mirror of
https://github.com/JasonYANG170/IOTConnect-Web.git
synced 2024-11-23 20:26:28 +00:00
2107 lines
57 KiB
JavaScript
2107 lines
57 KiB
JavaScript
/*!
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* The buffer module from node.js, for the browser.
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*
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* @author Feross Aboukhadijeh <https://feross.org>
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* @license MIT
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*/
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/* eslint-disable no-proto */
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'use strict'
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const base64 = require('base64-js')
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const ieee754 = require('ieee754')
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const customInspectSymbol =
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(typeof Symbol === 'function' && typeof Symbol['for'] === 'function') // eslint-disable-line dot-notation
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? Symbol['for']('nodejs.util.inspect.custom') // eslint-disable-line dot-notation
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: null
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exports.Buffer = Buffer
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exports.SlowBuffer = SlowBuffer
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exports.INSPECT_MAX_BYTES = 50
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const K_MAX_LENGTH = 0x7fffffff
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exports.kMaxLength = K_MAX_LENGTH
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/**
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* If `Buffer.TYPED_ARRAY_SUPPORT`:
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* === true Use Uint8Array implementation (fastest)
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* === false Print warning and recommend using `buffer` v4.x which has an Object
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* implementation (most compatible, even IE6)
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*
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* Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
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* Opera 11.6+, iOS 4.2+.
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*
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* We report that the browser does not support typed arrays if the are not subclassable
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* using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
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* (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
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* for __proto__ and has a buggy typed array implementation.
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*/
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Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport()
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if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&
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typeof console.error === 'function') {
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console.error(
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'This browser lacks typed array (Uint8Array) support which is required by ' +
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'`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'
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)
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}
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function typedArraySupport () {
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// Can typed array instances can be augmented?
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try {
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const arr = new Uint8Array(1)
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const proto = { foo: function () { return 42 } }
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Object.setPrototypeOf(proto, Uint8Array.prototype)
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Object.setPrototypeOf(arr, proto)
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return arr.foo() === 42
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} catch (e) {
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return false
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}
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}
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Object.defineProperty(Buffer.prototype, 'parent', {
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enumerable: true,
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get: function () {
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if (!Buffer.isBuffer(this)) return undefined
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return this.buffer
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}
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})
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Object.defineProperty(Buffer.prototype, 'offset', {
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enumerable: true,
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get: function () {
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if (!Buffer.isBuffer(this)) return undefined
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return this.byteOffset
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}
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})
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function createBuffer (length) {
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if (length > K_MAX_LENGTH) {
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throw new RangeError('The value "' + length + '" is invalid for option "size"')
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}
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// Return an augmented `Uint8Array` instance
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const buf = new Uint8Array(length)
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Object.setPrototypeOf(buf, Buffer.prototype)
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return buf
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}
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/**
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* The Buffer constructor returns instances of `Uint8Array` that have their
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* prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
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* `Uint8Array`, so the returned instances will have all the node `Buffer` methods
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* and the `Uint8Array` methods. Square bracket notation works as expected -- it
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* returns a single octet.
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*
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* The `Uint8Array` prototype remains unmodified.
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*/
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function Buffer (arg, encodingOrOffset, length) {
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// Common case.
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if (typeof arg === 'number') {
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if (typeof encodingOrOffset === 'string') {
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throw new TypeError(
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'The "string" argument must be of type string. Received type number'
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)
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}
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return allocUnsafe(arg)
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}
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return from(arg, encodingOrOffset, length)
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}
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Buffer.poolSize = 8192 // not used by this implementation
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function from (value, encodingOrOffset, length) {
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if (typeof value === 'string') {
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return fromString(value, encodingOrOffset)
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}
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if (ArrayBuffer.isView(value)) {
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return fromArrayView(value)
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}
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if (value == null) {
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throw new TypeError(
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'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
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'or Array-like Object. Received type ' + (typeof value)
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)
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}
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if (isInstance(value, ArrayBuffer) ||
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(value && isInstance(value.buffer, ArrayBuffer))) {
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return fromArrayBuffer(value, encodingOrOffset, length)
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}
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if (typeof SharedArrayBuffer !== 'undefined' &&
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(isInstance(value, SharedArrayBuffer) ||
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(value && isInstance(value.buffer, SharedArrayBuffer)))) {
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return fromArrayBuffer(value, encodingOrOffset, length)
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}
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if (typeof value === 'number') {
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throw new TypeError(
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'The "value" argument must not be of type number. Received type number'
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)
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}
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const valueOf = value.valueOf && value.valueOf()
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if (valueOf != null && valueOf !== value) {
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return Buffer.from(valueOf, encodingOrOffset, length)
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}
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const b = fromObject(value)
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if (b) return b
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if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&
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typeof value[Symbol.toPrimitive] === 'function') {
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return Buffer.from(value[Symbol.toPrimitive]('string'), encodingOrOffset, length)
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}
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throw new TypeError(
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'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
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'or Array-like Object. Received type ' + (typeof value)
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)
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}
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/**
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* Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
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* if value is a number.
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* Buffer.from(str[, encoding])
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* Buffer.from(array)
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* Buffer.from(buffer)
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* Buffer.from(arrayBuffer[, byteOffset[, length]])
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**/
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Buffer.from = function (value, encodingOrOffset, length) {
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return from(value, encodingOrOffset, length)
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}
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// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
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// https://github.com/feross/buffer/pull/148
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Object.setPrototypeOf(Buffer.prototype, Uint8Array.prototype)
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Object.setPrototypeOf(Buffer, Uint8Array)
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function assertSize (size) {
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if (typeof size !== 'number') {
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throw new TypeError('"size" argument must be of type number')
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} else if (size < 0) {
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throw new RangeError('The value "' + size + '" is invalid for option "size"')
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}
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}
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function alloc (size, fill, encoding) {
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assertSize(size)
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if (size <= 0) {
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return createBuffer(size)
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}
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if (fill !== undefined) {
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// Only pay attention to encoding if it's a string. This
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// prevents accidentally sending in a number that would
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// be interpreted as a start offset.
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return typeof encoding === 'string'
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? createBuffer(size).fill(fill, encoding)
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: createBuffer(size).fill(fill)
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}
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return createBuffer(size)
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}
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/**
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* Creates a new filled Buffer instance.
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* alloc(size[, fill[, encoding]])
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**/
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Buffer.alloc = function (size, fill, encoding) {
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return alloc(size, fill, encoding)
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}
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function allocUnsafe (size) {
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assertSize(size)
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return createBuffer(size < 0 ? 0 : checked(size) | 0)
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}
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/**
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* Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
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* */
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Buffer.allocUnsafe = function (size) {
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return allocUnsafe(size)
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}
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/**
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* Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
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*/
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Buffer.allocUnsafeSlow = function (size) {
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return allocUnsafe(size)
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}
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function fromString (string, encoding) {
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if (typeof encoding !== 'string' || encoding === '') {
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encoding = 'utf8'
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}
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if (!Buffer.isEncoding(encoding)) {
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throw new TypeError('Unknown encoding: ' + encoding)
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}
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const length = byteLength(string, encoding) | 0
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let buf = createBuffer(length)
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const actual = buf.write(string, encoding)
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if (actual !== length) {
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// Writing a hex string, for example, that contains invalid characters will
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// cause everything after the first invalid character to be ignored. (e.g.
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// 'abxxcd' will be treated as 'ab')
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buf = buf.slice(0, actual)
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}
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return buf
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}
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function fromArrayLike (array) {
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const length = array.length < 0 ? 0 : checked(array.length) | 0
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const buf = createBuffer(length)
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for (let i = 0; i < length; i += 1) {
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buf[i] = array[i] & 255
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}
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return buf
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}
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function fromArrayView (arrayView) {
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if (isInstance(arrayView, Uint8Array)) {
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const copy = new Uint8Array(arrayView)
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return fromArrayBuffer(copy.buffer, copy.byteOffset, copy.byteLength)
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}
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return fromArrayLike(arrayView)
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}
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function fromArrayBuffer (array, byteOffset, length) {
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if (byteOffset < 0 || array.byteLength < byteOffset) {
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throw new RangeError('"offset" is outside of buffer bounds')
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}
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if (array.byteLength < byteOffset + (length || 0)) {
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throw new RangeError('"length" is outside of buffer bounds')
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}
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let buf
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if (byteOffset === undefined && length === undefined) {
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buf = new Uint8Array(array)
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} else if (length === undefined) {
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buf = new Uint8Array(array, byteOffset)
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} else {
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buf = new Uint8Array(array, byteOffset, length)
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}
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// Return an augmented `Uint8Array` instance
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Object.setPrototypeOf(buf, Buffer.prototype)
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return buf
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}
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function fromObject (obj) {
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if (Buffer.isBuffer(obj)) {
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const len = checked(obj.length) | 0
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const buf = createBuffer(len)
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if (buf.length === 0) {
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return buf
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}
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obj.copy(buf, 0, 0, len)
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return buf
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}
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if (obj.length !== undefined) {
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if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
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return createBuffer(0)
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}
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return fromArrayLike(obj)
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}
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if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
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return fromArrayLike(obj.data)
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}
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}
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function checked (length) {
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// Note: cannot use `length < K_MAX_LENGTH` here because that fails when
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// length is NaN (which is otherwise coerced to zero.)
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if (length >= K_MAX_LENGTH) {
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throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
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'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')
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}
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return length | 0
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}
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function SlowBuffer (length) {
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if (+length != length) { // eslint-disable-line eqeqeq
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length = 0
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}
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return Buffer.alloc(+length)
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}
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Buffer.isBuffer = function isBuffer (b) {
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return b != null && b._isBuffer === true &&
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b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false
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}
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Buffer.compare = function compare (a, b) {
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if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)
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if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)
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if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
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throw new TypeError(
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'The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array'
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)
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}
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if (a === b) return 0
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let x = a.length
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let y = b.length
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for (let i = 0, len = Math.min(x, y); i < len; ++i) {
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if (a[i] !== b[i]) {
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x = a[i]
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y = b[i]
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break
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}
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}
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if (x < y) return -1
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if (y < x) return 1
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return 0
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}
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Buffer.isEncoding = function isEncoding (encoding) {
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switch (String(encoding).toLowerCase()) {
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case 'hex':
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case 'utf8':
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case 'utf-8':
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case 'ascii':
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case 'latin1':
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case 'binary':
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case 'base64':
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case 'ucs2':
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case 'ucs-2':
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case 'utf16le':
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case 'utf-16le':
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return true
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default:
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return false
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}
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}
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Buffer.concat = function concat (list, length) {
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if (!Array.isArray(list)) {
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throw new TypeError('"list" argument must be an Array of Buffers')
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}
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if (list.length === 0) {
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return Buffer.alloc(0)
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}
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let i
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if (length === undefined) {
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length = 0
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for (i = 0; i < list.length; ++i) {
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length += list[i].length
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}
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}
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const buffer = Buffer.allocUnsafe(length)
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let pos = 0
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for (i = 0; i < list.length; ++i) {
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let buf = list[i]
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if (isInstance(buf, Uint8Array)) {
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if (pos + buf.length > buffer.length) {
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if (!Buffer.isBuffer(buf)) buf = Buffer.from(buf)
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buf.copy(buffer, pos)
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} else {
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Uint8Array.prototype.set.call(
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buffer,
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buf,
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pos
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)
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}
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} else if (!Buffer.isBuffer(buf)) {
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throw new TypeError('"list" argument must be an Array of Buffers')
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} else {
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buf.copy(buffer, pos)
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}
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pos += buf.length
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}
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return buffer
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}
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function byteLength (string, encoding) {
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if (Buffer.isBuffer(string)) {
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return string.length
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}
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if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {
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return string.byteLength
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}
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if (typeof string !== 'string') {
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throw new TypeError(
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'The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' +
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'Received type ' + typeof string
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)
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}
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const len = string.length
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const mustMatch = (arguments.length > 2 && arguments[2] === true)
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if (!mustMatch && len === 0) return 0
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// Use a for loop to avoid recursion
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let loweredCase = false
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for (;;) {
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switch (encoding) {
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case 'ascii':
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case 'latin1':
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case 'binary':
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return len
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case 'utf8':
|
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case 'utf-8':
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return utf8ToBytes(string).length
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case 'ucs2':
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case 'ucs-2':
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case 'utf16le':
|
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case 'utf-16le':
|
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return len * 2
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case 'hex':
|
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return len >>> 1
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case 'base64':
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return base64ToBytes(string).length
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default:
|
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if (loweredCase) {
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return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8
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}
|
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encoding = ('' + encoding).toLowerCase()
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loweredCase = true
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}
|
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}
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}
|
|
Buffer.byteLength = byteLength
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|
|
function slowToString (encoding, start, end) {
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let loweredCase = false
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|
|
// No need to verify that "this.length <= MAX_UINT32" since it's a read-only
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// property of a typed array.
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|
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// This behaves neither like String nor Uint8Array in that we set start/end
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// to their upper/lower bounds if the value passed is out of range.
|
|
// undefined is handled specially as per ECMA-262 6th Edition,
|
|
// Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
|
|
if (start === undefined || start < 0) {
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start = 0
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}
|
|
// Return early if start > this.length. Done here to prevent potential uint32
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|
// coercion fail below.
|
|
if (start > this.length) {
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return ''
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}
|
|
|
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if (end === undefined || end > this.length) {
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end = this.length
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|
}
|
|
|
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if (end <= 0) {
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return ''
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}
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|
|
|
// Force coercion to uint32. This will also coerce falsey/NaN values to 0.
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end >>>= 0
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start >>>= 0
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|
|
if (end <= start) {
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return ''
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}
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|
|
if (!encoding) encoding = 'utf8'
|
|
|
|
while (true) {
|
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switch (encoding) {
|
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case 'hex':
|
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return hexSlice(this, start, end)
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|
|
case 'utf8':
|
|
case 'utf-8':
|
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return utf8Slice(this, start, end)
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|
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case 'ascii':
|
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return asciiSlice(this, start, end)
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|
|
case 'latin1':
|
|
case 'binary':
|
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return latin1Slice(this, start, end)
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|
|
case 'base64':
|
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return base64Slice(this, start, end)
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|
|
case 'ucs2':
|
|
case 'ucs-2':
|
|
case 'utf16le':
|
|
case 'utf-16le':
|
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return utf16leSlice(this, start, end)
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|
|
default:
|
|
if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
|
|
encoding = (encoding + '').toLowerCase()
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|
loweredCase = true
|
|
}
|
|
}
|
|
}
|
|
|
|
// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)
|
|
// to detect a Buffer instance. It's not possible to use `instanceof Buffer`
|
|
// reliably in a browserify context because there could be multiple different
|
|
// copies of the 'buffer' package in use. This method works even for Buffer
|
|
// instances that were created from another copy of the `buffer` package.
|
|
// See: https://github.com/feross/buffer/issues/154
|
|
Buffer.prototype._isBuffer = true
|
|
|
|
function swap (b, n, m) {
|
|
const i = b[n]
|
|
b[n] = b[m]
|
|
b[m] = i
|
|
}
|
|
|
|
Buffer.prototype.swap16 = function swap16 () {
|
|
const len = this.length
|
|
if (len % 2 !== 0) {
|
|
throw new RangeError('Buffer size must be a multiple of 16-bits')
|
|
}
|
|
for (let i = 0; i < len; i += 2) {
|
|
swap(this, i, i + 1)
|
|
}
|
|
return this
|
|
}
|
|
|
|
Buffer.prototype.swap32 = function swap32 () {
|
|
const len = this.length
|
|
if (len % 4 !== 0) {
|
|
throw new RangeError('Buffer size must be a multiple of 32-bits')
|
|
}
|
|
for (let i = 0; i < len; i += 4) {
|
|
swap(this, i, i + 3)
|
|
swap(this, i + 1, i + 2)
|
|
}
|
|
return this
|
|
}
|
|
|
|
Buffer.prototype.swap64 = function swap64 () {
|
|
const len = this.length
|
|
if (len % 8 !== 0) {
|
|
throw new RangeError('Buffer size must be a multiple of 64-bits')
|
|
}
|
|
for (let i = 0; i < len; i += 8) {
|
|
swap(this, i, i + 7)
|
|
swap(this, i + 1, i + 6)
|
|
swap(this, i + 2, i + 5)
|
|
swap(this, i + 3, i + 4)
|
|
}
|
|
return this
|
|
}
|
|
|
|
Buffer.prototype.toString = function toString () {
|
|
const length = this.length
|
|
if (length === 0) return ''
|
|
if (arguments.length === 0) return utf8Slice(this, 0, length)
|
|
return slowToString.apply(this, arguments)
|
|
}
|
|
|
|
Buffer.prototype.toLocaleString = Buffer.prototype.toString
|
|
|
|
Buffer.prototype.equals = function equals (b) {
|
|
if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
|
|
if (this === b) return true
|
|
return Buffer.compare(this, b) === 0
|
|
}
|
|
|
|
Buffer.prototype.inspect = function inspect () {
|
|
let str = ''
|
|
const max = exports.INSPECT_MAX_BYTES
|
|
str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()
|
|
if (this.length > max) str += ' ... '
|
|
return '<Buffer ' + str + '>'
|
|
}
|
|
if (customInspectSymbol) {
|
|
Buffer.prototype[customInspectSymbol] = Buffer.prototype.inspect
|
|
}
|
|
|
|
Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
|
|
if (isInstance(target, Uint8Array)) {
|
|
target = Buffer.from(target, target.offset, target.byteLength)
|
|
}
|
|
if (!Buffer.isBuffer(target)) {
|
|
throw new TypeError(
|
|
'The "target" argument must be one of type Buffer or Uint8Array. ' +
|
|
'Received type ' + (typeof target)
|
|
)
|
|
}
|
|
|
|
if (start === undefined) {
|
|
start = 0
|
|
}
|
|
if (end === undefined) {
|
|
end = target ? target.length : 0
|
|
}
|
|
if (thisStart === undefined) {
|
|
thisStart = 0
|
|
}
|
|
if (thisEnd === undefined) {
|
|
thisEnd = this.length
|
|
}
|
|
|
|
if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
|
|
throw new RangeError('out of range index')
|
|
}
|
|
|
|
if (thisStart >= thisEnd && start >= end) {
|
|
return 0
|
|
}
|
|
if (thisStart >= thisEnd) {
|
|
return -1
|
|
}
|
|
if (start >= end) {
|
|
return 1
|
|
}
|
|
|
|
start >>>= 0
|
|
end >>>= 0
|
|
thisStart >>>= 0
|
|
thisEnd >>>= 0
|
|
|
|
if (this === target) return 0
|
|
|
|
let x = thisEnd - thisStart
|
|
let y = end - start
|
|
const len = Math.min(x, y)
|
|
|
|
const thisCopy = this.slice(thisStart, thisEnd)
|
|
const targetCopy = target.slice(start, end)
|
|
|
|
for (let i = 0; i < len; ++i) {
|
|
if (thisCopy[i] !== targetCopy[i]) {
|
|
x = thisCopy[i]
|
|
y = targetCopy[i]
|
|
break
|
|
}
|
|
}
|
|
|
|
if (x < y) return -1
|
|
if (y < x) return 1
|
|
return 0
|
|
}
|
|
|
|
// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
|
|
// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
|
|
//
|
|
// Arguments:
|
|
// - buffer - a Buffer to search
|
|
// - val - a string, Buffer, or number
|
|
// - byteOffset - an index into `buffer`; will be clamped to an int32
|
|
// - encoding - an optional encoding, relevant is val is a string
|
|
// - dir - true for indexOf, false for lastIndexOf
|
|
function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
|
|
// Empty buffer means no match
|
|
if (buffer.length === 0) return -1
|
|
|
|
// Normalize byteOffset
|
|
if (typeof byteOffset === 'string') {
|
|
encoding = byteOffset
|
|
byteOffset = 0
|
|
} else if (byteOffset > 0x7fffffff) {
|
|
byteOffset = 0x7fffffff
|
|
} else if (byteOffset < -0x80000000) {
|
|
byteOffset = -0x80000000
|
|
}
|
|
byteOffset = +byteOffset // Coerce to Number.
|
|
if (numberIsNaN(byteOffset)) {
|
|
// byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
|
|
byteOffset = dir ? 0 : (buffer.length - 1)
|
|
}
|
|
|
|
// Normalize byteOffset: negative offsets start from the end of the buffer
|
|
if (byteOffset < 0) byteOffset = buffer.length + byteOffset
|
|
if (byteOffset >= buffer.length) {
|
|
if (dir) return -1
|
|
else byteOffset = buffer.length - 1
|
|
} else if (byteOffset < 0) {
|
|
if (dir) byteOffset = 0
|
|
else return -1
|
|
}
|
|
|
|
// Normalize val
|
|
if (typeof val === 'string') {
|
|
val = Buffer.from(val, encoding)
|
|
}
|
|
|
|
// Finally, search either indexOf (if dir is true) or lastIndexOf
|
|
if (Buffer.isBuffer(val)) {
|
|
// Special case: looking for empty string/buffer always fails
|
|
if (val.length === 0) {
|
|
return -1
|
|
}
|
|
return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
|
|
} else if (typeof val === 'number') {
|
|
val = val & 0xFF // Search for a byte value [0-255]
|
|
if (typeof Uint8Array.prototype.indexOf === 'function') {
|
|
if (dir) {
|
|
return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
|
|
} else {
|
|
return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
|
|
}
|
|
}
|
|
return arrayIndexOf(buffer, [val], byteOffset, encoding, dir)
|
|
}
|
|
|
|
throw new TypeError('val must be string, number or Buffer')
|
|
}
|
|
|
|
function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
|
|
let indexSize = 1
|
|
let arrLength = arr.length
|
|
let valLength = val.length
|
|
|
|
if (encoding !== undefined) {
|
|
encoding = String(encoding).toLowerCase()
|
|
if (encoding === 'ucs2' || encoding === 'ucs-2' ||
|
|
encoding === 'utf16le' || encoding === 'utf-16le') {
|
|
if (arr.length < 2 || val.length < 2) {
|
|
return -1
|
|
}
|
|
indexSize = 2
|
|
arrLength /= 2
|
|
valLength /= 2
|
|
byteOffset /= 2
|
|
}
|
|
}
|
|
|
|
function read (buf, i) {
|
|
if (indexSize === 1) {
|
|
return buf[i]
|
|
} else {
|
|
return buf.readUInt16BE(i * indexSize)
|
|
}
|
|
}
|
|
|
|
let i
|
|
if (dir) {
|
|
let foundIndex = -1
|
|
for (i = byteOffset; i < arrLength; i++) {
|
|
if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
|
|
if (foundIndex === -1) foundIndex = i
|
|
if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
|
|
} else {
|
|
if (foundIndex !== -1) i -= i - foundIndex
|
|
foundIndex = -1
|
|
}
|
|
}
|
|
} else {
|
|
if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
|
|
for (i = byteOffset; i >= 0; i--) {
|
|
let found = true
|
|
for (let j = 0; j < valLength; j++) {
|
|
if (read(arr, i + j) !== read(val, j)) {
|
|
found = false
|
|
break
|
|
}
|
|
}
|
|
if (found) return i
|
|
}
|
|
}
|
|
|
|
return -1
|
|
}
|
|
|
|
Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
|
|
return this.indexOf(val, byteOffset, encoding) !== -1
|
|
}
|
|
|
|
Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
|
|
return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
|
|
}
|
|
|
|
Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
|
|
return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
|
|
}
|
|
|
|
function hexWrite (buf, string, offset, length) {
|
|
offset = Number(offset) || 0
|
|
const remaining = buf.length - offset
|
|
if (!length) {
|
|
length = remaining
|
|
} else {
|
|
length = Number(length)
|
|
if (length > remaining) {
|
|
length = remaining
|
|
}
|
|
}
|
|
|
|
const strLen = string.length
|
|
|
|
if (length > strLen / 2) {
|
|
length = strLen / 2
|
|
}
|
|
let i
|
|
for (i = 0; i < length; ++i) {
|
|
const parsed = parseInt(string.substr(i * 2, 2), 16)
|
|
if (numberIsNaN(parsed)) return i
|
|
buf[offset + i] = parsed
|
|
}
|
|
return i
|
|
}
|
|
|
|
function utf8Write (buf, string, offset, length) {
|
|
return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
|
|
}
|
|
|
|
function asciiWrite (buf, string, offset, length) {
|
|
return blitBuffer(asciiToBytes(string), buf, offset, length)
|
|
}
|
|
|
|
function base64Write (buf, string, offset, length) {
|
|
return blitBuffer(base64ToBytes(string), buf, offset, length)
|
|
}
|
|
|
|
function ucs2Write (buf, string, offset, length) {
|
|
return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
|
|
}
|
|
|
|
Buffer.prototype.write = function write (string, offset, length, encoding) {
|
|
// Buffer#write(string)
|
|
if (offset === undefined) {
|
|
encoding = 'utf8'
|
|
length = this.length
|
|
offset = 0
|
|
// Buffer#write(string, encoding)
|
|
} else if (length === undefined && typeof offset === 'string') {
|
|
encoding = offset
|
|
length = this.length
|
|
offset = 0
|
|
// Buffer#write(string, offset[, length][, encoding])
|
|
} else if (isFinite(offset)) {
|
|
offset = offset >>> 0
|
|
if (isFinite(length)) {
|
|
length = length >>> 0
|
|
if (encoding === undefined) encoding = 'utf8'
|
|
} else {
|
|
encoding = length
|
|
length = undefined
|
|
}
|
|
} else {
|
|
throw new Error(
|
|
'Buffer.write(string, encoding, offset[, length]) is no longer supported'
|
|
)
|
|
}
|
|
|
|
const remaining = this.length - offset
|
|
if (length === undefined || length > remaining) length = remaining
|
|
|
|
if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
|
|
throw new RangeError('Attempt to write outside buffer bounds')
|
|
}
|
|
|
|
if (!encoding) encoding = 'utf8'
|
|
|
|
let loweredCase = false
|
|
for (;;) {
|
|
switch (encoding) {
|
|
case 'hex':
|
|
return hexWrite(this, string, offset, length)
|
|
|
|
case 'utf8':
|
|
case 'utf-8':
|
|
return utf8Write(this, string, offset, length)
|
|
|
|
case 'ascii':
|
|
case 'latin1':
|
|
case 'binary':
|
|
return asciiWrite(this, string, offset, length)
|
|
|
|
case 'base64':
|
|
// Warning: maxLength not taken into account in base64Write
|
|
return base64Write(this, string, offset, length)
|
|
|
|
case 'ucs2':
|
|
case 'ucs-2':
|
|
case 'utf16le':
|
|
case 'utf-16le':
|
|
return ucs2Write(this, string, offset, length)
|
|
|
|
default:
|
|
if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
|
|
encoding = ('' + encoding).toLowerCase()
|
|
loweredCase = true
|
|
}
|
|
}
|
|
}
|
|
|
|
Buffer.prototype.toJSON = function toJSON () {
|
|
return {
|
|
type: 'Buffer',
|
|
data: Array.prototype.slice.call(this._arr || this, 0)
|
|
}
|
|
}
|
|
|
|
function base64Slice (buf, start, end) {
|
|
if (start === 0 && end === buf.length) {
|
|
return base64.fromByteArray(buf)
|
|
} else {
|
|
return base64.fromByteArray(buf.slice(start, end))
|
|
}
|
|
}
|
|
|
|
function utf8Slice (buf, start, end) {
|
|
end = Math.min(buf.length, end)
|
|
const res = []
|
|
|
|
let i = start
|
|
while (i < end) {
|
|
const firstByte = buf[i]
|
|
let codePoint = null
|
|
let bytesPerSequence = (firstByte > 0xEF)
|
|
? 4
|
|
: (firstByte > 0xDF)
|
|
? 3
|
|
: (firstByte > 0xBF)
|
|
? 2
|
|
: 1
|
|
|
|
if (i + bytesPerSequence <= end) {
|
|
let secondByte, thirdByte, fourthByte, tempCodePoint
|
|
|
|
switch (bytesPerSequence) {
|
|
case 1:
|
|
if (firstByte < 0x80) {
|
|
codePoint = firstByte
|
|
}
|
|
break
|
|
case 2:
|
|
secondByte = buf[i + 1]
|
|
if ((secondByte & 0xC0) === 0x80) {
|
|
tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
|
|
if (tempCodePoint > 0x7F) {
|
|
codePoint = tempCodePoint
|
|
}
|
|
}
|
|
break
|
|
case 3:
|
|
secondByte = buf[i + 1]
|
|
thirdByte = buf[i + 2]
|
|
if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
|
|
tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
|
|
if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
|
|
codePoint = tempCodePoint
|
|
}
|
|
}
|
|
break
|
|
case 4:
|
|
secondByte = buf[i + 1]
|
|
thirdByte = buf[i + 2]
|
|
fourthByte = buf[i + 3]
|
|
if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
|
|
tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
|
|
if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
|
|
codePoint = tempCodePoint
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (codePoint === null) {
|
|
// we did not generate a valid codePoint so insert a
|
|
// replacement char (U+FFFD) and advance only 1 byte
|
|
codePoint = 0xFFFD
|
|
bytesPerSequence = 1
|
|
} else if (codePoint > 0xFFFF) {
|
|
// encode to utf16 (surrogate pair dance)
|
|
codePoint -= 0x10000
|
|
res.push(codePoint >>> 10 & 0x3FF | 0xD800)
|
|
codePoint = 0xDC00 | codePoint & 0x3FF
|
|
}
|
|
|
|
res.push(codePoint)
|
|
i += bytesPerSequence
|
|
}
|
|
|
|
return decodeCodePointsArray(res)
|
|
}
|
|
|
|
// Based on http://stackoverflow.com/a/22747272/680742, the browser with
|
|
// the lowest limit is Chrome, with 0x10000 args.
|
|
// We go 1 magnitude less, for safety
|
|
const MAX_ARGUMENTS_LENGTH = 0x1000
|
|
|
|
function decodeCodePointsArray (codePoints) {
|
|
const len = codePoints.length
|
|
if (len <= MAX_ARGUMENTS_LENGTH) {
|
|
return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
|
|
}
|
|
|
|
// Decode in chunks to avoid "call stack size exceeded".
|
|
let res = ''
|
|
let i = 0
|
|
while (i < len) {
|
|
res += String.fromCharCode.apply(
|
|
String,
|
|
codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
|
|
)
|
|
}
|
|
return res
|
|
}
|
|
|
|
function asciiSlice (buf, start, end) {
|
|
let ret = ''
|
|
end = Math.min(buf.length, end)
|
|
|
|
for (let i = start; i < end; ++i) {
|
|
ret += String.fromCharCode(buf[i] & 0x7F)
|
|
}
|
|
return ret
|
|
}
|
|
|
|
function latin1Slice (buf, start, end) {
|
|
let ret = ''
|
|
end = Math.min(buf.length, end)
|
|
|
|
for (let i = start; i < end; ++i) {
|
|
ret += String.fromCharCode(buf[i])
|
|
}
|
|
return ret
|
|
}
|
|
|
|
function hexSlice (buf, start, end) {
|
|
const len = buf.length
|
|
|
|
if (!start || start < 0) start = 0
|
|
if (!end || end < 0 || end > len) end = len
|
|
|
|
let out = ''
|
|
for (let i = start; i < end; ++i) {
|
|
out += hexSliceLookupTable[buf[i]]
|
|
}
|
|
return out
|
|
}
|
|
|
|
function utf16leSlice (buf, start, end) {
|
|
const bytes = buf.slice(start, end)
|
|
let res = ''
|
|
// If bytes.length is odd, the last 8 bits must be ignored (same as node.js)
|
|
for (let i = 0; i < bytes.length - 1; i += 2) {
|
|
res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))
|
|
}
|
|
return res
|
|
}
|
|
|
|
Buffer.prototype.slice = function slice (start, end) {
|
|
const len = this.length
|
|
start = ~~start
|
|
end = end === undefined ? len : ~~end
|
|
|
|
if (start < 0) {
|
|
start += len
|
|
if (start < 0) start = 0
|
|
} else if (start > len) {
|
|
start = len
|
|
}
|
|
|
|
if (end < 0) {
|
|
end += len
|
|
if (end < 0) end = 0
|
|
} else if (end > len) {
|
|
end = len
|
|
}
|
|
|
|
if (end < start) end = start
|
|
|
|
const newBuf = this.subarray(start, end)
|
|
// Return an augmented `Uint8Array` instance
|
|
Object.setPrototypeOf(newBuf, Buffer.prototype)
|
|
|
|
return newBuf
|
|
}
|
|
|
|
/*
|
|
* Need to make sure that buffer isn't trying to write out of bounds.
|
|
*/
|
|
function checkOffset (offset, ext, length) {
|
|
if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
|
|
if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
|
|
}
|
|
|
|
Buffer.prototype.readUintLE =
|
|
Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
|
|
offset = offset >>> 0
|
|
byteLength = byteLength >>> 0
|
|
if (!noAssert) checkOffset(offset, byteLength, this.length)
|
|
|
|
let val = this[offset]
|
|
let mul = 1
|
|
let i = 0
|
|
while (++i < byteLength && (mul *= 0x100)) {
|
|
val += this[offset + i] * mul
|
|
}
|
|
|
|
return val
|
|
}
|
|
|
|
Buffer.prototype.readUintBE =
|
|
Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
|
|
offset = offset >>> 0
|
|
byteLength = byteLength >>> 0
|
|
if (!noAssert) {
|
|
checkOffset(offset, byteLength, this.length)
|
|
}
|
|
|
|
let val = this[offset + --byteLength]
|
|
let mul = 1
|
|
while (byteLength > 0 && (mul *= 0x100)) {
|
|
val += this[offset + --byteLength] * mul
|
|
}
|
|
|
|
return val
|
|
}
|
|
|
|
Buffer.prototype.readUint8 =
|
|
Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkOffset(offset, 1, this.length)
|
|
return this[offset]
|
|
}
|
|
|
|
Buffer.prototype.readUint16LE =
|
|
Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkOffset(offset, 2, this.length)
|
|
return this[offset] | (this[offset + 1] << 8)
|
|
}
|
|
|
|
Buffer.prototype.readUint16BE =
|
|
Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkOffset(offset, 2, this.length)
|
|
return (this[offset] << 8) | this[offset + 1]
|
|
}
|
|
|
|
Buffer.prototype.readUint32LE =
|
|
Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkOffset(offset, 4, this.length)
|
|
|
|
return ((this[offset]) |
|
|
(this[offset + 1] << 8) |
|
|
(this[offset + 2] << 16)) +
|
|
(this[offset + 3] * 0x1000000)
|
|
}
|
|
|
|
Buffer.prototype.readUint32BE =
|
|
Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkOffset(offset, 4, this.length)
|
|
|
|
return (this[offset] * 0x1000000) +
|
|
((this[offset + 1] << 16) |
|
|
(this[offset + 2] << 8) |
|
|
this[offset + 3])
|
|
}
|
|
|
|
Buffer.prototype.readBigUInt64LE = defineBigIntMethod(function readBigUInt64LE (offset) {
|
|
offset = offset >>> 0
|
|
validateNumber(offset, 'offset')
|
|
const first = this[offset]
|
|
const last = this[offset + 7]
|
|
if (first === undefined || last === undefined) {
|
|
boundsError(offset, this.length - 8)
|
|
}
|
|
|
|
const lo = first +
|
|
this[++offset] * 2 ** 8 +
|
|
this[++offset] * 2 ** 16 +
|
|
this[++offset] * 2 ** 24
|
|
|
|
const hi = this[++offset] +
|
|
this[++offset] * 2 ** 8 +
|
|
this[++offset] * 2 ** 16 +
|
|
last * 2 ** 24
|
|
|
|
return BigInt(lo) + (BigInt(hi) << BigInt(32))
|
|
})
|
|
|
|
Buffer.prototype.readBigUInt64BE = defineBigIntMethod(function readBigUInt64BE (offset) {
|
|
offset = offset >>> 0
|
|
validateNumber(offset, 'offset')
|
|
const first = this[offset]
|
|
const last = this[offset + 7]
|
|
if (first === undefined || last === undefined) {
|
|
boundsError(offset, this.length - 8)
|
|
}
|
|
|
|
const hi = first * 2 ** 24 +
|
|
this[++offset] * 2 ** 16 +
|
|
this[++offset] * 2 ** 8 +
|
|
this[++offset]
|
|
|
|
const lo = this[++offset] * 2 ** 24 +
|
|
this[++offset] * 2 ** 16 +
|
|
this[++offset] * 2 ** 8 +
|
|
last
|
|
|
|
return (BigInt(hi) << BigInt(32)) + BigInt(lo)
|
|
})
|
|
|
|
Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
|
|
offset = offset >>> 0
|
|
byteLength = byteLength >>> 0
|
|
if (!noAssert) checkOffset(offset, byteLength, this.length)
|
|
|
|
let val = this[offset]
|
|
let mul = 1
|
|
let i = 0
|
|
while (++i < byteLength && (mul *= 0x100)) {
|
|
val += this[offset + i] * mul
|
|
}
|
|
mul *= 0x80
|
|
|
|
if (val >= mul) val -= Math.pow(2, 8 * byteLength)
|
|
|
|
return val
|
|
}
|
|
|
|
Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
|
|
offset = offset >>> 0
|
|
byteLength = byteLength >>> 0
|
|
if (!noAssert) checkOffset(offset, byteLength, this.length)
|
|
|
|
let i = byteLength
|
|
let mul = 1
|
|
let val = this[offset + --i]
|
|
while (i > 0 && (mul *= 0x100)) {
|
|
val += this[offset + --i] * mul
|
|
}
|
|
mul *= 0x80
|
|
|
|
if (val >= mul) val -= Math.pow(2, 8 * byteLength)
|
|
|
|
return val
|
|
}
|
|
|
|
Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkOffset(offset, 1, this.length)
|
|
if (!(this[offset] & 0x80)) return (this[offset])
|
|
return ((0xff - this[offset] + 1) * -1)
|
|
}
|
|
|
|
Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkOffset(offset, 2, this.length)
|
|
const val = this[offset] | (this[offset + 1] << 8)
|
|
return (val & 0x8000) ? val | 0xFFFF0000 : val
|
|
}
|
|
|
|
Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkOffset(offset, 2, this.length)
|
|
const val = this[offset + 1] | (this[offset] << 8)
|
|
return (val & 0x8000) ? val | 0xFFFF0000 : val
|
|
}
|
|
|
|
Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkOffset(offset, 4, this.length)
|
|
|
|
return (this[offset]) |
|
|
(this[offset + 1] << 8) |
|
|
(this[offset + 2] << 16) |
|
|
(this[offset + 3] << 24)
|
|
}
|
|
|
|
Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkOffset(offset, 4, this.length)
|
|
|
|
return (this[offset] << 24) |
|
|
(this[offset + 1] << 16) |
|
|
(this[offset + 2] << 8) |
|
|
(this[offset + 3])
|
|
}
|
|
|
|
Buffer.prototype.readBigInt64LE = defineBigIntMethod(function readBigInt64LE (offset) {
|
|
offset = offset >>> 0
|
|
validateNumber(offset, 'offset')
|
|
const first = this[offset]
|
|
const last = this[offset + 7]
|
|
if (first === undefined || last === undefined) {
|
|
boundsError(offset, this.length - 8)
|
|
}
|
|
|
|
const val = this[offset + 4] +
|
|
this[offset + 5] * 2 ** 8 +
|
|
this[offset + 6] * 2 ** 16 +
|
|
(last << 24) // Overflow
|
|
|
|
return (BigInt(val) << BigInt(32)) +
|
|
BigInt(first +
|
|
this[++offset] * 2 ** 8 +
|
|
this[++offset] * 2 ** 16 +
|
|
this[++offset] * 2 ** 24)
|
|
})
|
|
|
|
Buffer.prototype.readBigInt64BE = defineBigIntMethod(function readBigInt64BE (offset) {
|
|
offset = offset >>> 0
|
|
validateNumber(offset, 'offset')
|
|
const first = this[offset]
|
|
const last = this[offset + 7]
|
|
if (first === undefined || last === undefined) {
|
|
boundsError(offset, this.length - 8)
|
|
}
|
|
|
|
const val = (first << 24) + // Overflow
|
|
this[++offset] * 2 ** 16 +
|
|
this[++offset] * 2 ** 8 +
|
|
this[++offset]
|
|
|
|
return (BigInt(val) << BigInt(32)) +
|
|
BigInt(this[++offset] * 2 ** 24 +
|
|
this[++offset] * 2 ** 16 +
|
|
this[++offset] * 2 ** 8 +
|
|
last)
|
|
})
|
|
|
|
Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkOffset(offset, 4, this.length)
|
|
return ieee754.read(this, offset, true, 23, 4)
|
|
}
|
|
|
|
Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkOffset(offset, 4, this.length)
|
|
return ieee754.read(this, offset, false, 23, 4)
|
|
}
|
|
|
|
Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkOffset(offset, 8, this.length)
|
|
return ieee754.read(this, offset, true, 52, 8)
|
|
}
|
|
|
|
Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkOffset(offset, 8, this.length)
|
|
return ieee754.read(this, offset, false, 52, 8)
|
|
}
|
|
|
|
function checkInt (buf, value, offset, ext, max, min) {
|
|
if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
|
|
if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
|
|
if (offset + ext > buf.length) throw new RangeError('Index out of range')
|
|
}
|
|
|
|
Buffer.prototype.writeUintLE =
|
|
Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
|
|
value = +value
|
|
offset = offset >>> 0
|
|
byteLength = byteLength >>> 0
|
|
if (!noAssert) {
|
|
const maxBytes = Math.pow(2, 8 * byteLength) - 1
|
|
checkInt(this, value, offset, byteLength, maxBytes, 0)
|
|
}
|
|
|
|
let mul = 1
|
|
let i = 0
|
|
this[offset] = value & 0xFF
|
|
while (++i < byteLength && (mul *= 0x100)) {
|
|
this[offset + i] = (value / mul) & 0xFF
|
|
}
|
|
|
|
return offset + byteLength
|
|
}
|
|
|
|
Buffer.prototype.writeUintBE =
|
|
Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
|
|
value = +value
|
|
offset = offset >>> 0
|
|
byteLength = byteLength >>> 0
|
|
if (!noAssert) {
|
|
const maxBytes = Math.pow(2, 8 * byteLength) - 1
|
|
checkInt(this, value, offset, byteLength, maxBytes, 0)
|
|
}
|
|
|
|
let i = byteLength - 1
|
|
let mul = 1
|
|
this[offset + i] = value & 0xFF
|
|
while (--i >= 0 && (mul *= 0x100)) {
|
|
this[offset + i] = (value / mul) & 0xFF
|
|
}
|
|
|
|
return offset + byteLength
|
|
}
|
|
|
|
Buffer.prototype.writeUint8 =
|
|
Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
|
|
value = +value
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
|
|
this[offset] = (value & 0xff)
|
|
return offset + 1
|
|
}
|
|
|
|
Buffer.prototype.writeUint16LE =
|
|
Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
|
|
value = +value
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
|
|
this[offset] = (value & 0xff)
|
|
this[offset + 1] = (value >>> 8)
|
|
return offset + 2
|
|
}
|
|
|
|
Buffer.prototype.writeUint16BE =
|
|
Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
|
|
value = +value
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
|
|
this[offset] = (value >>> 8)
|
|
this[offset + 1] = (value & 0xff)
|
|
return offset + 2
|
|
}
|
|
|
|
Buffer.prototype.writeUint32LE =
|
|
Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
|
|
value = +value
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
|
|
this[offset + 3] = (value >>> 24)
|
|
this[offset + 2] = (value >>> 16)
|
|
this[offset + 1] = (value >>> 8)
|
|
this[offset] = (value & 0xff)
|
|
return offset + 4
|
|
}
|
|
|
|
Buffer.prototype.writeUint32BE =
|
|
Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
|
|
value = +value
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
|
|
this[offset] = (value >>> 24)
|
|
this[offset + 1] = (value >>> 16)
|
|
this[offset + 2] = (value >>> 8)
|
|
this[offset + 3] = (value & 0xff)
|
|
return offset + 4
|
|
}
|
|
|
|
function wrtBigUInt64LE (buf, value, offset, min, max) {
|
|
checkIntBI(value, min, max, buf, offset, 7)
|
|
|
|
let lo = Number(value & BigInt(0xffffffff))
|
|
buf[offset++] = lo
|
|
lo = lo >> 8
|
|
buf[offset++] = lo
|
|
lo = lo >> 8
|
|
buf[offset++] = lo
|
|
lo = lo >> 8
|
|
buf[offset++] = lo
|
|
let hi = Number(value >> BigInt(32) & BigInt(0xffffffff))
|
|
buf[offset++] = hi
|
|
hi = hi >> 8
|
|
buf[offset++] = hi
|
|
hi = hi >> 8
|
|
buf[offset++] = hi
|
|
hi = hi >> 8
|
|
buf[offset++] = hi
|
|
return offset
|
|
}
|
|
|
|
function wrtBigUInt64BE (buf, value, offset, min, max) {
|
|
checkIntBI(value, min, max, buf, offset, 7)
|
|
|
|
let lo = Number(value & BigInt(0xffffffff))
|
|
buf[offset + 7] = lo
|
|
lo = lo >> 8
|
|
buf[offset + 6] = lo
|
|
lo = lo >> 8
|
|
buf[offset + 5] = lo
|
|
lo = lo >> 8
|
|
buf[offset + 4] = lo
|
|
let hi = Number(value >> BigInt(32) & BigInt(0xffffffff))
|
|
buf[offset + 3] = hi
|
|
hi = hi >> 8
|
|
buf[offset + 2] = hi
|
|
hi = hi >> 8
|
|
buf[offset + 1] = hi
|
|
hi = hi >> 8
|
|
buf[offset] = hi
|
|
return offset + 8
|
|
}
|
|
|
|
Buffer.prototype.writeBigUInt64LE = defineBigIntMethod(function writeBigUInt64LE (value, offset = 0) {
|
|
return wrtBigUInt64LE(this, value, offset, BigInt(0), BigInt('0xffffffffffffffff'))
|
|
})
|
|
|
|
Buffer.prototype.writeBigUInt64BE = defineBigIntMethod(function writeBigUInt64BE (value, offset = 0) {
|
|
return wrtBigUInt64BE(this, value, offset, BigInt(0), BigInt('0xffffffffffffffff'))
|
|
})
|
|
|
|
Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
|
|
value = +value
|
|
offset = offset >>> 0
|
|
if (!noAssert) {
|
|
const limit = Math.pow(2, (8 * byteLength) - 1)
|
|
|
|
checkInt(this, value, offset, byteLength, limit - 1, -limit)
|
|
}
|
|
|
|
let i = 0
|
|
let mul = 1
|
|
let sub = 0
|
|
this[offset] = value & 0xFF
|
|
while (++i < byteLength && (mul *= 0x100)) {
|
|
if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
|
|
sub = 1
|
|
}
|
|
this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
|
|
}
|
|
|
|
return offset + byteLength
|
|
}
|
|
|
|
Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
|
|
value = +value
|
|
offset = offset >>> 0
|
|
if (!noAssert) {
|
|
const limit = Math.pow(2, (8 * byteLength) - 1)
|
|
|
|
checkInt(this, value, offset, byteLength, limit - 1, -limit)
|
|
}
|
|
|
|
let i = byteLength - 1
|
|
let mul = 1
|
|
let sub = 0
|
|
this[offset + i] = value & 0xFF
|
|
while (--i >= 0 && (mul *= 0x100)) {
|
|
if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
|
|
sub = 1
|
|
}
|
|
this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
|
|
}
|
|
|
|
return offset + byteLength
|
|
}
|
|
|
|
Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
|
|
value = +value
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
|
|
if (value < 0) value = 0xff + value + 1
|
|
this[offset] = (value & 0xff)
|
|
return offset + 1
|
|
}
|
|
|
|
Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
|
|
value = +value
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
|
|
this[offset] = (value & 0xff)
|
|
this[offset + 1] = (value >>> 8)
|
|
return offset + 2
|
|
}
|
|
|
|
Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
|
|
value = +value
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
|
|
this[offset] = (value >>> 8)
|
|
this[offset + 1] = (value & 0xff)
|
|
return offset + 2
|
|
}
|
|
|
|
Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
|
|
value = +value
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
|
|
this[offset] = (value & 0xff)
|
|
this[offset + 1] = (value >>> 8)
|
|
this[offset + 2] = (value >>> 16)
|
|
this[offset + 3] = (value >>> 24)
|
|
return offset + 4
|
|
}
|
|
|
|
Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
|
|
value = +value
|
|
offset = offset >>> 0
|
|
if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
|
|
if (value < 0) value = 0xffffffff + value + 1
|
|
this[offset] = (value >>> 24)
|
|
this[offset + 1] = (value >>> 16)
|
|
this[offset + 2] = (value >>> 8)
|
|
this[offset + 3] = (value & 0xff)
|
|
return offset + 4
|
|
}
|
|
|
|
Buffer.prototype.writeBigInt64LE = defineBigIntMethod(function writeBigInt64LE (value, offset = 0) {
|
|
return wrtBigUInt64LE(this, value, offset, -BigInt('0x8000000000000000'), BigInt('0x7fffffffffffffff'))
|
|
})
|
|
|
|
Buffer.prototype.writeBigInt64BE = defineBigIntMethod(function writeBigInt64BE (value, offset = 0) {
|
|
return wrtBigUInt64BE(this, value, offset, -BigInt('0x8000000000000000'), BigInt('0x7fffffffffffffff'))
|
|
})
|
|
|
|
function checkIEEE754 (buf, value, offset, ext, max, min) {
|
|
if (offset + ext > buf.length) throw new RangeError('Index out of range')
|
|
if (offset < 0) throw new RangeError('Index out of range')
|
|
}
|
|
|
|
function writeFloat (buf, value, offset, littleEndian, noAssert) {
|
|
value = +value
|
|
offset = offset >>> 0
|
|
if (!noAssert) {
|
|
checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
|
|
}
|
|
ieee754.write(buf, value, offset, littleEndian, 23, 4)
|
|
return offset + 4
|
|
}
|
|
|
|
Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
|
|
return writeFloat(this, value, offset, true, noAssert)
|
|
}
|
|
|
|
Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
|
|
return writeFloat(this, value, offset, false, noAssert)
|
|
}
|
|
|
|
function writeDouble (buf, value, offset, littleEndian, noAssert) {
|
|
value = +value
|
|
offset = offset >>> 0
|
|
if (!noAssert) {
|
|
checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
|
|
}
|
|
ieee754.write(buf, value, offset, littleEndian, 52, 8)
|
|
return offset + 8
|
|
}
|
|
|
|
Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
|
|
return writeDouble(this, value, offset, true, noAssert)
|
|
}
|
|
|
|
Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
|
|
return writeDouble(this, value, offset, false, noAssert)
|
|
}
|
|
|
|
// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
|
|
Buffer.prototype.copy = function copy (target, targetStart, start, end) {
|
|
if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')
|
|
if (!start) start = 0
|
|
if (!end && end !== 0) end = this.length
|
|
if (targetStart >= target.length) targetStart = target.length
|
|
if (!targetStart) targetStart = 0
|
|
if (end > 0 && end < start) end = start
|
|
|
|
// Copy 0 bytes; we're done
|
|
if (end === start) return 0
|
|
if (target.length === 0 || this.length === 0) return 0
|
|
|
|
// Fatal error conditions
|
|
if (targetStart < 0) {
|
|
throw new RangeError('targetStart out of bounds')
|
|
}
|
|
if (start < 0 || start >= this.length) throw new RangeError('Index out of range')
|
|
if (end < 0) throw new RangeError('sourceEnd out of bounds')
|
|
|
|
// Are we oob?
|
|
if (end > this.length) end = this.length
|
|
if (target.length - targetStart < end - start) {
|
|
end = target.length - targetStart + start
|
|
}
|
|
|
|
const len = end - start
|
|
|
|
if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {
|
|
// Use built-in when available, missing from IE11
|
|
this.copyWithin(targetStart, start, end)
|
|
} else {
|
|
Uint8Array.prototype.set.call(
|
|
target,
|
|
this.subarray(start, end),
|
|
targetStart
|
|
)
|
|
}
|
|
|
|
return len
|
|
}
|
|
|
|
// Usage:
|
|
// buffer.fill(number[, offset[, end]])
|
|
// buffer.fill(buffer[, offset[, end]])
|
|
// buffer.fill(string[, offset[, end]][, encoding])
|
|
Buffer.prototype.fill = function fill (val, start, end, encoding) {
|
|
// Handle string cases:
|
|
if (typeof val === 'string') {
|
|
if (typeof start === 'string') {
|
|
encoding = start
|
|
start = 0
|
|
end = this.length
|
|
} else if (typeof end === 'string') {
|
|
encoding = end
|
|
end = this.length
|
|
}
|
|
if (encoding !== undefined && typeof encoding !== 'string') {
|
|
throw new TypeError('encoding must be a string')
|
|
}
|
|
if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
|
|
throw new TypeError('Unknown encoding: ' + encoding)
|
|
}
|
|
if (val.length === 1) {
|
|
const code = val.charCodeAt(0)
|
|
if ((encoding === 'utf8' && code < 128) ||
|
|
encoding === 'latin1') {
|
|
// Fast path: If `val` fits into a single byte, use that numeric value.
|
|
val = code
|
|
}
|
|
}
|
|
} else if (typeof val === 'number') {
|
|
val = val & 255
|
|
} else if (typeof val === 'boolean') {
|
|
val = Number(val)
|
|
}
|
|
|
|
// Invalid ranges are not set to a default, so can range check early.
|
|
if (start < 0 || this.length < start || this.length < end) {
|
|
throw new RangeError('Out of range index')
|
|
}
|
|
|
|
if (end <= start) {
|
|
return this
|
|
}
|
|
|
|
start = start >>> 0
|
|
end = end === undefined ? this.length : end >>> 0
|
|
|
|
if (!val) val = 0
|
|
|
|
let i
|
|
if (typeof val === 'number') {
|
|
for (i = start; i < end; ++i) {
|
|
this[i] = val
|
|
}
|
|
} else {
|
|
const bytes = Buffer.isBuffer(val)
|
|
? val
|
|
: Buffer.from(val, encoding)
|
|
const len = bytes.length
|
|
if (len === 0) {
|
|
throw new TypeError('The value "' + val +
|
|
'" is invalid for argument "value"')
|
|
}
|
|
for (i = 0; i < end - start; ++i) {
|
|
this[i + start] = bytes[i % len]
|
|
}
|
|
}
|
|
|
|
return this
|
|
}
|
|
|
|
// CUSTOM ERRORS
|
|
// =============
|
|
|
|
// Simplified versions from Node, changed for Buffer-only usage
|
|
const errors = {}
|
|
function E (sym, getMessage, Base) {
|
|
errors[sym] = class NodeError extends Base {
|
|
constructor () {
|
|
super()
|
|
|
|
Object.defineProperty(this, 'message', {
|
|
value: getMessage.apply(this, arguments),
|
|
writable: true,
|
|
configurable: true
|
|
})
|
|
|
|
// Add the error code to the name to include it in the stack trace.
|
|
this.name = `${this.name} [${sym}]`
|
|
// Access the stack to generate the error message including the error code
|
|
// from the name.
|
|
this.stack // eslint-disable-line no-unused-expressions
|
|
// Reset the name to the actual name.
|
|
delete this.name
|
|
}
|
|
|
|
get code () {
|
|
return sym
|
|
}
|
|
|
|
set code (value) {
|
|
Object.defineProperty(this, 'code', {
|
|
configurable: true,
|
|
enumerable: true,
|
|
value,
|
|
writable: true
|
|
})
|
|
}
|
|
|
|
toString () {
|
|
return `${this.name} [${sym}]: ${this.message}`
|
|
}
|
|
}
|
|
}
|
|
|
|
E('ERR_BUFFER_OUT_OF_BOUNDS',
|
|
function (name) {
|
|
if (name) {
|
|
return `${name} is outside of buffer bounds`
|
|
}
|
|
|
|
return 'Attempt to access memory outside buffer bounds'
|
|
}, RangeError)
|
|
E('ERR_INVALID_ARG_TYPE',
|
|
function (name, actual) {
|
|
return `The "${name}" argument must be of type number. Received type ${typeof actual}`
|
|
}, TypeError)
|
|
E('ERR_OUT_OF_RANGE',
|
|
function (str, range, input) {
|
|
let msg = `The value of "${str}" is out of range.`
|
|
let received = input
|
|
if (Number.isInteger(input) && Math.abs(input) > 2 ** 32) {
|
|
received = addNumericalSeparator(String(input))
|
|
} else if (typeof input === 'bigint') {
|
|
received = String(input)
|
|
if (input > BigInt(2) ** BigInt(32) || input < -(BigInt(2) ** BigInt(32))) {
|
|
received = addNumericalSeparator(received)
|
|
}
|
|
received += 'n'
|
|
}
|
|
msg += ` It must be ${range}. Received ${received}`
|
|
return msg
|
|
}, RangeError)
|
|
|
|
function addNumericalSeparator (val) {
|
|
let res = ''
|
|
let i = val.length
|
|
const start = val[0] === '-' ? 1 : 0
|
|
for (; i >= start + 4; i -= 3) {
|
|
res = `_${val.slice(i - 3, i)}${res}`
|
|
}
|
|
return `${val.slice(0, i)}${res}`
|
|
}
|
|
|
|
// CHECK FUNCTIONS
|
|
// ===============
|
|
|
|
function checkBounds (buf, offset, byteLength) {
|
|
validateNumber(offset, 'offset')
|
|
if (buf[offset] === undefined || buf[offset + byteLength] === undefined) {
|
|
boundsError(offset, buf.length - (byteLength + 1))
|
|
}
|
|
}
|
|
|
|
function checkIntBI (value, min, max, buf, offset, byteLength) {
|
|
if (value > max || value < min) {
|
|
const n = typeof min === 'bigint' ? 'n' : ''
|
|
let range
|
|
if (byteLength > 3) {
|
|
if (min === 0 || min === BigInt(0)) {
|
|
range = `>= 0${n} and < 2${n} ** ${(byteLength + 1) * 8}${n}`
|
|
} else {
|
|
range = `>= -(2${n} ** ${(byteLength + 1) * 8 - 1}${n}) and < 2 ** ` +
|
|
`${(byteLength + 1) * 8 - 1}${n}`
|
|
}
|
|
} else {
|
|
range = `>= ${min}${n} and <= ${max}${n}`
|
|
}
|
|
throw new errors.ERR_OUT_OF_RANGE('value', range, value)
|
|
}
|
|
checkBounds(buf, offset, byteLength)
|
|
}
|
|
|
|
function validateNumber (value, name) {
|
|
if (typeof value !== 'number') {
|
|
throw new errors.ERR_INVALID_ARG_TYPE(name, 'number', value)
|
|
}
|
|
}
|
|
|
|
function boundsError (value, length, type) {
|
|
if (Math.floor(value) !== value) {
|
|
validateNumber(value, type)
|
|
throw new errors.ERR_OUT_OF_RANGE(type || 'offset', 'an integer', value)
|
|
}
|
|
|
|
if (length < 0) {
|
|
throw new errors.ERR_BUFFER_OUT_OF_BOUNDS()
|
|
}
|
|
|
|
throw new errors.ERR_OUT_OF_RANGE(type || 'offset',
|
|
`>= ${type ? 1 : 0} and <= ${length}`,
|
|
value)
|
|
}
|
|
|
|
// HELPER FUNCTIONS
|
|
// ================
|
|
|
|
const INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g
|
|
|
|
function base64clean (str) {
|
|
// Node takes equal signs as end of the Base64 encoding
|
|
str = str.split('=')[0]
|
|
// Node strips out invalid characters like \n and \t from the string, base64-js does not
|
|
str = str.trim().replace(INVALID_BASE64_RE, '')
|
|
// Node converts strings with length < 2 to ''
|
|
if (str.length < 2) return ''
|
|
// Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
|
|
while (str.length % 4 !== 0) {
|
|
str = str + '='
|
|
}
|
|
return str
|
|
}
|
|
|
|
function utf8ToBytes (string, units) {
|
|
units = units || Infinity
|
|
let codePoint
|
|
const length = string.length
|
|
let leadSurrogate = null
|
|
const bytes = []
|
|
|
|
for (let i = 0; i < length; ++i) {
|
|
codePoint = string.charCodeAt(i)
|
|
|
|
// is surrogate component
|
|
if (codePoint > 0xD7FF && codePoint < 0xE000) {
|
|
// last char was a lead
|
|
if (!leadSurrogate) {
|
|
// no lead yet
|
|
if (codePoint > 0xDBFF) {
|
|
// unexpected trail
|
|
if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
|
|
continue
|
|
} else if (i + 1 === length) {
|
|
// unpaired lead
|
|
if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
|
|
continue
|
|
}
|
|
|
|
// valid lead
|
|
leadSurrogate = codePoint
|
|
|
|
continue
|
|
}
|
|
|
|
// 2 leads in a row
|
|
if (codePoint < 0xDC00) {
|
|
if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
|
|
leadSurrogate = codePoint
|
|
continue
|
|
}
|
|
|
|
// valid surrogate pair
|
|
codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
|
|
} else if (leadSurrogate) {
|
|
// valid bmp char, but last char was a lead
|
|
if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
|
|
}
|
|
|
|
leadSurrogate = null
|
|
|
|
// encode utf8
|
|
if (codePoint < 0x80) {
|
|
if ((units -= 1) < 0) break
|
|
bytes.push(codePoint)
|
|
} else if (codePoint < 0x800) {
|
|
if ((units -= 2) < 0) break
|
|
bytes.push(
|
|
codePoint >> 0x6 | 0xC0,
|
|
codePoint & 0x3F | 0x80
|
|
)
|
|
} else if (codePoint < 0x10000) {
|
|
if ((units -= 3) < 0) break
|
|
bytes.push(
|
|
codePoint >> 0xC | 0xE0,
|
|
codePoint >> 0x6 & 0x3F | 0x80,
|
|
codePoint & 0x3F | 0x80
|
|
)
|
|
} else if (codePoint < 0x110000) {
|
|
if ((units -= 4) < 0) break
|
|
bytes.push(
|
|
codePoint >> 0x12 | 0xF0,
|
|
codePoint >> 0xC & 0x3F | 0x80,
|
|
codePoint >> 0x6 & 0x3F | 0x80,
|
|
codePoint & 0x3F | 0x80
|
|
)
|
|
} else {
|
|
throw new Error('Invalid code point')
|
|
}
|
|
}
|
|
|
|
return bytes
|
|
}
|
|
|
|
function asciiToBytes (str) {
|
|
const byteArray = []
|
|
for (let i = 0; i < str.length; ++i) {
|
|
// Node's code seems to be doing this and not & 0x7F..
|
|
byteArray.push(str.charCodeAt(i) & 0xFF)
|
|
}
|
|
return byteArray
|
|
}
|
|
|
|
function utf16leToBytes (str, units) {
|
|
let c, hi, lo
|
|
const byteArray = []
|
|
for (let i = 0; i < str.length; ++i) {
|
|
if ((units -= 2) < 0) break
|
|
|
|
c = str.charCodeAt(i)
|
|
hi = c >> 8
|
|
lo = c % 256
|
|
byteArray.push(lo)
|
|
byteArray.push(hi)
|
|
}
|
|
|
|
return byteArray
|
|
}
|
|
|
|
function base64ToBytes (str) {
|
|
return base64.toByteArray(base64clean(str))
|
|
}
|
|
|
|
function blitBuffer (src, dst, offset, length) {
|
|
let i
|
|
for (i = 0; i < length; ++i) {
|
|
if ((i + offset >= dst.length) || (i >= src.length)) break
|
|
dst[i + offset] = src[i]
|
|
}
|
|
return i
|
|
}
|
|
|
|
// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass
|
|
// the `instanceof` check but they should be treated as of that type.
|
|
// See: https://github.com/feross/buffer/issues/166
|
|
function isInstance (obj, type) {
|
|
return obj instanceof type ||
|
|
(obj != null && obj.constructor != null && obj.constructor.name != null &&
|
|
obj.constructor.name === type.name)
|
|
}
|
|
function numberIsNaN (obj) {
|
|
// For IE11 support
|
|
return obj !== obj // eslint-disable-line no-self-compare
|
|
}
|
|
|
|
// Create lookup table for `toString('hex')`
|
|
// See: https://github.com/feross/buffer/issues/219
|
|
const hexSliceLookupTable = (function () {
|
|
const alphabet = '0123456789abcdef'
|
|
const table = new Array(256)
|
|
for (let i = 0; i < 16; ++i) {
|
|
const i16 = i * 16
|
|
for (let j = 0; j < 16; ++j) {
|
|
table[i16 + j] = alphabet[i] + alphabet[j]
|
|
}
|
|
}
|
|
return table
|
|
})()
|
|
|
|
// Return not function with Error if BigInt not supported
|
|
function defineBigIntMethod (fn) {
|
|
return typeof BigInt === 'undefined' ? BufferBigIntNotDefined : fn
|
|
}
|
|
|
|
function BufferBigIntNotDefined () {
|
|
throw new Error('BigInt not supported')
|
|
}
|