/* eslint-disable no-multi-spaces *//* eslint-disable no-return-assign */// ==UserScript==// @name               buffer// @namespace          https://github.com/feross/buffer/// @version            0.1.1// @description        The userscript port for https://github.com/feross/buffer/// @author             feross, PY-DNG// @license            MIT// ==/UserScript==/* global SharedArrayBuffer BigInt */let BufferExport = (function __MAIN__() {'use strict';const base64 = (function() {'use strict'const exports = {};exports.byteLength = byteLengthexports.toByteArray = toByteArrayexports.fromByteArray = fromByteArrayvar lookup = []var revLookup = []var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Arrayvar code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'for (var i = 0, len = code.length; i < len; ++i) {lookup[i] = code[i]revLookup[code.charCodeAt(i)] = i}// Support decoding URL-safe base64 strings, as Node.js does.// See: https://en.wikipedia.org/wiki/Base64#URL_applicationsrevLookup['-'.charCodeAt(0)] = 62revLookup['_'.charCodeAt(0)] = 63function getLens (b64) {var len = b64.lengthif (len % 4 > 0) {throw new Error('Invalid string. Length must be a multiple of 4')}// Trim off extra bytes after placeholder bytes are found// See: https://github.com/beatgammit/base64-js/issues/42var validLen = b64.indexOf('=')if (validLen === -1) validLen = lenvar placeHoldersLen = validLen === len? 0: 4 - (validLen % 4)return [validLen, placeHoldersLen]}// base64 is 4/3 + up to two characters of the original datafunction byteLength (b64) {var lens = getLens(b64)var validLen = lens[0]var placeHoldersLen = lens[1]return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen}function _byteLength (b64, validLen, placeHoldersLen) {return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen}function toByteArray (b64) {var tmpvar lens = getLens(b64)var validLen = lens[0]var placeHoldersLen = lens[1]var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen))var curByte = 0// if there are placeholders, only get up to the last complete 4 charsvar len = placeHoldersLen > 0? validLen - 4: validLenvar ifor (i = 0; i < len; i += 4) {tmp =(revLookup[b64.charCodeAt(i)] << 18) |(revLookup[b64.charCodeAt(i + 1)] << 12) |(revLookup[b64.charCodeAt(i + 2)] << 6) |revLookup[b64.charCodeAt(i + 3)]arr[curByte++] = (tmp >> 16) & 0xFFarr[curByte++] = (tmp >> 8) & 0xFFarr[curByte++] = tmp & 0xFF}if (placeHoldersLen === 2) {tmp =(revLookup[b64.charCodeAt(i)] << 2) |(revLookup[b64.charCodeAt(i + 1)] >> 4)arr[curByte++] = tmp & 0xFF}if (placeHoldersLen === 1) {tmp =(revLookup[b64.charCodeAt(i)] << 10) |(revLookup[b64.charCodeAt(i + 1)] << 4) |(revLookup[b64.charCodeAt(i + 2)] >> 2)arr[curByte++] = (tmp >> 8) & 0xFFarr[curByte++] = tmp & 0xFF}return arr}function tripletToBase64 (num) {return lookup[num >> 18 & 0x3F] +lookup[num >> 12 & 0x3F] +lookup[num >> 6 & 0x3F] +lookup[num & 0x3F]}function encodeChunk (uint8, start, end) {var tmpvar output = []for (var i = start; i < end; i += 3) {tmp =((uint8[i] << 16) & 0xFF0000) +((uint8[i + 1] << 8) & 0xFF00) +(uint8[i + 2] & 0xFF)output.push(tripletToBase64(tmp))}return output.join('')}function fromByteArray (uint8) {var tmpvar len = uint8.lengthvar extraBytes = len % 3 // if we have 1 byte left, pad 2 bytesvar parts = []var maxChunkLength = 16383 // must be multiple of 3// go through the array every three bytes, we'll deal with trailing stuff laterfor (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))}// pad the end with zeros, but make sure to not forget the extra bytesif (extraBytes === 1) {tmp = uint8[len - 1]parts.push(lookup[tmp >> 2] +lookup[(tmp << 4) & 0x3F] +'==')} else if (extraBytes === 2) {tmp = (uint8[len - 2] << 8) + uint8[len - 1]parts.push(lookup[tmp >> 10] +lookup[(tmp >> 4) & 0x3F] +lookup[(tmp << 2) & 0x3F] +'=')}return parts.join('')}return exports;})();const ieee754 = (function() {/*! ieee754. BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource> */const exports = {};exports.read = function (buffer, offset, isLE, mLen, nBytes) {var e, mvar eLen = (nBytes * 8) - mLen - 1var eMax = (1 << eLen) - 1var eBias = eMax >> 1var nBits = -7var i = isLE ? (nBytes - 1) : 0var d = isLE ? -1 : 1var s = buffer[offset + i]i += de = s & ((1 << (-nBits)) - 1)s >>= (-nBits)nBits += eLenfor (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}m = e & ((1 << (-nBits)) - 1)e >>= (-nBits)nBits += mLenfor (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}if (e === 0) {e = 1 - eBias} else if (e === eMax) {return m ? NaN : ((s ? -1 : 1) * Infinity)} else {m = m + Math.pow(2, mLen)e = e - eBias}return (s ? -1 : 1) * m * Math.pow(2, e - mLen)}exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {var e, m, cvar eLen = (nBytes * 8) - mLen - 1var eMax = (1 << eLen) - 1var eBias = eMax >> 1var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)var i = isLE ? 0 : (nBytes - 1)var d = isLE ? 1 : -1var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0value = Math.abs(value)if (isNaN(value) || value === Infinity) {m = isNaN(value) ? 1 : 0e = eMax} else {e = Math.floor(Math.log(value) / Math.LN2)if (value * (c = Math.pow(2, -e)) < 1) {e--c *= 2}if (e + eBias >= 1) {value += rt / c} else {value += rt * Math.pow(2, 1 - eBias)}if (value * c >= 2) {e++c /= 2}if (e + eBias >= eMax) {m = 0e = eMax} else if (e + eBias >= 1) {m = ((value * c) - 1) * Math.pow(2, mLen)e = e + eBias} else {m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)e = 0}}for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}e = (e << mLen) | meLen += mLenfor (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}buffer[offset + i - d] |= s * 128}return exports;});/*!* The buffer module from node.js, for the browser.** @author   Feross Aboukhadijeh <https://feross.org>* @license  MIT*//* eslint-disable no-proto */'use strict'const exports = {};const customInspectSymbol =(typeof Symbol === 'function' && typeof Symbol['for'] === 'function') // eslint-disable-line dot-notation? Symbol['for']('nodejs.util.inspect.custom') // eslint-disable-line dot-notation: nullexports.Buffer = Bufferexports.SlowBuffer = SlowBufferexports.INSPECT_MAX_BYTES = 50const K_MAX_LENGTH = 0x7fffffffexports.kMaxLength = K_MAX_LENGTH/*** If `Buffer.TYPED_ARRAY_SUPPORT`:*   === true    Use Uint8Array implementation (fastest)*   === false   Print warning and recommend using `buffer` v4.x which has an Object*               implementation (most compatible, even IE6)** Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,* Opera 11.6+, iOS 4.2+.** We report that the browser does not support typed arrays if the are not subclassable* using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`* (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support* for __proto__ and has a buggy typed array implementation.*/Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport()if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&typeof console.error === 'function') {console.error('This browser lacks typed array (Uint8Array) support which is required by ' +'`buffer` v5.x. Use `buffer` v4.x if you require old browser support.')}function typedArraySupport () {// Can typed array instances can be augmented?try {const arr = new Uint8Array(1)const proto = { foo: function () { return 42 } }Object.setPrototypeOf(proto, Uint8Array.prototype)Object.setPrototypeOf(arr, proto)return arr.foo() === 42} catch (e) {return false}}Object.defineProperty(Buffer.prototype, 'parent', {enumerable: true,get: function () {if (!Buffer.isBuffer(this)) return undefinedreturn this.buffer}})Object.defineProperty(Buffer.prototype, 'offset', {enumerable: true,get: function () {if (!Buffer.isBuffer(this)) return undefinedreturn this.byteOffset}})function createBuffer (length) {if (length > K_MAX_LENGTH) {throw new RangeError('The value "' + length + '" is invalid for option "size"')}// Return an augmented `Uint8Array` instanceconst buf = new Uint8Array(length)Object.setPrototypeOf(buf, Buffer.prototype)return buf}/*** The Buffer constructor returns instances of `Uint8Array` that have their* prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of* `Uint8Array`, so the returned instances will have all the node `Buffer` methods* and the `Uint8Array` methods. Square bracket notation works as expected -- it* returns a single octet.** The `Uint8Array` prototype remains unmodified.*/function Buffer (arg, encodingOrOffset, length) {// Common case.if (typeof arg === 'number') {if (typeof encodingOrOffset === 'string') {throw new TypeError('The "string" argument must be of type string. Received type number')}return allocUnsafe(arg)}return from(arg, encodingOrOffset, length)}Buffer.poolSize = 8192 // not used by this implementationfunction from (value, encodingOrOffset, length) {if (typeof value === 'string') {return fromString(value, encodingOrOffset)}if (ArrayBuffer.isView(value)) {return fromArrayView(value)}if (value == null) {throw new TypeError('The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +'or Array-like Object. Received type ' + (typeof value))}if (isInstance(value, ArrayBuffer) ||(value && isInstance(value.buffer, ArrayBuffer))) {return fromArrayBuffer(value, encodingOrOffset, length)}if (typeof SharedArrayBuffer !== 'undefined' &&(isInstance(value, SharedArrayBuffer) ||(value && isInstance(value.buffer, SharedArrayBuffer)))) {return fromArrayBuffer(value, encodingOrOffset, length)}if (typeof value === 'number') {throw new TypeError('The "value" argument must not be of type number. Received type number')}const valueOf = value.valueOf && value.valueOf()if (valueOf != null && valueOf !== value) {return Buffer.from(valueOf, encodingOrOffset, length)}const b = fromObject(value)if (b) return bif (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&typeof value[Symbol.toPrimitive] === 'function') {return Buffer.from(value[Symbol.toPrimitive]('string'), encodingOrOffset, length)}throw new TypeError('The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +'or Array-like Object. Received type ' + (typeof value))}/*** Functionally equivalent to Buffer(arg, encoding) but throws a TypeError* if value is a number.* Buffer.from(str[, encoding])* Buffer.from(array)* Buffer.from(buffer)* Buffer.from(arrayBuffer[, byteOffset[, length]])**/Buffer.from = function (value, encodingOrOffset, length) {return from(value, encodingOrOffset, length)}// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:// https://github.com/feross/buffer/pull/148Object.setPrototypeOf(Buffer.prototype, Uint8Array.prototype)Object.setPrototypeOf(Buffer, Uint8Array)function assertSize (size) {if (typeof size !== 'number') {throw new TypeError('"size" argument must be of type number')} else if (size < 0) {throw new RangeError('The value "' + size + '" is invalid for option "size"')}}function alloc (size, fill, encoding) {assertSize(size)if (size <= 0) {return createBuffer(size)}if (fill !== undefined) {// Only pay attention to encoding if it's a string. This// prevents accidentally sending in a number that would// be interpreted as a start offset.return typeof encoding === 'string'? createBuffer(size).fill(fill, encoding): createBuffer(size).fill(fill)}return createBuffer(size)}/*** Creates a new filled Buffer instance.* alloc(size[, fill[, encoding]])**/Buffer.alloc = function (size, fill, encoding) {return alloc(size, fill, encoding)}function allocUnsafe (size) {assertSize(size)return createBuffer(size < 0 ? 0 : checked(size) | 0)}/*** Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.* */Buffer.allocUnsafe = function (size) {return allocUnsafe(size)}/*** Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.*/Buffer.allocUnsafeSlow = function (size) {return allocUnsafe(size)}function fromString (string, encoding) {if (typeof encoding !== 'string' || encoding === '') {encoding = 'utf8'}if (!Buffer.isEncoding(encoding)) {throw new TypeError('Unknown encoding: ' + encoding)}const length = byteLength(string, encoding) | 0let buf = createBuffer(length)const actual = buf.write(string, encoding)if (actual !== length) {// Writing a hex string, for example, that contains invalid characters will// cause everything after the first invalid character to be ignored. (e.g.// 'abxxcd' will be treated as 'ab')buf = buf.slice(0, actual)}return buf}function fromArrayLike (array) {const length = array.length < 0 ? 0 : checked(array.length) | 0const buf = createBuffer(length)for (let i = 0; i < length; i += 1) {buf[i] = array[i] & 255}return buf}function fromArrayView (arrayView) {if (isInstance(arrayView, Uint8Array)) {const copy = new Uint8Array(arrayView)return fromArrayBuffer(copy.buffer, copy.byteOffset, copy.byteLength)}return fromArrayLike(arrayView)}function fromArrayBuffer (array, byteOffset, length) {if (byteOffset < 0 || array.byteLength < byteOffset) {throw new RangeError('"offset" is outside of buffer bounds')}if (array.byteLength < byteOffset + (length || 0)) {throw new RangeError('"length" is outside of buffer bounds')}let bufif (byteOffset === undefined && length === undefined) {buf = new Uint8Array(array)} else if (length === undefined) {buf = new Uint8Array(array, byteOffset)} else {buf = new Uint8Array(array, byteOffset, length)}// Return an augmented `Uint8Array` instanceObject.setPrototypeOf(buf, Buffer.prototype)return buf}function fromObject (obj) {if (Buffer.isBuffer(obj)) {const len = checked(obj.length) | 0const buf = createBuffer(len)if (buf.length === 0) {return buf}obj.copy(buf, 0, 0, len)return buf}if (obj.length !== undefined) {if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {return createBuffer(0)}return fromArrayLike(obj)}if (obj.type === 'Buffer' && Array.isArray(obj.data)) {return fromArrayLike(obj.data)}}function checked (length) {// Note: cannot use `length < K_MAX_LENGTH` here because that fails when// length is NaN (which is otherwise coerced to zero.)if (length >= K_MAX_LENGTH) {throw new RangeError('Attempt to allocate Buffer larger than maximum ' +'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')}return length | 0}function SlowBuffer (length) {if (+length != length) { // eslint-disable-line eqeqeqlength = 0}return Buffer.alloc(+length)}Buffer.isBuffer = function isBuffer (b) {return b != null && b._isBuffer === true &&b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false}Buffer.compare = function compare (a, b) {if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {throw new TypeError('The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array')}if (a === b) return 0let x = a.lengthlet y = b.lengthfor (let i = 0, len = Math.min(x, y); i < len; ++i) {if (a[i] !== b[i]) {x = a[i]y = b[i]break}}if (x < y) return -1if (y < x) return 1return 0}Buffer.isEncoding = function isEncoding (encoding) {switch (String(encoding).toLowerCase()) {case 'hex':case 'utf8':case 'utf-8':case 'ascii':case 'latin1':case 'binary':case 'base64':case 'ucs2':case 'ucs-2':case 'utf16le':case 'utf-16le':return truedefault:return false}}Buffer.concat = function concat (list, length) {if (!Array.isArray(list)) {throw new TypeError('"list" argument must be an Array of Buffers')}if (list.length === 0) {return Buffer.alloc(0)}let iif (length === undefined) {length = 0for (i = 0; i < list.length; ++i) {length += list[i].length}}const buffer = Buffer.allocUnsafe(length)let pos = 0for (i = 0; i < list.length; ++i) {let buf = list[i]if (isInstance(buf, Uint8Array)) {if (pos + buf.length > buffer.length) {if (!Buffer.isBuffer(buf)) buf = Buffer.from(buf)buf.copy(buffer, pos)} else {Uint8Array.prototype.set.call(buffer,buf,pos)}} else if (!Buffer.isBuffer(buf)) {throw new TypeError('"list" argument must be an Array of Buffers')} else {buf.copy(buffer, pos)}pos += buf.length}return buffer}function byteLength (string, encoding) {if (Buffer.isBuffer(string)) {return string.length}if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {return string.byteLength}if (typeof string !== 'string') {throw new TypeError('The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' +'Received type ' + typeof string)}const len = string.lengthconst mustMatch = (arguments.length > 2 && arguments[2] === true)if (!mustMatch && len === 0) return 0// Use a for loop to avoid recursionlet loweredCase = falsefor (;;) {switch (encoding) {case 'ascii':case 'latin1':case 'binary':return lencase 'utf8':case 'utf-8':return utf8ToBytes(string).lengthcase 'ucs2':case 'ucs-2':case 'utf16le':case 'utf-16le':return len * 2case 'hex':return len >>> 1case 'base64':return base64ToBytes(string).lengthdefault:if (loweredCase) {return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8}encoding = ('' + encoding).toLowerCase()loweredCase = true}}}Buffer.byteLength = byteLengthfunction slowToString (encoding, start, end) {let loweredCase = false// No need to verify that "this.length <= MAX_UINT32" since it's a read-only// property of a typed array.// This behaves neither like String nor Uint8Array in that we set start/end// 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) {start = 0}// Return early if start > this.length. Done here to prevent potential uint32// coercion fail below.if (start > this.length) {return ''}if (end === undefined || end > this.length) {end = this.length}if (end <= 0) {return ''}// Force coercion to uint32. This will also coerce falsey/NaN values to 0.end >>>= 0start >>>= 0if (end <= start) {return ''}if (!encoding) encoding = 'utf8'while (true) {switch (encoding) {case 'hex':return hexSlice(this, start, end)case 'utf8':case 'utf-8':return utf8Slice(this, start, end)case 'ascii':return asciiSlice(this, start, end)case 'latin1':case 'binary':return latin1Slice(this, start, end)case 'base64':return base64Slice(this, start, end)case 'ucs2':case 'ucs-2':case 'utf16le':case 'utf-16le':return utf16leSlice(this, start, end)default:if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)encoding = (encoding + '').toLowerCase()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/154Buffer.prototype._isBuffer = truefunction swap (b, n, m) {const i = b[n]b[n] = b[m]b[m] = i}Buffer.prototype.swap16 = function swap16 () {const len = this.lengthif (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.lengthif (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.lengthif (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.lengthif (length === 0) return ''if (arguments.length === 0) return utf8Slice(this, 0, length)return slowToString.apply(this, arguments)}Buffer.prototype.toLocaleString = Buffer.prototype.toStringBuffer.prototype.equals = function equals (b) {if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')if (this === b) return truereturn Buffer.compare(this, b) === 0}Buffer.prototype.inspect = function inspect () {let str = ''const max = exports.INSPECT_MAX_BYTESstr = 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 >>>= 0end >>>= 0thisStart >>>= 0thisEnd >>>= 0if (this === target) return 0let x = thisEnd - thisStartlet y = end - startconst 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 -1if (y < x) return 1return 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 lastIndexOffunction bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {// Empty buffer means no matchif (buffer.length === 0) return -1// Normalize byteOffsetif (typeof byteOffset === 'string') {encoding = byteOffsetbyteOffset = 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 bufferbyteOffset = dir ? 0 : (buffer.length - 1)}// Normalize byteOffset: negative offsets start from the end of the bufferif (byteOffset < 0) byteOffset = buffer.length + byteOffsetif (byteOffset >= buffer.length) {if (dir) return -1else byteOffset = buffer.length - 1} else if (byteOffset < 0) {if (dir) byteOffset = 0else return -1}// Normalize valif (typeof val === 'string') {val = Buffer.from(val, encoding)}// Finally, search either indexOf (if dir is true) or lastIndexOfif (Buffer.isBuffer(val)) {// Special case: looking for empty string/buffer always failsif (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 = 1let arrLength = arr.lengthlet valLength = val.lengthif (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 = 2arrLength /= 2valLength /= 2byteOffset /= 2}}function read (buf, i) {if (indexSize === 1) {return buf[i]} else {return buf.readUInt16BE(i * indexSize)}}let iif (dir) {let foundIndex = -1for (i = byteOffset; i < arrLength; i++) {if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {if (foundIndex === -1) foundIndex = iif (i - foundIndex + 1 === valLength) return foundIndex * indexSize} else {if (foundIndex !== -1) i -= i - foundIndexfoundIndex = -1}}} else {if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLengthfor (i = byteOffset; i >= 0; i--) {let found = truefor (let j = 0; j < valLength; j++) {if (read(arr, i + j) !== read(val, j)) {found = falsebreak}}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) || 0const remaining = buf.length - offsetif (!length) {length = remaining} else {length = Number(length)if (length > remaining) {length = remaining}}const strLen = string.lengthif (length > strLen / 2) {length = strLen / 2}let ifor (i = 0; i < length; ++i) {const parsed = parseInt(string.substr(i * 2, 2), 16)if (numberIsNaN(parsed)) return ibuf[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.lengthoffset = 0// Buffer#write(string, encoding)} else if (length === undefined && typeof offset === 'string') {encoding = offsetlength = this.lengthoffset = 0// Buffer#write(string, offset[, length][, encoding])} else if (isFinite(offset)) {offset = offset >>> 0if (isFinite(length)) {length = length >>> 0if (encoding === undefined) encoding = 'utf8'} else {encoding = lengthlength = undefined}} else {throw new Error('Buffer.write(string, encoding, offset[, length]) is no longer supported')}const remaining = this.length - offsetif (length === undefined || length > remaining) length = remainingif ((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 = falsefor (;;) {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 base64Writereturn 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 = startwhile (i < end) {const firstByte = buf[i]let codePoint = nulllet bytesPerSequence = (firstByte > 0xEF)? 4: (firstByte > 0xDF)? 3: (firstByte > 0xBF)? 2: 1if (i + bytesPerSequence <= end) {let secondByte, thirdByte, fourthByte, tempCodePointswitch (bytesPerSequence) {case 1:if (firstByte < 0x80) {codePoint = firstByte}breakcase 2:secondByte = buf[i + 1]if ((secondByte & 0xC0) === 0x80) {tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)if (tempCodePoint > 0x7F) {codePoint = tempCodePoint}}breakcase 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}}breakcase 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 bytecodePoint = 0xFFFDbytesPerSequence = 1} else if (codePoint > 0xFFFF) {// encode to utf16 (surrogate pair dance)codePoint -= 0x10000res.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 safetyconst MAX_ARGUMENTS_LENGTH = 0x1000function decodeCodePointsArray (codePoints) {const len = codePoints.lengthif (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 = 0while (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.lengthif (!start || start < 0) start = 0if (!end || end < 0 || end > len) end = lenlet 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.lengthstart = ~~startend = end === undefined ? len : ~~endif (start < 0) {start += lenif (start < 0) start = 0} else if (start > len) {start = len}if (end < 0) {end += lenif (end < 0) end = 0} else if (end > len) {end = len}if (end < start) end = startconst newBuf = this.subarray(start, end)// Return an augmented `Uint8Array` instanceObject.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 >>> 0byteLength = byteLength >>> 0if (!noAssert) checkOffset(offset, byteLength, this.length)let val = this[offset]let mul = 1let i = 0while (++i < byteLength && (mul *= 0x100)) {val += this[offset + i] * mul}return val}Buffer.prototype.readUintBE =Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {offset = offset >>> 0byteLength = byteLength >>> 0if (!noAssert) {checkOffset(offset, byteLength, this.length)}let val = this[offset + --byteLength]let mul = 1while (byteLength > 0 && (mul *= 0x100)) {val += this[offset + --byteLength] * mul}return val}Buffer.prototype.readUint8 =Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {offset = offset >>> 0if (!noAssert) checkOffset(offset, 1, this.length)return this[offset]}Buffer.prototype.readUint16LE =Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {offset = offset >>> 0if (!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 >>> 0if (!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 >>> 0if (!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 >>> 0if (!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 >>> 0validateNumber(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 ** 24const hi = this[++offset] +this[++offset] * 2 ** 8 +this[++offset] * 2 ** 16 +last * 2 ** 24return BigInt(lo) + (BigInt(hi) << BigInt(32))})Buffer.prototype.readBigUInt64BE = defineBigIntMethod(function readBigUInt64BE (offset) {offset = offset >>> 0validateNumber(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 +lastreturn (BigInt(hi) << BigInt(32)) + BigInt(lo)})Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {offset = offset >>> 0byteLength = byteLength >>> 0if (!noAssert) checkOffset(offset, byteLength, this.length)let val = this[offset]let mul = 1let i = 0while (++i < byteLength && (mul *= 0x100)) {val += this[offset + i] * mul}mul *= 0x80if (val >= mul) val -= Math.pow(2, 8 * byteLength)return val}Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {offset = offset >>> 0byteLength = byteLength >>> 0if (!noAssert) checkOffset(offset, byteLength, this.length)let i = byteLengthlet mul = 1let val = this[offset + --i]while (i > 0 && (mul *= 0x100)) {val += this[offset + --i] * mul}mul *= 0x80if (val >= mul) val -= Math.pow(2, 8 * byteLength)return val}Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {offset = offset >>> 0if (!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 >>> 0if (!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 >>> 0if (!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 >>> 0if (!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 >>> 0if (!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 >>> 0validateNumber(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) // Overflowreturn (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 >>> 0validateNumber(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) + // Overflowthis[++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 >>> 0if (!noAssert) checkOffset(offset, 4, this.length)return ieee754.read(this, offset, true, 23, 4)}Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {offset = offset >>> 0if (!noAssert) checkOffset(offset, 4, this.length)return ieee754.read(this, offset, false, 23, 4)}Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {offset = offset >>> 0if (!noAssert) checkOffset(offset, 8, this.length)return ieee754.read(this, offset, true, 52, 8)}Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {offset = offset >>> 0if (!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 = +valueoffset = offset >>> 0byteLength = byteLength >>> 0if (!noAssert) {const maxBytes = Math.pow(2, 8 * byteLength) - 1checkInt(this, value, offset, byteLength, maxBytes, 0)}let mul = 1let i = 0this[offset] = value & 0xFFwhile (++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 = +valueoffset = offset >>> 0byteLength = byteLength >>> 0if (!noAssert) {const maxBytes = Math.pow(2, 8 * byteLength) - 1checkInt(this, value, offset, byteLength, maxBytes, 0)}let i = byteLength - 1let mul = 1this[offset + i] = value & 0xFFwhile (--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 = +valueoffset = offset >>> 0if (!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 = +valueoffset = offset >>> 0if (!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 = +valueoffset = offset >>> 0if (!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 = +valueoffset = offset >>> 0if (!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 = +valueoffset = offset >>> 0if (!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++] = lolo = lo >> 8buf[offset++] = lolo = lo >> 8buf[offset++] = lolo = lo >> 8buf[offset++] = lolet hi = Number(value >> BigInt(32) & BigInt(0xffffffff))buf[offset++] = hihi = hi >> 8buf[offset++] = hihi = hi >> 8buf[offset++] = hihi = hi >> 8buf[offset++] = hireturn offset}function wrtBigUInt64BE (buf, value, offset, min, max) {checkIntBI(value, min, max, buf, offset, 7)let lo = Number(value & BigInt(0xffffffff))buf[offset + 7] = lolo = lo >> 8buf[offset + 6] = lolo = lo >> 8buf[offset + 5] = lolo = lo >> 8buf[offset + 4] = lolet hi = Number(value >> BigInt(32) & BigInt(0xffffffff))buf[offset + 3] = hihi = hi >> 8buf[offset + 2] = hihi = hi >> 8buf[offset + 1] = hihi = hi >> 8buf[offset] = hireturn 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 = +valueoffset = offset >>> 0if (!noAssert) {const limit = Math.pow(2, (8 * byteLength) - 1)checkInt(this, value, offset, byteLength, limit - 1, -limit)}let i = 0let mul = 1let sub = 0this[offset] = value & 0xFFwhile (++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 = +valueoffset = offset >>> 0if (!noAssert) {const limit = Math.pow(2, (8 * byteLength) - 1)checkInt(this, value, offset, byteLength, limit - 1, -limit)}let i = byteLength - 1let mul = 1let sub = 0this[offset + i] = value & 0xFFwhile (--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 = +valueoffset = offset >>> 0if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)if (value < 0) value = 0xff + value + 1this[offset] = (value & 0xff)return offset + 1}Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {value = +valueoffset = offset >>> 0if (!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 = +valueoffset = offset >>> 0if (!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 = +valueoffset = offset >>> 0if (!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 = +valueoffset = offset >>> 0if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)if (value < 0) value = 0xffffffff + value + 1this[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 = +valueoffset = offset >>> 0if (!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 = +valueoffset = offset >>> 0if (!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 = 0if (!end && end !== 0) end = this.lengthif (targetStart >= target.length) targetStart = target.lengthif (!targetStart) targetStart = 0if (end > 0 && end < start) end = start// Copy 0 bytes; we're doneif (end === start) return 0if (target.length === 0 || this.length === 0) return 0// Fatal error conditionsif (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.lengthif (target.length - targetStart < end - start) {end = target.length - targetStart + start}const len = end - startif (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {// Use built-in when available, missing from IE11this.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 = startstart = 0end = this.length} else if (typeof end === 'string') {encoding = endend = 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 >>> 0end = end === undefined ? this.length : end >>> 0if (!val) val = 0let iif (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.lengthif (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 usageconst 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 = inputif (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 ${received}`return msg}, RangeError)function addNumericalSeparator (val) {let res = ''let i = val.lengthconst start = val[0] === '-' ? 1 : 0for (; i >= start + 4; i -= 3) {res = `_${val.slice(i - 3, i)}${res}`}return `${val.slice(0, i)}${res}`}// CHECK FUNCTIONS// ===============function checkBounds (buf, offset, byteLength) {validateNumber(offset, 'offset')if (buf[offset] === undefined || buf[offset + byteLength] === undefined) {boundsError(offset, buf.length - (byteLength + 1))}}function checkIntBI (value, min, max, buf, offset, byteLength) {if (value > max || value < min) {const n = typeof min === 'bigint' ? 'n' : ''let rangeif (byteLength > 3) {if (min === 0 || min === BigInt(0)) {range = `>= 0${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-_]/gfunction base64clean (str) {// Node takes equal signs as end of the Base64 encodingstr = str.split('=')[0]// Node strips out invalid characters like \n and \t from the string, base64-js does notstr = 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 notwhile (str.length % 4 !== 0) {str = str + '='}return str}function utf8ToBytes (string, units) {units = units || Infinitylet codePointconst length = string.lengthlet leadSurrogate = nullconst bytes = []for (let i = 0; i < length; ++i) {codePoint = string.charCodeAt(i)// is surrogate componentif (codePoint > 0xD7FF && codePoint < 0xE000) {// last char was a leadif (!leadSurrogate) {// no lead yetif (codePoint > 0xDBFF) {// unexpected trailif ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)continue} else if (i + 1 === length) {// unpaired leadif ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)continue}// valid leadleadSurrogate = codePointcontinue}// 2 leads in a rowif (codePoint < 0xDC00) {if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)leadSurrogate = codePointcontinue}// valid surrogate paircodePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000} else if (leadSurrogate) {// valid bmp char, but last char was a leadif ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)}leadSurrogate = null// encode utf8if (codePoint < 0x80) {if ((units -= 1) < 0) breakbytes.push(codePoint)} else if (codePoint < 0x800) {if ((units -= 2) < 0) breakbytes.push(codePoint >> 0x6 | 0xC0,codePoint & 0x3F | 0x80)} else if (codePoint < 0x10000) {if ((units -= 3) < 0) breakbytes.push(codePoint >> 0xC | 0xE0,codePoint >> 0x6 & 0x3F | 0x80,codePoint & 0x3F | 0x80)} else if (codePoint < 0x110000) {if ((units -= 4) < 0) breakbytes.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, loconst byteArray = []for (let i = 0; i < str.length; ++i) {if ((units -= 2) < 0) breakc = str.charCodeAt(i)hi = c >> 8lo = c % 256byteArray.push(lo)byteArray.push(hi)}return byteArray}function base64ToBytes (str) {return base64.toByteArray(base64clean(str))}function blitBuffer (src, dst, offset, length) {let ifor (i = 0; i < length; ++i) {if ((i + offset >= dst.length) || (i >= src.length)) breakdst[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/166function 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 supportreturn obj !== obj // eslint-disable-line no-self-compare}// Create lookup table for `toString('hex')`// See: https://github.com/feross/buffer/issues/219const hexSliceLookupTable = (function () {const alphabet = '0123456789abcdef'const table = new Array(256)for (let i = 0; i < 16; ++i) {const i16 = i * 16for (let j = 0; j < 16; ++j) {table[i16 + j] = alphabet[i] + alphabet[j]}}return table})()// Return not function with Error if BigInt not supportedfunction defineBigIntMethod (fn) {return typeof BigInt === 'undefined' ? BufferBigIntNotDefined : fn}function BufferBigIntNotDefined () {throw new Error('BigInt not supported')}return exports;})();