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c5fe657dd3
Fixes #3163 Co-authored-by: Kitson Kelly <me@kitsonkelly.com> Co-authored-by: Qwerasd <qwerasd205@users.noreply.github.com>
134 lines
4.9 KiB
TypeScript
134 lines
4.9 KiB
TypeScript
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
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// The following code is based off:
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// https://github.com/inexorabletash/text-encoding
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//
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// Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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// `.apply` can actually take a typed array, though the type system doesn't
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// really support it, so we have to "hack" it a bit to get past some of the
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// strict type checks.
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declare global {
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interface CallableFunction extends Function {
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apply<T, R>(
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this: (this: T, ...args: number[]) => R,
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thisArg: T,
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args: Uint16Array
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): R;
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}
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}
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export function decodeUtf8(
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input: Uint8Array,
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fatal: boolean,
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ignoreBOM: boolean
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): string {
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let outString = "";
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// Prepare a buffer so that we don't have to do a lot of string concats, which
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// are very slow.
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const outBufferLength: number = Math.min(1024, input.length);
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const outBuffer = new Uint16Array(outBufferLength);
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let outIndex = 0;
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let state = 0;
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let codepoint = 0;
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let type: number;
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let i =
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ignoreBOM && input[0] === 0xef && input[1] === 0xbb && input[2] === 0xbf
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? 3
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: 0;
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for (; i < input.length; ++i) {
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// Encoding error handling
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if (state === 12 || (state !== 0 && (input[i] & 0xc0) !== 0x80)) {
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if (fatal)
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throw new TypeError(
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`Decoder error. Invalid byte in sequence at position ${i} in data.`
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);
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outBuffer[outIndex++] = 0xfffd; // Replacement character
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if (outIndex === outBufferLength) {
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outString += String.fromCharCode.apply(null, outBuffer);
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outIndex = 0;
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}
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state = 0;
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}
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// prettier-ignore
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type = [
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
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8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
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10,3,3,3,3,3,3,3,3,3,3,3,3,4,3,3, 11,6,6,6,5,8,8,8,8,8,8,8,8,8,8,8
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][input[i]];
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codepoint =
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state !== 0
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? (input[i] & 0x3f) | (codepoint << 6)
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: (0xff >> type) & input[i];
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// prettier-ignore
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state = [
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0,12,24,36,60,96,84,12,12,12,48,72, 12,12,12,12,12,12,12,12,12,12,12,12,
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12, 0,12,12,12,12,12, 0,12, 0,12,12, 12,24,12,12,12,12,12,24,12,24,12,12,
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12,12,12,12,12,12,12,24,12,12,12,12, 12,24,12,12,12,12,12,12,12,24,12,12,
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12,12,12,12,12,12,12,36,12,36,12,12, 12,36,12,12,12,12,12,36,12,36,12,12,
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12,36,12,12,12,12,12,12,12,12,12,12
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][state + type];
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if (state !== 0) continue;
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// Add codepoint to buffer (as charcodes for utf-16), and flush buffer to
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// string if needed.
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if (codepoint > 0xffff) {
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outBuffer[outIndex++] = 0xd7c0 + (codepoint >> 10);
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if (outIndex === outBufferLength) {
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outString += String.fromCharCode.apply(null, outBuffer);
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outIndex = 0;
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}
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outBuffer[outIndex++] = 0xdc00 | (codepoint & 0x3ff);
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if (outIndex === outBufferLength) {
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outString += String.fromCharCode.apply(null, outBuffer);
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outIndex = 0;
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}
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} else {
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outBuffer[outIndex++] = codepoint;
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if (outIndex === outBufferLength) {
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outString += String.fromCharCode.apply(null, outBuffer);
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outIndex = 0;
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}
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}
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}
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// Add a replacement character if we ended in the middle of a sequence or
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// encountered an invalid code at the end.
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if (state !== 0) {
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if (fatal) throw new TypeError(`Decoder error. Unexpected end of data.`);
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outBuffer[outIndex++] = 0xfffd; // Replacement character
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}
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// Final flush of buffer
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outString += String.fromCharCode.apply(null, outBuffer.subarray(0, outIndex));
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return outString;
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}
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