mirror of
https://github.com/denoland/deno.git
synced 2024-12-29 10:39:10 -05:00
601 lines
16 KiB
TypeScript
601 lines
16 KiB
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
|
||
import * as hex from "../encoding/hex.ts";
|
||
import * as base64 from "../encoding/base64.ts";
|
||
import { Encodings, normalizeEncoding, notImplemented } from "./_utils.ts";
|
||
|
||
const notImplementedEncodings = [
|
||
"ascii",
|
||
"binary",
|
||
"latin1",
|
||
"ucs2",
|
||
"utf16le",
|
||
];
|
||
|
||
function checkEncoding(encoding = "utf8", strict = true): Encodings {
|
||
if (typeof encoding !== "string" || (strict && encoding === "")) {
|
||
if (!strict) return "utf8";
|
||
throw new TypeError(`Unkown encoding: ${encoding}`);
|
||
}
|
||
|
||
const normalized = normalizeEncoding(encoding);
|
||
|
||
if (normalized === undefined) {
|
||
throw new TypeError(`Unkown encoding: ${encoding}`);
|
||
}
|
||
|
||
if (notImplementedEncodings.includes(encoding)) {
|
||
notImplemented(`"${encoding}" encoding`);
|
||
}
|
||
|
||
return normalized;
|
||
}
|
||
|
||
interface EncodingOp {
|
||
byteLength(string: string): number;
|
||
}
|
||
|
||
// https://github.com/nodejs/node/blob/56dbe466fdbc598baea3bfce289bf52b97b8b8f7/lib/buffer.js#L598
|
||
const encodingOps: { [key: string]: EncodingOp } = {
|
||
utf8: {
|
||
byteLength: (string: string): number =>
|
||
new TextEncoder().encode(string).byteLength,
|
||
},
|
||
ucs2: {
|
||
byteLength: (string: string): number => string.length * 2,
|
||
},
|
||
utf16le: {
|
||
byteLength: (string: string): number => string.length * 2,
|
||
},
|
||
latin1: {
|
||
byteLength: (string: string): number => string.length,
|
||
},
|
||
ascii: {
|
||
byteLength: (string: string): number => string.length,
|
||
},
|
||
base64: {
|
||
byteLength: (string: string): number =>
|
||
base64ByteLength(string, string.length),
|
||
},
|
||
hex: {
|
||
byteLength: (string: string): number => string.length >>> 1,
|
||
},
|
||
};
|
||
|
||
function base64ByteLength(str: string, bytes: number): number {
|
||
// Handle padding
|
||
if (str.charCodeAt(bytes - 1) === 0x3d) bytes--;
|
||
if (bytes > 1 && str.charCodeAt(bytes - 1) === 0x3d) bytes--;
|
||
|
||
// Base64 ratio: 3/4
|
||
return (bytes * 3) >>> 2;
|
||
}
|
||
|
||
/**
|
||
* See also https://nodejs.org/api/buffer.html
|
||
*/
|
||
export class Buffer extends Uint8Array {
|
||
/**
|
||
* Allocates a new Buffer of size bytes.
|
||
*/
|
||
static alloc(
|
||
size: number,
|
||
fill?: number | string | Uint8Array | Buffer,
|
||
encoding = "utf8",
|
||
): Buffer {
|
||
if (typeof size !== "number") {
|
||
throw new TypeError(
|
||
`The "size" argument must be of type number. Received type ${typeof size}`,
|
||
);
|
||
}
|
||
|
||
const buf = new Buffer(size);
|
||
if (size === 0) return buf;
|
||
|
||
let bufFill;
|
||
if (typeof fill === "string") {
|
||
const clearEncoding = checkEncoding(encoding);
|
||
if (
|
||
typeof fill === "string" &&
|
||
fill.length === 1 &&
|
||
clearEncoding === "utf8"
|
||
) {
|
||
buf.fill(fill.charCodeAt(0));
|
||
} else bufFill = Buffer.from(fill, clearEncoding);
|
||
} else if (typeof fill === "number") {
|
||
buf.fill(fill);
|
||
} else if (fill instanceof Uint8Array) {
|
||
if (fill.length === 0) {
|
||
throw new TypeError(
|
||
`The argument "value" is invalid. Received ${fill.constructor.name} []`,
|
||
);
|
||
}
|
||
|
||
bufFill = fill;
|
||
}
|
||
|
||
if (bufFill) {
|
||
if (bufFill.length > buf.length) {
|
||
bufFill = bufFill.subarray(0, buf.length);
|
||
}
|
||
|
||
let offset = 0;
|
||
while (offset < size) {
|
||
buf.set(bufFill, offset);
|
||
offset += bufFill.length;
|
||
if (offset + bufFill.length >= size) break;
|
||
}
|
||
if (offset !== size) {
|
||
buf.set(bufFill.subarray(0, size - offset), offset);
|
||
}
|
||
}
|
||
|
||
return buf;
|
||
}
|
||
|
||
static allocUnsafe(size: number): Buffer {
|
||
return new Buffer(size);
|
||
}
|
||
|
||
/**
|
||
* Returns the byte length of a string when encoded. This is not the same as
|
||
* String.prototype.length, which does not account for the encoding that is
|
||
* used to convert the string into bytes.
|
||
*/
|
||
static byteLength(
|
||
string: string | Buffer | ArrayBufferView | ArrayBuffer | SharedArrayBuffer,
|
||
encoding = "utf8",
|
||
): number {
|
||
if (typeof string != "string") return string.byteLength;
|
||
|
||
encoding = normalizeEncoding(encoding) || "utf8";
|
||
return encodingOps[encoding].byteLength(string);
|
||
}
|
||
|
||
/**
|
||
* Returns a new Buffer which is the result of concatenating all the Buffer
|
||
* instances in the list together.
|
||
*/
|
||
static concat(list: Buffer[] | Uint8Array[], totalLength?: number): Buffer {
|
||
if (totalLength == undefined) {
|
||
totalLength = 0;
|
||
for (const buf of list) {
|
||
totalLength += buf.length;
|
||
}
|
||
}
|
||
|
||
const buffer = Buffer.allocUnsafe(totalLength);
|
||
let pos = 0;
|
||
for (const item of list) {
|
||
let buf: Buffer;
|
||
if (!(item instanceof Buffer)) {
|
||
buf = Buffer.from(item);
|
||
} else {
|
||
buf = item;
|
||
}
|
||
buf.copy(buffer, pos);
|
||
pos += buf.length;
|
||
}
|
||
|
||
return buffer;
|
||
}
|
||
|
||
/**
|
||
* Allocates a new Buffer using an array of bytes in the range 0 – 255. Array
|
||
* entries outside that range will be truncated to fit into it.
|
||
*/
|
||
static from(array: number[]): Buffer;
|
||
/**
|
||
* This creates a view of the ArrayBuffer without copying the underlying
|
||
* memory. For example, when passed a reference to the .buffer property of a
|
||
* TypedArray instance, the newly created Buffer will share the same allocated
|
||
* memory as the TypedArray.
|
||
*/
|
||
static from(
|
||
arrayBuffer: ArrayBuffer | SharedArrayBuffer,
|
||
byteOffset?: number,
|
||
length?: number,
|
||
): Buffer;
|
||
/**
|
||
* Copies the passed buffer data onto a new Buffer instance.
|
||
*/
|
||
static from(buffer: Buffer | Uint8Array): Buffer;
|
||
/**
|
||
* Creates a new Buffer containing string.
|
||
*/
|
||
static from(string: string, encoding?: string): Buffer;
|
||
static from(
|
||
// deno-lint-ignore no-explicit-any
|
||
value: any,
|
||
offsetOrEncoding?: number | string,
|
||
length?: number,
|
||
): Buffer {
|
||
const offset = typeof offsetOrEncoding === "string"
|
||
? undefined
|
||
: offsetOrEncoding;
|
||
let encoding = typeof offsetOrEncoding === "string"
|
||
? offsetOrEncoding
|
||
: undefined;
|
||
|
||
if (typeof value == "string") {
|
||
encoding = checkEncoding(encoding, false);
|
||
if (encoding === "hex") return new Buffer(hex.decodeString(value).buffer);
|
||
if (encoding === "base64") return new Buffer(base64.decode(value).buffer);
|
||
return new Buffer(new TextEncoder().encode(value).buffer);
|
||
}
|
||
|
||
// workaround for https://github.com/microsoft/TypeScript/issues/38446
|
||
return new Buffer(value, offset!, length);
|
||
}
|
||
|
||
/**
|
||
* Returns true if obj is a Buffer, false otherwise.
|
||
*/
|
||
static isBuffer(obj: unknown): obj is Buffer {
|
||
return obj instanceof Buffer;
|
||
}
|
||
|
||
// deno-lint-ignore no-explicit-any
|
||
static isEncoding(encoding: any): boolean {
|
||
return (
|
||
typeof encoding === "string" &&
|
||
encoding.length !== 0 &&
|
||
normalizeEncoding(encoding) !== undefined
|
||
);
|
||
}
|
||
|
||
/**
|
||
* Copies data from a region of buf to a region in target, even if the target
|
||
* memory region overlaps with buf.
|
||
*/
|
||
copy(
|
||
targetBuffer: Buffer | Uint8Array,
|
||
targetStart = 0,
|
||
sourceStart = 0,
|
||
sourceEnd = this.length,
|
||
): number {
|
||
const sourceBuffer = this
|
||
.subarray(sourceStart, sourceEnd)
|
||
.subarray(0, Math.max(0, targetBuffer.length - targetStart));
|
||
|
||
if (sourceBuffer.length === 0) return 0;
|
||
|
||
targetBuffer.set(sourceBuffer, targetStart);
|
||
return sourceBuffer.length;
|
||
}
|
||
|
||
/*
|
||
* Returns true if both buf and otherBuffer have exactly the same bytes, false otherwise.
|
||
*/
|
||
equals(otherBuffer: Uint8Array | Buffer): boolean {
|
||
if (!(otherBuffer instanceof Uint8Array)) {
|
||
throw new TypeError(
|
||
`The "otherBuffer" argument must be an instance of Buffer or Uint8Array. Received type ${typeof otherBuffer}`,
|
||
);
|
||
}
|
||
|
||
if (this === otherBuffer) return true;
|
||
if (this.byteLength !== otherBuffer.byteLength) return false;
|
||
|
||
for (let i = 0; i < this.length; i++) {
|
||
if (this[i] !== otherBuffer[i]) return false;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
readBigInt64BE(offset = 0): bigint {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength,
|
||
).getBigInt64(offset);
|
||
}
|
||
readBigInt64LE(offset = 0): bigint {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength,
|
||
).getBigInt64(offset, true);
|
||
}
|
||
|
||
readBigUInt64BE(offset = 0): bigint {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength,
|
||
).getBigUint64(offset);
|
||
}
|
||
readBigUInt64LE(offset = 0): bigint {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength,
|
||
).getBigUint64(offset, true);
|
||
}
|
||
|
||
readDoubleBE(offset = 0): number {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength,
|
||
).getFloat64(offset);
|
||
}
|
||
readDoubleLE(offset = 0): number {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength,
|
||
).getFloat64(offset, true);
|
||
}
|
||
|
||
readFloatBE(offset = 0): number {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength,
|
||
).getFloat32(offset);
|
||
}
|
||
readFloatLE(offset = 0): number {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength,
|
||
).getFloat32(offset, true);
|
||
}
|
||
|
||
readInt8(offset = 0): number {
|
||
return new DataView(this.buffer, this.byteOffset, this.byteLength).getInt8(
|
||
offset,
|
||
);
|
||
}
|
||
|
||
readInt16BE(offset = 0): number {
|
||
return new DataView(this.buffer, this.byteOffset, this.byteLength).getInt16(
|
||
offset,
|
||
);
|
||
}
|
||
readInt16LE(offset = 0): number {
|
||
return new DataView(this.buffer, this.byteOffset, this.byteLength).getInt16(
|
||
offset,
|
||
true,
|
||
);
|
||
}
|
||
|
||
readInt32BE(offset = 0): number {
|
||
return new DataView(this.buffer, this.byteOffset, this.byteLength).getInt32(
|
||
offset,
|
||
);
|
||
}
|
||
readInt32LE(offset = 0): number {
|
||
return new DataView(this.buffer, this.byteOffset, this.byteLength).getInt32(
|
||
offset,
|
||
true,
|
||
);
|
||
}
|
||
|
||
readUInt8(offset = 0): number {
|
||
return new DataView(this.buffer, this.byteOffset, this.byteLength).getUint8(
|
||
offset,
|
||
);
|
||
}
|
||
|
||
readUInt16BE(offset = 0): number {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength,
|
||
).getUint16(offset);
|
||
}
|
||
readUInt16LE(offset = 0): number {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength,
|
||
).getUint16(offset, true);
|
||
}
|
||
|
||
readUInt32BE(offset = 0): number {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength,
|
||
).getUint32(offset);
|
||
}
|
||
readUInt32LE(offset = 0): number {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength,
|
||
).getUint32(offset, true);
|
||
}
|
||
|
||
/**
|
||
* Returns a new Buffer that references the same memory as the original, but
|
||
* offset and cropped by the start and end indices.
|
||
*/
|
||
slice(begin = 0, end = this.length): Buffer {
|
||
// workaround for https://github.com/microsoft/TypeScript/issues/38665
|
||
return this.subarray(begin, end) as Buffer;
|
||
}
|
||
|
||
/**
|
||
* Returns a JSON representation of buf. JSON.stringify() implicitly calls
|
||
* this function when stringifying a Buffer instance.
|
||
*/
|
||
toJSON(): Record<string, unknown> {
|
||
return { type: "Buffer", data: Array.from(this) };
|
||
}
|
||
|
||
/**
|
||
* Decodes buf to a string according to the specified character encoding in
|
||
* encoding. start and end may be passed to decode only a subset of buf.
|
||
*/
|
||
toString(encoding = "utf8", start = 0, end = this.length): string {
|
||
encoding = checkEncoding(encoding);
|
||
|
||
const b = this.subarray(start, end);
|
||
if (encoding === "hex") return hex.encodeToString(b);
|
||
if (encoding === "base64") return base64.encode(b.buffer);
|
||
|
||
return new TextDecoder(encoding).decode(b);
|
||
}
|
||
|
||
/**
|
||
* Writes string to buf at offset according to the character encoding in
|
||
* encoding. The length parameter is the number of bytes to write. If buf did
|
||
* not contain enough space to fit the entire string, only part of string will
|
||
* be written. However, partially encoded characters will not be written.
|
||
*/
|
||
write(string: string, offset = 0, length = this.length): number {
|
||
return new TextEncoder().encodeInto(
|
||
string,
|
||
this.subarray(offset, offset + length),
|
||
).written;
|
||
}
|
||
|
||
writeBigInt64BE(value: bigint, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setBigInt64(
|
||
offset,
|
||
value,
|
||
);
|
||
return offset + 4;
|
||
}
|
||
writeBigInt64LE(value: bigint, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setBigInt64(
|
||
offset,
|
||
value,
|
||
true,
|
||
);
|
||
return offset + 4;
|
||
}
|
||
|
||
writeBigUInt64BE(value: bigint, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setBigUint64(
|
||
offset,
|
||
value,
|
||
);
|
||
return offset + 4;
|
||
}
|
||
writeBigUInt64LE(value: bigint, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setBigUint64(
|
||
offset,
|
||
value,
|
||
true,
|
||
);
|
||
return offset + 4;
|
||
}
|
||
|
||
writeDoubleBE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setFloat64(
|
||
offset,
|
||
value,
|
||
);
|
||
return offset + 8;
|
||
}
|
||
writeDoubleLE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setFloat64(
|
||
offset,
|
||
value,
|
||
true,
|
||
);
|
||
return offset + 8;
|
||
}
|
||
|
||
writeFloatBE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setFloat32(
|
||
offset,
|
||
value,
|
||
);
|
||
return offset + 4;
|
||
}
|
||
writeFloatLE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setFloat32(
|
||
offset,
|
||
value,
|
||
true,
|
||
);
|
||
return offset + 4;
|
||
}
|
||
|
||
writeInt8(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setInt8(
|
||
offset,
|
||
value,
|
||
);
|
||
return offset + 1;
|
||
}
|
||
|
||
writeInt16BE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setInt16(
|
||
offset,
|
||
value,
|
||
);
|
||
return offset + 2;
|
||
}
|
||
writeInt16LE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setInt16(
|
||
offset,
|
||
value,
|
||
true,
|
||
);
|
||
return offset + 2;
|
||
}
|
||
|
||
writeInt32BE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setUint32(
|
||
offset,
|
||
value,
|
||
);
|
||
return offset + 4;
|
||
}
|
||
writeInt32LE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setInt32(
|
||
offset,
|
||
value,
|
||
true,
|
||
);
|
||
return offset + 4;
|
||
}
|
||
|
||
writeUInt8(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setUint8(
|
||
offset,
|
||
value,
|
||
);
|
||
return offset + 1;
|
||
}
|
||
|
||
writeUInt16BE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setUint16(
|
||
offset,
|
||
value,
|
||
);
|
||
return offset + 2;
|
||
}
|
||
writeUInt16LE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setUint16(
|
||
offset,
|
||
value,
|
||
true,
|
||
);
|
||
return offset + 2;
|
||
}
|
||
|
||
writeUInt32BE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setUint32(
|
||
offset,
|
||
value,
|
||
);
|
||
return offset + 4;
|
||
}
|
||
writeUInt32LE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setUint32(
|
||
offset,
|
||
value,
|
||
true,
|
||
);
|
||
return offset + 4;
|
||
}
|
||
}
|
||
|
||
export default { Buffer };
|