musescore-downloader

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commit ac127c7b252f5f7925e6ae17817a3c18b54d38e1
parent 3b038bf2e156d105c09e5a4ab50d6fa34c2280c7
Author: Xmader <xmader@outlook.com>
Date:   Sun,  1 Dec 2019 18:30:38 -0500

v0.4.0 - use Web Worker to generate PDF faster

Diffstat:
Mdist/main.js | 47445++++++++++++++++++++++++++++++++++++++++---------------------------------------
Mpackage.json | 3++-
Msrc/main.ts | 61+++++++++++++++++++++++++++++--------------------------------
Asrc/worker-helper.ts | 29+++++++++++++++++++++++++++++
Asrc/worker.ts | 61+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 23975 insertions(+), 23624 deletions(-)

diff --git a/dist/main.js b/dist/main.js @@ -3,7 +3,7 @@ // @namespace https://www.xmader.com/ // @homepageURL https://github.com/Xmader/musescore-downloader/ // @supportURL https://github.com/Xmader/musescore-downloader/issues -// @version 0.3.4 +// @version 0.4.0 // @description download sheet music from musescore.com for free, no login or Musescore Pro required | 免登录、免 Musescore Pro,免费下载 musescore.com 上的曲谱 // @author Xmader // @match https://musescore.com/*/* @@ -43,25359 +43,26033 @@ typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {}); - var lookup = []; - var revLookup = []; - var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array; - var inited = false; - function init () { - inited = true; - var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; - for (var i = 0, len = code.length; i < len; ++i) { - lookup[i] = code[i]; - revLookup[code.charCodeAt(i)] = i; - } - - revLookup['-'.charCodeAt(0)] = 62; - revLookup['_'.charCodeAt(0)] = 63; - } - - function toByteArray (b64) { - if (!inited) { - init(); - } - var i, j, l, tmp, placeHolders, arr; - var len = b64.length; - - if (len % 4 > 0) { - throw new Error('Invalid string. Length must be a multiple of 4') - } - - // the number of equal signs (place holders) - // if there are two placeholders, than the two characters before it - // represent one byte - // if there is only one, then the three characters before it represent 2 bytes - // this is just a cheap hack to not do indexOf twice - placeHolders = b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0; + const PDFWorker = function () { + (function () { - // base64 is 4/3 + up to two characters of the original data - arr = new Arr(len * 3 / 4 - placeHolders); - - // if there are placeholders, only get up to the last complete 4 chars - l = placeHolders > 0 ? len - 4 : len; - - var L = 0; + function __awaiter(thisArg, _arguments, P, generator) { + return new (P || (P = Promise))(function (resolve, reject) { + function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } } + function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } } + function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); } + step((generator = generator.apply(thisArg, _arguments || [])).next()); + }); + } - for (i = 0, j = 0; i < l; i += 4, j += 3) { - tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)]; - arr[L++] = (tmp >> 16) & 0xFF; - arr[L++] = (tmp >> 8) & 0xFF; - arr[L++] = tmp & 0xFF; - } + var global$1$1 = (typeof global$1 !== "undefined" ? global$1 : + typeof self !== "undefined" ? self : + typeof window !== "undefined" ? window : {}); + + var lookup = []; + var revLookup = []; + var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array; + var inited = false; + function init () { + inited = true; + var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; + for (var i = 0, len = code.length; i < len; ++i) { + lookup[i] = code[i]; + revLookup[code.charCodeAt(i)] = i; + } - if (placeHolders === 2) { - tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4); - arr[L++] = tmp & 0xFF; - } else if (placeHolders === 1) { - tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2); - arr[L++] = (tmp >> 8) & 0xFF; - arr[L++] = tmp & 0xFF; - } + revLookup['-'.charCodeAt(0)] = 62; + revLookup['_'.charCodeAt(0)] = 63; + } - return arr - } + function toByteArray (b64) { + if (!inited) { + init(); + } + var i, j, l, tmp, placeHolders, arr; + var len = b64.length; - function tripletToBase64 (num) { - return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F] - } + if (len % 4 > 0) { + throw new Error('Invalid string. Length must be a multiple of 4') + } - function encodeChunk (uint8, start, end) { - var tmp; - var output = []; - for (var i = start; i < end; i += 3) { - tmp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2]); - output.push(tripletToBase64(tmp)); - } - return output.join('') - } + // the number of equal signs (place holders) + // if there are two placeholders, than the two characters before it + // represent one byte + // if there is only one, then the three characters before it represent 2 bytes + // this is just a cheap hack to not do indexOf twice + placeHolders = b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0; - function fromByteArray (uint8) { - if (!inited) { - init(); - } - var tmp; - var len = uint8.length; - var extraBytes = len % 3; // if we have 1 byte left, pad 2 bytes - var output = ''; - var parts = []; - var maxChunkLength = 16383; // must be multiple of 3 - - // go through the array every three bytes, we'll deal with trailing stuff later - for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) { - parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength))); - } + // base64 is 4/3 + up to two characters of the original data + arr = new Arr(len * 3 / 4 - placeHolders); - // pad the end with zeros, but make sure to not forget the extra bytes - if (extraBytes === 1) { - tmp = uint8[len - 1]; - output += lookup[tmp >> 2]; - output += lookup[(tmp << 4) & 0x3F]; - output += '=='; - } else if (extraBytes === 2) { - tmp = (uint8[len - 2] << 8) + (uint8[len - 1]); - output += lookup[tmp >> 10]; - output += lookup[(tmp >> 4) & 0x3F]; - output += lookup[(tmp << 2) & 0x3F]; - output += '='; - } + // if there are placeholders, only get up to the last complete 4 chars + l = placeHolders > 0 ? len - 4 : len; - parts.push(output); + var L = 0; - return parts.join('') - } + for (i = 0, j = 0; i < l; i += 4, j += 3) { + tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)]; + arr[L++] = (tmp >> 16) & 0xFF; + arr[L++] = (tmp >> 8) & 0xFF; + arr[L++] = tmp & 0xFF; + } - function read (buffer, offset, isLE, mLen, nBytes) { - var e, m; - var eLen = nBytes * 8 - mLen - 1; - var eMax = (1 << eLen) - 1; - var eBias = eMax >> 1; - var nBits = -7; - var i = isLE ? (nBytes - 1) : 0; - var d = isLE ? -1 : 1; - var s = buffer[offset + i]; - - i += d; - - e = s & ((1 << (-nBits)) - 1); - s >>= (-nBits); - nBits += eLen; - for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {} - - m = e & ((1 << (-nBits)) - 1); - e >>= (-nBits); - nBits += mLen; - for (; 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) - } + if (placeHolders === 2) { + tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4); + arr[L++] = tmp & 0xFF; + } else if (placeHolders === 1) { + tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2); + arr[L++] = (tmp >> 8) & 0xFF; + arr[L++] = tmp & 0xFF; + } - function write (buffer, value, offset, isLE, mLen, nBytes) { - var e, m, c; - var eLen = nBytes * 8 - mLen - 1; - var eMax = (1 << eLen) - 1; - var eBias = eMax >> 1; - var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0); - var i = isLE ? 0 : (nBytes - 1); - var d = isLE ? 1 : -1; - var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0; - - value = Math.abs(value); - - if (isNaN(value) || value === Infinity) { - m = isNaN(value) ? 1 : 0; - e = 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; + return arr } - if (e + eBias >= eMax) { - m = 0; - e = 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; + function tripletToBase64 (num) { + return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F] } - } - for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {} + function encodeChunk (uint8, start, end) { + var tmp; + var output = []; + for (var i = start; i < end; i += 3) { + tmp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2]); + output.push(tripletToBase64(tmp)); + } + return output.join('') + } - e = (e << mLen) | m; - eLen += mLen; - for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {} + function fromByteArray (uint8) { + if (!inited) { + init(); + } + var tmp; + var len = uint8.length; + var extraBytes = len % 3; // if we have 1 byte left, pad 2 bytes + var output = ''; + var parts = []; + var maxChunkLength = 16383; // must be multiple of 3 + + // go through the array every three bytes, we'll deal with trailing stuff later + for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) { + parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength))); + } - buffer[offset + i - d] |= s * 128; - } + // pad the end with zeros, but make sure to not forget the extra bytes + if (extraBytes === 1) { + tmp = uint8[len - 1]; + output += lookup[tmp >> 2]; + output += lookup[(tmp << 4) & 0x3F]; + output += '=='; + } else if (extraBytes === 2) { + tmp = (uint8[len - 2] << 8) + (uint8[len - 1]); + output += lookup[tmp >> 10]; + output += lookup[(tmp >> 4) & 0x3F]; + output += lookup[(tmp << 2) & 0x3F]; + output += '='; + } - var toString = {}.toString; + parts.push(output); - var isArray = Array.isArray || function (arr) { - return toString.call(arr) == '[object Array]'; - }; + return parts.join('') + } - var INSPECT_MAX_BYTES = 50; - - /** - * If `Buffer.TYPED_ARRAY_SUPPORT`: - * === true Use Uint8Array implementation (fastest) - * === false Use 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+. - * - * Due to various browser bugs, sometimes the Object implementation will be used even - * when the browser supports typed arrays. - * - * Note: - * - * - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances, - * See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438. - * - * - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function. - * - * - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of - * incorrect length in some situations. - - * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they - * get the Object implementation, which is slower but behaves correctly. - */ - Buffer.TYPED_ARRAY_SUPPORT = global$1.TYPED_ARRAY_SUPPORT !== undefined - ? global$1.TYPED_ARRAY_SUPPORT - : true; - - function kMaxLength () { - return Buffer.TYPED_ARRAY_SUPPORT - ? 0x7fffffff - : 0x3fffffff - } + function read (buffer, offset, isLE, mLen, nBytes) { + var e, m; + var eLen = nBytes * 8 - mLen - 1; + var eMax = (1 << eLen) - 1; + var eBias = eMax >> 1; + var nBits = -7; + var i = isLE ? (nBytes - 1) : 0; + var d = isLE ? -1 : 1; + var s = buffer[offset + i]; - function createBuffer (that, length) { - if (kMaxLength() < length) { - throw new RangeError('Invalid typed array length') - } - if (Buffer.TYPED_ARRAY_SUPPORT) { - // Return an augmented `Uint8Array` instance, for best performance - that = new Uint8Array(length); - that.__proto__ = Buffer.prototype; - } else { - // Fallback: Return an object instance of the Buffer class - if (that === null) { - that = new Buffer(length); - } - that.length = length; - } + i += d; - return that - } + e = s & ((1 << (-nBits)) - 1); + s >>= (-nBits); + nBits += eLen; + for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {} - /** - * 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) { - if (!Buffer.TYPED_ARRAY_SUPPORT && !(this instanceof Buffer)) { - return new Buffer(arg, encodingOrOffset, length) - } + m = e & ((1 << (-nBits)) - 1); + e >>= (-nBits); + nBits += mLen; + for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {} - // Common case. - if (typeof arg === 'number') { - if (typeof encodingOrOffset === 'string') { - throw new Error( - 'If encoding is specified then the first argument must be a string' - ) + 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) } - return allocUnsafe(this, arg) - } - return from(this, arg, encodingOrOffset, length) - } - Buffer.poolSize = 8192; // not used by this implementation + function write (buffer, value, offset, isLE, mLen, nBytes) { + var e, m, c; + var eLen = nBytes * 8 - mLen - 1; + var eMax = (1 << eLen) - 1; + var eBias = eMax >> 1; + var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0); + var i = isLE ? 0 : (nBytes - 1); + var d = isLE ? 1 : -1; + var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0; - // TODO: Legacy, not needed anymore. Remove in next major version. - Buffer._augment = function (arr) { - arr.__proto__ = Buffer.prototype; - return arr - }; - - function from (that, value, encodingOrOffset, length) { - if (typeof value === 'number') { - throw new TypeError('"value" argument must not be a number') - } + value = Math.abs(value); - if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) { - return fromArrayBuffer(that, value, encodingOrOffset, length) - } + if (isNaN(value) || value === Infinity) { + m = isNaN(value) ? 1 : 0; + e = 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 (typeof value === 'string') { - return fromString(that, value, encodingOrOffset) - } + if (e + eBias >= eMax) { + m = 0; + e = 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; + } + } - return fromObject(that, value) - } + for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {} - /** - * 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(null, value, encodingOrOffset, length) - }; + e = (e << mLen) | m; + eLen += mLen; + for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {} - if (Buffer.TYPED_ARRAY_SUPPORT) { - Buffer.prototype.__proto__ = Uint8Array.prototype; - Buffer.__proto__ = Uint8Array; - } + buffer[offset + i - d] |= s * 128; + } - function assertSize (size) { - if (typeof size !== 'number') { - throw new TypeError('"size" argument must be a number') - } else if (size < 0) { - throw new RangeError('"size" argument must not be negative') - } - } + var toString = {}.toString; - function alloc (that, size, fill, encoding) { - assertSize(size); - if (size <= 0) { - return createBuffer(that, size) - } - if (fill !== undefined) { - // Only pay attention to encoding if it's a string. This - // prevents accidentally sending in a number that would - // be interpretted as a start offset. - return typeof encoding === 'string' - ? createBuffer(that, size).fill(fill, encoding) - : createBuffer(that, size).fill(fill) - } - return createBuffer(that, size) - } + var isArray = Array.isArray || function (arr) { + return toString.call(arr) == '[object Array]'; + }; - /** - * Creates a new filled Buffer instance. - * alloc(size[, fill[, encoding]]) - **/ - Buffer.alloc = function (size, fill, encoding) { - return alloc(null, size, fill, encoding) - }; + var INSPECT_MAX_BYTES = 50; + + /** + * If `Buffer.TYPED_ARRAY_SUPPORT`: + * === true Use Uint8Array implementation (fastest) + * === false Use 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+. + * + * Due to various browser bugs, sometimes the Object implementation will be used even + * when the browser supports typed arrays. + * + * Note: + * + * - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances, + * See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438. + * + * - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function. + * + * - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of + * incorrect length in some situations. + + * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they + * get the Object implementation, which is slower but behaves correctly. + */ + Buffer.TYPED_ARRAY_SUPPORT = global$1$1.TYPED_ARRAY_SUPPORT !== undefined + ? global$1$1.TYPED_ARRAY_SUPPORT + : true; - function allocUnsafe (that, size) { - assertSize(size); - that = createBuffer(that, size < 0 ? 0 : checked(size) | 0); - if (!Buffer.TYPED_ARRAY_SUPPORT) { - for (var i = 0; i < size; ++i) { - that[i] = 0; + function kMaxLength () { + return Buffer.TYPED_ARRAY_SUPPORT + ? 0x7fffffff + : 0x3fffffff } - } - return that - } - /** - * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance. - * */ - Buffer.allocUnsafe = function (size) { - return allocUnsafe(null, size) - }; - /** - * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance. - */ - Buffer.allocUnsafeSlow = function (size) { - return allocUnsafe(null, size) - }; + function createBuffer (that, length) { + if (kMaxLength() < length) { + throw new RangeError('Invalid typed array length') + } + if (Buffer.TYPED_ARRAY_SUPPORT) { + // Return an augmented `Uint8Array` instance, for best performance + that = new Uint8Array(length); + that.__proto__ = Buffer.prototype; + } else { + // Fallback: Return an object instance of the Buffer class + if (that === null) { + that = new Buffer(length); + } + that.length = length; + } - function fromString (that, string, encoding) { - if (typeof encoding !== 'string' || encoding === '') { - encoding = 'utf8'; - } + return that + } - if (!Buffer.isEncoding(encoding)) { - throw new TypeError('"encoding" must be a valid string encoding') - } + /** + * 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. + */ - var length = byteLength(string, encoding) | 0; - that = createBuffer(that, length); + function Buffer (arg, encodingOrOffset, length) { + if (!Buffer.TYPED_ARRAY_SUPPORT && !(this instanceof Buffer)) { + return new Buffer(arg, encodingOrOffset, length) + } - var actual = that.write(string, encoding); + // Common case. + if (typeof arg === 'number') { + if (typeof encodingOrOffset === 'string') { + throw new Error( + 'If encoding is specified then the first argument must be a string' + ) + } + return allocUnsafe(this, arg) + } + return from(this, arg, encodingOrOffset, length) + } - 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') - that = that.slice(0, actual); - } + Buffer.poolSize = 8192; // not used by this implementation - return that - } + // TODO: Legacy, not needed anymore. Remove in next major version. + Buffer._augment = function (arr) { + arr.__proto__ = Buffer.prototype; + return arr + }; - function fromArrayLike (that, array) { - var length = array.length < 0 ? 0 : checked(array.length) | 0; - that = createBuffer(that, length); - for (var i = 0; i < length; i += 1) { - that[i] = array[i] & 255; - } - return that - } + function from (that, value, encodingOrOffset, length) { + if (typeof value === 'number') { + throw new TypeError('"value" argument must not be a number') + } - function fromArrayBuffer (that, array, byteOffset, length) { - array.byteLength; // this throws if `array` is not a valid ArrayBuffer + if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) { + return fromArrayBuffer(that, value, encodingOrOffset, length) + } - if (byteOffset < 0 || array.byteLength < byteOffset) { - throw new RangeError('\'offset\' is out of bounds') - } + if (typeof value === 'string') { + return fromString(that, value, encodingOrOffset) + } - if (array.byteLength < byteOffset + (length || 0)) { - throw new RangeError('\'length\' is out of bounds') - } + return fromObject(that, value) + } - if (byteOffset === undefined && length === undefined) { - array = new Uint8Array(array); - } else if (length === undefined) { - array = new Uint8Array(array, byteOffset); - } else { - array = new Uint8Array(array, byteOffset, length); - } + /** + * 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(null, value, encodingOrOffset, length) + }; - if (Buffer.TYPED_ARRAY_SUPPORT) { - // Return an augmented `Uint8Array` instance, for best performance - that = array; - that.__proto__ = Buffer.prototype; - } else { - // Fallback: Return an object instance of the Buffer class - that = fromArrayLike(that, array); - } - return that - } + if (Buffer.TYPED_ARRAY_SUPPORT) { + Buffer.prototype.__proto__ = Uint8Array.prototype; + Buffer.__proto__ = Uint8Array; + } - function fromObject (that, obj) { - if (internalIsBuffer(obj)) { - var len = checked(obj.length) | 0; - that = createBuffer(that, len); + function assertSize (size) { + if (typeof size !== 'number') { + throw new TypeError('"size" argument must be a number') + } else if (size < 0) { + throw new RangeError('"size" argument must not be negative') + } + } - if (that.length === 0) { - return that + function alloc (that, size, fill, encoding) { + assertSize(size); + if (size <= 0) { + return createBuffer(that, size) + } + if (fill !== undefined) { + // Only pay attention to encoding if it's a string. This + // prevents accidentally sending in a number that would + // be interpretted as a start offset. + return typeof encoding === 'string' + ? createBuffer(that, size).fill(fill, encoding) + : createBuffer(that, size).fill(fill) + } + return createBuffer(that, size) } - obj.copy(that, 0, 0, len); - return that - } + /** + * Creates a new filled Buffer instance. + * alloc(size[, fill[, encoding]]) + **/ + Buffer.alloc = function (size, fill, encoding) { + return alloc(null, size, fill, encoding) + }; - if (obj) { - if ((typeof ArrayBuffer !== 'undefined' && - obj.buffer instanceof ArrayBuffer) || 'length' in obj) { - if (typeof obj.length !== 'number' || isnan(obj.length)) { - return createBuffer(that, 0) + function allocUnsafe (that, size) { + assertSize(size); + that = createBuffer(that, size < 0 ? 0 : checked(size) | 0); + if (!Buffer.TYPED_ARRAY_SUPPORT) { + for (var i = 0; i < size; ++i) { + that[i] = 0; + } } - return fromArrayLike(that, obj) + return that } - if (obj.type === 'Buffer' && isArray(obj.data)) { - return fromArrayLike(that, obj.data) - } - } + /** + * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance. + * */ + Buffer.allocUnsafe = function (size) { + return allocUnsafe(null, size) + }; + /** + * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance. + */ + Buffer.allocUnsafeSlow = function (size) { + return allocUnsafe(null, size) + }; - throw new TypeError('First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.') - } + function fromString (that, string, encoding) { + if (typeof encoding !== 'string' || encoding === '') { + encoding = 'utf8'; + } - function checked (length) { - // Note: cannot use `length < kMaxLength()` here because that fails when - // length is NaN (which is otherwise coerced to zero.) - if (length >= kMaxLength()) { - throw new RangeError('Attempt to allocate Buffer larger than maximum ' + - 'size: 0x' + kMaxLength().toString(16) + ' bytes') - } - return length | 0 - } - Buffer.isBuffer = isBuffer; - function internalIsBuffer (b) { - return !!(b != null && b._isBuffer) - } + if (!Buffer.isEncoding(encoding)) { + throw new TypeError('"encoding" must be a valid string encoding') + } - Buffer.compare = function compare (a, b) { - if (!internalIsBuffer(a) || !internalIsBuffer(b)) { - throw new TypeError('Arguments must be Buffers') - } + var length = byteLength(string, encoding) | 0; + that = createBuffer(that, length); - if (a === b) return 0 + var actual = that.write(string, encoding); - var x = a.length; - var y = b.length; + 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') + that = that.slice(0, actual); + } - for (var i = 0, len = Math.min(x, y); i < len; ++i) { - if (a[i] !== b[i]) { - x = a[i]; - y = b[i]; - break + return that } - } - if (x < y) return -1 - if (y < x) return 1 - return 0 - }; + function fromArrayLike (that, array) { + var length = array.length < 0 ? 0 : checked(array.length) | 0; + that = createBuffer(that, length); + for (var i = 0; i < length; i += 1) { + that[i] = array[i] & 255; + } + return that + } - 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 true - default: - return false - } - }; + function fromArrayBuffer (that, array, byteOffset, length) { + array.byteLength; // this throws if `array` is not a valid ArrayBuffer - Buffer.concat = function concat (list, length) { - if (!isArray(list)) { - throw new TypeError('"list" argument must be an Array of Buffers') - } + if (byteOffset < 0 || array.byteLength < byteOffset) { + throw new RangeError('\'offset\' is out of bounds') + } - if (list.length === 0) { - return Buffer.alloc(0) - } + if (array.byteLength < byteOffset + (length || 0)) { + throw new RangeError('\'length\' is out of bounds') + } - var i; - if (length === undefined) { - length = 0; - for (i = 0; i < list.length; ++i) { - length += list[i].length; - } - } + if (byteOffset === undefined && length === undefined) { + array = new Uint8Array(array); + } else if (length === undefined) { + array = new Uint8Array(array, byteOffset); + } else { + array = new Uint8Array(array, byteOffset, length); + } - var buffer = Buffer.allocUnsafe(length); - var pos = 0; - for (i = 0; i < list.length; ++i) { - var buf = list[i]; - if (!internalIsBuffer(buf)) { - throw new TypeError('"list" argument must be an Array of Buffers') + if (Buffer.TYPED_ARRAY_SUPPORT) { + // Return an augmented `Uint8Array` instance, for best performance + that = array; + that.__proto__ = Buffer.prototype; + } else { + // Fallback: Return an object instance of the Buffer class + that = fromArrayLike(that, array); + } + return that } - buf.copy(buffer, pos); - pos += buf.length; - } - return buffer - }; - function byteLength (string, encoding) { - if (internalIsBuffer(string)) { - return string.length - } - if (typeof ArrayBuffer !== 'undefined' && typeof ArrayBuffer.isView === 'function' && - (ArrayBuffer.isView(string) || string instanceof ArrayBuffer)) { - return string.byteLength - } - if (typeof string !== 'string') { - string = '' + string; - } + function fromObject (that, obj) { + if (internalIsBuffer(obj)) { + var len = checked(obj.length) | 0; + that = createBuffer(that, len); - var len = string.length; - if (len === 0) return 0 - - // Use a for loop to avoid recursion - var loweredCase = false; - for (;;) { - switch (encoding) { - case 'ascii': - case 'latin1': - case 'binary': - return len - case 'utf8': - case 'utf-8': - case undefined: - return utf8ToBytes(string).length - case 'ucs2': - case 'ucs-2': - case 'utf16le': - case 'utf-16le': - return len * 2 - case 'hex': - return len >>> 1 - case 'base64': - return base64ToBytes(string).length - default: - if (loweredCase) return utf8ToBytes(string).length // assume utf8 - encoding = ('' + encoding).toLowerCase(); - loweredCase = true; - } - } - } - Buffer.byteLength = byteLength; + if (that.length === 0) { + return that + } - function slowToString (encoding, start, end) { - var loweredCase = false; + obj.copy(that, 0, 0, len); + return that + } - // No need to verify that "this.length <= MAX_UINT32" since it's a read-only - // property of a typed array. + if (obj) { + if ((typeof ArrayBuffer !== 'undefined' && + obj.buffer instanceof ArrayBuffer) || 'length' in obj) { + if (typeof obj.length !== 'number' || isnan(obj.length)) { + return createBuffer(that, 0) + } + return fromArrayLike(that, obj) + } - // 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 (obj.type === 'Buffer' && isArray(obj.data)) { + return fromArrayLike(that, obj.data) + } + } - if (end === undefined || end > this.length) { - end = this.length; - } + throw new TypeError('First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.') + } - if (end <= 0) { - return '' - } + function checked (length) { + // Note: cannot use `length < kMaxLength()` here because that fails when + // length is NaN (which is otherwise coerced to zero.) + if (length >= kMaxLength()) { + throw new RangeError('Attempt to allocate Buffer larger than maximum ' + + 'size: 0x' + kMaxLength().toString(16) + ' bytes') + } + return length | 0 + } + Buffer.isBuffer = isBuffer; + function internalIsBuffer (b) { + return !!(b != null && b._isBuffer) + } - // Force coersion to uint32. This will also coerce falsey/NaN values to 0. - end >>>= 0; - start >>>= 0; + Buffer.compare = function compare (a, b) { + if (!internalIsBuffer(a) || !internalIsBuffer(b)) { + throw new TypeError('Arguments must be Buffers') + } - if (end <= start) { - return '' - } + if (a === b) return 0 - if (!encoding) encoding = 'utf8'; + var x = a.length; + var y = b.length; - while (true) { - switch (encoding) { - case 'hex': - return hexSlice(this, start, end) + for (var i = 0, len = Math.min(x, y); i < len; ++i) { + if (a[i] !== b[i]) { + x = a[i]; + y = b[i]; + break + } + } - case 'utf8': - case 'utf-8': - return utf8Slice(this, start, end) + if (x < y) return -1 + if (y < x) return 1 + return 0 + }; - case 'ascii': - return asciiSlice(this, start, end) + 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 true + default: + return false + } + }; - case 'latin1': - case 'binary': - return latin1Slice(this, start, end) + Buffer.concat = function concat (list, length) { + if (!isArray(list)) { + throw new TypeError('"list" argument must be an Array of Buffers') + } - case 'base64': - return base64Slice(this, start, end) + if (list.length === 0) { + return Buffer.alloc(0) + } - case 'ucs2': - case 'ucs-2': - case 'utf16le': - case 'utf-16le': - return utf16leSlice(this, start, end) + var i; + if (length === undefined) { + length = 0; + for (i = 0; i < list.length; ++i) { + length += list[i].length; + } + } - default: - if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding) - encoding = (encoding + '').toLowerCase(); - loweredCase = true; - } - } - } + var buffer = Buffer.allocUnsafe(length); + var pos = 0; + for (i = 0; i < list.length; ++i) { + var buf = list[i]; + if (!internalIsBuffer(buf)) { + throw new TypeError('"list" argument must be an Array of Buffers') + } + buf.copy(buffer, pos); + pos += buf.length; + } + return buffer + }; - // The property is used by `Buffer.isBuffer` and `is-buffer` (in Safari 5-7) to detect - // Buffer instances. - Buffer.prototype._isBuffer = true; + function byteLength (string, encoding) { + if (internalIsBuffer(string)) { + return string.length + } + if (typeof ArrayBuffer !== 'undefined' && typeof ArrayBuffer.isView === 'function' && + (ArrayBuffer.isView(string) || string instanceof ArrayBuffer)) { + return string.byteLength + } + if (typeof string !== 'string') { + string = '' + string; + } - function swap (b, n, m) { - var i = b[n]; - b[n] = b[m]; - b[m] = i; - } + var len = string.length; + if (len === 0) return 0 + + // Use a for loop to avoid recursion + var loweredCase = false; + for (;;) { + switch (encoding) { + case 'ascii': + case 'latin1': + case 'binary': + return len + case 'utf8': + case 'utf-8': + case undefined: + return utf8ToBytes(string).length + case 'ucs2': + case 'ucs-2': + case 'utf16le': + case 'utf-16le': + return len * 2 + case 'hex': + return len >>> 1 + case 'base64': + return base64ToBytes(string).length + default: + if (loweredCase) return utf8ToBytes(string).length // assume utf8 + encoding = ('' + encoding).toLowerCase(); + loweredCase = true; + } + } + } + Buffer.byteLength = byteLength; - Buffer.prototype.swap16 = function swap16 () { - var len = this.length; - if (len % 2 !== 0) { - throw new RangeError('Buffer size must be a multiple of 16-bits') - } - for (var i = 0; i < len; i += 2) { - swap(this, i, i + 1); - } - return this - }; + function slowToString (encoding, start, end) { + var loweredCase = false; - Buffer.prototype.swap32 = function swap32 () { - var len = this.length; - if (len % 4 !== 0) { - throw new RangeError('Buffer size must be a multiple of 32-bits') - } - for (var i = 0; i < len; i += 4) { - swap(this, i, i + 3); - swap(this, i + 1, i + 2); - } - return this - }; + // No need to verify that "this.length <= MAX_UINT32" since it's a read-only + // property of a typed array. - Buffer.prototype.swap64 = function swap64 () { - var len = this.length; - if (len % 8 !== 0) { - throw new RangeError('Buffer size must be a multiple of 64-bits') - } - for (var 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 - }; + // 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 '' + } - Buffer.prototype.toString = function toString () { - var length = this.length | 0; - if (length === 0) return '' - if (arguments.length === 0) return utf8Slice(this, 0, length) - return slowToString.apply(this, arguments) - }; + if (end === undefined || end > this.length) { + end = this.length; + } - Buffer.prototype.equals = function equals (b) { - if (!internalIsBuffer(b)) throw new TypeError('Argument must be a Buffer') - if (this === b) return true - return Buffer.compare(this, b) === 0 - }; + if (end <= 0) { + return '' + } - Buffer.prototype.inspect = function inspect () { - var str = ''; - var max = INSPECT_MAX_BYTES; - if (this.length > 0) { - str = this.toString('hex', 0, max).match(/.{2}/g).join(' '); - if (this.length > max) str += ' ... '; - } - return '<Buffer ' + str + '>' - }; + // Force coersion to uint32. This will also coerce falsey/NaN values to 0. + end >>>= 0; + start >>>= 0; - Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) { - if (!internalIsBuffer(target)) { - throw new TypeError('Argument must be a Buffer') - } + if (end <= start) { + return '' + } - 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 (!encoding) encoding = 'utf8'; - if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) { - throw new RangeError('out of range index') - } + while (true) { + switch (encoding) { + case 'hex': + return hexSlice(this, start, end) - if (thisStart >= thisEnd && start >= end) { - return 0 - } - if (thisStart >= thisEnd) { - return -1 - } - if (start >= end) { - return 1 - } + case 'utf8': + case 'utf-8': + return utf8Slice(this, start, end) - start >>>= 0; - end >>>= 0; - thisStart >>>= 0; - thisEnd >>>= 0; + case 'ascii': + return asciiSlice(this, start, end) - if (this === target) return 0 + case 'latin1': + case 'binary': + return latin1Slice(this, start, end) - var x = thisEnd - thisStart; - var y = end - start; - var len = Math.min(x, y); + case 'base64': + return base64Slice(this, start, end) - var thisCopy = this.slice(thisStart, thisEnd); - var targetCopy = target.slice(start, end); + case 'ucs2': + case 'ucs-2': + case 'utf16le': + case 'utf-16le': + return utf16leSlice(this, start, end) - for (var i = 0; i < len; ++i) { - if (thisCopy[i] !== targetCopy[i]) { - x = thisCopy[i]; - y = targetCopy[i]; - break + default: + if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding) + encoding = (encoding + '').toLowerCase(); + loweredCase = true; + } + } } - } - if (x < y) return -1 - if (y < x) return 1 - return 0 - }; + // The property is used by `Buffer.isBuffer` and `is-buffer` (in Safari 5-7) to detect + // Buffer instances. + Buffer.prototype._isBuffer = true; - // 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 (isNaN(byteOffset)) { - // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer - byteOffset = dir ? 0 : (buffer.length - 1); - } + function swap (b, n, m) { + var i = b[n]; + b[n] = b[m]; + b[m] = i; + } - // 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 - } + Buffer.prototype.swap16 = function swap16 () { + var len = this.length; + if (len % 2 !== 0) { + throw new RangeError('Buffer size must be a multiple of 16-bits') + } + for (var i = 0; i < len; i += 2) { + swap(this, i, i + 1); + } + return this + }; - // Normalize val - if (typeof val === 'string') { - val = Buffer.from(val, encoding); - } + Buffer.prototype.swap32 = function swap32 () { + var len = this.length; + if (len % 4 !== 0) { + throw new RangeError('Buffer size must be a multiple of 32-bits') + } + for (var i = 0; i < len; i += 4) { + swap(this, i, i + 3); + swap(this, i + 1, i + 2); + } + return this + }; - // Finally, search either indexOf (if dir is true) or lastIndexOf - if (internalIsBuffer(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 (Buffer.TYPED_ARRAY_SUPPORT && - typeof Uint8Array.prototype.indexOf === 'function') { - if (dir) { - return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset) - } else { - return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset) + Buffer.prototype.swap64 = function swap64 () { + var len = this.length; + if (len % 8 !== 0) { + throw new RangeError('Buffer size must be a multiple of 64-bits') } - } - return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir) - } + for (var 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 + }; - throw new TypeError('val must be string, number or Buffer') - } + Buffer.prototype.toString = function toString () { + var length = this.length | 0; + if (length === 0) return '' + if (arguments.length === 0) return utf8Slice(this, 0, length) + return slowToString.apply(this, arguments) + }; - function arrayIndexOf (arr, val, byteOffset, encoding, dir) { - var indexSize = 1; - var arrLength = arr.length; - var valLength = val.length; + Buffer.prototype.equals = function equals (b) { + if (!internalIsBuffer(b)) throw new TypeError('Argument must be a Buffer') + if (this === b) return true + return Buffer.compare(this, b) === 0 + }; - 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 + Buffer.prototype.inspect = function inspect () { + var str = ''; + var max = INSPECT_MAX_BYTES; + if (this.length > 0) { + str = this.toString('hex', 0, max).match(/.{2}/g).join(' '); + if (this.length > max) str += ' ... '; } - indexSize = 2; - arrLength /= 2; - valLength /= 2; - byteOffset /= 2; - } - } + return '<Buffer ' + str + '>' + }; - function read (buf, i) { - if (indexSize === 1) { - return buf[i] - } else { - return buf.readUInt16BE(i * indexSize) - } - } + Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) { + if (!internalIsBuffer(target)) { + throw new TypeError('Argument must be a Buffer') + } - var i; - if (dir) { - var 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; + if (start === undefined) { + start = 0; } - } - } else { - if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength; - for (i = byteOffset; i >= 0; i--) { - var found = true; - for (var j = 0; j < valLength; j++) { - if (read(arr, i + j) !== read(val, j)) { - found = false; - break - } + if (end === undefined) { + end = target ? target.length : 0; + } + if (thisStart === undefined) { + thisStart = 0; + } + if (thisEnd === undefined) { + thisEnd = this.length; } - if (found) return i - } - } - return -1 - } + if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) { + throw new RangeError('out of range index') + } - Buffer.prototype.includes = function includes (val, byteOffset, encoding) { - return this.indexOf(val, byteOffset, encoding) !== -1 - }; + if (thisStart >= thisEnd && start >= end) { + return 0 + } + if (thisStart >= thisEnd) { + return -1 + } + if (start >= end) { + return 1 + } - Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) { - return bidirectionalIndexOf(this, val, byteOffset, encoding, true) - }; + start >>>= 0; + end >>>= 0; + thisStart >>>= 0; + thisEnd >>>= 0; - Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) { - return bidirectionalIndexOf(this, val, byteOffset, encoding, false) - }; + if (this === target) return 0 - function hexWrite (buf, string, offset, length) { - offset = Number(offset) || 0; - var remaining = buf.length - offset; - if (!length) { - length = remaining; - } else { - length = Number(length); - if (length > remaining) { - length = remaining; - } - } + var x = thisEnd - thisStart; + var y = end - start; + var len = Math.min(x, y); - // must be an even number of digits - var strLen = string.length; - if (strLen % 2 !== 0) throw new TypeError('Invalid hex string') + var thisCopy = this.slice(thisStart, thisEnd); + var targetCopy = target.slice(start, end); - if (length > strLen / 2) { - length = strLen / 2; - } - for (var i = 0; i < length; ++i) { - var parsed = parseInt(string.substr(i * 2, 2), 16); - if (isNaN(parsed)) return i - buf[offset + i] = parsed; - } - return i - } + for (var i = 0; i < len; ++i) { + if (thisCopy[i] !== targetCopy[i]) { + x = thisCopy[i]; + y = targetCopy[i]; + break + } + } - function utf8Write (buf, string, offset, length) { - return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length) - } + if (x < y) return -1 + if (y < x) return 1 + return 0 + }; - function asciiWrite (buf, string, offset, length) { - return blitBuffer(asciiToBytes(string), buf, offset, length) - } + // 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 (isNaN(byteOffset)) { + // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer + byteOffset = dir ? 0 : (buffer.length - 1); + } - function latin1Write (buf, string, offset, length) { - return asciiWrite(buf, string, offset, length) - } + // 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 + } - function base64Write (buf, string, offset, length) { - return blitBuffer(base64ToBytes(string), buf, offset, length) - } + // Normalize val + if (typeof val === 'string') { + val = Buffer.from(val, encoding); + } - function ucs2Write (buf, string, offset, length) { - return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length) - } + // Finally, search either indexOf (if dir is true) or lastIndexOf + if (internalIsBuffer(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 (Buffer.TYPED_ARRAY_SUPPORT && + 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) + } - 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; - } - // legacy write(string, encoding, offset, length) - remove in v0.13 - } else { - throw new Error( - 'Buffer.write(string, encoding, offset[, length]) is no longer supported' - ) - } + throw new TypeError('val must be string, number or Buffer') + } - var remaining = this.length - offset; - if (length === undefined || length > remaining) length = remaining; + function arrayIndexOf (arr, val, byteOffset, encoding, dir) { + var indexSize = 1; + var arrLength = arr.length; + var valLength = val.length; - if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) { - throw new RangeError('Attempt to write outside buffer bounds') - } + 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; + } + } - if (!encoding) encoding = 'utf8'; + function read (buf, i) { + if (indexSize === 1) { + return buf[i] + } else { + return buf.readUInt16BE(i * indexSize) + } + } + + var i; + if (dir) { + var 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--) { + var found = true; + for (var j = 0; j < valLength; j++) { + if (read(arr, i + j) !== read(val, j)) { + found = false; + break + } + } + if (found) return i + } + } - var loweredCase = false; - for (;;) { - switch (encoding) { - case 'hex': - return hexWrite(this, string, offset, length) + return -1 + } - case 'utf8': - case 'utf-8': - return utf8Write(this, string, offset, length) + Buffer.prototype.includes = function includes (val, byteOffset, encoding) { + return this.indexOf(val, byteOffset, encoding) !== -1 + }; - case 'ascii': - return asciiWrite(this, string, offset, length) + Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) { + return bidirectionalIndexOf(this, val, byteOffset, encoding, true) + }; - case 'latin1': - case 'binary': - return latin1Write(this, string, offset, length) + Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) { + return bidirectionalIndexOf(this, val, byteOffset, encoding, false) + }; - case 'base64': - // Warning: maxLength not taken into account in base64Write - return base64Write(this, string, offset, length) + function hexWrite (buf, string, offset, length) { + offset = Number(offset) || 0; + var remaining = buf.length - offset; + if (!length) { + length = remaining; + } else { + length = Number(length); + if (length > remaining) { + length = remaining; + } + } - case 'ucs2': - case 'ucs-2': - case 'utf16le': - case 'utf-16le': - return ucs2Write(this, string, offset, length) + // must be an even number of digits + var strLen = string.length; + if (strLen % 2 !== 0) throw new TypeError('Invalid hex string') - default: - if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding) - encoding = ('' + encoding).toLowerCase(); - loweredCase = true; + if (length > strLen / 2) { + length = strLen / 2; + } + for (var i = 0; i < length; ++i) { + var parsed = parseInt(string.substr(i * 2, 2), 16); + if (isNaN(parsed)) return i + buf[offset + i] = parsed; + } + return i } - } - }; - Buffer.prototype.toJSON = function toJSON () { - return { - type: 'Buffer', - data: Array.prototype.slice.call(this._arr || this, 0) - } - }; + function utf8Write (buf, string, offset, length) { + return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length) + } - function base64Slice (buf, start, end) { - if (start === 0 && end === buf.length) { - return fromByteArray(buf) - } else { - return fromByteArray(buf.slice(start, end)) - } - } + function asciiWrite (buf, string, offset, length) { + return blitBuffer(asciiToBytes(string), buf, offset, length) + } - function utf8Slice (buf, start, end) { - end = Math.min(buf.length, end); - var res = []; + function latin1Write (buf, string, offset, length) { + return asciiWrite(buf, string, offset, length) + } - var i = start; - while (i < end) { - var firstByte = buf[i]; - var codePoint = null; - var bytesPerSequence = (firstByte > 0xEF) ? 4 - : (firstByte > 0xDF) ? 3 - : (firstByte > 0xBF) ? 2 - : 1; + function base64Write (buf, string, offset, length) { + return blitBuffer(base64ToBytes(string), buf, offset, length) + } - if (i + bytesPerSequence <= end) { - var secondByte, thirdByte, fourthByte, tempCodePoint; + function ucs2Write (buf, string, offset, length) { + return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length) + } - 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; - } - } + 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; + } + // legacy write(string, encoding, offset, length) - remove in v0.13 + } else { + throw new Error( + 'Buffer.write(string, encoding, offset[, length]) is no longer supported' + ) } - } - 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; - } + var remaining = this.length - offset; + if (length === undefined || length > remaining) length = remaining; - res.push(codePoint); - i += bytesPerSequence; - } + if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) { + throw new RangeError('Attempt to write outside buffer bounds') + } - return decodeCodePointsArray(res) - } + if (!encoding) encoding = 'utf8'; - // 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 - var MAX_ARGUMENTS_LENGTH = 0x1000; + var loweredCase = false; + for (;;) { + switch (encoding) { + case 'hex': + return hexWrite(this, string, offset, length) - function decodeCodePointsArray (codePoints) { - var len = codePoints.length; - if (len <= MAX_ARGUMENTS_LENGTH) { - return String.fromCharCode.apply(String, codePoints) // avoid extra slice() - } + case 'utf8': + case 'utf-8': + return utf8Write(this, string, offset, length) - // Decode in chunks to avoid "call stack size exceeded". - var res = ''; - var i = 0; - while (i < len) { - res += String.fromCharCode.apply( - String, - codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH) - ); - } - return res - } + case 'ascii': + return asciiWrite(this, string, offset, length) - function asciiSlice (buf, start, end) { - var ret = ''; - end = Math.min(buf.length, end); + case 'latin1': + case 'binary': + return latin1Write(this, string, offset, length) - for (var i = start; i < end; ++i) { - ret += String.fromCharCode(buf[i] & 0x7F); - } - return ret - } + case 'base64': + // Warning: maxLength not taken into account in base64Write + return base64Write(this, string, offset, length) - function latin1Slice (buf, start, end) { - var ret = ''; - end = Math.min(buf.length, end); + case 'ucs2': + case 'ucs-2': + case 'utf16le': + case 'utf-16le': + return ucs2Write(this, string, offset, length) - for (var i = start; i < end; ++i) { - ret += String.fromCharCode(buf[i]); - } - return ret - } + default: + if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding) + encoding = ('' + encoding).toLowerCase(); + loweredCase = true; + } + } + }; - function hexSlice (buf, start, end) { - var len = buf.length; + Buffer.prototype.toJSON = function toJSON () { + return { + type: 'Buffer', + data: Array.prototype.slice.call(this._arr || this, 0) + } + }; - if (!start || start < 0) start = 0; - if (!end || end < 0 || end > len) end = len; + function base64Slice (buf, start, end) { + if (start === 0 && end === buf.length) { + return fromByteArray(buf) + } else { + return fromByteArray(buf.slice(start, end)) + } + } - var out = ''; - for (var i = start; i < end; ++i) { - out += toHex(buf[i]); - } - return out - } + function utf8Slice (buf, start, end) { + end = Math.min(buf.length, end); + var res = []; - function utf16leSlice (buf, start, end) { - var bytes = buf.slice(start, end); - var res = ''; - for (var i = 0; i < bytes.length; i += 2) { - res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256); - } - return res - } + var i = start; + while (i < end) { + var firstByte = buf[i]; + var codePoint = null; + var bytesPerSequence = (firstByte > 0xEF) ? 4 + : (firstByte > 0xDF) ? 3 + : (firstByte > 0xBF) ? 2 + : 1; - Buffer.prototype.slice = function slice (start, end) { - var len = this.length; - start = ~~start; - end = end === undefined ? len : ~~end; + if (i + bytesPerSequence <= end) { + var secondByte, thirdByte, fourthByte, tempCodePoint; - if (start < 0) { - start += len; - if (start < 0) start = 0; - } else if (start > len) { - start = len; - } + 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 (end < 0) { - end += len; - if (end < 0) end = 0; - } else if (end > len) { - end = len; - } + 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; + } - if (end < start) end = start; + res.push(codePoint); + i += bytesPerSequence; + } - var newBuf; - if (Buffer.TYPED_ARRAY_SUPPORT) { - newBuf = this.subarray(start, end); - newBuf.__proto__ = Buffer.prototype; - } else { - var sliceLen = end - start; - newBuf = new Buffer(sliceLen, undefined); - for (var i = 0; i < sliceLen; ++i) { - newBuf[i] = this[i + start]; + return decodeCodePointsArray(res) } - } - return newBuf - }; + // 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 + var MAX_ARGUMENTS_LENGTH = 0x1000; - /* - * 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') - } + function decodeCodePointsArray (codePoints) { + var len = codePoints.length; + if (len <= MAX_ARGUMENTS_LENGTH) { + return String.fromCharCode.apply(String, codePoints) // avoid extra slice() + } - Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) { - offset = offset | 0; - byteLength = byteLength | 0; - if (!noAssert) checkOffset(offset, byteLength, this.length); + // Decode in chunks to avoid "call stack size exceeded". + var res = ''; + var i = 0; + while (i < len) { + res += String.fromCharCode.apply( + String, + codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH) + ); + } + return res + } - var val = this[offset]; - var mul = 1; - var i = 0; - while (++i < byteLength && (mul *= 0x100)) { - val += this[offset + i] * mul; - } + function asciiSlice (buf, start, end) { + var ret = ''; + end = Math.min(buf.length, end); - return val - }; + for (var i = start; i < end; ++i) { + ret += String.fromCharCode(buf[i] & 0x7F); + } + return ret + } - Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) { - offset = offset | 0; - byteLength = byteLength | 0; - if (!noAssert) { - checkOffset(offset, byteLength, this.length); - } + function latin1Slice (buf, start, end) { + var ret = ''; + end = Math.min(buf.length, end); - var val = this[offset + --byteLength]; - var mul = 1; - while (byteLength > 0 && (mul *= 0x100)) { - val += this[offset + --byteLength] * mul; - } + for (var i = start; i < end; ++i) { + ret += String.fromCharCode(buf[i]); + } + return ret + } - return val - }; + function hexSlice (buf, start, end) { + var len = buf.length; - Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) { - if (!noAssert) checkOffset(offset, 1, this.length); - return this[offset] - }; + if (!start || start < 0) start = 0; + if (!end || end < 0 || end > len) end = len; - Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) { - if (!noAssert) checkOffset(offset, 2, this.length); - return this[offset] | (this[offset + 1] << 8) - }; + var out = ''; + for (var i = start; i < end; ++i) { + out += toHex(buf[i]); + } + return out + } - Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) { - if (!noAssert) checkOffset(offset, 2, this.length); - return (this[offset] << 8) | this[offset + 1] - }; + function utf16leSlice (buf, start, end) { + var bytes = buf.slice(start, end); + var res = ''; + for (var i = 0; i < bytes.length; i += 2) { + res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256); + } + return res + } - Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) { - if (!noAssert) checkOffset(offset, 4, this.length); + Buffer.prototype.slice = function slice (start, end) { + var len = this.length; + start = ~~start; + end = end === undefined ? len : ~~end; - return ((this[offset]) | - (this[offset + 1] << 8) | - (this[offset + 2] << 16)) + - (this[offset + 3] * 0x1000000) - }; + if (start < 0) { + start += len; + if (start < 0) start = 0; + } else if (start > len) { + start = len; + } - Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) { - if (!noAssert) checkOffset(offset, 4, this.length); + if (end < 0) { + end += len; + if (end < 0) end = 0; + } else if (end > len) { + end = len; + } - return (this[offset] * 0x1000000) + - ((this[offset + 1] << 16) | - (this[offset + 2] << 8) | - this[offset + 3]) - }; + if (end < start) end = start; - Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) { - offset = offset | 0; - byteLength = byteLength | 0; - if (!noAssert) checkOffset(offset, byteLength, this.length); + var newBuf; + if (Buffer.TYPED_ARRAY_SUPPORT) { + newBuf = this.subarray(start, end); + newBuf.__proto__ = Buffer.prototype; + } else { + var sliceLen = end - start; + newBuf = new Buffer(sliceLen, undefined); + for (var i = 0; i < sliceLen; ++i) { + newBuf[i] = this[i + start]; + } + } - var val = this[offset]; - var mul = 1; - var i = 0; - while (++i < byteLength && (mul *= 0x100)) { - val += this[offset + i] * mul; - } - mul *= 0x80; + return newBuf + }; - if (val >= mul) val -= Math.pow(2, 8 * byteLength); + /* + * 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') + } - return val - }; + Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) { + offset = offset | 0; + byteLength = byteLength | 0; + if (!noAssert) checkOffset(offset, byteLength, this.length); - Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) { - offset = offset | 0; - byteLength = byteLength | 0; - if (!noAssert) checkOffset(offset, byteLength, this.length); + var val = this[offset]; + var mul = 1; + var i = 0; + while (++i < byteLength && (mul *= 0x100)) { + val += this[offset + i] * mul; + } - var i = byteLength; - var mul = 1; - var val = this[offset + --i]; - while (i > 0 && (mul *= 0x100)) { - val += this[offset + --i] * mul; - } - mul *= 0x80; + return val + }; - if (val >= mul) val -= Math.pow(2, 8 * byteLength); + Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) { + offset = offset | 0; + byteLength = byteLength | 0; + if (!noAssert) { + checkOffset(offset, byteLength, this.length); + } - return val - }; + var val = this[offset + --byteLength]; + var mul = 1; + while (byteLength > 0 && (mul *= 0x100)) { + val += this[offset + --byteLength] * mul; + } - Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) { - if (!noAssert) checkOffset(offset, 1, this.length); - if (!(this[offset] & 0x80)) return (this[offset]) - return ((0xff - this[offset] + 1) * -1) - }; + return val + }; - Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) { - if (!noAssert) checkOffset(offset, 2, this.length); - var val = this[offset] | (this[offset + 1] << 8); - return (val & 0x8000) ? val | 0xFFFF0000 : val - }; + Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) { + if (!noAssert) checkOffset(offset, 1, this.length); + return this[offset] + }; - Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) { - if (!noAssert) checkOffset(offset, 2, this.length); - var val = this[offset + 1] | (this[offset] << 8); - return (val & 0x8000) ? val | 0xFFFF0000 : val - }; + Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) { + if (!noAssert) checkOffset(offset, 2, this.length); + return this[offset] | (this[offset + 1] << 8) + }; - Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) { - if (!noAssert) checkOffset(offset, 4, this.length); + Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) { + if (!noAssert) checkOffset(offset, 2, this.length); + return (this[offset] << 8) | this[offset + 1] + }; - return (this[offset]) | - (this[offset + 1] << 8) | - (this[offset + 2] << 16) | - (this[offset + 3] << 24) - }; + Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) { + if (!noAssert) checkOffset(offset, 4, this.length); - Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) { - if (!noAssert) checkOffset(offset, 4, this.length); + return ((this[offset]) | + (this[offset + 1] << 8) | + (this[offset + 2] << 16)) + + (this[offset + 3] * 0x1000000) + }; - return (this[offset] << 24) | - (this[offset + 1] << 16) | - (this[offset + 2] << 8) | - (this[offset + 3]) - }; + Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) { + if (!noAssert) checkOffset(offset, 4, this.length); - Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) { - if (!noAssert) checkOffset(offset, 4, this.length); - return read(this, offset, true, 23, 4) - }; + return (this[offset] * 0x1000000) + + ((this[offset + 1] << 16) | + (this[offset + 2] << 8) | + this[offset + 3]) + }; - Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) { - if (!noAssert) checkOffset(offset, 4, this.length); - return read(this, offset, false, 23, 4) - }; + Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) { + offset = offset | 0; + byteLength = byteLength | 0; + if (!noAssert) checkOffset(offset, byteLength, this.length); - Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) { - if (!noAssert) checkOffset(offset, 8, this.length); - return read(this, offset, true, 52, 8) - }; + var val = this[offset]; + var mul = 1; + var i = 0; + while (++i < byteLength && (mul *= 0x100)) { + val += this[offset + i] * mul; + } + mul *= 0x80; - Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) { - if (!noAssert) checkOffset(offset, 8, this.length); - return read(this, offset, false, 52, 8) - }; + if (val >= mul) val -= Math.pow(2, 8 * byteLength); - function checkInt (buf, value, offset, ext, max, min) { - if (!internalIsBuffer(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') - } + return val + }; - Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) { - value = +value; - offset = offset | 0; - byteLength = byteLength | 0; - if (!noAssert) { - var maxBytes = Math.pow(2, 8 * byteLength) - 1; - checkInt(this, value, offset, byteLength, maxBytes, 0); - } + Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) { + offset = offset | 0; + byteLength = byteLength | 0; + if (!noAssert) checkOffset(offset, byteLength, this.length); - var mul = 1; - var i = 0; - this[offset] = value & 0xFF; - while (++i < byteLength && (mul *= 0x100)) { - this[offset + i] = (value / mul) & 0xFF; - } + var i = byteLength; + var mul = 1; + var val = this[offset + --i]; + while (i > 0 && (mul *= 0x100)) { + val += this[offset + --i] * mul; + } + mul *= 0x80; - return offset + byteLength - }; + if (val >= mul) val -= Math.pow(2, 8 * byteLength); - Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) { - value = +value; - offset = offset | 0; - byteLength = byteLength | 0; - if (!noAssert) { - var maxBytes = Math.pow(2, 8 * byteLength) - 1; - checkInt(this, value, offset, byteLength, maxBytes, 0); - } + return val + }; - var i = byteLength - 1; - var mul = 1; - this[offset + i] = value & 0xFF; - while (--i >= 0 && (mul *= 0x100)) { - this[offset + i] = (value / mul) & 0xFF; - } + Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) { + if (!noAssert) checkOffset(offset, 1, this.length); + if (!(this[offset] & 0x80)) return (this[offset]) + return ((0xff - this[offset] + 1) * -1) + }; - return offset + byteLength - }; + Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) { + if (!noAssert) checkOffset(offset, 2, this.length); + var val = this[offset] | (this[offset + 1] << 8); + return (val & 0x8000) ? val | 0xFFFF0000 : val + }; - Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0); - if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value); - this[offset] = (value & 0xff); - return offset + 1 - }; + Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) { + if (!noAssert) checkOffset(offset, 2, this.length); + var val = this[offset + 1] | (this[offset] << 8); + return (val & 0x8000) ? val | 0xFFFF0000 : val + }; - function objectWriteUInt16 (buf, value, offset, littleEndian) { - if (value < 0) value = 0xffff + value + 1; - for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; ++i) { - buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>> - (littleEndian ? i : 1 - i) * 8; - } - } + Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) { + if (!noAssert) checkOffset(offset, 4, this.length); - Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0); - if (Buffer.TYPED_ARRAY_SUPPORT) { - this[offset] = (value & 0xff); - this[offset + 1] = (value >>> 8); - } else { - objectWriteUInt16(this, value, offset, true); - } - return offset + 2 - }; + return (this[offset]) | + (this[offset + 1] << 8) | + (this[offset + 2] << 16) | + (this[offset + 3] << 24) + }; - Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0); - if (Buffer.TYPED_ARRAY_SUPPORT) { - this[offset] = (value >>> 8); - this[offset + 1] = (value & 0xff); - } else { - objectWriteUInt16(this, value, offset, false); - } - return offset + 2 - }; + Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) { + if (!noAssert) checkOffset(offset, 4, this.length); - function objectWriteUInt32 (buf, value, offset, littleEndian) { - if (value < 0) value = 0xffffffff + value + 1; - for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; ++i) { - buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff; - } - } + return (this[offset] << 24) | + (this[offset + 1] << 16) | + (this[offset + 2] << 8) | + (this[offset + 3]) + }; - Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0); - if (Buffer.TYPED_ARRAY_SUPPORT) { - this[offset + 3] = (value >>> 24); - this[offset + 2] = (value >>> 16); - this[offset + 1] = (value >>> 8); - this[offset] = (value & 0xff); - } else { - objectWriteUInt32(this, value, offset, true); - } - return offset + 4 - }; + Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) { + if (!noAssert) checkOffset(offset, 4, this.length); + return read(this, offset, true, 23, 4) + }; - Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0); - if (Buffer.TYPED_ARRAY_SUPPORT) { - this[offset] = (value >>> 24); - this[offset + 1] = (value >>> 16); - this[offset + 2] = (value >>> 8); - this[offset + 3] = (value & 0xff); - } else { - objectWriteUInt32(this, value, offset, false); - } - return offset + 4 - }; + Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) { + if (!noAssert) checkOffset(offset, 4, this.length); + return read(this, offset, false, 23, 4) + }; - Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) { - var limit = Math.pow(2, 8 * byteLength - 1); + Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) { + if (!noAssert) checkOffset(offset, 8, this.length); + return read(this, offset, true, 52, 8) + }; - checkInt(this, value, offset, byteLength, limit - 1, -limit); - } + Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) { + if (!noAssert) checkOffset(offset, 8, this.length); + return read(this, offset, false, 52, 8) + }; - var i = 0; - var mul = 1; - var sub = 0; - this[offset] = value & 0xFF; - while (++i < byteLength && (mul *= 0x100)) { - if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) { - sub = 1; + function checkInt (buf, value, offset, ext, max, min) { + if (!internalIsBuffer(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') } - this[offset + i] = ((value / mul) >> 0) - sub & 0xFF; - } - return offset + byteLength - }; + Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) { + value = +value; + offset = offset | 0; + byteLength = byteLength | 0; + if (!noAssert) { + var maxBytes = Math.pow(2, 8 * byteLength) - 1; + checkInt(this, value, offset, byteLength, maxBytes, 0); + } - Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) { - var limit = Math.pow(2, 8 * byteLength - 1); + var mul = 1; + var i = 0; + this[offset] = value & 0xFF; + while (++i < byteLength && (mul *= 0x100)) { + this[offset + i] = (value / mul) & 0xFF; + } - checkInt(this, value, offset, byteLength, limit - 1, -limit); - } + return offset + byteLength + }; - var i = byteLength - 1; - var mul = 1; - var 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; - } + Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) { + value = +value; + offset = offset | 0; + byteLength = byteLength | 0; + if (!noAssert) { + var maxBytes = Math.pow(2, 8 * byteLength) - 1; + checkInt(this, value, offset, byteLength, maxBytes, 0); + } - return offset + byteLength - }; + var i = byteLength - 1; + var mul = 1; + this[offset + i] = value & 0xFF; + while (--i >= 0 && (mul *= 0x100)) { + this[offset + i] = (value / mul) & 0xFF; + } - Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80); - if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value); - if (value < 0) value = 0xff + value + 1; - this[offset] = (value & 0xff); - return offset + 1 - }; + return offset + byteLength + }; - Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000); - if (Buffer.TYPED_ARRAY_SUPPORT) { - this[offset] = (value & 0xff); - this[offset + 1] = (value >>> 8); - } else { - objectWriteUInt16(this, value, offset, true); - } - return offset + 2 - }; + Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0); + if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value); + this[offset] = (value & 0xff); + return offset + 1 + }; - Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000); - if (Buffer.TYPED_ARRAY_SUPPORT) { - this[offset] = (value >>> 8); - this[offset + 1] = (value & 0xff); - } else { - objectWriteUInt16(this, value, offset, false); - } - return offset + 2 - }; + function objectWriteUInt16 (buf, value, offset, littleEndian) { + if (value < 0) value = 0xffff + value + 1; + for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; ++i) { + buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>> + (littleEndian ? i : 1 - i) * 8; + } + } - Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000); - if (Buffer.TYPED_ARRAY_SUPPORT) { - this[offset] = (value & 0xff); - this[offset + 1] = (value >>> 8); - this[offset + 2] = (value >>> 16); - this[offset + 3] = (value >>> 24); - } else { - objectWriteUInt32(this, value, offset, true); - } - return offset + 4 - }; + Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0); + if (Buffer.TYPED_ARRAY_SUPPORT) { + this[offset] = (value & 0xff); + this[offset + 1] = (value >>> 8); + } else { + objectWriteUInt16(this, value, offset, true); + } + return offset + 2 + }; - 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; - if (Buffer.TYPED_ARRAY_SUPPORT) { - this[offset] = (value >>> 24); - this[offset + 1] = (value >>> 16); - this[offset + 2] = (value >>> 8); - this[offset + 3] = (value & 0xff); - } else { - objectWriteUInt32(this, value, offset, false); - } - return offset + 4 - }; + Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0); + if (Buffer.TYPED_ARRAY_SUPPORT) { + this[offset] = (value >>> 8); + this[offset + 1] = (value & 0xff); + } else { + objectWriteUInt16(this, value, offset, false); + } + return offset + 2 + }; - 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 objectWriteUInt32 (buf, value, offset, littleEndian) { + if (value < 0) value = 0xffffffff + value + 1; + for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; ++i) { + buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff; + } + } - function writeFloat (buf, value, offset, littleEndian, noAssert) { - if (!noAssert) { - checkIEEE754(buf, value, offset, 4); - } - write(buf, value, offset, littleEndian, 23, 4); - return offset + 4 - } + Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0); + if (Buffer.TYPED_ARRAY_SUPPORT) { + this[offset + 3] = (value >>> 24); + this[offset + 2] = (value >>> 16); + this[offset + 1] = (value >>> 8); + this[offset] = (value & 0xff); + } else { + objectWriteUInt32(this, value, offset, true); + } + return offset + 4 + }; - Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) { - return writeFloat(this, value, offset, true, noAssert) - }; + Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0); + if (Buffer.TYPED_ARRAY_SUPPORT) { + this[offset] = (value >>> 24); + this[offset + 1] = (value >>> 16); + this[offset + 2] = (value >>> 8); + this[offset + 3] = (value & 0xff); + } else { + objectWriteUInt32(this, value, offset, false); + } + return offset + 4 + }; - Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) { - return writeFloat(this, value, offset, false, noAssert) - }; + Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) { + var limit = Math.pow(2, 8 * byteLength - 1); - function writeDouble (buf, value, offset, littleEndian, noAssert) { - if (!noAssert) { - checkIEEE754(buf, value, offset, 8); - } - write(buf, value, offset, littleEndian, 52, 8); - return offset + 8 - } + checkInt(this, value, offset, byteLength, limit - 1, -limit); + } - Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) { - return writeDouble(this, value, offset, true, noAssert) - }; + var i = 0; + var mul = 1; + var 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; + } - Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) { - return writeDouble(this, value, offset, false, noAssert) - }; + return offset + byteLength + }; - // copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length) - Buffer.prototype.copy = function copy (target, targetStart, start, end) { - 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('sourceStart out of bounds') - if (end < 0) throw new RangeError('sourceEnd out of bounds') + Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) { + var limit = Math.pow(2, 8 * byteLength - 1); - // Are we oob? - if (end > this.length) end = this.length; - if (target.length - targetStart < end - start) { - end = target.length - targetStart + start; - } + checkInt(this, value, offset, byteLength, limit - 1, -limit); + } - var len = end - start; - var i; - - if (this === target && start < targetStart && targetStart < end) { - // descending copy from end - for (i = len - 1; i >= 0; --i) { - target[i + targetStart] = this[i + start]; - } - } else if (len < 1000 || !Buffer.TYPED_ARRAY_SUPPORT) { - // ascending copy from start - for (i = 0; i < len; ++i) { - target[i + targetStart] = this[i + start]; - } - } else { - Uint8Array.prototype.set.call( - target, - this.subarray(start, start + len), - targetStart - ); - } + var i = byteLength - 1; + var mul = 1; + var 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 len - }; + return offset + byteLength + }; - // 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 (val.length === 1) { - var code = val.charCodeAt(0); - if (code < 256) { - val = code; - } - } - 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) - } - } else if (typeof val === 'number') { - val = val & 255; - } + Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80); + if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value); + if (value < 0) value = 0xff + value + 1; + this[offset] = (value & 0xff); + return offset + 1 + }; - // 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') - } + Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000); + if (Buffer.TYPED_ARRAY_SUPPORT) { + this[offset] = (value & 0xff); + this[offset + 1] = (value >>> 8); + } else { + objectWriteUInt16(this, value, offset, true); + } + return offset + 2 + }; - if (end <= start) { - return this - } + Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000); + if (Buffer.TYPED_ARRAY_SUPPORT) { + this[offset] = (value >>> 8); + this[offset + 1] = (value & 0xff); + } else { + objectWriteUInt16(this, value, offset, false); + } + return offset + 2 + }; - start = start >>> 0; - end = end === undefined ? this.length : end >>> 0; + Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000); + if (Buffer.TYPED_ARRAY_SUPPORT) { + this[offset] = (value & 0xff); + this[offset + 1] = (value >>> 8); + this[offset + 2] = (value >>> 16); + this[offset + 3] = (value >>> 24); + } else { + objectWriteUInt32(this, value, offset, true); + } + return offset + 4 + }; - if (!val) val = 0; + 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; + if (Buffer.TYPED_ARRAY_SUPPORT) { + this[offset] = (value >>> 24); + this[offset + 1] = (value >>> 16); + this[offset + 2] = (value >>> 8); + this[offset + 3] = (value & 0xff); + } else { + objectWriteUInt32(this, value, offset, false); + } + return offset + 4 + }; - var i; - if (typeof val === 'number') { - for (i = start; i < end; ++i) { - this[i] = val; + 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') } - } else { - var bytes = internalIsBuffer(val) - ? val - : utf8ToBytes(new Buffer(val, encoding).toString()); - var len = bytes.length; - for (i = 0; i < end - start; ++i) { - this[i + start] = bytes[i % len]; + + function writeFloat (buf, value, offset, littleEndian, noAssert) { + if (!noAssert) { + checkIEEE754(buf, value, offset, 4); + } + write(buf, value, offset, littleEndian, 23, 4); + return offset + 4 } - } - return this - }; + Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) { + return writeFloat(this, value, offset, true, noAssert) + }; - // HELPER FUNCTIONS - // ================ + Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) { + return writeFloat(this, value, offset, false, noAssert) + }; - var INVALID_BASE64_RE = /[^+\/0-9A-Za-z-_]/g; + function writeDouble (buf, value, offset, littleEndian, noAssert) { + if (!noAssert) { + checkIEEE754(buf, value, offset, 8); + } + write(buf, value, offset, littleEndian, 52, 8); + return offset + 8 + } - function base64clean (str) { - // Node strips out invalid characters like \n and \t from the string, base64-js does not - str = stringtrim(str).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 - } + Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) { + return writeDouble(this, value, offset, true, noAssert) + }; - function stringtrim (str) { - if (str.trim) return str.trim() - return str.replace(/^\s+|\s+$/g, '') - } + Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) { + return writeDouble(this, value, offset, false, noAssert) + }; - function toHex (n) { - if (n < 16) return '0' + n.toString(16) - return n.toString(16) - } + // copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length) + Buffer.prototype.copy = function copy (target, targetStart, start, end) { + 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('sourceStart out of bounds') + if (end < 0) throw new RangeError('sourceEnd out of bounds') - function utf8ToBytes (string, units) { - units = units || Infinity; - var codePoint; - var length = string.length; - var leadSurrogate = null; - var bytes = []; - - for (var 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 + // Are we oob? + if (end > this.length) end = this.length; + if (target.length - targetStart < end - start) { + end = target.length - targetStart + start; + } + + var len = end - start; + var i; + + if (this === target && start < targetStart && targetStart < end) { + // descending copy from end + for (i = len - 1; i >= 0; --i) { + target[i + targetStart] = this[i + start]; + } + } else if (len < 1000 || !Buffer.TYPED_ARRAY_SUPPORT) { + // ascending copy from start + for (i = 0; i < len; ++i) { + target[i + targetStart] = this[i + start]; } + } else { + Uint8Array.prototype.set.call( + target, + this.subarray(start, start + len), + targetStart + ); + } - // valid lead - leadSurrogate = codePoint; + return len + }; - continue + // 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 (val.length === 1) { + var code = val.charCodeAt(0); + if (code < 256) { + val = code; + } + } + 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) + } + } else if (typeof val === 'number') { + val = val & 255; } - // 2 leads in a row - if (codePoint < 0xDC00) { - if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD); - leadSurrogate = codePoint; - continue + // 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') } - // 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); - } + if (end <= start) { + return this + } - leadSurrogate = null; + start = start >>> 0; + end = end === undefined ? this.length : end >>> 0; - // 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') - } - } + if (!val) val = 0; - return bytes - } + var i; + if (typeof val === 'number') { + for (i = start; i < end; ++i) { + this[i] = val; + } + } else { + var bytes = internalIsBuffer(val) + ? val + : utf8ToBytes(new Buffer(val, encoding).toString()); + var len = bytes.length; + for (i = 0; i < end - start; ++i) { + this[i + start] = bytes[i % len]; + } + } - function asciiToBytes (str) { - var byteArray = []; - for (var 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 - } + return this + }; - function utf16leToBytes (str, units) { - var c, hi, lo; - var byteArray = []; - for (var 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); - } + // HELPER FUNCTIONS + // ================ - return byteArray - } + var INVALID_BASE64_RE = /[^+\/0-9A-Za-z-_]/g; + function base64clean (str) { + // Node strips out invalid characters like \n and \t from the string, base64-js does not + str = stringtrim(str).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 stringtrim (str) { + if (str.trim) return str.trim() + return str.replace(/^\s+|\s+$/g, '') + } + + function toHex (n) { + if (n < 16) return '0' + n.toString(16) + return n.toString(16) + } + + function utf8ToBytes (string, units) { + units = units || Infinity; + var codePoint; + var length = string.length; + var leadSurrogate = null; + var bytes = []; + + for (var 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 + } - function base64ToBytes (str) { - return toByteArray(base64clean(str)) - } + // valid lead + leadSurrogate = codePoint; - function blitBuffer (src, dst, offset, length) { - for (var i = 0; i < length; ++i) { - if ((i + offset >= dst.length) || (i >= src.length)) break - dst[i + offset] = src[i]; - } - return i - } + continue + } - function isnan (val) { - return val !== val // eslint-disable-line no-self-compare - } + // 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); + } - // the following is from is-buffer, also by Feross Aboukhadijeh and with same lisence - // The _isBuffer check is for Safari 5-7 support, because it's missing - // Object.prototype.constructor. Remove this eventually - function isBuffer(obj) { - return obj != null && (!!obj._isBuffer || isFastBuffer(obj) || isSlowBuffer(obj)) - } + 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') + } + } - function isFastBuffer (obj) { - return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj) - } + return bytes + } - // For Node v0.10 support. Remove this eventually. - function isSlowBuffer (obj) { - return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isFastBuffer(obj.slice(0, 0)) - } + function asciiToBytes (str) { + var byteArray = []; + for (var 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 + } - var domain; + function utf16leToBytes (str, units) { + var c, hi, lo; + var byteArray = []; + for (var i = 0; i < str.length; ++i) { + if ((units -= 2) < 0) break - // This constructor is used to store event handlers. Instantiating this is - // faster than explicitly calling `Object.create(null)` to get a "clean" empty - // object (tested with v8 v4.9). - function EventHandlers() {} - EventHandlers.prototype = Object.create(null); + c = str.charCodeAt(i); + hi = c >> 8; + lo = c % 256; + byteArray.push(lo); + byteArray.push(hi); + } - function EventEmitter() { - EventEmitter.init.call(this); - } + return byteArray + } - // nodejs oddity - // require('events') === require('events').EventEmitter - EventEmitter.EventEmitter = EventEmitter; - EventEmitter.usingDomains = false; + function base64ToBytes (str) { + return toByteArray(base64clean(str)) + } - EventEmitter.prototype.domain = undefined; - EventEmitter.prototype._events = undefined; - EventEmitter.prototype._maxListeners = undefined; + function blitBuffer (src, dst, offset, length) { + for (var i = 0; i < length; ++i) { + if ((i + offset >= dst.length) || (i >= src.length)) break + dst[i + offset] = src[i]; + } + return i + } - // By default EventEmitters will print a warning if more than 10 listeners are - // added to it. This is a useful default which helps finding memory leaks. - EventEmitter.defaultMaxListeners = 10; + function isnan (val) { + return val !== val // eslint-disable-line no-self-compare + } - EventEmitter.init = function() { - this.domain = null; - if (EventEmitter.usingDomains) { - // if there is an active domain, then attach to it. - if (domain.active && !(this instanceof domain.Domain)) ; - } - if (!this._events || this._events === Object.getPrototypeOf(this)._events) { - this._events = new EventHandlers(); - this._eventsCount = 0; - } + // the following is from is-buffer, also by Feross Aboukhadijeh and with same lisence + // The _isBuffer check is for Safari 5-7 support, because it's missing + // Object.prototype.constructor. Remove this eventually + function isBuffer(obj) { + return obj != null && (!!obj._isBuffer || isFastBuffer(obj) || isSlowBuffer(obj)) + } - this._maxListeners = this._maxListeners || undefined; - }; + function isFastBuffer (obj) { + return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj) + } - // Obviously not all Emitters should be limited to 10. This function allows - // that to be increased. Set to zero for unlimited. - EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) { - if (typeof n !== 'number' || n < 0 || isNaN(n)) - throw new TypeError('"n" argument must be a positive number'); - this._maxListeners = n; - return this; - }; + // For Node v0.10 support. Remove this eventually. + function isSlowBuffer (obj) { + return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isFastBuffer(obj.slice(0, 0)) + } - function $getMaxListeners(that) { - if (that._maxListeners === undefined) - return EventEmitter.defaultMaxListeners; - return that._maxListeners; - } + var domain; - EventEmitter.prototype.getMaxListeners = function getMaxListeners() { - return $getMaxListeners(this); - }; + // This constructor is used to store event handlers. Instantiating this is + // faster than explicitly calling `Object.create(null)` to get a "clean" empty + // object (tested with v8 v4.9). + function EventHandlers() {} + EventHandlers.prototype = Object.create(null); - // These standalone emit* functions are used to optimize calling of event - // handlers for fast cases because emit() itself often has a variable number of - // arguments and can be deoptimized because of that. These functions always have - // the same number of arguments and thus do not get deoptimized, so the code - // inside them can execute faster. - function emitNone(handler, isFn, self) { - if (isFn) - handler.call(self); - else { - var len = handler.length; - var listeners = arrayClone(handler, len); - for (var i = 0; i < len; ++i) - listeners[i].call(self); - } - } - function emitOne(handler, isFn, self, arg1) { - if (isFn) - handler.call(self, arg1); - else { - var len = handler.length; - var listeners = arrayClone(handler, len); - for (var i = 0; i < len; ++i) - listeners[i].call(self, arg1); - } - } - function emitTwo(handler, isFn, self, arg1, arg2) { - if (isFn) - handler.call(self, arg1, arg2); - else { - var len = handler.length; - var listeners = arrayClone(handler, len); - for (var i = 0; i < len; ++i) - listeners[i].call(self, arg1, arg2); - } - } - function emitThree(handler, isFn, self, arg1, arg2, arg3) { - if (isFn) - handler.call(self, arg1, arg2, arg3); - else { - var len = handler.length; - var listeners = arrayClone(handler, len); - for (var i = 0; i < len; ++i) - listeners[i].call(self, arg1, arg2, arg3); - } - } + function EventEmitter() { + EventEmitter.init.call(this); + } - function emitMany(handler, isFn, self, args) { - if (isFn) - handler.apply(self, args); - else { - var len = handler.length; - var listeners = arrayClone(handler, len); - for (var i = 0; i < len; ++i) - listeners[i].apply(self, args); - } - } + // nodejs oddity + // require('events') === require('events').EventEmitter + EventEmitter.EventEmitter = EventEmitter; - EventEmitter.prototype.emit = function emit(type) { - var er, handler, len, args, i, events, domain; - var doError = (type === 'error'); - - events = this._events; - if (events) - doError = (doError && events.error == null); - else if (!doError) - return false; - - domain = this.domain; - - // If there is no 'error' event listener then throw. - if (doError) { - er = arguments[1]; - if (domain) { - if (!er) - er = new Error('Uncaught, unspecified "error" event'); - er.domainEmitter = this; - er.domain = domain; - er.domainThrown = false; - domain.emit('error', er); - } else if (er instanceof Error) { - throw er; // Unhandled 'error' event - } else { - // At least give some kind of context to the user - var err = new Error('Uncaught, unspecified "error" event. (' + er + ')'); - err.context = er; - throw err; - } - return false; - } + EventEmitter.usingDomains = false; - handler = events[type]; - - if (!handler) - return false; - - var isFn = typeof handler === 'function'; - len = arguments.length; - switch (len) { - // fast cases - case 1: - emitNone(handler, isFn, this); - break; - case 2: - emitOne(handler, isFn, this, arguments[1]); - break; - case 3: - emitTwo(handler, isFn, this, arguments[1], arguments[2]); - break; - case 4: - emitThree(handler, isFn, this, arguments[1], arguments[2], arguments[3]); - break; - // slower - default: - args = new Array(len - 1); - for (i = 1; i < len; i++) - args[i - 1] = arguments[i]; - emitMany(handler, isFn, this, args); - } + EventEmitter.prototype.domain = undefined; + EventEmitter.prototype._events = undefined; + EventEmitter.prototype._maxListeners = undefined; - return true; - }; + // By default EventEmitters will print a warning if more than 10 listeners are + // added to it. This is a useful default which helps finding memory leaks. + EventEmitter.defaultMaxListeners = 10; - function _addListener(target, type, listener, prepend) { - var m; - var events; - var existing; - - if (typeof listener !== 'function') - throw new TypeError('"listener" argument must be a function'); - - events = target._events; - if (!events) { - events = target._events = new EventHandlers(); - target._eventsCount = 0; - } else { - // To avoid recursion in the case that type === "newListener"! Before - // adding it to the listeners, first emit "newListener". - if (events.newListener) { - target.emit('newListener', type, - listener.listener ? listener.listener : listener); - - // Re-assign `events` because a newListener handler could have caused the - // this._events to be assigned to a new object - events = target._events; + EventEmitter.init = function() { + this.domain = null; + if (EventEmitter.usingDomains) { + // if there is an active domain, then attach to it. + if (domain.active && !(this instanceof domain.Domain)) ; + } + + if (!this._events || this._events === Object.getPrototypeOf(this)._events) { + this._events = new EventHandlers(); + this._eventsCount = 0; + } + + this._maxListeners = this._maxListeners || undefined; + }; + + // Obviously not all Emitters should be limited to 10. This function allows + // that to be increased. Set to zero for unlimited. + EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) { + if (typeof n !== 'number' || n < 0 || isNaN(n)) + throw new TypeError('"n" argument must be a positive number'); + this._maxListeners = n; + return this; + }; + + function $getMaxListeners(that) { + if (that._maxListeners === undefined) + return EventEmitter.defaultMaxListeners; + return that._maxListeners; } - existing = events[type]; - } - if (!existing) { - // Optimize the case of one listener. Don't need the extra array object. - existing = events[type] = listener; - ++target._eventsCount; - } else { - if (typeof existing === 'function') { - // Adding the second element, need to change to array. - existing = events[type] = prepend ? [listener, existing] : - [existing, listener]; - } else { - // If we've already got an array, just append. - if (prepend) { - existing.unshift(listener); - } else { - existing.push(listener); + EventEmitter.prototype.getMaxListeners = function getMaxListeners() { + return $getMaxListeners(this); + }; + + // These standalone emit* functions are used to optimize calling of event + // handlers for fast cases because emit() itself often has a variable number of + // arguments and can be deoptimized because of that. These functions always have + // the same number of arguments and thus do not get deoptimized, so the code + // inside them can execute faster. + function emitNone(handler, isFn, self) { + if (isFn) + handler.call(self); + else { + var len = handler.length; + var listeners = arrayClone(handler, len); + for (var i = 0; i < len; ++i) + listeners[i].call(self); + } + } + function emitOne(handler, isFn, self, arg1) { + if (isFn) + handler.call(self, arg1); + else { + var len = handler.length; + var listeners = arrayClone(handler, len); + for (var i = 0; i < len; ++i) + listeners[i].call(self, arg1); + } + } + function emitTwo(handler, isFn, self, arg1, arg2) { + if (isFn) + handler.call(self, arg1, arg2); + else { + var len = handler.length; + var listeners = arrayClone(handler, len); + for (var i = 0; i < len; ++i) + listeners[i].call(self, arg1, arg2); + } + } + function emitThree(handler, isFn, self, arg1, arg2, arg3) { + if (isFn) + handler.call(self, arg1, arg2, arg3); + else { + var len = handler.length; + var listeners = arrayClone(handler, len); + for (var i = 0; i < len; ++i) + listeners[i].call(self, arg1, arg2, arg3); } } - // Check for listener leak - if (!existing.warned) { - m = $getMaxListeners(target); - if (m && m > 0 && existing.length > m) { - existing.warned = true; - var w = new Error('Possible EventEmitter memory leak detected. ' + - existing.length + ' ' + type + ' listeners added. ' + - 'Use emitter.setMaxListeners() to increase limit'); - w.name = 'MaxListenersExceededWarning'; - w.emitter = target; - w.type = type; - w.count = existing.length; - emitWarning(w); + function emitMany(handler, isFn, self, args) { + if (isFn) + handler.apply(self, args); + else { + var len = handler.length; + var listeners = arrayClone(handler, len); + for (var i = 0; i < len; ++i) + listeners[i].apply(self, args); } } - } - return target; - } - function emitWarning(e) { - typeof console.warn === 'function' ? console.warn(e) : console.log(e); - } - EventEmitter.prototype.addListener = function addListener(type, listener) { - return _addListener(this, type, listener, false); - }; + EventEmitter.prototype.emit = function emit(type) { + var er, handler, len, args, i, events, domain; + var doError = (type === 'error'); - EventEmitter.prototype.on = EventEmitter.prototype.addListener; + events = this._events; + if (events) + doError = (doError && events.error == null); + else if (!doError) + return false; + + domain = this.domain; + + // If there is no 'error' event listener then throw. + if (doError) { + er = arguments[1]; + if (domain) { + if (!er) + er = new Error('Uncaught, unspecified "error" event'); + er.domainEmitter = this; + er.domain = domain; + er.domainThrown = false; + domain.emit('error', er); + } else if (er instanceof Error) { + throw er; // Unhandled 'error' event + } else { + // At least give some kind of context to the user + var err = new Error('Uncaught, unspecified "error" event. (' + er + ')'); + err.context = er; + throw err; + } + return false; + } - EventEmitter.prototype.prependListener = - function prependListener(type, listener) { - return _addListener(this, type, listener, true); - }; + handler = events[type]; - function _onceWrap(target, type, listener) { - var fired = false; - function g() { - target.removeListener(type, g); - if (!fired) { - fired = true; - listener.apply(target, arguments); - } - } - g.listener = listener; - return g; - } + if (!handler) + return false; - EventEmitter.prototype.once = function once(type, listener) { - if (typeof listener !== 'function') - throw new TypeError('"listener" argument must be a function'); - this.on(type, _onceWrap(this, type, listener)); - return this; - }; + var isFn = typeof handler === 'function'; + len = arguments.length; + switch (len) { + // fast cases + case 1: + emitNone(handler, isFn, this); + break; + case 2: + emitOne(handler, isFn, this, arguments[1]); + break; + case 3: + emitTwo(handler, isFn, this, arguments[1], arguments[2]); + break; + case 4: + emitThree(handler, isFn, this, arguments[1], arguments[2], arguments[3]); + break; + // slower + default: + args = new Array(len - 1); + for (i = 1; i < len; i++) + args[i - 1] = arguments[i]; + emitMany(handler, isFn, this, args); + } - EventEmitter.prototype.prependOnceListener = - function prependOnceListener(type, listener) { - if (typeof listener !== 'function') - throw new TypeError('"listener" argument must be a function'); - this.prependListener(type, _onceWrap(this, type, listener)); - return this; + return true; }; - // emits a 'removeListener' event iff the listener was removed - EventEmitter.prototype.removeListener = - function removeListener(type, listener) { - var list, events, position, i, originalListener; + function _addListener(target, type, listener, prepend) { + var m; + var events; + var existing; if (typeof listener !== 'function') throw new TypeError('"listener" argument must be a function'); - events = this._events; - if (!events) - return this; - - list = events[type]; - if (!list) - return this; - - if (list === listener || (list.listener && list.listener === listener)) { - if (--this._eventsCount === 0) - this._events = new EventHandlers(); - else { - delete events[type]; - if (events.removeListener) - this.emit('removeListener', type, list.listener || listener); - } - } else if (typeof list !== 'function') { - position = -1; - - for (i = list.length; i-- > 0;) { - if (list[i] === listener || - (list[i].listener && list[i].listener === listener)) { - originalListener = list[i].listener; - position = i; - break; - } + events = target._events; + if (!events) { + events = target._events = new EventHandlers(); + target._eventsCount = 0; + } else { + // To avoid recursion in the case that type === "newListener"! Before + // adding it to the listeners, first emit "newListener". + if (events.newListener) { + target.emit('newListener', type, + listener.listener ? listener.listener : listener); + + // Re-assign `events` because a newListener handler could have caused the + // this._events to be assigned to a new object + events = target._events; } + existing = events[type]; + } - if (position < 0) - return this; - - if (list.length === 1) { - list[0] = undefined; - if (--this._eventsCount === 0) { - this._events = new EventHandlers(); - return this; + if (!existing) { + // Optimize the case of one listener. Don't need the extra array object. + existing = events[type] = listener; + ++target._eventsCount; + } else { + if (typeof existing === 'function') { + // Adding the second element, need to change to array. + existing = events[type] = prepend ? [listener, existing] : + [existing, listener]; + } else { + // If we've already got an array, just append. + if (prepend) { + existing.unshift(listener); } else { - delete events[type]; + existing.push(listener); } - } else { - spliceOne(list, position); } - if (events.removeListener) - this.emit('removeListener', type, originalListener || listener); + // Check for listener leak + if (!existing.warned) { + m = $getMaxListeners(target); + if (m && m > 0 && existing.length > m) { + existing.warned = true; + var w = new Error('Possible EventEmitter memory leak detected. ' + + existing.length + ' ' + type + ' listeners added. ' + + 'Use emitter.setMaxListeners() to increase limit'); + w.name = 'MaxListenersExceededWarning'; + w.emitter = target; + w.type = type; + w.count = existing.length; + emitWarning(w); + } + } } - return this; + return target; + } + function emitWarning(e) { + typeof console.warn === 'function' ? console.warn(e) : console.log(e); + } + EventEmitter.prototype.addListener = function addListener(type, listener) { + return _addListener(this, type, listener, false); }; - EventEmitter.prototype.removeAllListeners = - function removeAllListeners(type) { - var listeners, events; - - events = this._events; - if (!events) - return this; + EventEmitter.prototype.on = EventEmitter.prototype.addListener; - // not listening for removeListener, no need to emit - if (!events.removeListener) { - if (arguments.length === 0) { - this._events = new EventHandlers(); - this._eventsCount = 0; - } else if (events[type]) { - if (--this._eventsCount === 0) - this._events = new EventHandlers(); - else - delete events[type]; - } - return this; - } + EventEmitter.prototype.prependListener = + function prependListener(type, listener) { + return _addListener(this, type, listener, true); + }; - // emit removeListener for all listeners on all events - if (arguments.length === 0) { - var keys = Object.keys(events); - for (var i = 0, key; i < keys.length; ++i) { - key = keys[i]; - if (key === 'removeListener') continue; - this.removeAllListeners(key); + function _onceWrap(target, type, listener) { + var fired = false; + function g() { + target.removeListener(type, g); + if (!fired) { + fired = true; + listener.apply(target, arguments); } - this.removeAllListeners('removeListener'); - this._events = new EventHandlers(); - this._eventsCount = 0; - return this; - } - - listeners = events[type]; - - if (typeof listeners === 'function') { - this.removeListener(type, listeners); - } else if (listeners) { - // LIFO order - do { - this.removeListener(type, listeners[listeners.length - 1]); - } while (listeners[0]); } + g.listener = listener; + return g; + } + EventEmitter.prototype.once = function once(type, listener) { + if (typeof listener !== 'function') + throw new TypeError('"listener" argument must be a function'); + this.on(type, _onceWrap(this, type, listener)); return this; }; - EventEmitter.prototype.listeners = function listeners(type) { - var evlistener; - var ret; - var events = this._events; - - if (!events) - ret = []; - else { - evlistener = events[type]; - if (!evlistener) - ret = []; - else if (typeof evlistener === 'function') - ret = [evlistener.listener || evlistener]; - else - ret = unwrapListeners(evlistener); - } + EventEmitter.prototype.prependOnceListener = + function prependOnceListener(type, listener) { + if (typeof listener !== 'function') + throw new TypeError('"listener" argument must be a function'); + this.prependListener(type, _onceWrap(this, type, listener)); + return this; + }; - return ret; - }; + // emits a 'removeListener' event iff the listener was removed + EventEmitter.prototype.removeListener = + function removeListener(type, listener) { + var list, events, position, i, originalListener; - EventEmitter.listenerCount = function(emitter, type) { - if (typeof emitter.listenerCount === 'function') { - return emitter.listenerCount(type); - } else { - return listenerCount.call(emitter, type); - } - }; + if (typeof listener !== 'function') + throw new TypeError('"listener" argument must be a function'); - EventEmitter.prototype.listenerCount = listenerCount; - function listenerCount(type) { - var events = this._events; + events = this._events; + if (!events) + return this; - if (events) { - var evlistener = events[type]; + list = events[type]; + if (!list) + return this; - if (typeof evlistener === 'function') { - return 1; - } else if (evlistener) { - return evlistener.length; - } - } + if (list === listener || (list.listener && list.listener === listener)) { + if (--this._eventsCount === 0) + this._events = new EventHandlers(); + else { + delete events[type]; + if (events.removeListener) + this.emit('removeListener', type, list.listener || listener); + } + } else if (typeof list !== 'function') { + position = -1; + + for (i = list.length; i-- > 0;) { + if (list[i] === listener || + (list[i].listener && list[i].listener === listener)) { + originalListener = list[i].listener; + position = i; + break; + } + } - return 0; - } + if (position < 0) + return this; - EventEmitter.prototype.eventNames = function eventNames() { - return this._eventsCount > 0 ? Reflect.ownKeys(this._events) : []; - }; + if (list.length === 1) { + list[0] = undefined; + if (--this._eventsCount === 0) { + this._events = new EventHandlers(); + return this; + } else { + delete events[type]; + } + } else { + spliceOne(list, position); + } - // About 1.5x faster than the two-arg version of Array#splice(). - function spliceOne(list, index) { - for (var i = index, k = i + 1, n = list.length; k < n; i += 1, k += 1) - list[i] = list[k]; - list.pop(); - } + if (events.removeListener) + this.emit('removeListener', type, originalListener || listener); + } - function arrayClone(arr, i) { - var copy = new Array(i); - while (i--) - copy[i] = arr[i]; - return copy; - } + return this; + }; - function unwrapListeners(arr) { - var ret = new Array(arr.length); - for (var i = 0; i < ret.length; ++i) { - ret[i] = arr[i].listener || arr[i]; - } - return ret; - } + EventEmitter.prototype.removeAllListeners = + function removeAllListeners(type) { + var listeners, events; - // shim for using process in browser - // based off https://github.com/defunctzombie/node-process/blob/master/browser.js + events = this._events; + if (!events) + return this; - function defaultSetTimout() { - throw new Error('setTimeout has not been defined'); - } - function defaultClearTimeout () { - throw new Error('clearTimeout has not been defined'); - } - var cachedSetTimeout = defaultSetTimout; - var cachedClearTimeout = defaultClearTimeout; - if (typeof global$1.setTimeout === 'function') { - cachedSetTimeout = setTimeout; - } - if (typeof global$1.clearTimeout === 'function') { - cachedClearTimeout = clearTimeout; - } + // not listening for removeListener, no need to emit + if (!events.removeListener) { + if (arguments.length === 0) { + this._events = new EventHandlers(); + this._eventsCount = 0; + } else if (events[type]) { + if (--this._eventsCount === 0) + this._events = new EventHandlers(); + else + delete events[type]; + } + return this; + } + + // emit removeListener for all listeners on all events + if (arguments.length === 0) { + var keys = Object.keys(events); + for (var i = 0, key; i < keys.length; ++i) { + key = keys[i]; + if (key === 'removeListener') continue; + this.removeAllListeners(key); + } + this.removeAllListeners('removeListener'); + this._events = new EventHandlers(); + this._eventsCount = 0; + return this; + } + + listeners = events[type]; + + if (typeof listeners === 'function') { + this.removeListener(type, listeners); + } else if (listeners) { + // LIFO order + do { + this.removeListener(type, listeners[listeners.length - 1]); + } while (listeners[0]); + } + + return this; + }; + + EventEmitter.prototype.listeners = function listeners(type) { + var evlistener; + var ret; + var events = this._events; + + if (!events) + ret = []; + else { + evlistener = events[type]; + if (!evlistener) + ret = []; + else if (typeof evlistener === 'function') + ret = [evlistener.listener || evlistener]; + else + ret = unwrapListeners(evlistener); + } + + return ret; + }; + + EventEmitter.listenerCount = function(emitter, type) { + if (typeof emitter.listenerCount === 'function') { + return emitter.listenerCount(type); + } else { + return listenerCount.call(emitter, type); + } + }; + + EventEmitter.prototype.listenerCount = listenerCount; + function listenerCount(type) { + var events = this._events; + + if (events) { + var evlistener = events[type]; - function runTimeout(fun) { - if (cachedSetTimeout === setTimeout) { - //normal enviroments in sane situations - return setTimeout(fun, 0); + if (typeof evlistener === 'function') { + return 1; + } else if (evlistener) { + return evlistener.length; + } + } + + return 0; + } + + EventEmitter.prototype.eventNames = function eventNames() { + return this._eventsCount > 0 ? Reflect.ownKeys(this._events) : []; + }; + + // About 1.5x faster than the two-arg version of Array#splice(). + function spliceOne(list, index) { + for (var i = index, k = i + 1, n = list.length; k < n; i += 1, k += 1) + list[i] = list[k]; + list.pop(); + } + + function arrayClone(arr, i) { + var copy = new Array(i); + while (i--) + copy[i] = arr[i]; + return copy; + } + + function unwrapListeners(arr) { + var ret = new Array(arr.length); + for (var i = 0; i < ret.length; ++i) { + ret[i] = arr[i].listener || arr[i]; + } + return ret; + } + + // shim for using process in browser + // based off https://github.com/defunctzombie/node-process/blob/master/browser.js + + function defaultSetTimout() { + throw new Error('setTimeout has not been defined'); + } + function defaultClearTimeout () { + throw new Error('clearTimeout has not been defined'); } - // if setTimeout wasn't available but was latter defined - if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) { + var cachedSetTimeout = defaultSetTimout; + var cachedClearTimeout = defaultClearTimeout; + if (typeof global$1$1.setTimeout === 'function') { cachedSetTimeout = setTimeout; - return setTimeout(fun, 0); } - try { - // when when somebody has screwed with setTimeout but no I.E. maddness - return cachedSetTimeout(fun, 0); - } catch(e){ + if (typeof global$1$1.clearTimeout === 'function') { + cachedClearTimeout = clearTimeout; + } + + function runTimeout(fun) { + if (cachedSetTimeout === setTimeout) { + //normal enviroments in sane situations + return setTimeout(fun, 0); + } + // if setTimeout wasn't available but was latter defined + if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) { + cachedSetTimeout = setTimeout; + return setTimeout(fun, 0); + } try { - // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally - return cachedSetTimeout.call(null, fun, 0); + // when when somebody has screwed with setTimeout but no I.E. maddness + return cachedSetTimeout(fun, 0); } catch(e){ - // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error - return cachedSetTimeout.call(this, fun, 0); + try { + // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally + return cachedSetTimeout.call(null, fun, 0); + } catch(e){ + // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error + return cachedSetTimeout.call(this, fun, 0); + } } - } - } - function runClearTimeout(marker) { - if (cachedClearTimeout === clearTimeout) { - //normal enviroments in sane situations - return clearTimeout(marker); - } - // if clearTimeout wasn't available but was latter defined - if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) { - cachedClearTimeout = clearTimeout; - return clearTimeout(marker); } - try { - // when when somebody has screwed with setTimeout but no I.E. maddness - return cachedClearTimeout(marker); - } catch (e){ + function runClearTimeout(marker) { + if (cachedClearTimeout === clearTimeout) { + //normal enviroments in sane situations + return clearTimeout(marker); + } + // if clearTimeout wasn't available but was latter defined + if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) { + cachedClearTimeout = clearTimeout; + return clearTimeout(marker); + } try { - // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally - return cachedClearTimeout.call(null, marker); + // when when somebody has screwed with setTimeout but no I.E. maddness + return cachedClearTimeout(marker); } catch (e){ - // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error. - // Some versions of I.E. have different rules for clearTimeout vs setTimeout - return cachedClearTimeout.call(this, marker); + try { + // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally + return cachedClearTimeout.call(null, marker); + } catch (e){ + // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error. + // Some versions of I.E. have different rules for clearTimeout vs setTimeout + return cachedClearTimeout.call(this, marker); + } } - } - } - var queue = []; - var draining = false; - var currentQueue; - var queueIndex = -1; + } + var queue = []; + var draining = false; + var currentQueue; + var queueIndex = -1; - function cleanUpNextTick() { - if (!draining || !currentQueue) { - return; + function cleanUpNextTick() { + if (!draining || !currentQueue) { + return; + } + draining = false; + if (currentQueue.length) { + queue = currentQueue.concat(queue); + } else { + queueIndex = -1; + } + if (queue.length) { + drainQueue(); + } } - draining = false; - if (currentQueue.length) { - queue = currentQueue.concat(queue); - } else { - queueIndex = -1; + + function drainQueue() { + if (draining) { + return; + } + var timeout = runTimeout(cleanUpNextTick); + draining = true; + + var len = queue.length; + while(len) { + currentQueue = queue; + queue = []; + while (++queueIndex < len) { + if (currentQueue) { + currentQueue[queueIndex].run(); + } + } + queueIndex = -1; + len = queue.length; + } + currentQueue = null; + draining = false; + runClearTimeout(timeout); + } + function nextTick(fun) { + var args = new Array(arguments.length - 1); + if (arguments.length > 1) { + for (var i = 1; i < arguments.length; i++) { + args[i - 1] = arguments[i]; + } + } + queue.push(new Item(fun, args)); + if (queue.length === 1 && !draining) { + runTimeout(drainQueue); + } } - if (queue.length) { - drainQueue(); + // v8 likes predictible objects + function Item(fun, array) { + this.fun = fun; + this.array = array; } - } + Item.prototype.run = function () { + this.fun.apply(null, this.array); + }; - function drainQueue() { - if (draining) { - return; + // from https://github.com/kumavis/browser-process-hrtime/blob/master/index.js + var performance = global$1$1.performance || {}; + var performanceNow = + performance.now || + performance.mozNow || + performance.msNow || + performance.oNow || + performance.webkitNow || + function(){ return (new Date()).getTime() }; + + var inherits; + if (typeof Object.create === 'function'){ + inherits = function inherits(ctor, superCtor) { + // implementation from standard node.js 'util' module + ctor.super_ = superCtor; + ctor.prototype = Object.create(superCtor.prototype, { + constructor: { + value: ctor, + enumerable: false, + writable: true, + configurable: true + } + }); + }; + } else { + inherits = function inherits(ctor, superCtor) { + ctor.super_ = superCtor; + var TempCtor = function () {}; + TempCtor.prototype = superCtor.prototype; + ctor.prototype = new TempCtor(); + ctor.prototype.constructor = ctor; + }; } - var timeout = runTimeout(cleanUpNextTick); - draining = true; + var inherits$1 = inherits; - var len = queue.length; - while(len) { - currentQueue = queue; - queue = []; - while (++queueIndex < len) { - if (currentQueue) { - currentQueue[queueIndex].run(); + var formatRegExp = /%[sdj%]/g; + function format(f) { + if (!isString(f)) { + var objects = []; + for (var i = 0; i < arguments.length; i++) { + objects.push(inspect(arguments[i])); + } + return objects.join(' '); + } + + var i = 1; + var args = arguments; + var len = args.length; + var str = String(f).replace(formatRegExp, function(x) { + if (x === '%%') return '%'; + if (i >= len) return x; + switch (x) { + case '%s': return String(args[i++]); + case '%d': return Number(args[i++]); + case '%j': + try { + return JSON.stringify(args[i++]); + } catch (_) { + return '[Circular]'; } + default: + return x; } - queueIndex = -1; - len = queue.length; - } - currentQueue = null; - draining = false; - runClearTimeout(timeout); - } - function nextTick(fun) { - var args = new Array(arguments.length - 1); - if (arguments.length > 1) { - for (var i = 1; i < arguments.length; i++) { - args[i - 1] = arguments[i]; + }); + for (var x = args[i]; i < len; x = args[++i]) { + if (isNull(x) || !isObject(x)) { + str += ' ' + x; + } else { + str += ' ' + inspect(x); } + } + return str; } - queue.push(new Item(fun, args)); - if (queue.length === 1 && !draining) { - runTimeout(drainQueue); - } - } - // v8 likes predictible objects - function Item(fun, array) { - this.fun = fun; - this.array = array; - } - Item.prototype.run = function () { - this.fun.apply(null, this.array); - }; - // from https://github.com/kumavis/browser-process-hrtime/blob/master/index.js - var performance = global$1.performance || {}; - var performanceNow = - performance.now || - performance.mozNow || - performance.msNow || - performance.oNow || - performance.webkitNow || - function(){ return (new Date()).getTime() }; - - var inherits; - if (typeof Object.create === 'function'){ - inherits = function inherits(ctor, superCtor) { - // implementation from standard node.js 'util' module - ctor.super_ = superCtor; - ctor.prototype = Object.create(superCtor.prototype, { - constructor: { - value: ctor, - enumerable: false, - writable: true, - configurable: true + // Mark that a method should not be used. + // Returns a modified function which warns once by default. + // If --no-deprecation is set, then it is a no-op. + function deprecate(fn, msg) { + // Allow for deprecating things in the process of starting up. + if (isUndefined(global$1$1.process)) { + return function() { + return deprecate(fn, msg).apply(this, arguments); + }; } - }); - }; - } else { - inherits = function inherits(ctor, superCtor) { - ctor.super_ = superCtor; - var TempCtor = function () {}; - TempCtor.prototype = superCtor.prototype; - ctor.prototype = new TempCtor(); - ctor.prototype.constructor = ctor; - }; - } - var inherits$1 = inherits; - var formatRegExp = /%[sdj%]/g; - function format(f) { - if (!isString(f)) { - var objects = []; - for (var i = 0; i < arguments.length; i++) { - objects.push(inspect(arguments[i])); - } - return objects.join(' '); - } + var warned = false; + function deprecated() { + if (!warned) { + { + console.error(msg); + } + warned = true; + } + return fn.apply(this, arguments); + } - var i = 1; - var args = arguments; - var len = args.length; - var str = String(f).replace(formatRegExp, function(x) { - if (x === '%%') return '%'; - if (i >= len) return x; - switch (x) { - case '%s': return String(args[i++]); - case '%d': return Number(args[i++]); - case '%j': - try { - return JSON.stringify(args[i++]); - } catch (_) { - return '[Circular]'; + return deprecated; + } + + var debugs = {}; + var debugEnviron; + function debuglog(set) { + if (isUndefined(debugEnviron)) + debugEnviron = ''; + set = set.toUpperCase(); + if (!debugs[set]) { + if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) { + var pid = 0; + debugs[set] = function() { + var msg = format.apply(null, arguments); + console.error('%s %d: %s', set, pid, msg); + }; + } else { + debugs[set] = function() {}; } - default: - return x; - } - }); - for (var x = args[i]; i < len; x = args[++i]) { - if (isNull(x) || !isObject(x)) { - str += ' ' + x; - } else { - str += ' ' + inspect(x); + } + return debugs[set]; } - } - return str; - } - // Mark that a method should not be used. - // Returns a modified function which warns once by default. - // If --no-deprecation is set, then it is a no-op. - function deprecate(fn, msg) { - // Allow for deprecating things in the process of starting up. - if (isUndefined(global$1.process)) { - return function() { - return deprecate(fn, msg).apply(this, arguments); + /** + * Echos the value of a value. Trys to print the value out + * in the best way possible given the different types. + * + * @param {Object} obj The object to print out. + * @param {Object} opts Optional options object that alters the output. + */ + /* legacy: obj, showHidden, depth, colors*/ + function inspect(obj, opts) { + // default options + var ctx = { + seen: [], + stylize: stylizeNoColor + }; + // legacy... + if (arguments.length >= 3) ctx.depth = arguments[2]; + if (arguments.length >= 4) ctx.colors = arguments[3]; + if (isBoolean(opts)) { + // legacy... + ctx.showHidden = opts; + } else if (opts) { + // got an "options" object + _extend(ctx, opts); + } + // set default options + if (isUndefined(ctx.showHidden)) ctx.showHidden = false; + if (isUndefined(ctx.depth)) ctx.depth = 2; + if (isUndefined(ctx.colors)) ctx.colors = false; + if (isUndefined(ctx.customInspect)) ctx.customInspect = true; + if (ctx.colors) ctx.stylize = stylizeWithColor; + return formatValue(ctx, obj, ctx.depth); + } + + // http://en.wikipedia.org/wiki/ANSI_escape_code#graphics + inspect.colors = { + 'bold' : [1, 22], + 'italic' : [3, 23], + 'underline' : [4, 24], + 'inverse' : [7, 27], + 'white' : [37, 39], + 'grey' : [90, 39], + 'black' : [30, 39], + 'blue' : [34, 39], + 'cyan' : [36, 39], + 'green' : [32, 39], + 'magenta' : [35, 39], + 'red' : [31, 39], + 'yellow' : [33, 39] + }; + + // Don't use 'blue' not visible on cmd.exe + inspect.styles = { + 'special': 'cyan', + 'number': 'yellow', + 'boolean': 'yellow', + 'undefined': 'grey', + 'null': 'bold', + 'string': 'green', + 'date': 'magenta', + // "name": intentionally not styling + 'regexp': 'red' }; - } - var warned = false; - function deprecated() { - if (!warned) { - { - console.error(msg); + + function stylizeWithColor(str, styleType) { + var style = inspect.styles[styleType]; + + if (style) { + return '\u001b[' + inspect.colors[style][0] + 'm' + str + + '\u001b[' + inspect.colors[style][1] + 'm'; + } else { + return str; } - warned = true; } - return fn.apply(this, arguments); - } - return deprecated; - } - var debugs = {}; - var debugEnviron; - function debuglog(set) { - if (isUndefined(debugEnviron)) - debugEnviron = ''; - set = set.toUpperCase(); - if (!debugs[set]) { - if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) { - var pid = 0; - debugs[set] = function() { - var msg = format.apply(null, arguments); - console.error('%s %d: %s', set, pid, msg); - }; - } else { - debugs[set] = function() {}; + function stylizeNoColor(str, styleType) { + return str; } - } - return debugs[set]; - } - /** - * Echos the value of a value. Trys to print the value out - * in the best way possible given the different types. - * - * @param {Object} obj The object to print out. - * @param {Object} opts Optional options object that alters the output. - */ - /* legacy: obj, showHidden, depth, colors*/ - function inspect(obj, opts) { - // default options - var ctx = { - seen: [], - stylize: stylizeNoColor - }; - // legacy... - if (arguments.length >= 3) ctx.depth = arguments[2]; - if (arguments.length >= 4) ctx.colors = arguments[3]; - if (isBoolean(opts)) { - // legacy... - ctx.showHidden = opts; - } else if (opts) { - // got an "options" object - _extend(ctx, opts); - } - // set default options - if (isUndefined(ctx.showHidden)) ctx.showHidden = false; - if (isUndefined(ctx.depth)) ctx.depth = 2; - if (isUndefined(ctx.colors)) ctx.colors = false; - if (isUndefined(ctx.customInspect)) ctx.customInspect = true; - if (ctx.colors) ctx.stylize = stylizeWithColor; - return formatValue(ctx, obj, ctx.depth); - } - // http://en.wikipedia.org/wiki/ANSI_escape_code#graphics - inspect.colors = { - 'bold' : [1, 22], - 'italic' : [3, 23], - 'underline' : [4, 24], - 'inverse' : [7, 27], - 'white' : [37, 39], - 'grey' : [90, 39], - 'black' : [30, 39], - 'blue' : [34, 39], - 'cyan' : [36, 39], - 'green' : [32, 39], - 'magenta' : [35, 39], - 'red' : [31, 39], - 'yellow' : [33, 39] - }; + function arrayToHash(array) { + var hash = {}; - // Don't use 'blue' not visible on cmd.exe - inspect.styles = { - 'special': 'cyan', - 'number': 'yellow', - 'boolean': 'yellow', - 'undefined': 'grey', - 'null': 'bold', - 'string': 'green', - 'date': 'magenta', - // "name": intentionally not styling - 'regexp': 'red' - }; + array.forEach(function(val, idx) { + hash[val] = true; + }); + return hash; + } - function stylizeWithColor(str, styleType) { - var style = inspect.styles[styleType]; - if (style) { - return '\u001b[' + inspect.colors[style][0] + 'm' + str + - '\u001b[' + inspect.colors[style][1] + 'm'; - } else { - return str; - } - } + function formatValue(ctx, value, recurseTimes) { + // Provide a hook for user-specified inspect functions. + // Check that value is an object with an inspect function on it + if (ctx.customInspect && + value && + isFunction(value.inspect) && + // Filter out the util module, it's inspect function is special + value.inspect !== inspect && + // Also filter out any prototype objects using the circular check. + !(value.constructor && value.constructor.prototype === value)) { + var ret = value.inspect(recurseTimes, ctx); + if (!isString(ret)) { + ret = formatValue(ctx, ret, recurseTimes); + } + return ret; + } + // Primitive types cannot have properties + var primitive = formatPrimitive(ctx, value); + if (primitive) { + return primitive; + } - function stylizeNoColor(str, styleType) { - return str; - } + // Look up the keys of the object. + var keys = Object.keys(value); + var visibleKeys = arrayToHash(keys); + if (ctx.showHidden) { + keys = Object.getOwnPropertyNames(value); + } - function arrayToHash(array) { - var hash = {}; + // IE doesn't make error fields non-enumerable + // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx + if (isError(value) + && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) { + return formatError(value); + } - array.forEach(function(val, idx) { - hash[val] = true; - }); + // Some type of object without properties can be shortcutted. + if (keys.length === 0) { + if (isFunction(value)) { + var name = value.name ? ': ' + value.name : ''; + return ctx.stylize('[Function' + name + ']', 'special'); + } + if (isRegExp(value)) { + return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp'); + } + if (isDate(value)) { + return ctx.stylize(Date.prototype.toString.call(value), 'date'); + } + if (isError(value)) { + return formatError(value); + } + } - return hash; - } + var base = '', array = false, braces = ['{', '}']; + // Make Array say that they are Array + if (isArray$1(value)) { + array = true; + braces = ['[', ']']; + } - function formatValue(ctx, value, recurseTimes) { - // Provide a hook for user-specified inspect functions. - // Check that value is an object with an inspect function on it - if (ctx.customInspect && - value && - isFunction(value.inspect) && - // Filter out the util module, it's inspect function is special - value.inspect !== inspect && - // Also filter out any prototype objects using the circular check. - !(value.constructor && value.constructor.prototype === value)) { - var ret = value.inspect(recurseTimes, ctx); - if (!isString(ret)) { - ret = formatValue(ctx, ret, recurseTimes); - } - return ret; - } + // Make functions say that they are functions + if (isFunction(value)) { + var n = value.name ? ': ' + value.name : ''; + base = ' [Function' + n + ']'; + } - // Primitive types cannot have properties - var primitive = formatPrimitive(ctx, value); - if (primitive) { - return primitive; - } + // Make RegExps say that they are RegExps + if (isRegExp(value)) { + base = ' ' + RegExp.prototype.toString.call(value); + } - // Look up the keys of the object. - var keys = Object.keys(value); - var visibleKeys = arrayToHash(keys); + // Make dates with properties first say the date + if (isDate(value)) { + base = ' ' + Date.prototype.toUTCString.call(value); + } - if (ctx.showHidden) { - keys = Object.getOwnPropertyNames(value); - } + // Make error with message first say the error + if (isError(value)) { + base = ' ' + formatError(value); + } - // IE doesn't make error fields non-enumerable - // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx - if (isError(value) - && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) { - return formatError(value); - } + if (keys.length === 0 && (!array || value.length == 0)) { + return braces[0] + base + braces[1]; + } - // Some type of object without properties can be shortcutted. - if (keys.length === 0) { - if (isFunction(value)) { - var name = value.name ? ': ' + value.name : ''; - return ctx.stylize('[Function' + name + ']', 'special'); - } - if (isRegExp(value)) { - return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp'); - } - if (isDate(value)) { - return ctx.stylize(Date.prototype.toString.call(value), 'date'); - } - if (isError(value)) { - return formatError(value); - } - } + if (recurseTimes < 0) { + if (isRegExp(value)) { + return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp'); + } else { + return ctx.stylize('[Object]', 'special'); + } + } - var base = '', array = false, braces = ['{', '}']; + ctx.seen.push(value); - // Make Array say that they are Array - if (isArray$1(value)) { - array = true; - braces = ['[', ']']; - } + var output; + if (array) { + output = formatArray(ctx, value, recurseTimes, visibleKeys, keys); + } else { + output = keys.map(function(key) { + return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array); + }); + } - // Make functions say that they are functions - if (isFunction(value)) { - var n = value.name ? ': ' + value.name : ''; - base = ' [Function' + n + ']'; - } + ctx.seen.pop(); - // Make RegExps say that they are RegExps - if (isRegExp(value)) { - base = ' ' + RegExp.prototype.toString.call(value); - } + return reduceToSingleString(output, base, braces); + } - // Make dates with properties first say the date - if (isDate(value)) { - base = ' ' + Date.prototype.toUTCString.call(value); - } - // Make error with message first say the error - if (isError(value)) { - base = ' ' + formatError(value); - } + function formatPrimitive(ctx, value) { + if (isUndefined(value)) + return ctx.stylize('undefined', 'undefined'); + if (isString(value)) { + var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '') + .replace(/'/g, "\\'") + .replace(/\\"/g, '"') + '\''; + return ctx.stylize(simple, 'string'); + } + if (isNumber(value)) + return ctx.stylize('' + value, 'number'); + if (isBoolean(value)) + return ctx.stylize('' + value, 'boolean'); + // For some reason typeof null is "object", so special case here. + if (isNull(value)) + return ctx.stylize('null', 'null'); + } - if (keys.length === 0 && (!array || value.length == 0)) { - return braces[0] + base + braces[1]; - } - if (recurseTimes < 0) { - if (isRegExp(value)) { - return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp'); - } else { - return ctx.stylize('[Object]', 'special'); + function formatError(value) { + return '[' + Error.prototype.toString.call(value) + ']'; } - } - - ctx.seen.push(value); - var output; - if (array) { - output = formatArray(ctx, value, recurseTimes, visibleKeys, keys); - } else { - output = keys.map(function(key) { - return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array); - }); - } - ctx.seen.pop(); + function formatArray(ctx, value, recurseTimes, visibleKeys, keys) { + var output = []; + for (var i = 0, l = value.length; i < l; ++i) { + if (hasOwnProperty(value, String(i))) { + output.push(formatProperty(ctx, value, recurseTimes, visibleKeys, + String(i), true)); + } else { + output.push(''); + } + } + keys.forEach(function(key) { + if (!key.match(/^\d+$/)) { + output.push(formatProperty(ctx, value, recurseTimes, visibleKeys, + key, true)); + } + }); + return output; + } - return reduceToSingleString(output, base, braces); - } + function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) { + var name, str, desc; + desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] }; + if (desc.get) { + if (desc.set) { + str = ctx.stylize('[Getter/Setter]', 'special'); + } else { + str = ctx.stylize('[Getter]', 'special'); + } + } else { + if (desc.set) { + str = ctx.stylize('[Setter]', 'special'); + } + } + if (!hasOwnProperty(visibleKeys, key)) { + name = '[' + key + ']'; + } + if (!str) { + if (ctx.seen.indexOf(desc.value) < 0) { + if (isNull(recurseTimes)) { + str = formatValue(ctx, desc.value, null); + } else { + str = formatValue(ctx, desc.value, recurseTimes - 1); + } + if (str.indexOf('\n') > -1) { + if (array) { + str = str.split('\n').map(function(line) { + return ' ' + line; + }).join('\n').substr(2); + } else { + str = '\n' + str.split('\n').map(function(line) { + return ' ' + line; + }).join('\n'); + } + } + } else { + str = ctx.stylize('[Circular]', 'special'); + } + } + if (isUndefined(name)) { + if (array && key.match(/^\d+$/)) { + return str; + } + name = JSON.stringify('' + key); + if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) { + name = name.substr(1, name.length - 2); + name = ctx.stylize(name, 'name'); + } else { + name = name.replace(/'/g, "\\'") + .replace(/\\"/g, '"') + .replace(/(^"|"$)/g, "'"); + name = ctx.stylize(name, 'string'); + } + } - function formatPrimitive(ctx, value) { - if (isUndefined(value)) - return ctx.stylize('undefined', 'undefined'); - if (isString(value)) { - var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '') - .replace(/'/g, "\\'") - .replace(/\\"/g, '"') + '\''; - return ctx.stylize(simple, 'string'); - } - if (isNumber(value)) - return ctx.stylize('' + value, 'number'); - if (isBoolean(value)) - return ctx.stylize('' + value, 'boolean'); - // For some reason typeof null is "object", so special case here. - if (isNull(value)) - return ctx.stylize('null', 'null'); - } + return name + ': ' + str; + } - function formatError(value) { - return '[' + Error.prototype.toString.call(value) + ']'; - } + function reduceToSingleString(output, base, braces) { + var length = output.reduce(function(prev, cur) { + if (cur.indexOf('\n') >= 0) ; + return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1; + }, 0); + if (length > 60) { + return braces[0] + + (base === '' ? '' : base + '\n ') + + ' ' + + output.join(',\n ') + + ' ' + + braces[1]; + } - function formatArray(ctx, value, recurseTimes, visibleKeys, keys) { - var output = []; - for (var i = 0, l = value.length; i < l; ++i) { - if (hasOwnProperty(value, String(i))) { - output.push(formatProperty(ctx, value, recurseTimes, visibleKeys, - String(i), true)); - } else { - output.push(''); + return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1]; } - } - keys.forEach(function(key) { - if (!key.match(/^\d+$/)) { - output.push(formatProperty(ctx, value, recurseTimes, visibleKeys, - key, true)); - } - }); - return output; - } - function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) { - var name, str, desc; - desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] }; - if (desc.get) { - if (desc.set) { - str = ctx.stylize('[Getter/Setter]', 'special'); - } else { - str = ctx.stylize('[Getter]', 'special'); - } - } else { - if (desc.set) { - str = ctx.stylize('[Setter]', 'special'); - } - } - if (!hasOwnProperty(visibleKeys, key)) { - name = '[' + key + ']'; - } - if (!str) { - if (ctx.seen.indexOf(desc.value) < 0) { - if (isNull(recurseTimes)) { - str = formatValue(ctx, desc.value, null); - } else { - str = formatValue(ctx, desc.value, recurseTimes - 1); - } - if (str.indexOf('\n') > -1) { - if (array) { - str = str.split('\n').map(function(line) { - return ' ' + line; - }).join('\n').substr(2); - } else { - str = '\n' + str.split('\n').map(function(line) { - return ' ' + line; - }).join('\n'); - } - } - } else { - str = ctx.stylize('[Circular]', 'special'); + // NOTE: These type checking functions intentionally don't use `instanceof` + // because it is fragile and can be easily faked with `Object.create()`. + function isArray$1(ar) { + return Array.isArray(ar); } - } - if (isUndefined(name)) { - if (array && key.match(/^\d+$/)) { - return str; + + function isBoolean(arg) { + return typeof arg === 'boolean'; } - name = JSON.stringify('' + key); - if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) { - name = name.substr(1, name.length - 2); - name = ctx.stylize(name, 'name'); - } else { - name = name.replace(/'/g, "\\'") - .replace(/\\"/g, '"') - .replace(/(^"|"$)/g, "'"); - name = ctx.stylize(name, 'string'); + + function isNull(arg) { + return arg === null; } - } - return name + ': ' + str; - } + function isNumber(arg) { + return typeof arg === 'number'; + } + function isString(arg) { + return typeof arg === 'string'; + } - function reduceToSingleString(output, base, braces) { - var length = output.reduce(function(prev, cur) { - if (cur.indexOf('\n') >= 0) ; - return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1; - }, 0); + function isUndefined(arg) { + return arg === void 0; + } - if (length > 60) { - return braces[0] + - (base === '' ? '' : base + '\n ') + - ' ' + - output.join(',\n ') + - ' ' + - braces[1]; - } + function isRegExp(re) { + return isObject(re) && objectToString(re) === '[object RegExp]'; + } - return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1]; - } + function isObject(arg) { + return typeof arg === 'object' && arg !== null; + } + function isDate(d) { + return isObject(d) && objectToString(d) === '[object Date]'; + } - // NOTE: These type checking functions intentionally don't use `instanceof` - // because it is fragile and can be easily faked with `Object.create()`. - function isArray$1(ar) { - return Array.isArray(ar); - } + function isError(e) { + return isObject(e) && + (objectToString(e) === '[object Error]' || e instanceof Error); + } - function isBoolean(arg) { - return typeof arg === 'boolean'; - } + function isFunction(arg) { + return typeof arg === 'function'; + } - function isNull(arg) { - return arg === null; - } + function objectToString(o) { + return Object.prototype.toString.call(o); + } - function isNumber(arg) { - return typeof arg === 'number'; - } + function _extend(origin, add) { + // Don't do anything if add isn't an object + if (!add || !isObject(add)) return origin; - function isString(arg) { - return typeof arg === 'string'; - } + var keys = Object.keys(add); + var i = keys.length; + while (i--) { + origin[keys[i]] = add[keys[i]]; + } + return origin; + } + function hasOwnProperty(obj, prop) { + return Object.prototype.hasOwnProperty.call(obj, prop); + } + + var INSPECT_MAX_BYTES$1 = 50; + + /** + * If `Buffer.TYPED_ARRAY_SUPPORT`: + * === true Use Uint8Array implementation (fastest) + * === false Use 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+. + * + * Due to various browser bugs, sometimes the Object implementation will be used even + * when the browser supports typed arrays. + * + * Note: + * + * - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances, + * See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438. + * + * - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function. + * + * - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of + * incorrect length in some situations. + + * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they + * get the Object implementation, which is slower but behaves correctly. + */ + Buffer$1.TYPED_ARRAY_SUPPORT = global$1$1.TYPED_ARRAY_SUPPORT !== undefined + ? global$1$1.TYPED_ARRAY_SUPPORT + : true; - function isUndefined(arg) { - return arg === void 0; - } + function kMaxLength$1 () { + return Buffer$1.TYPED_ARRAY_SUPPORT + ? 0x7fffffff + : 0x3fffffff + } - function isRegExp(re) { - return isObject(re) && objectToString(re) === '[object RegExp]'; - } + function createBuffer$1 (that, length) { + if (kMaxLength$1() < length) { + throw new RangeError('Invalid typed array length') + } + if (Buffer$1.TYPED_ARRAY_SUPPORT) { + // Return an augmented `Uint8Array` instance, for best performance + that = new Uint8Array(length); + that.__proto__ = Buffer$1.prototype; + } else { + // Fallback: Return an object instance of the Buffer class + if (that === null) { + that = new Buffer$1(length); + } + that.length = length; + } - function isObject(arg) { - return typeof arg === 'object' && arg !== null; - } + return that + } - function isDate(d) { - return isObject(d) && objectToString(d) === '[object Date]'; - } + /** + * 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 isError(e) { - return isObject(e) && - (objectToString(e) === '[object Error]' || e instanceof Error); - } + function Buffer$1 (arg, encodingOrOffset, length) { + if (!Buffer$1.TYPED_ARRAY_SUPPORT && !(this instanceof Buffer$1)) { + return new Buffer$1(arg, encodingOrOffset, length) + } - function isFunction(arg) { - return typeof arg === 'function'; - } + // Common case. + if (typeof arg === 'number') { + if (typeof encodingOrOffset === 'string') { + throw new Error( + 'If encoding is specified then the first argument must be a string' + ) + } + return allocUnsafe$1(this, arg) + } + return from$1(this, arg, encodingOrOffset, length) + } - function objectToString(o) { - return Object.prototype.toString.call(o); - } + Buffer$1.poolSize = 8192; // not used by this implementation - function _extend(origin, add) { - // Don't do anything if add isn't an object - if (!add || !isObject(add)) return origin; + // TODO: Legacy, not needed anymore. Remove in next major version. + Buffer$1._augment = function (arr) { + arr.__proto__ = Buffer$1.prototype; + return arr + }; - var keys = Object.keys(add); - var i = keys.length; - while (i--) { - origin[keys[i]] = add[keys[i]]; - } - return origin; - } - function hasOwnProperty(obj, prop) { - return Object.prototype.hasOwnProperty.call(obj, prop); - } + function from$1 (that, value, encodingOrOffset, length) { + if (typeof value === 'number') { + throw new TypeError('"value" argument must not be a number') + } - var INSPECT_MAX_BYTES$1 = 50; - - /** - * If `Buffer.TYPED_ARRAY_SUPPORT`: - * === true Use Uint8Array implementation (fastest) - * === false Use 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+. - * - * Due to various browser bugs, sometimes the Object implementation will be used even - * when the browser supports typed arrays. - * - * Note: - * - * - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances, - * See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438. - * - * - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function. - * - * - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of - * incorrect length in some situations. - - * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they - * get the Object implementation, which is slower but behaves correctly. - */ - Buffer$1.TYPED_ARRAY_SUPPORT = global$1.TYPED_ARRAY_SUPPORT !== undefined - ? global$1.TYPED_ARRAY_SUPPORT - : true; - - function kMaxLength$1 () { - return Buffer$1.TYPED_ARRAY_SUPPORT - ? 0x7fffffff - : 0x3fffffff - } + if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) { + return fromArrayBuffer$1(that, value, encodingOrOffset, length) + } - function createBuffer$1 (that, length) { - if (kMaxLength$1() < length) { - throw new RangeError('Invalid typed array length') - } - if (Buffer$1.TYPED_ARRAY_SUPPORT) { - // Return an augmented `Uint8Array` instance, for best performance - that = new Uint8Array(length); - that.__proto__ = Buffer$1.prototype; - } else { - // Fallback: Return an object instance of the Buffer class - if (that === null) { - that = new Buffer$1(length); - } - that.length = length; - } + if (typeof value === 'string') { + return fromString$1(that, value, encodingOrOffset) + } - return that - } + return fromObject$1(that, value) + } - /** - * 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$1 (arg, encodingOrOffset, length) { - if (!Buffer$1.TYPED_ARRAY_SUPPORT && !(this instanceof Buffer$1)) { - return new Buffer$1(arg, encodingOrOffset, length) - } + /** + * 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$1.from = function (value, encodingOrOffset, length) { + return from$1(null, value, encodingOrOffset, length) + }; - // Common case. - if (typeof arg === 'number') { - if (typeof encodingOrOffset === 'string') { - throw new Error( - 'If encoding is specified then the first argument must be a string' - ) + if (Buffer$1.TYPED_ARRAY_SUPPORT) { + Buffer$1.prototype.__proto__ = Uint8Array.prototype; + Buffer$1.__proto__ = Uint8Array; } - return allocUnsafe$1(this, arg) - } - return from$1(this, arg, encodingOrOffset, length) - } - - Buffer$1.poolSize = 8192; // not used by this implementation - // TODO: Legacy, not needed anymore. Remove in next major version. - Buffer$1._augment = function (arr) { - arr.__proto__ = Buffer$1.prototype; - return arr - }; + function assertSize$1 (size) { + if (typeof size !== 'number') { + throw new TypeError('"size" argument must be a number') + } else if (size < 0) { + throw new RangeError('"size" argument must not be negative') + } + } - function from$1 (that, value, encodingOrOffset, length) { - if (typeof value === 'number') { - throw new TypeError('"value" argument must not be a number') - } + function alloc$1 (that, size, fill, encoding) { + assertSize$1(size); + if (size <= 0) { + return createBuffer$1(that, size) + } + if (fill !== undefined) { + // Only pay attention to encoding if it's a string. This + // prevents accidentally sending in a number that would + // be interpretted as a start offset. + return typeof encoding === 'string' + ? createBuffer$1(that, size).fill(fill, encoding) + : createBuffer$1(that, size).fill(fill) + } + return createBuffer$1(that, size) + } - if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) { - return fromArrayBuffer$1(that, value, encodingOrOffset, length) - } + /** + * Creates a new filled Buffer instance. + * alloc(size[, fill[, encoding]]) + **/ + Buffer$1.alloc = function (size, fill, encoding) { + return alloc$1(null, size, fill, encoding) + }; - if (typeof value === 'string') { - return fromString$1(that, value, encodingOrOffset) - } + function allocUnsafe$1 (that, size) { + assertSize$1(size); + that = createBuffer$1(that, size < 0 ? 0 : checked$1(size) | 0); + if (!Buffer$1.TYPED_ARRAY_SUPPORT) { + for (var i = 0; i < size; ++i) { + that[i] = 0; + } + } + return that + } - return fromObject$1(that, value) - } + /** + * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance. + * */ + Buffer$1.allocUnsafe = function (size) { + return allocUnsafe$1(null, size) + }; + /** + * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance. + */ + Buffer$1.allocUnsafeSlow = function (size) { + return allocUnsafe$1(null, size) + }; - /** - * 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$1.from = function (value, encodingOrOffset, length) { - return from$1(null, value, encodingOrOffset, length) - }; + function fromString$1 (that, string, encoding) { + if (typeof encoding !== 'string' || encoding === '') { + encoding = 'utf8'; + } - if (Buffer$1.TYPED_ARRAY_SUPPORT) { - Buffer$1.prototype.__proto__ = Uint8Array.prototype; - Buffer$1.__proto__ = Uint8Array; - } + if (!Buffer$1.isEncoding(encoding)) { + throw new TypeError('"encoding" must be a valid string encoding') + } - function assertSize$1 (size) { - if (typeof size !== 'number') { - throw new TypeError('"size" argument must be a number') - } else if (size < 0) { - throw new RangeError('"size" argument must not be negative') - } - } + var length = byteLength$1(string, encoding) | 0; + that = createBuffer$1(that, length); - function alloc$1 (that, size, fill, encoding) { - assertSize$1(size); - if (size <= 0) { - return createBuffer$1(that, size) - } - if (fill !== undefined) { - // Only pay attention to encoding if it's a string. This - // prevents accidentally sending in a number that would - // be interpretted as a start offset. - return typeof encoding === 'string' - ? createBuffer$1(that, size).fill(fill, encoding) - : createBuffer$1(that, size).fill(fill) - } - return createBuffer$1(that, size) - } + var actual = that.write(string, encoding); - /** - * Creates a new filled Buffer instance. - * alloc(size[, fill[, encoding]]) - **/ - Buffer$1.alloc = function (size, fill, encoding) { - return alloc$1(null, size, fill, 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') + that = that.slice(0, actual); + } - function allocUnsafe$1 (that, size) { - assertSize$1(size); - that = createBuffer$1(that, size < 0 ? 0 : checked$1(size) | 0); - if (!Buffer$1.TYPED_ARRAY_SUPPORT) { - for (var i = 0; i < size; ++i) { - that[i] = 0; + return that } - } - return that - } - - /** - * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance. - * */ - Buffer$1.allocUnsafe = function (size) { - return allocUnsafe$1(null, size) - }; - /** - * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance. - */ - Buffer$1.allocUnsafeSlow = function (size) { - return allocUnsafe$1(null, size) - }; - - function fromString$1 (that, string, encoding) { - if (typeof encoding !== 'string' || encoding === '') { - encoding = 'utf8'; - } - - if (!Buffer$1.isEncoding(encoding)) { - throw new TypeError('"encoding" must be a valid string encoding') - } - var length = byteLength$1(string, encoding) | 0; - that = createBuffer$1(that, length); + function fromArrayLike$1 (that, array) { + var length = array.length < 0 ? 0 : checked$1(array.length) | 0; + that = createBuffer$1(that, length); + for (var i = 0; i < length; i += 1) { + that[i] = array[i] & 255; + } + return that + } - var actual = that.write(string, encoding); + function fromArrayBuffer$1 (that, array, byteOffset, length) { + array.byteLength; // this throws if `array` is not a valid ArrayBuffer - 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') - that = that.slice(0, actual); - } + if (byteOffset < 0 || array.byteLength < byteOffset) { + throw new RangeError('\'offset\' is out of bounds') + } - return that - } + if (array.byteLength < byteOffset + (length || 0)) { + throw new RangeError('\'length\' is out of bounds') + } - function fromArrayLike$1 (that, array) { - var length = array.length < 0 ? 0 : checked$1(array.length) | 0; - that = createBuffer$1(that, length); - for (var i = 0; i < length; i += 1) { - that[i] = array[i] & 255; - } - return that - } + if (byteOffset === undefined && length === undefined) { + array = new Uint8Array(array); + } else if (length === undefined) { + array = new Uint8Array(array, byteOffset); + } else { + array = new Uint8Array(array, byteOffset, length); + } - function fromArrayBuffer$1 (that, array, byteOffset, length) { - array.byteLength; // this throws if `array` is not a valid ArrayBuffer + if (Buffer$1.TYPED_ARRAY_SUPPORT) { + // Return an augmented `Uint8Array` instance, for best performance + that = array; + that.__proto__ = Buffer$1.prototype; + } else { + // Fallback: Return an object instance of the Buffer class + that = fromArrayLike$1(that, array); + } + return that + } - if (byteOffset < 0 || array.byteLength < byteOffset) { - throw new RangeError('\'offset\' is out of bounds') - } + function fromObject$1 (that, obj) { + if (internalIsBuffer$1(obj)) { + var len = checked$1(obj.length) | 0; + that = createBuffer$1(that, len); - if (array.byteLength < byteOffset + (length || 0)) { - throw new RangeError('\'length\' is out of bounds') - } + if (that.length === 0) { + return that + } - if (byteOffset === undefined && length === undefined) { - array = new Uint8Array(array); - } else if (length === undefined) { - array = new Uint8Array(array, byteOffset); - } else { - array = new Uint8Array(array, byteOffset, length); - } + obj.copy(that, 0, 0, len); + return that + } - if (Buffer$1.TYPED_ARRAY_SUPPORT) { - // Return an augmented `Uint8Array` instance, for best performance - that = array; - that.__proto__ = Buffer$1.prototype; - } else { - // Fallback: Return an object instance of the Buffer class - that = fromArrayLike$1(that, array); - } - return that - } + if (obj) { + if ((typeof ArrayBuffer !== 'undefined' && + obj.buffer instanceof ArrayBuffer) || 'length' in obj) { + if (typeof obj.length !== 'number' || isnan$1(obj.length)) { + return createBuffer$1(that, 0) + } + return fromArrayLike$1(that, obj) + } - function fromObject$1 (that, obj) { - if (internalIsBuffer$1(obj)) { - var len = checked$1(obj.length) | 0; - that = createBuffer$1(that, len); + if (obj.type === 'Buffer' && isArray(obj.data)) { + return fromArrayLike$1(that, obj.data) + } + } - if (that.length === 0) { - return that + throw new TypeError('First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.') } - obj.copy(that, 0, 0, len); - return that - } - - if (obj) { - if ((typeof ArrayBuffer !== 'undefined' && - obj.buffer instanceof ArrayBuffer) || 'length' in obj) { - if (typeof obj.length !== 'number' || isnan$1(obj.length)) { - return createBuffer$1(that, 0) + function checked$1 (length) { + // Note: cannot use `length < kMaxLength()` here because that fails when + // length is NaN (which is otherwise coerced to zero.) + if (length >= kMaxLength$1()) { + throw new RangeError('Attempt to allocate Buffer larger than maximum ' + + 'size: 0x' + kMaxLength$1().toString(16) + ' bytes') } - return fromArrayLike$1(that, obj) + return length | 0 } - - if (obj.type === 'Buffer' && isArray(obj.data)) { - return fromArrayLike$1(that, obj.data) + Buffer$1.isBuffer = isBuffer$1; + function internalIsBuffer$1 (b) { + return !!(b != null && b._isBuffer) } - } - throw new TypeError('First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.') - } + Buffer$1.compare = function compare (a, b) { + if (!internalIsBuffer$1(a) || !internalIsBuffer$1(b)) { + throw new TypeError('Arguments must be Buffers') + } - function checked$1 (length) { - // Note: cannot use `length < kMaxLength()` here because that fails when - // length is NaN (which is otherwise coerced to zero.) - if (length >= kMaxLength$1()) { - throw new RangeError('Attempt to allocate Buffer larger than maximum ' + - 'size: 0x' + kMaxLength$1().toString(16) + ' bytes') - } - return length | 0 - } - Buffer$1.isBuffer = isBuffer$1; - function internalIsBuffer$1 (b) { - return !!(b != null && b._isBuffer) - } + if (a === b) return 0 - Buffer$1.compare = function compare (a, b) { - if (!internalIsBuffer$1(a) || !internalIsBuffer$1(b)) { - throw new TypeError('Arguments must be Buffers') - } + var x = a.length; + var y = b.length; - if (a === b) return 0 + for (var i = 0, len = Math.min(x, y); i < len; ++i) { + if (a[i] !== b[i]) { + x = a[i]; + y = b[i]; + break + } + } - var x = a.length; - var y = b.length; + if (x < y) return -1 + if (y < x) return 1 + return 0 + }; - for (var i = 0, len = Math.min(x, y); i < len; ++i) { - if (a[i] !== b[i]) { - x = a[i]; - y = b[i]; - break - } - } + Buffer$1.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 true + default: + return false + } + }; - if (x < y) return -1 - if (y < x) return 1 - return 0 - }; + Buffer$1.concat = function concat (list, length) { + if (!isArray(list)) { + throw new TypeError('"list" argument must be an Array of Buffers') + } - Buffer$1.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 true - default: - return false - } - }; + if (list.length === 0) { + return Buffer$1.alloc(0) + } - Buffer$1.concat = function concat (list, length) { - if (!isArray(list)) { - throw new TypeError('"list" argument must be an Array of Buffers') - } + var i; + if (length === undefined) { + length = 0; + for (i = 0; i < list.length; ++i) { + length += list[i].length; + } + } - if (list.length === 0) { - return Buffer$1.alloc(0) - } + var buffer = Buffer$1.allocUnsafe(length); + var pos = 0; + for (i = 0; i < list.length; ++i) { + var buf = list[i]; + if (!internalIsBuffer$1(buf)) { + throw new TypeError('"list" argument must be an Array of Buffers') + } + buf.copy(buffer, pos); + pos += buf.length; + } + return buffer + }; - var i; - if (length === undefined) { - length = 0; - for (i = 0; i < list.length; ++i) { - length += list[i].length; - } - } + function byteLength$1 (string, encoding) { + if (internalIsBuffer$1(string)) { + return string.length + } + if (typeof ArrayBuffer !== 'undefined' && typeof ArrayBuffer.isView === 'function' && + (ArrayBuffer.isView(string) || string instanceof ArrayBuffer)) { + return string.byteLength + } + if (typeof string !== 'string') { + string = '' + string; + } - var buffer = Buffer$1.allocUnsafe(length); - var pos = 0; - for (i = 0; i < list.length; ++i) { - var buf = list[i]; - if (!internalIsBuffer$1(buf)) { - throw new TypeError('"list" argument must be an Array of Buffers') + var len = string.length; + if (len === 0) return 0 + + // Use a for loop to avoid recursion + var loweredCase = false; + for (;;) { + switch (encoding) { + case 'ascii': + case 'latin1': + case 'binary': + return len + case 'utf8': + case 'utf-8': + case undefined: + return utf8ToBytes$1(string).length + case 'ucs2': + case 'ucs-2': + case 'utf16le': + case 'utf-16le': + return len * 2 + case 'hex': + return len >>> 1 + case 'base64': + return base64ToBytes$1(string).length + default: + if (loweredCase) return utf8ToBytes$1(string).length // assume utf8 + encoding = ('' + encoding).toLowerCase(); + loweredCase = true; + } + } } - buf.copy(buffer, pos); - pos += buf.length; - } - return buffer - }; + Buffer$1.byteLength = byteLength$1; - function byteLength$1 (string, encoding) { - if (internalIsBuffer$1(string)) { - return string.length - } - if (typeof ArrayBuffer !== 'undefined' && typeof ArrayBuffer.isView === 'function' && - (ArrayBuffer.isView(string) || string instanceof ArrayBuffer)) { - return string.byteLength - } - if (typeof string !== 'string') { - string = '' + string; - } + function slowToString$1 (encoding, start, end) { + var loweredCase = false; - var len = string.length; - if (len === 0) return 0 - - // Use a for loop to avoid recursion - var loweredCase = false; - for (;;) { - switch (encoding) { - case 'ascii': - case 'latin1': - case 'binary': - return len - case 'utf8': - case 'utf-8': - case undefined: - return utf8ToBytes$1(string).length - case 'ucs2': - case 'ucs-2': - case 'utf16le': - case 'utf-16le': - return len * 2 - case 'hex': - return len >>> 1 - case 'base64': - return base64ToBytes$1(string).length - default: - if (loweredCase) return utf8ToBytes$1(string).length // assume utf8 - encoding = ('' + encoding).toLowerCase(); - loweredCase = true; - } - } - } - Buffer$1.byteLength = byteLength$1; + // No need to verify that "this.length <= MAX_UINT32" since it's a read-only + // property of a typed array. - function slowToString$1 (encoding, start, end) { - var loweredCase = false; + // 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 '' + } - // No need to verify that "this.length <= MAX_UINT32" since it's a read-only - // property of a typed array. + if (end === undefined || end > this.length) { + end = this.length; + } - // 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 <= 0) { + return '' + } - if (end === undefined || end > this.length) { - end = this.length; - } + // Force coersion to uint32. This will also coerce falsey/NaN values to 0. + end >>>= 0; + start >>>= 0; - if (end <= 0) { - return '' - } + if (end <= start) { + return '' + } - // Force coersion to uint32. This will also coerce falsey/NaN values to 0. - end >>>= 0; - start >>>= 0; + if (!encoding) encoding = 'utf8'; - if (end <= start) { - return '' - } + while (true) { + switch (encoding) { + case 'hex': + return hexSlice$1(this, start, end) - if (!encoding) encoding = 'utf8'; + case 'utf8': + case 'utf-8': + return utf8Slice$1(this, start, end) - while (true) { - switch (encoding) { - case 'hex': - return hexSlice$1(this, start, end) + case 'ascii': + return asciiSlice$1(this, start, end) - case 'utf8': - case 'utf-8': - return utf8Slice$1(this, start, end) + case 'latin1': + case 'binary': + return latin1Slice$1(this, start, end) - case 'ascii': - return asciiSlice$1(this, start, end) + case 'base64': + return base64Slice$1(this, start, end) - case 'latin1': - case 'binary': - return latin1Slice$1(this, start, end) + case 'ucs2': + case 'ucs-2': + case 'utf16le': + case 'utf-16le': + return utf16leSlice$1(this, start, end) - case 'base64': - return base64Slice$1(this, start, end) + default: + if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding) + encoding = (encoding + '').toLowerCase(); + loweredCase = true; + } + } + } - case 'ucs2': - case 'ucs-2': - case 'utf16le': - case 'utf-16le': - return utf16leSlice$1(this, start, end) + // The property is used by `Buffer.isBuffer` and `is-buffer` (in Safari 5-7) to detect + // Buffer instances. + Buffer$1.prototype._isBuffer = true; - default: - if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding) - encoding = (encoding + '').toLowerCase(); - loweredCase = true; + function swap$1 (b, n, m) { + var i = b[n]; + b[n] = b[m]; + b[m] = i; } - } - } - // The property is used by `Buffer.isBuffer` and `is-buffer` (in Safari 5-7) to detect - // Buffer instances. - Buffer$1.prototype._isBuffer = true; + Buffer$1.prototype.swap16 = function swap16 () { + var len = this.length; + if (len % 2 !== 0) { + throw new RangeError('Buffer size must be a multiple of 16-bits') + } + for (var i = 0; i < len; i += 2) { + swap$1(this, i, i + 1); + } + return this + }; - function swap$1 (b, n, m) { - var i = b[n]; - b[n] = b[m]; - b[m] = i; - } + Buffer$1.prototype.swap32 = function swap32 () { + var len = this.length; + if (len % 4 !== 0) { + throw new RangeError('Buffer size must be a multiple of 32-bits') + } + for (var i = 0; i < len; i += 4) { + swap$1(this, i, i + 3); + swap$1(this, i + 1, i + 2); + } + return this + }; - Buffer$1.prototype.swap16 = function swap16 () { - var len = this.length; - if (len % 2 !== 0) { - throw new RangeError('Buffer size must be a multiple of 16-bits') - } - for (var i = 0; i < len; i += 2) { - swap$1(this, i, i + 1); - } - return this - }; + Buffer$1.prototype.swap64 = function swap64 () { + var len = this.length; + if (len % 8 !== 0) { + throw new RangeError('Buffer size must be a multiple of 64-bits') + } + for (var i = 0; i < len; i += 8) { + swap$1(this, i, i + 7); + swap$1(this, i + 1, i + 6); + swap$1(this, i + 2, i + 5); + swap$1(this, i + 3, i + 4); + } + return this + }; - Buffer$1.prototype.swap32 = function swap32 () { - var len = this.length; - if (len % 4 !== 0) { - throw new RangeError('Buffer size must be a multiple of 32-bits') - } - for (var i = 0; i < len; i += 4) { - swap$1(this, i, i + 3); - swap$1(this, i + 1, i + 2); - } - return this - }; + Buffer$1.prototype.toString = function toString () { + var length = this.length | 0; + if (length === 0) return '' + if (arguments.length === 0) return utf8Slice$1(this, 0, length) + return slowToString$1.apply(this, arguments) + }; - Buffer$1.prototype.swap64 = function swap64 () { - var len = this.length; - if (len % 8 !== 0) { - throw new RangeError('Buffer size must be a multiple of 64-bits') - } - for (var i = 0; i < len; i += 8) { - swap$1(this, i, i + 7); - swap$1(this, i + 1, i + 6); - swap$1(this, i + 2, i + 5); - swap$1(this, i + 3, i + 4); - } - return this - }; + Buffer$1.prototype.equals = function equals (b) { + if (!internalIsBuffer$1(b)) throw new TypeError('Argument must be a Buffer') + if (this === b) return true + return Buffer$1.compare(this, b) === 0 + }; - Buffer$1.prototype.toString = function toString () { - var length = this.length | 0; - if (length === 0) return '' - if (arguments.length === 0) return utf8Slice$1(this, 0, length) - return slowToString$1.apply(this, arguments) - }; + Buffer$1.prototype.inspect = function inspect () { + var str = ''; + var max = INSPECT_MAX_BYTES$1; + if (this.length > 0) { + str = this.toString('hex', 0, max).match(/.{2}/g).join(' '); + if (this.length > max) str += ' ... '; + } + return '<Buffer ' + str + '>' + }; - Buffer$1.prototype.equals = function equals (b) { - if (!internalIsBuffer$1(b)) throw new TypeError('Argument must be a Buffer') - if (this === b) return true - return Buffer$1.compare(this, b) === 0 - }; + Buffer$1.prototype.compare = function compare (target, start, end, thisStart, thisEnd) { + if (!internalIsBuffer$1(target)) { + throw new TypeError('Argument must be a Buffer') + } - Buffer$1.prototype.inspect = function inspect () { - var str = ''; - var max = INSPECT_MAX_BYTES$1; - if (this.length > 0) { - str = this.toString('hex', 0, max).match(/.{2}/g).join(' '); - if (this.length > max) str += ' ... '; - } - return '<Buffer ' + str + '>' - }; + if (start === undefined) { + start = 0; + } + if (end === undefined) { + end = target ? target.length : 0; + } + if (thisStart === undefined) { + thisStart = 0; + } + if (thisEnd === undefined) { + thisEnd = this.length; + } - Buffer$1.prototype.compare = function compare (target, start, end, thisStart, thisEnd) { - if (!internalIsBuffer$1(target)) { - throw new TypeError('Argument must be a Buffer') - } + if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) { + throw new RangeError('out of range index') + } - 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 (thisStart >= thisEnd && start >= end) { + return 0 + } + if (thisStart >= thisEnd) { + return -1 + } + if (start >= end) { + return 1 + } - if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) { - throw new RangeError('out of range index') - } + start >>>= 0; + end >>>= 0; + thisStart >>>= 0; + thisEnd >>>= 0; - if (thisStart >= thisEnd && start >= end) { - return 0 - } - if (thisStart >= thisEnd) { - return -1 - } - if (start >= end) { - return 1 - } + if (this === target) return 0 - start >>>= 0; - end >>>= 0; - thisStart >>>= 0; - thisEnd >>>= 0; + var x = thisEnd - thisStart; + var y = end - start; + var len = Math.min(x, y); - if (this === target) return 0 + var thisCopy = this.slice(thisStart, thisEnd); + var targetCopy = target.slice(start, end); - var x = thisEnd - thisStart; - var y = end - start; - var len = Math.min(x, y); + for (var i = 0; i < len; ++i) { + if (thisCopy[i] !== targetCopy[i]) { + x = thisCopy[i]; + y = targetCopy[i]; + break + } + } - var thisCopy = this.slice(thisStart, thisEnd); - var targetCopy = target.slice(start, end); + 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$1 (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 (isNaN(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$1.from(val, encoding); + } + + // Finally, search either indexOf (if dir is true) or lastIndexOf + if (internalIsBuffer$1(val)) { + // Special case: looking for empty string/buffer always fails + if (val.length === 0) { + return -1 + } + return arrayIndexOf$1(buffer, val, byteOffset, encoding, dir) + } else if (typeof val === 'number') { + val = val & 0xFF; // Search for a byte value [0-255] + if (Buffer$1.TYPED_ARRAY_SUPPORT && + 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$1(buffer, [ val ], byteOffset, encoding, dir) + } - for (var i = 0; i < len; ++i) { - if (thisCopy[i] !== targetCopy[i]) { - x = thisCopy[i]; - y = targetCopy[i]; - break + throw new TypeError('val must be string, number or Buffer') } - } - if (x < y) return -1 - if (y < x) return 1 - return 0 - }; + function arrayIndexOf$1 (arr, val, byteOffset, encoding, dir) { + var indexSize = 1; + var arrLength = arr.length; + var valLength = val.length; - // 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$1 (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 (isNaN(byteOffset)) { - // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer - byteOffset = dir ? 0 : (buffer.length - 1); - } + 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; + } + } - // 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 - } + function read (buf, i) { + if (indexSize === 1) { + return buf[i] + } else { + return buf.readUInt16BE(i * indexSize) + } + } - // Normalize val - if (typeof val === 'string') { - val = Buffer$1.from(val, encoding); - } + var i; + if (dir) { + var 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--) { + var found = true; + for (var j = 0; j < valLength; j++) { + if (read(arr, i + j) !== read(val, j)) { + found = false; + break + } + } + if (found) return i + } + } - // Finally, search either indexOf (if dir is true) or lastIndexOf - if (internalIsBuffer$1(val)) { - // Special case: looking for empty string/buffer always fails - if (val.length === 0) { return -1 } - return arrayIndexOf$1(buffer, val, byteOffset, encoding, dir) - } else if (typeof val === 'number') { - val = val & 0xFF; // Search for a byte value [0-255] - if (Buffer$1.TYPED_ARRAY_SUPPORT && - typeof Uint8Array.prototype.indexOf === 'function') { - if (dir) { - return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset) + + Buffer$1.prototype.includes = function includes (val, byteOffset, encoding) { + return this.indexOf(val, byteOffset, encoding) !== -1 + }; + + Buffer$1.prototype.indexOf = function indexOf (val, byteOffset, encoding) { + return bidirectionalIndexOf$1(this, val, byteOffset, encoding, true) + }; + + Buffer$1.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) { + return bidirectionalIndexOf$1(this, val, byteOffset, encoding, false) + }; + + function hexWrite$1 (buf, string, offset, length) { + offset = Number(offset) || 0; + var remaining = buf.length - offset; + if (!length) { + length = remaining; } else { - return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset) + length = Number(length); + if (length > remaining) { + length = remaining; + } + } + + // must be an even number of digits + var strLen = string.length; + if (strLen % 2 !== 0) throw new TypeError('Invalid hex string') + + if (length > strLen / 2) { + length = strLen / 2; + } + for (var i = 0; i < length; ++i) { + var parsed = parseInt(string.substr(i * 2, 2), 16); + if (isNaN(parsed)) return i + buf[offset + i] = parsed; } + return i } - return arrayIndexOf$1(buffer, [ val ], byteOffset, encoding, dir) - } - throw new TypeError('val must be string, number or Buffer') - } + function utf8Write$1 (buf, string, offset, length) { + return blitBuffer$1(utf8ToBytes$1(string, buf.length - offset), buf, offset, length) + } - function arrayIndexOf$1 (arr, val, byteOffset, encoding, dir) { - var indexSize = 1; - var arrLength = arr.length; - var valLength = val.length; + function asciiWrite$1 (buf, string, offset, length) { + return blitBuffer$1(asciiToBytes$1(string), buf, offset, 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 latin1Write$1 (buf, string, offset, length) { + return asciiWrite$1(buf, string, offset, length) } - } - function read (buf, i) { - if (indexSize === 1) { - return buf[i] - } else { - return buf.readUInt16BE(i * indexSize) + function base64Write$1 (buf, string, offset, length) { + return blitBuffer$1(base64ToBytes$1(string), buf, offset, length) } - } - var i; - if (dir) { - var 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; - } + function ucs2Write$1 (buf, string, offset, length) { + return blitBuffer$1(utf16leToBytes$1(string, buf.length - offset), buf, offset, length) } - } else { - if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength; - for (i = byteOffset; i >= 0; i--) { - var found = true; - for (var j = 0; j < valLength; j++) { - if (read(arr, i + j) !== read(val, j)) { - found = false; - break + + Buffer$1.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; } + // legacy write(string, encoding, offset, length) - remove in v0.13 + } else { + throw new Error( + 'Buffer.write(string, encoding, offset[, length]) is no longer supported' + ) } - if (found) return i - } - } - - return -1 - } - Buffer$1.prototype.includes = function includes (val, byteOffset, encoding) { - return this.indexOf(val, byteOffset, encoding) !== -1 - }; + var remaining = this.length - offset; + if (length === undefined || length > remaining) length = remaining; - Buffer$1.prototype.indexOf = function indexOf (val, byteOffset, encoding) { - return bidirectionalIndexOf$1(this, val, byteOffset, encoding, true) - }; + if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) { + throw new RangeError('Attempt to write outside buffer bounds') + } - Buffer$1.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) { - return bidirectionalIndexOf$1(this, val, byteOffset, encoding, false) - }; + if (!encoding) encoding = 'utf8'; - function hexWrite$1 (buf, string, offset, length) { - offset = Number(offset) || 0; - var remaining = buf.length - offset; - if (!length) { - length = remaining; - } else { - length = Number(length); - if (length > remaining) { - length = remaining; - } - } + var loweredCase = false; + for (;;) { + switch (encoding) { + case 'hex': + return hexWrite$1(this, string, offset, length) - // must be an even number of digits - var strLen = string.length; - if (strLen % 2 !== 0) throw new TypeError('Invalid hex string') + case 'utf8': + case 'utf-8': + return utf8Write$1(this, string, offset, length) - if (length > strLen / 2) { - length = strLen / 2; - } - for (var i = 0; i < length; ++i) { - var parsed = parseInt(string.substr(i * 2, 2), 16); - if (isNaN(parsed)) return i - buf[offset + i] = parsed; - } - return i - } + case 'ascii': + return asciiWrite$1(this, string, offset, length) - function utf8Write$1 (buf, string, offset, length) { - return blitBuffer$1(utf8ToBytes$1(string, buf.length - offset), buf, offset, length) - } + case 'latin1': + case 'binary': + return latin1Write$1(this, string, offset, length) - function asciiWrite$1 (buf, string, offset, length) { - return blitBuffer$1(asciiToBytes$1(string), buf, offset, length) - } + case 'base64': + // Warning: maxLength not taken into account in base64Write + return base64Write$1(this, string, offset, length) - function latin1Write$1 (buf, string, offset, length) { - return asciiWrite$1(buf, string, offset, length) - } + case 'ucs2': + case 'ucs-2': + case 'utf16le': + case 'utf-16le': + return ucs2Write$1(this, string, offset, length) - function base64Write$1 (buf, string, offset, length) { - return blitBuffer$1(base64ToBytes$1(string), buf, offset, length) - } + default: + if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding) + encoding = ('' + encoding).toLowerCase(); + loweredCase = true; + } + } + }; - function ucs2Write$1 (buf, string, offset, length) { - return blitBuffer$1(utf16leToBytes$1(string, buf.length - offset), buf, offset, length) - } + Buffer$1.prototype.toJSON = function toJSON () { + return { + type: 'Buffer', + data: Array.prototype.slice.call(this._arr || this, 0) + } + }; - Buffer$1.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; - } - // legacy write(string, encoding, offset, length) - remove in v0.13 - } else { - throw new Error( - 'Buffer.write(string, encoding, offset[, length]) is no longer supported' - ) - } + function base64Slice$1 (buf, start, end) { + if (start === 0 && end === buf.length) { + return fromByteArray(buf) + } else { + return fromByteArray(buf.slice(start, end)) + } + } - var remaining = this.length - offset; - if (length === undefined || length > remaining) length = remaining; + function utf8Slice$1 (buf, start, end) { + end = Math.min(buf.length, end); + var res = []; - if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) { - throw new RangeError('Attempt to write outside buffer bounds') - } + var i = start; + while (i < end) { + var firstByte = buf[i]; + var codePoint = null; + var bytesPerSequence = (firstByte > 0xEF) ? 4 + : (firstByte > 0xDF) ? 3 + : (firstByte > 0xBF) ? 2 + : 1; - if (!encoding) encoding = 'utf8'; + if (i + bytesPerSequence <= end) { + var secondByte, thirdByte, fourthByte, tempCodePoint; - var loweredCase = false; - for (;;) { - switch (encoding) { - case 'hex': - return hexWrite$1(this, string, offset, length) + 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; + } + } + } + } - case 'utf8': - case 'utf-8': - return utf8Write$1(this, string, offset, length) + 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; + } - case 'ascii': - return asciiWrite$1(this, string, offset, length) + res.push(codePoint); + i += bytesPerSequence; + } - case 'latin1': - case 'binary': - return latin1Write$1(this, string, offset, length) + return decodeCodePointsArray$1(res) + } - case 'base64': - // Warning: maxLength not taken into account in base64Write - return base64Write$1(this, string, offset, length) + // 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 + var MAX_ARGUMENTS_LENGTH$1 = 0x1000; - case 'ucs2': - case 'ucs-2': - case 'utf16le': - case 'utf-16le': - return ucs2Write$1(this, string, offset, length) + function decodeCodePointsArray$1 (codePoints) { + var len = codePoints.length; + if (len <= MAX_ARGUMENTS_LENGTH$1) { + return String.fromCharCode.apply(String, codePoints) // avoid extra slice() + } - default: - if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding) - encoding = ('' + encoding).toLowerCase(); - loweredCase = true; + // Decode in chunks to avoid "call stack size exceeded". + var res = ''; + var i = 0; + while (i < len) { + res += String.fromCharCode.apply( + String, + codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH$1) + ); + } + return res } - } - }; - Buffer$1.prototype.toJSON = function toJSON () { - return { - type: 'Buffer', - data: Array.prototype.slice.call(this._arr || this, 0) - } - }; + function asciiSlice$1 (buf, start, end) { + var ret = ''; + end = Math.min(buf.length, end); - function base64Slice$1 (buf, start, end) { - if (start === 0 && end === buf.length) { - return fromByteArray(buf) - } else { - return fromByteArray(buf.slice(start, end)) - } - } + for (var i = start; i < end; ++i) { + ret += String.fromCharCode(buf[i] & 0x7F); + } + return ret + } - function utf8Slice$1 (buf, start, end) { - end = Math.min(buf.length, end); - var res = []; + function latin1Slice$1 (buf, start, end) { + var ret = ''; + end = Math.min(buf.length, end); - var i = start; - while (i < end) { - var firstByte = buf[i]; - var codePoint = null; - var bytesPerSequence = (firstByte > 0xEF) ? 4 - : (firstByte > 0xDF) ? 3 - : (firstByte > 0xBF) ? 2 - : 1; + for (var i = start; i < end; ++i) { + ret += String.fromCharCode(buf[i]); + } + return ret + } - if (i + bytesPerSequence <= end) { - var secondByte, thirdByte, fourthByte, tempCodePoint; + function hexSlice$1 (buf, start, end) { + var len = buf.length; - 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 (!start || start < 0) start = 0; + if (!end || end < 0 || end > len) end = len; + + var out = ''; + for (var i = start; i < end; ++i) { + out += toHex$1(buf[i]); } + return out } - 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; + function utf16leSlice$1 (buf, start, end) { + var bytes = buf.slice(start, end); + var res = ''; + for (var i = 0; i < bytes.length; i += 2) { + res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256); + } + return res } - res.push(codePoint); - i += bytesPerSequence; - } + Buffer$1.prototype.slice = function slice (start, end) { + var len = this.length; + start = ~~start; + end = end === undefined ? len : ~~end; - return decodeCodePointsArray$1(res) - } + if (start < 0) { + start += len; + if (start < 0) start = 0; + } else if (start > len) { + start = len; + } - // 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 - var MAX_ARGUMENTS_LENGTH$1 = 0x1000; + if (end < 0) { + end += len; + if (end < 0) end = 0; + } else if (end > len) { + end = len; + } - function decodeCodePointsArray$1 (codePoints) { - var len = codePoints.length; - if (len <= MAX_ARGUMENTS_LENGTH$1) { - return String.fromCharCode.apply(String, codePoints) // avoid extra slice() - } + if (end < start) end = start; - // Decode in chunks to avoid "call stack size exceeded". - var res = ''; - var i = 0; - while (i < len) { - res += String.fromCharCode.apply( - String, - codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH$1) - ); - } - return res - } + var newBuf; + if (Buffer$1.TYPED_ARRAY_SUPPORT) { + newBuf = this.subarray(start, end); + newBuf.__proto__ = Buffer$1.prototype; + } else { + var sliceLen = end - start; + newBuf = new Buffer$1(sliceLen, undefined); + for (var i = 0; i < sliceLen; ++i) { + newBuf[i] = this[i + start]; + } + } - function asciiSlice$1 (buf, start, end) { - var ret = ''; - end = Math.min(buf.length, end); + return newBuf + }; - for (var i = start; i < end; ++i) { - ret += String.fromCharCode(buf[i] & 0x7F); - } - return ret - } + /* + * Need to make sure that buffer isn't trying to write out of bounds. + */ + function checkOffset$1 (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') + } - function latin1Slice$1 (buf, start, end) { - var ret = ''; - end = Math.min(buf.length, end); + Buffer$1.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) { + offset = offset | 0; + byteLength = byteLength | 0; + if (!noAssert) checkOffset$1(offset, byteLength, this.length); - for (var i = start; i < end; ++i) { - ret += String.fromCharCode(buf[i]); - } - return ret - } + var val = this[offset]; + var mul = 1; + var i = 0; + while (++i < byteLength && (mul *= 0x100)) { + val += this[offset + i] * mul; + } - function hexSlice$1 (buf, start, end) { - var len = buf.length; + return val + }; - if (!start || start < 0) start = 0; - if (!end || end < 0 || end > len) end = len; + Buffer$1.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) { + offset = offset | 0; + byteLength = byteLength | 0; + if (!noAssert) { + checkOffset$1(offset, byteLength, this.length); + } - var out = ''; - for (var i = start; i < end; ++i) { - out += toHex$1(buf[i]); - } - return out - } + var val = this[offset + --byteLength]; + var mul = 1; + while (byteLength > 0 && (mul *= 0x100)) { + val += this[offset + --byteLength] * mul; + } - function utf16leSlice$1 (buf, start, end) { - var bytes = buf.slice(start, end); - var res = ''; - for (var i = 0; i < bytes.length; i += 2) { - res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256); - } - return res - } + return val + }; - Buffer$1.prototype.slice = function slice (start, end) { - var len = this.length; - start = ~~start; - end = end === undefined ? len : ~~end; + Buffer$1.prototype.readUInt8 = function readUInt8 (offset, noAssert) { + if (!noAssert) checkOffset$1(offset, 1, this.length); + return this[offset] + }; - if (start < 0) { - start += len; - if (start < 0) start = 0; - } else if (start > len) { - start = len; - } + Buffer$1.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) { + if (!noAssert) checkOffset$1(offset, 2, this.length); + return this[offset] | (this[offset + 1] << 8) + }; - if (end < 0) { - end += len; - if (end < 0) end = 0; - } else if (end > len) { - end = len; - } + Buffer$1.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) { + if (!noAssert) checkOffset$1(offset, 2, this.length); + return (this[offset] << 8) | this[offset + 1] + }; - if (end < start) end = start; + Buffer$1.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) { + if (!noAssert) checkOffset$1(offset, 4, this.length); - var newBuf; - if (Buffer$1.TYPED_ARRAY_SUPPORT) { - newBuf = this.subarray(start, end); - newBuf.__proto__ = Buffer$1.prototype; - } else { - var sliceLen = end - start; - newBuf = new Buffer$1(sliceLen, undefined); - for (var i = 0; i < sliceLen; ++i) { - newBuf[i] = this[i + start]; - } - } + return ((this[offset]) | + (this[offset + 1] << 8) | + (this[offset + 2] << 16)) + + (this[offset + 3] * 0x1000000) + }; - return newBuf - }; + Buffer$1.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) { + if (!noAssert) checkOffset$1(offset, 4, this.length); - /* - * Need to make sure that buffer isn't trying to write out of bounds. - */ - function checkOffset$1 (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') - } + return (this[offset] * 0x1000000) + + ((this[offset + 1] << 16) | + (this[offset + 2] << 8) | + this[offset + 3]) + }; - Buffer$1.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) { - offset = offset | 0; - byteLength = byteLength | 0; - if (!noAssert) checkOffset$1(offset, byteLength, this.length); + Buffer$1.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) { + offset = offset | 0; + byteLength = byteLength | 0; + if (!noAssert) checkOffset$1(offset, byteLength, this.length); - var val = this[offset]; - var mul = 1; - var i = 0; - while (++i < byteLength && (mul *= 0x100)) { - val += this[offset + i] * mul; - } + var val = this[offset]; + var mul = 1; + var i = 0; + while (++i < byteLength && (mul *= 0x100)) { + val += this[offset + i] * mul; + } + mul *= 0x80; - return val - }; + if (val >= mul) val -= Math.pow(2, 8 * byteLength); - Buffer$1.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) { - offset = offset | 0; - byteLength = byteLength | 0; - if (!noAssert) { - checkOffset$1(offset, byteLength, this.length); - } + return val + }; - var val = this[offset + --byteLength]; - var mul = 1; - while (byteLength > 0 && (mul *= 0x100)) { - val += this[offset + --byteLength] * mul; - } + Buffer$1.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) { + offset = offset | 0; + byteLength = byteLength | 0; + if (!noAssert) checkOffset$1(offset, byteLength, this.length); - return val - }; + var i = byteLength; + var mul = 1; + var val = this[offset + --i]; + while (i > 0 && (mul *= 0x100)) { + val += this[offset + --i] * mul; + } + mul *= 0x80; - Buffer$1.prototype.readUInt8 = function readUInt8 (offset, noAssert) { - if (!noAssert) checkOffset$1(offset, 1, this.length); - return this[offset] - }; + if (val >= mul) val -= Math.pow(2, 8 * byteLength); - Buffer$1.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) { - if (!noAssert) checkOffset$1(offset, 2, this.length); - return this[offset] | (this[offset + 1] << 8) - }; + return val + }; - Buffer$1.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) { - if (!noAssert) checkOffset$1(offset, 2, this.length); - return (this[offset] << 8) | this[offset + 1] - }; + Buffer$1.prototype.readInt8 = function readInt8 (offset, noAssert) { + if (!noAssert) checkOffset$1(offset, 1, this.length); + if (!(this[offset] & 0x80)) return (this[offset]) + return ((0xff - this[offset] + 1) * -1) + }; - Buffer$1.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) { - if (!noAssert) checkOffset$1(offset, 4, this.length); + Buffer$1.prototype.readInt16LE = function readInt16LE (offset, noAssert) { + if (!noAssert) checkOffset$1(offset, 2, this.length); + var val = this[offset] | (this[offset + 1] << 8); + return (val & 0x8000) ? val | 0xFFFF0000 : val + }; - return ((this[offset]) | - (this[offset + 1] << 8) | - (this[offset + 2] << 16)) + - (this[offset + 3] * 0x1000000) - }; + Buffer$1.prototype.readInt16BE = function readInt16BE (offset, noAssert) { + if (!noAssert) checkOffset$1(offset, 2, this.length); + var val = this[offset + 1] | (this[offset] << 8); + return (val & 0x8000) ? val | 0xFFFF0000 : val + }; - Buffer$1.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) { - if (!noAssert) checkOffset$1(offset, 4, this.length); + Buffer$1.prototype.readInt32LE = function readInt32LE (offset, noAssert) { + if (!noAssert) checkOffset$1(offset, 4, this.length); - return (this[offset] * 0x1000000) + - ((this[offset + 1] << 16) | - (this[offset + 2] << 8) | - this[offset + 3]) - }; + return (this[offset]) | + (this[offset + 1] << 8) | + (this[offset + 2] << 16) | + (this[offset + 3] << 24) + }; - Buffer$1.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) { - offset = offset | 0; - byteLength = byteLength | 0; - if (!noAssert) checkOffset$1(offset, byteLength, this.length); + Buffer$1.prototype.readInt32BE = function readInt32BE (offset, noAssert) { + if (!noAssert) checkOffset$1(offset, 4, this.length); - var val = this[offset]; - var mul = 1; - var i = 0; - while (++i < byteLength && (mul *= 0x100)) { - val += this[offset + i] * mul; - } - mul *= 0x80; + return (this[offset] << 24) | + (this[offset + 1] << 16) | + (this[offset + 2] << 8) | + (this[offset + 3]) + }; - if (val >= mul) val -= Math.pow(2, 8 * byteLength); + Buffer$1.prototype.readFloatLE = function readFloatLE (offset, noAssert) { + if (!noAssert) checkOffset$1(offset, 4, this.length); + return read(this, offset, true, 23, 4) + }; - return val - }; + Buffer$1.prototype.readFloatBE = function readFloatBE (offset, noAssert) { + if (!noAssert) checkOffset$1(offset, 4, this.length); + return read(this, offset, false, 23, 4) + }; - Buffer$1.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) { - offset = offset | 0; - byteLength = byteLength | 0; - if (!noAssert) checkOffset$1(offset, byteLength, this.length); + Buffer$1.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) { + if (!noAssert) checkOffset$1(offset, 8, this.length); + return read(this, offset, true, 52, 8) + }; - var i = byteLength; - var mul = 1; - var val = this[offset + --i]; - while (i > 0 && (mul *= 0x100)) { - val += this[offset + --i] * mul; - } - mul *= 0x80; + Buffer$1.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) { + if (!noAssert) checkOffset$1(offset, 8, this.length); + return read(this, offset, false, 52, 8) + }; - if (val >= mul) val -= Math.pow(2, 8 * byteLength); + function checkInt$1 (buf, value, offset, ext, max, min) { + if (!internalIsBuffer$1(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') + } - return val - }; + Buffer$1.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) { + value = +value; + offset = offset | 0; + byteLength = byteLength | 0; + if (!noAssert) { + var maxBytes = Math.pow(2, 8 * byteLength) - 1; + checkInt$1(this, value, offset, byteLength, maxBytes, 0); + } - Buffer$1.prototype.readInt8 = function readInt8 (offset, noAssert) { - if (!noAssert) checkOffset$1(offset, 1, this.length); - if (!(this[offset] & 0x80)) return (this[offset]) - return ((0xff - this[offset] + 1) * -1) - }; + var mul = 1; + var i = 0; + this[offset] = value & 0xFF; + while (++i < byteLength && (mul *= 0x100)) { + this[offset + i] = (value / mul) & 0xFF; + } - Buffer$1.prototype.readInt16LE = function readInt16LE (offset, noAssert) { - if (!noAssert) checkOffset$1(offset, 2, this.length); - var val = this[offset] | (this[offset + 1] << 8); - return (val & 0x8000) ? val | 0xFFFF0000 : val - }; + return offset + byteLength + }; - Buffer$1.prototype.readInt16BE = function readInt16BE (offset, noAssert) { - if (!noAssert) checkOffset$1(offset, 2, this.length); - var val = this[offset + 1] | (this[offset] << 8); - return (val & 0x8000) ? val | 0xFFFF0000 : val - }; + Buffer$1.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) { + value = +value; + offset = offset | 0; + byteLength = byteLength | 0; + if (!noAssert) { + var maxBytes = Math.pow(2, 8 * byteLength) - 1; + checkInt$1(this, value, offset, byteLength, maxBytes, 0); + } - Buffer$1.prototype.readInt32LE = function readInt32LE (offset, noAssert) { - if (!noAssert) checkOffset$1(offset, 4, this.length); + var i = byteLength - 1; + var mul = 1; + this[offset + i] = value & 0xFF; + while (--i >= 0 && (mul *= 0x100)) { + this[offset + i] = (value / mul) & 0xFF; + } - return (this[offset]) | - (this[offset + 1] << 8) | - (this[offset + 2] << 16) | - (this[offset + 3] << 24) - }; + return offset + byteLength + }; - Buffer$1.prototype.readInt32BE = function readInt32BE (offset, noAssert) { - if (!noAssert) checkOffset$1(offset, 4, this.length); + Buffer$1.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt$1(this, value, offset, 1, 0xff, 0); + if (!Buffer$1.TYPED_ARRAY_SUPPORT) value = Math.floor(value); + this[offset] = (value & 0xff); + return offset + 1 + }; - return (this[offset] << 24) | - (this[offset + 1] << 16) | - (this[offset + 2] << 8) | - (this[offset + 3]) - }; + function objectWriteUInt16$1 (buf, value, offset, littleEndian) { + if (value < 0) value = 0xffff + value + 1; + for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; ++i) { + buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>> + (littleEndian ? i : 1 - i) * 8; + } + } - Buffer$1.prototype.readFloatLE = function readFloatLE (offset, noAssert) { - if (!noAssert) checkOffset$1(offset, 4, this.length); - return read(this, offset, true, 23, 4) - }; + Buffer$1.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt$1(this, value, offset, 2, 0xffff, 0); + if (Buffer$1.TYPED_ARRAY_SUPPORT) { + this[offset] = (value & 0xff); + this[offset + 1] = (value >>> 8); + } else { + objectWriteUInt16$1(this, value, offset, true); + } + return offset + 2 + }; - Buffer$1.prototype.readFloatBE = function readFloatBE (offset, noAssert) { - if (!noAssert) checkOffset$1(offset, 4, this.length); - return read(this, offset, false, 23, 4) - }; + Buffer$1.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt$1(this, value, offset, 2, 0xffff, 0); + if (Buffer$1.TYPED_ARRAY_SUPPORT) { + this[offset] = (value >>> 8); + this[offset + 1] = (value & 0xff); + } else { + objectWriteUInt16$1(this, value, offset, false); + } + return offset + 2 + }; - Buffer$1.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) { - if (!noAssert) checkOffset$1(offset, 8, this.length); - return read(this, offset, true, 52, 8) - }; + function objectWriteUInt32$1 (buf, value, offset, littleEndian) { + if (value < 0) value = 0xffffffff + value + 1; + for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; ++i) { + buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff; + } + } - Buffer$1.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) { - if (!noAssert) checkOffset$1(offset, 8, this.length); - return read(this, offset, false, 52, 8) - }; + Buffer$1.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt$1(this, value, offset, 4, 0xffffffff, 0); + if (Buffer$1.TYPED_ARRAY_SUPPORT) { + this[offset + 3] = (value >>> 24); + this[offset + 2] = (value >>> 16); + this[offset + 1] = (value >>> 8); + this[offset] = (value & 0xff); + } else { + objectWriteUInt32$1(this, value, offset, true); + } + return offset + 4 + }; - function checkInt$1 (buf, value, offset, ext, max, min) { - if (!internalIsBuffer$1(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$1.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt$1(this, value, offset, 4, 0xffffffff, 0); + if (Buffer$1.TYPED_ARRAY_SUPPORT) { + this[offset] = (value >>> 24); + this[offset + 1] = (value >>> 16); + this[offset + 2] = (value >>> 8); + this[offset + 3] = (value & 0xff); + } else { + objectWriteUInt32$1(this, value, offset, false); + } + return offset + 4 + }; - Buffer$1.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) { - value = +value; - offset = offset | 0; - byteLength = byteLength | 0; - if (!noAssert) { - var maxBytes = Math.pow(2, 8 * byteLength) - 1; - checkInt$1(this, value, offset, byteLength, maxBytes, 0); - } + Buffer$1.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) { + var limit = Math.pow(2, 8 * byteLength - 1); - var mul = 1; - var i = 0; - this[offset] = value & 0xFF; - while (++i < byteLength && (mul *= 0x100)) { - this[offset + i] = (value / mul) & 0xFF; - } + checkInt$1(this, value, offset, byteLength, limit - 1, -limit); + } - return offset + byteLength - }; + var i = 0; + var mul = 1; + var 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; + } - Buffer$1.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) { - value = +value; - offset = offset | 0; - byteLength = byteLength | 0; - if (!noAssert) { - var maxBytes = Math.pow(2, 8 * byteLength) - 1; - checkInt$1(this, value, offset, byteLength, maxBytes, 0); - } + return offset + byteLength + }; - var i = byteLength - 1; - var mul = 1; - this[offset + i] = value & 0xFF; - while (--i >= 0 && (mul *= 0x100)) { - this[offset + i] = (value / mul) & 0xFF; - } + Buffer$1.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) { + var limit = Math.pow(2, 8 * byteLength - 1); - return offset + byteLength - }; + checkInt$1(this, value, offset, byteLength, limit - 1, -limit); + } - Buffer$1.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt$1(this, value, offset, 1, 0xff, 0); - if (!Buffer$1.TYPED_ARRAY_SUPPORT) value = Math.floor(value); - this[offset] = (value & 0xff); - return offset + 1 - }; + var i = byteLength - 1; + var mul = 1; + var 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; + } - function objectWriteUInt16$1 (buf, value, offset, littleEndian) { - if (value < 0) value = 0xffff + value + 1; - for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; ++i) { - buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>> - (littleEndian ? i : 1 - i) * 8; - } - } + return offset + byteLength + }; - Buffer$1.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt$1(this, value, offset, 2, 0xffff, 0); - if (Buffer$1.TYPED_ARRAY_SUPPORT) { - this[offset] = (value & 0xff); - this[offset + 1] = (value >>> 8); - } else { - objectWriteUInt16$1(this, value, offset, true); - } - return offset + 2 - }; - - Buffer$1.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt$1(this, value, offset, 2, 0xffff, 0); - if (Buffer$1.TYPED_ARRAY_SUPPORT) { - this[offset] = (value >>> 8); - this[offset + 1] = (value & 0xff); - } else { - objectWriteUInt16$1(this, value, offset, false); - } - return offset + 2 - }; - - function objectWriteUInt32$1 (buf, value, offset, littleEndian) { - if (value < 0) value = 0xffffffff + value + 1; - for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; ++i) { - buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff; - } - } + Buffer$1.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt$1(this, value, offset, 1, 0x7f, -0x80); + if (!Buffer$1.TYPED_ARRAY_SUPPORT) value = Math.floor(value); + if (value < 0) value = 0xff + value + 1; + this[offset] = (value & 0xff); + return offset + 1 + }; - Buffer$1.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt$1(this, value, offset, 4, 0xffffffff, 0); - if (Buffer$1.TYPED_ARRAY_SUPPORT) { - this[offset + 3] = (value >>> 24); - this[offset + 2] = (value >>> 16); - this[offset + 1] = (value >>> 8); - this[offset] = (value & 0xff); - } else { - objectWriteUInt32$1(this, value, offset, true); - } - return offset + 4 - }; + Buffer$1.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt$1(this, value, offset, 2, 0x7fff, -0x8000); + if (Buffer$1.TYPED_ARRAY_SUPPORT) { + this[offset] = (value & 0xff); + this[offset + 1] = (value >>> 8); + } else { + objectWriteUInt16$1(this, value, offset, true); + } + return offset + 2 + }; - Buffer$1.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt$1(this, value, offset, 4, 0xffffffff, 0); - if (Buffer$1.TYPED_ARRAY_SUPPORT) { - this[offset] = (value >>> 24); - this[offset + 1] = (value >>> 16); - this[offset + 2] = (value >>> 8); - this[offset + 3] = (value & 0xff); - } else { - objectWriteUInt32$1(this, value, offset, false); - } - return offset + 4 - }; + Buffer$1.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt$1(this, value, offset, 2, 0x7fff, -0x8000); + if (Buffer$1.TYPED_ARRAY_SUPPORT) { + this[offset] = (value >>> 8); + this[offset + 1] = (value & 0xff); + } else { + objectWriteUInt16$1(this, value, offset, false); + } + return offset + 2 + }; - Buffer$1.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) { - var limit = Math.pow(2, 8 * byteLength - 1); + Buffer$1.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt$1(this, value, offset, 4, 0x7fffffff, -0x80000000); + if (Buffer$1.TYPED_ARRAY_SUPPORT) { + this[offset] = (value & 0xff); + this[offset + 1] = (value >>> 8); + this[offset + 2] = (value >>> 16); + this[offset + 3] = (value >>> 24); + } else { + objectWriteUInt32$1(this, value, offset, true); + } + return offset + 4 + }; - checkInt$1(this, value, offset, byteLength, limit - 1, -limit); - } + Buffer$1.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) { + value = +value; + offset = offset | 0; + if (!noAssert) checkInt$1(this, value, offset, 4, 0x7fffffff, -0x80000000); + if (value < 0) value = 0xffffffff + value + 1; + if (Buffer$1.TYPED_ARRAY_SUPPORT) { + this[offset] = (value >>> 24); + this[offset + 1] = (value >>> 16); + this[offset + 2] = (value >>> 8); + this[offset + 3] = (value & 0xff); + } else { + objectWriteUInt32$1(this, value, offset, false); + } + return offset + 4 + }; - var i = 0; - var mul = 1; - var sub = 0; - this[offset] = value & 0xFF; - while (++i < byteLength && (mul *= 0x100)) { - if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) { - sub = 1; + function checkIEEE754$1 (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') } - this[offset + i] = ((value / mul) >> 0) - sub & 0xFF; - } - return offset + byteLength - }; + function writeFloat$1 (buf, value, offset, littleEndian, noAssert) { + if (!noAssert) { + checkIEEE754$1(buf, value, offset, 4); + } + write(buf, value, offset, littleEndian, 23, 4); + return offset + 4 + } - Buffer$1.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) { - var limit = Math.pow(2, 8 * byteLength - 1); + Buffer$1.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) { + return writeFloat$1(this, value, offset, true, noAssert) + }; - checkInt$1(this, value, offset, byteLength, limit - 1, -limit); - } + Buffer$1.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) { + return writeFloat$1(this, value, offset, false, noAssert) + }; - var i = byteLength - 1; - var mul = 1; - var sub = 0; - this[offset + i] = value & 0xFF; - while (--i >= 0 && (mul *= 0x100)) { - if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) { - sub = 1; + function writeDouble$1 (buf, value, offset, littleEndian, noAssert) { + if (!noAssert) { + checkIEEE754$1(buf, value, offset, 8); + } + write(buf, value, offset, littleEndian, 52, 8); + return offset + 8 } - this[offset + i] = ((value / mul) >> 0) - sub & 0xFF; - } - return offset + byteLength - }; + Buffer$1.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) { + return writeDouble$1(this, value, offset, true, noAssert) + }; - Buffer$1.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt$1(this, value, offset, 1, 0x7f, -0x80); - if (!Buffer$1.TYPED_ARRAY_SUPPORT) value = Math.floor(value); - if (value < 0) value = 0xff + value + 1; - this[offset] = (value & 0xff); - return offset + 1 - }; + Buffer$1.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) { + return writeDouble$1(this, value, offset, false, noAssert) + }; - Buffer$1.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt$1(this, value, offset, 2, 0x7fff, -0x8000); - if (Buffer$1.TYPED_ARRAY_SUPPORT) { - this[offset] = (value & 0xff); - this[offset + 1] = (value >>> 8); - } else { - objectWriteUInt16$1(this, value, offset, true); - } - return offset + 2 - }; + // copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length) + Buffer$1.prototype.copy = function copy (target, targetStart, start, end) { + 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('sourceStart out of bounds') + if (end < 0) throw new RangeError('sourceEnd out of bounds') - Buffer$1.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt$1(this, value, offset, 2, 0x7fff, -0x8000); - if (Buffer$1.TYPED_ARRAY_SUPPORT) { - this[offset] = (value >>> 8); - this[offset + 1] = (value & 0xff); - } else { - objectWriteUInt16$1(this, value, offset, false); - } - return offset + 2 - }; + // Are we oob? + if (end > this.length) end = this.length; + if (target.length - targetStart < end - start) { + end = target.length - targetStart + start; + } - Buffer$1.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt$1(this, value, offset, 4, 0x7fffffff, -0x80000000); - if (Buffer$1.TYPED_ARRAY_SUPPORT) { - this[offset] = (value & 0xff); - this[offset + 1] = (value >>> 8); - this[offset + 2] = (value >>> 16); - this[offset + 3] = (value >>> 24); - } else { - objectWriteUInt32$1(this, value, offset, true); - } - return offset + 4 - }; + var len = end - start; + var i; - Buffer$1.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) { - value = +value; - offset = offset | 0; - if (!noAssert) checkInt$1(this, value, offset, 4, 0x7fffffff, -0x80000000); - if (value < 0) value = 0xffffffff + value + 1; - if (Buffer$1.TYPED_ARRAY_SUPPORT) { - this[offset] = (value >>> 24); - this[offset + 1] = (value >>> 16); - this[offset + 2] = (value >>> 8); - this[offset + 3] = (value & 0xff); - } else { - objectWriteUInt32$1(this, value, offset, false); - } - return offset + 4 - }; + if (this === target && start < targetStart && targetStart < end) { + // descending copy from end + for (i = len - 1; i >= 0; --i) { + target[i + targetStart] = this[i + start]; + } + } else if (len < 1000 || !Buffer$1.TYPED_ARRAY_SUPPORT) { + // ascending copy from start + for (i = 0; i < len; ++i) { + target[i + targetStart] = this[i + start]; + } + } else { + Uint8Array.prototype.set.call( + target, + this.subarray(start, start + len), + targetStart + ); + } - function checkIEEE754$1 (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') - } + return len + }; - function writeFloat$1 (buf, value, offset, littleEndian, noAssert) { - if (!noAssert) { - checkIEEE754$1(buf, value, offset, 4); - } - write(buf, value, offset, littleEndian, 23, 4); - return offset + 4 - } + // Usage: + // buffer.fill(number[, offset[, end]]) + // buffer.fill(buffer[, offset[, end]]) + // buffer.fill(string[, offset[, end]][, encoding]) + Buffer$1.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 (val.length === 1) { + var code = val.charCodeAt(0); + if (code < 256) { + val = code; + } + } + if (encoding !== undefined && typeof encoding !== 'string') { + throw new TypeError('encoding must be a string') + } + if (typeof encoding === 'string' && !Buffer$1.isEncoding(encoding)) { + throw new TypeError('Unknown encoding: ' + encoding) + } + } else if (typeof val === 'number') { + val = val & 255; + } - Buffer$1.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) { - return writeFloat$1(this, value, offset, true, noAssert) - }; + // 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') + } - Buffer$1.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) { - return writeFloat$1(this, value, offset, false, noAssert) - }; + if (end <= start) { + return this + } - function writeDouble$1 (buf, value, offset, littleEndian, noAssert) { - if (!noAssert) { - checkIEEE754$1(buf, value, offset, 8); - } - write(buf, value, offset, littleEndian, 52, 8); - return offset + 8 - } + start = start >>> 0; + end = end === undefined ? this.length : end >>> 0; - Buffer$1.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) { - return writeDouble$1(this, value, offset, true, noAssert) - }; + if (!val) val = 0; - Buffer$1.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) { - return writeDouble$1(this, value, offset, false, noAssert) - }; + var i; + if (typeof val === 'number') { + for (i = start; i < end; ++i) { + this[i] = val; + } + } else { + var bytes = internalIsBuffer$1(val) + ? val + : utf8ToBytes$1(new Buffer$1(val, encoding).toString()); + var len = bytes.length; + for (i = 0; i < end - start; ++i) { + this[i + start] = bytes[i % len]; + } + } - // copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length) - Buffer$1.prototype.copy = function copy (target, targetStart, start, end) { - 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('sourceStart out of bounds') - if (end < 0) throw new RangeError('sourceEnd out of bounds') + return this + }; - // Are we oob? - if (end > this.length) end = this.length; - if (target.length - targetStart < end - start) { - end = target.length - targetStart + start; - } + // HELPER FUNCTIONS + // ================ - var len = end - start; - var i; - - if (this === target && start < targetStart && targetStart < end) { - // descending copy from end - for (i = len - 1; i >= 0; --i) { - target[i + targetStart] = this[i + start]; - } - } else if (len < 1000 || !Buffer$1.TYPED_ARRAY_SUPPORT) { - // ascending copy from start - for (i = 0; i < len; ++i) { - target[i + targetStart] = this[i + start]; - } - } else { - Uint8Array.prototype.set.call( - target, - this.subarray(start, start + len), - targetStart - ); - } + var INVALID_BASE64_RE$1 = /[^+\/0-9A-Za-z-_]/g; - return len - }; + function base64clean$1 (str) { + // Node strips out invalid characters like \n and \t from the string, base64-js does not + str = stringtrim$1(str).replace(INVALID_BASE64_RE$1, ''); + // 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 stringtrim$1 (str) { + if (str.trim) return str.trim() + return str.replace(/^\s+|\s+$/g, '') + } + + function toHex$1 (n) { + if (n < 16) return '0' + n.toString(16) + return n.toString(16) + } + + function utf8ToBytes$1 (string, units) { + units = units || Infinity; + var codePoint; + var length = string.length; + var leadSurrogate = null; + var bytes = []; + + for (var 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 + } - // Usage: - // buffer.fill(number[, offset[, end]]) - // buffer.fill(buffer[, offset[, end]]) - // buffer.fill(string[, offset[, end]][, encoding]) - Buffer$1.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 (val.length === 1) { - var code = val.charCodeAt(0); - if (code < 256) { - val = code; - } - } - if (encoding !== undefined && typeof encoding !== 'string') { - throw new TypeError('encoding must be a string') - } - if (typeof encoding === 'string' && !Buffer$1.isEncoding(encoding)) { - throw new TypeError('Unknown encoding: ' + encoding) - } - } else if (typeof val === 'number') { - val = val & 255; - } + // valid lead + leadSurrogate = codePoint; - // 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') - } + continue + } - if (end <= start) { - return this - } + // 2 leads in a row + if (codePoint < 0xDC00) { + if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD); + leadSurrogate = codePoint; + continue + } - start = start >>> 0; - end = end === undefined ? this.length : end >>> 0; + // 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); + } - if (!val) val = 0; + 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') + } + } - var i; - if (typeof val === 'number') { - for (i = start; i < end; ++i) { - this[i] = val; - } - } else { - var bytes = internalIsBuffer$1(val) - ? val - : utf8ToBytes$1(new Buffer$1(val, encoding).toString()); - var len = bytes.length; - for (i = 0; i < end - start; ++i) { - this[i + start] = bytes[i % len]; + return bytes } - } - - return this - }; - - // HELPER FUNCTIONS - // ================ - var INVALID_BASE64_RE$1 = /[^+\/0-9A-Za-z-_]/g; - - function base64clean$1 (str) { - // Node strips out invalid characters like \n and \t from the string, base64-js does not - str = stringtrim$1(str).replace(INVALID_BASE64_RE$1, ''); - // 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 asciiToBytes$1 (str) { + var byteArray = []; + for (var 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 stringtrim$1 (str) { - if (str.trim) return str.trim() - return str.replace(/^\s+|\s+$/g, '') - } + function utf16leToBytes$1 (str, units) { + var c, hi, lo; + var byteArray = []; + for (var i = 0; i < str.length; ++i) { + if ((units -= 2) < 0) break - function toHex$1 (n) { - if (n < 16) return '0' + n.toString(16) - return n.toString(16) - } + c = str.charCodeAt(i); + hi = c >> 8; + lo = c % 256; + byteArray.push(lo); + byteArray.push(hi); + } - function utf8ToBytes$1 (string, units) { - units = units || Infinity; - var codePoint; - var length = string.length; - var leadSurrogate = null; - var bytes = []; - - for (var 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 - } + return byteArray + } - // valid lead - leadSurrogate = codePoint; - continue - } + function base64ToBytes$1 (str) { + return toByteArray(base64clean$1(str)) + } - // 2 leads in a row - if (codePoint < 0xDC00) { - if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD); - leadSurrogate = codePoint; - continue + function blitBuffer$1 (src, dst, offset, length) { + for (var i = 0; i < length; ++i) { + if ((i + offset >= dst.length) || (i >= src.length)) break + dst[i + offset] = src[i]; } + return i + } - // 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); + function isnan$1 (val) { + return val !== val // eslint-disable-line no-self-compare } - 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') + // the following is from is-buffer, also by Feross Aboukhadijeh and with same lisence + // The _isBuffer check is for Safari 5-7 support, because it's missing + // Object.prototype.constructor. Remove this eventually + function isBuffer$1(obj) { + return obj != null && (!!obj._isBuffer || isFastBuffer$1(obj) || isSlowBuffer$1(obj)) } - } - return bytes - } + function isFastBuffer$1 (obj) { + return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj) + } - function asciiToBytes$1 (str) { - var byteArray = []; - for (var 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 - } + // For Node v0.10 support. Remove this eventually. + function isSlowBuffer$1 (obj) { + return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isFastBuffer$1(obj.slice(0, 0)) + } - function utf16leToBytes$1 (str, units) { - var c, hi, lo; - var byteArray = []; - for (var 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); - } + function BufferList() { + this.head = null; + this.tail = null; + this.length = 0; + } - return byteArray - } + BufferList.prototype.push = function (v) { + var entry = { data: v, next: null }; + if (this.length > 0) this.tail.next = entry;else this.head = entry; + this.tail = entry; + ++this.length; + }; + BufferList.prototype.unshift = function (v) { + var entry = { data: v, next: this.head }; + if (this.length === 0) this.tail = entry; + this.head = entry; + ++this.length; + }; - function base64ToBytes$1 (str) { - return toByteArray(base64clean$1(str)) - } + BufferList.prototype.shift = function () { + if (this.length === 0) return; + var ret = this.head.data; + if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next; + --this.length; + return ret; + }; - function blitBuffer$1 (src, dst, offset, length) { - for (var i = 0; i < length; ++i) { - if ((i + offset >= dst.length) || (i >= src.length)) break - dst[i + offset] = src[i]; - } - return i - } + BufferList.prototype.clear = function () { + this.head = this.tail = null; + this.length = 0; + }; - function isnan$1 (val) { - return val !== val // eslint-disable-line no-self-compare - } + BufferList.prototype.join = function (s) { + if (this.length === 0) return ''; + var p = this.head; + var ret = '' + p.data; + while (p = p.next) { + ret += s + p.data; + }return ret; + }; + BufferList.prototype.concat = function (n) { + if (this.length === 0) return Buffer$1.alloc(0); + if (this.length === 1) return this.head.data; + var ret = Buffer$1.allocUnsafe(n >>> 0); + var p = this.head; + var i = 0; + while (p) { + p.data.copy(ret, i); + i += p.data.length; + p = p.next; + } + return ret; + }; - // the following is from is-buffer, also by Feross Aboukhadijeh and with same lisence - // The _isBuffer check is for Safari 5-7 support, because it's missing - // Object.prototype.constructor. Remove this eventually - function isBuffer$1(obj) { - return obj != null && (!!obj._isBuffer || isFastBuffer$1(obj) || isSlowBuffer$1(obj)) - } + // Copyright Joyent, Inc. and other Node contributors. + var isBufferEncoding = Buffer$1.isEncoding + || function(encoding) { + switch (encoding && encoding.toLowerCase()) { + case 'hex': case 'utf8': case 'utf-8': case 'ascii': case 'binary': case 'base64': case 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': case 'raw': return true; + default: return false; + } + }; - function isFastBuffer$1 (obj) { - return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj) - } - // For Node v0.10 support. Remove this eventually. - function isSlowBuffer$1 (obj) { - return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isFastBuffer$1(obj.slice(0, 0)) - } + function assertEncoding(encoding) { + if (encoding && !isBufferEncoding(encoding)) { + throw new Error('Unknown encoding: ' + encoding); + } + } - function BufferList() { - this.head = null; - this.tail = null; - this.length = 0; - } + // StringDecoder provides an interface for efficiently splitting a series of + // buffers into a series of JS strings without breaking apart multi-byte + // characters. CESU-8 is handled as part of the UTF-8 encoding. + // + // @TODO Handling all encodings inside a single object makes it very difficult + // to reason about this code, so it should be split up in the future. + // @TODO There should be a utf8-strict encoding that rejects invalid UTF-8 code + // points as used by CESU-8. + function StringDecoder(encoding) { + this.encoding = (encoding || 'utf8').toLowerCase().replace(/[-_]/, ''); + assertEncoding(encoding); + switch (this.encoding) { + case 'utf8': + // CESU-8 represents each of Surrogate Pair by 3-bytes + this.surrogateSize = 3; + break; + case 'ucs2': + case 'utf16le': + // UTF-16 represents each of Surrogate Pair by 2-bytes + this.surrogateSize = 2; + this.detectIncompleteChar = utf16DetectIncompleteChar; + break; + case 'base64': + // Base-64 stores 3 bytes in 4 chars, and pads the remainder. + this.surrogateSize = 3; + this.detectIncompleteChar = base64DetectIncompleteChar; + break; + default: + this.write = passThroughWrite; + return; + } - BufferList.prototype.push = function (v) { - var entry = { data: v, next: null }; - if (this.length > 0) this.tail.next = entry;else this.head = entry; - this.tail = entry; - ++this.length; - }; + // Enough space to store all bytes of a single character. UTF-8 needs 4 + // bytes, but CESU-8 may require up to 6 (3 bytes per surrogate). + this.charBuffer = new Buffer$1(6); + // Number of bytes received for the current incomplete multi-byte character. + this.charReceived = 0; + // Number of bytes expected for the current incomplete multi-byte character. + this.charLength = 0; + } - BufferList.prototype.unshift = function (v) { - var entry = { data: v, next: this.head }; - if (this.length === 0) this.tail = entry; - this.head = entry; - ++this.length; - }; + // write decodes the given buffer and returns it as JS string that is + // guaranteed to not contain any partial multi-byte characters. Any partial + // character found at the end of the buffer is buffered up, and will be + // returned when calling write again with the remaining bytes. + // + // Note: Converting a Buffer containing an orphan surrogate to a String + // currently works, but converting a String to a Buffer (via `new Buffer`, or + // Buffer#write) will replace incomplete surrogates with the unicode + // replacement character. See https://codereview.chromium.org/121173009/ . + StringDecoder.prototype.write = function(buffer) { + var charStr = ''; + // if our last write ended with an incomplete multibyte character + while (this.charLength) { + // determine how many remaining bytes this buffer has to offer for this char + var available = (buffer.length >= this.charLength - this.charReceived) ? + this.charLength - this.charReceived : + buffer.length; + + // add the new bytes to the char buffer + buffer.copy(this.charBuffer, this.charReceived, 0, available); + this.charReceived += available; + + if (this.charReceived < this.charLength) { + // still not enough chars in this buffer? wait for more ... + return ''; + } - BufferList.prototype.shift = function () { - if (this.length === 0) return; - var ret = this.head.data; - if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next; - --this.length; - return ret; - }; + // remove bytes belonging to the current character from the buffer + buffer = buffer.slice(available, buffer.length); - BufferList.prototype.clear = function () { - this.head = this.tail = null; - this.length = 0; - }; + // get the character that was split + charStr = this.charBuffer.slice(0, this.charLength).toString(this.encoding); - BufferList.prototype.join = function (s) { - if (this.length === 0) return ''; - var p = this.head; - var ret = '' + p.data; - while (p = p.next) { - ret += s + p.data; - }return ret; - }; + // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character + var charCode = charStr.charCodeAt(charStr.length - 1); + if (charCode >= 0xD800 && charCode <= 0xDBFF) { + this.charLength += this.surrogateSize; + charStr = ''; + continue; + } + this.charReceived = this.charLength = 0; - BufferList.prototype.concat = function (n) { - if (this.length === 0) return Buffer$1.alloc(0); - if (this.length === 1) return this.head.data; - var ret = Buffer$1.allocUnsafe(n >>> 0); - var p = this.head; - var i = 0; - while (p) { - p.data.copy(ret, i); - i += p.data.length; - p = p.next; - } - return ret; - }; + // if there are no more bytes in this buffer, just emit our char + if (buffer.length === 0) { + return charStr; + } + break; + } - // Copyright Joyent, Inc. and other Node contributors. - var isBufferEncoding = Buffer$1.isEncoding - || function(encoding) { - switch (encoding && encoding.toLowerCase()) { - case 'hex': case 'utf8': case 'utf-8': case 'ascii': case 'binary': case 'base64': case 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': case 'raw': return true; - default: return false; - } - }; + // determine and set charLength / charReceived + this.detectIncompleteChar(buffer); + var end = buffer.length; + if (this.charLength) { + // buffer the incomplete character bytes we got + buffer.copy(this.charBuffer, 0, buffer.length - this.charReceived, end); + end -= this.charReceived; + } - function assertEncoding(encoding) { - if (encoding && !isBufferEncoding(encoding)) { - throw new Error('Unknown encoding: ' + encoding); - } - } + charStr += buffer.toString(this.encoding, 0, end); + + var end = charStr.length - 1; + var charCode = charStr.charCodeAt(end); + // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character + if (charCode >= 0xD800 && charCode <= 0xDBFF) { + var size = this.surrogateSize; + this.charLength += size; + this.charReceived += size; + this.charBuffer.copy(this.charBuffer, size, 0, size); + buffer.copy(this.charBuffer, 0, 0, size); + return charStr.substring(0, end); + } - // StringDecoder provides an interface for efficiently splitting a series of - // buffers into a series of JS strings without breaking apart multi-byte - // characters. CESU-8 is handled as part of the UTF-8 encoding. - // - // @TODO Handling all encodings inside a single object makes it very difficult - // to reason about this code, so it should be split up in the future. - // @TODO There should be a utf8-strict encoding that rejects invalid UTF-8 code - // points as used by CESU-8. - function StringDecoder(encoding) { - this.encoding = (encoding || 'utf8').toLowerCase().replace(/[-_]/, ''); - assertEncoding(encoding); - switch (this.encoding) { - case 'utf8': - // CESU-8 represents each of Surrogate Pair by 3-bytes - this.surrogateSize = 3; - break; - case 'ucs2': - case 'utf16le': - // UTF-16 represents each of Surrogate Pair by 2-bytes - this.surrogateSize = 2; - this.detectIncompleteChar = utf16DetectIncompleteChar; - break; - case 'base64': - // Base-64 stores 3 bytes in 4 chars, and pads the remainder. - this.surrogateSize = 3; - this.detectIncompleteChar = base64DetectIncompleteChar; - break; - default: - this.write = passThroughWrite; - return; - } + // or just emit the charStr + return charStr; + }; - // Enough space to store all bytes of a single character. UTF-8 needs 4 - // bytes, but CESU-8 may require up to 6 (3 bytes per surrogate). - this.charBuffer = new Buffer$1(6); - // Number of bytes received for the current incomplete multi-byte character. - this.charReceived = 0; - // Number of bytes expected for the current incomplete multi-byte character. - this.charLength = 0; - } + // detectIncompleteChar determines if there is an incomplete UTF-8 character at + // the end of the given buffer. If so, it sets this.charLength to the byte + // length that character, and sets this.charReceived to the number of bytes + // that are available for this character. + StringDecoder.prototype.detectIncompleteChar = function(buffer) { + // determine how many bytes we have to check at the end of this buffer + var i = (buffer.length >= 3) ? 3 : buffer.length; - // write decodes the given buffer and returns it as JS string that is - // guaranteed to not contain any partial multi-byte characters. Any partial - // character found at the end of the buffer is buffered up, and will be - // returned when calling write again with the remaining bytes. - // - // Note: Converting a Buffer containing an orphan surrogate to a String - // currently works, but converting a String to a Buffer (via `new Buffer`, or - // Buffer#write) will replace incomplete surrogates with the unicode - // replacement character. See https://codereview.chromium.org/121173009/ . - StringDecoder.prototype.write = function(buffer) { - var charStr = ''; - // if our last write ended with an incomplete multibyte character - while (this.charLength) { - // determine how many remaining bytes this buffer has to offer for this char - var available = (buffer.length >= this.charLength - this.charReceived) ? - this.charLength - this.charReceived : - buffer.length; - - // add the new bytes to the char buffer - buffer.copy(this.charBuffer, this.charReceived, 0, available); - this.charReceived += available; - - if (this.charReceived < this.charLength) { - // still not enough chars in this buffer? wait for more ... - return ''; - } - - // remove bytes belonging to the current character from the buffer - buffer = buffer.slice(available, buffer.length); - - // get the character that was split - charStr = this.charBuffer.slice(0, this.charLength).toString(this.encoding); - - // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character - var charCode = charStr.charCodeAt(charStr.length - 1); - if (charCode >= 0xD800 && charCode <= 0xDBFF) { - this.charLength += this.surrogateSize; - charStr = ''; - continue; - } - this.charReceived = this.charLength = 0; - - // if there are no more bytes in this buffer, just emit our char - if (buffer.length === 0) { - return charStr; - } - break; - } + // Figure out if one of the last i bytes of our buffer announces an + // incomplete char. + for (; i > 0; i--) { + var c = buffer[buffer.length - i]; - // determine and set charLength / charReceived - this.detectIncompleteChar(buffer); + // See http://en.wikipedia.org/wiki/UTF-8#Description - var end = buffer.length; - if (this.charLength) { - // buffer the incomplete character bytes we got - buffer.copy(this.charBuffer, 0, buffer.length - this.charReceived, end); - end -= this.charReceived; - } + // 110XXXXX + if (i == 1 && c >> 5 == 0x06) { + this.charLength = 2; + break; + } - charStr += buffer.toString(this.encoding, 0, end); - - var end = charStr.length - 1; - var charCode = charStr.charCodeAt(end); - // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character - if (charCode >= 0xD800 && charCode <= 0xDBFF) { - var size = this.surrogateSize; - this.charLength += size; - this.charReceived += size; - this.charBuffer.copy(this.charBuffer, size, 0, size); - buffer.copy(this.charBuffer, 0, 0, size); - return charStr.substring(0, end); - } + // 1110XXXX + if (i <= 2 && c >> 4 == 0x0E) { + this.charLength = 3; + break; + } - // or just emit the charStr - return charStr; - }; + // 11110XXX + if (i <= 3 && c >> 3 == 0x1E) { + this.charLength = 4; + break; + } + } + this.charReceived = i; + }; - // detectIncompleteChar determines if there is an incomplete UTF-8 character at - // the end of the given buffer. If so, it sets this.charLength to the byte - // length that character, and sets this.charReceived to the number of bytes - // that are available for this character. - StringDecoder.prototype.detectIncompleteChar = function(buffer) { - // determine how many bytes we have to check at the end of this buffer - var i = (buffer.length >= 3) ? 3 : buffer.length; + StringDecoder.prototype.end = function(buffer) { + var res = ''; + if (buffer && buffer.length) + res = this.write(buffer); - // Figure out if one of the last i bytes of our buffer announces an - // incomplete char. - for (; i > 0; i--) { - var c = buffer[buffer.length - i]; + if (this.charReceived) { + var cr = this.charReceived; + var buf = this.charBuffer; + var enc = this.encoding; + res += buf.slice(0, cr).toString(enc); + } - // See http://en.wikipedia.org/wiki/UTF-8#Description + return res; + }; - // 110XXXXX - if (i == 1 && c >> 5 == 0x06) { - this.charLength = 2; - break; + function passThroughWrite(buffer) { + return buffer.toString(this.encoding); } - // 1110XXXX - if (i <= 2 && c >> 4 == 0x0E) { - this.charLength = 3; - break; + function utf16DetectIncompleteChar(buffer) { + this.charReceived = buffer.length % 2; + this.charLength = this.charReceived ? 2 : 0; } - // 11110XXX - if (i <= 3 && c >> 3 == 0x1E) { - this.charLength = 4; - break; + function base64DetectIncompleteChar(buffer) { + this.charReceived = buffer.length % 3; + this.charLength = this.charReceived ? 3 : 0; } - } - this.charReceived = i; - }; - StringDecoder.prototype.end = function(buffer) { - var res = ''; - if (buffer && buffer.length) - res = this.write(buffer); + Readable.ReadableState = ReadableState; - if (this.charReceived) { - var cr = this.charReceived; - var buf = this.charBuffer; - var enc = this.encoding; - res += buf.slice(0, cr).toString(enc); - } + var debug = debuglog('stream'); + inherits$1(Readable, EventEmitter); - return res; - }; + function prependListener(emitter, event, fn) { + // Sadly this is not cacheable as some libraries bundle their own + // event emitter implementation with them. + if (typeof emitter.prependListener === 'function') { + return emitter.prependListener(event, fn); + } else { + // This is a hack to make sure that our error handler is attached before any + // userland ones. NEVER DO THIS. This is here only because this code needs + // to continue to work with older versions of Node.js that do not include + // the prependListener() method. The goal is to eventually remove this hack. + if (!emitter._events || !emitter._events[event]) + emitter.on(event, fn); + else if (Array.isArray(emitter._events[event])) + emitter._events[event].unshift(fn); + else + emitter._events[event] = [fn, emitter._events[event]]; + } + } + function listenerCount$1 (emitter, type) { + return emitter.listeners(type).length; + } + function ReadableState(options, stream) { + + options = options || {}; + + // object stream flag. Used to make read(n) ignore n and to + // make all the buffer merging and length checks go away + this.objectMode = !!options.objectMode; + + if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.readableObjectMode; + + // the point at which it stops calling _read() to fill the buffer + // Note: 0 is a valid value, means "don't call _read preemptively ever" + var hwm = options.highWaterMark; + var defaultHwm = this.objectMode ? 16 : 16 * 1024; + this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm; + + // cast to ints. + this.highWaterMark = ~ ~this.highWaterMark; + + // A linked list is used to store data chunks instead of an array because the + // linked list can remove elements from the beginning faster than + // array.shift() + this.buffer = new BufferList(); + this.length = 0; + this.pipes = null; + this.pipesCount = 0; + this.flowing = null; + this.ended = false; + this.endEmitted = false; + this.reading = false; + + // a flag to be able to tell if the onwrite cb is called immediately, + // or on a later tick. We set this to true at first, because any + // actions that shouldn't happen until "later" should generally also + // not happen before the first write call. + this.sync = true; + + // whenever we return null, then we set a flag to say + // that we're awaiting a 'readable' event emission. + this.needReadable = false; + this.emittedReadable = false; + this.readableListening = false; + this.resumeScheduled = false; + + // Crypto is kind of old and crusty. Historically, its default string + // encoding is 'binary' so we have to make this configurable. + // Everything else in the universe uses 'utf8', though. + this.defaultEncoding = options.defaultEncoding || 'utf8'; + + // when piping, we only care about 'readable' events that happen + // after read()ing all the bytes and not getting any pushback. + this.ranOut = false; + + // the number of writers that are awaiting a drain event in .pipe()s + this.awaitDrain = 0; + + // if true, a maybeReadMore has been scheduled + this.readingMore = false; + + this.decoder = null; + this.encoding = null; + if (options.encoding) { + this.decoder = new StringDecoder(options.encoding); + this.encoding = options.encoding; + } + } + function Readable(options) { - function passThroughWrite(buffer) { - return buffer.toString(this.encoding); - } + if (!(this instanceof Readable)) return new Readable(options); - function utf16DetectIncompleteChar(buffer) { - this.charReceived = buffer.length % 2; - this.charLength = this.charReceived ? 2 : 0; - } + this._readableState = new ReadableState(options, this); - function base64DetectIncompleteChar(buffer) { - this.charReceived = buffer.length % 3; - this.charLength = this.charReceived ? 3 : 0; - } + // legacy + this.readable = true; - Readable.ReadableState = ReadableState; - - var debug = debuglog('stream'); - inherits$1(Readable, EventEmitter); - - function prependListener(emitter, event, fn) { - // Sadly this is not cacheable as some libraries bundle their own - // event emitter implementation with them. - if (typeof emitter.prependListener === 'function') { - return emitter.prependListener(event, fn); - } else { - // This is a hack to make sure that our error handler is attached before any - // userland ones. NEVER DO THIS. This is here only because this code needs - // to continue to work with older versions of Node.js that do not include - // the prependListener() method. The goal is to eventually remove this hack. - if (!emitter._events || !emitter._events[event]) - emitter.on(event, fn); - else if (Array.isArray(emitter._events[event])) - emitter._events[event].unshift(fn); - else - emitter._events[event] = [fn, emitter._events[event]]; - } - } - function listenerCount$1 (emitter, type) { - return emitter.listeners(type).length; - } - function ReadableState(options, stream) { - - options = options || {}; - - // object stream flag. Used to make read(n) ignore n and to - // make all the buffer merging and length checks go away - this.objectMode = !!options.objectMode; - - if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.readableObjectMode; - - // the point at which it stops calling _read() to fill the buffer - // Note: 0 is a valid value, means "don't call _read preemptively ever" - var hwm = options.highWaterMark; - var defaultHwm = this.objectMode ? 16 : 16 * 1024; - this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm; - - // cast to ints. - this.highWaterMark = ~ ~this.highWaterMark; - - // A linked list is used to store data chunks instead of an array because the - // linked list can remove elements from the beginning faster than - // array.shift() - this.buffer = new BufferList(); - this.length = 0; - this.pipes = null; - this.pipesCount = 0; - this.flowing = null; - this.ended = false; - this.endEmitted = false; - this.reading = false; - - // a flag to be able to tell if the onwrite cb is called immediately, - // or on a later tick. We set this to true at first, because any - // actions that shouldn't happen until "later" should generally also - // not happen before the first write call. - this.sync = true; - - // whenever we return null, then we set a flag to say - // that we're awaiting a 'readable' event emission. - this.needReadable = false; - this.emittedReadable = false; - this.readableListening = false; - this.resumeScheduled = false; - - // Crypto is kind of old and crusty. Historically, its default string - // encoding is 'binary' so we have to make this configurable. - // Everything else in the universe uses 'utf8', though. - this.defaultEncoding = options.defaultEncoding || 'utf8'; - - // when piping, we only care about 'readable' events that happen - // after read()ing all the bytes and not getting any pushback. - this.ranOut = false; - - // the number of writers that are awaiting a drain event in .pipe()s - this.awaitDrain = 0; - - // if true, a maybeReadMore has been scheduled - this.readingMore = false; - - this.decoder = null; - this.encoding = null; - if (options.encoding) { - this.decoder = new StringDecoder(options.encoding); - this.encoding = options.encoding; - } - } - function Readable(options) { + if (options && typeof options.read === 'function') this._read = options.read; - if (!(this instanceof Readable)) return new Readable(options); + EventEmitter.call(this); + } - this._readableState = new ReadableState(options, this); + // Manually shove something into the read() buffer. + // This returns true if the highWaterMark has not been hit yet, + // similar to how Writable.write() returns true if you should + // write() some more. + Readable.prototype.push = function (chunk, encoding) { + var state = this._readableState; - // legacy - this.readable = true; + if (!state.objectMode && typeof chunk === 'string') { + encoding = encoding || state.defaultEncoding; + if (encoding !== state.encoding) { + chunk = Buffer.from(chunk, encoding); + encoding = ''; + } + } - if (options && typeof options.read === 'function') this._read = options.read; + return readableAddChunk(this, state, chunk, encoding, false); + }; - EventEmitter.call(this); - } + // Unshift should *always* be something directly out of read() + Readable.prototype.unshift = function (chunk) { + var state = this._readableState; + return readableAddChunk(this, state, chunk, '', true); + }; - // Manually shove something into the read() buffer. - // This returns true if the highWaterMark has not been hit yet, - // similar to how Writable.write() returns true if you should - // write() some more. - Readable.prototype.push = function (chunk, encoding) { - var state = this._readableState; + Readable.prototype.isPaused = function () { + return this._readableState.flowing === false; + }; - if (!state.objectMode && typeof chunk === 'string') { - encoding = encoding || state.defaultEncoding; - if (encoding !== state.encoding) { - chunk = Buffer.from(chunk, encoding); - encoding = ''; - } - } + function readableAddChunk(stream, state, chunk, encoding, addToFront) { + var er = chunkInvalid(state, chunk); + if (er) { + stream.emit('error', er); + } else if (chunk === null) { + state.reading = false; + onEofChunk(stream, state); + } else if (state.objectMode || chunk && chunk.length > 0) { + if (state.ended && !addToFront) { + var e = new Error('stream.push() after EOF'); + stream.emit('error', e); + } else if (state.endEmitted && addToFront) { + var _e = new Error('stream.unshift() after end event'); + stream.emit('error', _e); + } else { + var skipAdd; + if (state.decoder && !addToFront && !encoding) { + chunk = state.decoder.write(chunk); + skipAdd = !state.objectMode && chunk.length === 0; + } - return readableAddChunk(this, state, chunk, encoding, false); - }; + if (!addToFront) state.reading = false; - // Unshift should *always* be something directly out of read() - Readable.prototype.unshift = function (chunk) { - var state = this._readableState; - return readableAddChunk(this, state, chunk, '', true); - }; + // Don't add to the buffer if we've decoded to an empty string chunk and + // we're not in object mode + if (!skipAdd) { + // if we want the data now, just emit it. + if (state.flowing && state.length === 0 && !state.sync) { + stream.emit('data', chunk); + stream.read(0); + } else { + // update the buffer info. + state.length += state.objectMode ? 1 : chunk.length; + if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk); - Readable.prototype.isPaused = function () { - return this._readableState.flowing === false; - }; + if (state.needReadable) emitReadable(stream); + } + } - function readableAddChunk(stream, state, chunk, encoding, addToFront) { - var er = chunkInvalid(state, chunk); - if (er) { - stream.emit('error', er); - } else if (chunk === null) { - state.reading = false; - onEofChunk(stream, state); - } else if (state.objectMode || chunk && chunk.length > 0) { - if (state.ended && !addToFront) { - var e = new Error('stream.push() after EOF'); - stream.emit('error', e); - } else if (state.endEmitted && addToFront) { - var _e = new Error('stream.unshift() after end event'); - stream.emit('error', _e); - } else { - var skipAdd; - if (state.decoder && !addToFront && !encoding) { - chunk = state.decoder.write(chunk); - skipAdd = !state.objectMode && chunk.length === 0; + maybeReadMore(stream, state); + } + } else if (!addToFront) { + state.reading = false; } - if (!addToFront) state.reading = false; + return needMoreData(state); + } - // Don't add to the buffer if we've decoded to an empty string chunk and - // we're not in object mode - if (!skipAdd) { - // if we want the data now, just emit it. - if (state.flowing && state.length === 0 && !state.sync) { - stream.emit('data', chunk); - stream.read(0); - } else { - // update the buffer info. - state.length += state.objectMode ? 1 : chunk.length; - if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk); + // if it's past the high water mark, we can push in some more. + // Also, if we have no data yet, we can stand some + // more bytes. This is to work around cases where hwm=0, + // such as the repl. Also, if the push() triggered a + // readable event, and the user called read(largeNumber) such that + // needReadable was set, then we ought to push more, so that another + // 'readable' event will be triggered. + function needMoreData(state) { + return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0); + } - if (state.needReadable) emitReadable(stream); - } + // backwards compatibility. + Readable.prototype.setEncoding = function (enc) { + this._readableState.decoder = new StringDecoder(enc); + this._readableState.encoding = enc; + return this; + }; + + // Don't raise the hwm > 8MB + var MAX_HWM = 0x800000; + function computeNewHighWaterMark(n) { + if (n >= MAX_HWM) { + n = MAX_HWM; + } else { + // Get the next highest power of 2 to prevent increasing hwm excessively in + // tiny amounts + n--; + n |= n >>> 1; + n |= n >>> 2; + n |= n >>> 4; + n |= n >>> 8; + n |= n >>> 16; + n++; } + return n; + } - maybeReadMore(stream, state); + // This function is designed to be inlinable, so please take care when making + // changes to the function body. + function howMuchToRead(n, state) { + if (n <= 0 || state.length === 0 && state.ended) return 0; + if (state.objectMode) return 1; + if (n !== n) { + // Only flow one buffer at a time + if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length; + } + // If we're asking for more than the current hwm, then raise the hwm. + if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n); + if (n <= state.length) return n; + // Don't have enough + if (!state.ended) { + state.needReadable = true; + return 0; + } + return state.length; } - } else if (!addToFront) { - state.reading = false; - } - return needMoreData(state); - } + // you can override either this method, or the async _read(n) below. + Readable.prototype.read = function (n) { + debug('read', n); + n = parseInt(n, 10); + var state = this._readableState; + var nOrig = n; - // if it's past the high water mark, we can push in some more. - // Also, if we have no data yet, we can stand some - // more bytes. This is to work around cases where hwm=0, - // such as the repl. Also, if the push() triggered a - // readable event, and the user called read(largeNumber) such that - // needReadable was set, then we ought to push more, so that another - // 'readable' event will be triggered. - function needMoreData(state) { - return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0); - } + if (n !== 0) state.emittedReadable = false; - // backwards compatibility. - Readable.prototype.setEncoding = function (enc) { - this._readableState.decoder = new StringDecoder(enc); - this._readableState.encoding = enc; - return this; - }; + // if we're doing read(0) to trigger a readable event, but we + // already have a bunch of data in the buffer, then just trigger + // the 'readable' event and move on. + if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) { + debug('read: emitReadable', state.length, state.ended); + if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this); + return null; + } - // Don't raise the hwm > 8MB - var MAX_HWM = 0x800000; - function computeNewHighWaterMark(n) { - if (n >= MAX_HWM) { - n = MAX_HWM; - } else { - // Get the next highest power of 2 to prevent increasing hwm excessively in - // tiny amounts - n--; - n |= n >>> 1; - n |= n >>> 2; - n |= n >>> 4; - n |= n >>> 8; - n |= n >>> 16; - n++; - } - return n; - } + n = howMuchToRead(n, state); - // This function is designed to be inlinable, so please take care when making - // changes to the function body. - function howMuchToRead(n, state) { - if (n <= 0 || state.length === 0 && state.ended) return 0; - if (state.objectMode) return 1; - if (n !== n) { - // Only flow one buffer at a time - if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length; - } - // If we're asking for more than the current hwm, then raise the hwm. - if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n); - if (n <= state.length) return n; - // Don't have enough - if (!state.ended) { - state.needReadable = true; - return 0; - } - return state.length; - } + // if we've ended, and we're now clear, then finish it up. + if (n === 0 && state.ended) { + if (state.length === 0) endReadable(this); + return null; + } - // you can override either this method, or the async _read(n) below. - Readable.prototype.read = function (n) { - debug('read', n); - n = parseInt(n, 10); - var state = this._readableState; - var nOrig = n; - - if (n !== 0) state.emittedReadable = false; - - // if we're doing read(0) to trigger a readable event, but we - // already have a bunch of data in the buffer, then just trigger - // the 'readable' event and move on. - if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) { - debug('read: emitReadable', state.length, state.ended); - if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this); - return null; - } + // All the actual chunk generation logic needs to be + // *below* the call to _read. The reason is that in certain + // synthetic stream cases, such as passthrough streams, _read + // may be a completely synchronous operation which may change + // the state of the read buffer, providing enough data when + // before there was *not* enough. + // + // So, the steps are: + // 1. Figure out what the state of things will be after we do + // a read from the buffer. + // + // 2. If that resulting state will trigger a _read, then call _read. + // Note that this may be asynchronous, or synchronous. Yes, it is + // deeply ugly to write APIs this way, but that still doesn't mean + // that the Readable class should behave improperly, as streams are + // designed to be sync/async agnostic. + // Take note if the _read call is sync or async (ie, if the read call + // has returned yet), so that we know whether or not it's safe to emit + // 'readable' etc. + // + // 3. Actually pull the requested chunks out of the buffer and return. + + // if we need a readable event, then we need to do some reading. + var doRead = state.needReadable; + debug('need readable', doRead); + + // if we currently have less than the highWaterMark, then also read some + if (state.length === 0 || state.length - n < state.highWaterMark) { + doRead = true; + debug('length less than watermark', doRead); + } - n = howMuchToRead(n, state); + // however, if we've ended, then there's no point, and if we're already + // reading, then it's unnecessary. + if (state.ended || state.reading) { + doRead = false; + debug('reading or ended', doRead); + } else if (doRead) { + debug('do read'); + state.reading = true; + state.sync = true; + // if the length is currently zero, then we *need* a readable event. + if (state.length === 0) state.needReadable = true; + // call internal read method + this._read(state.highWaterMark); + state.sync = false; + // If _read pushed data synchronously, then `reading` will be false, + // and we need to re-evaluate how much data we can return to the user. + if (!state.reading) n = howMuchToRead(nOrig, state); + } - // if we've ended, and we're now clear, then finish it up. - if (n === 0 && state.ended) { - if (state.length === 0) endReadable(this); - return null; - } + var ret; + if (n > 0) ret = fromList(n, state);else ret = null; - // All the actual chunk generation logic needs to be - // *below* the call to _read. The reason is that in certain - // synthetic stream cases, such as passthrough streams, _read - // may be a completely synchronous operation which may change - // the state of the read buffer, providing enough data when - // before there was *not* enough. - // - // So, the steps are: - // 1. Figure out what the state of things will be after we do - // a read from the buffer. - // - // 2. If that resulting state will trigger a _read, then call _read. - // Note that this may be asynchronous, or synchronous. Yes, it is - // deeply ugly to write APIs this way, but that still doesn't mean - // that the Readable class should behave improperly, as streams are - // designed to be sync/async agnostic. - // Take note if the _read call is sync or async (ie, if the read call - // has returned yet), so that we know whether or not it's safe to emit - // 'readable' etc. - // - // 3. Actually pull the requested chunks out of the buffer and return. - - // if we need a readable event, then we need to do some reading. - var doRead = state.needReadable; - debug('need readable', doRead); - - // if we currently have less than the highWaterMark, then also read some - if (state.length === 0 || state.length - n < state.highWaterMark) { - doRead = true; - debug('length less than watermark', doRead); - } + if (ret === null) { + state.needReadable = true; + n = 0; + } else { + state.length -= n; + } - // however, if we've ended, then there's no point, and if we're already - // reading, then it's unnecessary. - if (state.ended || state.reading) { - doRead = false; - debug('reading or ended', doRead); - } else if (doRead) { - debug('do read'); - state.reading = true; - state.sync = true; - // if the length is currently zero, then we *need* a readable event. - if (state.length === 0) state.needReadable = true; - // call internal read method - this._read(state.highWaterMark); - state.sync = false; - // If _read pushed data synchronously, then `reading` will be false, - // and we need to re-evaluate how much data we can return to the user. - if (!state.reading) n = howMuchToRead(nOrig, state); - } + if (state.length === 0) { + // If we have nothing in the buffer, then we want to know + // as soon as we *do* get something into the buffer. + if (!state.ended) state.needReadable = true; - var ret; - if (n > 0) ret = fromList(n, state);else ret = null; + // If we tried to read() past the EOF, then emit end on the next tick. + if (nOrig !== n && state.ended) endReadable(this); + } - if (ret === null) { - state.needReadable = true; - n = 0; - } else { - state.length -= n; - } + if (ret !== null) this.emit('data', ret); - if (state.length === 0) { - // If we have nothing in the buffer, then we want to know - // as soon as we *do* get something into the buffer. - if (!state.ended) state.needReadable = true; + return ret; + }; - // If we tried to read() past the EOF, then emit end on the next tick. - if (nOrig !== n && state.ended) endReadable(this); - } + function chunkInvalid(state, chunk) { + var er = null; + if (!isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) { + er = new TypeError('Invalid non-string/buffer chunk'); + } + return er; + } - if (ret !== null) this.emit('data', ret); + function onEofChunk(stream, state) { + if (state.ended) return; + if (state.decoder) { + var chunk = state.decoder.end(); + if (chunk && chunk.length) { + state.buffer.push(chunk); + state.length += state.objectMode ? 1 : chunk.length; + } + } + state.ended = true; + + // emit 'readable' now to make sure it gets picked up. + emitReadable(stream); + } + + // Don't emit readable right away in sync mode, because this can trigger + // another read() call => stack overflow. This way, it might trigger + // a nextTick recursion warning, but that's not so bad. + function emitReadable(stream) { + var state = stream._readableState; + state.needReadable = false; + if (!state.emittedReadable) { + debug('emitReadable', state.flowing); + state.emittedReadable = true; + if (state.sync) nextTick(emitReadable_, stream);else emitReadable_(stream); + } + } - return ret; - }; + function emitReadable_(stream) { + debug('emit readable'); + stream.emit('readable'); + flow(stream); + } - function chunkInvalid(state, chunk) { - var er = null; - if (!isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) { - er = new TypeError('Invalid non-string/buffer chunk'); - } - return er; - } + // at this point, the user has presumably seen the 'readable' event, + // and called read() to consume some data. that may have triggered + // in turn another _read(n) call, in which case reading = true if + // it's in progress. + // However, if we're not ended, or reading, and the length < hwm, + // then go ahead and try to read some more preemptively. + function maybeReadMore(stream, state) { + if (!state.readingMore) { + state.readingMore = true; + nextTick(maybeReadMore_, stream, state); + } + } - function onEofChunk(stream, state) { - if (state.ended) return; - if (state.decoder) { - var chunk = state.decoder.end(); - if (chunk && chunk.length) { - state.buffer.push(chunk); - state.length += state.objectMode ? 1 : chunk.length; + function maybeReadMore_(stream, state) { + var len = state.length; + while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) { + debug('maybeReadMore read 0'); + stream.read(0); + if (len === state.length) + // didn't get any data, stop spinning. + break;else len = state.length; + } + state.readingMore = false; } - } - state.ended = true; - // emit 'readable' now to make sure it gets picked up. - emitReadable(stream); - } + // abstract method. to be overridden in specific implementation classes. + // call cb(er, data) where data is <= n in length. + // for virtual (non-string, non-buffer) streams, "length" is somewhat + // arbitrary, and perhaps not very meaningful. + Readable.prototype._read = function (n) { + this.emit('error', new Error('not implemented')); + }; - // Don't emit readable right away in sync mode, because this can trigger - // another read() call => stack overflow. This way, it might trigger - // a nextTick recursion warning, but that's not so bad. - function emitReadable(stream) { - var state = stream._readableState; - state.needReadable = false; - if (!state.emittedReadable) { - debug('emitReadable', state.flowing); - state.emittedReadable = true; - if (state.sync) nextTick(emitReadable_, stream);else emitReadable_(stream); - } - } + Readable.prototype.pipe = function (dest, pipeOpts) { + var src = this; + var state = this._readableState; - function emitReadable_(stream) { - debug('emit readable'); - stream.emit('readable'); - flow(stream); - } + switch (state.pipesCount) { + case 0: + state.pipes = dest; + break; + case 1: + state.pipes = [state.pipes, dest]; + break; + default: + state.pipes.push(dest); + break; + } + state.pipesCount += 1; + debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts); - // at this point, the user has presumably seen the 'readable' event, - // and called read() to consume some data. that may have triggered - // in turn another _read(n) call, in which case reading = true if - // it's in progress. - // However, if we're not ended, or reading, and the length < hwm, - // then go ahead and try to read some more preemptively. - function maybeReadMore(stream, state) { - if (!state.readingMore) { - state.readingMore = true; - nextTick(maybeReadMore_, stream, state); - } - } + var doEnd = (!pipeOpts || pipeOpts.end !== false); - function maybeReadMore_(stream, state) { - var len = state.length; - while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) { - debug('maybeReadMore read 0'); - stream.read(0); - if (len === state.length) - // didn't get any data, stop spinning. - break;else len = state.length; - } - state.readingMore = false; - } + var endFn = doEnd ? onend : cleanup; + if (state.endEmitted) nextTick(endFn);else src.once('end', endFn); - // abstract method. to be overridden in specific implementation classes. - // call cb(er, data) where data is <= n in length. - // for virtual (non-string, non-buffer) streams, "length" is somewhat - // arbitrary, and perhaps not very meaningful. - Readable.prototype._read = function (n) { - this.emit('error', new Error('not implemented')); - }; + dest.on('unpipe', onunpipe); + function onunpipe(readable) { + debug('onunpipe'); + if (readable === src) { + cleanup(); + } + } - Readable.prototype.pipe = function (dest, pipeOpts) { - var src = this; - var state = this._readableState; - - switch (state.pipesCount) { - case 0: - state.pipes = dest; - break; - case 1: - state.pipes = [state.pipes, dest]; - break; - default: - state.pipes.push(dest); - break; - } - state.pipesCount += 1; - debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts); + function onend() { + debug('onend'); + dest.end(); + } - var doEnd = (!pipeOpts || pipeOpts.end !== false); + // when the dest drains, it reduces the awaitDrain counter + // on the source. This would be more elegant with a .once() + // handler in flow(), but adding and removing repeatedly is + // too slow. + var ondrain = pipeOnDrain(src); + dest.on('drain', ondrain); + + var cleanedUp = false; + function cleanup() { + debug('cleanup'); + // cleanup event handlers once the pipe is broken + dest.removeListener('close', onclose); + dest.removeListener('finish', onfinish); + dest.removeListener('drain', ondrain); + dest.removeListener('error', onerror); + dest.removeListener('unpipe', onunpipe); + src.removeListener('end', onend); + src.removeListener('end', cleanup); + src.removeListener('data', ondata); + + cleanedUp = true; + + // if the reader is waiting for a drain event from this + // specific writer, then it would cause it to never start + // flowing again. + // So, if this is awaiting a drain, then we just call it now. + // If we don't know, then assume that we are waiting for one. + if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain(); + } - var endFn = doEnd ? onend : cleanup; - if (state.endEmitted) nextTick(endFn);else src.once('end', endFn); + // If the user pushes more data while we're writing to dest then we'll end up + // in ondata again. However, we only want to increase awaitDrain once because + // dest will only emit one 'drain' event for the multiple writes. + // => Introduce a guard on increasing awaitDrain. + var increasedAwaitDrain = false; + src.on('data', ondata); + function ondata(chunk) { + debug('ondata'); + increasedAwaitDrain = false; + var ret = dest.write(chunk); + if (false === ret && !increasedAwaitDrain) { + // If the user unpiped during `dest.write()`, it is possible + // to get stuck in a permanently paused state if that write + // also returned false. + // => Check whether `dest` is still a piping destination. + if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) { + debug('false write response, pause', src._readableState.awaitDrain); + src._readableState.awaitDrain++; + increasedAwaitDrain = true; + } + src.pause(); + } + } - dest.on('unpipe', onunpipe); - function onunpipe(readable) { - debug('onunpipe'); - if (readable === src) { - cleanup(); - } - } + // if the dest has an error, then stop piping into it. + // however, don't suppress the throwing behavior for this. + function onerror(er) { + debug('onerror', er); + unpipe(); + dest.removeListener('error', onerror); + if (listenerCount$1(dest, 'error') === 0) dest.emit('error', er); + } - function onend() { - debug('onend'); - dest.end(); - } + // Make sure our error handler is attached before userland ones. + prependListener(dest, 'error', onerror); - // when the dest drains, it reduces the awaitDrain counter - // on the source. This would be more elegant with a .once() - // handler in flow(), but adding and removing repeatedly is - // too slow. - var ondrain = pipeOnDrain(src); - dest.on('drain', ondrain); - - var cleanedUp = false; - function cleanup() { - debug('cleanup'); - // cleanup event handlers once the pipe is broken - dest.removeListener('close', onclose); - dest.removeListener('finish', onfinish); - dest.removeListener('drain', ondrain); - dest.removeListener('error', onerror); - dest.removeListener('unpipe', onunpipe); - src.removeListener('end', onend); - src.removeListener('end', cleanup); - src.removeListener('data', ondata); - - cleanedUp = true; - - // if the reader is waiting for a drain event from this - // specific writer, then it would cause it to never start - // flowing again. - // So, if this is awaiting a drain, then we just call it now. - // If we don't know, then assume that we are waiting for one. - if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain(); - } + // Both close and finish should trigger unpipe, but only once. + function onclose() { + dest.removeListener('finish', onfinish); + unpipe(); + } + dest.once('close', onclose); + function onfinish() { + debug('onfinish'); + dest.removeListener('close', onclose); + unpipe(); + } + dest.once('finish', onfinish); - // If the user pushes more data while we're writing to dest then we'll end up - // in ondata again. However, we only want to increase awaitDrain once because - // dest will only emit one 'drain' event for the multiple writes. - // => Introduce a guard on increasing awaitDrain. - var increasedAwaitDrain = false; - src.on('data', ondata); - function ondata(chunk) { - debug('ondata'); - increasedAwaitDrain = false; - var ret = dest.write(chunk); - if (false === ret && !increasedAwaitDrain) { - // If the user unpiped during `dest.write()`, it is possible - // to get stuck in a permanently paused state if that write - // also returned false. - // => Check whether `dest` is still a piping destination. - if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) { - debug('false write response, pause', src._readableState.awaitDrain); - src._readableState.awaitDrain++; - increasedAwaitDrain = true; - } - src.pause(); - } - } + function unpipe() { + debug('unpipe'); + src.unpipe(dest); + } - // if the dest has an error, then stop piping into it. - // however, don't suppress the throwing behavior for this. - function onerror(er) { - debug('onerror', er); - unpipe(); - dest.removeListener('error', onerror); - if (listenerCount$1(dest, 'error') === 0) dest.emit('error', er); - } + // tell the dest that it's being piped to + dest.emit('pipe', src); - // Make sure our error handler is attached before userland ones. - prependListener(dest, 'error', onerror); + // start the flow if it hasn't been started already. + if (!state.flowing) { + debug('pipe resume'); + src.resume(); + } - // Both close and finish should trigger unpipe, but only once. - function onclose() { - dest.removeListener('finish', onfinish); - unpipe(); - } - dest.once('close', onclose); - function onfinish() { - debug('onfinish'); - dest.removeListener('close', onclose); - unpipe(); - } - dest.once('finish', onfinish); + return dest; + }; - function unpipe() { - debug('unpipe'); - src.unpipe(dest); - } + function pipeOnDrain(src) { + return function () { + var state = src._readableState; + debug('pipeOnDrain', state.awaitDrain); + if (state.awaitDrain) state.awaitDrain--; + if (state.awaitDrain === 0 && src.listeners('data').length) { + state.flowing = true; + flow(src); + } + }; + } - // tell the dest that it's being piped to - dest.emit('pipe', src); + Readable.prototype.unpipe = function (dest) { + var state = this._readableState; - // start the flow if it hasn't been started already. - if (!state.flowing) { - debug('pipe resume'); - src.resume(); - } + // if we're not piping anywhere, then do nothing. + if (state.pipesCount === 0) return this; - return dest; - }; + // just one destination. most common case. + if (state.pipesCount === 1) { + // passed in one, but it's not the right one. + if (dest && dest !== state.pipes) return this; - function pipeOnDrain(src) { - return function () { - var state = src._readableState; - debug('pipeOnDrain', state.awaitDrain); - if (state.awaitDrain) state.awaitDrain--; - if (state.awaitDrain === 0 && src.listeners('data').length) { - state.flowing = true; - flow(src); - } - }; - } + if (!dest) dest = state.pipes; - Readable.prototype.unpipe = function (dest) { - var state = this._readableState; + // got a match. + state.pipes = null; + state.pipesCount = 0; + state.flowing = false; + if (dest) dest.emit('unpipe', this); + return this; + } - // if we're not piping anywhere, then do nothing. - if (state.pipesCount === 0) return this; + // slow case. multiple pipe destinations. - // just one destination. most common case. - if (state.pipesCount === 1) { - // passed in one, but it's not the right one. - if (dest && dest !== state.pipes) return this; + if (!dest) { + // remove all. + var dests = state.pipes; + var len = state.pipesCount; + state.pipes = null; + state.pipesCount = 0; + state.flowing = false; - if (!dest) dest = state.pipes; + for (var _i = 0; _i < len; _i++) { + dests[_i].emit('unpipe', this); + }return this; + } - // got a match. - state.pipes = null; - state.pipesCount = 0; - state.flowing = false; - if (dest) dest.emit('unpipe', this); - return this; - } + // try to find the right one. + var i = indexOf(state.pipes, dest); + if (i === -1) return this; - // slow case. multiple pipe destinations. + state.pipes.splice(i, 1); + state.pipesCount -= 1; + if (state.pipesCount === 1) state.pipes = state.pipes[0]; - if (!dest) { - // remove all. - var dests = state.pipes; - var len = state.pipesCount; - state.pipes = null; - state.pipesCount = 0; - state.flowing = false; + dest.emit('unpipe', this); - for (var _i = 0; _i < len; _i++) { - dests[_i].emit('unpipe', this); - }return this; - } + return this; + }; - // try to find the right one. - var i = indexOf(state.pipes, dest); - if (i === -1) return this; + // set up data events if they are asked for + // Ensure readable listeners eventually get something + Readable.prototype.on = function (ev, fn) { + var res = EventEmitter.prototype.on.call(this, ev, fn); + + if (ev === 'data') { + // Start flowing on next tick if stream isn't explicitly paused + if (this._readableState.flowing !== false) this.resume(); + } else if (ev === 'readable') { + var state = this._readableState; + if (!state.endEmitted && !state.readableListening) { + state.readableListening = state.needReadable = true; + state.emittedReadable = false; + if (!state.reading) { + nextTick(nReadingNextTick, this); + } else if (state.length) { + emitReadable(this); + } + } + } - state.pipes.splice(i, 1); - state.pipesCount -= 1; - if (state.pipesCount === 1) state.pipes = state.pipes[0]; + return res; + }; + Readable.prototype.addListener = Readable.prototype.on; - dest.emit('unpipe', this); + function nReadingNextTick(self) { + debug('readable nexttick read 0'); + self.read(0); + } - return this; - }; + // pause() and resume() are remnants of the legacy readable stream API + // If the user uses them, then switch into old mode. + Readable.prototype.resume = function () { + var state = this._readableState; + if (!state.flowing) { + debug('resume'); + state.flowing = true; + resume(this, state); + } + return this; + }; - // set up data events if they are asked for - // Ensure readable listeners eventually get something - Readable.prototype.on = function (ev, fn) { - var res = EventEmitter.prototype.on.call(this, ev, fn); - - if (ev === 'data') { - // Start flowing on next tick if stream isn't explicitly paused - if (this._readableState.flowing !== false) this.resume(); - } else if (ev === 'readable') { - var state = this._readableState; - if (!state.endEmitted && !state.readableListening) { - state.readableListening = state.needReadable = true; - state.emittedReadable = false; - if (!state.reading) { - nextTick(nReadingNextTick, this); - } else if (state.length) { - emitReadable(this); + function resume(stream, state) { + if (!state.resumeScheduled) { + state.resumeScheduled = true; + nextTick(resume_, stream, state); } } - } - return res; - }; - Readable.prototype.addListener = Readable.prototype.on; + function resume_(stream, state) { + if (!state.reading) { + debug('resume read 0'); + stream.read(0); + } - function nReadingNextTick(self) { - debug('readable nexttick read 0'); - self.read(0); - } + state.resumeScheduled = false; + state.awaitDrain = 0; + stream.emit('resume'); + flow(stream); + if (state.flowing && !state.reading) stream.read(0); + } - // pause() and resume() are remnants of the legacy readable stream API - // If the user uses them, then switch into old mode. - Readable.prototype.resume = function () { - var state = this._readableState; - if (!state.flowing) { - debug('resume'); - state.flowing = true; - resume(this, state); - } - return this; - }; + Readable.prototype.pause = function () { + debug('call pause flowing=%j', this._readableState.flowing); + if (false !== this._readableState.flowing) { + debug('pause'); + this._readableState.flowing = false; + this.emit('pause'); + } + return this; + }; - function resume(stream, state) { - if (!state.resumeScheduled) { - state.resumeScheduled = true; - nextTick(resume_, stream, state); - } - } + function flow(stream) { + var state = stream._readableState; + debug('flow', state.flowing); + while (state.flowing && stream.read() !== null) {} + } + + // wrap an old-style stream as the async data source. + // This is *not* part of the readable stream interface. + // It is an ugly unfortunate mess of history. + Readable.prototype.wrap = function (stream) { + var state = this._readableState; + var paused = false; + + var self = this; + stream.on('end', function () { + debug('wrapped end'); + if (state.decoder && !state.ended) { + var chunk = state.decoder.end(); + if (chunk && chunk.length) self.push(chunk); + } - function resume_(stream, state) { - if (!state.reading) { - debug('resume read 0'); - stream.read(0); - } + self.push(null); + }); - state.resumeScheduled = false; - state.awaitDrain = 0; - stream.emit('resume'); - flow(stream); - if (state.flowing && !state.reading) stream.read(0); - } + stream.on('data', function (chunk) { + debug('wrapped data'); + if (state.decoder) chunk = state.decoder.write(chunk); - Readable.prototype.pause = function () { - debug('call pause flowing=%j', this._readableState.flowing); - if (false !== this._readableState.flowing) { - debug('pause'); - this._readableState.flowing = false; - this.emit('pause'); - } - return this; - }; + // don't skip over falsy values in objectMode + if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return; - function flow(stream) { - var state = stream._readableState; - debug('flow', state.flowing); - while (state.flowing && stream.read() !== null) {} - } + var ret = self.push(chunk); + if (!ret) { + paused = true; + stream.pause(); + } + }); - // wrap an old-style stream as the async data source. - // This is *not* part of the readable stream interface. - // It is an ugly unfortunate mess of history. - Readable.prototype.wrap = function (stream) { - var state = this._readableState; - var paused = false; + // proxy all the other methods. + // important when wrapping filters and duplexes. + for (var i in stream) { + if (this[i] === undefined && typeof stream[i] === 'function') { + this[i] = function (method) { + return function () { + return stream[method].apply(stream, arguments); + }; + }(i); + } + } - var self = this; - stream.on('end', function () { - debug('wrapped end'); - if (state.decoder && !state.ended) { - var chunk = state.decoder.end(); - if (chunk && chunk.length) self.push(chunk); - } + // proxy certain important events. + var events = ['error', 'close', 'destroy', 'pause', 'resume']; + forEach(events, function (ev) { + stream.on(ev, self.emit.bind(self, ev)); + }); - self.push(null); - }); + // when we try to consume some more bytes, simply unpause the + // underlying stream. + self._read = function (n) { + debug('wrapped _read', n); + if (paused) { + paused = false; + stream.resume(); + } + }; - stream.on('data', function (chunk) { - debug('wrapped data'); - if (state.decoder) chunk = state.decoder.write(chunk); + return self; + }; - // don't skip over falsy values in objectMode - if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return; + // exposed for testing purposes only. + Readable._fromList = fromList; + + // Pluck off n bytes from an array of buffers. + // Length is the combined lengths of all the buffers in the list. + // This function is designed to be inlinable, so please take care when making + // changes to the function body. + function fromList(n, state) { + // nothing buffered + if (state.length === 0) return null; + + var ret; + if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) { + // read it all, truncate the list + if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.head.data;else ret = state.buffer.concat(state.length); + state.buffer.clear(); + } else { + // read part of list + ret = fromListPartial(n, state.buffer, state.decoder); + } - var ret = self.push(chunk); - if (!ret) { - paused = true; - stream.pause(); + return ret; + } + + // Extracts only enough buffered data to satisfy the amount requested. + // This function is designed to be inlinable, so please take care when making + // changes to the function body. + function fromListPartial(n, list, hasStrings) { + var ret; + if (n < list.head.data.length) { + // slice is the same for buffers and strings + ret = list.head.data.slice(0, n); + list.head.data = list.head.data.slice(n); + } else if (n === list.head.data.length) { + // first chunk is a perfect match + ret = list.shift(); + } else { + // result spans more than one buffer + ret = hasStrings ? copyFromBufferString(n, list) : copyFromBuffer(n, list); + } + return ret; + } + + // Copies a specified amount of characters from the list of buffered data + // chunks. + // This function is designed to be inlinable, so please take care when making + // changes to the function body. + function copyFromBufferString(n, list) { + var p = list.head; + var c = 1; + var ret = p.data; + n -= ret.length; + while (p = p.next) { + var str = p.data; + var nb = n > str.length ? str.length : n; + if (nb === str.length) ret += str;else ret += str.slice(0, n); + n -= nb; + if (n === 0) { + if (nb === str.length) { + ++c; + if (p.next) list.head = p.next;else list.head = list.tail = null; + } else { + list.head = p; + p.data = str.slice(nb); + } + break; + } + ++c; + } + list.length -= c; + return ret; + } + + // Copies a specified amount of bytes from the list of buffered data chunks. + // This function is designed to be inlinable, so please take care when making + // changes to the function body. + function copyFromBuffer(n, list) { + var ret = Buffer.allocUnsafe(n); + var p = list.head; + var c = 1; + p.data.copy(ret); + n -= p.data.length; + while (p = p.next) { + var buf = p.data; + var nb = n > buf.length ? buf.length : n; + buf.copy(ret, ret.length - n, 0, nb); + n -= nb; + if (n === 0) { + if (nb === buf.length) { + ++c; + if (p.next) list.head = p.next;else list.head = list.tail = null; + } else { + list.head = p; + p.data = buf.slice(nb); + } + break; + } + ++c; + } + list.length -= c; + return ret; } - }); - // proxy all the other methods. - // important when wrapping filters and duplexes. - for (var i in stream) { - if (this[i] === undefined && typeof stream[i] === 'function') { - this[i] = function (method) { - return function () { - return stream[method].apply(stream, arguments); - }; - }(i); - } - } + function endReadable(stream) { + var state = stream._readableState; - // proxy certain important events. - var events = ['error', 'close', 'destroy', 'pause', 'resume']; - forEach(events, function (ev) { - stream.on(ev, self.emit.bind(self, ev)); - }); + // If we get here before consuming all the bytes, then that is a + // bug in node. Should never happen. + if (state.length > 0) throw new Error('"endReadable()" called on non-empty stream'); - // when we try to consume some more bytes, simply unpause the - // underlying stream. - self._read = function (n) { - debug('wrapped _read', n); - if (paused) { - paused = false; - stream.resume(); + if (!state.endEmitted) { + state.ended = true; + nextTick(endReadableNT, state, stream); + } } - }; - - return self; - }; - - // exposed for testing purposes only. - Readable._fromList = fromList; - - // Pluck off n bytes from an array of buffers. - // Length is the combined lengths of all the buffers in the list. - // This function is designed to be inlinable, so please take care when making - // changes to the function body. - function fromList(n, state) { - // nothing buffered - if (state.length === 0) return null; - - var ret; - if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) { - // read it all, truncate the list - if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.head.data;else ret = state.buffer.concat(state.length); - state.buffer.clear(); - } else { - // read part of list - ret = fromListPartial(n, state.buffer, state.decoder); - } - - return ret; - } - - // Extracts only enough buffered data to satisfy the amount requested. - // This function is designed to be inlinable, so please take care when making - // changes to the function body. - function fromListPartial(n, list, hasStrings) { - var ret; - if (n < list.head.data.length) { - // slice is the same for buffers and strings - ret = list.head.data.slice(0, n); - list.head.data = list.head.data.slice(n); - } else if (n === list.head.data.length) { - // first chunk is a perfect match - ret = list.shift(); - } else { - // result spans more than one buffer - ret = hasStrings ? copyFromBufferString(n, list) : copyFromBuffer(n, list); - } - return ret; - } - // Copies a specified amount of characters from the list of buffered data - // chunks. - // This function is designed to be inlinable, so please take care when making - // changes to the function body. - function copyFromBufferString(n, list) { - var p = list.head; - var c = 1; - var ret = p.data; - n -= ret.length; - while (p = p.next) { - var str = p.data; - var nb = n > str.length ? str.length : n; - if (nb === str.length) ret += str;else ret += str.slice(0, n); - n -= nb; - if (n === 0) { - if (nb === str.length) { - ++c; - if (p.next) list.head = p.next;else list.head = list.tail = null; - } else { - list.head = p; - p.data = str.slice(nb); + function endReadableNT(state, stream) { + // Check that we didn't get one last unshift. + if (!state.endEmitted && state.length === 0) { + state.endEmitted = true; + stream.readable = false; + stream.emit('end'); } - break; } - ++c; - } - list.length -= c; - return ret; - } - // Copies a specified amount of bytes from the list of buffered data chunks. - // This function is designed to be inlinable, so please take care when making - // changes to the function body. - function copyFromBuffer(n, list) { - var ret = Buffer.allocUnsafe(n); - var p = list.head; - var c = 1; - p.data.copy(ret); - n -= p.data.length; - while (p = p.next) { - var buf = p.data; - var nb = n > buf.length ? buf.length : n; - buf.copy(ret, ret.length - n, 0, nb); - n -= nb; - if (n === 0) { - if (nb === buf.length) { - ++c; - if (p.next) list.head = p.next;else list.head = list.tail = null; - } else { - list.head = p; - p.data = buf.slice(nb); + function forEach(xs, f) { + for (var i = 0, l = xs.length; i < l; i++) { + f(xs[i], i); } - break; } - ++c; - } - list.length -= c; - return ret; - } - - function endReadable(stream) { - var state = stream._readableState; - - // If we get here before consuming all the bytes, then that is a - // bug in node. Should never happen. - if (state.length > 0) throw new Error('"endReadable()" called on non-empty stream'); - if (!state.endEmitted) { - state.ended = true; - nextTick(endReadableNT, state, stream); - } - } - - function endReadableNT(state, stream) { - // Check that we didn't get one last unshift. - if (!state.endEmitted && state.length === 0) { - state.endEmitted = true; - stream.readable = false; - stream.emit('end'); - } - } + function indexOf(xs, x) { + for (var i = 0, l = xs.length; i < l; i++) { + if (xs[i] === x) return i; + } + return -1; + } - function forEach(xs, f) { - for (var i = 0, l = xs.length; i < l; i++) { - f(xs[i], i); - } - } + // A bit simpler than readable streams. + Writable.WritableState = WritableState; + inherits$1(Writable, EventEmitter); - function indexOf(xs, x) { - for (var i = 0, l = xs.length; i < l; i++) { - if (xs[i] === x) return i; - } - return -1; - } + function nop() {} - // A bit simpler than readable streams. - Writable.WritableState = WritableState; - inherits$1(Writable, EventEmitter); + function WriteReq(chunk, encoding, cb) { + this.chunk = chunk; + this.encoding = encoding; + this.callback = cb; + this.next = null; + } - function nop() {} + function WritableState(options, stream) { + Object.defineProperty(this, 'buffer', { + get: deprecate(function () { + return this.getBuffer(); + }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.') + }); + options = options || {}; + + // object stream flag to indicate whether or not this stream + // contains buffers or objects. + this.objectMode = !!options.objectMode; + + if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.writableObjectMode; + + // the point at which write() starts returning false + // Note: 0 is a valid value, means that we always return false if + // the entire buffer is not flushed immediately on write() + var hwm = options.highWaterMark; + var defaultHwm = this.objectMode ? 16 : 16 * 1024; + this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm; + + // cast to ints. + this.highWaterMark = ~ ~this.highWaterMark; + + this.needDrain = false; + // at the start of calling end() + this.ending = false; + // when end() has been called, and returned + this.ended = false; + // when 'finish' is emitted + this.finished = false; + + // should we decode strings into buffers before passing to _write? + // this is here so that some node-core streams can optimize string + // handling at a lower level. + var noDecode = options.decodeStrings === false; + this.decodeStrings = !noDecode; + + // Crypto is kind of old and crusty. Historically, its default string + // encoding is 'binary' so we have to make this configurable. + // Everything else in the universe uses 'utf8', though. + this.defaultEncoding = options.defaultEncoding || 'utf8'; + + // not an actual buffer we keep track of, but a measurement + // of how much we're waiting to get pushed to some underlying + // socket or file. + this.length = 0; + + // a flag to see when we're in the middle of a write. + this.writing = false; + + // when true all writes will be buffered until .uncork() call + this.corked = 0; + + // a flag to be able to tell if the onwrite cb is called immediately, + // or on a later tick. We set this to true at first, because any + // actions that shouldn't happen until "later" should generally also + // not happen before the first write call. + this.sync = true; + + // a flag to know if we're processing previously buffered items, which + // may call the _write() callback in the same tick, so that we don't + // end up in an overlapped onwrite situation. + this.bufferProcessing = false; + + // the callback that's passed to _write(chunk,cb) + this.onwrite = function (er) { + onwrite(stream, er); + }; - function WriteReq(chunk, encoding, cb) { - this.chunk = chunk; - this.encoding = encoding; - this.callback = cb; - this.next = null; - } + // the callback that the user supplies to write(chunk,encoding,cb) + this.writecb = null; - function WritableState(options, stream) { - Object.defineProperty(this, 'buffer', { - get: deprecate(function () { - return this.getBuffer(); - }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.') - }); - options = options || {}; - - // object stream flag to indicate whether or not this stream - // contains buffers or objects. - this.objectMode = !!options.objectMode; - - if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.writableObjectMode; - - // the point at which write() starts returning false - // Note: 0 is a valid value, means that we always return false if - // the entire buffer is not flushed immediately on write() - var hwm = options.highWaterMark; - var defaultHwm = this.objectMode ? 16 : 16 * 1024; - this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm; - - // cast to ints. - this.highWaterMark = ~ ~this.highWaterMark; - - this.needDrain = false; - // at the start of calling end() - this.ending = false; - // when end() has been called, and returned - this.ended = false; - // when 'finish' is emitted - this.finished = false; - - // should we decode strings into buffers before passing to _write? - // this is here so that some node-core streams can optimize string - // handling at a lower level. - var noDecode = options.decodeStrings === false; - this.decodeStrings = !noDecode; - - // Crypto is kind of old and crusty. Historically, its default string - // encoding is 'binary' so we have to make this configurable. - // Everything else in the universe uses 'utf8', though. - this.defaultEncoding = options.defaultEncoding || 'utf8'; - - // not an actual buffer we keep track of, but a measurement - // of how much we're waiting to get pushed to some underlying - // socket or file. - this.length = 0; - - // a flag to see when we're in the middle of a write. - this.writing = false; - - // when true all writes will be buffered until .uncork() call - this.corked = 0; - - // a flag to be able to tell if the onwrite cb is called immediately, - // or on a later tick. We set this to true at first, because any - // actions that shouldn't happen until "later" should generally also - // not happen before the first write call. - this.sync = true; - - // a flag to know if we're processing previously buffered items, which - // may call the _write() callback in the same tick, so that we don't - // end up in an overlapped onwrite situation. - this.bufferProcessing = false; - - // the callback that's passed to _write(chunk,cb) - this.onwrite = function (er) { - onwrite(stream, er); - }; - - // the callback that the user supplies to write(chunk,encoding,cb) - this.writecb = null; - - // the amount that is being written when _write is called. - this.writelen = 0; - - this.bufferedRequest = null; - this.lastBufferedRequest = null; - - // number of pending user-supplied write callbacks - // this must be 0 before 'finish' can be emitted - this.pendingcb = 0; - - // emit prefinish if the only thing we're waiting for is _write cbs - // This is relevant for synchronous Transform streams - this.prefinished = false; - - // True if the error was already emitted and should not be thrown again - this.errorEmitted = false; - - // count buffered requests - this.bufferedRequestCount = 0; - - // allocate the first CorkedRequest, there is always - // one allocated and free to use, and we maintain at most two - this.corkedRequestsFree = new CorkedRequest(this); - } + // the amount that is being written when _write is called. + this.writelen = 0; - WritableState.prototype.getBuffer = function writableStateGetBuffer() { - var current = this.bufferedRequest; - var out = []; - while (current) { - out.push(current); - current = current.next; - } - return out; - }; - function Writable(options) { + this.bufferedRequest = null; + this.lastBufferedRequest = null; - // Writable ctor is applied to Duplexes, though they're not - // instanceof Writable, they're instanceof Readable. - if (!(this instanceof Writable) && !(this instanceof Duplex)) return new Writable(options); + // number of pending user-supplied write callbacks + // this must be 0 before 'finish' can be emitted + this.pendingcb = 0; - this._writableState = new WritableState(options, this); + // emit prefinish if the only thing we're waiting for is _write cbs + // This is relevant for synchronous Transform streams + this.prefinished = false; - // legacy. - this.writable = true; + // True if the error was already emitted and should not be thrown again + this.errorEmitted = false; - if (options) { - if (typeof options.write === 'function') this._write = options.write; + // count buffered requests + this.bufferedRequestCount = 0; - if (typeof options.writev === 'function') this._writev = options.writev; - } + // allocate the first CorkedRequest, there is always + // one allocated and free to use, and we maintain at most two + this.corkedRequestsFree = new CorkedRequest(this); + } - EventEmitter.call(this); - } + WritableState.prototype.getBuffer = function writableStateGetBuffer() { + var current = this.bufferedRequest; + var out = []; + while (current) { + out.push(current); + current = current.next; + } + return out; + }; + function Writable(options) { - // Otherwise people can pipe Writable streams, which is just wrong. - Writable.prototype.pipe = function () { - this.emit('error', new Error('Cannot pipe, not readable')); - }; + // Writable ctor is applied to Duplexes, though they're not + // instanceof Writable, they're instanceof Readable. + if (!(this instanceof Writable) && !(this instanceof Duplex)) return new Writable(options); - function writeAfterEnd(stream, cb) { - var er = new Error('write after end'); - // TODO: defer error events consistently everywhere, not just the cb - stream.emit('error', er); - nextTick(cb, er); - } + this._writableState = new WritableState(options, this); - // If we get something that is not a buffer, string, null, or undefined, - // and we're not in objectMode, then that's an error. - // Otherwise stream chunks are all considered to be of length=1, and the - // watermarks determine how many objects to keep in the buffer, rather than - // how many bytes or characters. - function validChunk(stream, state, chunk, cb) { - var valid = true; - var er = false; - // Always throw error if a null is written - // if we are not in object mode then throw - // if it is not a buffer, string, or undefined. - if (chunk === null) { - er = new TypeError('May not write null values to stream'); - } else if (!Buffer$1.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) { - er = new TypeError('Invalid non-string/buffer chunk'); - } - if (er) { - stream.emit('error', er); - nextTick(cb, er); - valid = false; - } - return valid; - } + // legacy. + this.writable = true; - Writable.prototype.write = function (chunk, encoding, cb) { - var state = this._writableState; - var ret = false; + if (options) { + if (typeof options.write === 'function') this._write = options.write; - if (typeof encoding === 'function') { - cb = encoding; - encoding = null; - } + if (typeof options.writev === 'function') this._writev = options.writev; + } - if (Buffer$1.isBuffer(chunk)) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding; + EventEmitter.call(this); + } - if (typeof cb !== 'function') cb = nop; + // Otherwise people can pipe Writable streams, which is just wrong. + Writable.prototype.pipe = function () { + this.emit('error', new Error('Cannot pipe, not readable')); + }; - if (state.ended) writeAfterEnd(this, cb);else if (validChunk(this, state, chunk, cb)) { - state.pendingcb++; - ret = writeOrBuffer(this, state, chunk, encoding, cb); - } + function writeAfterEnd(stream, cb) { + var er = new Error('write after end'); + // TODO: defer error events consistently everywhere, not just the cb + stream.emit('error', er); + nextTick(cb, er); + } + + // If we get something that is not a buffer, string, null, or undefined, + // and we're not in objectMode, then that's an error. + // Otherwise stream chunks are all considered to be of length=1, and the + // watermarks determine how many objects to keep in the buffer, rather than + // how many bytes or characters. + function validChunk(stream, state, chunk, cb) { + var valid = true; + var er = false; + // Always throw error if a null is written + // if we are not in object mode then throw + // if it is not a buffer, string, or undefined. + if (chunk === null) { + er = new TypeError('May not write null values to stream'); + } else if (!Buffer$1.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) { + er = new TypeError('Invalid non-string/buffer chunk'); + } + if (er) { + stream.emit('error', er); + nextTick(cb, er); + valid = false; + } + return valid; + } - return ret; - }; + Writable.prototype.write = function (chunk, encoding, cb) { + var state = this._writableState; + var ret = false; - Writable.prototype.cork = function () { - var state = this._writableState; + if (typeof encoding === 'function') { + cb = encoding; + encoding = null; + } - state.corked++; - }; + if (Buffer$1.isBuffer(chunk)) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding; - Writable.prototype.uncork = function () { - var state = this._writableState; + if (typeof cb !== 'function') cb = nop; - if (state.corked) { - state.corked--; + if (state.ended) writeAfterEnd(this, cb);else if (validChunk(this, state, chunk, cb)) { + state.pendingcb++; + ret = writeOrBuffer(this, state, chunk, encoding, cb); + } - if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state); - } - }; + return ret; + }; - Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) { - // node::ParseEncoding() requires lower case. - if (typeof encoding === 'string') encoding = encoding.toLowerCase(); - if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding); - this._writableState.defaultEncoding = encoding; - return this; - }; + Writable.prototype.cork = function () { + var state = this._writableState; - function decodeChunk(state, chunk, encoding) { - if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') { - chunk = Buffer$1.from(chunk, encoding); - } - return chunk; - } + state.corked++; + }; - // if we're already writing something, then just put this - // in the queue, and wait our turn. Otherwise, call _write - // If we return false, then we need a drain event, so set that flag. - function writeOrBuffer(stream, state, chunk, encoding, cb) { - chunk = decodeChunk(state, chunk, encoding); + Writable.prototype.uncork = function () { + var state = this._writableState; - if (Buffer$1.isBuffer(chunk)) encoding = 'buffer'; - var len = state.objectMode ? 1 : chunk.length; + if (state.corked) { + state.corked--; - state.length += len; + if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state); + } + }; - var ret = state.length < state.highWaterMark; - // we must ensure that previous needDrain will not be reset to false. - if (!ret) state.needDrain = true; + Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) { + // node::ParseEncoding() requires lower case. + if (typeof encoding === 'string') encoding = encoding.toLowerCase(); + if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding); + this._writableState.defaultEncoding = encoding; + return this; + }; - if (state.writing || state.corked) { - var last = state.lastBufferedRequest; - state.lastBufferedRequest = new WriteReq(chunk, encoding, cb); - if (last) { - last.next = state.lastBufferedRequest; - } else { - state.bufferedRequest = state.lastBufferedRequest; + function decodeChunk(state, chunk, encoding) { + if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') { + chunk = Buffer$1.from(chunk, encoding); + } + return chunk; } - state.bufferedRequestCount += 1; - } else { - doWrite(stream, state, false, len, chunk, encoding, cb); - } - return ret; - } + // if we're already writing something, then just put this + // in the queue, and wait our turn. Otherwise, call _write + // If we return false, then we need a drain event, so set that flag. + function writeOrBuffer(stream, state, chunk, encoding, cb) { + chunk = decodeChunk(state, chunk, encoding); - function doWrite(stream, state, writev, len, chunk, encoding, cb) { - state.writelen = len; - state.writecb = cb; - state.writing = true; - state.sync = true; - if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite); - state.sync = false; - } + if (Buffer$1.isBuffer(chunk)) encoding = 'buffer'; + var len = state.objectMode ? 1 : chunk.length; - function onwriteError(stream, state, sync, er, cb) { - --state.pendingcb; - if (sync) nextTick(cb, er);else cb(er); + state.length += len; - stream._writableState.errorEmitted = true; - stream.emit('error', er); - } + var ret = state.length < state.highWaterMark; + // we must ensure that previous needDrain will not be reset to false. + if (!ret) state.needDrain = true; - function onwriteStateUpdate(state) { - state.writing = false; - state.writecb = null; - state.length -= state.writelen; - state.writelen = 0; - } + if (state.writing || state.corked) { + var last = state.lastBufferedRequest; + state.lastBufferedRequest = new WriteReq(chunk, encoding, cb); + if (last) { + last.next = state.lastBufferedRequest; + } else { + state.bufferedRequest = state.lastBufferedRequest; + } + state.bufferedRequestCount += 1; + } else { + doWrite(stream, state, false, len, chunk, encoding, cb); + } - function onwrite(stream, er) { - var state = stream._writableState; - var sync = state.sync; - var cb = state.writecb; + return ret; + } - onwriteStateUpdate(state); + function doWrite(stream, state, writev, len, chunk, encoding, cb) { + state.writelen = len; + state.writecb = cb; + state.writing = true; + state.sync = true; + if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite); + state.sync = false; + } - if (er) onwriteError(stream, state, sync, er, cb);else { - // Check if we're actually ready to finish, but don't emit yet - var finished = needFinish(state); + function onwriteError(stream, state, sync, er, cb) { + --state.pendingcb; + if (sync) nextTick(cb, er);else cb(er); - if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) { - clearBuffer(stream, state); + stream._writableState.errorEmitted = true; + stream.emit('error', er); } - if (sync) { - /*<replacement>*/ - nextTick(afterWrite, stream, state, finished, cb); - /*</replacement>*/ - } else { - afterWrite(stream, state, finished, cb); - } - } - } + function onwriteStateUpdate(state) { + state.writing = false; + state.writecb = null; + state.length -= state.writelen; + state.writelen = 0; + } - function afterWrite(stream, state, finished, cb) { - if (!finished) onwriteDrain(stream, state); - state.pendingcb--; - cb(); - finishMaybe(stream, state); - } + function onwrite(stream, er) { + var state = stream._writableState; + var sync = state.sync; + var cb = state.writecb; - // Must force callback to be called on nextTick, so that we don't - // emit 'drain' before the write() consumer gets the 'false' return - // value, and has a chance to attach a 'drain' listener. - function onwriteDrain(stream, state) { - if (state.length === 0 && state.needDrain) { - state.needDrain = false; - stream.emit('drain'); - } - } + onwriteStateUpdate(state); - // if there's something in the buffer waiting, then process it - function clearBuffer(stream, state) { - state.bufferProcessing = true; - var entry = state.bufferedRequest; - - if (stream._writev && entry && entry.next) { - // Fast case, write everything using _writev() - var l = state.bufferedRequestCount; - var buffer = new Array(l); - var holder = state.corkedRequestsFree; - holder.entry = entry; - - var count = 0; - while (entry) { - buffer[count] = entry; - entry = entry.next; - count += 1; - } - - doWrite(stream, state, true, state.length, buffer, '', holder.finish); - - // doWrite is almost always async, defer these to save a bit of time - // as the hot path ends with doWrite - state.pendingcb++; - state.lastBufferedRequest = null; - if (holder.next) { - state.corkedRequestsFree = holder.next; - holder.next = null; - } else { - state.corkedRequestsFree = new CorkedRequest(state); - } - } else { - // Slow case, write chunks one-by-one - while (entry) { - var chunk = entry.chunk; - var encoding = entry.encoding; - var cb = entry.callback; - var len = state.objectMode ? 1 : chunk.length; + if (er) onwriteError(stream, state, sync, er, cb);else { + // Check if we're actually ready to finish, but don't emit yet + var finished = needFinish(state); - doWrite(stream, state, false, len, chunk, encoding, cb); - entry = entry.next; - // if we didn't call the onwrite immediately, then - // it means that we need to wait until it does. - // also, that means that the chunk and cb are currently - // being processed, so move the buffer counter past them. - if (state.writing) { - break; + if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) { + clearBuffer(stream, state); + } + + if (sync) { + /*<replacement>*/ + nextTick(afterWrite, stream, state, finished, cb); + /*</replacement>*/ + } else { + afterWrite(stream, state, finished, cb); + } } } - if (entry === null) state.lastBufferedRequest = null; - } - - state.bufferedRequestCount = 0; - state.bufferedRequest = entry; - state.bufferProcessing = false; - } - - Writable.prototype._write = function (chunk, encoding, cb) { - cb(new Error('not implemented')); - }; - - Writable.prototype._writev = null; + function afterWrite(stream, state, finished, cb) { + if (!finished) onwriteDrain(stream, state); + state.pendingcb--; + cb(); + finishMaybe(stream, state); + } - Writable.prototype.end = function (chunk, encoding, cb) { - var state = this._writableState; + // Must force callback to be called on nextTick, so that we don't + // emit 'drain' before the write() consumer gets the 'false' return + // value, and has a chance to attach a 'drain' listener. + function onwriteDrain(stream, state) { + if (state.length === 0 && state.needDrain) { + state.needDrain = false; + stream.emit('drain'); + } + } - if (typeof chunk === 'function') { - cb = chunk; - chunk = null; - encoding = null; - } else if (typeof encoding === 'function') { - cb = encoding; - encoding = null; - } + // if there's something in the buffer waiting, then process it + function clearBuffer(stream, state) { + state.bufferProcessing = true; + var entry = state.bufferedRequest; - if (chunk !== null && chunk !== undefined) this.write(chunk, encoding); + if (stream._writev && entry && entry.next) { + // Fast case, write everything using _writev() + var l = state.bufferedRequestCount; + var buffer = new Array(l); + var holder = state.corkedRequestsFree; + holder.entry = entry; - // .end() fully uncorks - if (state.corked) { - state.corked = 1; - this.uncork(); - } + var count = 0; + while (entry) { + buffer[count] = entry; + entry = entry.next; + count += 1; + } - // ignore unnecessary end() calls. - if (!state.ending && !state.finished) endWritable(this, state, cb); - }; + doWrite(stream, state, true, state.length, buffer, '', holder.finish); - function needFinish(state) { - return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing; - } + // doWrite is almost always async, defer these to save a bit of time + // as the hot path ends with doWrite + state.pendingcb++; + state.lastBufferedRequest = null; + if (holder.next) { + state.corkedRequestsFree = holder.next; + holder.next = null; + } else { + state.corkedRequestsFree = new CorkedRequest(state); + } + } else { + // Slow case, write chunks one-by-one + while (entry) { + var chunk = entry.chunk; + var encoding = entry.encoding; + var cb = entry.callback; + var len = state.objectMode ? 1 : chunk.length; + + doWrite(stream, state, false, len, chunk, encoding, cb); + entry = entry.next; + // if we didn't call the onwrite immediately, then + // it means that we need to wait until it does. + // also, that means that the chunk and cb are currently + // being processed, so move the buffer counter past them. + if (state.writing) { + break; + } + } - function prefinish(stream, state) { - if (!state.prefinished) { - state.prefinished = true; - stream.emit('prefinish'); - } - } + if (entry === null) state.lastBufferedRequest = null; + } - function finishMaybe(stream, state) { - var need = needFinish(state); - if (need) { - if (state.pendingcb === 0) { - prefinish(stream, state); - state.finished = true; - stream.emit('finish'); - } else { - prefinish(stream, state); + state.bufferedRequestCount = 0; + state.bufferedRequest = entry; + state.bufferProcessing = false; } - } - return need; - } - - function endWritable(stream, state, cb) { - state.ending = true; - finishMaybe(stream, state); - if (cb) { - if (state.finished) nextTick(cb);else stream.once('finish', cb); - } - state.ended = true; - stream.writable = false; - } - // It seems a linked list but it is not - // there will be only 2 of these for each stream - function CorkedRequest(state) { - var _this = this; + Writable.prototype._write = function (chunk, encoding, cb) { + cb(new Error('not implemented')); + }; - this.next = null; - this.entry = null; + Writable.prototype._writev = null; - this.finish = function (err) { - var entry = _this.entry; - _this.entry = null; - while (entry) { - var cb = entry.callback; - state.pendingcb--; - cb(err); - entry = entry.next; - } - if (state.corkedRequestsFree) { - state.corkedRequestsFree.next = _this; - } else { - state.corkedRequestsFree = _this; - } - }; - } + Writable.prototype.end = function (chunk, encoding, cb) { + var state = this._writableState; - inherits$1(Duplex, Readable); + if (typeof chunk === 'function') { + cb = chunk; + chunk = null; + encoding = null; + } else if (typeof encoding === 'function') { + cb = encoding; + encoding = null; + } - var keys = Object.keys(Writable.prototype); - for (var v = 0; v < keys.length; v++) { - var method = keys[v]; - if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method]; - } - function Duplex(options) { - if (!(this instanceof Duplex)) return new Duplex(options); + if (chunk !== null && chunk !== undefined) this.write(chunk, encoding); - Readable.call(this, options); - Writable.call(this, options); + // .end() fully uncorks + if (state.corked) { + state.corked = 1; + this.uncork(); + } - if (options && options.readable === false) this.readable = false; + // ignore unnecessary end() calls. + if (!state.ending && !state.finished) endWritable(this, state, cb); + }; - if (options && options.writable === false) this.writable = false; + function needFinish(state) { + return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing; + } - this.allowHalfOpen = true; - if (options && options.allowHalfOpen === false) this.allowHalfOpen = false; + function prefinish(stream, state) { + if (!state.prefinished) { + state.prefinished = true; + stream.emit('prefinish'); + } + } - this.once('end', onend); - } + function finishMaybe(stream, state) { + var need = needFinish(state); + if (need) { + if (state.pendingcb === 0) { + prefinish(stream, state); + state.finished = true; + stream.emit('finish'); + } else { + prefinish(stream, state); + } + } + return need; + } - // the no-half-open enforcer - function onend() { - // if we allow half-open state, or if the writable side ended, - // then we're ok. - if (this.allowHalfOpen || this._writableState.ended) return; + function endWritable(stream, state, cb) { + state.ending = true; + finishMaybe(stream, state); + if (cb) { + if (state.finished) nextTick(cb);else stream.once('finish', cb); + } + state.ended = true; + stream.writable = false; + } + + // It seems a linked list but it is not + // there will be only 2 of these for each stream + function CorkedRequest(state) { + var _this = this; + + this.next = null; + this.entry = null; + + this.finish = function (err) { + var entry = _this.entry; + _this.entry = null; + while (entry) { + var cb = entry.callback; + state.pendingcb--; + cb(err); + entry = entry.next; + } + if (state.corkedRequestsFree) { + state.corkedRequestsFree.next = _this; + } else { + state.corkedRequestsFree = _this; + } + }; + } - // no more data can be written. - // But allow more writes to happen in this tick. - nextTick(onEndNT, this); - } + inherits$1(Duplex, Readable); - function onEndNT(self) { - self.end(); - } + var keys = Object.keys(Writable.prototype); + for (var v = 0; v < keys.length; v++) { + var method = keys[v]; + if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method]; + } + function Duplex(options) { + if (!(this instanceof Duplex)) return new Duplex(options); - // a transform stream is a readable/writable stream where you do - inherits$1(Transform, Duplex); + Readable.call(this, options); + Writable.call(this, options); - function TransformState(stream) { - this.afterTransform = function (er, data) { - return afterTransform(stream, er, data); - }; + if (options && options.readable === false) this.readable = false; - this.needTransform = false; - this.transforming = false; - this.writecb = null; - this.writechunk = null; - this.writeencoding = null; - } + if (options && options.writable === false) this.writable = false; - function afterTransform(stream, er, data) { - var ts = stream._transformState; - ts.transforming = false; + this.allowHalfOpen = true; + if (options && options.allowHalfOpen === false) this.allowHalfOpen = false; - var cb = ts.writecb; + this.once('end', onend); + } - if (!cb) return stream.emit('error', new Error('no writecb in Transform class')); + // the no-half-open enforcer + function onend() { + // if we allow half-open state, or if the writable side ended, + // then we're ok. + if (this.allowHalfOpen || this._writableState.ended) return; - ts.writechunk = null; - ts.writecb = null; + // no more data can be written. + // But allow more writes to happen in this tick. + nextTick(onEndNT, this); + } - if (data !== null && data !== undefined) stream.push(data); + function onEndNT(self) { + self.end(); + } - cb(er); + // a transform stream is a readable/writable stream where you do + inherits$1(Transform, Duplex); - var rs = stream._readableState; - rs.reading = false; - if (rs.needReadable || rs.length < rs.highWaterMark) { - stream._read(rs.highWaterMark); - } - } - function Transform(options) { - if (!(this instanceof Transform)) return new Transform(options); + function TransformState(stream) { + this.afterTransform = function (er, data) { + return afterTransform(stream, er, data); + }; - Duplex.call(this, options); + this.needTransform = false; + this.transforming = false; + this.writecb = null; + this.writechunk = null; + this.writeencoding = null; + } - this._transformState = new TransformState(this); + function afterTransform(stream, er, data) { + var ts = stream._transformState; + ts.transforming = false; - // when the writable side finishes, then flush out anything remaining. - var stream = this; + var cb = ts.writecb; - // start out asking for a readable event once data is transformed. - this._readableState.needReadable = true; + if (!cb) return stream.emit('error', new Error('no writecb in Transform class')); - // we have implemented the _read method, and done the other things - // that Readable wants before the first _read call, so unset the - // sync guard flag. - this._readableState.sync = false; + ts.writechunk = null; + ts.writecb = null; - if (options) { - if (typeof options.transform === 'function') this._transform = options.transform; + if (data !== null && data !== undefined) stream.push(data); - if (typeof options.flush === 'function') this._flush = options.flush; - } + cb(er); - this.once('prefinish', function () { - if (typeof this._flush === 'function') this._flush(function (er) { - done(stream, er); - });else done(stream); - }); - } + var rs = stream._readableState; + rs.reading = false; + if (rs.needReadable || rs.length < rs.highWaterMark) { + stream._read(rs.highWaterMark); + } + } + function Transform(options) { + if (!(this instanceof Transform)) return new Transform(options); - Transform.prototype.push = function (chunk, encoding) { - this._transformState.needTransform = false; - return Duplex.prototype.push.call(this, chunk, encoding); - }; + Duplex.call(this, options); - // This is the part where you do stuff! - // override this function in implementation classes. - // 'chunk' is an input chunk. - // - // Call `push(newChunk)` to pass along transformed output - // to the readable side. You may call 'push' zero or more times. - // - // Call `cb(err)` when you are done with this chunk. If you pass - // an error, then that'll put the hurt on the whole operation. If you - // never call cb(), then you'll never get another chunk. - Transform.prototype._transform = function (chunk, encoding, cb) { - throw new Error('Not implemented'); - }; + this._transformState = new TransformState(this); - Transform.prototype._write = function (chunk, encoding, cb) { - var ts = this._transformState; - ts.writecb = cb; - ts.writechunk = chunk; - ts.writeencoding = encoding; - if (!ts.transforming) { - var rs = this._readableState; - if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark); - } - }; + // when the writable side finishes, then flush out anything remaining. + var stream = this; - // Doesn't matter what the args are here. - // _transform does all the work. - // That we got here means that the readable side wants more data. - Transform.prototype._read = function (n) { - var ts = this._transformState; - - if (ts.writechunk !== null && ts.writecb && !ts.transforming) { - ts.transforming = true; - this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform); - } else { - // mark that we need a transform, so that any data that comes in - // will get processed, now that we've asked for it. - ts.needTransform = true; - } - }; + // start out asking for a readable event once data is transformed. + this._readableState.needReadable = true; - function done(stream, er) { - if (er) return stream.emit('error', er); + // we have implemented the _read method, and done the other things + // that Readable wants before the first _read call, so unset the + // sync guard flag. + this._readableState.sync = false; - // if there's nothing in the write buffer, then that means - // that nothing more will ever be provided - var ws = stream._writableState; - var ts = stream._transformState; + if (options) { + if (typeof options.transform === 'function') this._transform = options.transform; - if (ws.length) throw new Error('Calling transform done when ws.length != 0'); + if (typeof options.flush === 'function') this._flush = options.flush; + } - if (ts.transforming) throw new Error('Calling transform done when still transforming'); + this.once('prefinish', function () { + if (typeof this._flush === 'function') this._flush(function (er) { + done(stream, er); + });else done(stream); + }); + } - return stream.push(null); - } + Transform.prototype.push = function (chunk, encoding) { + this._transformState.needTransform = false; + return Duplex.prototype.push.call(this, chunk, encoding); + }; - inherits$1(PassThrough, Transform); - function PassThrough(options) { - if (!(this instanceof PassThrough)) return new PassThrough(options); + // This is the part where you do stuff! + // override this function in implementation classes. + // 'chunk' is an input chunk. + // + // Call `push(newChunk)` to pass along transformed output + // to the readable side. You may call 'push' zero or more times. + // + // Call `cb(err)` when you are done with this chunk. If you pass + // an error, then that'll put the hurt on the whole operation. If you + // never call cb(), then you'll never get another chunk. + Transform.prototype._transform = function (chunk, encoding, cb) { + throw new Error('Not implemented'); + }; - Transform.call(this, options); - } + Transform.prototype._write = function (chunk, encoding, cb) { + var ts = this._transformState; + ts.writecb = cb; + ts.writechunk = chunk; + ts.writeencoding = encoding; + if (!ts.transforming) { + var rs = this._readableState; + if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark); + } + }; - PassThrough.prototype._transform = function (chunk, encoding, cb) { - cb(null, chunk); - }; + // Doesn't matter what the args are here. + // _transform does all the work. + // That we got here means that the readable side wants more data. + Transform.prototype._read = function (n) { + var ts = this._transformState; - inherits$1(Stream, EventEmitter); - Stream.Readable = Readable; - Stream.Writable = Writable; - Stream.Duplex = Duplex; - Stream.Transform = Transform; - Stream.PassThrough = PassThrough; + if (ts.writechunk !== null && ts.writecb && !ts.transforming) { + ts.transforming = true; + this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform); + } else { + // mark that we need a transform, so that any data that comes in + // will get processed, now that we've asked for it. + ts.needTransform = true; + } + }; - // Backwards-compat with node 0.4.x - Stream.Stream = Stream; + function done(stream, er) { + if (er) return stream.emit('error', er); - // old-style streams. Note that the pipe method (the only relevant - // part of this class) is overridden in the Readable class. + // if there's nothing in the write buffer, then that means + // that nothing more will ever be provided + var ws = stream._writableState; + var ts = stream._transformState; - function Stream() { - EventEmitter.call(this); - } + if (ws.length) throw new Error('Calling transform done when ws.length != 0'); - Stream.prototype.pipe = function(dest, options) { - var source = this; + if (ts.transforming) throw new Error('Calling transform done when still transforming'); - function ondata(chunk) { - if (dest.writable) { - if (false === dest.write(chunk) && source.pause) { - source.pause(); - } + return stream.push(null); } - } - source.on('data', ondata); + inherits$1(PassThrough, Transform); + function PassThrough(options) { + if (!(this instanceof PassThrough)) return new PassThrough(options); - function ondrain() { - if (source.readable && source.resume) { - source.resume(); + Transform.call(this, options); } - }