k < kEndUnrolled; k += 8) {\n            srcByte = src[srcPos++];\n            dest32[destPos++] = (srcByte & 128) ? white : black;\n            dest32[destPos++] = (srcByte & 64) ? white : black;\n            dest32[destPos++] = (srcByte & 32) ? white : black;\n            dest32[destPos++] = (srcByte & 16) ? white : black;\n            dest32[destPos++] = (srcByte & 8) ? white : black;\n            dest32[destPos++] = (srcByte & 4) ? white : black;\n            dest32[destPos++] = (srcByte & 2) ? white : black;\n            dest32[destPos++] = (srcByte & 1) ? white : black;\n          }\n          for (; k < kEnd; k++) {\n             if (mask === 0) {\n               srcByte = src[srcPos++];\n               mask = 128;\n             }\n\n            dest32[destPos++] = (srcByte & mask) ? white : black;\n            mask >>= 1;\n          }\n        }\n        // We ran out of input. Make all remaining pixels transparent.\n        while (destPos < dest32DataLength) {\n          dest32[destPos++] = 0;\n        }\n\n        ctx.putImageData(chunkImgData, 0, i * FULL_CHUNK_HEIGHT);\n      }\n    } else if (imgData.kind === ImageKind.RGBA_32BPP) {\n      // RGBA, 32-bits per pixel.\n\n      j = 0;\n      elemsInThisChunk = width * FULL_CHUNK_HEIGHT * 4;\n      for (i = 0; i < fullChunks; i++) {\n        dest.set(src.subarray(srcPos, srcPos + elemsInThisChunk));\n        srcPos += elemsInThisChunk;\n\n        ctx.putImageData(chunkImgData, 0, j);\n        j += FULL_CHUNK_HEIGHT;\n      }\n      if (i < totalChunks) {\n        elemsInThisChunk = width * partialChunkHeight * 4;\n        dest.set(src.subarray(srcPos, srcPos + elemsInThisChunk));\n        ctx.putImageData(chunkImgData, 0, j);\n      }\n\n    } else if (imgData.kind === ImageKind.RGB_24BPP) {\n      // RGB, 24-bits per pixel.\n      thisChunkHeight = FULL_CHUNK_HEIGHT;\n      elemsInThisChunk = width * thisChunkHeight;\n      for (i = 0; i < totalChunks; i++) {\n        if (i >= fullChunks) {\n          thisChunkHeight = partialChunkHeight;\n          elemsInThisChunk = width * thisChunkHeight;\n        }\n\n        destPos = 0;\n        for (j = elemsInThisChunk; j--;) {\n          dest[destPos++] = src[srcPos++];\n          dest[destPos++] = src[srcPos++];\n          dest[destPos++] = src[srcPos++];\n          dest[destPos++] = 255;\n        }\n        ctx.putImageData(chunkImgData, 0, i * FULL_CHUNK_HEIGHT);\n      }\n    } else {\n      throw new Error(`bad image kind: ${imgData.kind}`);\n    }\n  }\n\n  function putBinaryImageMask(ctx, imgData) {\n    var height = imgData.height, width = imgData.width;\n    var partialChunkHeight = height % FULL_CHUNK_HEIGHT;\n    var fullChunks = (height - partialChunkHeight) / FULL_CHUNK_HEIGHT;\n    var totalChunks = partialChunkHeight === 0 ? fullChunks : fullChunks + 1;\n\n    var chunkImgData = ctx.createImageData(width, FULL_CHUNK_HEIGHT);\n    var srcPos = 0;\n    var src = imgData.data;\n    var dest = chunkImgData.data;\n\n    for (var i = 0; i < totalChunks; i++) {\n      var thisChunkHeight =\n        (i < fullChunks) ? FULL_CHUNK_HEIGHT : partialChunkHeight;\n\n      // Expand the mask so it can be used by the canvas.  Any required\n      // inversion has already been handled.\n      var destPos = 3; // alpha component offset\n      for (var j = 0; j < thisChunkHeight; j++) {\n        var mask = 0;\n        for (var k = 0; k < width; k++) {\n          if (!mask) {\n            var elem = src[srcPos++];\n            mask = 128;\n          }\n          dest[destPos] = (elem & mask) ? 0 : 255;\n          destPos += 4;\n          mask >>= 1;\n        }\n      }\n      ctx.putImageData(chunkImgData, 0, i * FULL_CHUNK_HEIGHT);\n    }\n  }\n\n  function copyCtxState(sourceCtx, destCtx) {\n    var properties = ['strokeStyle', 'fillStyle', 'fillRule', 'globalAlpha',\n                      'lineWidth', 'lineCap', 'lineJoin', 'miterLimit',\n                      'globalCompositeOperation', 'font'];\n    for (var i = 0, ii = properties.length; i < ii; i++) {\n      var property = properties[i];\n      if (sourceCtx[property] !== undefined) {\n        destCtx[property] = sourceCtx[property];\n      }\n    }\n    if (sourceCtx.setLineDash !== undefined) {\n      destCtx.setLineDash(sourceCtx.getLineDash());\n      destCtx.lineDashOffset = sourceCtx.lineDashOffset;\n    }\n  }\n\n  function resetCtxToDefault(ctx) {\n    ctx.strokeStyle = '#000000';\n    ctx.fillStyle = '#000000';\n    ctx.fillRule = 'nonzero';\n    ctx.globalAlpha = 1;\n    ctx.lineWidth = 1;\n    ctx.lineCap = 'butt';\n    ctx.lineJoin = 'miter';\n    ctx.miterLimit = 10;\n    ctx.globalCompositeOperation = 'source-over';\n    ctx.font = '10px sans-serif';\n    if (ctx.setLineDash !== undefined) {\n      ctx.setLineDash([]);\n      ctx.lineDashOffset = 0;\n    }\n  }\n\n  function composeSMaskBackdrop(bytes, r0, g0, b0) {\n    var length = bytes.length;\n    for (var i = 3; i < length; i += 4) {\n      var alpha = bytes[i];\n      if (alpha === 0) {\n        bytes[i - 3] = r0;\n        bytes[i - 2] = g0;\n        bytes[i - 1] = b0;\n      } else if (alpha < 255) {\n        var alpha_ = 255 - alpha;\n        bytes[i - 3] = (bytes[i - 3] * alpha + r0 * alpha_) >> 8;\n        bytes[i - 2] = (bytes[i - 2] * alpha + g0 * alpha_) >> 8;\n        bytes[i - 1] = (bytes[i - 1] * alpha + b0 * alpha_) >> 8;\n      }\n    }\n  }\n\n  function composeSMaskAlpha(maskData, layerData, transferMap) {\n    var length = maskData.length;\n    var scale = 1 / 255;\n    for (var i = 3; i < length; i += 4) {\n      var alpha = transferMap ? transferMap[maskData[i]] : maskData[i];\n      layerData[i] = (layerData[i] * alpha * scale) | 0;\n    }\n  }\n\n  function composeSMaskLuminosity(maskData, layerData, transferMap) {\n    var length = maskData.length;\n    for (var i = 3; i < length; i += 4) {\n      var y = (maskData[i - 3] * 77) +  // * 0.3 / 255 * 0x10000\n              (maskData[i - 2] * 152) + // * 0.59 ....\n              (maskData[i - 1] * 28);   // * 0.11 ....\n      layerData[i] = transferMap ?\n        (layerData[i] * transferMap[y >> 8]) >> 8 :\n        (layerData[i] * y) >> 16;\n    }\n  }\n\n  function genericComposeSMask(maskCtx, layerCtx, width, height,\n                               subtype, backdrop, transferMap) {\n    var hasBackdrop = !!backdrop;\n    var r0 = hasBackdrop ? backdrop[0] : 0;\n    var g0 = hasBackdrop ? backdrop[1] : 0;\n    var b0 = hasBackdrop ? backdrop[2] : 0;\n\n    var composeFn;\n    if (subtype === 'Luminosity') {\n      composeFn = composeSMaskLuminosity;\n    } else {\n      composeFn = composeSMaskAlpha;\n    }\n\n    // processing image in chunks to save memory\n    var PIXELS_TO_PROCESS = 1048576;\n    var chunkSize = Math.min(height, Math.ceil(PIXELS_TO_PROCESS / width));\n    for (var row = 0; row < height; row += chunkSize) {\n      var chunkHeight = Math.min(chunkSize, height - row);\n      var maskData = maskCtx.getImageData(0, row, width, chunkHeight);\n      var layerData = layerCtx.getImageData(0, row, width, chunkHeight);\n\n      if (hasBackdrop) {\n        composeSMaskBackdrop(maskData.data, r0, g0, b0);\n      }\n      composeFn(maskData.data, layerData.data, transferMap);\n\n      maskCtx.putImageData(layerData, 0, row);\n    }\n  }\n\n  function composeSMask(ctx, smask, layerCtx, webGLContext) {\n    var mask = smask.canvas;\n    var maskCtx = smask.context;\n\n    ctx.setTransform(smask.scaleX, 0, 0, smask.scaleY,\n                     smask.offsetX, smask.offsetY);\n\n    var backdrop = smask.backdrop || null;\n    if (!smask.transferMap && webGLContext.isEnabled) {\n      let composed = webGLContext.composeSMask({\n        layer: layerCtx.canvas,\n        mask,\n        properties: {\n          subtype: smask.subtype,\n          backdrop,\n        },\n      });\n      ctx.setTransform(1, 0, 0, 1, 0, 0);\n      ctx.drawImage(composed, smask.offsetX, smask.offsetY);\n      return;\n    }\n    genericComposeSMask(maskCtx, layerCtx, mask.width, mask.height,\n                        smask.subtype, backdrop, smask.transferMap);\n    ctx.drawImage(mask, 0, 0);\n  }\n\n  var LINE_CAP_STYLES = ['butt', 'round', 'square'];\n  var LINE_JOIN_STYLES = ['miter', 'round', 'bevel'];\n  var NORMAL_CLIP = {};\n  var EO_CLIP = {};\n\n  CanvasGraphics.prototype = {\n\n    beginDrawing({ transform, viewport, transparency = false,\n                   background = null, }) {\n      // For pdfs that use blend modes we have to clear the canvas else certain\n      // blend modes can look wrong since we'd be blending with a white\n      // backdrop. The problem with a transparent backdrop though is we then\n      // don't get sub pixel anti aliasing on text, creating temporary\n      // transparent canvas when we have blend modes.\n      var width = this.ctx.canvas.width;\n      var height = this.ctx.canvas.height;\n\n      this.ctx.save();\n      this.ctx.fillStyle = background || 'rgb(255, 255, 255)';\n      this.ctx.fillRect(0, 0, width, height);\n      this.ctx.restore();\n\n      if (transparency) {\n        var transparentCanvas = this.cachedCanvases.getCanvas(\n          'transparent', width, height, true);\n        this.compositeCtx = this.ctx;\n        this.transparentCanvas = transparentCanvas.canvas;\n        this.ctx = transparentCanvas.context;\n        this.ctx.save();\n        // The transform can be applied before rendering, transferring it to\n        // the new canvas.\n        this.ctx.transform.apply(this.ctx,\n                                 this.compositeCtx.mozCurrentTransform);\n      }\n\n      this.ctx.save();\n      resetCtxToDefault(this.ctx);\n      if (transform) {\n        this.ctx.transform.apply(this.ctx, transform);\n      }\n      this.ctx.transform.apply(this.ctx, viewport.transform);\n\n      this.baseTransform = this.ctx.mozCurrentTransform.slice();\n\n      if (this.imageLayer) {\n        this.imageLayer.beginLayout();\n      }\n    },\n\n    executeOperatorList: function CanvasGraphics_executeOperatorList(\n                                    operatorList,\n                                    executionStartIdx, continueCallback,\n                                    stepper) {\n      var argsArray = operatorList.argsArray;\n      var fnArray = operatorList.fnArray;\n      var i = executionStartIdx || 0;\n      var argsArrayLen = argsArray.length;\n\n      // Sometimes the OperatorList to execute is empty.\n      if (argsArrayLen === i) {\n        return i;\n      }\n\n      var chunkOperations = (argsArrayLen - i > EXECUTION_STEPS &&\n                             typeof continueCallback === 'function');\n      var endTime = chunkOperations ? Date.now() + EXECUTION_TIME : 0;\n      var steps = 0;\n\n      var commonObjs = this.commonObjs;\n      var objs = this.objs;\n      var fnId;\n\n      while (true) {\n        if (stepper !== undefined && i === stepper.nextBreakPoint) {\n          stepper.breakIt(i, continueCallback);\n          return i;\n        }\n\n        fnId = fnArray[i];\n\n        if (fnId !== OPS.dependency) {\n          this[fnId].apply(this, argsArray[i]);\n        } else {\n          var deps = argsArray[i];\n          for (var n = 0, nn = deps.length; n < nn; n++) {\n            var depObjId = deps[n];\n            var common = depObjId[0] === 'g' && depObjId[1] === '_';\n            var objsPool = common ? commonObjs : objs;\n\n            // If the promise isn't resolved yet, add the continueCallback\n            // to the promise and bail out.\n            if (!objsPool.has(depObjId)) {\n              objsPool.get(depObjId, continueCallback);\n              return i;\n            }\n          }\n        }\n\n        i++;\n\n        // If the entire operatorList was executed, stop as were done.\n        if (i === argsArrayLen) {\n          return i;\n        }\n\n        // If the execution took longer then a certain amount of time and\n        // `continueCallback` is specified, interrupt the execution.\n        if (chunkOperations && ++steps > EXECUTION_STEPS) {\n          if (Date.now() > endTime) {\n            continueCallback();\n            return i;\n          }\n          steps = 0;\n        }\n\n        // If the operatorList isn't executed completely yet OR the execution\n        // time was short enough, do another execution round.\n      }\n    },\n\n    endDrawing: function CanvasGraphics_endDrawing() {\n      // Finishing all opened operations such as SMask group painting.\n      if (this.current.activeSMask !== null) {\n        this.endSMaskGroup();\n      }\n\n      this.ctx.restore();\n\n      if (this.transparentCanvas) {\n        this.ctx = this.compositeCtx;\n        this.ctx.save();\n        this.ctx.setTransform(1, 0, 0, 1, 0, 0); // Avoid apply transform twice\n        this.ctx.drawImage(this.transparentCanvas, 0, 0);\n        this.ctx.restore();\n        this.transparentCanvas = null;\n      }\n\n      this.cachedCanvases.clear();\n      this.webGLContext.clear();\n\n      if (this.imageLayer) {\n        this.imageLayer.endLayout();\n      }\n    },\n\n    // Graphics state\n    setLineWidth: function CanvasGraphics_setLineWidth(width) {\n      this.current.lineWidth = width;\n      this.ctx.lineWidth = width;\n    },\n    setLineCap: function CanvasGraphics_setLineCap(style) {\n      this.ctx.lineCap = LINE_CAP_STYLES[style];\n    },\n    setLineJoin: function CanvasGraphics_setLineJoin(style) {\n      this.ctx.lineJoin = LINE_JOIN_STYLES[style];\n    },\n    setMiterLimit: function CanvasGraphics_setMiterLimit(limit) {\n      this.ctx.miterLimit = limit;\n    },\n    setDash: function CanvasGraphics_setDash(dashArray, dashPhase) {\n      var ctx = this.ctx;\n      if (ctx.setLineDash !== undefined) {\n        ctx.setLineDash(dashArray);\n        ctx.lineDashOffset = dashPhase;\n      }\n    },\n    setRenderingIntent: function CanvasGraphics_setRenderingIntent(intent) {\n      // Maybe if we one day fully support color spaces this will be important\n      // for now we can ignore.\n      // TODO set rendering intent?\n    },\n    setFlatness: function CanvasGraphics_setFlatness(flatness) {\n      // There's no way to control this with canvas, but we can safely ignore.\n      // TODO set flatness?\n    },\n    setGState: function CanvasGraphics_setGState(states) {\n      for (var i = 0, ii = states.length; i < ii; i++) {\n        var state = states[i];\n        var key = state[0];\n        var value = state[1];\n\n        switch (key) {\n          case 'LW':\n            this.setLineWidth(value);\n            break;\n          case 'LC':\n            this.setLineCap(value);\n            break;\n          case 'LJ':\n            this.setLineJoin(value);\n            break;\n          case 'ML':\n            this.setMiterLimit(value);\n            break;\n          case 'D':\n            this.setDash(value[0], value[1]);\n            break;\n          case 'RI':\n            this.setRenderingIntent(value);\n            break;\n          case 'FL':\n            this.setFlatness(value);\n            break;\n          case 'Font':\n            this.setFont(value[0], value[1]);\n            break;\n          case 'CA':\n            this.current.strokeAlpha = state[1];\n            break;\n          case 'ca':\n            this.current.fillAlpha = state[1];\n            this.ctx.globalAlpha = state[1];\n            break;\n          case 'BM':\n            this.ctx.globalCompositeOperation = value;\n            break;\n          case 'SMask':\n            if (this.current.activeSMask) {\n              // If SMask is currrenly used, it needs to be suspended or\n              // finished. Suspend only makes sense when at least one save()\n              // was performed and state needs to be reverted on restore().\n              if (this.stateStack.length > 0 &&\n                  (this.stateStack[this.stateStack.length - 1].activeSMask ===\n                   this.current.activeSMask)) {\n                this.suspendSMaskGroup();\n              } else {\n                this.endSMaskGroup();\n              }\n            }\n            this.current.activeSMask = value ? this.tempSMask : null;\n            if (this.current.activeSMask) {\n              this.beginSMaskGroup();\n            }\n            this.tempSMask = null;\n            break;\n        }\n      }\n    },\n    beginSMaskGroup: function CanvasGraphics_beginSMaskGroup() {\n\n      var activeSMask = this.current.activeSMask;\n      var drawnWidth = activeSMask.canvas.width;\n      var drawnHeight = activeSMask.canvas.height;\n      var cacheId = 'smaskGroupAt' + this.groupLevel;\n      var scratchCanvas = this.cachedCanvases.getCanvas(\n        cacheId, drawnWidth, drawnHeight, true);\n\n      var currentCtx = this.ctx;\n      var currentTransform = currentCtx.mozCurrentTransform;\n      this.ctx.save();\n\n      var groupCtx = scratchCanvas.context;\n      groupCtx.scale(1 / activeSMask.scaleX, 1 / activeSMask.scaleY);\n      groupCtx.translate(-activeSMask.offsetX, -activeSMask.offsetY);\n      groupCtx.transform.apply(groupCtx, currentTransform);\n\n      activeSMask.startTransformInverse = groupCtx.mozCurrentTransformInverse;\n\n      copyCtxState(currentCtx, groupCtx);\n      this.ctx = groupCtx;\n      this.setGState([\n        ['BM', 'source-over'],\n        ['ca', 1],\n        ['CA', 1]\n      ]);\n      this.groupStack.push(currentCtx);\n      this.groupLevel++;\n    },\n    suspendSMaskGroup: function CanvasGraphics_endSMaskGroup() {\n      // Similar to endSMaskGroup, the intermediate canvas has to be composed\n      // and future ctx state restored.\n      var groupCtx = this.ctx;\n      this.groupLevel--;\n      this.ctx = this.groupStack.pop();\n\n      composeSMask(this.ctx, this.current.activeSMask, groupCtx,\n                   this.webGLContext);\n      this.ctx.restore();\n      this.ctx.save(); // save is needed since SMask will be resumed.\n      copyCtxState(groupCtx, this.ctx);\n\n      // Saving state for resuming.\n      this.current.resumeSMaskCtx = groupCtx;\n      // Transform was changed in the SMask canvas, reflecting this change on\n      // this.ctx.\n      var deltaTransform = Util.transform(\n        this.current.activeSMask.startTransformInverse,\n        groupCtx.mozCurrentTransform);\n      this.ctx.transform.apply(this.ctx, deltaTransform);\n\n      // SMask was composed, the results at the groupCtx can be cleared.\n      groupCtx.save();\n      groupCtx.setTransform(1, 0, 0, 1, 0, 0);\n      groupCtx.clearRect(0, 0, groupCtx.canvas.width, groupCtx.canvas.height);\n      groupCtx.restore();\n    },\n    resumeSMaskGroup: function CanvasGraphics_endSMaskGroup() {\n      // Resuming state saved by suspendSMaskGroup. We don't need to restore\n      // any groupCtx state since restore() command (the only caller) will do\n      // that for us. See also beginSMaskGroup.\n      var groupCtx = this.current.resumeSMaskCtx;\n      var currentCtx = this.ctx;\n      this.ctx = groupCtx;\n      this.groupStack.push(currentCtx);\n      this.groupLevel++;\n    },\n    endSMaskGroup: function CanvasGraphics_endSMaskGroup() {\n      var groupCtx = this.ctx;\n      this.groupLevel--;\n      this.ctx = this.groupStack.pop();\n\n      composeSMask(this.ctx, this.current.activeSMask, groupCtx,\n                   this.webGLContext);\n      this.ctx.restore();\n      copyCtxState(groupCtx, this.ctx);\n      // Transform was changed in the SMask canvas, reflecting this change on\n      // this.ctx.\n      var deltaTransform = Util.transform(\n        this.current.activeSMask.startTransformInverse,\n        groupCtx.mozCurrentTransform);\n      this.ctx.transform.apply(this.ctx, deltaTransform);\n    },\n    save: function CanvasGraphics_save() {\n      this.ctx.save();\n      var old = this.current;\n      this.stateStack.push(old);\n      this.current = old.clone();\n      this.current.resumeSMaskCtx = null;\n    },\n    restore: function CanvasGraphics_restore() {\n      // SMask was suspended, we just need to resume it.\n      if (this.current.resumeSMaskCtx) {\n        this.resumeSMaskGroup();\n      }\n      // SMask has to be finished once there is no states that are using the\n      // same SMask.\n      if (this.current.activeSMask !== null && (this.stateStack.length === 0 ||\n          this.stateStack[this.stateStack.length - 1].activeSMask !==\n          this.current.activeSMask)) {\n        this.endSMaskGroup();\n      }\n\n      if (this.stateStack.length !== 0) {\n        this.current = this.stateStack.pop();\n        this.ctx.restore();\n\n        // Ensure that the clipping path is reset (fixes issue6413.pdf).\n        this.pendingClip = null;\n\n        this._cachedGetSinglePixelWidth = null;\n      }\n    },\n    transform: function CanvasGraphics_transform(a, b, c, d, e, f) {\n      this.ctx.transform(a, b, c, d, e, f);\n\n      this._cachedGetSinglePixelWidth = null;\n    },\n\n    // Path\n    constructPath: function CanvasGraphics_constructPath(ops, args) {\n      var ctx = this.ctx;\n      var current = this.current;\n      var x = current.x, y = current.y;\n      for (var i = 0, j = 0, ii = ops.length; i < ii; i++) {\n        switch (ops[i] | 0) {\n          case OPS.rectangle:\n            x = args[j++];\n            y = args[j++];\n            var width = args[j++];\n            var height = args[j++];\n            if (width === 0) {\n              width = this.getSinglePixelWidth();\n            }\n            if (height === 0) {\n              height = this.getSinglePixelWidth();\n            }\n            var xw = x + width;\n            var yh = y + height;\n            this.ctx.moveTo(x, y);\n            this.ctx.lineTo(xw, y);\n            this.ctx.lineTo(xw, yh);\n            this.ctx.lineTo(x, yh);\n            this.ctx.lineTo(x, y);\n            this.ctx.closePath();\n            break;\n          case OPS.moveTo:\n            x = args[j++];\n            y = args[j++];\n            ctx.moveTo(x, y);\n            break;\n          case OPS.lineTo:\n            x = args[j++];\n            y = args[j++];\n            ctx.lineTo(x, y);\n            break;\n          case OPS.curveTo:\n            x = args[j + 4];\n            y = args[j + 5];\n            ctx.bezierCurveTo(args[j], args[j + 1], args[j + 2], args[j + 3],\n                              x, y);\n            j += 6;\n            break;\n          case OPS.curveTo2:\n            ctx.bezierCurveTo(x, y, args[j], args[j + 1],\n                              args[j + 2], args[j + 3]);\n            x = args[j + 2];\n            y = args[j + 3];\n            j += 4;\n            break;\n          case OPS.curveTo3:\n            x = args[j + 2];\n            y = args[j + 3];\n            ctx.bezierCurveTo(args[j], args[j + 1], x, y, x, y);\n            j += 4;\n            break;\n          case OPS.closePath:\n            ctx.closePath();\n            break;\n        }\n      }\n      current.setCurrentPoint(x, y);\n    },\n    closePath: function CanvasGraphics_closePath() {\n      this.ctx.closePath();\n    },\n    stroke: function CanvasGraphics_stroke(consumePath) {\n      consumePath = typeof consumePath !== 'undefined' ? consumePath : true;\n      var ctx = this.ctx;\n      var strokeColor = this.current.strokeColor;\n      // Prevent drawing too thin lines by enforcing a minimum line width.\n      ctx.lineWidth = Math.max(this.getSinglePixelWidth() * MIN_WIDTH_FACTOR,\n                               this.current.lineWidth);\n      // For stroke we want to temporarily change the global alpha to the\n      // stroking alpha.\n      ctx.globalAlpha = this.current.strokeAlpha;\n      if (strokeColor && strokeColor.hasOwnProperty('type') &&\n          strokeColor.type === 'Pattern') {\n        // for patterns, we transform to pattern space, calculate\n        // the pattern, call stroke, and restore to user space\n        ctx.save();\n        ctx.strokeStyle = strokeColor.getPattern(ctx, this);\n        ctx.stroke();\n        ctx.restore();\n      } else {\n        ctx.stroke();\n      }\n      if (consumePath) {\n        this.consumePath();\n      }\n      // Restore the global alpha to the fill alpha\n      ctx.globalAlpha = this.current.fillAlpha;\n    },\n    closeStroke: function CanvasGraphics_closeStroke() {\n      this.closePath();\n      this.stroke();\n    },\n    fill: function CanvasGraphics_fill(consumePath) {\n      consumePath = typeof consumePath !== 'undefined' ? consumePath : true;\n      var ctx = this.ctx;\n      var fillColor = this.current.fillColor;\n      var isPatternFill = this.current.patternFill;\n      var needRestore = false;\n\n      if (isPatternFill) {\n        ctx.save();\n        if (this.baseTransform) {\n          ctx.setTransform.apply(ctx, this.baseTransform);\n        }\n        ctx.fillStyle = fillColor.getPattern(ctx, this);\n        needRestore = true;\n      }\n\n      if (this.pendingEOFill) {\n        ctx.fill('evenodd');\n        this.pendingEOFill = false;\n      } else {\n        ctx.fill();\n      }\n\n      if (needRestore) {\n        ctx.restore();\n      }\n      if (consumePath) {\n        this.consumePath();\n      }\n    },\n    eoFill: function CanvasGraphics_eoFill() {\n      this.pendingEOFill = true;\n      this.fill();\n    },\n    fillStroke: function CanvasGraphics_fillStroke() {\n      this.fill(false);\n      this.stroke(false);\n\n      this.consumePath();\n    },\n    eoFillStroke: function CanvasGraphics_eoFillStroke() {\n      this.pendingEOFill = true;\n      this.fillStroke();\n    },\n    closeFillStroke: function CanvasGraphics_closeFillStroke() {\n      this.closePath();\n      this.fillStroke();\n    },\n    closeEOFillStroke: function CanvasGraphics_closeEOFillStroke() {\n      this.pendingEOFill = true;\n      this.closePath();\n      this.fillStroke();\n    },\n    endPath: function CanvasGraphics_endPath() {\n      this.consumePath();\n    },\n\n    // Clipping\n    clip: function CanvasGraphics_clip() {\n      this.pendingClip = NORMAL_CLIP;\n    },\n    eoClip: function CanvasGraphics_eoClip() {\n      this.pendingClip = EO_CLIP;\n    },\n\n    // Text\n    beginText: function CanvasGraphics_beginText() {\n      this.current.textMatrix = IDENTITY_MATRIX;\n      this.current.textMatrixScale = 1;\n      this.current.x = this.current.lineX = 0;\n      this.current.y = this.current.lineY = 0;\n    },\n    endText: function CanvasGraphics_endText() {\n      var paths = this.pendingTextPaths;\n      var ctx = this.ctx;\n      if (paths === undefined) {\n        ctx.beginPath();\n        return;\n      }\n\n      ctx.save();\n      ctx.beginPath();\n      for (var i = 0; i < paths.length; i++) {\n        var path = paths[i];\n        ctx.setTransform.apply(ctx, path.transform);\n        ctx.translate(path.x, path.y);\n        path.addToPath(ctx, path.fontSize);\n      }\n      ctx.restore();\n      ctx.clip();\n      ctx.beginPath();\n      delete this.pendingTextPaths;\n    },\n    setCharSpacing: function CanvasGraphics_setCharSpacing(spacing) {\n      this.current.charSpacing = spacing;\n    },\n    setWordSpacing: function CanvasGraphics_setWordSpacing(spacing) {\n      this.current.wordSpacing = spacing;\n    },\n    setHScale: function CanvasGraphics_setHScale(scale) {\n      this.current.textHScale = scale / 100;\n    },\n    setLeading: function CanvasGraphics_setLeading(leading) {\n      this.current.leading = -leading;\n    },\n    setFont: function CanvasGraphics_setFont(fontRefName, size) {\n      var fontObj = this.commonObjs.get(fontRefName);\n      var current = this.current;\n\n      if (!fontObj) {\n        throw new Error(`Can't find font for ${fontRefName}`);\n      }\n\n      current.fontMatrix = (fontObj.fontMatrix ?\n                            fontObj.fontMatrix : FONT_IDENTITY_MATRIX);\n\n      // A valid matrix needs all main diagonal elements to be non-zero\n      // This also ensures we bypass FF bugzilla bug #719844.\n      if (current.fontMatrix[0] === 0 ||\n          current.fontMatrix[3] === 0) {\n        warn('Invalid font matrix for font ' + fontRefName);\n      }\n\n      // The spec for Tf (setFont) says that 'size' specifies the font 'scale',\n      // and in some docs this can be negative (inverted x-y axes).\n      if (size < 0) {\n        size = -size;\n        current.fontDirection = -1;\n      } else {\n        current.fontDirection = 1;\n      }\n\n      this.current.font = fontObj;\n      this.current.fontSize = size;\n\n      if (fontObj.isType3Font) {\n        return; // we don't need ctx.font for Type3 fonts\n      }\n\n      var name = fontObj.loadedName || 'sans-serif';\n      var bold = fontObj.black ? '900' : (fontObj.bold ? 'bold' : 'normal');\n      var italic = fontObj.italic ? 'italic' : 'normal';\n      var typeface = `\"${name}\", ${fontObj.fallbackName}`;\n\n      // Some font backends cannot handle fonts below certain size.\n      // Keeping the font at minimal size and using the fontSizeScale to change\n      // the current transformation matrix before the fillText/strokeText.\n      // See https://bugzilla.mozilla.org/show_bug.cgi?id=726227\n      var browserFontSize = size < MIN_FONT_SIZE ? MIN_FONT_SIZE :\n                            size > MAX_FONT_SIZE ? MAX_FONT_SIZE : size;\n      this.current.fontSizeScale = size / browserFontSize;\n\n      this.ctx.font = `${italic} ${bold} ${browserFontSize}px ${typeface}`;\n    },\n    setTextRenderingMode: function CanvasGraphics_setTextRenderingMode(mode) {\n      this.current.textRenderingMode = mode;\n    },\n    setTextRise: function CanvasGraphics_setTextRise(rise) {\n      this.current.textRise = rise;\n    },\n    moveText: function CanvasGraphics_moveText(x, y) {\n      this.current.x = this.current.lineX += x;\n      this.current.y = this.current.lineY += y;\n    },\n    setLeadingMoveText: function CanvasGraphics_setLeadingMoveText(x, y) {\n      this.setLeading(-y);\n      this.moveText(x, y);\n    },\n    setTextMatrix: function CanvasGraphics_setTextMatrix(a, b, c, d, e, f) {\n      this.current.textMatrix = [a, b, c, d, e, f];\n      this.current.textMatrixScale = Math.sqrt(a * a + b * b);\n\n      this.current.x = this.current.lineX = 0;\n      this.current.y = this.current.lineY = 0;\n    },\n    nextLine: function CanvasGraphics_nextLine() {\n      this.moveText(0, this.current.leading);\n    },\n\n    paintChar(character, x, y, patternTransform) {\n      var ctx = this.ctx;\n      var current = this.current;\n      var font = current.font;\n      var textRenderingMode = current.textRenderingMode;\n      var fontSize = current.fontSize / current.fontSizeScale;\n      var fillStrokeMode = textRenderingMode &\n        TextRenderingMode.FILL_STROKE_MASK;\n      var isAddToPathSet = !!(textRenderingMode &\n        TextRenderingMode.ADD_TO_PATH_FLAG);\n      let patternFill = current.patternFill && font.data;\n\n      var addToPath;\n      if (font.disableFontFace || isAddToPathSet || patternFill) {\n        addToPath = font.getPathGenerator(this.commonObjs, character);\n      }\n\n      if (font.disableFontFace || patternFill) {\n        ctx.save();\n        ctx.translate(x, y);\n        ctx.beginPath();\n        addToPath(ctx, fontSize);\n        if (patternTransform) {\n          ctx.setTransform.apply(ctx, patternTransform);\n        }\n        if (fillStrokeMode === TextRenderingMode.FILL ||\n            fillStrokeMode === TextRenderingMode.FILL_STROKE) {\n          ctx.fill();\n        }\n        if (fillStrokeMode === TextRenderingMode.STROKE ||\n            fillStrokeMode === TextRenderingMode.FILL_STROKE) {\n          ctx.stroke();\n        }\n        ctx.restore();\n      } else {\n        if (fillStrokeMode === TextRenderingMode.FILL ||\n            fillStrokeMode === TextRenderingMode.FILL_STROKE) {\n          ctx.fillText(character, x, y);\n        }\n        if (fillStrokeMode === TextRenderingMode.STROKE ||\n            fillStrokeMode === TextRenderingMode.FILL_STROKE) {\n          ctx.strokeText(character, x, y);\n        }\n      }\n\n      if (isAddToPathSet) {\n        var paths = this.pendingTextPaths || (this.pendingTextPaths = []);\n        paths.push({\n          transform: ctx.mozCurrentTransform,\n          x,\n          y,\n          fontSize,\n          addToPath,\n        });\n      }\n    },\n\n    get isFontSubpixelAAEnabled() {\n      // Checks if anti-aliasing is enabled when scaled text is painted.\n      // On Windows GDI scaled fonts looks bad.\n      var ctx = this.canvasFactory.create(10, 10).context;\n      ctx.scale(1.5, 1);\n      ctx.fillText('I', 0, 10);\n      var data = ctx.getImageData(0, 0, 10, 10).data;\n      var enabled = false;\n      for (var i = 3; i < data.length; i += 4) {\n        if (data[i] > 0 && data[i] < 255) {\n          enabled = true;\n          break;\n        }\n      }\n      return shadow(this, 'isFontSubpixelAAEnabled', enabled);\n    },\n\n    showText: function CanvasGraphics_showText(glyphs) {\n      var current = this.current;\n      var font = current.font;\n      if (font.isType3Font) {\n        return this.showType3Text(glyphs);\n      }\n\n      var fontSize = current.fontSize;\n      if (fontSize === 0) {\n        return;\n      }\n\n      var ctx = this.ctx;\n      var fontSizeScale = current.fontSizeScale;\n      var charSpacing = current.charSpacing;\n      var wordSpacing = current.wordSpacing;\n      var fontDirection = current.fontDirection;\n      var textHScale = current.textHScale * fontDirection;\n      var glyphsLength = glyphs.length;\n      var vertical = font.vertical;\n      var spacingDir = vertical ? 1 : -1;\n      var defaultVMetrics = font.defaultVMetrics;\n      var widthAdvanceScale = fontSize * current.fontMatrix[0];\n\n      var simpleFillText =\n        current.textRenderingMode === TextRenderingMode.FILL &&\n        !font.disableFontFace && !current.patternFill;\n\n      ctx.save();\n      let patternTransform;\n      if (current.patternFill) {\n        // TODO: Patterns are not applied correctly to text if a non-embedded\n        // font is used. E.g. issue 8111 and ShowText-ShadingPattern.pdf.\n        ctx.save();\n        let pattern = current.fillColor.getPattern(ctx, this);\n        patternTransform = ctx.mozCurrentTransform;\n        ctx.restore();\n        ctx.fillStyle = pattern;\n      }\n      ctx.transform.apply(ctx, current.textMatrix);\n      ctx.translate(current.x, current.y + current.textRise);\n\n      if (fontDirection > 0) {\n        ctx.scale(textHScale, -1);\n      } else {\n        ctx.scale(textHScale, 1);\n      }\n\n      var lineWidth = current.lineWidth;\n      var scale = current.textMatrixScale;\n      if (scale === 0 || lineWidth === 0) {\n        var fillStrokeMode = current.textRenderingMode &\n          TextRenderingMode.FILL_STROKE_MASK;\n        if (fillStrokeMode === TextRenderingMode.STROKE ||\n            fillStrokeMode === TextRenderingMode.FILL_STROKE) {\n          this._cachedGetSinglePixelWidth = null;\n          lineWidth = this.getSinglePixelWidth() * MIN_WIDTH_FACTOR;\n        }\n      } else {\n        lineWidth /= scale;\n      }\n\n      if (fontSizeScale !== 1.0) {\n        ctx.scale(fontSizeScale, fontSizeScale);\n        lineWidth /= fontSizeScale;\n      }\n\n      ctx.lineWidth = lineWidth;\n\n      var x = 0, i;\n      for (i = 0; i < glyphsLength; ++i) {\n        var glyph = glyphs[i];\n        if (isNum(glyph)) {\n          x += spacingDir * glyph * fontSize / 1000;\n          continue;\n        }\n\n        var restoreNeeded = false;\n        var spacing = (glyph.isSpace ? wordSpacing : 0) + charSpacing;\n        var character = glyph.fontChar;\n        var accent = glyph.accent;\n        var scaledX, scaledY, scaledAccentX, scaledAccentY;\n        var width = glyph.width;\n        if (vertical) {\n          var vmetric, vx, vy;\n          vmetric = glyph.vmetric || defaultVMetrics;\n          vx = glyph.vmetric ? vmetric[1] : width * 0.5;\n          vx = -vx * widthAdvanceScale;\n          vy = vmetric[2] * widthAdvanceScale;\n\n          width = vmetric ? -vmetric[0] : width;\n          scaledX = vx / fontSizeScale;\n          scaledY = (x + vy) / fontSizeScale;\n        } else {\n          scaledX = x / fontSizeScale;\n          scaledY = 0;\n        }\n\n        if (font.remeasure && width > 0) {\n          // Some standard fonts may not have the exact width: rescale per\n          // character if measured width is greater than expected glyph width\n          // and subpixel-aa is enabled, otherwise just center the glyph.\n          var measuredWidth = ctx.measureText(character).width * 1000 /\n            fontSize * fontSizeScale;\n          if (width < measuredWidth && this.isFontSubpixelAAEnabled) {\n            var characterScaleX = width / measuredWidth;\n            restoreNeeded = true;\n            ctx.save();\n            ctx.scale(characterScaleX, 1);\n            scaledX /= characterScaleX;\n          } else if (width !== measuredWidth) {\n            scaledX += (width - measuredWidth) / 2000 *\n              fontSize / fontSizeScale;\n          }\n        }\n\n        // Only attempt to draw the glyph if it is actually in the embedded font\n        // file or if there isn't a font file so the fallback font is shown.\n        if (glyph.isInFont || font.missingFile) {\n          if (simpleFillText && !accent) {\n            // common case\n            ctx.fillText(character, scaledX, scaledY);\n          } else {\n            this.paintChar(character, scaledX, scaledY, patternTransform);\n            if (accent) {\n              scaledAccentX = scaledX + accent.offset.x / fontSizeScale;\n              scaledAccentY = scaledY - accent.offset.y / fontSizeScale;\n              this.paintChar(accent.fontChar, scaledAccentX, scaledAccentY,\n                             patternTransform);\n            }\n          }\n        }\n\n        var charWidth = width * widthAdvanceScale + spacing * fontDirection;\n        x += charWidth;\n\n        if (restoreNeeded) {\n          ctx.restore();\n        }\n      }\n      if (vertical) {\n        current.y -= x * textHScale;\n      } else {\n        current.x += x * textHScale;\n      }\n      ctx.restore();\n    },\n\n    showType3Text: function CanvasGraphics_showType3Text(glyphs) {\n      // Type3 fonts - each glyph is a \"mini-PDF\"\n      var ctx = this.ctx;\n      var current = this.current;\n      var font = current.font;\n      var fontSize = current.fontSize;\n      var fontDirection = current.fontDirection;\n      var spacingDir = font.vertical ? 1 : -1;\n      var charSpacing = current.charSpacing;\n      var wordSpacing = current.wordSpacing;\n      var textHScale = current.textHScale * fontDirection;\n      var fontMatrix = current.fontMatrix || FONT_IDENTITY_MATRIX;\n      var glyphsLength = glyphs.length;\n      var isTextInvisible =\n        current.textRenderingMode === TextRenderingMode.INVISIBLE;\n      var i, glyph, width, spacingLength;\n\n      if (isTextInvisible || fontSize === 0) {\n        return;\n      }\n      this._cachedGetSinglePixelWidth = null;\n\n      ctx.save();\n      ctx.transform.apply(ctx, current.textMatrix);\n      ctx.translate(current.x, current.y);\n\n      ctx.scale(textHScale, fontDirection);\n\n      for (i = 0; i < glyphsLength; ++i) {\n        glyph = glyphs[i];\n        if (isNum(glyph)) {\n          spacingLength = spacingDir * glyph * fontSize / 1000;\n          this.ctx.translate(spacingLength, 0);\n          current.x += spacingLength * textHScale;\n          continue;\n        }\n\n        var spacing = (glyph.isSpace ? wordSpacing : 0) + charSpacing;\n        var operatorList = font.charProcOperatorList[glyph.operatorListId];\n        if (!operatorList) {\n          warn(`Type3 character \"${glyph.operatorListId}\" is not available.`);\n          continue;\n        }\n        this.processingType3 = glyph;\n        this.save();\n        ctx.scale(fontSize, fontSize);\n        ctx.transform.apply(ctx, fontMatrix);\n        this.executeOperatorList(operatorList);\n        this.restore();\n\n        var transformed = Util.applyTransform([glyph.width, 0], fontMatrix);\n        width = transformed[0] * fontSize + spacing;\n\n        ctx.translate(width, 0);\n        current.x += width * textHScale;\n      }\n      ctx.restore();\n      this.processingType3 = null;\n    },\n\n    // Type3 fonts\n    setCharWidth: function CanvasGraphics_setCharWidth(xWidth, yWidth) {\n      // We can safely ignore this since the width should be the same\n      // as the width in the Widths array.\n    },\n    setCharWidthAndBounds: function CanvasGraphics_setCharWidthAndBounds(xWidth,\n                                                                        yWidth,\n                                                                        llx,\n                                                                        lly,\n                                                                        urx,\n                                                                        ury) {\n      // TODO According to the spec we're also suppose to ignore any operators\n      // that set color or include images while processing this type3 font.\n      this.ctx.rect(llx, lly, urx - llx, ury - lly);\n      this.clip();\n      this.endPath();\n    },\n\n    // Color\n    getColorN_Pattern: function CanvasGraphics_getColorN_Pattern(IR) {\n      var pattern;\n      if (IR[0] === 'TilingPattern') {\n        var color = IR[1];\n        var baseTransform = this.baseTransform ||\n                            this.ctx.mozCurrentTransform.slice();\n        var canvasGraphicsFactory = {\n          createCanvasGraphics: (ctx) => {\n            return new CanvasGraphics(ctx, this.commonObjs, this.objs,\n                                      this.canvasFactory, this.webGLContext);\n          },\n        };\n        pattern = new TilingPattern(IR, color, this.ctx, canvasGraphicsFactory,\n                                    baseTransform);\n      } else {\n        pattern = getShadingPatternFromIR(IR);\n      }\n      return pattern;\n    },\n    setStrokeColorN: function CanvasGraphics_setStrokeColorN() {\n      this.current.strokeColor = this.getColorN_Pattern(arguments);\n    },\n    setFillColorN: function CanvasGraphics_setFillColorN() {\n      this.current.fillColor = this.getColorN_Pattern(arguments);\n      this.current.patternFill = true;\n    },\n    setStrokeRGBColor: function CanvasGraphics_setStrokeRGBColor(r, g, b) {\n      var color = Util.makeCssRgb(r, g, b);\n      this.ctx.strokeStyle = color;\n      this.current.strokeColor = color;\n    },\n    setFillRGBColor: function CanvasGraphics_setFillRGBColor(r, g, b) {\n      var color = Util.makeCssRgb(r, g, b);\n      this.ctx.fillStyle = color;\n      this.current.fillColor = color;\n      this.current.patternFill = false;\n    },\n\n    shadingFill: function CanvasGraphics_shadingFill(patternIR) {\n      var ctx = this.ctx;\n\n      this.save();\n      var pattern = getShadingPatternFromIR(patternIR);\n      ctx.fillStyle = pattern.getPattern(ctx, this, true);\n\n      var inv = ctx.mozCurrentTransformInverse;\n      if (inv) {\n        var canvas = ctx.canvas;\n        var width = canvas.width;\n        var height = canvas.height;\n\n        var bl = Util.applyTransform([0, 0], inv);\n        var br = Util.applyTransform([0, height], inv);\n        var ul = Util.applyTransform([width, 0], inv);\n        var ur = Util.applyTransform([width, height], inv);\n\n        var x0 = Math.min(bl[0], br[0], ul[0], ur[0]);\n        var y0 = Math.min(bl[1], br[1], ul[1], ur[1]);\n        var x1 = Math.max(bl[0], br[0], ul[0], ur[0]);\n        var y1 = Math.max(bl[1], br[1], ul[1], ur[1]);\n\n        this.ctx.fillRect(x0, y0, x1 - x0, y1 - y0);\n      } else {\n        // HACK to draw the gradient onto an infinite rectangle.\n        // PDF gradients are drawn across the entire image while\n        // Canvas only allows gradients to be drawn in a rectangle\n        // The following bug should allow us to remove this.\n        // https://bugzilla.mozilla.org/show_bug.cgi?id=664884\n\n        this.ctx.fillRect(-1e10, -1e10, 2e10, 2e10);\n      }\n\n      this.restore();\n    },\n\n    // Images\n    beginInlineImage: function CanvasGraphics_beginInlineImage() {\n      unreachable('Should not call beginInlineImage');\n    },\n    beginImageData: function CanvasGraphics_beginImageData() {\n      unreachable('Should not call beginImageData');\n    },\n\n    paintFormXObjectBegin: function CanvasGraphics_paintFormXObjectBegin(matrix,\n                                                                        bbox) {\n      this.save();\n      this.baseTransformStack.push(this.baseTransform);\n\n      if (Array.isArray(matrix) && matrix.length === 6) {\n        this.transform.apply(this, matrix);\n      }\n\n      this.baseTransform = this.ctx.mozCurrentTransform;\n\n      if (bbox) {\n        var width = bbox[2] - bbox[0];\n        var height = bbox[3] - bbox[1];\n        this.ctx.rect(bbox[0], bbox[1], width, height);\n        this.clip();\n        this.endPath();\n      }\n    },\n\n    paintFormXObjectEnd: function CanvasGraphics_paintFormXObjectEnd() {\n      this.restore();\n      this.baseTransform = this.baseTransformStack.pop();\n    },\n\n    beginGroup: function CanvasGraphics_beginGroup(group) {\n      this.save();\n      var currentCtx = this.ctx;\n      // TODO non-isolated groups - according to Rik at adobe non-isolated\n      // group results aren't usually that different and they even have tools\n      // that ignore this setting. Notes from Rik on implementing:\n      // - When you encounter an transparency group, create a new canvas with\n      // the dimensions of the bbox\n      // - copy the content from the previous canvas to the new canvas\n      // - draw as usual\n      // - remove the backdrop alpha:\n      // alphaNew = 1 - (1 - alpha)/(1 - alphaBackdrop) with 'alpha' the alpha\n      // value of your transparency group and 'alphaBackdrop' the alpha of the\n      // backdrop\n      // - remove background color:\n      // colorNew = color - alphaNew *colorBackdrop /(1 - alphaNew)\n      if (!group.isolated) {\n        info('TODO: Support non-isolated groups.');\n      }\n\n      // TODO knockout - supposedly possible with the clever use of compositing\n      // modes.\n      if (group.knockout) {\n        warn('Knockout groups not supported.');\n      }\n\n      var currentTransform = currentCtx.mozCurrentTransform;\n      if (group.matrix) {\n        currentCtx.transform.apply(currentCtx, group.matrix);\n      }\n      if (!group.bbox) {\n        throw new Error('Bounding box is required.');\n      }\n\n      // Based on the current transform figure out how big the bounding box\n      // will actually be.\n      var bounds = Util.getAxialAlignedBoundingBox(\n                    group.bbox,\n                    currentCtx.mozCurrentTransform);\n      // Clip the bounding box to the current canvas.\n      var canvasBounds = [0,\n                          0,\n                          currentCtx.canvas.width,\n                          currentCtx.canvas.height];\n      bounds = Util.intersect(bounds, canvasBounds) || [0, 0, 0, 0];\n      // Use ceil in case we're between sizes so we don't create canvas that is\n      // too small and make the canvas at least 1x1 pixels.\n      var offsetX = Math.floor(bounds[0]);\n      var offsetY = Math.floor(bounds[1]);\n      var drawnWidth = Math.max(Math.ceil(bounds[2]) - offsetX, 1);\n      var drawnHeight = Math.max(Math.ceil(bounds[3]) - offsetY, 1);\n      var scaleX = 1, scaleY = 1;\n      if (drawnWidth > MAX_GROUP_SIZE) {\n        scaleX = drawnWidth / MAX_GROUP_SIZE;\n        drawnWidth = MAX_GROUP_SIZE;\n      }\n      if (drawnHeight > MAX_GROUP_SIZE) {\n        scaleY = drawnHeight / MAX_GROUP_SIZE;\n        drawnHeight = MAX_GROUP_SIZE;\n      }\n\n      var cacheId = 'groupAt' + this.groupLevel;\n      if (group.smask) {\n        // Using two cache entries is case if masks are used one after another.\n        cacheId += '_smask_' + ((this.smaskCounter++) % 2);\n      }\n      var scratchCanvas = this.cachedCanvases.getCanvas(\n        cacheId, drawnWidth, drawnHeight, true);\n      var groupCtx = scratchCanvas.context;\n\n      // Since we created a new canvas that is just the size of the bounding box\n      // we have to translate the group ctx.\n      groupCtx.scale(1 / scaleX, 1 / scaleY);\n      groupCtx.translate(-offsetX, -offsetY);\n      groupCtx.transform.apply(groupCtx, currentTransform);\n\n      if (group.smask) {\n        // Saving state and cached mask to be used in setGState.\n        this.smaskStack.push({\n          canvas: scratchCanvas.canvas,\n          context: groupCtx,\n          offsetX,\n          offsetY,\n          scaleX,\n          scaleY,\n          subtype: group.smask.subtype,\n          backdrop: group.smask.backdrop,\n          transferMap: group.smask.transferMap || null,\n          startTransformInverse: null, // used during suspend operation\n        });\n      } else {\n        // Setup the current ctx so when the group is popped we draw it at the\n        // right location.\n        currentCtx.setTransform(1, 0, 0, 1, 0, 0);\n        currentCtx.translate(offsetX, offsetY);\n        currentCtx.scale(scaleX, scaleY);\n      }\n      // The transparency group inherits all off the current graphics state\n      // except the blend mode, soft mask, and alpha constants.\n      copyCtxState(currentCtx, groupCtx);\n      this.ctx = groupCtx;\n      this.setGState([\n        ['BM', 'source-over'],\n        ['ca', 1],\n        ['CA', 1]\n      ]);\n      this.groupStack.push(currentCtx);\n      this.groupLevel++;\n\n      // Reseting mask state, masks will be applied on restore of the group.\n      this.current.activeSMask = null;\n    },\n\n    endGroup: function CanvasGraphics_endGroup(group) {\n      this.groupLevel--;\n      var groupCtx = this.ctx;\n      this.ctx = this.groupStack.pop();\n      // Turn off image smoothing to avoid sub pixel interpolation which can\n      // look kind of blurry for some pdfs.\n      if (this.ctx.imageSmoothingEnabled !== undefined) {\n        this.ctx.imageSmoothingEnabled = false;\n      } else {\n        this.ctx.mozImageSmoothingEnabled = false;\n      }\n      if (group.smask) {\n        this.tempSMask = this.smaskStack.pop();\n      } else {\n        this.ctx.drawImage(groupCtx.canvas, 0, 0);\n      }\n      this.restore();\n    },\n\n    beginAnnotations: function CanvasGraphics_beginAnnotations() {\n      this.save();\n      if (this.baseTransform) {\n        this.ctx.setTransform.apply(this.ctx, this.baseTransform);\n      }\n    },\n\n    endAnnotations: function CanvasGraphics_endAnnotations() {\n      this.restore();\n    },\n\n    beginAnnotation: function CanvasGraphics_beginAnnotation(rect, transform,\n                                                             matrix) {\n      this.save();\n      resetCtxToDefault(this.ctx);\n      this.current = new CanvasExtraState();\n\n      if (Array.isArray(rect) && rect.length === 4) {\n        var width = rect[2] - rect[0];\n        var height = rect[3] - rect[1];\n        this.ctx.rect(rect[0], rect[1], width, height);\n        this.clip();\n        this.endPath();\n      }\n\n      this.transform.apply(this, transform);\n      this.transform.apply(this, matrix);\n    },\n\n    endAnnotation: function CanvasGraphics_endAnnotation() {\n      this.restore();\n    },\n\n    paintJpegXObject: function CanvasGraphics_paintJpegXObject(objId, w, h) {\n      var domImage = this.objs.get(objId);\n      if (!domImage) {\n        warn('Dependent image isn\\'t ready yet');\n        return;\n      }\n\n      this.save();\n\n      var ctx = this.ctx;\n      // scale the image to the unit square\n      ctx.scale(1 / w, -1 / h);\n\n      ctx.drawImage(domImage, 0, 0, domImage.width, domImage.height,\n                    0, -h, w, h);\n      if (this.imageLayer) {\n        var currentTransform = ctx.mozCurrentTransformInverse;\n        var position = this.getCanvasPosition(0, 0);\n        this.imageLayer.appendImage({\n          objId,\n          left: position[0],\n          top: position[1],\n          width: w / currentTransform[0],\n          height: h / currentTransform[3],\n        });\n      }\n      this.restore();\n    },\n\n    paintImageMaskXObject: function CanvasGraphics_paintImageMaskXObject(img) {\n      var ctx = this.ctx;\n      var width = img.width, height = img.height;\n      var fillColor = this.current.fillColor;\n      var isPatternFill = this.current.patternFill;\n\n      var glyph = this.processingType3;\n\n      if (COMPILE_TYPE3_GLYPHS && glyph && glyph.compiled === undefined) {\n        if (width <= MAX_SIZE_TO_COMPILE && height <= MAX_SIZE_TO_COMPILE) {\n          glyph.compiled =\n            compileType3Glyph({ data: img.data, width, height, });\n        } else {\n          glyph.compiled = null;\n        }\n      }\n\n      if (glyph && glyph.compiled) {\n        glyph.compiled(ctx);\n        return;\n      }\n\n      var maskCanvas = this.cachedCanvases.getCanvas('maskCanvas',\n                                                     width, height);\n      var maskCtx = maskCanvas.context;\n      maskCtx.save();\n\n      putBinaryImageMask(maskCtx, img);\n\n      maskCtx.globalCompositeOperation = 'source-in';\n\n      maskCtx.fillStyle = isPatternFill ?\n                          fillColor.getPattern(maskCtx, this) : fillColor;\n      maskCtx.fillRect(0, 0, width, height);\n\n      maskCtx.restore();\n\n      this.paintInlineImageXObject(maskCanvas.canvas);\n    },\n\n    paintImageMaskXObjectRepeat:\n      function CanvasGraphics_paintImageMaskXObjectRepeat(imgData, scaleX,\n                                                          scaleY, positions) {\n      var width = imgData.width;\n      var height = imgData.height;\n      var fillColor = this.current.fillColor;\n      var isPatternFill = this.current.patternFill;\n\n      var maskCanvas = this.cachedCanvases.getCanvas('maskCanvas',\n                                                     width, height);\n      var maskCtx = maskCanvas.context;\n      maskCtx.save();\n\n      putBinaryImageMask(maskCtx, imgData);\n\n      maskCtx.globalCompositeOperation = 'source-in';\n\n      maskCtx.fillStyle = isPatternFill ?\n                          fillColor.getPattern(maskCtx, this) : fillColor;\n      maskCtx.fillRect(0, 0, width, height);\n\n      maskCtx.restore();\n\n      var ctx = this.ctx;\n      for (var i = 0, ii = positions.length; i < ii; i += 2) {\n        ctx.save();\n        ctx.transform(scaleX, 0, 0, scaleY, positions[i], positions[i + 1]);\n        ctx.scale(1, -1);\n        ctx.drawImage(maskCanvas.canvas, 0, 0, width, height,\n          0, -1, 1, 1);\n        ctx.restore();\n      }\n    },\n\n    paintImageMaskXObjectGroup:\n      function CanvasGraphics_paintImageMaskXObjectGroup(images) {\n      var ctx = this.ctx;\n\n      var fillColor = this.current.fillColor;\n      var isPatternFill = this.current.patternFill;\n      for (var i = 0, ii = images.length; i < ii; i++) {\n        var image = images[i];\n        var width = image.width, height = image.height;\n\n        var maskCanvas = this.cachedCanvases.getCanvas('maskCanvas',\n                                                       width, height);\n        var maskCtx = maskCanvas.context;\n        maskCtx.save();\n\n        putBinaryImageMask(maskCtx, image);\n\n        maskCtx.globalCompositeOperation = 'source-in';\n\n        maskCtx.fillStyle = isPatternFill ?\n                            fillColor.getPattern(maskCtx, this) : fillColor;\n        maskCtx.fillRect(0, 0, width, height);\n\n        maskCtx.restore();\n\n        ctx.save();\n        ctx.transform.apply(ctx, image.transform);\n        ctx.scale(1, -1);\n        ctx.drawImage(maskCanvas.canvas, 0, 0, width, height,\n                      0, -1, 1, 1);\n        ctx.restore();\n      }\n    },\n\n    paintImageXObject: function CanvasGraphics_paintImageXObject(objId) {\n      var imgData = this.objs.get(objId);\n      if (!imgData) {\n        warn('Dependent image isn\\'t ready yet');\n        return;\n      }\n\n      this.paintInlineImageXObject(imgData);\n    },\n\n    paintImageXObjectRepeat:\n      function CanvasGraphics_paintImageXObjectRepeat(objId, scaleX, scaleY,\n                                                          positions) {\n      var imgData = this.objs.get(objId);\n      if (!imgData) {\n        warn('Dependent image isn\\'t ready yet');\n        return;\n      }\n\n      var width = imgData.width;\n      var height = imgData.height;\n      var map = [];\n      for (var i = 0, ii = positions.length; i < ii; i += 2) {\n        map.push({ transform: [scaleX, 0, 0, scaleY, positions[i],\n                   positions[i + 1]], x: 0, y: 0, w: width, h: height, });\n      }\n      this.paintInlineImageXObjectGroup(imgData, map);\n    },\n\n    paintInlineImageXObject:\n      function CanvasGraphics_paintInlineImageXObject(imgData) {\n      var width = imgData.width;\n      var height = imgData.height;\n      var ctx = this.ctx;\n\n      this.save();\n      // scale the image to the unit square\n      ctx.scale(1 / width, -1 / height);\n\n      var currentTransform = ctx.mozCurrentTransformInverse;\n      var a = currentTransform[0], b = currentTransform[1];\n      var widthScale = Math.max(Math.sqrt(a * a + b * b), 1);\n      var c = currentTransform[2], d = currentTransform[3];\n      var heightScale = Math.max(Math.sqrt(c * c + d * d), 1);\n\n      var imgToPaint, tmpCanvas;\n      // typeof check is needed due to node.js support, see issue #8489\n      if ((typeof HTMLElement === 'function' &&\n           imgData instanceof HTMLElement) || !imgData.data) {\n        imgToPaint = imgData;\n      } else {\n        tmpCanvas = this.cachedCanvases.getCanvas('inlineImage',\n                                                  width, height);\n        var tmpCtx = tmpCanvas.context;\n        putBinaryImageData(tmpCtx, imgData);\n        imgToPaint = tmpCanvas.canvas;\n      }\n\n      var paintWidth = width, paintHeight = height;\n      var tmpCanvasId = 'prescale1';\n      // Vertial or horizontal scaling shall not be more than 2 to not loose the\n      // pixels during drawImage operation, painting on the temporary canvas(es)\n      // that are twice smaller in size\n      while ((widthScale > 2 && paintWidth > 1) ||\n             (heightScale > 2 && paintHeight > 1)) {\n        var newWidth = paintWidth, newHeight = paintHeight;\n        if (widthScale > 2 && paintWidth > 1) {\n          newWidth = Math.ceil(paintWidth / 2);\n          widthScale /= paintWidth / newWidth;\n        }\n        if (heightScale > 2 && paintHeight > 1) {\n          newHeight = Math.ceil(paintHeight / 2);\n          heightScale /= paintHeight / newHeight;\n        }\n        tmpCanvas = this.cachedCanvases.getCanvas(tmpCanvasId,\n                                                  newWidth, newHeight);\n        tmpCtx = tmpCanvas.context;\n        tmpCtx.clearRect(0, 0, newWidth, newHeight);\n        tmpCtx.drawImage(imgToPaint, 0, 0, paintWidth, paintHeight,\n                                     0, 0, newWidth, newHeight);\n        imgToPaint = tmpCanvas.canvas;\n        paintWidth = newWidth;\n        paintHeight = newHeight;\n        tmpCanvasId = tmpCanvasId === 'prescale1' ? 'prescale2' : 'prescale1';\n      }\n      ctx.drawImage(imgToPaint, 0, 0, paintWidth, paintHeight,\n                                0, -height, width, height);\n\n      if (this.imageLayer) {\n        var position = this.getCanvasPosition(0, -height);\n        this.imageLayer.appendImage({\n          imgData,\n          left: position[0],\n          top: position[1],\n          width: width / currentTransform[0],\n          height: height / currentTransform[3],\n        });\n      }\n      this.restore();\n    },\n\n    paintInlineImageXObjectGroup:\n      function CanvasGraphics_paintInlineImageXObjectGroup(imgData, map) {\n      var ctx = this.ctx;\n      var w = imgData.width;\n      var h = imgData.height;\n\n      var tmpCanvas = this.cachedCanvases.getCanvas('inlineImage', w, h);\n      var tmpCtx = tmpCanvas.context;\n      putBinaryImageData(tmpCtx, imgData);\n\n      for (var i = 0, ii = map.length; i < ii; i++) {\n        var entry = map[i];\n        ctx.save();\n        ctx.transform.apply(ctx, entry.transform);\n        ctx.scale(1, -1);\n        ctx.drawImage(tmpCanvas.canvas, entry.x, entry.y, entry.w, entry.h,\n                      0, -1, 1, 1);\n        if (this.imageLayer) {\n          var position = this.getCanvasPosition(entry.x, entry.y);\n          this.imageLayer.appendImage({\n            imgData,\n            left: position[0],\n            top: position[1],\n            width: w,\n            height: h,\n          });\n        }\n        ctx.restore();\n      }\n    },\n\n    paintSolidColorImageMask:\n      function CanvasGraphics_paintSolidColorImageMask() {\n        this.ctx.fillRect(0, 0, 1, 1);\n    },\n\n    paintXObject: function CanvasGraphics_paintXObject() {\n      warn('Unsupported \\'paintXObject\\' command.');\n    },\n\n    // Marked content\n\n    markPoint: function CanvasGraphics_markPoint(tag) {\n      // TODO Marked content.\n    },\n    markPointProps: function CanvasGraphics_markPointProps(tag, properties) {\n      // TODO Marked content.\n    },\n    beginMarkedContent: function CanvasGraphics_beginMarkedContent(tag) {\n      // TODO Marked content.\n    },\n    beginMarkedContentProps: function CanvasGraphics_beginMarkedContentProps(\n                                        tag, properties) {\n      // TODO Marked content.\n    },\n    endMarkedContent: function CanvasGraphics_endMarkedContent() {\n      // TODO Marked content.\n    },\n\n    // Compatibility\n\n    beginCompat: function CanvasGraphics_beginCompat() {\n      // TODO ignore undefined operators (should we do that anyway?)\n    },\n    endCompat: function CanvasGraphics_endCompat() {\n      // TODO stop ignoring undefined operators\n    },\n\n    // Helper functions\n\n    consumePath: function CanvasGraphics_consumePath() {\n      var ctx = this.ctx;\n      if (this.pendingClip) {\n        if (this.pendingClip === EO_CLIP) {\n          ctx.clip('evenodd');\n        } else {\n          ctx.clip();\n        }\n        this.pendingClip = null;\n      }\n      ctx.beginPath();\n    },\n    getSinglePixelWidth(scale) {\n      if (this._cachedGetSinglePixelWidth === null) {\n        const inverse = this.ctx.mozCurrentTransformInverse;\n        // max of the current horizontal and vertical scale\n        this._cachedGetSinglePixelWidth = Math.sqrt(Math.max(\n          (inverse[0] * inverse[0] + inverse[1] * inverse[1]),\n          (inverse[2] * inverse[2] + inverse[3] * inverse[3])));\n      }\n      return this._cachedGetSinglePixelWidth;\n    },\n    getCanvasPosition: function CanvasGraphics_getCanvasPosition(x, y) {\n      var transform = this.ctx.mozCurrentTransform;\n      return [\n        transform[0] * x + transform[2] * y + transform[4],\n        transform[1] * x + transform[3] * y + transform[5]\n      ];\n    },\n  };\n\n  for (var op in OPS) {\n    CanvasGraphics.prototype[OPS[op]] = CanvasGraphics.prototype[op];\n  }\n\n  return CanvasGraphics;\n})();\n\nexport {\n  CanvasGraphics,\n};\n","/* Copyright 2014 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { FormatError, info, Util } from '../shared/util';\n\nvar ShadingIRs = {};\n\nShadingIRs.RadialAxial = {\n  fromIR: function RadialAxial_fromIR(raw) {\n    var type = raw[1];\n    var colorStops = raw[2];\n    var p0 = raw[3];\n    var p1 = raw[4];\n    var r0 = raw[5];\n    var r1 = raw[6];\n    return {\n      type: 'Pattern',\n      getPattern: function RadialAxial_getPattern(ctx) {\n        var grad;\n        if (type === 'axial') {\n          grad = ctx.createLinearGradient(p0[0], p0[1], p1[0], p1[1]);\n        } else if (type === 'radial') {\n          grad = ctx.createRadialGradient(p0[0], p0[1], r0, p1[0], p1[1], r1);\n        }\n\n        for (var i = 0, ii = colorStops.length; i < ii; ++i) {\n          var c = colorStops[i];\n          grad.addColorStop(c[0], c[1]);\n        }\n        return grad;\n      },\n    };\n  },\n};\n\nvar createMeshCanvas = (function createMeshCanvasClosure() {\n  function drawTriangle(data, context, p1, p2, p3, c1, c2, c3) {\n    // Very basic Gouraud-shaded triangle rasterization algorithm.\n    var coords = context.coords, colors = context.colors;\n    var bytes = data.data, rowSize = data.width * 4;\n    var tmp;\n    if (coords[p1 + 1] > coords[p2 + 1]) {\n      tmp = p1; p1 = p2; p2 = tmp; tmp = c1; c1 = c2; c2 = tmp;\n    }\n    if (coords[p2 + 1] > coords[p3 + 1]) {\n      tmp = p2; p2 = p3; p3 = tmp; tmp = c2; c2 = c3; c3 = tmp;\n    }\n    if (coords[p1 + 1] > coords[p2 + 1]) {\n      tmp = p1; p1 = p2; p2 = tmp; tmp = c1; c1 = c2; c2 = tmp;\n    }\n    var x1 = (coords[p1] + context.offsetX) * context.scaleX;\n    var y1 = (coords[p1 + 1] + context.offsetY) * context.scaleY;\n    var x2 = (coords[p2] + context.offsetX) * context.scaleX;\n    var y2 = (coords[p2 + 1] + context.offsetY) * context.scaleY;\n    var x3 = (coords[p3] + context.offsetX) * context.scaleX;\n    var y3 = (coords[p3 + 1] + context.offsetY) * context.scaleY;\n    if (y1 >= y3) {\n      return;\n    }\n    var c1r = colors[c1], c1g = colors[c1 + 1], c1b = colors[c1 + 2];\n    var c2r = colors[c2], c2g = colors[c2 + 1], c2b = colors[c2 + 2];\n    var c3r = colors[c3], c3g = colors[c3 + 1], c3b = colors[c3 + 2];\n\n    var minY = Math.round(y1), maxY = Math.round(y3);\n    var xa, car, cag, cab;\n    var xb, cbr, cbg, cbb;\n    var k;\n    for (var y = minY; y <= maxY; y++) {\n      if (y < y2) {\n        k = y < y1 ? 0 : y1 === y2 ? 1 : (y1 - y) / (y1 - y2);\n        xa = x1 - (x1 - x2) * k;\n        car = c1r - (c1r - c2r) * k;\n        cag = c1g - (c1g - c2g) * k;\n        cab = c1b - (c1b - c2b) * k;\n      } else {\n        k = y > y3 ? 1 : y2 === y3 ? 0 : (y2 - y) / (y2 - y3);\n        xa = x2 - (x2 - x3) * k;\n        car = c2r - (c2r - c3r) * k;\n        cag = c2g - (c2g - c3g) * k;\n        cab = c2b - (c2b - c3b) * k;\n      }\n      k = y < y1 ? 0 : y > y3 ? 1 : (y1 - y) / (y1 - y3);\n      xb = x1 - (x1 - x3) * k;\n      cbr = c1r - (c1r - c3r) * k;\n      cbg = c1g - (c1g - c3g) * k;\n      cbb = c1b - (c1b - c3b) * k;\n      var x1_ = Math.round(Math.min(xa, xb));\n      var x2_ = Math.round(Math.max(xa, xb));\n      var j = rowSize * y + x1_ * 4;\n      for (var x = x1_; x <= x2_; x++) {\n        k = (xa - x) / (xa - xb);\n        k = k < 0 ? 0 : k > 1 ? 1 : k;\n        bytes[j++] = (car - (car - cbr) * k) | 0;\n        bytes[j++] = (cag - (cag - cbg) * k) | 0;\n        bytes[j++] = (cab - (cab - cbb) * k) | 0;\n        bytes[j++] = 255;\n      }\n    }\n  }\n\n  function drawFigure(data, figure, context) {\n    var ps = figure.coords;\n    var cs = figure.colors;\n    var i, ii;\n    switch (figure.type) {\n      case 'lattice':\n        var verticesPerRow = figure.verticesPerRow;\n        var rows = Math.floor(ps.length / verticesPerRow) - 1;\n        var cols = verticesPerRow - 1;\n        for (i = 0; i < rows; i++) {\n          var q = i * verticesPerRow;\n          for (var j = 0; j < cols; j++, q++) {\n            drawTriangle(data, context,\n              ps[q], ps[q + 1], ps[q + verticesPerRow],\n              cs[q], cs[q + 1], cs[q + verticesPerRow]);\n            drawTriangle(data, context,\n              ps[q + verticesPerRow + 1], ps[q + 1], ps[q + verticesPerRow],\n              cs[q + verticesPerRow + 1], cs[q + 1], cs[q + verticesPerRow]);\n          }\n        }\n        break;\n      case 'triangles':\n        for (i = 0, ii = ps.length; i < ii; i += 3) {\n          drawTriangle(data, context,\n            ps[i], ps[i + 1], ps[i + 2],\n            cs[i], cs[i + 1], cs[i + 2]);\n        }\n        break;\n      default:\n        throw new Error('illegal figure');\n    }\n  }\n\n  function createMeshCanvas(bounds, combinesScale, coords, colors, figures,\n                            backgroundColor, cachedCanvases, webGLContext) {\n    // we will increase scale on some weird factor to let antialiasing take\n    // care of \"rough\" edges\n    var EXPECTED_SCALE = 1.1;\n    // MAX_PATTERN_SIZE is used to avoid OOM situation.\n    var MAX_PATTERN_SIZE = 3000; // 10in @ 300dpi shall be enough\n    // We need to keep transparent border around our pattern for fill():\n    // createPattern with 'no-repeat' will bleed edges across entire area.\n    var BORDER_SIZE = 2;\n\n    var offsetX = Math.floor(bounds[0]);\n    var offsetY = Math.floor(bounds[1]);\n    var boundsWidth = Math.ceil(bounds[2]) - offsetX;\n    var boundsHeight = Math.ceil(bounds[3]) - offsetY;\n\n    var width = Math.min(Math.ceil(Math.abs(boundsWidth * combinesScale[0] *\n      EXPECTED_SCALE)), MAX_PATTERN_SIZE);\n    var height = Math.min(Math.ceil(Math.abs(boundsHeight * combinesScale[1] *\n      EXPECTED_SCALE)), MAX_PATTERN_SIZE);\n    var scaleX = boundsWidth / width;\n    var scaleY = boundsHeight / height;\n\n    var context = {\n      coords,\n      colors,\n      offsetX: -offsetX,\n      offsetY: -offsetY,\n      scaleX: 1 / scaleX,\n      scaleY: 1 / scaleY,\n    };\n\n    var paddedWidth = width + BORDER_SIZE * 2;\n    var paddedHeight = height + BORDER_SIZE * 2;\n\n    var canvas, tmpCanvas, i, ii;\n    if (webGLContext.isEnabled) {\n      canvas = webGLContext.drawFigures({\n        width,\n        height,\n        backgroundColor,\n        figures,\n        context,\n      });\n      // https://bugzilla.mozilla.org/show_bug.cgi?id=972126\n      tmpCanvas = cachedCanvases.getCanvas('mesh', paddedWidth, paddedHeight,\n                                           false);\n      tmpCanvas.context.drawImage(canvas, BORDER_SIZE, BORDER_SIZE);\n      canvas = tmpCanvas.canvas;\n    } else {\n      tmpCanvas = cachedCanvases.getCanvas('mesh', paddedWidth, paddedHeight,\n                                           false);\n      var tmpCtx = tmpCanvas.context;\n\n      var data = tmpCtx.createImageData(width, height);\n      if (backgroundColor) {\n        var bytes = data.data;\n        for (i = 0, ii = bytes.length; i < ii; i += 4) {\n          bytes[i] = backgroundColor[0];\n          bytes[i + 1] = backgroundColor[1];\n          bytes[i + 2] = backgroundColor[2];\n          bytes[i + 3] = 255;\n        }\n      }\n      for (i = 0; i < figures.length; i++) {\n        drawFigure(data, figures[i], context);\n      }\n      tmpCtx.putImageData(data, BORDER_SIZE, BORDER_SIZE);\n      canvas = tmpCanvas.canvas;\n    }\n\n    return {\n      canvas,\n      offsetX: offsetX - BORDER_SIZE * scaleX,\n      offsetY: offsetY - BORDER_SIZE * scaleY,\n      scaleX,\n      scaleY,\n    };\n  }\n  return createMeshCanvas;\n})();\n\nShadingIRs.Mesh = {\n  fromIR: function Mesh_fromIR(raw) {\n    // var type = raw[1];\n    var coords = raw[2];\n    var colors = raw[3];\n    var figures = raw[4];\n    var bounds = raw[5];\n    var matrix = raw[6];\n    // var bbox = raw[7];\n    var background = raw[8];\n    return {\n      type: 'Pattern',\n      getPattern: function Mesh_getPattern(ctx, owner, shadingFill) {\n        var scale;\n        if (shadingFill) {\n          scale = Util.singularValueDecompose2dScale(ctx.mozCurrentTransform);\n        } else {\n          // Obtain scale from matrix and current transformation matrix.\n          scale = Util.singularValueDecompose2dScale(owner.baseTransform);\n          if (matrix) {\n            var matrixScale = Util.singularValueDecompose2dScale(matrix);\n            scale = [scale[0] * matrixScale[0],\n                     scale[1] * matrixScale[1]];\n          }\n        }\n\n        // Rasterizing on the main thread since sending/queue large canvases\n        // might cause OOM.\n        var temporaryPatternCanvas = createMeshCanvas(bounds, scale, coords,\n          colors, figures, shadingFill ? null : background,\n          owner.cachedCanvases, owner.webGLContext);\n\n        if (!shadingFill) {\n          ctx.setTransform.apply(ctx, owner.baseTransform);\n          if (matrix) {\n            ctx.transform.apply(ctx, matrix);\n          }\n        }\n\n        ctx.translate(temporaryPatternCanvas.offsetX,\n                      temporaryPatternCanvas.offsetY);\n        ctx.scale(temporaryPatternCanvas.scaleX,\n                  temporaryPatternCanvas.scaleY);\n\n        return ctx.createPattern(temporaryPatternCanvas.canvas, 'no-repeat');\n      },\n    };\n  },\n};\n\nShadingIRs.Dummy = {\n  fromIR: function Dummy_fromIR() {\n    return {\n      type: 'Pattern',\n      getPattern: function Dummy_fromIR_getPattern() {\n        return 'hotpink';\n      },\n    };\n  },\n};\n\nfunction getShadingPatternFromIR(raw) {\n  var shadingIR = ShadingIRs[raw[0]];\n  if (!shadingIR) {\n    throw new Error(`Unknown IR type: ${raw[0]}`);\n  }\n  return shadingIR.fromIR(raw);\n}\n\nvar TilingPattern = (function TilingPatternClosure() {\n  var PaintType = {\n    COLORED: 1,\n    UNCOLORED: 2,\n  };\n\n  var MAX_PATTERN_SIZE = 3000; // 10in @ 300dpi shall be enough\n\n  function TilingPattern(IR, color, ctx, canvasGraphicsFactory, baseTransform) {\n    this.operatorList = IR[2];\n    this.matrix = IR[3] || [1, 0, 0, 1, 0, 0];\n    this.bbox = IR[4];\n    this.xstep = IR[5];\n    this.ystep = IR[6];\n    this.paintType = IR[7];\n    this.tilingType = IR[8];\n    this.color = color;\n    this.canvasGraphicsFactory = canvasGraphicsFactory;\n    this.baseTransform = baseTransform;\n    this.type = 'Pattern';\n    this.ctx = ctx;\n  }\n\n  TilingPattern.prototype = {\n    createPatternCanvas: function TilinPattern_createPatternCanvas(owner) {\n      var operatorList = this.operatorList;\n      var bbox = this.bbox;\n      var xstep = this.xstep;\n      var ystep = this.ystep;\n      var paintType = this.paintType;\n      var tilingType = this.tilingType;\n      var color = this.color;\n      var canvasGraphicsFactory = this.canvasGraphicsFactory;\n\n      info('TilingType: ' + tilingType);\n\n      var x0 = bbox[0], y0 = bbox[1], x1 = bbox[2], y1 = bbox[3];\n\n      var topLeft = [x0, y0];\n      // we want the canvas to be as large as the step size\n      var botRight = [x0 + xstep, y0 + ystep];\n\n      var width = botRight[0] - topLeft[0];\n      var height = botRight[1] - topLeft[1];\n\n      // Obtain scale from matrix and current transformation matrix.\n      var matrixScale = Util.singularValueDecompose2dScale(this.matrix);\n      var curMatrixScale = Util.singularValueDecompose2dScale(\n        this.baseTransform);\n      var combinedScale = [matrixScale[0] * curMatrixScale[0],\n        matrixScale[1] * curMatrixScale[1]];\n\n      // MAX_PATTERN_SIZE is used to avoid OOM situation.\n      // Use width and height values that are as close as possible to the end\n      // result when the pattern is used. Too low value makes the pattern look\n      // blurry. Too large value makes it look too crispy.\n      width = Math.min(Math.ceil(Math.abs(width * combinedScale[0])),\n        MAX_PATTERN_SIZE);\n\n      height = Math.min(Math.ceil(Math.abs(height * combinedScale[1])),\n        MAX_PATTERN_SIZE);\n\n      var tmpCanvas = owner.cachedCanvases.getCanvas('pattern',\n        width, height, true);\n      var tmpCtx = tmpCanvas.context;\n      var graphics = canvasGraphicsFactory.createCanvasGraphics(tmpCtx);\n      graphics.groupLevel = owner.groupLevel;\n\n      this.setFillAndStrokeStyleToContext(graphics, paintType, color);\n\n      this.setScale(width, height, xstep, ystep);\n      this.transformToScale(graphics);\n\n      // transform coordinates to pattern space\n      var tmpTranslate = [1, 0, 0, 1, -topLeft[0], -topLeft[1]];\n      graphics.transform.apply(graphics, tmpTranslate);\n\n      this.clipBbox(graphics, bbox, x0, y0, x1, y1);\n\n      graphics.executeOperatorList(operatorList);\n      return tmpCanvas.canvas;\n    },\n\n    setScale: function TilingPattern_setScale(width, height, xstep, ystep) {\n      this.scale = [width / xstep, height / ystep];\n    },\n\n    transformToScale: function TilingPattern_transformToScale(graphics) {\n      var scale = this.scale;\n      var tmpScale = [scale[0], 0, 0, scale[1], 0, 0];\n      graphics.transform.apply(graphics, tmpScale);\n    },\n\n    scaleToContext: function TilingPattern_scaleToContext() {\n      var scale = this.scale;\n      this.ctx.scale(1 / scale[0], 1 / scale[1]);\n    },\n\n    clipBbox: function clipBbox(graphics, bbox, x0, y0, x1, y1) {\n      if (Array.isArray(bbox) && bbox.length === 4) {\n        var bboxWidth = x1 - x0;\n        var bboxHeight = y1 - y0;\n        graphics.ctx.rect(x0, y0, bboxWidth, bboxHeight);\n        graphics.clip();\n        graphics.endPath();\n      }\n    },\n\n    setFillAndStrokeStyleToContext:\n      function setFillAndStrokeStyleToContext(graphics, paintType, color) {\n        let context = graphics.ctx, current = graphics.current;\n        switch (paintType) {\n          case PaintType.COLORED:\n            var ctx = this.ctx;\n            context.fillStyle = ctx.fillStyle;\n            context.strokeStyle = ctx.strokeStyle;\n            current.fillColor = ctx.fillStyle;\n            current.strokeColor = ctx.strokeStyle;\n            break;\n          case PaintType.UNCOLORED:\n            var cssColor = Util.makeCssRgb(color[0], color[1], color[2]);\n            context.fillStyle = cssColor;\n            context.strokeStyle = cssColor;\n            // Set color needed by image masks (fixes issues 3226 and 8741).\n            current.fillColor = cssColor;\n            current.strokeColor = cssColor;\n            break;\n          default:\n            throw new FormatError(`Unsupported paint type: ${paintType}`);\n        }\n      },\n\n    getPattern: function TilingPattern_getPattern(ctx, owner) {\n      var temporaryPatternCanvas = this.createPatternCanvas(owner);\n\n      ctx = this.ctx;\n      ctx.setTransform.apply(ctx, this.baseTransform);\n      ctx.transform.apply(ctx, this.matrix);\n      this.scaleToContext();\n\n      return ctx.createPattern(temporaryPatternCanvas, 'repeat');\n    },\n  };\n\n  return TilingPattern;\n})();\n\nexport {\n  getShadingPatternFromIR,\n  TilingPattern,\n};\n","/* Copyright 2018 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nconst GlobalWorkerOptions = Object.create(null);\n\n/**\n * Defines global port for worker process. Overrides the `workerSrc` option.\n * @var {Object}\n */\nGlobalWorkerOptions.workerPort = (GlobalWorkerOptions.workerPort === undefined ?\n                                  null : GlobalWorkerOptions.workerPort);\n\n/**\n * Path and filename of the worker file. Required when workers are enabled in\n * development mode. If unspecified in production builds, the worker will be\n * loaded based on the location of the `pdf.js` file.\n *\n * NOTE: The `workerSrc` should always be set in custom applications, in order\n *       to prevent issues caused by third-party frameworks and libraries.\n * @var {string}\n */\nGlobalWorkerOptions.workerSrc = (GlobalWorkerOptions.workerSrc === undefined ?\n                                 '' : GlobalWorkerOptions.workerSrc);\n\nexport {\n  GlobalWorkerOptions,\n};\n","/* Copyright 2018 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport {\n  AbortException, assert, createPromiseCapability, MissingPDFException,\n  ReadableStream, UnexpectedResponseException, UnknownErrorException\n} from './util';\n\nasync function resolveCall(fn, args, thisArg = null) {\n  if (!fn) {\n    return;\n  }\n  return fn.apply(thisArg, args);\n}\n\nfunction wrapReason(reason) {\n  if (typeof reason !== 'object') {\n    return reason;\n  }\n  switch (reason.name) {\n    case 'AbortException':\n      return new AbortException(reason.message);\n    case 'MissingPDFException':\n      return new MissingPDFException(reason.message);\n    case 'UnexpectedResponseException':\n      return new UnexpectedResponseException(reason.message, reason.status);\n    default:\n      return new UnknownErrorException(reason.message, reason.details);\n  }\n}\n\nfunction makeReasonSerializable(reason) {\n  if (!(reason instanceof Error) ||\n      reason instanceof AbortException ||\n      reason instanceof MissingPDFException ||\n      reason instanceof UnexpectedResponseException ||\n      reason instanceof UnknownErrorException) {\n    return reason;\n  }\n  return new UnknownErrorException(reason.message, reason.toString());\n}\n\nfunction resolveOrReject(capability, success, reason) {\n  if (success) {\n    capability.resolve();\n  } else {\n    capability.reject(reason);\n  }\n}\n\nfunction finalize(promise) {\n  return Promise.resolve(promise).catch(() => {});\n}\n\nfunction MessageHandler(sourceName, targetName, comObj) {\n  this.sourceName = sourceName;\n  this.targetName = targetName;\n  this.comObj = comObj;\n  this.callbackId = 1;\n  this.streamId = 1;\n  this.postMessageTransfers = true;\n  this.streamSinks = Object.create(null);\n  this.streamControllers = Object.create(null);\n  let callbacksCapabilities = this.callbacksCapabilities = Object.create(null);\n  let ah = this.actionHandler = Object.create(null);\n\n  this._onComObjOnMessage = (event) => {\n    let data = event.data;\n    if (data.targetName !== this.sourceName) {\n      return;\n    }\n    if (data.stream) {\n      this._processStreamMessage(data);\n    } else if (data.isReply) {\n      let callbackId = data.callbackId;\n      if (data.callbackId in callbacksCapabilities) {\n        let callback = callbacksCapabilities[callbackId];\n        delete callbacksCapabilities[callbackId];\n        if ('error' in data) {\n          callback.reject(wrapReason(data.error));\n        } else {\n          callback.resolve(data.data);\n        }\n      } else {\n        throw new Error(`Cannot resolve callback ${callbackId}`);\n      }\n    } else if (data.action in ah) {\n      let action = ah[data.action];\n      if (data.callbackId) {\n        let sourceName = this.sourceName;\n        let targetName = data.sourceName;\n        Promise.resolve().then(function () {\n          return action[0].call(action[1], data.data);\n        }).then((result) => {\n          comObj.postMessage({\n            sourceName,\n            targetName,\n            isReply: true,\n            callbackId: data.callbackId,\n            data: result,\n          });\n        }, (reason) => {\n          comObj.postMessage({\n            sourceName,\n            targetName,\n            isReply: true,\n            callbackId: data.callbackId,\n            error: makeReasonSerializable(reason),\n          });\n        });\n      } else if (data.streamId) {\n        this._createStreamSink(data);\n      } else {\n        action[0].call(action[1], data.data);\n      }\n    } else {\n      throw new Error(`Unknown action from worker: ${data.action}`);\n    }\n  };\n  comObj.addEventListener('message', this._onComObjOnMessage);\n}\n\nMessageHandler.prototype = {\n  on(actionName, handler, scope) {\n    var ah = this.actionHandler;\n    if (ah[actionName]) {\n      throw new Error(`There is already an actionName called \"${actionName}\"`);\n    }\n    ah[actionName] = [handler, scope];\n  },\n  /**\n   * Sends a message to the comObj to invoke the action with the supplied data.\n   * @param {String} actionName - Action to call.\n   * @param {JSON} data - JSON data to send.\n   * @param {Array} [transfers] - Optional list of transfers/ArrayBuffers\n   */\n  send(actionName, data, transfers) {\n    var message = {\n      sourceName: this.sourceName,\n      targetName: this.targetName,\n      action: actionName,\n      data,\n    };\n    this.postMessage(message, transfers);\n  },\n  /**\n   * Sends a message to the comObj to invoke the action with the supplied data.\n   * Expects that the other side will callback with the response.\n   * @param {String} actionName - Action to call.\n   * @param {JSON} data - JSON data to send.\n   * @param {Array} [transfers] - Optional list of transfers/ArrayBuffers.\n   * @returns {Promise} Promise to be resolved with response data.\n   */\n  sendWithPromise(actionName, data, transfers) {\n    var callbackId = this.callbackId++;\n    var message = {\n      sourceName: this.sourceName,\n      targetName: this.targetName,\n      action: actionName,\n      data,\n      callbackId,\n    };\n    var capability = createPromiseCapability();\n    this.callbacksCapabilities[callbackId] = capability;\n    try {\n      this.postMessage(message, transfers);\n    } catch (e) {\n      capability.reject(e);\n    }\n    return capability.promise;\n  },\n  /**\n   * Sends a message to the comObj to invoke the action with the supplied data.\n   * Expect that the other side will callback to signal 'start_complete'.\n   * @param {String} actionName - Action to call.\n   * @param {JSON} data - JSON data to send.\n   * @param {Object} queueingStrategy - strategy to signal backpressure based on\n   *                 internal queue.\n   * @param {Array} [transfers] - Optional list of transfers/ArrayBuffers.\n   * @return {ReadableStream} ReadableStream to read data in chunks.\n   */\n  sendWithStream(actionName, data, queueingStrategy, transfers) {\n    let streamId = this.streamId++;\n    let sourceName = this.sourceName;\n    let targetName = this.targetName;\n\n    return new ReadableStream({\n      start: (controller) => {\n        let startCapability = createPromiseCapability();\n        this.streamControllers[streamId] = {\n          controller,\n          startCall: startCapability,\n          isClosed: false,\n        };\n        this.postMessage({\n          sourceName,\n          targetName,\n          action: actionName,\n          streamId,\n          data,\n          desiredSize: controller.desiredSize,\n        });\n        // Return Promise for Async process, to signal success/failure.\n        return startCapability.promise;\n      },\n\n      pull: (controller) => {\n        let pullCapability = createPromiseCapability();\n        this.streamControllers[streamId].pullCall = pullCapability;\n        this.postMessage({\n          sourceName,\n          targetName,\n          stream: 'pull',\n          streamId,\n          desiredSize: controller.desiredSize,\n        });\n        // Returning Promise will not call \"pull\"\n        // again until current pull is resolved.\n        return pullCapability.promise;\n      },\n\n      cancel: (reason) => {\n        let cancelCapability = createPromiseCapability();\n        this.streamControllers[streamId].cancelCall = cancelCapability;\n        this.streamControllers[streamId].isClosed = true;\n        this.postMessage({\n          sourceName,\n          targetName,\n          stream: 'cancel',\n          reason,\n          streamId,\n        });\n        // Return Promise to signal success or failure.\n        return cancelCapability.promise;\n      },\n    }, queueingStrategy);\n  },\n\n  _createStreamSink(data) {\n    let self = this;\n    let action = this.actionHandler[data.action];\n    let streamId = data.streamId;\n    let desiredSize = data.desiredSize;\n    let sourceName = this.sourceName;\n    let targetName = data.sourceName;\n    let capability = createPromiseCapability();\n\n    let sendStreamRequest = ({ stream, chunk, transfers,\n                               success, reason, }) => {\n      this.postMessage({ sourceName, targetName, stream, streamId,\n                         chunk, success, reason, }, transfers);\n    };\n\n    let streamSink = {\n      enqueue(chunk, size = 1, transfers) {\n        if (this.isCancelled) {\n          return;\n        }\n        let lastDesiredSize = this.desiredSize;\n        this.desiredSize -= size;\n        // Enqueue decreases the desiredSize property of sink,\n        // so when it changes from positive to negative,\n        // set ready as unresolved promise.\n        if (lastDesiredSize > 0 && this.desiredSize <= 0) {\n          this.sinkCapability = createPromiseCapability();\n          this.ready = this.sinkCapability.promise;\n        }\n        sendStreamRequest({ stream: 'enqueue', chunk, transfers, });\n      },\n\n      close() {\n        if (this.isCancelled) {\n          return;\n        }\n        this.isCancelled = true;\n        sendStreamRequest({ stream: 'close', });\n        delete self.streamSinks[streamId];\n      },\n\n      error(reason) {\n        if (this.isCancelled) {\n          return;\n        }\n        this.isCancelled = true;\n        sendStreamRequest({ stream: 'error', reason, });\n      },\n\n      sinkCapability: capability,\n      onPull: null,\n      onCancel: null,\n      isCancelled: false,\n      desiredSize,\n      ready: null,\n    };\n\n    streamSink.sinkCapability.resolve();\n    streamSink.ready = streamSink.sinkCapability.promise;\n    this.streamSinks[streamId] = streamSink;\n    resolveCall(action[0], [data.data, streamSink], action[1]).then(() => {\n      sendStreamRequest({ stream: 'start_complete', success: true, });\n    }, (reason) => {\n      sendStreamRequest({ stream: 'start_complete', success: false, reason, });\n    });\n  },\n\n  _processStreamMessage(data) {\n    let sourceName = this.sourceName;\n    let targetName = data.sourceName;\n    let streamId = data.streamId;\n\n    let sendStreamResponse = ({ stream, success, reason, }) => {\n      this.comObj.postMessage({ sourceName, targetName, stream,\n                                success, streamId, reason, });\n    };\n\n    let deleteStreamController = () => {\n      // Delete streamController only when start, pull and\n      // cancel callbacks are resolved, to avoid \"TypeError\".\n      Promise.all([\n        this.streamControllers[data.streamId].startCall,\n        this.streamControllers[data.streamId].pullCall,\n        this.streamControllers[data.streamId].cancelCall\n      ].map(function(capability) {\n        return capability && finalize(capability.promise);\n      })).then(() => {\n        delete this.streamControllers[data.streamId];\n      });\n    };\n\n    switch (data.stream) {\n      case 'start_complete':\n        resolveOrReject(this.streamControllers[data.streamId].startCall,\n                        data.success, wrapReason(data.reason));\n        break;\n      case 'pull_complete':\n        resolveOrReject(this.streamControllers[data.streamId].pullCall,\n                        data.success, wrapReason(data.reason));\n        break;\n      case 'pull':\n        // Ignore any pull after close is called.\n        if (!this.streamSinks[data.streamId]) {\n          sendStreamResponse({ stream: 'pull_complete', success: true, });\n          break;\n        }\n        // Pull increases the desiredSize property of sink,\n        // so when it changes from negative to positive,\n        // set ready property as resolved promise.\n        if (this.streamSinks[data.streamId].desiredSize <= 0 &&\n            data.desiredSize > 0) {\n          this.streamSinks[data.streamId].sinkCapability.resolve();\n        }\n        // Reset desiredSize property of sink on every pull.\n        this.streamSinks[data.streamId].desiredSize = data.desiredSize;\n        resolveCall(this.streamSinks[data.streamId].onPull).then(() => {\n          sendStreamResponse({ stream: 'pull_complete', success: true, });\n        }, (reason) => {\n          sendStreamResponse({ stream: 'pull_complete',\n                               success: false, reason, });\n        });\n        break;\n      case 'enqueue':\n        assert(this.streamControllers[data.streamId],\n               'enqueue should have stream controller');\n        if (!this.streamControllers[data.streamId].isClosed) {\n          this.streamControllers[data.streamId].controller.enqueue(data.chunk);\n        }\n        break;\n      case 'close':\n        assert(this.streamControllers[data.streamId],\n               'close should have stream controller');\n        if (this.streamControllers[data.streamId].isClosed) {\n          break;\n        }\n        this.streamControllers[data.streamId].isClosed = true;\n        this.streamControllers[data.streamId].controller.close();\n        deleteStreamController();\n        break;\n      case 'error':\n        assert(this.streamControllers[data.streamId],\n               'error should have stream controller');\n        this.streamControllers[data.streamId].controller.\n          error(wrapReason(data.reason));\n        deleteStreamController();\n        break;\n      case 'cancel_complete':\n        resolveOrReject(this.streamControllers[data.streamId].cancelCall,\n                        data.success, wrapReason(data.reason));\n        deleteStreamController();\n        break;\n      case 'cancel':\n        if (!this.streamSinks[data.streamId]) {\n          break;\n        }\n        resolveCall(this.streamSinks[data.streamId].onCancel,\n                    [wrapReason(data.reason)]).then(() => {\n          sendStreamResponse({ stream: 'cancel_complete', success: true, });\n        }, (reason) => {\n          sendStreamResponse({ stream: 'cancel_complete',\n                               success: false, reason, });\n        });\n        this.streamSinks[data.streamId].sinkCapability.\n          reject(wrapReason(data.reason));\n        this.streamSinks[data.streamId].isCancelled = true;\n        delete this.streamSinks[data.streamId];\n        break;\n      default:\n        throw new Error('Unexpected stream case');\n    }\n  },\n\n  /**\n   * Sends raw message to the comObj.\n   * @private\n   * @param {Object} message - Raw message.\n   * @param transfers List of transfers/ArrayBuffers, or undefined.\n   */\n  postMessage(message, transfers) {\n    if (transfers && this.postMessageTransfers) {\n      this.comObj.postMessage(message, transfers);\n    } else {\n      this.comObj.postMessage(message);\n    }\n  },\n\n  destroy() {\n    this.comObj.removeEventListener('message', this._onComObjOnMessage);\n  },\n};\n\nexport {\n  MessageHandler,\n};\n","/* Copyright 2012 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { assert } from '../shared/util';\nimport { SimpleXMLParser } from './xml_parser';\n\nclass Metadata {\n  constructor(data) {\n    assert(typeof data === 'string', 'Metadata: input is not a string');\n\n    // Ghostscript may produce invalid metadata, so try to repair that first.\n    data = this._repair(data);\n\n    // Convert the string to an XML document.\n    let parser = new SimpleXMLParser();\n    const xmlDocument = parser.parseFromString(data);\n\n    this._metadata = Object.create(null);\n\n    if (xmlDocument) {\n      this._parse(xmlDocument);\n    }\n  }\n\n  _repair(data) {\n    // Start by removing any \"junk\" before the first tag (see issue 10395).\n    return data.replace(/^([^<]+)/, '').replace(/>\\\\376\\\\377([^<]+)/g,\n        function(all, codes) {\n      let bytes = codes.replace(/\\\\([0-3])([0-7])([0-7])/g,\n          function(code, d1, d2, d3) {\n        return String.fromCharCode(d1 * 64 + d2 * 8 + d3 * 1);\n      }).replace(/&(amp|apos|gt|lt|quot);/g, function(str, name) {\n        switch (name) {\n          case 'amp':\n            return '&';\n          case 'apos':\n            return '\\'';\n          case 'gt':\n            return '>';\n          case 'lt':\n            return '<';\n          case 'quot':\n            return '\\\"';\n        }\n        throw new Error(`_repair: ${name} isn't defined.`);\n      });\n\n      let chars = '';\n      for (let i = 0, ii = bytes.length; i < ii; i += 2) {\n        let code = bytes.charCodeAt(i) * 256 + bytes.charCodeAt(i + 1);\n        if (code >= 32 && code < 127 && code !== 60 && code !== 62 &&\n            code !== 38) {\n          chars += String.fromCharCode(code);\n        } else {\n          chars += '&#x' + (0x10000 + code).toString(16).substring(1) + ';';\n        }\n      }\n\n      return '>' + chars;\n    });\n  }\n\n  _parse(xmlDocument) {\n    let rdf = xmlDocument.documentElement;\n\n    if (rdf.nodeName.toLowerCase() !== 'rdf:rdf') { // Wrapped in <xmpmeta>\n      rdf = rdf.firstChild;\n      while (rdf && rdf.nodeName.toLowerCase() !== 'rdf:rdf') {\n        rdf = rdf.nextSibling;\n      }\n    }\n\n    let nodeName = rdf ? rdf.nodeName.toLowerCase() : null;\n    if (!rdf || nodeName !== 'rdf:rdf' || !rdf.hasChildNodes()) {\n      return;\n    }\n\n    let children = rdf.childNodes;\n    for (let i = 0, ii = children.length; i < ii; i++) {\n      let desc = children[i];\n      if (desc.nodeName.toLowerCase() !== 'rdf:description') {\n        continue;\n      }\n\n      for (let j = 0, jj = desc.childNodes.length; j < jj; j++) {\n        if (desc.childNodes[j].nodeName.toLowerCase() !== '#text') {\n          let entry = desc.childNodes[j];\n          let name = entry.nodeName.toLowerCase();\n\n          this._metadata[name] = entry.textContent.trim();\n        }\n      }\n    }\n  }\n\n  get(name) {\n    const data = this._metadata[name];\n    return (typeof data !== 'undefined' ? data : null);\n  }\n\n  getAll() {\n    return this._metadata;\n  }\n\n  has(name) {\n    return typeof this._metadata[name] !== 'undefined';\n  }\n}\n\nexport {\n  Metadata,\n};\n","/* Copyright 2018 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n// The code for XMLParserBase copied from\n// https://github.com/mozilla/shumway/blob/16451d8836fa85f4b16eeda8b4bda2fa9e2b22b0/src/avm2/natives/xml.ts\n\nconst XMLParserErrorCode = {\n  NoError: 0,\n  EndOfDocument: -1,\n  UnterminatedCdat: -2,\n  UnterminatedXmlDeclaration: -3,\n  UnterminatedDoctypeDeclaration: -4,\n  UnterminatedComment: -5,\n  MalformedElement: -6,\n  OutOfMemory: -7,\n  UnterminatedAttributeValue: -8,\n  UnterminatedElement: -9,\n  ElementNeverBegun: -10,\n};\n\nfunction isWhitespace(s, index) {\n  const ch = s[index];\n  return ch === ' ' || ch === '\\n' || ch === '\\r' || ch === '\\t';\n}\n\nfunction isWhitespaceString(s) {\n  for (let i = 0, ii = s.length; i < ii; i++) {\n    if (!isWhitespace(s, i)) {\n      return false;\n    }\n  }\n  return true;\n}\n\nclass XMLParserBase {\n  _resolveEntities(s) {\n    return s.replace(/&([^;]+);/g, (all, entity) => {\n      if (entity.substring(0, 2) === '#x') {\n        return String.fromCharCode(parseInt(entity.substring(2), 16));\n      } else if (entity.substring(0, 1) === '#') {\n        return String.fromCharCode(parseInt(entity.substring(1), 10));\n      }\n      switch (entity) {\n        case 'lt':\n          return '<';\n        case 'gt':\n          return '>';\n        case 'amp':\n          return '&';\n        case 'quot':\n          return '\\\"';\n      }\n      return this.onResolveEntity(entity);\n    });\n  }\n\n  _parseContent(s, start) {\n    let pos = start, name, attributes = [];\n\n    function skipWs() {\n      while (pos < s.length && isWhitespace(s, pos)) {\n        ++pos;\n      }\n    }\n\n    while (pos < s.length && !isWhitespace(s, pos) &&\n           s[pos] !== '>' && s[pos] !== '/') {\n      ++pos;\n    }\n    name = s.substring(start, pos);\n    skipWs();\n    while (pos < s.length && s[pos] !== '>' &&\n           s[pos] !== '/' && s[pos] !== '?') {\n      skipWs();\n      let attrName = '', attrValue = '';\n      while (pos < s.length && !isWhitespace(s, pos) && s[pos] !== '=') {\n        attrName += s[pos];\n        ++pos;\n      }\n      skipWs();\n      if (s[pos] !== '=') {\n        return null;\n      }\n      ++pos;\n      skipWs();\n      const attrEndChar = s[pos];\n      if (attrEndChar !== '\\\"' && attrEndChar !== '\\'') {\n        return null;\n      }\n      const attrEndIndex = s.indexOf(attrEndChar, ++pos);\n      if (attrEndIndex < 0) {\n        return null;\n      }\n      attrValue = s.substring(pos, attrEndIndex);\n      attributes.push({\n        name: attrName,\n        value: this._resolveEntities(attrValue),\n      });\n      pos = attrEndIndex + 1;\n      skipWs();\n    }\n    return {\n      name,\n      attributes,\n      parsed: pos - start,\n    };\n  }\n\n  _parseProcessingInstruction(s, start) {\n    let pos = start, name, value;\n\n    function skipWs() {\n      while (pos < s.length && isWhitespace(s, pos)) {\n        ++pos;\n      }\n    }\n\n    while (pos < s.length && !isWhitespace(s, pos) &&\n           s[pos] !== '>' && s[pos] !== '/') {\n      ++pos;\n    }\n    name = s.substring(start, pos);\n    skipWs();\n    const attrStart = pos;\n    while (pos < s.length && (s[pos] !== '?' || s[pos + 1] !== '>')) {\n      ++pos;\n    }\n    value = s.substring(attrStart, pos);\n    return {\n      name,\n      value,\n      parsed: pos - start,\n    };\n  }\n\n  parseXml(s) {\n    let i = 0;\n    while (i < s.length) {\n      const ch = s[i];\n      let j = i;\n      if (ch === '<') {\n        ++j;\n        const ch2 = s[j];\n        let q;\n        switch (ch2) {\n          case '/':\n            ++j;\n            q = s.indexOf('>', j);\n            if (q < 0) {\n              this.onError(XMLParserErrorCode.UnterminatedElement);\n              return;\n            }\n            this.onEndElement(s.substring(j, q));\n            j = q + 1;\n            break;\n          case '?':\n            ++j;\n            const pi = this._parseProcessingInstruction(s, j);\n            if (s.substring(j + pi.parsed, j + pi.parsed + 2) !== '?>') {\n              this.onError(XMLParserErrorCode.UnterminatedXmlDeclaration);\n              return;\n            }\n            this.onPi(pi.name, pi.value);\n            j += pi.parsed + 2;\n            break;\n          case '!':\n            if (s.substring(j + 1, j + 3) === '--') {\n              q = s.indexOf('-->', j + 3);\n              if (q < 0) {\n                this.onError(XMLParserErrorCode.UnterminatedComment);\n                return;\n              }\n              this.onComment(s.substring(j + 3, q));\n              j = q + 3;\n            } else if (s.substring(j + 1, j + 8) === '[CDATA[') {\n              q = s.indexOf(']]>', j + 8);\n              if (q < 0) {\n                this.onError(XMLParserErrorCode.UnterminatedCdat);\n                return;\n              }\n              this.onCdata(s.substring(j + 8, q));\n              j = q + 3;\n            } else if (s.substring(j + 1, j + 8) === 'DOCTYPE') {\n              const q2 = s.indexOf('[', j + 8);\n              let complexDoctype = false;\n              q = s.indexOf('>', j + 8);\n              if (q < 0) {\n                this.onError(XMLParserErrorCode.UnterminatedDoctypeDeclaration);\n                return;\n              }\n              if (q2 > 0 && q > q2) {\n                q = s.indexOf(']>', j + 8);\n                if (q < 0) {\n                  this.onError(\n                    XMLParserErrorCode.UnterminatedDoctypeDeclaration);\n                  return;\n                }\n                complexDoctype = true;\n              }\n              const doctypeContent =\n                s.substring(j + 8, q + (complexDoctype ? 1 : 0));\n              this.onDoctype(doctypeContent);\n              j = q + (complexDoctype ? 2 : 1);\n            } else {\n              this.onError(XMLParserErrorCode.MalformedElement);\n              return;\n            }\n            break;\n          default:\n            const content = this._parseContent(s, j);\n            if (content === null) {\n              this.onError(XMLParserErrorCode.MalformedElement);\n              return;\n            }\n            let isClosed = false;\n            if (s.substring(j + content.parsed,\n                            j + content.parsed + 2) === '/>') {\n              isClosed = true;\n            } else if (s.substring(j + content.parsed,\n                       j + content.parsed + 1) !== '>') {\n              this.onError(XMLParserErrorCode.UnterminatedElement);\n              return;\n            }\n            this.onBeginElement(content.name, content.attributes, isClosed);\n            j += content.parsed + (isClosed ? 2 : 1);\n            break;\n        }\n      } else {\n        while (j < s.length && s[j] !== '<') {\n          j++;\n        }\n        const text = s.substring(i, j);\n        this.onText(this._resolveEntities(text));\n      }\n      i = j;\n    }\n  }\n\n  onResolveEntity(name) {\n    return `&${name};`;\n  }\n\n  onPi(name, value) { }\n\n  onComment(text) { }\n\n  onCdata(text) { }\n\n  onDoctype(doctypeContent) { }\n\n  onText(text) { }\n\n  onBeginElement(name, attributes, isEmpty) { }\n\n  onEndElement(name) { }\n\n  onError(code) { }\n}\n\nclass SimpleDOMNode {\n  constructor(nodeName, nodeValue) {\n    this.nodeName = nodeName;\n    this.nodeValue = nodeValue;\n\n    Object.defineProperty(this, 'parentNode', { value: null, writable: true, });\n  }\n\n  get firstChild() {\n    return this.childNodes && this.childNodes[0];\n  }\n\n  get nextSibling() {\n    const childNodes = this.parentNode.childNodes;\n    if (!childNodes) {\n      return undefined;\n    }\n    const index = childNodes.indexOf(this);\n    if (index === -1) {\n      return undefined;\n    }\n    return childNodes[index + 1];\n  }\n\n  get textContent() {\n    if (!this.childNodes) {\n      return this.nodeValue || '';\n    }\n    return this.childNodes.map(function(child) {\n      return child.textContent;\n    }).join('');\n  }\n\n  hasChildNodes() {\n    return this.childNodes && this.childNodes.length > 0;\n  }\n}\n\nclass SimpleXMLParser extends XMLParserBase {\n  constructor() {\n    super();\n    this._currentFragment = null;\n    this._stack = null;\n    this._errorCode = XMLParserErrorCode.NoError;\n  }\n\n  parseFromString(data) {\n    this._currentFragment = [];\n    this._stack = [];\n    this._errorCode = XMLParserErrorCode.NoError;\n\n    this.parseXml(data);\n\n    if (this._errorCode !== XMLParserErrorCode.NoError) {\n      return undefined; // return undefined on error\n    }\n\n    // We should only have one root.\n    const [documentElement] = this._currentFragment;\n    if (!documentElement) {\n      return undefined; // Return undefined if no root was found.\n    }\n    return { documentElement, };\n  }\n\n  onResolveEntity(name) {\n    switch (name) {\n      case 'apos':\n        return '\\'';\n    }\n    return super.onResolveEntity(name);\n  }\n\n  onText(text) {\n    if (isWhitespaceString(text)) {\n      return;\n    }\n    const node = new SimpleDOMNode('#text', text);\n    this._currentFragment.push(node);\n  }\n\n  onCdata(text) {\n    const node = new SimpleDOMNode('#text', text);\n    this._currentFragment.push(node);\n  }\n\n  onBeginElement(name, attributes, isEmpty) {\n    const node = new SimpleDOMNode(name);\n    node.childNodes = [];\n    this._currentFragment.push(node);\n    if (isEmpty) {\n      return;\n    }\n    this._stack.push(this._currentFragment);\n    this._currentFragment = node.childNodes;\n  }\n\n  onEndElement(name) {\n    this._currentFragment = this._stack.pop() || [];\n    const lastElement = this._currentFragment[this._currentFragment.length - 1];\n    if (!lastElement) {\n      return;\n    }\n    for (let i = 0, ii = lastElement.childNodes.length; i < ii; i++) {\n      lastElement.childNodes[i].parentNode = lastElement;\n    }\n  }\n\n  onError(code) {\n    this._errorCode = code;\n  }\n}\n\nexport {\n  SimpleXMLParser,\n};\n","/* Copyright 2012 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { assert, createPromiseCapability } from '../shared/util';\n\n /** @implements {IPDFStream} */\nvar PDFDataTransportStream = (function PDFDataTransportStreamClosure() {\n  function PDFDataTransportStream(params, pdfDataRangeTransport) {\n    assert(pdfDataRangeTransport);\n\n    this._queuedChunks = [];\n    var initialData = params.initialData;\n    if (initialData && initialData.length > 0) {\n      let buffer = new Uint8Array(initialData).buffer;\n      this._queuedChunks.push(buffer);\n    }\n\n    this._pdfDataRangeTransport = pdfDataRangeTransport;\n    this._isStreamingSupported = !params.disableStream;\n    this._isRangeSupported = !params.disableRange;\n    this._contentLength = params.length;\n\n    this._fullRequestReader = null;\n    this._rangeReaders = [];\n\n    this._pdfDataRangeTransport.addRangeListener((begin, chunk) => {\n      this._onReceiveData({ begin, chunk, });\n    });\n\n    this._pdfDataRangeTransport.addProgressListener((loaded) => {\n      this._onProgress({ loaded, });\n    });\n\n    this._pdfDataRangeTransport.addProgressiveReadListener((chunk) => {\n      this._onReceiveData({ chunk, });\n    });\n\n    this._pdfDataRangeTransport.transportReady();\n  }\n  PDFDataTransportStream.prototype = {\n    _onReceiveData: function PDFDataTransportStream_onReceiveData(args) {\n       let buffer = new Uint8Array(args.chunk).buffer;\n       if (args.begin === undefined) {\n         if (this._fullRequestReader) {\n           this._fullRequestReader._enqueue(buffer);\n         } else {\n           this._queuedChunks.push(buffer);\n         }\n       } else {\n         var found = this._rangeReaders.some(function (rangeReader) {\n           if (rangeReader._begin !== args.begin) {\n             return false;\n           }\n           rangeReader._enqueue(buffer);\n           return true;\n         });\n         assert(found);\n       }\n    },\n\n    _onProgress: function PDFDataTransportStream_onDataProgress(evt) {\n       if (this._rangeReaders.length > 0) {\n         // Reporting to first range reader.\n         var firstReader = this._rangeReaders[0];\n         if (firstReader.onProgress) {\n           firstReader.onProgress({ loaded: evt.loaded, });\n         }\n       }\n    },\n\n    _removeRangeReader:\n        function PDFDataTransportStream_removeRangeReader(reader) {\n      var i = this._rangeReaders.indexOf(reader);\n      if (i >= 0) {\n        this._rangeReaders.splice(i, 1);\n      }\n    },\n\n    getFullReader: function PDFDataTransportStream_getFullReader() {\n      assert(!this._fullRequestReader);\n      var queuedChunks = this._queuedChunks;\n      this._queuedChunks = null;\n      return new PDFDataTransportStreamReader(this, queuedChunks);\n    },\n\n    getRangeReader: function PDFDataTransportStream_getRangeReader(begin, end) {\n      var reader = new PDFDataTransportStreamRangeReader(this, begin, end);\n      this._pdfDataRangeTransport.requestDataRange(begin, end);\n      this._rangeReaders.push(reader);\n      return reader;\n    },\n\n    cancelAllRequests:\n        function PDFDataTransportStream_cancelAllRequests(reason) {\n      if (this._fullRequestReader) {\n        this._fullRequestReader.cancel(reason);\n      }\n      var readers = this._rangeReaders.slice(0);\n      readers.forEach(function (rangeReader) {\n        rangeReader.cancel(reason);\n      });\n      this._pdfDataRangeTransport.abort();\n    },\n  };\n\n  /** @implements {IPDFStreamReader} */\n  function PDFDataTransportStreamReader(stream, queuedChunks) {\n    this._stream = stream;\n    this._done = false;\n    this._filename = null;\n    this._queuedChunks = queuedChunks || [];\n    this._requests = [];\n    this._headersReady = Promise.resolve();\n    stream._fullRequestReader = this;\n\n    this.onProgress = null; // not used\n  }\n  PDFDataTransportStreamReader.prototype = {\n    _enqueue: function PDFDataTransportStreamReader_enqueue(chunk) {\n      if (this._done) {\n        return; // ignore new data\n      }\n      if (this._requests.length > 0) {\n        var requestCapability = this._requests.shift();\n        requestCapability.resolve({ value: chunk, done: false, });\n        return;\n      }\n      this._queuedChunks.push(chunk);\n    },\n\n    get headersReady() {\n      return this._headersReady;\n    },\n\n    get filename() {\n      return this._filename;\n    },\n\n    get isRangeSupported() {\n      return this._stream._isRangeSupported;\n    },\n\n    get isStreamingSupported() {\n      return this._stream._isStreamingSupported;\n    },\n\n    get contentLength() {\n      return this._stream._contentLength;\n    },\n\n    async read() {\n      if (this._queuedChunks.length > 0) {\n        var chunk = this._queuedChunks.shift();\n        return { value: chunk, done: false, };\n      }\n      if (this._done) {\n        return { value: undefined, done: true, };\n      }\n      var requestCapability = createPromiseCapability();\n      this._requests.push(requestCapability);\n      return requestCapability.promise;\n    },\n\n    cancel: function PDFDataTransportStreamReader_cancel(reason) {\n      this._done = true;\n      this._requests.forEach(function (requestCapability) {\n        requestCapability.resolve({ value: undefined, done: true, });\n      });\n      this._requests = [];\n    },\n  };\n\n  /** @implements {IPDFStreamRangeReader} */\n  function PDFDataTransportStreamRangeReader(stream, begin, end) {\n    this._stream = stream;\n    this._begin = begin;\n    this._end = end;\n    this._queuedChunk = null;\n    this._requests = [];\n    this._done = false;\n\n    this.onProgress = null;\n  }\n  PDFDataTransportStreamRangeReader.prototype = {\n    _enqueue: function PDFDataTransportStreamRangeReader_enqueue(chunk) {\n      if (this._done) {\n        return; // ignore new data\n      }\n      if (this._requests.length === 0) {\n        this._queuedChunk = chunk;\n      } else {\n        var requestsCapability = this._requests.shift();\n        requestsCapability.resolve({ value: chunk, done: false, });\n        this._requests.forEach(function (requestCapability) {\n          requestCapability.resolve({ value: undefined, done: true, });\n        });\n        this._requests = [];\n      }\n      this._done = true;\n      this._stream._removeRangeReader(this);\n    },\n\n    get isStreamingSupported() {\n      return false;\n    },\n\n    async read() {\n      if (this._queuedChunk) {\n        let chunk = this._queuedChunk;\n        this._queuedChunk = null;\n        return { value: chunk, done: false, };\n      }\n      if (this._done) {\n        return { value: undefined, done: true, };\n      }\n      var requestCapability = createPromiseCapability();\n      this._requests.push(requestCapability);\n      return requestCapability.promise;\n    },\n\n    cancel: function PDFDataTransportStreamRangeReader_cancel(reason) {\n      this._done = true;\n      this._requests.forEach(function (requestCapability) {\n        requestCapability.resolve({ value: undefined, done: true, });\n      });\n      this._requests = [];\n      this._stream._removeRangeReader(this);\n    },\n  };\n\n  return PDFDataTransportStream;\n})();\n\nexport {\n  PDFDataTransportStream,\n};\n","/* Copyright 2014 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n/* eslint-disable no-multi-str */\n\nimport { shadow } from '../shared/util';\n\nclass WebGLContext {\n  constructor({ enable = false, }) {\n    this._enabled = enable === true;\n  }\n\n  get isEnabled() {\n    let enabled = this._enabled;\n    if (enabled) {\n      enabled = WebGLUtils.tryInitGL();\n    }\n    return shadow(this, 'isEnabled', enabled);\n  }\n\n  composeSMask({ layer, mask, properties, }) {\n    return WebGLUtils.composeSMask(layer, mask, properties);\n  }\n\n  drawFigures({ width, height, backgroundColor, figures, context, }) {\n    return WebGLUtils.drawFigures(width, height, backgroundColor, figures,\n                                  context);\n  }\n\n  clear() {\n    WebGLUtils.cleanup();\n  }\n}\n\nvar WebGLUtils = (function WebGLUtilsClosure() {\n  function loadShader(gl, code, shaderType) {\n    var shader = gl.createShader(shaderType);\n    gl.shaderSource(shader, code);\n    gl.compileShader(shader);\n    var compiled = gl.getShaderParameter(shader, gl.COMPILE_STATUS);\n    if (!compiled) {\n      var errorMsg = gl.getShaderInfoLog(shader);\n      throw new Error('Error during shader compilation: ' + errorMsg);\n    }\n    return shader;\n  }\n  function createVertexShader(gl, code) {\n    return loadShader(gl, code, gl.VERTEX_SHADER);\n  }\n  function createFragmentShader(gl, code) {\n    return loadShader(gl, code, gl.FRAGMENT_SHADER);\n  }\n  function createProgram(gl, shaders) {\n    var program = gl.createProgram();\n    for (var i = 0, ii = shaders.length; i < ii; ++i) {\n      gl.attachShader(program, shaders[i]);\n    }\n    gl.linkProgram(program);\n    var linked = gl.getProgramParameter(program, gl.LINK_STATUS);\n    if (!linked) {\n      var errorMsg = gl.getProgramInfoLog(program);\n      throw new Error('Error during program linking: ' + errorMsg);\n    }\n    return program;\n  }\n  function createTexture(gl, image, textureId) {\n    gl.activeTexture(textureId);\n    var texture = gl.createTexture();\n    gl.bindTexture(gl.TEXTURE_2D, texture);\n\n    // Set the parameters so we can render any size image.\n    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);\n    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);\n    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);\n    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);\n\n    // Upload the image into the texture.\n    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);\n    return texture;\n  }\n\n  var currentGL, currentCanvas;\n  function generateGL() {\n    if (currentGL) {\n      return;\n    }\n\n    // The temporary canvas is used in the WebGL context.\n    currentCanvas = document.createElement('canvas');\n    currentGL = currentCanvas.getContext('webgl',\n      { premultipliedalpha: false, });\n  }\n\n  var smaskVertexShaderCode = '\\\n  attribute vec2 a_position;                                    \\\n  attribute vec2 a_texCoord;                                    \\\n                                                                \\\n  uniform vec2 u_resolution;                                    \\\n                                                                \\\n  varying vec2 v_texCoord;                                      \\\n                                                                \\\n  void main() {                                                 \\\n    vec2 clipSpace = (a_position / u_resolution) * 2.0 - 1.0;   \\\n    gl_Position = vec4(clipSpace * vec2(1, -1), 0, 1);          \\\n                                                                \\\n    v_texCoord = a_texCoord;                                    \\\n  }                                                             ';\n\n  var smaskFragmentShaderCode = '\\\n  precision mediump float;                                      \\\n                                                                \\\n  uniform vec4 u_backdrop;                                      \\\n  uniform int u_subtype;                                        \\\n  uniform sampler2D u_image;                                    \\\n  uniform sampler2D u_mask;                                     \\\n                                                                \\\n  varying vec2 v_texCoord;                                      \\\n                                                                \\\n  void main() {                                                 \\\n    vec4 imageColor = texture2D(u_image, v_texCoord);           \\\n    vec4 maskColor = texture2D(u_mask, v_texCoord);             \\\n    if (u_backdrop.a > 0.0) {                                   \\\n      maskColor.rgb = maskColor.rgb * maskColor.a +             \\\n                      u_backdrop.rgb * (1.0 - maskColor.a);     \\\n    }                                                           \\\n    float lum;                                                  \\\n    if (u_subtype == 0) {                                       \\\n      lum = maskColor.a;                                        \\\n    } else {                                                    \\\n      lum = maskColor.r * 0.3 + maskColor.g * 0.59 +            \\\n            maskColor.b * 0.11;                                 \\\n    }                                                           \\\n    imageColor.a *= lum;                                        \\\n    imageColor.rgb *= imageColor.a;                             \\\n    gl_FragColor = imageColor;                                  \\\n  }                                                             ';\n\n  var smaskCache = null;\n\n  function initSmaskGL() {\n    var canvas, gl;\n\n    generateGL();\n    canvas = currentCanvas;\n    currentCanvas = null;\n    gl = currentGL;\n    currentGL = null;\n\n    // setup a GLSL program\n    var vertexShader = createVertexShader(gl, smaskVertexShaderCode);\n    var fragmentShader = createFragmentShader(gl, smaskFragmentShaderCode);\n    var program = createProgram(gl, [vertexShader, fragmentShader]);\n    gl.useProgram(program);\n\n    var cache = {};\n    cache.gl = gl;\n    cache.canvas = canvas;\n    cache.resolutionLocation = gl.getUniformLocation(program, 'u_resolution');\n    cache.positionLocation = gl.getAttribLocation(program, 'a_position');\n    cache.backdropLocation = gl.getUniformLocation(program, 'u_backdrop');\n    cache.subtypeLocation = gl.getUniformLocation(program, 'u_subtype');\n\n    var texCoordLocation = gl.getAttribLocation(program, 'a_texCoord');\n    var texLayerLocation = gl.getUniformLocation(program, 'u_image');\n    var texMaskLocation = gl.getUniformLocation(program, 'u_mask');\n\n    // provide texture coordinates for the rectangle.\n    var texCoordBuffer = gl.createBuffer();\n    gl.bindBuffer(gl.ARRAY_BUFFER, texCoordBuffer);\n    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([\n      0.0, 0.0,\n      1.0, 0.0,\n      0.0, 1.0,\n      0.0, 1.0,\n      1.0, 0.0,\n      1.0, 1.0]), gl.STATIC_DRAW);\n    gl.enableVertexAttribArray(texCoordLocation);\n    gl.vertexAttribPointer(texCoordLocation, 2, gl.FLOAT, false, 0, 0);\n\n    gl.uniform1i(texLayerLocation, 0);\n    gl.uniform1i(texMaskLocation, 1);\n\n    smaskCache = cache;\n  }\n\n  function composeSMask(layer, mask, properties) {\n    var width = layer.width, height = layer.height;\n\n    if (!smaskCache) {\n      initSmaskGL();\n    }\n    var cache = smaskCache, canvas = cache.canvas, gl = cache.gl;\n    canvas.width = width;\n    canvas.height = height;\n    gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight);\n    gl.uniform2f(cache.resolutionLocation, width, height);\n\n    if (properties.backdrop) {\n      gl.uniform4f(cache.resolutionLocation, properties.backdrop[0],\n                   properties.backdrop[1], properties.backdrop[2], 1);\n    } else {\n      gl.uniform4f(cache.resolutionLocation, 0, 0, 0, 0);\n    }\n    gl.uniform1i(cache.subtypeLocation,\n                 properties.subtype === 'Luminosity' ? 1 : 0);\n\n    // Create a textures\n    var texture = createTexture(gl, layer, gl.TEXTURE0);\n    var maskTexture = createTexture(gl, mask, gl.TEXTURE1);\n\n    // Create a buffer and put a single clipspace rectangle in\n    // it (2 triangles)\n    var buffer = gl.createBuffer();\n    gl.bindBuffer(gl.ARRAY_BUFFER, buffer);\n    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([\n      0, 0,\n      width, 0,\n      0, height,\n      0, height,\n      width, 0,\n      width, height]), gl.STATIC_DRAW);\n    gl.enableVertexAttribArray(cache.positionLocation);\n    gl.vertexAttribPointer(cache.positionLocation, 2, gl.FLOAT, false, 0, 0);\n\n    // draw\n    gl.clearColor(0, 0, 0, 0);\n    gl.enable(gl.BLEND);\n    gl.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA);\n    gl.clear(gl.COLOR_BUFFER_BIT);\n\n    gl.drawArrays(gl.TRIANGLES, 0, 6);\n\n    gl.flush();\n\n    gl.deleteTexture(texture);\n    gl.deleteTexture(maskTexture);\n    gl.deleteBuffer(buffer);\n\n    return canvas;\n  }\n\n  var figuresVertexShaderCode = '\\\n  attribute vec2 a_position;                                    \\\n  attribute vec3 a_color;                                       \\\n                                                                \\\n  uniform vec2 u_resolution;                                    \\\n  uniform vec2 u_scale;                                         \\\n  uniform vec2 u_offset;                                        \\\n                                                                \\\n  varying vec4 v_color;                                         \\\n                                                                \\\n  void main() {                                                 \\\n    vec2 position = (a_position + u_offset) * u_scale;          \\\n    vec2 clipSpace = (position / u_resolution) * 2.0 - 1.0;     \\\n    gl_Position = vec4(clipSpace * vec2(1, -1), 0, 1);          \\\n                                                                \\\n    v_color = vec4(a_color / 255.0, 1.0);                       \\\n  }                                                             ';\n\n  var figuresFragmentShaderCode = '\\\n  precision mediump float;                                      \\\n                                                                \\\n  varying vec4 v_color;                                         \\\n                                                                \\\n  void main() {                                                 \\\n    gl_FragColor = v_color;                                     \\\n  }                                                             ';\n\n  var figuresCache = null;\n\n  function initFiguresGL() {\n    var canvas, gl;\n\n    generateGL();\n    canvas = currentCanvas;\n    currentCanvas = null;\n    gl = currentGL;\n    currentGL = null;\n\n    // setup a GLSL program\n    var vertexShader = createVertexShader(gl, figuresVertexShaderCode);\n    var fragmentShader = createFragmentShader(gl, figuresFragmentShaderCode);\n    var program = createProgram(gl, [vertexShader, fragmentShader]);\n    gl.useProgram(program);\n\n    var cache = {};\n    cache.gl = gl;\n    cache.canvas = canvas;\n    cache.resolutionLocation = gl.getUniformLocation(program, 'u_resolution');\n    cache.scaleLocation = gl.getUniformLocation(program, 'u_scale');\n    cache.offsetLocation = gl.getUniformLocation(program, 'u_offset');\n    cache.positionLocation = gl.getAttribLocation(program, 'a_position');\n    cache.colorLocation = gl.getAttribLocation(program, 'a_color');\n\n    figuresCache = cache;\n  }\n\n  function drawFigures(width, height, backgroundColor, figures, context) {\n    if (!figuresCache) {\n      initFiguresGL();\n    }\n    var cache = figuresCache, canvas = cache.canvas, gl = cache.gl;\n\n    canvas.width = width;\n    canvas.height = height;\n    gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight);\n    gl.uniform2f(cache.resolutionLocation, width, height);\n\n    // count triangle points\n    var count = 0;\n    var i, ii, rows;\n    for (i = 0, ii = figures.length; i < ii; i++) {\n      switch (figures[i].type) {\n        case 'lattice':\n          rows = (figures[i].coords.length / figures[i].verticesPerRow) | 0;\n          count += (rows - 1) * (figures[i].verticesPerRow - 1) * 6;\n          break;\n        case 'triangles':\n          count += figures[i].coords.length;\n          break;\n      }\n    }\n    // transfer data\n    var coords = new Float32Array(count * 2);\n    var colors = new Uint8Array(count * 3);\n    var coordsMap = context.coords, colorsMap = context.colors;\n    var pIndex = 0, cIndex = 0;\n    for (i = 0, ii = figures.length; i < ii; i++) {\n      var figure = figures[i], ps = figure.coords, cs = figure.colors;\n      switch (figure.type) {\n        case 'lattice':\n          var cols = figure.verticesPerRow;\n          rows = (ps.length / cols) | 0;\n          for (var row = 1; row < rows; row++) {\n            var offset = row * cols + 1;\n            for (var col = 1; col < cols; col++, offset++) {\n              coords[pIndex] = coordsMap[ps[offset - cols - 1]];\n              coords[pIndex + 1] = coordsMap[ps[offset - cols - 1] + 1];\n              coords[pIndex + 2] = coordsMap[ps[offset - cols]];\n              coords[pIndex + 3] = coordsMap[ps[offset - cols] + 1];\n              coords[pIndex + 4] = coordsMap[ps[offset - 1]];\n              coords[pIndex + 5] = coordsMap[ps[offset - 1] + 1];\n              colors[cIndex] = colorsMap[cs[offset - cols - 1]];\n              colors[cIndex + 1] = colorsMap[cs[offset - cols - 1] + 1];\n              colors[cIndex + 2] = colorsMap[cs[offset - cols - 1] + 2];\n              colors[cIndex + 3] = colorsMap[cs[offset - cols]];\n              colors[cIndex + 4] = colorsMap[cs[offset - cols] + 1];\n              colors[cIndex + 5] = colorsMap[cs[offset - cols] + 2];\n              colors[cIndex + 6] = colorsMap[cs[offset - 1]];\n              colors[cIndex + 7] = colorsMap[cs[offset - 1] + 1];\n              colors[cIndex + 8] = colorsMap[cs[offset - 1] + 2];\n\n              coords[pIndex + 6] = coords[pIndex + 2];\n              coords[pIndex + 7] = coords[pIndex + 3];\n              coords[pIndex + 8] = coords[pIndex + 4];\n              coords[pIndex + 9] = coords[pIndex + 5];\n              coords[pIndex + 10] = coordsMap[ps[offset]];\n              coords[pIndex + 11] = coordsMap[ps[offset] + 1];\n              colors[cIndex + 9] = colors[cIndex + 3];\n              colors[cIndex + 10] = colors[cIndex + 4];\n              colors[cIndex + 11] = colors[cIndex + 5];\n              colors[cIndex + 12] = colors[cIndex + 6];\n              colors[cIndex + 13] = colors[cIndex + 7];\n              colors[cIndex + 14] = colors[cIndex + 8];\n              colors[cIndex + 15] = colorsMap[cs[offset]];\n              colors[cIndex + 16] = colorsMap[cs[offset] + 1];\n              colors[cIndex + 17] = colorsMap[cs[offset] + 2];\n              pIndex += 12;\n              cIndex += 18;\n            }\n          }\n          break;\n        case 'triangles':\n          for (var j = 0, jj = ps.length; j < jj; j++) {\n            coords[pIndex] = coordsMap[ps[j]];\n            coords[pIndex + 1] = coordsMap[ps[j] + 1];\n            colors[cIndex] = colorsMap[cs[j]];\n            colors[cIndex + 1] = colorsMap[cs[j] + 1];\n            colors[cIndex + 2] = colorsMap[cs[j] + 2];\n            pIndex += 2;\n            cIndex += 3;\n          }\n          break;\n      }\n    }\n\n    // draw\n    if (backgroundColor) {\n      gl.clearColor(backgroundColor[0] / 255, backgroundColor[1] / 255,\n                    backgroundColor[2] / 255, 1.0);\n    } else {\n      gl.clearColor(0, 0, 0, 0);\n    }\n    gl.clear(gl.COLOR_BUFFER_BIT);\n\n    var coordsBuffer = gl.createBuffer();\n    gl.bindBuffer(gl.ARRAY_BUFFER, coordsBuffer);\n    gl.bufferData(gl.ARRAY_BUFFER, coords, gl.STATIC_DRAW);\n    gl.enableVertexAttribArray(cache.positionLocation);\n    gl.vertexAttribPointer(cache.positionLocation, 2, gl.FLOAT, false, 0, 0);\n\n    var colorsBuffer = gl.createBuffer();\n    gl.bindBuffer(gl.ARRAY_BUFFER, colorsBuffer);\n    gl.bufferData(gl.ARRAY_BUFFER, colors, gl.STATIC_DRAW);\n    gl.enableVertexAttribArray(cache.colorLocation);\n    gl.vertexAttribPointer(cache.colorLocation, 3, gl.UNSIGNED_BYTE, false,\n                           0, 0);\n\n    gl.uniform2f(cache.scaleLocation, context.scaleX, context.scaleY);\n    gl.uniform2f(cache.offsetLocation, context.offsetX, context.offsetY);\n\n    gl.drawArrays(gl.TRIANGLES, 0, count);\n\n    gl.flush();\n\n    gl.deleteBuffer(coordsBuffer);\n    gl.deleteBuffer(colorsBuffer);\n\n    return canvas;\n  }\n\n  return {\n    tryInitGL() {\n      try {\n        generateGL();\n        return !!currentGL;\n      } catch (ex) { }\n      return false;\n    },\n\n    composeSMask,\n\n    drawFigures,\n\n    cleanup() {\n      if (smaskCache && smaskCache.canvas) {\n        smaskCache.canvas.width = 0;\n        smaskCache.canvas.height = 0;\n      }\n      if (figuresCache && figuresCache.canvas) {\n        figuresCache.canvas.width = 0;\n        figuresCache.canvas.height = 0;\n      }\n      smaskCache = null;\n      figuresCache = null;\n    },\n  };\n})();\n\nexport {\n  WebGLContext,\n};\n","/* Copyright 2015 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { AbortException, createPromiseCapability, Util } from '../shared/util';\nimport globalScope from '../shared/global_scope';\n\n/**\n * Text layer render parameters.\n *\n * @typedef {Object} TextLayerRenderParameters\n * @property {TextContent} textContent - (optional) Text content to render\n *   (the object is returned by the page's getTextContent() method).\n * @property {ReadableStream} textContentStream - (optional) Text content\n *   stream to render (the stream is returned by the page's\n *   streamTextContent() method).\n * @property {HTMLElement} container - HTML element that will contain text runs.\n * @property {PageViewport} viewport - The target viewport to properly\n *   layout the text runs.\n * @property {Array} textDivs - (optional) HTML elements that are correspond\n *   the text items of the textContent input. This is output and shall be\n *   initially be set to empty array.\n * @property {Array} textContentItemsStr - (optional) Strings that correspond\n *   the `str` property of the text items of textContent input. This is output\n *   and shall be initially be set to empty array.\n * @property {number} timeout - (optional) Delay in milliseconds before\n *   rendering of the text  runs occurs.\n * @property {boolean} enhanceTextSelection - (optional) Whether to turn on the\n *   text selection enhancement.\n */\nvar renderTextLayer = (function renderTextLayerClosure() {\n  var MAX_TEXT_DIVS_TO_RENDER = 100000;\n\n  var NonWhitespaceRegexp = /\\S/;\n\n  function isAllWhitespace(str) {\n    return !NonWhitespaceRegexp.test(str);\n  }\n\n  // Text layers may contain many thousands of divs, and using `styleBuf` avoids\n  // creating many intermediate strings when building their 'style' properties.\n  var styleBuf = ['left: ', 0, 'px; top: ', 0, 'px; font-size: ', 0,\n                  'px; font-family: ', '', ';'];\n\n  function appendText(task, geom, styles) {\n    // Initialize all used properties to keep the caches monomorphic.\n    var textDiv = document.createElement('span');\n    var textDivProperties = {\n      style: null,\n      angle: 0,\n      canvasWidth: 0,\n      isWhitespace: false,\n      originalTransform: null,\n      paddingBottom: 0,\n      paddingLeft: 0,\n      paddingRight: 0,\n      paddingTop: 0,\n      scale: 1,\n    };\n\n    task._textDivs.push(textDiv);\n    if (isAllWhitespace(geom.str)) {\n      textDivProperties.isWhitespace = true;\n      task._textDivProperties.set(textDiv, textDivProperties);\n      return;\n    }\n\n    var tx = Util.transform(task._viewport.transform, geom.transform);\n    var angle = Math.atan2(tx[1], tx[0]);\n    var style = styles[geom.fontName];\n    if (style.vertical) {\n      angle += Math.PI / 2;\n    }\n    var fontHeight = Math.sqrt((tx[2] * tx[2]) + (tx[3] * tx[3]));\n    var fontAscent = fontHeight;\n    if (style.ascent) {\n      fontAscent = style.ascent * fontAscent;\n    } else if (style.descent) {\n      fontAscent = (1 + style.descent) * fontAscent;\n    }\n\n    var left;\n    var top;\n    if (angle === 0) {\n      left = tx[4];\n      top = tx[5] - fontAscent;\n    } else {\n      left = tx[4] + (fontAscent * Math.sin(angle));\n      top = tx[5] - (fontAscent * Math.cos(angle));\n    }\n    styleBuf[1] = left;\n    styleBuf[3] = top;\n    styleBuf[5] = fontHeight;\n    styleBuf[7] = style.fontFamily;\n    textDivProperties.style = styleBuf.join('');\n    textDiv.setAttribute('style', textDivProperties.style);\n\n    textDiv.textContent = geom.str;\n    // `fontName` is only used by the FontInspector, and we only use `dataset`\n    // here to make the font name available in the debugger.\n    if (task._fontInspectorEnabled) {\n      textDiv.dataset.fontName = geom.fontName;\n    }\n    if (angle !== 0) {\n      textDivProperties.angle = angle * (180 / Math.PI);\n    }\n    // We don't bother scaling single-char text divs, because it has very\n    // little effect on text highlighting. This makes scrolling on docs with\n    // lots of such divs a lot faster.\n    if (geom.str.length > 1) {\n      if (style.vertical) {\n        textDivProperties.canvasWidth = geom.height * task._viewport.scale;\n      } else {\n        textDivProperties.canvasWidth = geom.width * task._viewport.scale;\n      }\n    }\n    task._textDivProperties.set(textDiv, textDivProperties);\n    if (task._textContentStream) {\n      task._layoutText(textDiv);\n    }\n\n    if (task._enhanceTextSelection) {\n      var angleCos = 1, angleSin = 0;\n      if (angle !== 0) {\n        angleCos = Math.cos(angle);\n        angleSin = Math.sin(angle);\n      }\n      var divWidth = (style.vertical ? geom.height : geom.width) *\n                     task._viewport.scale;\n      var divHeight = fontHeight;\n\n      var m, b;\n      if (angle !== 0) {\n        m = [angleCos, angleSin, -angleSin, angleCos, left, top];\n        b = Util.getAxialAlignedBoundingBox([0, 0, divWidth, divHeight], m);\n      } else {\n        b = [left, top, left + divWidth, top + divHeight];\n      }\n\n      task._bounds.push({\n        left: b[0],\n        top: b[1],\n        right: b[2],\n        bottom: b[3],\n        div: textDiv,\n        size: [divWidth, divHeight],\n        m,\n      });\n    }\n  }\n\n  function render(task) {\n    if (task._canceled) {\n      return;\n    }\n    var textDivs = task._textDivs;\n    var capability = task._capability;\n    var textDivsLength = textDivs.length;\n\n    // No point in rendering many divs as it would make the browser\n    // unusable even after the divs are rendered.\n    if (textDivsLength > MAX_TEXT_DIVS_TO_RENDER) {\n      task._renderingDone = true;\n      capability.resolve();\n      return;\n    }\n\n    if (!task._textContentStream) {\n      for (var i = 0; i < textDivsLength; i++) {\n        task._layoutText(textDivs[i]);\n      }\n    }\n\n    task._renderingDone = true;\n    capability.resolve();\n  }\n\n  function expand(task) {\n    var bounds = task._bounds;\n    var viewport = task._viewport;\n\n    var expanded = expandBounds(viewport.width, viewport.height, bounds);\n    for (var i = 0; i < expanded.length; i++) {\n      var div = bounds[i].div;\n      var divProperties = task._textDivProperties.get(div);\n      if (divProperties.angle === 0) {\n        divProperties.paddingLeft = bounds[i].left - expanded[i].left;\n        divProperties.paddingTop = bounds[i].top - expanded[i].top;\n        divProperties.paddingRight = expanded[i].right - bounds[i].right;\n        divProperties.paddingBottom = expanded[i].bottom - bounds[i].bottom;\n        task._textDivProperties.set(div, divProperties);\n        continue;\n      }\n      // Box is rotated -- trying to find padding so rotated div will not\n      // exceed its expanded bounds.\n      var e = expanded[i], b = bounds[i];\n      var m = b.m, c = m[0], s = m[1];\n      // Finding intersections with expanded box.\n      var points = [[0, 0], [0, b.size[1]], [b.size[0], 0], b.size];\n      var ts = new Float64Array(64);\n      points.forEach(function (p, i) {\n        var t = Util.applyTransform(p, m);\n        ts[i + 0] = c && (e.left - t[0]) / c;\n        ts[i + 4] = s && (e.top - t[1]) / s;\n        ts[i + 8] = c && (e.right - t[0]) / c;\n        ts[i + 12] = s && (e.bottom - t[1]) / s;\n\n        ts[i + 16] = s && (e.left - t[0]) / -s;\n        ts[i + 20] = c && (e.top - t[1]) / c;\n        ts[i + 24] = s && (e.right - t[0]) / -s;\n        ts[i + 28] = c && (e.bottom - t[1]) / c;\n\n        ts[i + 32] = c && (e.left - t[0]) / -c;\n        ts[i + 36] = s && (e.top - t[1]) / -s;\n        ts[i + 40] = c && (e.right - t[0]) / -c;\n        ts[i + 44] = s && (e.bottom - t[1]) / -s;\n\n        ts[i + 48] = s && (e.left - t[0]) / s;\n        ts[i + 52] = c && (e.top - t[1]) / -c;\n        ts[i + 56] = s && (e.right - t[0]) / s;\n        ts[i + 60] = c && (e.bottom - t[1]) / -c;\n      });\n      var findPositiveMin = function (ts, offset, count) {\n        var result = 0;\n        for (var i = 0; i < count; i++) {\n          var t = ts[offset++];\n          if (t > 0) {\n            result = result ? Math.min(t, result) : t;\n          }\n        }\n        return result;\n      };\n      // Not based on math, but to simplify calculations, using cos and sin\n      // absolute values to not exceed the box (it can but insignificantly).\n      var boxScale = 1 + Math.min(Math.abs(c), Math.abs(s));\n      divProperties.paddingLeft = findPositiveMin(ts, 32, 16) / boxScale;\n      divProperties.paddingTop = findPositiveMin(ts, 48, 16) / boxScale;\n      divProperties.paddingRight = findPositiveMin(ts, 0, 16) / boxScale;\n      divProperties.paddingBottom = findPositiveMin(ts, 16, 16) / boxScale;\n      task._textDivProperties.set(div, divProperties);\n    }\n  }\n\n  function expandBounds(width, height, boxes) {\n    var bounds = boxes.map(function (box, i) {\n      return {\n        x1: box.left,\n        y1: box.top,\n        x2: box.right,\n        y2: box.bottom,\n        index: i,\n        x1New: undefined,\n        x2New: undefined,\n      };\n    });\n    expandBoundsLTR(width, bounds);\n    var expanded = new Array(boxes.length);\n    bounds.forEach(function (b) {\n      var i = b.index;\n      expanded[i] = {\n        left: b.x1New,\n        top: 0,\n        right: b.x2New,\n        bottom: 0,\n      };\n    });\n\n    // Rotating on 90 degrees and extending extended boxes. Reusing the bounds\n    // array and objects.\n    boxes.map(function (box, i) {\n      var e = expanded[i], b = bounds[i];\n      b.x1 = box.top;\n      b.y1 = width - e.right;\n      b.x2 = box.bottom;\n      b.y2 = width - e.left;\n      b.index = i;\n      b.x1New = undefined;\n      b.x2New = undefined;\n    });\n    expandBoundsLTR(height, bounds);\n\n    bounds.forEach(function (b) {\n      var i = b.index;\n      expanded[i].top = b.x1New;\n      expanded[i].bottom = b.x2New;\n    });\n    return expanded;\n  }\n\n  function expandBoundsLTR(width, bounds) {\n    // Sorting by x1 coordinate and walk by the bounds in the same order.\n    bounds.sort(function (a, b) {\n      return a.x1 - b.x1 || a.index - b.index;\n    });\n\n    // First we see on the horizon is a fake boundary.\n    var fakeBoundary = {\n      x1: -Infinity,\n      y1: -Infinity,\n      x2: 0,\n      y2: Infinity,\n      index: -1,\n      x1New: 0,\n      x2New: 0,\n    };\n    var horizon = [{\n      start: -Infinity,\n      end: Infinity,\n      boundary: fakeBoundary,\n    }];\n\n    bounds.forEach(function (boundary) {\n      // Searching for the affected part of horizon.\n      // TODO red-black tree or simple binary search\n      var i = 0;\n      while (i < horizon.length && horizon[i].end <= boundary.y1) {\n        i++;\n      }\n      var j = horizon.length - 1;\n      while (j >= 0 && horizon[j].start >= boundary.y2) {\n        j--;\n      }\n\n      var horizonPart, affectedBoundary;\n      var q, k, maxXNew = -Infinity;\n      for (q = i; q <= j; q++) {\n        horizonPart = horizon[q];\n        affectedBoundary = horizonPart.boundary;\n        var xNew;\n        if (affectedBoundary.x2 > boundary.x1) {\n          // In the middle of the previous element, new x shall be at the\n          // boundary start. Extending if further if the affected boundary\n          // placed on top of the current one.\n          xNew = affectedBoundary.index > boundary.index ?\n            affectedBoundary.x1New : boundary.x1;\n        } else if (affectedBoundary.x2New === undefined) {\n          // We have some space in between, new x in middle will be a fair\n          // choice.\n          xNew = (affectedBoundary.x2 + boundary.x1) / 2;\n        } else {\n          // Affected boundary has x2new set, using it as new x.\n          xNew = affectedBoundary.x2New;\n        }\n        if (xNew > maxXNew) {\n          maxXNew = xNew;\n        }\n      }\n\n      // Set new x1 for current boundary.\n      boundary.x1New = maxXNew;\n\n      // Adjusts new x2 for the affected boundaries.\n      for (q = i; q <= j; q++) {\n        horizonPart = horizon[q];\n        affectedBoundary = horizonPart.boundary;\n        if (affectedBoundary.x2New === undefined) {\n          // Was not set yet, choosing new x if possible.\n          if (affectedBoundary.x2 > boundary.x1) {\n            // Current and affected boundaries intersect. If affected boundary\n            // is placed on top of the current, shrinking the affected.\n            if (affectedBoundary.index > boundary.index) {\n              affectedBoundary.x2New = affectedBoundary.x2;\n            }\n          } else {\n            affectedBoundary.x2New = maxXNew;\n          }\n        } else if (affectedBoundary.x2New > maxXNew) {\n          // Affected boundary is touching new x, pushing it back.\n          affectedBoundary.x2New = Math.max(maxXNew, affectedBoundary.x2);\n        }\n      }\n\n      // Fixing the horizon.\n      var changedHorizon = [], lastBoundary = null;\n      for (q = i; q <= j; q++) {\n        horizonPart = horizon[q];\n        affectedBoundary = horizonPart.boundary;\n        // Checking which boundary will be visible.\n        var useBoundary = affectedBoundary.x2 > boundary.x2 ?\n          affectedBoundary : boundary;\n        if (lastBoundary === useBoundary) {\n          // Merging with previous.\n          changedHorizon[changedHorizon.length - 1].end = horizonPart.end;\n        } else {\n          changedHorizon.push({\n            start: horizonPart.start,\n            end: horizonPart.end,\n            boundary: useBoundary,\n          });\n          lastBoundary = useBoundary;\n        }\n      }\n      if (horizon[i].start < boundary.y1) {\n        changedHorizon[0].start = boundary.y1;\n        changedHorizon.unshift({\n          start: horizon[i].start,\n          end: boundary.y1,\n          boundary: horizon[i].boundary,\n        });\n      }\n      if (boundary.y2 < horizon[j].end) {\n        changedHorizon[changedHorizon.length - 1].end = boundary.y2;\n        changedHorizon.push({\n          start: boundary.y2,\n          end: horizon[j].end,\n          boundary: horizon[j].boundary,\n        });\n      }\n\n      // Set x2 new of boundary that is no longer visible (see overlapping case\n      // above).\n      // TODO more efficient, e.g. via reference counting.\n      for (q = i; q <= j; q++) {\n        horizonPart = horizon[q];\n        affectedBoundary = horizonPart.boundary;\n        if (affectedBoundary.x2New !== undefined) {\n          continue;\n        }\n        var used = false;\n        for (k = i - 1; !used && k >= 0 &&\n        horizon[k].start >= affectedBoundary.y1; k--) {\n          used = horizon[k].boundary === affectedBoundary;\n        }\n        for (k = j + 1; !used && k < horizon.length &&\n        horizon[k].end <= affectedBoundary.y2; k++) {\n          used = horizon[k].boundary === affectedBoundary;\n        }\n        for (k = 0; !used && k < changedHorizon.length; k++) {\n          used = changedHorizon[k].boundary === affectedBoundary;\n        }\n        if (!used) {\n          affectedBoundary.x2New = maxXNew;\n        }\n      }\n\n      Array.prototype.splice.apply(horizon,\n        [i, j - i + 1].concat(changedHorizon));\n    });\n\n    // Set new x2 for all unset boundaries.\n    horizon.forEach(function (horizonPart) {\n      var affectedBoundary = horizonPart.boundary;\n      if (affectedBoundary.x2New === undefined) {\n        affectedBoundary.x2New = Math.max(width, affectedBoundary.x2);\n      }\n    });\n  }\n\n  /**\n   * Text layer rendering task.\n   *\n   * @param {TextContent} textContent\n   * @param {HTMLElement} container\n   * @param {PageViewport} viewport\n   * @param {Array} textDivs\n   * @param {boolean} enhanceTextSelection\n   * @private\n   */\n  function TextLayerRenderTask({ textContent, textContentStream, container,\n                                 viewport, textDivs, textContentItemsStr,\n                                 enhanceTextSelection, }) {\n    this._textContent = textContent;\n    this._textContentStream = textContentStream;\n    this._container = container;\n    this._viewport = viewport;\n    this._textDivs = textDivs || [];\n    this._textContentItemsStr = textContentItemsStr || [];\n    this._enhanceTextSelection = !!enhanceTextSelection;\n    this._fontInspectorEnabled = !!(globalScope.FontInspector &&\n                                    globalScope.FontInspector.enabled);\n\n    this._reader = null;\n    this._layoutTextLastFontSize = null;\n    this._layoutTextLastFontFamily = null;\n    this._layoutTextCtx = null;\n    this._textDivProperties = new WeakMap();\n    this._renderingDone = false;\n    this._canceled = false;\n    this._capability = createPromiseCapability();\n    this._renderTimer = null;\n    this._bounds = [];\n  }\n  TextLayerRenderTask.prototype = {\n    get promise() {\n      return this._capability.promise;\n    },\n\n    cancel: function TextLayer_cancel() {\n      if (this._reader) {\n        this._reader.cancel(new AbortException('text layer task cancelled'));\n        this._reader = null;\n      }\n      this._canceled = true;\n      if (this._renderTimer !== null) {\n        clearTimeout(this._renderTimer);\n        this._renderTimer = null;\n      }\n      this._capability.reject('canceled');\n    },\n\n    _processItems(items, styleCache) {\n      for (let i = 0, len = items.length; i < len; i++) {\n        this._textContentItemsStr.push(items[i].str);\n        appendText(this, items[i], styleCache);\n      }\n    },\n\n    _layoutText(textDiv) {\n      let textLayerFrag = this._container;\n\n      let textDivProperties = this._textDivProperties.get(textDiv);\n      if (textDivProperties.isWhitespace) {\n        return;\n      }\n\n      let fontSize = textDiv.style.fontSize;\n      let fontFamily = textDiv.style.fontFamily;\n\n      // Only build font string and set to context if different from last.\n      if (fontSize !== this._layoutTextLastFontSize ||\n          fontFamily !== this._layoutTextLastFontFamily) {\n        this._layoutTextCtx.font = fontSize + ' ' + fontFamily;\n        this._layoutTextLastFontSize = fontSize;\n        this._layoutTextLastFontFamily = fontFamily;\n      }\n\n      let width = this._layoutTextCtx.measureText(textDiv.textContent).width;\n\n      let transform = '';\n      if (textDivProperties.canvasWidth !== 0 && width > 0) {\n        textDivProperties.scale = textDivProperties.canvasWidth / width;\n        transform = `scaleX(${textDivProperties.scale})`;\n      }\n      if (textDivProperties.angle !== 0) {\n        transform = `rotate(${textDivProperties.angle}deg) ${transform}`;\n      }\n      if (transform.length > 0) {\n        textDivProperties.originalTransform = transform;\n        textDiv.style.transform = transform;\n      }\n      this._textDivProperties.set(textDiv, textDivProperties);\n      textLayerFrag.appendChild(textDiv);\n    },\n\n    _render: function TextLayer_render(timeout) {\n      let capability = createPromiseCapability();\n      let styleCache = Object.create(null);\n\n      // The temporary canvas is used to measure text length in the DOM.\n      let canvas = document.createElement('canvas');\n      if (typeof PDFJSDev === 'undefined' ||\n          PDFJSDev.test('FIREFOX || MOZCENTRAL || GENERIC')) {\n         canvas.mozOpaque = true;\n      }\n      this._layoutTextCtx = canvas.getContext('2d', { alpha: false, });\n\n      if (this._textContent) {\n        let textItems = this._textContent.items;\n        let textStyles = this._textContent.styles;\n        this._processItems(textItems, textStyles);\n        capability.resolve();\n      } else if (this._textContentStream) {\n        let pump = () => {\n          this._reader.read().then(({ value, done, }) => {\n            if (done) {\n              capability.resolve();\n              return;\n            }\n\n            Object.assign(styleCache, value.styles);\n            this._processItems(value.items, styleCache);\n            pump();\n          }, capability.reject);\n        };\n\n        this._reader = this._textContentStream.getReader();\n        pump();\n      } else {\n        throw new Error('Neither \"textContent\" nor \"textContentStream\"' +\n          ' parameters specified.');\n      }\n\n      capability.promise.then(() => {\n        styleCache = null;\n        if (!timeout) { // Render right away\n          render(this);\n        } else { // Schedule\n          this._renderTimer = setTimeout(() => {\n            render(this);\n            this._renderTimer = null;\n          }, timeout);\n        }\n      }, this._capability.reject);\n    },\n\n    expandTextDivs: function TextLayer_expandTextDivs(expandDivs) {\n      if (!this._enhanceTextSelection || !this._renderingDone) {\n        return;\n      }\n      if (this._bounds !== null) {\n        expand(this);\n        this._bounds = null;\n      }\n\n      for (var i = 0, ii = this._textDivs.length; i < ii; i++) {\n        var div = this._textDivs[i];\n        var divProperties = this._textDivProperties.get(div);\n\n        if (divProperties.isWhitespace) {\n          continue;\n        }\n        if (expandDivs) {\n          var transform = '', padding = '';\n\n          if (divProperties.scale !== 1) {\n            transform = 'scaleX(' + divProperties.scale + ')';\n          }\n          if (divProperties.angle !== 0) {\n            transform = 'rotate(' + divProperties.angle + 'deg) ' + transform;\n          }\n          if (divProperties.paddingLeft !== 0) {\n            padding += ' padding-left: ' +\n              (divProperties.paddingLeft / divProperties.scale) + 'px;';\n            transform += ' translateX(' +\n              (-divProperties.paddingLeft / divProperties.scale) + 'px)';\n          }\n          if (divProperties.paddingTop !== 0) {\n            padding += ' padding-top: ' + divProperties.paddingTop + 'px;';\n            transform += ' translateY(' + (-divProperties.paddingTop) + 'px)';\n          }\n          if (divProperties.paddingRight !== 0) {\n            padding += ' padding-right: ' +\n              (divProperties.paddingRight / divProperties.scale) + 'px;';\n          }\n          if (divProperties.paddingBottom !== 0) {\n            padding += ' padding-bottom: ' +\n              divProperties.paddingBottom + 'px;';\n          }\n\n          if (padding !== '') {\n            div.setAttribute('style', divProperties.style + padding);\n          }\n          if (transform !== '') {\n            div.style.transform = transform;\n          }\n        } else {\n          div.style.padding = 0;\n          div.style.transform = divProperties.originalTransform || '';\n        }\n      }\n    },\n  };\n\n  /**\n   * Starts rendering of the text layer.\n   *\n   * @param {TextLayerRenderParameters} renderParameters\n   * @returns {TextLayerRenderTask}\n   */\n  function renderTextLayer(renderParameters) {\n    var task = new TextLayerRenderTask({\n      textContent: renderParameters.textContent,\n      textContentStream: renderParameters.textContentStream,\n      container: renderParameters.container,\n      viewport: renderParameters.viewport,\n      textDivs: renderParameters.textDivs,\n      textContentItemsStr: renderParameters.textContentItemsStr,\n      enhanceTextSelection: renderParameters.enhanceTextSelection,\n    });\n    task._render(renderParameters.timeout);\n    return task;\n  }\n\n  return renderTextLayer;\n})();\n\nexport {\n  renderTextLayer,\n};\n","/* Copyright 2014 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport {\n  addLinkAttributes, DOMSVGFactory, getFilenameFromUrl, LinkTarget\n} from './dom_utils';\nimport {\n  AnnotationBorderStyleType, AnnotationType, stringToPDFString, unreachable,\n  Util, warn\n} from '../shared/util';\n\n/**\n * @typedef {Object} AnnotationElementParameters\n * @property {Object} data\n * @property {HTMLDivElement} layer\n * @property {PDFPage} page\n * @property {PageViewport} viewport\n * @property {IPDFLinkService} linkService\n * @property {DownloadManager} downloadManager\n * @property {string} imageResourcesPath - (optional) Path for image resources,\n *   mainly for annotation icons. Include trailing slash.\n * @property {boolean} renderInteractiveForms\n * @property {Object} svgFactory\n */\n\nclass AnnotationElementFactory {\n  /**\n   * @param {AnnotationElementParameters} parameters\n   * @returns {AnnotationElement}\n   */\n  static create(parameters) {\n    let subtype = parameters.data.annotationType;\n\n    switch (subtype) {\n      case AnnotationType.LINK:\n        return new LinkAnnotationElement(parameters);\n\n      case AnnotationType.TEXT:\n        return new TextAnnotationElement(parameters);\n\n      case AnnotationType.WIDGET:\n        let fieldType = parameters.data.fieldType;\n\n        switch (fieldType) {\n          case 'Tx':\n            return new TextWidgetAnnotationElement(parameters);\n          case 'Btn':\n            if (parameters.data.radioButton) {\n              return new RadioButtonWidgetAnnotationElement(parameters);\n            } else if (parameters.data.checkBox) {\n              return new CheckboxWidgetAnnotationElement(parameters);\n            }\n            return new PushButtonWidgetAnnotationElement(parameters);\n          case 'Ch':\n            return new ChoiceWidgetAnnotationElement(parameters);\n        }\n        return new WidgetAnnotationElement(parameters);\n\n      case AnnotationType.POPUP:\n        return new PopupAnnotationElement(parameters);\n\n      case AnnotationType.LINE:\n        return new LineAnnotationElement(parameters);\n\n      case AnnotationType.SQUARE:\n        return new SquareAnnotationElement(parameters);\n\n      case AnnotationType.CIRCLE:\n        return new CircleAnnotationElement(parameters);\n\n      case AnnotationType.POLYLINE:\n        return new PolylineAnnotationElement(parameters);\n\n      case AnnotationType.INK:\n        return new InkAnnotationElement(parameters);\n\n      case AnnotationType.POLYGON:\n        return new PolygonAnnotationElement(parameters);\n\n      case AnnotationType.HIGHLIGHT:\n        return new HighlightAnnotationElement(parameters);\n\n      case AnnotationType.UNDERLINE:\n        return new UnderlineAnnotationElement(parameters);\n\n      case AnnotationType.SQUIGGLY:\n        return new SquigglyAnnotationElement(parameters);\n\n      case AnnotationType.STRIKEOUT:\n        return new StrikeOutAnnotationElement(parameters);\n\n      case AnnotationType.STAMP:\n        return new StampAnnotationElement(parameters);\n\n      case AnnotationType.FILEATTACHMENT:\n        return new FileAttachmentAnnotationElement(parameters);\n\n      default:\n        return new AnnotationElement(parameters);\n    }\n  }\n}\n\nclass AnnotationElement {\n  constructor(parameters, isRenderable = false, ignoreBorder = false) {\n    this.isRenderable = isRenderable;\n    this.data = parameters.data;\n    this.layer = parameters.layer;\n    this.page = parameters.page;\n    this.viewport = parameters.viewport;\n    this.linkService = parameters.linkService;\n    this.downloadManager = parameters.downloadManager;\n    this.imageResourcesPath = parameters.imageResourcesPath;\n    this.renderInteractiveForms = parameters.renderInteractiveForms;\n    this.svgFactory = parameters.svgFactory;\n\n    if (isRenderable) {\n      this.container = this._createContainer(ignoreBorder);\n    }\n  }\n\n  /**\n   * Create an empty container for the annotation's HTML element.\n   *\n   * @private\n   * @param {boolean} ignoreBorder\n   * @memberof AnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  _createContainer(ignoreBorder = false) {\n    let data = this.data, page = this.page, viewport = this.viewport;\n    let container = document.createElement('section');\n    let width = data.rect[2] - data.rect[0];\n    let height = data.rect[3] - data.rect[1];\n\n    container.setAttribute('data-annotation-id', data.id);\n\n    // Do *not* modify `data.rect`, since that will corrupt the annotation\n    // position on subsequent calls to `_createContainer` (see issue 6804).\n    let rect = Util.normalizeRect([\n      data.rect[0],\n      page.view[3] - data.rect[1] + page.view[1],\n      data.rect[2],\n      page.view[3] - data.rect[3] + page.view[1]\n    ]);\n\n    container.style.transform = 'matrix(' + viewport.transform.join(',') + ')';\n    container.style.transformOrigin = -rect[0] + 'px ' + -rect[1] + 'px';\n\n    if (!ignoreBorder && data.borderStyle.width > 0) {\n      container.style.borderWidth = data.borderStyle.width + 'px';\n      if (data.borderStyle.style !== AnnotationBorderStyleType.UNDERLINE) {\n        // Underline styles only have a bottom border, so we do not need\n        // to adjust for all borders. This yields a similar result as\n        // Adobe Acrobat/Reader.\n        width = width - 2 * data.borderStyle.width;\n        height = height - 2 * data.borderStyle.width;\n      }\n\n      let horizontalRadius = data.borderStyle.horizontalCornerRadius;\n      let verticalRadius = data.borderStyle.verticalCornerRadius;\n      if (horizontalRadius > 0 || verticalRadius > 0) {\n        let radius = horizontalRadius + 'px / ' + verticalRadius + 'px';\n        container.style.borderRadius = radius;\n      }\n\n      switch (data.borderStyle.style) {\n        case AnnotationBorderStyleType.SOLID:\n          container.style.borderStyle = 'solid';\n          break;\n\n        case AnnotationBorderStyleType.DASHED:\n          container.style.borderStyle = 'dashed';\n          break;\n\n        case AnnotationBorderStyleType.BEVELED:\n          warn('Unimplemented border style: beveled');\n          break;\n\n        case AnnotationBorderStyleType.INSET:\n          warn('Unimplemented border style: inset');\n          break;\n\n        case AnnotationBorderStyleType.UNDERLINE:\n          container.style.borderBottomStyle = 'solid';\n          break;\n\n        default:\n          break;\n      }\n\n      if (data.color) {\n        container.style.borderColor = Util.makeCssRgb(data.color[0] | 0,\n                                                      data.color[1] | 0,\n                                                      data.color[2] | 0);\n      } else {\n        // Transparent (invisible) border, so do not draw it at all.\n        container.style.borderWidth = 0;\n      }\n    }\n\n    container.style.left = rect[0] + 'px';\n    container.style.top = rect[1] + 'px';\n\n    container.style.width = width + 'px';\n    container.style.height = height + 'px';\n\n    return container;\n  }\n\n  /**\n   * Create a popup for the annotation's HTML element. This is used for\n   * annotations that do not have a Popup entry in the dictionary, but\n   * are of a type that works with popups (such as Highlight annotations).\n   *\n   * @private\n   * @param {HTMLSectionElement} container\n   * @param {HTMLDivElement|HTMLImageElement|null} trigger\n   * @param {Object} data\n   * @memberof AnnotationElement\n   */\n  _createPopup(container, trigger, data) {\n    // If no trigger element is specified, create it.\n    if (!trigger) {\n      trigger = document.createElement('div');\n      trigger.style.height = container.style.height;\n      trigger.style.width = container.style.width;\n      container.appendChild(trigger);\n    }\n\n    let popupElement = new PopupElement({\n      container,\n      trigger,\n      color: data.color,\n      title: data.title,\n      contents: data.contents,\n      hideWrapper: true,\n    });\n    let popup = popupElement.render();\n\n    // Position the popup next to the annotation's container.\n    popup.style.left = container.style.width;\n\n    container.appendChild(popup);\n  }\n\n  /**\n   * Render the annotation's HTML element in the empty container.\n   *\n   * @public\n   * @memberof AnnotationElement\n   */\n  render() {\n    unreachable('Abstract method `AnnotationElement.render` called');\n  }\n}\n\nclass LinkAnnotationElement extends AnnotationElement {\n  constructor(parameters) {\n    let isRenderable = !!(parameters.data.url || parameters.data.dest ||\n                          parameters.data.action);\n    super(parameters, isRenderable);\n  }\n\n  /**\n   * Render the link annotation's HTML element in the empty container.\n   *\n   * @public\n   * @memberof LinkAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    this.container.className = 'linkAnnotation';\n\n    let { data, linkService, } = this;\n    let link = document.createElement('a');\n\n    addLinkAttributes(link, {\n      url: data.url,\n      target: (data.newWindow ?\n               LinkTarget.BLANK : linkService.externalLinkTarget),\n      rel: linkService.externalLinkRel,\n    });\n\n    if (!data.url) {\n      if (data.action) {\n        this._bindNamedAction(link, data.action);\n      } else {\n        this._bindLink(link, data.dest);\n      }\n    }\n\n    this.container.appendChild(link);\n    return this.container;\n  }\n\n  /**\n   * Bind internal links to the link element.\n   *\n   * @private\n   * @param {Object} link\n   * @param {Object} destination\n   * @memberof LinkAnnotationElement\n   */\n  _bindLink(link, destination) {\n    link.href = this.linkService.getDestinationHash(destination);\n    link.onclick = () => {\n      if (destination) {\n        this.linkService.navigateTo(destination);\n      }\n      return false;\n    };\n    if (destination) {\n      link.className = 'internalLink';\n    }\n  }\n\n  /**\n   * Bind named actions to the link element.\n   *\n   * @private\n   * @param {Object} link\n   * @param {Object} action\n   * @memberof LinkAnnotationElement\n   */\n  _bindNamedAction(link, action) {\n    link.href = this.linkService.getAnchorUrl('');\n    link.onclick = () => {\n      this.linkService.executeNamedAction(action);\n      return false;\n    };\n    link.className = 'internalLink';\n  }\n}\n\nclass TextAnnotationElement extends AnnotationElement {\n  constructor(parameters) {\n    let isRenderable = !!(parameters.data.hasPopup ||\n                          parameters.data.title || parameters.data.contents);\n    super(parameters, isRenderable);\n  }\n\n  /**\n   * Render the text annotation's HTML element in the empty container.\n   *\n   * @public\n   * @memberof TextAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    this.container.className = 'textAnnotation';\n\n    let image = document.createElement('img');\n    image.style.height = this.container.style.height;\n    image.style.width = this.container.style.width;\n    image.src = this.imageResourcesPath + 'annotation-' +\n      this.data.name.toLowerCase() + '.svg';\n    image.alt = '[{{type}} Annotation]';\n    image.dataset.l10nId = 'text_annotation_type';\n    image.dataset.l10nArgs = JSON.stringify({ type: this.data.name, });\n\n    if (!this.data.hasPopup) {\n      this._createPopup(this.container, image, this.data);\n    }\n\n    this.container.appendChild(image);\n    return this.container;\n  }\n}\n\nclass WidgetAnnotationElement extends AnnotationElement {\n  /**\n   * Render the widget annotation's HTML element in the empty container.\n   *\n   * @public\n   * @memberof WidgetAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    // Show only the container for unsupported field types.\n    return this.container;\n  }\n}\n\nclass TextWidgetAnnotationElement extends WidgetAnnotationElement {\n  constructor(parameters) {\n    let isRenderable = parameters.renderInteractiveForms ||\n      (!parameters.data.hasAppearance && !!parameters.data.fieldValue);\n    super(parameters, isRenderable);\n  }\n\n  /**\n   * Render the text widget annotation's HTML element in the empty container.\n   *\n   * @public\n   * @memberof TextWidgetAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    const TEXT_ALIGNMENT = ['left', 'center', 'right'];\n\n    this.container.className = 'textWidgetAnnotation';\n\n    let element = null;\n    if (this.renderInteractiveForms) {\n      // NOTE: We cannot set the values using `element.value` below, since it\n      //       prevents the AnnotationLayer rasterizer in `test/driver.js`\n      //       from parsing the elements correctly for the reference tests.\n      if (this.data.multiLine) {\n        element = document.createElement('textarea');\n        element.textContent = this.data.fieldValue;\n      } else {\n        element = document.createElement('input');\n        element.type = 'text';\n        element.setAttribute('value', this.data.fieldValue);\n      }\n\n      element.disabled = this.data.readOnly;\n\n      if (this.data.maxLen !== null) {\n        element.maxLength = this.data.maxLen;\n      }\n\n      if (this.data.comb) {\n        let fieldWidth = this.data.rect[2] - this.data.rect[0];\n        let combWidth = fieldWidth / this.data.maxLen;\n\n        element.classList.add('comb');\n        element.style.letterSpacing = 'calc(' + combWidth + 'px - 1ch)';\n      }\n    } else {\n      element = document.createElement('div');\n      element.textContent = this.data.fieldValue;\n      element.style.verticalAlign = 'middle';\n      element.style.display = 'table-cell';\n\n      let font = null;\n      if (this.data.fontRefName &&\n          this.page.commonObjs.has(this.data.fontRefName)) {\n        font = this.page.commonObjs.get(this.data.fontRefName);\n      }\n      this._setTextStyle(element, font);\n    }\n\n    if (this.data.textAlignment !== null) {\n      element.style.textAlign = TEXT_ALIGNMENT[this.data.textAlignment];\n    }\n\n    this.container.appendChild(element);\n    return this.container;\n  }\n\n  /**\n   * Apply text styles to the text in the element.\n   *\n   * @private\n   * @param {HTMLDivElement} element\n   * @param {Object} font\n   * @memberof TextWidgetAnnotationElement\n   */\n  _setTextStyle(element, font) {\n    // TODO: This duplicates some of the logic in CanvasGraphics.setFont().\n    let style = element.style;\n    style.fontSize = this.data.fontSize + 'px';\n    style.direction = (this.data.fontDirection < 0 ? 'rtl' : 'ltr');\n\n    if (!font) {\n      return;\n    }\n\n    style.fontWeight = (font.black ?\n      (font.bold ? '900' : 'bold') :\n      (font.bold ? 'bold' : 'normal'));\n    style.fontStyle = (font.italic ? 'italic' : 'normal');\n\n    // Use a reasonable default font if the font doesn't specify a fallback.\n    let fontFamily = font.loadedName ? '\"' + font.loadedName + '\", ' : '';\n    let fallbackName = font.fallbackName || 'Helvetica, sans-serif';\n    style.fontFamily = fontFamily + fallbackName;\n  }\n}\n\nclass CheckboxWidgetAnnotationElement extends WidgetAnnotationElement {\n  constructor(parameters) {\n    super(parameters, parameters.renderInteractiveForms);\n  }\n\n  /**\n   * Render the checkbox widget annotation's HTML element\n   * in the empty container.\n   *\n   * @public\n   * @memberof CheckboxWidgetAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    this.container.className = 'buttonWidgetAnnotation checkBox';\n\n    let element = document.createElement('input');\n    element.disabled = this.data.readOnly;\n    element.type = 'checkbox';\n    if (this.data.fieldValue && this.data.fieldValue !== 'Off') {\n      element.setAttribute('checked', true);\n    }\n\n    this.container.appendChild(element);\n    return this.container;\n  }\n}\n\nclass RadioButtonWidgetAnnotationElement extends WidgetAnnotationElement {\n  constructor(parameters) {\n    super(parameters, parameters.renderInteractiveForms);\n  }\n\n  /**\n   * Render the radio button widget annotation's HTML element\n   * in the empty container.\n   *\n   * @public\n   * @memberof RadioButtonWidgetAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    this.container.className = 'buttonWidgetAnnotation radioButton';\n\n    let element = document.createElement('input');\n    element.disabled = this.data.readOnly;\n    element.type = 'radio';\n    element.name = this.data.fieldName;\n    if (this.data.fieldValue === this.data.buttonValue) {\n      element.setAttribute('checked', true);\n    }\n\n    this.container.appendChild(element);\n    return this.container;\n  }\n}\n\nclass PushButtonWidgetAnnotationElement extends LinkAnnotationElement {\n  /**\n   * Render the push button widget annotation's HTML element\n   * in the empty container.\n   *\n   * @public\n   * @memberof PushButtonWidgetAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    // The rendering and functionality of a push button widget annotation is\n    // equal to that of a link annotation, but may have more functionality, such\n    // as performing actions on form fields (resetting, submitting, et cetera).\n    let container = super.render();\n    container.className = 'buttonWidgetAnnotation pushButton';\n    return container;\n  }\n}\n\nclass ChoiceWidgetAnnotationElement extends WidgetAnnotationElement {\n  constructor(parameters) {\n    super(parameters, parameters.renderInteractiveForms);\n  }\n\n  /**\n   * Render the choice widget annotation's HTML element in the empty\n   * container.\n   *\n   * @public\n   * @memberof ChoiceWidgetAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    this.container.className = 'choiceWidgetAnnotation';\n\n    let selectElement = document.createElement('select');\n    selectElement.disabled = this.data.readOnly;\n\n    if (!this.data.combo) {\n      // List boxes have a size and (optionally) multiple selection.\n      selectElement.size = this.data.options.length;\n\n      if (this.data.multiSelect) {\n        selectElement.multiple = true;\n      }\n    }\n\n    // Insert the options into the choice field.\n    for (let i = 0, ii = this.data.options.length; i < ii; i++) {\n      let option = this.data.options[i];\n\n      let optionElement = document.createElement('option');\n      optionElement.textContent = option.displayValue;\n      optionElement.value = option.exportValue;\n\n      if (this.data.fieldValue.includes(option.displayValue)) {\n        optionElement.setAttribute('selected', true);\n      }\n\n      selectElement.appendChild(optionElement);\n    }\n\n    this.container.appendChild(selectElement);\n    return this.container;\n  }\n}\n\nclass PopupAnnotationElement extends AnnotationElement {\n  constructor(parameters) {\n    let isRenderable = !!(parameters.data.title || parameters.data.contents);\n    super(parameters, isRenderable);\n  }\n\n  /**\n   * Render the popup annotation's HTML element in the empty container.\n   *\n   * @public\n   * @memberof PopupAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    // Do not render popup annotations for parent elements with these types as\n    // they create the popups themselves (because of custom trigger divs).\n    const IGNORE_TYPES = [\n      'Line',\n      'Square',\n      'Circle',\n      'PolyLine',\n      'Polygon',\n      'Ink',\n    ];\n\n    this.container.className = 'popupAnnotation';\n\n    if (IGNORE_TYPES.includes(this.data.parentType)) {\n      return this.container;\n    }\n\n    let selector = '[data-annotation-id=\"' + this.data.parentId + '\"]';\n    let parentElement = this.layer.querySelector(selector);\n    if (!parentElement) {\n      return this.container;\n    }\n\n    let popup = new PopupElement({\n      container: this.container,\n      trigger: parentElement,\n      color: this.data.color,\n      title: this.data.title,\n      contents: this.data.contents,\n    });\n\n    // Position the popup next to the parent annotation's container.\n    // PDF viewers ignore a popup annotation's rectangle.\n    let parentLeft = parseFloat(parentElement.style.left);\n    let parentWidth = parseFloat(parentElement.style.width);\n    this.container.style.transformOrigin =\n      -(parentLeft + parentWidth) + 'px -' + parentElement.style.top;\n    this.container.style.left = (parentLeft + parentWidth) + 'px';\n\n    this.container.appendChild(popup.render());\n    return this.container;\n  }\n}\n\nclass PopupElement {\n  constructor(parameters) {\n    this.container = parameters.container;\n    this.trigger = parameters.trigger;\n    this.color = parameters.color;\n    this.title = parameters.title;\n    this.contents = parameters.contents;\n    this.hideWrapper = parameters.hideWrapper || false;\n\n    this.pinned = false;\n  }\n\n  /**\n   * Render the popup's HTML element.\n   *\n   * @public\n   * @memberof PopupElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    const BACKGROUND_ENLIGHT = 0.7;\n\n    let wrapper = document.createElement('div');\n    wrapper.className = 'popupWrapper';\n\n    // For Popup annotations we hide the entire section because it contains\n    // only the popup. However, for Text annotations without a separate Popup\n    // annotation, we cannot hide the entire container as the image would\n    // disappear too. In that special case, hiding the wrapper suffices.\n    this.hideElement = (this.hideWrapper ? wrapper : this.container);\n    this.hideElement.setAttribute('hidden', true);\n\n    let popup = document.createElement('div');\n    popup.className = 'popup';\n\n    let color = this.color;\n    if (color) {\n      // Enlighten the color.\n      let r = BACKGROUND_ENLIGHT * (255 - color[0]) + color[0];\n      let g = BACKGROUND_ENLIGHT * (255 - color[1]) + color[1];\n      let b = BACKGROUND_ENLIGHT * (255 - color[2]) + color[2];\n      popup.style.backgroundColor = Util.makeCssRgb(r | 0, g | 0, b | 0);\n    }\n\n    let contents = this._formatContents(this.contents);\n    let title = document.createElement('h1');\n    title.textContent = this.title;\n\n    // Attach the event listeners to the trigger element.\n    this.trigger.addEventListener('click', this._toggle.bind(this));\n    this.trigger.addEventListener('mouseover', this._show.bind(this, false));\n    this.trigger.addEventListener('mouseout', this._hide.bind(this, false));\n    popup.addEventListener('click', this._hide.bind(this, true));\n\n    popup.appendChild(title);\n    popup.appendChild(contents);\n    wrapper.appendChild(popup);\n    return wrapper;\n  }\n\n  /**\n   * Format the contents of the popup by adding newlines where necessary.\n   *\n   * @private\n   * @param {string} contents\n   * @memberof PopupElement\n   * @returns {HTMLParagraphElement}\n   */\n  _formatContents(contents) {\n    let p = document.createElement('p');\n    let lines = contents.split(/(?:\\r\\n?|\\n)/);\n    for (let i = 0, ii = lines.length; i < ii; ++i) {\n      let line = lines[i];\n      p.appendChild(document.createTextNode(line));\n      if (i < (ii - 1)) {\n        p.appendChild(document.createElement('br'));\n      }\n    }\n    return p;\n  }\n\n  /**\n   * Toggle the visibility of the popup.\n   *\n   * @private\n   * @memberof PopupElement\n   */\n  _toggle() {\n    if (this.pinned) {\n      this._hide(true);\n    } else {\n      this._show(true);\n    }\n  }\n\n  /**\n   * Show the popup.\n   *\n   * @private\n   * @param {boolean} pin\n   * @memberof PopupElement\n   */\n  _show(pin = false) {\n    if (pin) {\n      this.pinned = true;\n    }\n    if (this.hideElement.hasAttribute('hidden')) {\n      this.hideElement.removeAttribute('hidden');\n      this.container.style.zIndex += 1;\n    }\n  }\n\n  /**\n   * Hide the popup.\n   *\n   * @private\n   * @param {boolean} unpin\n   * @memberof PopupElement\n   */\n  _hide(unpin = true) {\n    if (unpin) {\n      this.pinned = false;\n    }\n    if (!this.hideElement.hasAttribute('hidden') && !this.pinned) {\n      this.hideElement.setAttribute('hidden', true);\n      this.container.style.zIndex -= 1;\n    }\n  }\n}\n\nclass LineAnnotationElement extends AnnotationElement {\n  constructor(parameters) {\n    let isRenderable = !!(parameters.data.hasPopup ||\n                          parameters.data.title || parameters.data.contents);\n    super(parameters, isRenderable, /* ignoreBorder = */ true);\n  }\n\n  /**\n   * Render the line annotation's HTML element in the empty container.\n   *\n   * @public\n   * @memberof LineAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    this.container.className = 'lineAnnotation';\n\n    // Create an invisible line with the same starting and ending coordinates\n    // that acts as the trigger for the popup. Only the line itself should\n    // trigger the popup, not the entire container.\n    let data = this.data;\n    let width = data.rect[2] - data.rect[0];\n    let height = data.rect[3] - data.rect[1];\n    let svg = this.svgFactory.create(width, height);\n\n    // PDF coordinates are calculated from a bottom left origin, so transform\n    // the line coordinates to a top left origin for the SVG element.\n    let line = this.svgFactory.createElement('svg:line');\n    line.setAttribute('x1', data.rect[2] - data.lineCoordinates[0]);\n    line.setAttribute('y1', data.rect[3] - data.lineCoordinates[1]);\n    line.setAttribute('x2', data.rect[2] - data.lineCoordinates[2]);\n    line.setAttribute('y2', data.rect[3] - data.lineCoordinates[3]);\n    line.setAttribute('stroke-width', data.borderStyle.width);\n    line.setAttribute('stroke', 'transparent');\n\n    svg.appendChild(line);\n    this.container.append(svg);\n\n    // Create the popup ourselves so that we can bind it to the line instead\n    // of to the entire container (which is the default).\n    this._createPopup(this.container, line, data);\n\n    return this.container;\n  }\n}\n\nclass SquareAnnotationElement extends AnnotationElement {\n  constructor(parameters) {\n    let isRenderable = !!(parameters.data.hasPopup ||\n                          parameters.data.title || parameters.data.contents);\n    super(parameters, isRenderable, /* ignoreBorder = */ true);\n  }\n\n  /**\n   * Render the square annotation's HTML element in the empty container.\n   *\n   * @public\n   * @memberof SquareAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    this.container.className = 'squareAnnotation';\n\n    // Create an invisible square with the same rectangle that acts as the\n    // trigger for the popup. Only the square itself should trigger the\n    // popup, not the entire container.\n    let data = this.data;\n    let width = data.rect[2] - data.rect[0];\n    let height = data.rect[3] - data.rect[1];\n    let svg = this.svgFactory.create(width, height);\n\n    // The browser draws half of the borders inside the square and half of\n    // the borders outside the square by default. This behavior cannot be\n    // changed programmatically, so correct for that here.\n    let borderWidth = data.borderStyle.width;\n    let square = this.svgFactory.createElement('svg:rect');\n    square.setAttribute('x', borderWidth / 2);\n    square.setAttribute('y', borderWidth / 2);\n    square.setAttribute('width', width - borderWidth);\n    square.setAttribute('height', height - borderWidth);\n    square.setAttribute('stroke-width', borderWidth);\n    square.setAttribute('stroke', 'transparent');\n    square.setAttribute('fill', 'none');\n\n    svg.appendChild(square);\n    this.container.append(svg);\n\n    // Create the popup ourselves so that we can bind it to the square instead\n    // of to the entire container (which is the default).\n    this._createPopup(this.container, square, data);\n\n    return this.container;\n  }\n}\n\nclass CircleAnnotationElement extends AnnotationElement {\n  constructor(parameters) {\n    let isRenderable = !!(parameters.data.hasPopup ||\n                          parameters.data.title || parameters.data.contents);\n    super(parameters, isRenderable, /* ignoreBorder = */ true);\n  }\n\n  /**\n   * Render the circle annotation's HTML element in the empty container.\n   *\n   * @public\n   * @memberof CircleAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    this.container.className = 'circleAnnotation';\n\n    // Create an invisible circle with the same ellipse that acts as the\n    // trigger for the popup. Only the circle itself should trigger the\n    // popup, not the entire container.\n    let data = this.data;\n    let width = data.rect[2] - data.rect[0];\n    let height = data.rect[3] - data.rect[1];\n    let svg = this.svgFactory.create(width, height);\n\n    // The browser draws half of the borders inside the circle and half of\n    // the borders outside the circle by default. This behavior cannot be\n    // changed programmatically, so correct for that here.\n    let borderWidth = data.borderStyle.width;\n    let circle = this.svgFactory.createElement('svg:ellipse');\n    circle.setAttribute('cx', width / 2);\n    circle.setAttribute('cy', height / 2);\n    circle.setAttribute('rx', (width / 2) - (borderWidth / 2));\n    circle.setAttribute('ry', (height / 2) - (borderWidth / 2));\n    circle.setAttribute('stroke-width', borderWidth);\n    circle.setAttribute('stroke', 'transparent');\n    circle.setAttribute('fill', 'none');\n\n    svg.appendChild(circle);\n    this.container.append(svg);\n\n    // Create the popup ourselves so that we can bind it to the circle instead\n    // of to the entire container (which is the default).\n    this._createPopup(this.container, circle, data);\n\n    return this.container;\n  }\n}\n\nclass PolylineAnnotationElement extends AnnotationElement {\n  constructor(parameters) {\n    let isRenderable = !!(parameters.data.hasPopup ||\n                          parameters.data.title || parameters.data.contents);\n    super(parameters, isRenderable, /* ignoreBorder = */ true);\n\n    this.containerClassName = 'polylineAnnotation';\n    this.svgElementName = 'svg:polyline';\n  }\n\n  /**\n   * Render the polyline annotation's HTML element in the empty container.\n   *\n   * @public\n   * @memberof PolylineAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    this.container.className = this.containerClassName;\n\n    // Create an invisible polyline with the same points that acts as the\n    // trigger for the popup. Only the polyline itself should trigger the\n    // popup, not the entire container.\n    let data = this.data;\n    let width = data.rect[2] - data.rect[0];\n    let height = data.rect[3] - data.rect[1];\n    let svg = this.svgFactory.create(width, height);\n\n    // Convert the vertices array to a single points string that the SVG\n    // polyline element expects (\"x1,y1 x2,y2 ...\"). PDF coordinates are\n    // calculated from a bottom left origin, so transform the polyline\n    // coordinates to a top left origin for the SVG element.\n    let vertices = data.vertices;\n    let points = [];\n    for (let i = 0, ii = vertices.length; i < ii; i++) {\n      let x = vertices[i].x - data.rect[0];\n      let y = data.rect[3] - vertices[i].y;\n      points.push(x + ',' + y);\n    }\n    points = points.join(' ');\n\n    let borderWidth = data.borderStyle.width;\n    let polyline = this.svgFactory.createElement(this.svgElementName);\n    polyline.setAttribute('points', points);\n    polyline.setAttribute('stroke-width', borderWidth);\n    polyline.setAttribute('stroke', 'transparent');\n    polyline.setAttribute('fill', 'none');\n\n    svg.appendChild(polyline);\n    this.container.append(svg);\n\n    // Create the popup ourselves so that we can bind it to the polyline\n    // instead of to the entire container (which is the default).\n    this._createPopup(this.container, polyline, data);\n\n    return this.container;\n  }\n}\n\nclass PolygonAnnotationElement extends PolylineAnnotationElement {\n  constructor(parameters) {\n    // Polygons are specific forms of polylines, so reuse their logic.\n    super(parameters);\n\n    this.containerClassName = 'polygonAnnotation';\n    this.svgElementName = 'svg:polygon';\n  }\n}\n\nclass InkAnnotationElement extends AnnotationElement {\n  constructor(parameters) {\n    let isRenderable = !!(parameters.data.hasPopup ||\n                          parameters.data.title || parameters.data.contents);\n    super(parameters, isRenderable, /* ignoreBorder = */ true);\n\n    this.containerClassName = 'inkAnnotation';\n\n    // Use the polyline SVG element since it allows us to use coordinates\n    // directly and to draw both straight lines and curves.\n    this.svgElementName = 'svg:polyline';\n  }\n\n  /**\n   * Render the ink annotation's HTML element in the empty container.\n   *\n   * @public\n   * @memberof InkAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    this.container.className = this.containerClassName;\n\n    // Create an invisible polyline with the same points that acts as the\n    // trigger for the popup.\n    let data = this.data;\n    let width = data.rect[2] - data.rect[0];\n    let height = data.rect[3] - data.rect[1];\n    let svg = this.svgFactory.create(width, height);\n\n    let inkLists = data.inkLists;\n    for (let i = 0, ii = inkLists.length; i < ii; i++) {\n      let inkList = inkLists[i];\n      let points = [];\n\n      // Convert the ink list to a single points string that the SVG\n      // polyline element expects (\"x1,y1 x2,y2 ...\"). PDF coordinates are\n      // calculated from a bottom left origin, so transform the polyline\n      // coordinates to a top left origin for the SVG element.\n      for (let j = 0, jj = inkList.length; j < jj; j++) {\n        let x = inkList[j].x - data.rect[0];\n        let y = data.rect[3] - inkList[j].y;\n        points.push(x + ',' + y);\n      }\n\n      points = points.join(' ');\n\n      let borderWidth = data.borderStyle.width;\n      let polyline = this.svgFactory.createElement(this.svgElementName);\n      polyline.setAttribute('points', points);\n      polyline.setAttribute('stroke-width', borderWidth);\n      polyline.setAttribute('stroke', 'transparent');\n      polyline.setAttribute('fill', 'none');\n\n      // Create the popup ourselves so that we can bind it to the polyline\n      // instead of to the entire container (which is the default).\n      this._createPopup(this.container, polyline, data);\n\n      svg.appendChild(polyline);\n    }\n\n    this.container.append(svg);\n\n    return this.container;\n  }\n}\n\nclass HighlightAnnotationElement extends AnnotationElement {\n  constructor(parameters) {\n    let isRenderable = !!(parameters.data.hasPopup ||\n                          parameters.data.title || parameters.data.contents);\n    super(parameters, isRenderable, /* ignoreBorder = */ true);\n  }\n\n  /**\n   * Render the highlight annotation's HTML element in the empty container.\n   *\n   * @public\n   * @memberof HighlightAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    this.container.className = 'highlightAnnotation';\n\n    if (!this.data.hasPopup) {\n      this._createPopup(this.container, null, this.data);\n    }\n    return this.container;\n  }\n}\n\nclass UnderlineAnnotationElement extends AnnotationElement {\n  constructor(parameters) {\n    let isRenderable = !!(parameters.data.hasPopup ||\n                          parameters.data.title || parameters.data.contents);\n    super(parameters, isRenderable, /* ignoreBorder = */ true);\n  }\n\n  /**\n   * Render the underline annotation's HTML element in the empty container.\n   *\n   * @public\n   * @memberof UnderlineAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    this.container.className = 'underlineAnnotation';\n\n    if (!this.data.hasPopup) {\n      this._createPopup(this.container, null, this.data);\n    }\n    return this.container;\n  }\n}\n\nclass SquigglyAnnotationElement extends AnnotationElement {\n  constructor(parameters) {\n    let isRenderable = !!(parameters.data.hasPopup ||\n                          parameters.data.title || parameters.data.contents);\n    super(parameters, isRenderable, /* ignoreBorder = */ true);\n  }\n\n  /**\n   * Render the squiggly annotation's HTML element in the empty container.\n   *\n   * @public\n   * @memberof SquigglyAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    this.container.className = 'squigglyAnnotation';\n\n    if (!this.data.hasPopup) {\n      this._createPopup(this.container, null, this.data);\n    }\n    return this.container;\n  }\n}\n\nclass StrikeOutAnnotationElement extends AnnotationElement {\n  constructor(parameters) {\n    let isRenderable = !!(parameters.data.hasPopup ||\n                          parameters.data.title || parameters.data.contents);\n    super(parameters, isRenderable, /* ignoreBorder = */ true);\n  }\n\n  /**\n   * Render the strikeout annotation's HTML element in the empty container.\n   *\n   * @public\n   * @memberof StrikeOutAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    this.container.className = 'strikeoutAnnotation';\n\n    if (!this.data.hasPopup) {\n      this._createPopup(this.container, null, this.data);\n    }\n    return this.container;\n  }\n}\n\nclass StampAnnotationElement extends AnnotationElement {\n  constructor(parameters) {\n    let isRenderable = !!(parameters.data.hasPopup ||\n                          parameters.data.title || parameters.data.contents);\n    super(parameters, isRenderable, /* ignoreBorder = */ true);\n  }\n\n  /**\n   * Render the stamp annotation's HTML element in the empty container.\n   *\n   * @public\n   * @memberof StampAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    this.container.className = 'stampAnnotation';\n\n    if (!this.data.hasPopup) {\n      this._createPopup(this.container, null, this.data);\n    }\n    return this.container;\n  }\n}\n\nclass FileAttachmentAnnotationElement extends AnnotationElement {\n  constructor(parameters) {\n    super(parameters, /* isRenderable = */ true);\n\n    const { filename, content, } = this.data.file;\n    this.filename = getFilenameFromUrl(filename);\n    this.content = content;\n\n    if (this.linkService.eventBus) {\n      this.linkService.eventBus.dispatch('fileattachmentannotation', {\n        source: this,\n        id: stringToPDFString(filename),\n        filename,\n        content,\n      });\n    }\n  }\n\n  /**\n   * Render the file attachment annotation's HTML element in the empty\n   * container.\n   *\n   * @public\n   * @memberof FileAttachmentAnnotationElement\n   * @returns {HTMLSectionElement}\n   */\n  render() {\n    this.container.className = 'fileAttachmentAnnotation';\n\n    let trigger = document.createElement('div');\n    trigger.style.height = this.container.style.height;\n    trigger.style.width = this.container.style.width;\n    trigger.addEventListener('dblclick', this._download.bind(this));\n\n    if (!this.data.hasPopup && (this.data.title || this.data.contents)) {\n      this._createPopup(this.container, trigger, this.data);\n    }\n\n    this.container.appendChild(trigger);\n    return this.container;\n  }\n\n  /**\n   * Download the file attachment associated with this annotation.\n   *\n   * @private\n   * @memberof FileAttachmentAnnotationElement\n   */\n  _download() {\n    if (!this.downloadManager) {\n      warn('Download cannot be started due to unavailable download manager');\n      return;\n    }\n    this.downloadManager.downloadData(this.content, this.filename, '');\n  }\n}\n\n/**\n * @typedef {Object} AnnotationLayerParameters\n * @property {PageViewport} viewport\n * @property {HTMLDivElement} div\n * @property {Array} annotations\n * @property {PDFPage} page\n * @property {IPDFLinkService} linkService\n * @property {DownloadManager} downloadManager\n * @property {string} imageResourcesPath - (optional) Path for image resources,\n *   mainly for annotation icons. Include trailing slash.\n * @property {boolean} renderInteractiveForms\n */\n\nclass AnnotationLayer {\n  /**\n   * Render a new annotation layer with all annotation elements.\n   *\n   * @public\n   * @param {AnnotationLayerParameters} parameters\n   * @memberof AnnotationLayer\n   */\n  static render(parameters) {\n    for (let i = 0, ii = parameters.annotations.length; i < ii; i++) {\n      let data = parameters.annotations[i];\n      if (!data) {\n        continue;\n      }\n      let element = AnnotationElementFactory.create({\n        data,\n        layer: parameters.div,\n        page: parameters.page,\n        viewport: parameters.viewport,\n        linkService: parameters.linkService,\n        downloadManager: parameters.downloadManager,\n        imageResourcesPath: parameters.imageResourcesPath || '',\n        renderInteractiveForms: parameters.renderInteractiveForms || false,\n        svgFactory: new DOMSVGFactory(),\n      });\n      if (element.isRenderable) {\n        parameters.div.appendChild(element.render());\n      }\n    }\n  }\n\n  /**\n   * Update the annotation elements on existing annotation layer.\n   *\n   * @public\n   * @param {AnnotationLayerParameters} parameters\n   * @memberof AnnotationLayer\n   */\n  static update(parameters) {\n    for (let i = 0, ii = parameters.annotations.length; i < ii; i++) {\n      let data = parameters.annotations[i];\n      let element = parameters.div.querySelector(\n        '[data-annotation-id=\"' + data.id + '\"]');\n      if (element) {\n        element.style.transform =\n          'matrix(' + parameters.viewport.transform.join(',') + ')';\n      }\n    }\n    parameters.div.removeAttribute('hidden');\n  }\n}\n\nexport {\n  AnnotationLayer,\n};\n","/* Copyright 2012 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n/* globals __non_webpack_require__ */\n\nimport {\n  createObjectURL, FONT_IDENTITY_MATRIX, IDENTITY_MATRIX, ImageKind, isNum, OPS,\n  TextRenderingMode, Util, warn\n} from '../shared/util';\nimport { DOMSVGFactory } from './dom_utils';\nimport isNodeJS from '../shared/is_node';\n\nvar SVGGraphics = function() {\n  throw new Error('Not implemented: SVGGraphics');\n};\n\nif (typeof PDFJSDev === 'undefined' || PDFJSDev.test('GENERIC')) {\n\nvar SVG_DEFAULTS = {\n  fontStyle: 'normal',\n  fontWeight: 'normal',\n  fillColor: '#000000',\n};\n\nvar convertImgDataToPng = (function convertImgDataToPngClosure() {\n  var PNG_HEADER =\n    new Uint8Array([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a]);\n\n  var CHUNK_WRAPPER_SIZE = 12;\n\n  var crcTable = new Int32Array(256);\n  for (var i = 0; i < 256; i++) {\n    var c = i;\n    for (var h = 0; h < 8; h++) {\n      if (c & 1) {\n        c = 0xedB88320 ^ ((c >> 1) & 0x7fffffff);\n      } else {\n        c = (c >> 1) & 0x7fffffff;\n      }\n    }\n    crcTable[i] = c;\n  }\n\n  function crc32(data, start, end) {\n    var crc = -1;\n    for (var i = start; i < end; i++) {\n      var a = (crc ^ data[i]) & 0xff;\n      var b = crcTable[a];\n      crc = (crc >>> 8) ^ b;\n    }\n    return crc ^ -1;\n  }\n\n  function writePngChunk(type, body, data, offset) {\n    var p = offset;\n    var len = body.length;\n\n    data[p] = len >> 24 & 0xff;\n    data[p + 1] = len >> 16 & 0xff;\n    data[p + 2] = len >> 8 & 0xff;\n    data[p + 3] = len & 0xff;\n    p += 4;\n\n    data[p] = type.charCodeAt(0) & 0xff;\n    data[p + 1] = type.charCodeAt(1) & 0xff;\n    data[p + 2] = type.charCodeAt(2) & 0xff;\n    data[p + 3] = type.charCodeAt(3) & 0xff;\n    p += 4;\n\n    data.set(body, p);\n    p += body.length;\n\n    var crc = crc32(data, offset + 4, p);\n\n    data[p] = crc >> 24 & 0xff;\n    data[p + 1] = crc >> 16 & 0xff;\n    data[p + 2] = crc >> 8 & 0xff;\n    data[p + 3] = crc & 0xff;\n  }\n\n  function adler32(data, start, end) {\n    var a = 1;\n    var b = 0;\n    for (var i = start; i < end; ++i) {\n      a = (a + (data[i] & 0xff)) % 65521;\n      b = (b + a) % 65521;\n    }\n    return (b << 16) | a;\n  }\n\n  /**\n   * @param {Uint8Array} literals The input data.\n   * @returns {Uint8Array} The DEFLATE-compressed data stream in zlib format.\n   *   This is the required format for compressed streams in the PNG format:\n   *   http://www.libpng.org/pub/png/spec/1.2/PNG-Compression.html\n   */\n  function deflateSync(literals) {\n    if (!isNodeJS()) {\n      // zlib is certainly not available outside of Node.js. We can either use\n      // the pako library for client-side DEFLATE compression, or use the canvas\n      // API of the browser to obtain a more optimal PNG file.\n      return deflateSyncUncompressed(literals);\n    }\n    try {\n      // NOTE: This implementation is far from perfect, but already way better\n      // than not applying any compression.\n      //\n      // A better algorithm will try to choose a good predictor/filter and\n      // then choose a suitable zlib compression strategy (e.g. 3,Z_RLE).\n      //\n      // Node v0.11.12 zlib.deflateSync is introduced (and returns a Buffer).\n      // Node v3.0.0   Buffer inherits from Uint8Array.\n      // Node v8.0.0   zlib.deflateSync accepts Uint8Array as input.\n      var input;\n        // eslint-disable-next-line no-undef\n      if (parseInt(process.versions.node) >= 8) {\n        input = literals;\n      } else {\n        // eslint-disable-next-line no-undef\n        input = new Buffer(literals);\n      }\n      var output = __non_webpack_require__('zlib')\n        .deflateSync(input, { level: 9, });\n      return output instanceof Uint8Array ? output : new Uint8Array(output);\n    } catch (e) {\n      warn('Not compressing PNG because zlib.deflateSync is unavailable: ' + e);\n    }\n\n    return deflateSyncUncompressed(literals);\n  }\n\n  // An implementation of DEFLATE with compression level 0 (Z_NO_COMPRESSION).\n  function deflateSyncUncompressed(literals) {\n    var len = literals.length;\n    var maxBlockLength = 0xFFFF;\n\n    var deflateBlocks = Math.ceil(len / maxBlockLength);\n    var idat = new Uint8Array(2 + len + deflateBlocks * 5 + 4);\n    var pi = 0;\n    idat[pi++] = 0x78; // compression method and flags\n    idat[pi++] = 0x9c; // flags\n\n    var pos = 0;\n    while (len > maxBlockLength) {\n      // writing non-final DEFLATE blocks type 0 and length of 65535\n      idat[pi++] = 0x00;\n      idat[pi++] = 0xff;\n      idat[pi++] = 0xff;\n      idat[pi++] = 0x00;\n      idat[pi++] = 0x00;\n      idat.set(literals.subarray(pos, pos + maxBlockLength), pi);\n      pi += maxBlockLength;\n      pos += maxBlockLength;\n      len -= maxBlockLength;\n    }\n\n    // writing non-final DEFLATE blocks type 0\n    idat[pi++] = 0x01;\n    idat[pi++] = len & 0xff;\n    idat[pi++] = len >> 8 & 0xff;\n    idat[pi++] = (~len & 0xffff) & 0xff;\n    idat[pi++] = (~len & 0xffff) >> 8 & 0xff;\n    idat.set(literals.subarray(pos), pi);\n    pi += literals.length - pos;\n\n    var adler = adler32(literals, 0, literals.length); // checksum\n    idat[pi++] = adler >> 24 & 0xff;\n    idat[pi++] = adler >> 16 & 0xff;\n    idat[pi++] = adler >> 8 & 0xff;\n    idat[pi++] = adler & 0xff;\n    return idat;\n  }\n\n  function encode(imgData, kind, forceDataSchema, isMask) {\n    var width = imgData.width;\n    var height = imgData.height;\n    var bitDepth, colorType, lineSize;\n    var bytes = imgData.data;\n\n    switch (kind) {\n      case ImageKind.GRAYSCALE_1BPP:\n        colorType = 0;\n        bitDepth = 1;\n        lineSize = (width + 7) >> 3;\n        break;\n      case ImageKind.RGB_24BPP:\n        colorType = 2;\n        bitDepth = 8;\n        lineSize = width * 3;\n        break;\n      case ImageKind.RGBA_32BPP:\n        colorType = 6;\n        bitDepth = 8;\n        lineSize = width * 4;\n        break;\n      default:\n        throw new Error('invalid format');\n    }\n\n    // prefix every row with predictor 0\n    var literals = new Uint8Array((1 + lineSize) * height);\n    var offsetLiterals = 0, offsetBytes = 0;\n    var y, i;\n    for (y = 0; y < height; ++y) {\n      literals[offsetLiterals++] = 0; // no prediction\n      literals.set(bytes.subarray(offsetBytes, offsetBytes + lineSize),\n                   offsetLiterals);\n      offsetBytes += lineSize;\n      offsetLiterals += lineSize;\n    }\n\n    if (kind === ImageKind.GRAYSCALE_1BPP && isMask) {\n      // inverting for image masks\n      offsetLiterals = 0;\n      for (y = 0; y < height; y++) {\n        offsetLiterals++; // skipping predictor\n        for (i = 0; i < lineSize; i++) {\n          literals[offsetLiterals++] ^= 0xFF;\n        }\n      }\n    }\n\n    var ihdr = new Uint8Array([\n      width >> 24 & 0xff,\n      width >> 16 & 0xff,\n      width >> 8 & 0xff,\n      width & 0xff,\n      height >> 24 & 0xff,\n      height >> 16 & 0xff,\n      height >> 8 & 0xff,\n      height & 0xff,\n      bitDepth, // bit depth\n      colorType, // color type\n      0x00, // compression method\n      0x00, // filter method\n      0x00 // interlace method\n    ]);\n\n    var idat = deflateSync(literals);\n\n    // PNG will consists: header, IHDR+data, IDAT+data, and IEND.\n    var pngLength = PNG_HEADER.length + (CHUNK_WRAPPER_SIZE * 3) +\n                    ihdr.length + idat.length;\n    var data = new Uint8Array(pngLength);\n    var offset = 0;\n    data.set(PNG_HEADER, offset);\n    offset += PNG_HEADER.length;\n    writePngChunk('IHDR', ihdr, data, offset);\n    offset += CHUNK_WRAPPER_SIZE + ihdr.length;\n    writePngChunk('IDATA', idat, data, offset);\n    offset += CHUNK_WRAPPER_SIZE + idat.length;\n    writePngChunk('IEND', new Uint8Array(0), data, offset);\n\n    return createObjectURL(data, 'image/png', forceDataSchema);\n  }\n\n  return function convertImgDataToPng(imgData, forceDataSchema, isMask) {\n    var kind = (imgData.kind === undefined ?\n                ImageKind.GRAYSCALE_1BPP : imgData.kind);\n    return encode(imgData, kind, forceDataSchema, isMask);\n  };\n})();\n\nvar SVGExtraState = (function SVGExtraStateClosure() {\n  function SVGExtraState() {\n    this.fontSizeScale = 1;\n    this.fontWeight = SVG_DEFAULTS.fontWeight;\n    this.fontSize = 0;\n\n    this.textMatrix = IDENTITY_MATRIX;\n    this.fontMatrix = FONT_IDENTITY_MATRIX;\n    this.leading = 0;\n    this.textRenderingMode = TextRenderingMode.FILL;\n\n    // Current point (in user coordinates)\n    this.x = 0;\n    this.y = 0;\n\n    // Start of text line (in text coordinates)\n    this.lineX = 0;\n    this.lineY = 0;\n\n    // Character and word spacing\n    this.charSpacing = 0;\n    this.wordSpacing = 0;\n    this.textHScale = 1;\n    this.textRise = 0;\n\n    // Default foreground and background colors\n    this.fillColor = SVG_DEFAULTS.fillColor;\n    this.strokeColor = '#000000';\n\n    this.fillAlpha = 1;\n    this.strokeAlpha = 1;\n    this.lineWidth = 1;\n    this.lineJoin = '';\n    this.lineCap = '';\n    this.miterLimit = 0;\n\n    this.dashArray = [];\n    this.dashPhase = 0;\n\n    this.dependencies = [];\n\n    // Clipping\n    this.activeClipUrl = null;\n    this.clipGroup = null;\n\n    this.maskId = '';\n  }\n\n  SVGExtraState.prototype = {\n    clone: function SVGExtraState_clone() {\n      return Object.create(this);\n    },\n    setCurrentPoint: function SVGExtraState_setCurrentPoint(x, y) {\n      this.x = x;\n      this.y = y;\n    },\n  };\n  return SVGExtraState;\n})();\n\nSVGGraphics = (function SVGGraphicsClosure() {\n  function opListToTree(opList) {\n    var opTree = [];\n    var tmp = [];\n    var opListLen = opList.length;\n\n    for (var x = 0; x < opListLen; x++) {\n      if (opList[x].fn === 'save') {\n        opTree.push({ 'fnId': 92, 'fn': 'group', 'items': [], });\n        tmp.push(opTree);\n        opTree = opTree[opTree.length - 1].items;\n        continue;\n      }\n\n      if (opList[x].fn === 'restore') {\n        opTree = tmp.pop();\n      } else {\n        opTree.push(opList[x]);\n      }\n    }\n    return opTree;\n  }\n\n  /**\n   * Formats float number.\n   * @param value {number} number to format.\n   * @returns {string}\n   */\n  function pf(value) {\n    if (Number.isInteger(value)) {\n      return value.toString();\n    }\n    var s = value.toFixed(10);\n    var i = s.length - 1;\n    if (s[i] !== '0') {\n      return s;\n    }\n    // removing trailing zeros\n    do {\n      i--;\n    } while (s[i] === '0');\n    return s.substring(0, s[i] === '.' ? i : i + 1);\n  }\n\n  /**\n   * Formats transform matrix. The standard rotation, scale and translate\n   * matrices are replaced by their shorter forms, and for identity matrix\n   * returns empty string to save the memory.\n   * @param m {Array} matrix to format.\n   * @returns {string}\n   */\n  function pm(m) {\n    if (m[4] === 0 && m[5] === 0) {\n      if (m[1] === 0 && m[2] === 0) {\n        if (m[0] === 1 && m[3] === 1) {\n          return '';\n        }\n        return 'scale(' + pf(m[0]) + ' ' + pf(m[3]) + ')';\n      }\n      if (m[0] === m[3] && m[1] === -m[2]) {\n        var a = Math.acos(m[0]) * 180 / Math.PI;\n        return 'rotate(' + pf(a) + ')';\n      }\n    } else {\n      if (m[0] === 1 && m[1] === 0 && m[2] === 0 && m[3] === 1) {\n        return 'translate(' + pf(m[4]) + ' ' + pf(m[5]) + ')';\n      }\n    }\n    return 'matrix(' + pf(m[0]) + ' ' + pf(m[1]) + ' ' + pf(m[2]) + ' ' +\n      pf(m[3]) + ' ' + pf(m[4]) + ' ' + pf(m[5]) + ')';\n  }\n\n  function SVGGraphics(commonObjs, objs, forceDataSchema) {\n    this.svgFactory = new DOMSVGFactory();\n\n    this.current = new SVGExtraState();\n    this.transformMatrix = IDENTITY_MATRIX; // Graphics state matrix\n    this.transformStack = [];\n    this.extraStack = [];\n    this.commonObjs = commonObjs;\n    this.objs = objs;\n    this.pendingClip = null;\n    this.pendingEOFill = false;\n\n    this.embedFonts = false;\n    this.embeddedFonts = Object.create(null);\n    this.cssStyle = null;\n    this.forceDataSchema = !!forceDataSchema;\n  }\n\n  var XML_NS = 'http://www.w3.org/XML/1998/namespace';\n  var XLINK_NS = 'http://www.w3.org/1999/xlink';\n  var LINE_CAP_STYLES = ['butt', 'round', 'square'];\n  var LINE_JOIN_STYLES = ['miter', 'round', 'bevel'];\n  var clipCount = 0;\n  var maskCount = 0;\n\n  SVGGraphics.prototype = {\n    save: function SVGGraphics_save() {\n      this.transformStack.push(this.transformMatrix);\n      var old = this.current;\n      this.extraStack.push(old);\n      this.current = old.clone();\n    },\n\n    restore: function SVGGraphics_restore() {\n      this.transformMatrix = this.transformStack.pop();\n      this.current = this.extraStack.pop();\n\n      this.pendingClip = null;\n      this.tgrp = null;\n    },\n\n    group: function SVGGraphics_group(items) {\n      this.save();\n      this.executeOpTree(items);\n      this.restore();\n    },\n\n    loadDependencies: function SVGGraphics_loadDependencies(operatorList) {\n      var fnArray = operatorList.fnArray;\n      var fnArrayLen = fnArray.length;\n      var argsArray = operatorList.argsArray;\n\n      for (var i = 0; i < fnArrayLen; i++) {\n        if (OPS.dependency === fnArray[i]) {\n          var deps = argsArray[i];\n          for (var n = 0, nn = deps.length; n < nn; n++) {\n            var obj = deps[n];\n            var common = obj.substring(0, 2) === 'g_';\n            var promise;\n            if (common) {\n              promise = new Promise((resolve) => {\n                this.commonObjs.get(obj, resolve);\n              });\n            } else {\n              promise = new Promise((resolve) => {\n                this.objs.get(obj, resolve);\n              });\n            }\n            this.current.dependencies.push(promise);\n          }\n        }\n      }\n      return Promise.all(this.current.dependencies);\n    },\n\n    transform: function SVGGraphics_transform(a, b, c, d, e, f) {\n      var transformMatrix = [a, b, c, d, e, f];\n      this.transformMatrix = Util.transform(this.transformMatrix,\n                                            transformMatrix);\n      this.tgrp = null;\n    },\n\n    getSVG: function SVGGraphics_getSVG(operatorList, viewport) {\n      this.viewport = viewport;\n\n      var svgElement = this._initialize(viewport);\n      return this.loadDependencies(operatorList).then(() => {\n        this.transformMatrix = IDENTITY_MATRIX;\n        var opTree = this.convertOpList(operatorList);\n        this.executeOpTree(opTree);\n        return svgElement;\n      });\n    },\n\n    convertOpList: function SVGGraphics_convertOpList(operatorList) {\n      var argsArray = operatorList.argsArray;\n      var fnArray = operatorList.fnArray;\n      var fnArrayLen = fnArray.length;\n      var REVOPS = [];\n      var opList = [];\n\n      for (var op in OPS) {\n        REVOPS[OPS[op]] = op;\n      }\n\n      for (var x = 0; x < fnArrayLen; x++) {\n        var fnId = fnArray[x];\n        opList.push({\n          'fnId': fnId,\n          'fn': REVOPS[fnId],\n          'args': argsArray[x],\n        });\n      }\n      return opListToTree(opList);\n    },\n\n    executeOpTree: function SVGGraphics_executeOpTree(opTree) {\n      var opTreeLen = opTree.length;\n      for (var x = 0; x < opTreeLen; x++) {\n        var fn = opTree[x].fn;\n        var fnId = opTree[x].fnId;\n        var args = opTree[x].args;\n\n        switch (fnId | 0) {\n          case OPS.beginText:\n            this.beginText();\n            break;\n          case OPS.dependency:\n            // Handled in loadDependencies, warning should not be thrown\n            break;\n          case OPS.setLeading:\n            this.setLeading(args);\n            break;\n          case OPS.setLeadingMoveText:\n            this.setLeadingMoveText(args[0], args[1]);\n            break;\n          case OPS.setFont:\n            this.setFont(args);\n            break;\n          case OPS.showText:\n            this.showText(args[0]);\n            break;\n          case OPS.showSpacedText:\n            this.showText(args[0]);\n            break;\n          case OPS.endText:\n            this.endText();\n            break;\n          case OPS.moveText:\n            this.moveText(args[0], args[1]);\n            break;\n          case OPS.setCharSpacing:\n            this.setCharSpacing(args[0]);\n            break;\n          case OPS.setWordSpacing:\n            this.setWordSpacing(args[0]);\n            break;\n          case OPS.setHScale:\n            this.setHScale(args[0]);\n            break;\n          case OPS.setTextMatrix:\n            this.setTextMatrix(args[0], args[1], args[2],\n                               args[3], args[4], args[5]);\n            break;\n          case OPS.setTextRise:\n            this.setTextRise(args[0]);\n            break;\n          case OPS.setTextRenderingMode:\n            this.setTextRenderingMode(args[0]);\n            break;\n          case OPS.setLineWidth:\n            this.setLineWidth(args[0]);\n            break;\n          case OPS.setLineJoin:\n            this.setLineJoin(args[0]);\n            break;\n          case OPS.setLineCap:\n            this.setLineCap(args[0]);\n            break;\n          case OPS.setMiterLimit:\n            this.setMiterLimit(args[0]);\n            break;\n          case OPS.setFillRGBColor:\n            this.setFillRGBColor(args[0], args[1], args[2]);\n            break;\n          case OPS.setStrokeRGBColor:\n            this.setStrokeRGBColor(args[0], args[1], args[2]);\n            break;\n          case OPS.setDash:\n            this.setDash(args[0], args[1]);\n            break;\n          case OPS.setGState:\n            this.setGState(args[0]);\n            break;\n          case OPS.fill:\n            this.fill();\n            break;\n          case OPS.eoFill:\n            this.eoFill();\n            break;\n          case OPS.stroke:\n            this.stroke();\n            break;\n          case OPS.fillStroke:\n            this.fillStroke();\n            break;\n          case OPS.eoFillStroke:\n            this.eoFillStroke();\n            break;\n          case OPS.clip:\n            this.clip('nonzero');\n            break;\n          case OPS.eoClip:\n            this.clip('evenodd');\n            break;\n          case OPS.paintSolidColorImageMask:\n            this.paintSolidColorImageMask();\n            break;\n          case OPS.paintJpegXObject:\n            this.paintJpegXObject(args[0], args[1], args[2]);\n            break;\n          case OPS.paintImageXObject:\n            this.paintImageXObject(args[0]);\n            break;\n          case OPS.paintInlineImageXObject:\n            this.paintInlineImageXObject(args[0]);\n            break;\n          case OPS.paintImageMaskXObject:\n            this.paintImageMaskXObject(args[0]);\n            break;\n          case OPS.paintFormXObjectBegin:\n            this.paintFormXObjectBegin(args[0], args[1]);\n            break;\n          case OPS.paintFormXObjectEnd:\n            this.paintFormXObjectEnd();\n            break;\n          case OPS.closePath:\n            this.closePath();\n            break;\n          case OPS.closeStroke:\n            this.closeStroke();\n            break;\n          case OPS.closeFillStroke:\n            this.closeFillStroke();\n            break;\n          case OPS.closeEOFillStroke:\n            this.closeEOFillStroke();\n            break;\n          case OPS.nextLine:\n            this.nextLine();\n            break;\n          case OPS.transform:\n            this.transform(args[0], args[1], args[2], args[3],\n                           args[4], args[5]);\n            break;\n          case OPS.constructPath:\n            this.constructPath(args[0], args[1]);\n            break;\n          case OPS.endPath:\n            this.endPath();\n            break;\n          case 92:\n            this.group(opTree[x].items);\n            break;\n          default:\n            warn('Unimplemented operator ' + fn);\n            break;\n        }\n      }\n    },\n\n    setWordSpacing: function SVGGraphics_setWordSpacing(wordSpacing) {\n      this.current.wordSpacing = wordSpacing;\n    },\n\n    setCharSpacing: function SVGGraphics_setCharSpacing(charSpacing) {\n      this.current.charSpacing = charSpacing;\n    },\n\n    nextLine: function SVGGraphics_nextLine() {\n      this.moveText(0, this.current.leading);\n    },\n\n    setTextMatrix: function SVGGraphics_setTextMatrix(a, b, c, d, e, f) {\n      var current = this.current;\n      this.current.textMatrix = this.current.lineMatrix = [a, b, c, d, e, f];\n\n      this.current.x = this.current.lineX = 0;\n      this.current.y = this.current.lineY = 0;\n\n      current.xcoords = [];\n      current.tspan = this.svgFactory.createElement('svg:tspan');\n      current.tspan.setAttributeNS(null, 'font-family', current.fontFamily);\n      current.tspan.setAttributeNS(null, 'font-size',\n                                   pf(current.fontSize) + 'px');\n      current.tspan.setAttributeNS(null, 'y', pf(-current.y));\n\n      current.txtElement = this.svgFactory.createElement('svg:text');\n      current.txtElement.appendChild(current.tspan);\n    },\n\n    beginText: function SVGGraphics_beginText() {\n      this.current.x = this.current.lineX = 0;\n      this.current.y = this.current.lineY = 0;\n      this.current.textMatrix = IDENTITY_MATRIX;\n      this.current.lineMatrix = IDENTITY_MATRIX;\n      this.current.tspan = this.svgFactory.createElement('svg:tspan');\n      this.current.txtElement = this.svgFactory.createElement('svg:text');\n      this.current.txtgrp = this.svgFactory.createElement('svg:g');\n      this.current.xcoords = [];\n    },\n\n    moveText: function SVGGraphics_moveText(x, y) {\n      var current = this.current;\n      this.current.x = this.current.lineX += x;\n      this.current.y = this.current.lineY += y;\n\n      current.xcoords = [];\n      current.tspan = this.svgFactory.createElement('svg:tspan');\n      current.tspan.setAttributeNS(null, 'font-family', current.fontFamily);\n      current.tspan.setAttributeNS(null, 'font-size',\n                                   pf(current.fontSize) + 'px');\n      current.tspan.setAttributeNS(null, 'y', pf(-current.y));\n    },\n\n    showText: function SVGGraphics_showText(glyphs) {\n      var current = this.current;\n      var font = current.font;\n      var fontSize = current.fontSize;\n\n      if (fontSize === 0) {\n        return;\n      }\n\n      var charSpacing = current.charSpacing;\n      var wordSpacing = current.wordSpacing;\n      var fontDirection = current.fontDirection;\n      var textHScale = current.textHScale * fontDirection;\n      var glyphsLength = glyphs.length;\n      var vertical = font.vertical;\n      var widthAdvanceScale = fontSize * current.fontMatrix[0];\n\n      var x = 0, i;\n      for (i = 0; i < glyphsLength; ++i) {\n        var glyph = glyphs[i];\n        if (glyph === null) {\n          // word break\n          x += fontDirection * wordSpacing;\n          continue;\n        } else if (isNum(glyph)) {\n          x += -glyph * fontSize * 0.001;\n          continue;\n        }\n\n        var width = glyph.width;\n        var character = glyph.fontChar;\n        var spacing = (glyph.isSpace ? wordSpacing : 0) + charSpacing;\n        var charWidth = width * widthAdvanceScale + spacing * fontDirection;\n\n        if (!glyph.isInFont && !font.missingFile) {\n          x += charWidth;\n          // TODO: To assist with text selection, we should replace the missing\n          // character with a space character if charWidth is not zero.\n          // But we cannot just do \"character = ' '\", because the ' ' character\n          // might actually map to a different glyph.\n          continue;\n        }\n        current.xcoords.push(current.x + x * textHScale);\n        current.tspan.textContent += character;\n        x += charWidth;\n      }\n      if (vertical) {\n        current.y -= x * textHScale;\n      } else {\n        current.x += x * textHScale;\n      }\n\n      current.tspan.setAttributeNS(null, 'x',\n                                   current.xcoords.map(pf).join(' '));\n      current.tspan.setAttributeNS(null, 'y', pf(-current.y));\n      current.tspan.setAttributeNS(null, 'font-family', current.fontFamily);\n      current.tspan.setAttributeNS(null, 'font-size',\n                                   pf(current.fontSize) + 'px');\n      if (current.fontStyle !== SVG_DEFAULTS.fontStyle) {\n        current.tspan.setAttributeNS(null, 'font-style', current.fontStyle);\n      }\n      if (current.fontWeight !== SVG_DEFAULTS.fontWeight) {\n        current.tspan.setAttributeNS(null, 'font-weight', current.fontWeight);\n      }\n\n      const fillStrokeMode = current.textRenderingMode &\n        TextRenderingMode.FILL_STROKE_MASK;\n\n      if (fillStrokeMode === TextRenderingMode.FILL ||\n          fillStrokeMode === TextRenderingMode.FILL_STROKE) {\n        if (current.fillColor !== SVG_DEFAULTS.fillColor) {\n          current.tspan.setAttributeNS(null, 'fill', current.fillColor);\n        }\n        if (current.fillAlpha < 1) {\n          current.tspan.setAttributeNS(null, 'fill-opacity', current.fillAlpha);\n        }\n      } else if (current.textRenderingMode === TextRenderingMode.ADD_TO_PATH) {\n        // Workaround for Firefox: We must set fill=\"transparent\" because\n        // fill=\"none\" would generate an empty clipping path.\n        current.tspan.setAttributeNS(null, 'fill', 'transparent');\n      } else {\n        current.tspan.setAttributeNS(null, 'fill', 'none');\n      }\n\n      if (fillStrokeMode === TextRenderingMode.STROKE ||\n          fillStrokeMode === TextRenderingMode.FILL_STROKE) {\n        this._setStrokeAttributes(current.tspan);\n      }\n\n      // Include the text rise in the text matrix since the `pm` function\n      // creates the SVG element's `translate` entry (work on a copy to avoid\n      // altering the original text matrix).\n      let textMatrix = current.textMatrix;\n      if (current.textRise !== 0) {\n        textMatrix = textMatrix.slice();\n        textMatrix[5] += current.textRise;\n      }\n\n      current.txtElement.setAttributeNS(null, 'transform',\n                                        pm(textMatrix) + ' scale(1, -1)');\n      current.txtElement.setAttributeNS(XML_NS, 'xml:space', 'preserve');\n      current.txtElement.appendChild(current.tspan);\n      current.txtgrp.appendChild(current.txtElement);\n\n      this._ensureTransformGroup().appendChild(current.txtElement);\n    },\n\n    setLeadingMoveText: function SVGGraphics_setLeadingMoveText(x, y) {\n      this.setLeading(-y);\n      this.moveText(x, y);\n    },\n\n    addFontStyle: function SVGGraphics_addFontStyle(fontObj) {\n      if (!this.cssStyle) {\n        this.cssStyle = this.svgFactory.createElement('svg:style');\n        this.cssStyle.setAttributeNS(null, 'type', 'text/css');\n        this.defs.appendChild(this.cssStyle);\n      }\n\n      var url = createObjectURL(fontObj.data, fontObj.mimetype,\n                                this.forceDataSchema);\n      this.cssStyle.textContent +=\n        '@font-face { font-family: \"' + fontObj.loadedName + '\";' +\n        ' src: url(' + url + '); }\\n';\n    },\n\n    setFont: function SVGGraphics_setFont(details) {\n      var current = this.current;\n      var fontObj = this.commonObjs.get(details[0]);\n      var size = details[1];\n      this.current.font = fontObj;\n\n      if (this.embedFonts && fontObj.data &&\n          !this.embeddedFonts[fontObj.loadedName]) {\n        this.addFontStyle(fontObj);\n        this.embeddedFonts[fontObj.loadedName] = fontObj;\n      }\n\n      current.fontMatrix = (fontObj.fontMatrix ?\n                            fontObj.fontMatrix : FONT_IDENTITY_MATRIX);\n\n      var bold = fontObj.black ? (fontObj.bold ? 'bolder' : 'bold') :\n                                 (fontObj.bold ? 'bold' : 'normal');\n      var italic = fontObj.italic ? 'italic' : 'normal';\n\n      if (size < 0) {\n        size = -size;\n        current.fontDirection = -1;\n      } else {\n        current.fontDirection = 1;\n      }\n      current.fontSize = size;\n      current.fontFamily = fontObj.loadedName;\n      current.fontWeight = bold;\n      current.fontStyle = italic;\n\n      current.tspan = this.svgFactory.createElement('svg:tspan');\n      current.tspan.setAttributeNS(null, 'y', pf(-current.y));\n      current.xcoords = [];\n    },\n\n    endText() {\n      const current = this.current;\n      if ((current.textRenderingMode & TextRenderingMode.ADD_TO_PATH_FLAG) &&\n          current.txtElement && current.txtElement.hasChildNodes()) {\n        // If no glyphs are shown (i.e. no child nodes), no clipping occurs.\n        current.element = current.txtElement;\n        this.clip('nonzero');\n        this.endPath();\n      }\n    },\n\n    // Path properties\n    setLineWidth: function SVGGraphics_setLineWidth(width) {\n      if (width > 0) {\n        this.current.lineWidth = width;\n      }\n    },\n    setLineCap: function SVGGraphics_setLineCap(style) {\n      this.current.lineCap = LINE_CAP_STYLES[style];\n    },\n    setLineJoin: function SVGGraphics_setLineJoin(style) {\n      this.current.lineJoin = LINE_JOIN_STYLES[style];\n    },\n    setMiterLimit: function SVGGraphics_setMiterLimit(limit) {\n      this.current.miterLimit = limit;\n    },\n    setStrokeAlpha: function SVGGraphics_setStrokeAlpha(strokeAlpha) {\n      this.current.strokeAlpha = strokeAlpha;\n    },\n    setStrokeRGBColor: function SVGGraphics_setStrokeRGBColor(r, g, b) {\n      var color = Util.makeCssRgb(r, g, b);\n      this.current.strokeColor = color;\n    },\n    setFillAlpha: function SVGGraphics_setFillAlpha(fillAlpha) {\n      this.current.fillAlpha = fillAlpha;\n    },\n    setFillRGBColor: function SVGGraphics_setFillRGBColor(r, g, b) {\n      var color = Util.makeCssRgb(r, g, b);\n      this.current.fillColor = color;\n      this.current.tspan = this.svgFactory.createElement('svg:tspan');\n      this.current.xcoords = [];\n    },\n    setDash: function SVGGraphics_setDash(dashArray, dashPhase) {\n      this.current.dashArray = dashArray;\n      this.current.dashPhase = dashPhase;\n    },\n\n    constructPath: function SVGGraphics_constructPath(ops, args) {\n      var current = this.current;\n      var x = current.x, y = current.y;\n      current.path = this.svgFactory.createElement('svg:path');\n      var d = [];\n      var opLength = ops.length;\n\n      for (var i = 0, j = 0; i < opLength; i++) {\n        switch (ops[i] | 0) {\n          case OPS.rectangle:\n            x = args[j++];\n            y = args[j++];\n            var width = args[j++];\n            var height = args[j++];\n            var xw = x + width;\n            var yh = y + height;\n            d.push('M', pf(x), pf(y), 'L', pf(xw), pf(y), 'L', pf(xw), pf(yh),\n                   'L', pf(x), pf(yh), 'Z');\n            break;\n          case OPS.moveTo:\n            x = args[j++];\n            y = args[j++];\n            d.push('M', pf(x), pf(y));\n            break;\n          case OPS.lineTo:\n            x = args[j++];\n            y = args[j++];\n            d.push('L', pf(x), pf(y));\n            break;\n          case OPS.curveTo:\n            x = args[j + 4];\n            y = args[j + 5];\n            d.push('C', pf(args[j]), pf(args[j + 1]), pf(args[j + 2]),\n                   pf(args[j + 3]), pf(x), pf(y));\n            j += 6;\n            break;\n          case OPS.curveTo2:\n            x = args[j + 2];\n            y = args[j + 3];\n            d.push('C', pf(x), pf(y), pf(args[j]), pf(args[j + 1]),\n                   pf(args[j + 2]), pf(args[j + 3]));\n            j += 4;\n            break;\n          case OPS.curveTo3:\n            x = args[j + 2];\n            y = args[j + 3];\n            d.push('C', pf(args[j]), pf(args[j + 1]), pf(x), pf(y),\n                   pf(x), pf(y));\n            j += 4;\n            break;\n          case OPS.closePath:\n            d.push('Z');\n            break;\n        }\n      }\n      current.path.setAttributeNS(null, 'd', d.join(' '));\n      current.path.setAttributeNS(null, 'fill', 'none');\n\n      this._ensureTransformGroup().appendChild(current.path);\n\n      // Saving a reference in current.element so that it can be addressed\n      // in 'fill' and 'stroke'\n      current.element = current.path;\n      current.setCurrentPoint(x, y);\n    },\n\n    endPath: function SVGGraphics_endPath() {\n      if (!this.pendingClip) {\n        return;\n      }\n      var current = this.current;\n      // Add current path to clipping path\n      var clipId = 'clippath' + clipCount;\n      clipCount++;\n      var clipPath = this.svgFactory.createElement('svg:clipPath');\n      clipPath.setAttributeNS(null, 'id', clipId);\n      clipPath.setAttributeNS(null, 'transform', pm(this.transformMatrix));\n      // A deep clone is needed when text is used as a clipping path.\n      const clipElement = current.element.cloneNode(true);\n      if (this.pendingClip === 'evenodd') {\n        clipElement.setAttributeNS(null, 'clip-rule', 'evenodd');\n      } else {\n        clipElement.setAttributeNS(null, 'clip-rule', 'nonzero');\n      }\n      this.pendingClip = null;\n      clipPath.appendChild(clipElement);\n      this.defs.appendChild(clipPath);\n\n      if (current.activeClipUrl) {\n        // The previous clipping group content can go out of order -- resetting\n        // cached clipGroups.\n        current.clipGroup = null;\n        this.extraStack.forEach(function (prev) {\n          prev.clipGroup = null;\n        });\n        // Intersect with the previous clipping path.\n        clipPath.setAttributeNS(null, 'clip-path', current.activeClipUrl);\n      }\n      current.activeClipUrl = 'url(#' + clipId + ')';\n\n      this.tgrp = null;\n    },\n\n    clip: function SVGGraphics_clip(type) {\n      this.pendingClip = type;\n    },\n\n    closePath: function SVGGraphics_closePath() {\n      var current = this.current;\n      if (current.path) {\n        var d = current.path.getAttributeNS(null, 'd');\n        d += 'Z';\n        current.path.setAttributeNS(null, 'd', d);\n      }\n    },\n\n    setLeading: function SVGGraphics_setLeading(leading) {\n      this.current.leading = -leading;\n    },\n\n    setTextRise: function SVGGraphics_setTextRise(textRise) {\n      this.current.textRise = textRise;\n    },\n\n    setTextRenderingMode(textRenderingMode) {\n      this.current.textRenderingMode = textRenderingMode;\n    },\n\n    setHScale: function SVGGraphics_setHScale(scale) {\n      this.current.textHScale = scale / 100;\n    },\n\n    setGState: function SVGGraphics_setGState(states) {\n      for (var i = 0, ii = states.length; i < ii; i++) {\n        var state = states[i];\n        var key = state[0];\n        var value = state[1];\n\n        switch (key) {\n          case 'LW':\n            this.setLineWidth(value);\n            break;\n          case 'LC':\n            this.setLineCap(value);\n            break;\n          case 'LJ':\n            this.setLineJoin(value);\n            break;\n          case 'ML':\n            this.setMiterLimit(value);\n            break;\n          case 'D':\n            this.setDash(value[0], value[1]);\n            break;\n          case 'Font':\n            this.setFont(value);\n            break;\n          case 'CA':\n            this.setStrokeAlpha(value);\n            break;\n          case 'ca':\n            this.setFillAlpha(value);\n            break;\n          default:\n            warn('Unimplemented graphic state ' + key);\n            break;\n        }\n      }\n    },\n\n    fill: function SVGGraphics_fill() {\n      var current = this.current;\n      if (current.element) {\n        current.element.setAttributeNS(null, 'fill', current.fillColor);\n        current.element.setAttributeNS(null, 'fill-opacity', current.fillAlpha);\n        this.endPath();\n      }\n    },\n\n    stroke: function SVGGraphics_stroke() {\n      var current = this.current;\n\n      if (current.element) {\n        this._setStrokeAttributes(current.element);\n\n        current.element.setAttributeNS(null, 'fill', 'none');\n\n        this.endPath();\n      }\n    },\n\n    /**\n     * @private\n     */\n    _setStrokeAttributes(element) {\n      const current = this.current;\n      element.setAttributeNS(null, 'stroke', current.strokeColor);\n      element.setAttributeNS(null, 'stroke-opacity', current.strokeAlpha);\n      element.setAttributeNS(null, 'stroke-miterlimit',\n                             pf(current.miterLimit));\n      element.setAttributeNS(null, 'stroke-linecap', current.lineCap);\n      element.setAttributeNS(null, 'stroke-linejoin', current.lineJoin);\n      element.setAttributeNS(null, 'stroke-width',\n                             pf(current.lineWidth) + 'px');\n      element.setAttributeNS(null, 'stroke-dasharray',\n                             current.dashArray.map(pf).join(' '));\n      element.setAttributeNS(null, 'stroke-dashoffset',\n                             pf(current.dashPhase) + 'px');\n    },\n\n    eoFill: function SVGGraphics_eoFill() {\n      if (this.current.element) {\n        this.current.element.setAttributeNS(null, 'fill-rule', 'evenodd');\n      }\n      this.fill();\n    },\n\n    fillStroke: function SVGGraphics_fillStroke() {\n      // Order is important since stroke wants fill to be none.\n      // First stroke, then if fill needed, it will be overwritten.\n      this.stroke();\n      this.fill();\n    },\n\n    eoFillStroke: function SVGGraphics_eoFillStroke() {\n      if (this.current.element) {\n        this.current.element.setAttributeNS(null, 'fill-rule', 'evenodd');\n      }\n      this.fillStroke();\n    },\n\n    closeStroke: function SVGGraphics_closeStroke() {\n      this.closePath();\n      this.stroke();\n    },\n\n    closeFillStroke: function SVGGraphics_closeFillStroke() {\n      this.closePath();\n      this.fillStroke();\n    },\n\n    closeEOFillStroke() {\n      this.closePath();\n      this.eoFillStroke();\n    },\n\n    paintSolidColorImageMask:\n        function SVGGraphics_paintSolidColorImageMask() {\n      var current = this.current;\n      var rect = this.svgFactory.createElement('svg:rect');\n      rect.setAttributeNS(null, 'x', '0');\n      rect.setAttributeNS(null, 'y', '0');\n      rect.setAttributeNS(null, 'width', '1px');\n      rect.setAttributeNS(null, 'height', '1px');\n      rect.setAttributeNS(null, 'fill', current.fillColor);\n\n      this._ensureTransformGroup().appendChild(rect);\n    },\n\n    paintJpegXObject: function SVGGraphics_paintJpegXObject(objId, w, h) {\n      var imgObj = this.objs.get(objId);\n      var imgEl = this.svgFactory.createElement('svg:image');\n      imgEl.setAttributeNS(XLINK_NS, 'xlink:href', imgObj.src);\n      imgEl.setAttributeNS(null, 'width', pf(w));\n      imgEl.setAttributeNS(null, 'height', pf(h));\n      imgEl.setAttributeNS(null, 'x', '0');\n      imgEl.setAttributeNS(null, 'y', pf(-h));\n      imgEl.setAttributeNS(null, 'transform',\n                           'scale(' + pf(1 / w) + ' ' + pf(-1 / h) + ')');\n\n      this._ensureTransformGroup().appendChild(imgEl);\n    },\n\n    paintImageXObject: function SVGGraphics_paintImageXObject(objId) {\n      var imgData = this.objs.get(objId);\n      if (!imgData) {\n        warn('Dependent image isn\\'t ready yet');\n        return;\n      }\n      this.paintInlineImageXObject(imgData);\n    },\n\n    paintInlineImageXObject:\n        function SVGGraphics_paintInlineImageXObject(imgData, mask) {\n      var width = imgData.width;\n      var height = imgData.height;\n\n      var imgSrc = convertImgDataToPng(imgData, this.forceDataSchema, !!mask);\n      var cliprect = this.svgFactory.createElement('svg:rect');\n      cliprect.setAttributeNS(null, 'x', '0');\n      cliprect.setAttributeNS(null, 'y', '0');\n      cliprect.setAttributeNS(null, 'width', pf(width));\n      cliprect.setAttributeNS(null, 'height', pf(height));\n      this.current.element = cliprect;\n      this.clip('nonzero');\n      var imgEl = this.svgFactory.createElement('svg:image');\n      imgEl.setAttributeNS(XLINK_NS, 'xlink:href', imgSrc);\n      imgEl.setAttributeNS(null, 'x', '0');\n      imgEl.setAttributeNS(null, 'y', pf(-height));\n      imgEl.setAttributeNS(null, 'width', pf(width) + 'px');\n      imgEl.setAttributeNS(null, 'height', pf(height) + 'px');\n      imgEl.setAttributeNS(null, 'transform',\n                           'scale(' + pf(1 / width) + ' ' +\n                           pf(-1 / height) + ')');\n      if (mask) {\n        mask.appendChild(imgEl);\n      } else {\n        this._ensureTransformGroup().appendChild(imgEl);\n      }\n    },\n\n    paintImageMaskXObject:\n        function SVGGraphics_paintImageMaskXObject(imgData) {\n      var current = this.current;\n      var width = imgData.width;\n      var height = imgData.height;\n      var fillColor = current.fillColor;\n\n      current.maskId = 'mask' + maskCount++;\n      var mask = this.svgFactory.createElement('svg:mask');\n      mask.setAttributeNS(null, 'id', current.maskId);\n\n      var rect = this.svgFactory.createElement('svg:rect');\n      rect.setAttributeNS(null, 'x', '0');\n      rect.setAttributeNS(null, 'y', '0');\n      rect.setAttributeNS(null, 'width', pf(width));\n      rect.setAttributeNS(null, 'height', pf(height));\n      rect.setAttributeNS(null, 'fill', fillColor);\n      rect.setAttributeNS(null, 'mask', 'url(#' + current.maskId + ')');\n      this.defs.appendChild(mask);\n\n      this._ensureTransformGroup().appendChild(rect);\n\n      this.paintInlineImageXObject(imgData, mask);\n    },\n\n    paintFormXObjectBegin:\n        function SVGGraphics_paintFormXObjectBegin(matrix, bbox) {\n      if (Array.isArray(matrix) && matrix.length === 6) {\n        this.transform(matrix[0], matrix[1], matrix[2],\n                       matrix[3], matrix[4], matrix[5]);\n      }\n\n      if (bbox) {\n        var width = bbox[2] - bbox[0];\n        var height = bbox[3] - bbox[1];\n\n        var cliprect = this.svgFactory.createElement('svg:rect');\n        cliprect.setAttributeNS(null, 'x', bbox[0]);\n        cliprect.setAttributeNS(null, 'y', bbox[1]);\n        cliprect.setAttributeNS(null, 'width', pf(width));\n        cliprect.setAttributeNS(null, 'height', pf(height));\n        this.current.element = cliprect;\n        this.clip('nonzero');\n        this.endPath();\n      }\n    },\n\n    paintFormXObjectEnd:\n        function SVGGraphics_paintFormXObjectEnd() {},\n\n    /**\n     * @private\n     */\n    _initialize(viewport) {\n      let svg = this.svgFactory.create(viewport.width, viewport.height);\n\n      // Create the definitions element.\n      let definitions = this.svgFactory.createElement('svg:defs');\n      svg.appendChild(definitions);\n      this.defs = definitions;\n\n      // Create the root group element, which acts a container for all other\n      // groups and applies the viewport transform.\n      let rootGroup = this.svgFactory.createElement('svg:g');\n      rootGroup.setAttributeNS(null, 'transform', pm(viewport.transform));\n      svg.appendChild(rootGroup);\n\n      // For the construction of the SVG image we are only interested in the\n      // root group, so we expose it as the entry point of the SVG image for\n      // the other code in this class.\n      this.svg = rootGroup;\n\n      return svg;\n    },\n\n    /**\n     * @private\n     */\n    _ensureClipGroup: function SVGGraphics_ensureClipGroup() {\n      if (!this.current.clipGroup) {\n        var clipGroup = this.svgFactory.createElement('svg:g');\n        clipGroup.setAttributeNS(null, 'clip-path',\n                                 this.current.activeClipUrl);\n        this.svg.appendChild(clipGroup);\n        this.current.clipGroup = clipGroup;\n      }\n      return this.current.clipGroup;\n    },\n\n    /**\n     * @private\n     */\n    _ensureTransformGroup: function SVGGraphics_ensureTransformGroup() {\n      if (!this.tgrp) {\n        this.tgrp = this.svgFactory.createElement('svg:g');\n        this.tgrp.setAttributeNS(null, 'transform', pm(this.transformMatrix));\n        if (this.current.activeClipUrl) {\n          this._ensureClipGroup().appendChild(this.tgrp);\n        } else {\n          this.svg.appendChild(this.tgrp);\n        }\n      }\n      return this.tgrp;\n    },\n  };\n  return SVGGraphics;\n})();\n\n}\n\nexport {\n  SVGGraphics,\n};\n","/* Copyright 2012 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n/* globals __non_webpack_require__ */\n\nlet fs = __non_webpack_require__('fs');\nlet http = __non_webpack_require__('http');\nlet https = __non_webpack_require__('https');\nlet url = __non_webpack_require__('url');\n\nimport {\n  AbortException, assert, createPromiseCapability, MissingPDFException\n} from '../shared/util';\nimport {\n  extractFilenameFromHeader, validateRangeRequestCapabilities\n} from './network_utils';\n\nconst fileUriRegex = /^file:\\/\\/\\/[a-zA-Z]:\\//;\n\nfunction parseUrl(sourceUrl) {\n  let parsedUrl = url.parse(sourceUrl);\n  if (parsedUrl.protocol === 'file:' || parsedUrl.host) {\n    return parsedUrl;\n  }\n  // Prepending 'file:///' to Windows absolute path.\n  if (/^[a-z]:[/\\\\]/i.test(sourceUrl)) {\n    return url.parse(`file:///${sourceUrl}`);\n  }\n  // Changes protocol to 'file:' if url refers to filesystem.\n  if (!parsedUrl.host) {\n    parsedUrl.protocol = 'file:';\n  }\n  return parsedUrl;\n}\n\nclass PDFNodeStream {\n  constructor(source) {\n    this.source = source;\n    this.url = parseUrl(source.url);\n    this.isHttp = this.url.protocol === 'http:' ||\n                  this.url.protocol === 'https:';\n    // Check if url refers to filesystem.\n    this.isFsUrl = this.url.protocol === 'file:';\n    this.httpHeaders = (this.isHttp && source.httpHeaders) || {};\n\n    this._fullRequest = null;\n    this._rangeRequestReaders = [];\n  }\n\n  getFullReader() {\n    assert(!this._fullRequest);\n    this._fullRequest = this.isFsUrl ?\n      new PDFNodeStreamFsFullReader(this) :\n      new PDFNodeStreamFullReader(this);\n    return this._fullRequest;\n  }\n\n  getRangeReader(start, end) {\n    let rangeReader = this.isFsUrl ?\n      new PDFNodeStreamFsRangeReader(this, start, end) :\n      new PDFNodeStreamRangeReader(this, start, end);\n    this._rangeRequestReaders.push(rangeReader);\n    return rangeReader;\n  }\n\n  cancelAllRequests(reason) {\n    if (this._fullRequest) {\n      this._fullRequest.cancel(reason);\n    }\n\n    let readers = this._rangeRequestReaders.slice(0);\n    readers.forEach(function(reader) {\n      reader.cancel(reason);\n    });\n  }\n}\n\nclass BaseFullReader {\n  constructor(stream) {\n    this._url = stream.url;\n    this._done = false;\n    this._storedError = null;\n    this.onProgress = null;\n    let source = stream.source;\n    this._contentLength = source.length; // optional\n    this._loaded = 0;\n    this._filename = null;\n\n    this._disableRange = source.disableRange || false;\n    this._rangeChunkSize = source.rangeChunkSize;\n    if (!this._rangeChunkSize && !this._disableRange) {\n      this._disableRange = true;\n    }\n\n    this._isStreamingSupported = !source.disableStream;\n    this._isRangeSupported = !source.disableRange;\n\n    this._readableStream = null;\n    this._readCapability = createPromiseCapability();\n    this._headersCapability = createPromiseCapability();\n  }\n\n  get headersReady() {\n    return this._headersCapability.promise;\n  }\n\n  get filename() {\n    return this._filename;\n  }\n\n  get contentLength() {\n    return this._contentLength;\n  }\n\n  get isRangeSupported() {\n    return this._isRangeSupported;\n  }\n\n  get isStreamingSupported() {\n    return this._isStreamingSupported;\n  }\n\n  async read() {\n    await this._readCapability.promise;\n    if (this._done) {\n      return { value: undefined, done: true, };\n    }\n    if (this._storedError) {\n      throw this._storedError;\n    }\n\n    let chunk = this._readableStream.read();\n    if (chunk === null) {\n      this._readCapability = createPromiseCapability();\n      return this.read();\n    }\n    this._loaded += chunk.length;\n    if (this.onProgress) {\n      this.onProgress({\n        loaded: this._loaded,\n        total: this._contentLength,\n      });\n    }\n    // Ensure that `read()` method returns ArrayBuffer.\n    let buffer = new Uint8Array(chunk).buffer;\n    return { value: buffer, done: false, };\n  }\n\n  cancel(reason) {\n    // Call `this._error()` method when cancel is called\n    // before _readableStream is set.\n    if (!this._readableStream) {\n      this._error(reason);\n      return;\n    }\n    this._readableStream.destroy(reason);\n  }\n\n  _error(reason) {\n    this._storedError = reason;\n    this._readCapability.resolve();\n  }\n\n  _setReadableStream(readableStream) {\n    this._readableStream = readableStream;\n    readableStream.on('readable', () => {\n      this._readCapability.resolve();\n    });\n\n    readableStream.on('end', () => {\n      // Destroy readable to minimize resource usage.\n      readableStream.destroy();\n      this._done = true;\n      this._readCapability.resolve();\n    });\n\n    readableStream.on('error', (reason) => {\n      this._error(reason);\n    });\n\n    // We need to stop reading when range is supported and streaming is\n    // disabled.\n    if (!this._isStreamingSupported && this._isRangeSupported) {\n      this._error(new AbortException('streaming is disabled'));\n    }\n\n    // Destroy ReadableStream if already in errored state.\n    if (this._storedError) {\n      this._readableStream.destroy(this._storedError);\n    }\n  }\n}\n\nclass BaseRangeReader {\n  constructor(stream) {\n    this._url = stream.url;\n    this._done = false;\n    this._storedError = null;\n    this.onProgress = null;\n    this._loaded = 0;\n    this._readableStream = null;\n    this._readCapability = createPromiseCapability();\n    let source = stream.source;\n    this._isStreamingSupported = !source.disableStream;\n  }\n\n  get isStreamingSupported() {\n    return this._isStreamingSupported;\n  }\n\n  async read() {\n    await this._readCapability.promise;\n    if (this._done) {\n      return { value: undefined, done: true, };\n    }\n    if (this._storedError) {\n      throw this._storedError;\n    }\n\n    let chunk = this._readableStream.read();\n    if (chunk === null) {\n      this._readCapability = createPromiseCapability();\n      return this.read();\n    }\n    this._loaded += chunk.length;\n    if (this.onProgress) {\n      this.onProgress({ loaded: this._loaded, });\n    }\n    // Ensure that `read()` method returns ArrayBuffer.\n    let buffer = new Uint8Array(chunk).buffer;\n    return { value: buffer, done: false, };\n  }\n\n  cancel(reason) {\n    // Call `this._error()` method when cancel is called\n    // before _readableStream is set.\n    if (!this._readableStream) {\n      this._error(reason);\n      return;\n    }\n    this._readableStream.destroy(reason);\n  }\n\n  _error(reason) {\n    this._storedError = reason;\n    this._readCapability.resolve();\n  }\n\n  _setReadableStream(readableStream) {\n    this._readableStream = readableStream;\n    readableStream.on('readable', () => {\n      this._readCapability.resolve();\n    });\n\n    readableStream.on('end', () => {\n      // Destroy readableStream to minimize resource usage.\n      readableStream.destroy();\n      this._done = true;\n      this._readCapability.resolve();\n    });\n\n    readableStream.on('error', (reason) => {\n      this._error(reason);\n    });\n\n    // Destroy readableStream if already in errored state.\n    if (this._storedError) {\n      this._readableStream.destroy(this._storedError);\n    }\n  }\n}\n\nfunction createRequestOptions(url, headers) {\n  return {\n    protocol: url.protocol,\n    auth: url.auth,\n    host: url.hostname,\n    port: url.port,\n    path: url.path,\n    method: 'GET',\n    headers,\n  };\n}\n\nclass PDFNodeStreamFullReader extends BaseFullReader {\n  constructor(stream) {\n    super(stream);\n\n    let handleResponse = (response) => {\n      if (response.statusCode === 404) {\n        const error = new MissingPDFException(`Missing PDF \"${this._url}\".`);\n        this._storedError = error;\n        this._headersCapability.reject(error);\n        return;\n      }\n      this._headersCapability.resolve();\n      this._setReadableStream(response);\n\n      const getResponseHeader = (name) => {\n        // Make sure that headers name are in lower case, as mentioned\n        // here: https://nodejs.org/api/http.html#http_message_headers.\n        return this._readableStream.headers[name.toLowerCase()];\n      };\n      let { allowRangeRequests, suggestedLength, } =\n        validateRangeRequestCapabilities({\n          getResponseHeader,\n          isHttp: stream.isHttp,\n          rangeChunkSize: this._rangeChunkSize,\n          disableRange: this._disableRange,\n        });\n\n      this._isRangeSupported = allowRangeRequests;\n      // Setting right content length.\n      this._contentLength = suggestedLength || this._contentLength;\n\n      this._filename = extractFilenameFromHeader(getResponseHeader);\n    };\n\n    this._request = null;\n    if (this._url.protocol === 'http:') {\n      this._request = http.request(\n        createRequestOptions(this._url, stream.httpHeaders),\n        handleResponse);\n    } else {\n      this._request = https.request(\n        createRequestOptions(this._url, stream.httpHeaders),\n        handleResponse);\n    }\n\n    this._request.on('error', (reason) => {\n      this._storedError = reason;\n      this._headersCapability.reject(reason);\n    });\n    // Note: `request.end(data)` is used to write `data` to request body\n    // and notify end of request. But one should always call `request.end()`\n    // even if there is no data to write -- (to notify the end of request).\n    this._request.end();\n  }\n}\n\nclass PDFNodeStreamRangeReader extends BaseRangeReader {\n  constructor(stream, start, end) {\n    super(stream);\n\n    this._httpHeaders = {};\n    for (let property in stream.httpHeaders) {\n      let value = stream.httpHeaders[property];\n      if (typeof value === 'undefined') {\n        continue;\n      }\n      this._httpHeaders[property] = value;\n    }\n    this._httpHeaders['Range'] = `bytes=${start}-${end - 1}`;\n\n    let handleResponse = (response) => {\n      if (response.statusCode === 404) {\n        const error = new MissingPDFException(`Missing PDF \"${this._url}\".`);\n        this._storedError = error;\n        return;\n      }\n      this._setReadableStream(response);\n    };\n\n    this._request = null;\n    if (this._url.protocol === 'http:') {\n      this._request = http.request(\n        createRequestOptions(this._url, this._httpHeaders),\n        handleResponse);\n    } else {\n      this._request = https.request(\n        createRequestOptions(this._url, this._httpHeaders),\n        handleResponse);\n    }\n\n    this._request.on('error', (reason) => {\n      this._storedError = reason;\n    });\n    this._request.end();\n  }\n}\n\nclass PDFNodeStreamFsFullReader extends BaseFullReader {\n  constructor(stream) {\n    super(stream);\n\n    let path = decodeURIComponent(this._url.path);\n\n    // Remove the extra slash to get right path from url like `file:///C:/`\n    if (fileUriRegex.test(this._url.href)) {\n      path = path.replace(/^\\//, '');\n    }\n\n    fs.lstat(path, (error, stat) => {\n      if (error) {\n        if (error.code === 'ENOENT') {\n          error = new MissingPDFException(`Missing PDF \"${path}\".`);\n        }\n        this._storedError = error;\n        this._headersCapability.reject(error);\n        return;\n      }\n      // Setting right content length.\n      this._contentLength = stat.size;\n\n      this._setReadableStream(fs.createReadStream(path));\n      this._headersCapability.resolve();\n    });\n  }\n}\n\nclass PDFNodeStreamFsRangeReader extends BaseRangeReader {\n  constructor(stream, start, end) {\n    super(stream);\n\n    let path = decodeURIComponent(this._url.path);\n\n    // Remove the extra slash to get right path from url like `file:///C:/`\n    if (fileUriRegex.test(this._url.href)) {\n      path = path.replace(/^\\//, '');\n    }\n\n    this._setReadableStream(\n      fs.createReadStream(path, { start, end: end - 1, }));\n  }\n}\n\nexport {\n  PDFNodeStream,\n};\n","/* Copyright 2012 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport {\n  assert, MissingPDFException, UnexpectedResponseException\n} from '../shared/util';\nimport {\n  getFilenameFromContentDispositionHeader\n} from './content_disposition';\n\nfunction validateRangeRequestCapabilities({ getResponseHeader, isHttp,\n                                            rangeChunkSize, disableRange, }) {\n  assert(rangeChunkSize > 0, 'Range chunk size must be larger than zero');\n  let returnValues = {\n    allowRangeRequests: false,\n    suggestedLength: undefined,\n  };\n\n  let length = parseInt(getResponseHeader('Content-Length'), 10);\n  if (!Number.isInteger(length)) {\n    return returnValues;\n  }\n\n  returnValues.suggestedLength = length;\n\n  if (length <= 2 * rangeChunkSize) {\n    // The file size is smaller than the size of two chunks, so it does not\n    // make any sense to abort the request and retry with a range request.\n    return returnValues;\n  }\n\n  if (disableRange || !isHttp) {\n    return returnValues;\n  }\n  if (getResponseHeader('Accept-Ranges') !== 'bytes') {\n    return returnValues;\n  }\n\n  let contentEncoding = getResponseHeader('Content-Encoding') || 'identity';\n  if (contentEncoding !== 'identity') {\n    return returnValues;\n  }\n\n  returnValues.allowRangeRequests = true;\n  return returnValues;\n}\n\nfunction extractFilenameFromHeader(getResponseHeader) {\n  const contentDisposition = getResponseHeader('Content-Disposition');\n  if (contentDisposition) {\n    let filename = getFilenameFromContentDispositionHeader(contentDisposition);\n    if (/\\.pdf$/i.test(filename)) {\n      return filename;\n    }\n  }\n  return null;\n}\n\nfunction createResponseStatusError(status, url) {\n  if (status === 404 || status === 0 && /^file:/.test(url)) {\n    return new MissingPDFException('Missing PDF \"' + url + '\".');\n  }\n  return new UnexpectedResponseException(\n    'Unexpected server response (' + status +\n    ') while retrieving PDF \"' + url + '\".', status);\n}\n\nfunction validateResponseStatus(status) {\n  return status === 200 || status === 206;\n}\n\nexport {\n  createResponseStatusError,\n  extractFilenameFromHeader,\n  validateRangeRequestCapabilities,\n  validateResponseStatus,\n};\n","/* Copyright 2017 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n// This getFilenameFromContentDispositionHeader function is adapted from\n// https://github.com/Rob--W/open-in-browser/blob/7e2e35a38b8b4e981b11da7b2f01df0149049e92/extension/content-disposition.js\n// with the following changes:\n// - Modified to conform to PDF.js's coding style.\n// - Support UTF-8 decoding when TextDecoder is unsupported.\n// - Move return to the end of the function to prevent Babel from dropping the\n//   function declarations.\n\n/**\n * Extract file name from the Content-Disposition HTTP response header.\n *\n * @param {string} contentDisposition\n * @return {string} Filename, if found in the Content-Disposition header.\n */\nfunction getFilenameFromContentDispositionHeader(contentDisposition) {\n  let needsEncodingFixup = true;\n\n  // filename*=ext-value (\"ext-value\" from RFC 5987, referenced by RFC 6266).\n  let tmp = toParamRegExp('filename\\\\*', 'i').exec(contentDisposition);\n  if (tmp) {\n    tmp = tmp[1];\n    let filename = rfc2616unquote(tmp);\n    filename = unescape(filename);\n    filename = rfc5987decode(filename);\n    filename = rfc2047decode(filename);\n    return fixupEncoding(filename);\n  }\n\n  // Continuations (RFC 2231 section 3, referenced by RFC 5987 section 3.1).\n  // filename*n*=part\n  // filename*n=part\n  tmp = rfc2231getparam(contentDisposition);\n  if (tmp) {\n    // RFC 2047, section\n    let filename = rfc2047decode(tmp);\n    return fixupEncoding(filename);\n  }\n\n  // filename=value (RFC 5987, section 4.1).\n  tmp = toParamRegExp('filename', 'i').exec(contentDisposition);\n  if (tmp) {\n    tmp = tmp[1];\n    let filename = rfc2616unquote(tmp);\n    filename = rfc2047decode(filename);\n    return fixupEncoding(filename);\n  }\n\n  // After this line there are only function declarations. We cannot put\n  // \"return\" here for readability because babel would then drop the function\n  // declarations...\n  function toParamRegExp(attributePattern, flags) {\n    return new RegExp(\n      '(?:^|;)\\\\s*' + attributePattern + '\\\\s*=\\\\s*' +\n      // Captures: value = token | quoted-string\n      // (RFC 2616, section 3.6 and referenced by RFC 6266 4.1)\n      '(' +\n        '[^\";\\\\s][^;\\\\s]*' +\n      '|' +\n        '\"(?:[^\"\\\\\\\\]|\\\\\\\\\"?)+\"?' +\n      ')', flags);\n  }\n  function textdecode(encoding, value) {\n    if (encoding) {\n      if (!/^[\\x00-\\xFF]+$/.test(value)) {\n        return value;\n      }\n      try {\n        let decoder = new TextDecoder(encoding, { fatal: true, });\n        let bytes = Array.from(value, function(ch) {\n          return ch.charCodeAt(0) & 0xFF;\n        });\n        value = decoder.decode(new Uint8Array(bytes));\n        needsEncodingFixup = false;\n      } catch (e) {\n        // TextDecoder constructor threw - unrecognized encoding.\n        // Or TextDecoder API is not available (in IE / Edge).\n        if (/^utf-?8$/i.test(encoding)) {\n          // UTF-8 is commonly used, try to support it in another way:\n          try {\n            value = decodeURIComponent(escape(value));\n            needsEncodingFixup = false;\n          } catch (err) {\n          }\n        }\n      }\n    }\n    return value;\n  }\n  function fixupEncoding(value) {\n    if (needsEncodingFixup && /[\\x80-\\xff]/.test(value)) {\n      // Maybe multi-byte UTF-8.\n      value = textdecode('utf-8', value);\n      if (needsEncodingFixup) {\n        // Try iso-8859-1 encoding.\n        value = textdecode('iso-8859-1', value);\n      }\n    }\n    return value;\n  }\n  function rfc2231getparam(contentDisposition) {\n    let matches = [], match;\n    // Iterate over all filename*n= and filename*n*= with n being an integer\n    // of at least zero. Any non-zero number must not start with '0'.\n    let iter = toParamRegExp('filename\\\\*((?!0\\\\d)\\\\d+)(\\\\*?)', 'ig');\n    while ((match = iter.exec(contentDisposition)) !== null) {\n      let [, n, quot, part] = match;\n      n = parseInt(n, 10);\n      if (n in matches) {\n        // Ignore anything after the invalid second filename*0.\n        if (n === 0) {\n          break;\n        }\n        continue;\n      }\n      matches[n] = [quot, part];\n    }\n    let parts = [];\n    for (let n = 0; n < matches.length; ++n) {\n      if (!(n in matches)) {\n        // Numbers must be consecutive. Truncate when there is a hole.\n        break;\n      }\n      let [quot, part] = matches[n];\n      part = rfc2616unquote(part);\n      if (quot) {\n        part = unescape(part);\n        if (n === 0) {\n          part = rfc5987decode(part);\n        }\n      }\n      parts.push(part);\n    }\n    return parts.join('');\n  }\n  function rfc2616unquote(value) {\n    if (value.startsWith('\"')) {\n      let parts = value.slice(1).split('\\\\\"');\n      // Find the first unescaped \" and terminate there.\n      for (let i = 0; i < parts.length; ++i) {\n        let quotindex = parts[i].indexOf('\"');\n        if (quotindex !== -1) {\n          parts[i] = parts[i].slice(0, quotindex);\n          parts.length = i + 1; // Truncates and stop the iteration.\n        }\n        parts[i] = parts[i].replace(/\\\\(.)/g, '$1');\n      }\n      value = parts.join('\"');\n    }\n    return value;\n  }\n  function rfc5987decode(extvalue) {\n    // Decodes \"ext-value\" from RFC 5987.\n    let encodingend = extvalue.indexOf('\\'');\n    if (encodingend === -1) {\n      // Some servers send \"filename*=\" without encoding 'language' prefix,\n      // e.g. in https://github.com/Rob--W/open-in-browser/issues/26\n      // Let's accept the value like Firefox (57) (Chrome 62 rejects it).\n      return extvalue;\n    }\n    let encoding = extvalue.slice(0, encodingend);\n    let langvalue = extvalue.slice(encodingend + 1);\n    // Ignore language (RFC 5987 section 3.2.1, and RFC 6266 section 4.1 ).\n    let value = langvalue.replace(/^[^']*'/, '');\n    return textdecode(encoding, value);\n  }\n  function rfc2047decode(value) {\n    // RFC 2047-decode the result. Firefox tried to drop support for it, but\n    // backed out because some servers use it - https://bugzil.la/875615\n    // Firefox's condition for decoding is here: https://searchfox.org/mozilla-central/rev/4a590a5a15e35d88a3b23dd6ac3c471cf85b04a8/netwerk/mime/nsMIMEHeaderParamImpl.cpp#742-748\n\n    // We are more strict and only recognize RFC 2047-encoding if the value\n    // starts with \"=?\", since then it is likely that the full value is\n    // RFC 2047-encoded.\n\n    // Firefox also decodes words even where RFC 2047 section 5 states:\n    // \"An 'encoded-word' MUST NOT appear within a 'quoted-string'.\"\n    if (!value.startsWith('=?') || /[\\x00-\\x19\\x80-\\xff]/.test(value)) {\n      return value;\n    }\n    // RFC 2047, section 2.4\n    // encoded-word = \"=?\" charset \"?\" encoding \"?\" encoded-text \"?=\"\n    // charset = token (but let's restrict to characters that denote a\n    //       possibly valid encoding).\n    // encoding = q or b\n    // encoded-text = any printable ASCII character other than ? or space.\n    //        ... but Firefox permits ? and space.\n    return value.replace(/=\\?([\\w-]*)\\?([QqBb])\\?((?:[^?]|\\?(?!=))*)\\?=/g,\n      function(_, charset, encoding, text) {\n        if (encoding === 'q' || encoding === 'Q') {\n          // RFC 2047 section 4.2.\n          text = text.replace(/_/g, ' ');\n          text = text.replace(/=([0-9a-fA-F]{2})/g, function(_, hex) {\n            return String.fromCharCode(parseInt(hex, 16));\n          });\n          return textdecode(charset, text);\n        } // else encoding is b or B - base64 (RFC 2047 section 4.1)\n        try {\n          text = atob(text);\n        } catch (e) {\n        }\n        return textdecode(charset, text);\n      });\n  }\n\n  return '';\n}\n\nexport {\n  getFilenameFromContentDispositionHeader,\n};\n","/* Copyright 2012 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport {\n  AbortException, assert, createPromiseCapability\n} from '../shared/util';\nimport {\n  createResponseStatusError, extractFilenameFromHeader,\n  validateRangeRequestCapabilities, validateResponseStatus\n} from './network_utils';\n\nfunction createFetchOptions(headers, withCredentials, abortController) {\n  return {\n    method: 'GET',\n    headers,\n    signal: abortController && abortController.signal,\n    mode: 'cors',\n    credentials: withCredentials ? 'include' : 'same-origin',\n    redirect: 'follow',\n  };\n}\n\nclass PDFFetchStream {\n  constructor(source) {\n    this.source = source;\n    this.isHttp = /^https?:/i.test(source.url);\n    this.httpHeaders = (this.isHttp && source.httpHeaders) || {};\n\n    this._fullRequestReader = null;\n    this._rangeRequestReaders = [];\n  }\n\n  getFullReader() {\n    assert(!this._fullRequestReader);\n    this._fullRequestReader = new PDFFetchStreamReader(this);\n    return this._fullRequestReader;\n  }\n\n  getRangeReader(begin, end) {\n    let reader = new PDFFetchStreamRangeReader(this, begin, end);\n    this._rangeRequestReaders.push(reader);\n    return reader;\n  }\n\n  cancelAllRequests(reason) {\n    if (this._fullRequestReader) {\n      this._fullRequestReader.cancel(reason);\n    }\n    let readers = this._rangeRequestReaders.slice(0);\n    readers.forEach(function(reader) {\n      reader.cancel(reason);\n    });\n  }\n}\n\nclass PDFFetchStreamReader {\n  constructor(stream) {\n    this._stream = stream;\n    this._reader = null;\n    this._loaded = 0;\n    this._filename = null;\n    let source = stream.source;\n    this._withCredentials = source.withCredentials;\n    this._contentLength = source.length;\n    this._headersCapability = createPromiseCapability();\n    this._disableRange = source.disableRange || false;\n    this._rangeChunkSize = source.rangeChunkSize;\n    if (!this._rangeChunkSize && !this._disableRange) {\n      this._disableRange = true;\n    }\n\n    if (typeof AbortController !== 'undefined') {\n      this._abortController = new AbortController();\n    }\n    this._isStreamingSupported = !source.disableStream;\n    this._isRangeSupported = !source.disableRange;\n\n    this._headers = new Headers();\n    for (let property in this._stream.httpHeaders) {\n      let value = this._stream.httpHeaders[property];\n      if (typeof value === 'undefined') {\n        continue;\n      }\n      this._headers.append(property, value);\n    }\n\n    let url = source.url;\n    fetch(url, createFetchOptions(this._headers, this._withCredentials,\n        this._abortController)).then((response) => {\n      if (!validateResponseStatus(response.status)) {\n        throw createResponseStatusError(response.status, url);\n      }\n      this._reader = response.body.getReader();\n      this._headersCapability.resolve();\n\n      const getResponseHeader = (name) => {\n        return response.headers.get(name);\n      };\n      let { allowRangeRequests, suggestedLength, } =\n        validateRangeRequestCapabilities({\n          getResponseHeader,\n          isHttp: this._stream.isHttp,\n          rangeChunkSize: this._rangeChunkSize,\n          disableRange: this._disableRange,\n        });\n\n      this._isRangeSupported = allowRangeRequests;\n      // Setting right content length.\n      this._contentLength = suggestedLength || this._contentLength;\n\n      this._filename = extractFilenameFromHeader(getResponseHeader);\n\n      // We need to stop reading when range is supported and streaming is\n      // disabled.\n      if (!this._isStreamingSupported && this._isRangeSupported) {\n        this.cancel(new AbortException('streaming is disabled'));\n      }\n    }).catch(this._headersCapability.reject);\n\n    this.onProgress = null;\n  }\n\n  get headersReady() {\n    return this._headersCapability.promise;\n  }\n\n  get filename() {\n    return this._filename;\n  }\n\n  get contentLength() {\n    return this._contentLength;\n  }\n\n  get isRangeSupported() {\n    return this._isRangeSupported;\n  }\n\n  get isStreamingSupported() {\n    return this._isStreamingSupported;\n  }\n\n  async read() {\n    await this._headersCapability.promise;\n    const { value, done, } = await this._reader.read();\n    if (done) {\n      return { value, done, };\n    }\n    this._loaded += value.byteLength;\n    if (this.onProgress) {\n      this.onProgress({\n        loaded: this._loaded,\n        total: this._contentLength,\n      });\n    }\n    let buffer = new Uint8Array(value).buffer;\n    return { value: buffer, done: false, };\n  }\n\n  cancel(reason) {\n    if (this._reader) {\n      this._reader.cancel(reason);\n    }\n    if (this._abortController) {\n      this._abortController.abort();\n    }\n  }\n}\n\nclass PDFFetchStreamRangeReader {\n  constructor(stream, begin, end) {\n    this._stream = stream;\n    this._reader = null;\n    this._loaded = 0;\n    let source = stream.source;\n    this._withCredentials = source.withCredentials;\n    this._readCapability = createPromiseCapability();\n    this._isStreamingSupported = !source.disableStream;\n\n    if (typeof AbortController !== 'undefined') {\n      this._abortController = new AbortController();\n    }\n\n    this._headers = new Headers();\n    for (let property in this._stream.httpHeaders) {\n      let value = this._stream.httpHeaders[property];\n      if (typeof value === 'undefined') {\n        continue;\n      }\n      this._headers.append(property, value);\n    }\n\n    let rangeStr = begin + '-' + (end - 1);\n    this._headers.append('Range', 'bytes=' + rangeStr);\n    let url = source.url;\n    fetch(url, createFetchOptions(this._headers, this._withCredentials,\n        this._abortController)).then((response) => {\n      if (!validateResponseStatus(response.status)) {\n        throw createResponseStatusError(response.status, url);\n      }\n      this._readCapability.resolve();\n      this._reader = response.body.getReader();\n    });\n\n    this.onProgress = null;\n  }\n\n  get isStreamingSupported() {\n    return this._isStreamingSupported;\n  }\n\n  async read() {\n    await this._readCapability.promise;\n    const { value, done, } = await this._reader.read();\n    if (done) {\n      return { value, done, };\n    }\n    this._loaded += value.byteLength;\n    if (this.onProgress) {\n      this.onProgress({ loaded: this._loaded, });\n    }\n    let buffer = new Uint8Array(value).buffer;\n    return { value: buffer, done: false, };\n  }\n\n  cancel(reason) {\n    if (this._reader) {\n      this._reader.cancel(reason);\n    }\n    if (this._abortController) {\n      this._abortController.abort();\n    }\n  }\n}\n\nexport {\n  PDFFetchStream,\n};\n","/* Copyright 2012 Mozilla Foundation\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *     http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { assert, createPromiseCapability, stringToBytes } from '../shared/util';\nimport {\n  createResponseStatusError, extractFilenameFromHeader,\n  validateRangeRequestCapabilities\n} from './network_utils';\nimport globalScope from '../shared/global_scope';\n\nif (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('FIREFOX || MOZCENTRAL')) {\n  throw new Error('Module \"./network\" shall not ' +\n                  'be used with FIREFOX or MOZCENTRAL build.');\n}\n\nvar OK_RESPONSE = 200;\nvar PARTIAL_CONTENT_RESPONSE = 206;\n\nfunction NetworkManager(url, args) {\n  this.url = url;\n  args = args || {};\n  this.isHttp = /^https?:/i.test(url);\n  this.httpHeaders = (this.isHttp && args.httpHeaders) || {};\n  this.withCredentials = args.withCredentials || false;\n  this.getXhr = args.getXhr ||\n    function NetworkManager_getXhr() {\n      return new XMLHttpRequest();\n    };\n\n  this.currXhrId = 0;\n  this.pendingRequests = Object.create(null);\n  this.loadedRequests = Object.create(null);\n}\n\nfunction getArrayBuffer(xhr) {\n  var data = xhr.response;\n  if (typeof data !== 'string') {\n    return data;\n  }\n  let array = stringToBytes(data);\n  return array.buffer;\n}\n\nvar supportsMozChunked =\n  typeof PDFJSDev !== 'undefined' && PDFJSDev.test('CHROME') ? false :\n    (function supportsMozChunkedClosure() {\n  try {\n    var x = new XMLHttpRequest();\n    // Firefox 37- required .open() to be called before setting responseType.\n    // https://bugzilla.mozilla.org/show_bug.cgi?id=707484\n    // Even though the URL is not visited, .open() could fail if the URL is\n    // blocked, e.g. via the connect-src CSP directive or the NoScript addon.\n    // When this error occurs, this feature detection method will mistakenly\n    // report that moz-chunked-arraybuffer is not supported in Firefox 37-.\n    x.open('GET', globalScope.location.href);\n    x.responseType = 'moz-chunked-arraybuffer';\n    return x.responseType === 'moz-chunked-arraybuffer';\n  } catch (e) {\n    return false;\n  }\n})();\n\nNetworkManager.prototype = {\n  requestRange: function NetworkManager_requestRange(begin, end, listeners) {\n    var args = {\n      begin,\n      end,\n    };\n    for (var prop in listeners) {\n      args[prop] = listeners[prop];\n    }\n    return this.request(args);\n  },\n\n  requestFull: function NetworkManager_requestFull(listeners) {\n    return this.request(listeners);\n  },\n\n  request: function NetworkManager_request(args) {\n    var xhr = this.getXhr();\n    var xhrId = this.currXhrId++;\n    var pendingRequest = this.pendingRequests[xhrId] = {\n      xhr,\n    };\n\n    xhr.open('GET', this.url);\n    xhr.withCredentials = this.withCredentials;\n    for (var property in this.httpHeaders) {\n      var value = this.httpHeaders[property];\n      if (typeof value === 'undefined') {\n        continue;\n      }\n      xhr.setRequestHeader(property, value);\n    }\n    if (this.isHttp && 'begin' in args && 'end' in args) {\n      var rangeStr = args.begin + '-' + (args.end - 1);\n      xhr.setRequestHeader('Range', 'bytes=' + rangeStr);\n      pendingRequest.expectedStatus = 206;\n    } else {\n      pendingRequest.expectedStatus = 200;\n    }\n\n    var useMozChunkedLoading = supportsMozChunked && !!args.onProgressiveData;\n    if (useMozChunkedLoading) {\n      xhr.responseType = 'moz-chunked-arraybuffer';\n      pendingRequest.onProgressiveData = args.onProgressiveData;\n      pendingRequest.mozChunked = true;\n    } else {\n      xhr.responseType = 'arraybuffer';\n    }\n\n    if (args.onError) {\n      xhr.onerror = function(evt) {\n        args.onError(xhr.status);\n      };\n    }\n    xhr.onreadystatechange = this.onStateChange.bind(this, xhrId);\n    xhr.onprogress = this.onProgress.bind(this, xhrId);\n\n    pendingRequest.onHeadersReceived = args.onHeadersReceived;\n    pendingRequest.onDone = args.onDone;\n    pendingRequest.onError = args.onError;\n    pendingRequest.onProgress = args.onProgress;\n\n    xhr.send(null);\n\n    return xhrId;\n  },\n\n  onProgress: function NetworkManager_onProgress(xhrId, evt) {\n    var pendingRequest = this.pendingRequests[xhrId];\n    if (!pendingRequest) {\n      // Maybe abortRequest was called...\n      return;\n    }\n\n    if (pendingRequest.mozChunked) {\n      var chunk = getArrayBuffer(pendingRequest.xhr);\n      pendingRequest.onProgressiveData(chunk);\n    }\n\n    var onProgress = pendingRequest.onProgress;\n    if (onProgress) {\n      onProgress(evt);\n    }\n  },\n\n  onStateChange: function NetworkManager_onStateChange(xhrId, evt) {\n    var pendingRequest = this.pendingRequests[xhrId];\n    if (!pendingRequest) {\n      // Maybe abortRequest was called...\n      return;\n    }\n\n    var xhr = pendingRequest.xhr;\n    if (xhr.readyState >= 2 && pendingRequest.onHeadersReceived) {\n      pendingRequest.onHeadersReceived();\n      delete pendingRequest.onHeadersReceived;\n    }\n\n    if (xhr.readyState !== 4) {\n      return;\n    }\n\n    if (!(xhrId in this.pendingRequests)) {\n      // The XHR request might have been aborted in onHeadersReceived()\n      // callback, in which case we should abort request\n      return;\n    }\n\n    delete this.pendingRequests[xhrId];\n\n    // success status == 0 can be on ftp, file and other protocols\n    if (xhr.status === 0 && this.isHttp) {\n      if (pendingRequest.onError) {\n        pendingRequest.onError(xhr.status);\n      }\n      return;\n    }\n    var xhrStatus = xhr.status || OK_RESPONSE;\n\n    // From http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35.2:\n    // \"A server MAY ignore the Range header\". This means it's possible to\n    // get a 200 rather than a 206 response from a range request.\n    var ok_response_on_range_request =\n        xhrStatus === OK_RESPONSE &&\n        pendingRequest.expectedStatus === PARTIAL_CONTENT_RESPONSE;\n\n    if (!ok_response_on_range_request &&\n        xhrStatus !== pendingRequest.expectedStatus) {\n      if (pendingRequest.onError) {\n        pendingRequest.onError(xhr.status);\n      }\n      return;\n    }\n\n    this.loadedRequests[xhrId] = true;\n\n    var chunk = getArrayBuffer(xhr);\n    if (xhrStatus === PARTIAL_CONTENT_RESPONSE) {\n      var rangeHeader = xhr.getResponseHeader('Content-Range');\n      var matches = /bytes (\\d+)-(\\d+)\\/(\\d+)/.exec(rangeHeader);\n      var begin = parseInt(matches[1], 10);\n      pendingRequest.onDone({\n        begin,\n        chunk,\n      });\n    } else if (pendingRequest.onProgressiveData) {\n      pendingRequest.onDone(null);\n    } else if (chunk) {\n      pendingRequest.onDone({\n        begin: 0,\n        chunk,\n      });\n    } else if (pendingRequest.onError) {\n      pendingRequest.onError(xhr.status);\n    }\n  },\n\n  hasPendingRequests: function NetworkManager_hasPendingRequests() {\n    for (var xhrId in this.pendingRequests) {\n      return true;\n    }\n    return false;\n  },\n\n  getRequestXhr: function NetworkManager_getXhr(xhrId) {\n    return this.pendingRequests[xhrId].xhr;\n  },\n\n  isStreamingRequest: function NetworkManager_isStreamingRequest(xhrId) {\n    return !!(this.pendingRequests[xhrId].onProgressiveData);\n  },\n\n  isPendingRequest: function NetworkManager_isPendingRequest(xhrId) {\n    return xhrId in this.pendingRequests;\n  },\n\n  isLoadedRequest: function NetworkManager_isLoadedRequest(xhrId) {\n    return xhrId in this.loadedRequests;\n  },\n\n  abortAllRequests: function NetworkManager_abortAllRequests() {\n    for (var xhrId in this.pendingRequests) {\n      this.abortRequest(xhrId | 0);\n    }\n  },\n\n  abortRequest: function NetworkManager_abortRequest(xhrId) {\n    var xhr = this.pendingRequests[xhrId].xhr;\n    delete this.pendingRequests[xhrId];\n    xhr.abort();\n  },\n};\n\n/** @implements {IPDFStream} */\nfunction PDFNetworkStream(source) {\n  this._source = source;\n  this._manager = new NetworkManager(source.url, {\n    httpHeaders: source.httpHeaders,\n    withCredentials: source.withCredentials,\n  });\n  this._rangeChunkSize = source.rangeChunkSize;\n  this._fullRequestReader = null;\n  this._rangeRequestReaders = [];\n}\n\nPDFNetworkStream.prototype = {\n  _onRangeRequestReaderClosed:\n      function PDFNetworkStream_onRangeRequestReaderClosed(reader) {\n    var i = this._rangeRequestReaders.indexOf(reader);\n    if (i >= 0) {\n      this._rangeRequestReaders.splice(i, 1);\n    }\n  },\n\n  getFullReader: function PDFNetworkStream_getFullReader() {\n    assert(!this._fullRequestReader);\n    this._fullRequestReader =\n      new PDFNetworkStreamFullRequestReader(this._manager, this._source);\n    return this._fullRequestReader;\n  },\n\n  getRangeReader: function PDFNetworkStream_getRangeReader(begin, end) {\n    var reader = new PDFNetworkStreamRangeRequestReader(this._manager,\n                                                        begin, end);\n    reader.onClosed = this._onRangeRequestReaderClosed.bind(this);\n    this._rangeRequestReaders.push(reader);\n    return reader;\n  },\n\n  cancelAllRequests: function PDFNetworkStream_cancelAllRequests(reason) {\n    if (this._fullRequestReader) {\n      this._fullRequestReader.cancel(reason);\n    }\n    var readers = this._rangeRequestReaders.slice(0);\n    readers.forEach(function (reader) {\n      reader.cancel(reason);\n    });\n  },\n};\n\n/** @implements {IPDFStreamReader} */\nfunction PDFNetworkStreamFullRequestReader(manager, source) {\n  this._manager = manager;\n\n  var args = {\n    onHeadersReceived: this._onHeadersReceived.bind(this),\n    onProgressiveData: source.disableStream ? null :\n                       this._onProgressiveData.bind(this),\n    onDone: this._onDone.bind(this),\n    onError: this._onError.bind(this),\n    onProgress: this._onProgress.bind(this),\n  };\n  this._url = source.url;\n  this._fullRequestId = manager.requestFull(args);\n  this._headersReceivedCapability = createPromiseCapability();\n  this._disableRange = source.disableRange || false;\n  this._contentLength = source.length; // optional\n  this._rangeChunkSize = source.rangeChunkSize;\n  if (!this._rangeChunkSize && !this._disableRange) {\n    this._disableRange = true;\n  }\n\n  this._isStreamingSupported = false;\n  this._isRangeSupported = false;\n\n  this._cachedChunks = [];\n  this._requests = [];\n  this._done = false;\n  this._storedError = undefined;\n  this._filename = null;\n\n  this.onProgress = null;\n}\n\nPDFNetworkStreamFullRequestReader.prototype = {\n  _onHeadersReceived:\n      function PDFNetworkStreamFullRequestReader_onHeadersReceived() {\n    var fullRequestXhrId = this._fullRequestId;\n    var fullRequestXhr = this._manager.getRequestXhr(fullRequestXhrId);\n\n    const getResponseHeader = (name) => {\n      return fullRequestXhr.getResponseHeader(name);\n    };\n    let { allowRangeRequests, suggestedLength, } =\n      validateRangeRequestCapabilities({\n        getResponseHeader,\n        isHttp: this._manager.isHttp,\n        rangeChunkSize: this._rangeChunkSize,\n        disableRange: this._disableRange,\n      });\n\n    if (allowRangeRequests) {\n      this._isRangeSupported = true;\n    }\n    // Setting right content length.\n    this._contentLength = suggestedLength || this._contentLength;\n\n    this._filename = extractFilenameFromHeader(getResponseHeader);\n\n    var networkManager = this._manager;\n    if (networkManager.isStreamingRequest(fullRequestXhrId)) {\n      // We can continue fetching when progressive loading is enabled,\n      // and we don't need the autoFetch feature.\n      this._isStreamingSupported = true;\n    } else if (this._isRangeSupported) {\n      // NOTE: by cancelling the full request, and then issuing range\n      // requests, there will be an issue for sites where you can only\n      // request the pdf once. However, if this is the case, then the\n      // server should not be returning that it can support range\n      // requests.\n      networkManager.abortRequest(fullRequestXhrId);\n    }\n\n    this._headersReceivedCapability.resolve();\n  },\n\n  _onProgressiveData:\n      function PDFNetworkStreamFullRequestReader_onProgressiveData(chunk) {\n    if (this._requests.length > 0) {\n      var requestCapability = this._requests.shift();\n      requestCapability.resolve({ value: chunk, done: false, });\n    } else {\n      this._cachedChunks.push(chunk);\n    }\n  },\n\n  _onDone: function PDFNetworkStreamFullRequestReader_onDone(args) {\n    if (args) {\n      this._onProgressiveData(args.chunk);\n    }\n    this._done = true;\n    if (this._cachedChunks.length > 0) {\n      return;\n    }\n    this._requests.forEach(function (requestCapability) {\n      requestCapability.resolve({ value: undefined, done: true, });\n    });\n    this._requests = [];\n  },\n\n  _onError: function PDFNetworkStreamFullRequestReader_onError(status) {\n    var url = this._url;\n    var exception = createResponseStatusError(status, url);\n    this._storedError = exception;\n    this._headersReceivedCapability.reject(exception);\n    this._requests.forEach(function (requestCapability) {\n      requestCapability.reject(exception);\n    });\n    this._requests = [];\n    this._cachedChunks = [];\n  },\n\n  _onProgress: function PDFNetworkStreamFullRequestReader_onProgress(data) {\n    if (this.onProgress) {\n      this.onProgress({\n        loaded: data.loaded,\n        total: data.lengthComputable ? data.total : this._contentLength,\n      });\n    }\n  },\n\n  get filename() {\n    return this._filename;\n  },\n\n  get isRangeSupported() {\n    return this._isRangeSupported;\n  },\n\n  get isStreamingSupported() {\n    return this._isStreamingSupported;\n  },\n\n  get contentLength() {\n    return this._contentLength;\n  },\n\n  get headersReady() {\n    return this._headersReceivedCapability.promise;\n  },\n\n  async read() {\n    if (this._storedError) {\n      throw this._storedError;\n    }\n    if (this._cachedChunks.length > 0) {\n      var chunk = this._cachedChunks.shift();\n      return { value: chunk, done: false, };\n    }\n    if (this._done) {\n      return { value: undefined, done: true, };\n    }\n    var requestCapability = createPromiseCapability();\n    this._requests.push(requestCapability);\n    return requestCapability.promise;\n  },\n\n  cancel: function PDFNetworkStreamFullRequestReader_cancel(reason) {\n    this._done = true;\n    this._headersReceivedCapability.reject(reason);\n    this._requests.forEach(function (requestCapability) {\n      requestCapability.resolve({ value: undefined, done: true, });\n    });\n    this._requests = [];\n    if (this._manager.isPendingRequest(this._fullRequestId)) {\n      this._manager.abortRequest(this._fullRequestId);\n    }\n    this._fullRequestReader = null;\n  },\n};\n\n/** @implements {IPDFStreamRangeReader} */\nfunction PDFNetworkStreamRangeRequestReader(manager, begin, end) {\n  this._manager = manager;\n  var args = {\n    onDone: this._onDone.bind(this),\n    onProgress: this._onProgress.bind(this),\n  };\n  this._requestId = manager.requestRange(begin, end, args);\n  this._requests = [];\n  this._queuedChunk = null;\n  this._done = false;\n\n  this.onProgress = null;\n  this.onClosed = null;\n}\n\nPDFNetworkStreamRangeRequestReader.prototype = {\n  _close: function PDFNetworkStreamRangeRequestReader_close() {\n    if (this.onClosed) {\n      this.onClosed(this);\n    }\n  },\n\n  _onDone: function PDFNetworkStreamRangeRequestReader_onDone(data) {\n    var chunk = data.chunk;\n    if (this._requests.length > 0) {\n      var requestCapability = this._requests.shift();\n      requestCapability.resolve({ value: chunk, done: false, });\n    } else {\n      this._queuedChunk = chunk;\n    }\n    this._done = true;\n    this._requests.forEach(function (requestCapability) {\n      requestCapability.resolve({ value: undefined, done: true, });\n    });\n    this._requests = [];\n    this._close();\n  },\n\n  _onProgress: function PDFNetworkStreamRangeRequestReader_onProgress(evt) {\n    if (!this.isStreamingSupported && this.onProgress) {\n      this.onProgress({\n        loaded: evt.loaded,\n      });\n    }\n  },\n\n  get isStreamingSupported() {\n    return false; // TODO allow progressive range bytes loading\n  },\n\n  async read() {\n    if (this._queuedChunk !== null) {\n      var chunk = this._queuedChunk;\n      this._queuedChunk = null;\n      return { value: chunk, done: false, };\n    }\n    if (this._done) {\n      return { value: undefined, done: true, };\n    }\n    var requestCapability = createPromiseCapability();\n    this._requests.push(requestCapability);\n    return requestCapability.promise;\n  },\n\n  cancel: function PDFNetworkStreamRangeRequestReader_cancel(reason) {\n    this._done = true;\n    this._requests.forEach(function (requestCapability) {\n      requestCapability.resolve({ value: undefined, done: true, });\n    });\n    this._requests = [];\n    if (this._manager.isPendingRequest(this._requestId)) {\n      this._manager.abortRequest(this._requestId);\n    }\n    this._close();\n  },\n};\n\nexport {\n  PDFNetworkStream,\n  NetworkManager,\n};\n"],"sourceRoot":""}