fixparser-plugin-messagestore-kdb/build/esm/MessageStoreKDB.mjs.map

FIXParser KDB+ plugin

{
  "version": 3,
  "sources": ["../../../../node_modules/ws/lib/constants.js", "../../../../node_modules/ws/lib/buffer-util.js", "../../../../node_modules/ws/lib/limiter.js", "../../../../node_modules/ws/lib/permessage-deflate.js", "../../../../node_modules/ws/lib/validation.js", "../../../../node_modules/ws/lib/receiver.js", "../../../../node_modules/ws/lib/sender.js", "../../../../node_modules/ws/lib/event-target.js", "../../../../node_modules/ws/lib/extension.js", "../../../../node_modules/ws/lib/websocket.js", "../../../../node_modules/ws/lib/stream.js", "../../../../node_modules/ws/lib/subprotocol.js", "../../../../node_modules/ws/lib/websocket-server.js", "../../../fixparser-common/src/MessageBuffer.ts", "../../../fixparser-common/src/uuidv4.ts", "../../../../node_modules/ws/wrapper.mjs", "../../src/c.js", "../../src/MessageStoreKDB.ts"],
  "sourcesContent": ["'use strict';\n\nconst BINARY_TYPES = ['nodebuffer', 'arraybuffer', 'fragments'];\nconst hasBlob = typeof Blob !== 'undefined';\n\nif (hasBlob) BINARY_TYPES.push('blob');\n\nmodule.exports = {\n  BINARY_TYPES,\n  EMPTY_BUFFER: Buffer.alloc(0),\n  GUID: '258EAFA5-E914-47DA-95CA-C5AB0DC85B11',\n  hasBlob,\n  kForOnEventAttribute: Symbol('kIsForOnEventAttribute'),\n  kListener: Symbol('kListener'),\n  kStatusCode: Symbol('status-code'),\n  kWebSocket: Symbol('websocket'),\n  NOOP: () => {}\n};\n", "'use strict';\n\nconst { EMPTY_BUFFER } = require('./constants');\n\nconst FastBuffer = Buffer[Symbol.species];\n\n/**\n * Merges an array of buffers into a new buffer.\n *\n * @param {Buffer[]} list The array of buffers to concat\n * @param {Number} totalLength The total length of buffers in the list\n * @return {Buffer} The resulting buffer\n * @public\n */\nfunction concat(list, totalLength) {\n  if (list.length === 0) return EMPTY_BUFFER;\n  if (list.length === 1) return list[0];\n\n  const target = Buffer.allocUnsafe(totalLength);\n  let offset = 0;\n\n  for (let i = 0; i < list.length; i++) {\n    const buf = list[i];\n    target.set(buf, offset);\n    offset += buf.length;\n  }\n\n  if (offset < totalLength) {\n    return new FastBuffer(target.buffer, target.byteOffset, offset);\n  }\n\n  return target;\n}\n\n/**\n * Masks a buffer using the given mask.\n *\n * @param {Buffer} source The buffer to mask\n * @param {Buffer} mask The mask to use\n * @param {Buffer} output The buffer where to store the result\n * @param {Number} offset The offset at which to start writing\n * @param {Number} length The number of bytes to mask.\n * @public\n */\nfunction _mask(source, mask, output, offset, length) {\n  for (let i = 0; i < length; i++) {\n    output[offset + i] = source[i] ^ mask[i & 3];\n  }\n}\n\n/**\n * Unmasks a buffer using the given mask.\n *\n * @param {Buffer} buffer The buffer to unmask\n * @param {Buffer} mask The mask to use\n * @public\n */\nfunction _unmask(buffer, mask) {\n  for (let i = 0; i < buffer.length; i++) {\n    buffer[i] ^= mask[i & 3];\n  }\n}\n\n/**\n * Converts a buffer to an `ArrayBuffer`.\n *\n * @param {Buffer} buf The buffer to convert\n * @return {ArrayBuffer} Converted buffer\n * @public\n */\nfunction toArrayBuffer(buf) {\n  if (buf.length === buf.buffer.byteLength) {\n    return buf.buffer;\n  }\n\n  return buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.length);\n}\n\n/**\n * Converts `data` to a `Buffer`.\n *\n * @param {*} data The data to convert\n * @return {Buffer} The buffer\n * @throws {TypeError}\n * @public\n */\nfunction toBuffer(data) {\n  toBuffer.readOnly = true;\n\n  if (Buffer.isBuffer(data)) return data;\n\n  let buf;\n\n  if (data instanceof ArrayBuffer) {\n    buf = new FastBuffer(data);\n  } else if (ArrayBuffer.isView(data)) {\n    buf = new FastBuffer(data.buffer, data.byteOffset, data.byteLength);\n  } else {\n    buf = Buffer.from(data);\n    toBuffer.readOnly = false;\n  }\n\n  return buf;\n}\n\nmodule.exports = {\n  concat,\n  mask: _mask,\n  toArrayBuffer,\n  toBuffer,\n  unmask: _unmask\n};\n\n/* istanbul ignore else  */\nif (!process.env.WS_NO_BUFFER_UTIL) {\n  try {\n    const bufferUtil = require('bufferutil');\n\n    module.exports.mask = function (source, mask, output, offset, length) {\n      if (length < 48) _mask(source, mask, output, offset, length);\n      else bufferUtil.mask(source, mask, output, offset, length);\n    };\n\n    module.exports.unmask = function (buffer, mask) {\n      if (buffer.length < 32) _unmask(buffer, mask);\n      else bufferUtil.unmask(buffer, mask);\n    };\n  } catch (e) {\n    // Continue regardless of the error.\n  }\n}\n", "'use strict';\n\nconst kDone = Symbol('kDone');\nconst kRun = Symbol('kRun');\n\n/**\n * A very simple job queue with adjustable concurrency. Adapted from\n * https://github.com/STRML/async-limiter\n */\nclass Limiter {\n  /**\n   * Creates a new `Limiter`.\n   *\n   * @param {Number} [concurrency=Infinity] The maximum number of jobs allowed\n   *     to run concurrently\n   */\n  constructor(concurrency) {\n    this[kDone] = () => {\n      this.pending--;\n      this[kRun]();\n    };\n    this.concurrency = concurrency || Infinity;\n    this.jobs = [];\n    this.pending = 0;\n  }\n\n  /**\n   * Adds a job to the queue.\n   *\n   * @param {Function} job The job to run\n   * @public\n   */\n  add(job) {\n    this.jobs.push(job);\n    this[kRun]();\n  }\n\n  /**\n   * Removes a job from the queue and runs it if possible.\n   *\n   * @private\n   */\n  [kRun]() {\n    if (this.pending === this.concurrency) return;\n\n    if (this.jobs.length) {\n      const job = this.jobs.shift();\n\n      this.pending++;\n      job(this[kDone]);\n    }\n  }\n}\n\nmodule.exports = Limiter;\n", "'use strict';\n\nconst zlib = require('zlib');\n\nconst bufferUtil = require('./buffer-util');\nconst Limiter = require('./limiter');\nconst { kStatusCode } = require('./constants');\n\nconst FastBuffer = Buffer[Symbol.species];\nconst TRAILER = Buffer.from([0x00, 0x00, 0xff, 0xff]);\nconst kPerMessageDeflate = Symbol('permessage-deflate');\nconst kTotalLength = Symbol('total-length');\nconst kCallback = Symbol('callback');\nconst kBuffers = Symbol('buffers');\nconst kError = Symbol('error');\n\n//\n// We limit zlib concurrency, which prevents severe memory fragmentation\n// as documented in https://github.com/nodejs/node/issues/8871#issuecomment-250915913\n// and https://github.com/websockets/ws/issues/1202\n//\n// Intentionally global; it's the global thread pool that's an issue.\n//\nlet zlibLimiter;\n\n/**\n * permessage-deflate implementation.\n */\nclass PerMessageDeflate {\n  /**\n   * Creates a PerMessageDeflate instance.\n   *\n   * @param {Object} [options] Configuration options\n   * @param {(Boolean|Number)} [options.clientMaxWindowBits] Advertise support\n   *     for, or request, a custom client window size\n   * @param {Boolean} [options.clientNoContextTakeover=false] Advertise/\n   *     acknowledge disabling of client context takeover\n   * @param {Number} [options.concurrencyLimit=10] The number of concurrent\n   *     calls to zlib\n   * @param {(Boolean|Number)} [options.serverMaxWindowBits] Request/confirm the\n   *     use of a custom server window size\n   * @param {Boolean} [options.serverNoContextTakeover=false] Request/accept\n   *     disabling of server context takeover\n   * @param {Number} [options.threshold=1024] Size (in bytes) below which\n   *     messages should not be compressed if context takeover is disabled\n   * @param {Object} [options.zlibDeflateOptions] Options to pass to zlib on\n   *     deflate\n   * @param {Object} [options.zlibInflateOptions] Options to pass to zlib on\n   *     inflate\n   * @param {Boolean} [isServer=false] Create the instance in either server or\n   *     client mode\n   * @param {Number} [maxPayload=0] The maximum allowed message length\n   */\n  constructor(options, isServer, maxPayload) {\n    this._maxPayload = maxPayload | 0;\n    this._options = options || {};\n    this._threshold =\n      this._options.threshold !== undefined ? this._options.threshold : 1024;\n    this._isServer = !!isServer;\n    this._deflate = null;\n    this._inflate = null;\n\n    this.params = null;\n\n    if (!zlibLimiter) {\n      const concurrency =\n        this._options.concurrencyLimit !== undefined\n          ? this._options.concurrencyLimit\n          : 10;\n      zlibLimiter = new Limiter(concurrency);\n    }\n  }\n\n  /**\n   * @type {String}\n   */\n  static get extensionName() {\n    return 'permessage-deflate';\n  }\n\n  /**\n   * Create an extension negotiation offer.\n   *\n   * @return {Object} Extension parameters\n   * @public\n   */\n  offer() {\n    const params = {};\n\n    if (this._options.serverNoContextTakeover) {\n      params.server_no_context_takeover = true;\n    }\n    if (this._options.clientNoContextTakeover) {\n      params.client_no_context_takeover = true;\n    }\n    if (this._options.serverMaxWindowBits) {\n      params.server_max_window_bits = this._options.serverMaxWindowBits;\n    }\n    if (this._options.clientMaxWindowBits) {\n      params.client_max_window_bits = this._options.clientMaxWindowBits;\n    } else if (this._options.clientMaxWindowBits == null) {\n      params.client_max_window_bits = true;\n    }\n\n    return params;\n  }\n\n  /**\n   * Accept an extension negotiation offer/response.\n   *\n   * @param {Array} configurations The extension negotiation offers/reponse\n   * @return {Object} Accepted configuration\n   * @public\n   */\n  accept(configurations) {\n    configurations = this.normalizeParams(configurations);\n\n    this.params = this._isServer\n      ? this.acceptAsServer(configurations)\n      : this.acceptAsClient(configurations);\n\n    return this.params;\n  }\n\n  /**\n   * Releases all resources used by the extension.\n   *\n   * @public\n   */\n  cleanup() {\n    if (this._inflate) {\n      this._inflate.close();\n      this._inflate = null;\n    }\n\n    if (this._deflate) {\n      const callback = this._deflate[kCallback];\n\n      this._deflate.close();\n      this._deflate = null;\n\n      if (callback) {\n        callback(\n          new Error(\n            'The deflate stream was closed while data was being processed'\n          )\n        );\n      }\n    }\n  }\n\n  /**\n   *  Accept an extension negotiation offer.\n   *\n   * @param {Array} offers The extension negotiation offers\n   * @return {Object} Accepted configuration\n   * @private\n   */\n  acceptAsServer(offers) {\n    const opts = this._options;\n    const accepted = offers.find((params) => {\n      if (\n        (opts.serverNoContextTakeover === false &&\n          params.server_no_context_takeover) ||\n        (params.server_max_window_bits &&\n          (opts.serverMaxWindowBits === false ||\n            (typeof opts.serverMaxWindowBits === 'number' &&\n              opts.serverMaxWindowBits > params.server_max_window_bits))) ||\n        (typeof opts.clientMaxWindowBits === 'number' &&\n          !params.client_max_window_bits)\n      ) {\n        return false;\n      }\n\n      return true;\n    });\n\n    if (!accepted) {\n      throw new Error('None of the extension offers can be accepted');\n    }\n\n    if (opts.serverNoContextTakeover) {\n      accepted.server_no_context_takeover = true;\n    }\n    if (opts.clientNoContextTakeover) {\n      accepted.client_no_context_takeover = true;\n    }\n    if (typeof opts.serverMaxWindowBits === 'number') {\n      accepted.server_max_window_bits = opts.serverMaxWindowBits;\n    }\n    if (typeof opts.clientMaxWindowBits === 'number') {\n      accepted.client_max_window_bits = opts.clientMaxWindowBits;\n    } else if (\n      accepted.client_max_window_bits === true ||\n      opts.clientMaxWindowBits === false\n    ) {\n      delete accepted.client_max_window_bits;\n    }\n\n    return accepted;\n  }\n\n  /**\n   * Accept the extension negotiation response.\n   *\n   * @param {Array} response The extension negotiation response\n   * @return {Object} Accepted configuration\n   * @private\n   */\n  acceptAsClient(response) {\n    const params = response[0];\n\n    if (\n      this._options.clientNoContextTakeover === false &&\n      params.client_no_context_takeover\n    ) {\n      throw new Error('Unexpected parameter \"client_no_context_takeover\"');\n    }\n\n    if (!params.client_max_window_bits) {\n      if (typeof this._options.clientMaxWindowBits === 'number') {\n        params.client_max_window_bits = this._options.clientMaxWindowBits;\n      }\n    } else if (\n      this._options.clientMaxWindowBits === false ||\n      (typeof this._options.clientMaxWindowBits === 'number' &&\n        params.client_max_window_bits > this._options.clientMaxWindowBits)\n    ) {\n      throw new Error(\n        'Unexpected or invalid parameter \"client_max_window_bits\"'\n      );\n    }\n\n    return params;\n  }\n\n  /**\n   * Normalize parameters.\n   *\n   * @param {Array} configurations The extension negotiation offers/reponse\n   * @return {Array} The offers/response with normalized parameters\n   * @private\n   */\n  normalizeParams(configurations) {\n    configurations.forEach((params) => {\n      Object.keys(params).forEach((key) => {\n        let value = params[key];\n\n        if (value.length > 1) {\n          throw new Error(`Parameter \"${key}\" must have only a single value`);\n        }\n\n        value = value[0];\n\n        if (key === 'client_max_window_bits') {\n          if (value !== true) {\n            const num = +value;\n            if (!Number.isInteger(num) || num < 8 || num > 15) {\n              throw new TypeError(\n                `Invalid value for parameter \"${key}\": ${value}`\n              );\n            }\n            value = num;\n          } else if (!this._isServer) {\n            throw new TypeError(\n              `Invalid value for parameter \"${key}\": ${value}`\n            );\n          }\n        } else if (key === 'server_max_window_bits') {\n          const num = +value;\n          if (!Number.isInteger(num) || num < 8 || num > 15) {\n            throw new TypeError(\n              `Invalid value for parameter \"${key}\": ${value}`\n            );\n          }\n          value = num;\n        } else if (\n          key === 'client_no_context_takeover' ||\n          key === 'server_no_context_takeover'\n        ) {\n          if (value !== true) {\n            throw new TypeError(\n              `Invalid value for parameter \"${key}\": ${value}`\n            );\n          }\n        } else {\n          throw new Error(`Unknown parameter \"${key}\"`);\n        }\n\n        params[key] = value;\n      });\n    });\n\n    return configurations;\n  }\n\n  /**\n   * Decompress data. Concurrency limited.\n   *\n   * @param {Buffer} data Compressed data\n   * @param {Boolean} fin Specifies whether or not this is the last fragment\n   * @param {Function} callback Callback\n   * @public\n   */\n  decompress(data, fin, callback) {\n    zlibLimiter.add((done) => {\n      this._decompress(data, fin, (err, result) => {\n        done();\n        callback(err, result);\n      });\n    });\n  }\n\n  /**\n   * Compress data. Concurrency limited.\n   *\n   * @param {(Buffer|String)} data Data to compress\n   * @param {Boolean} fin Specifies whether or not this is the last fragment\n   * @param {Function} callback Callback\n   * @public\n   */\n  compress(data, fin, callback) {\n    zlibLimiter.add((done) => {\n      this._compress(data, fin, (err, result) => {\n        done();\n        callback(err, result);\n      });\n    });\n  }\n\n  /**\n   * Decompress data.\n   *\n   * @param {Buffer} data Compressed data\n   * @param {Boolean} fin Specifies whether or not this is the last fragment\n   * @param {Function} callback Callback\n   * @private\n   */\n  _decompress(data, fin, callback) {\n    const endpoint = this._isServer ? 'client' : 'server';\n\n    if (!this._inflate) {\n      const key = `${endpoint}_max_window_bits`;\n      const windowBits =\n        typeof this.params[key] !== 'number'\n          ? zlib.Z_DEFAULT_WINDOWBITS\n          : this.params[key];\n\n      this._inflate = zlib.createInflateRaw({\n        ...this._options.zlibInflateOptions,\n        windowBits\n      });\n      this._inflate[kPerMessageDeflate] = this;\n      this._inflate[kTotalLength] = 0;\n      this._inflate[kBuffers] = [];\n      this._inflate.on('error', inflateOnError);\n      this._inflate.on('data', inflateOnData);\n    }\n\n    this._inflate[kCallback] = callback;\n\n    this._inflate.write(data);\n    if (fin) this._inflate.write(TRAILER);\n\n    this._inflate.flush(() => {\n      const err = this._inflate[kError];\n\n      if (err) {\n        this._inflate.close();\n        this._inflate = null;\n        callback(err);\n        return;\n      }\n\n      const data = bufferUtil.concat(\n        this._inflate[kBuffers],\n        this._inflate[kTotalLength]\n      );\n\n      if (this._inflate._readableState.endEmitted) {\n        this._inflate.close();\n        this._inflate = null;\n      } else {\n        this._inflate[kTotalLength] = 0;\n        this._inflate[kBuffers] = [];\n\n        if (fin && this.params[`${endpoint}_no_context_takeover`]) {\n          this._inflate.reset();\n        }\n      }\n\n      callback(null, data);\n    });\n  }\n\n  /**\n   * Compress data.\n   *\n   * @param {(Buffer|String)} data Data to compress\n   * @param {Boolean} fin Specifies whether or not this is the last fragment\n   * @param {Function} callback Callback\n   * @private\n   */\n  _compress(data, fin, callback) {\n    const endpoint = this._isServer ? 'server' : 'client';\n\n    if (!this._deflate) {\n      const key = `${endpoint}_max_window_bits`;\n      const windowBits =\n        typeof this.params[key] !== 'number'\n          ? zlib.Z_DEFAULT_WINDOWBITS\n          : this.params[key];\n\n      this._deflate = zlib.createDeflateRaw({\n        ...this._options.zlibDeflateOptions,\n        windowBits\n      });\n\n      this._deflate[kTotalLength] = 0;\n      this._deflate[kBuffers] = [];\n\n      this._deflate.on('data', deflateOnData);\n    }\n\n    this._deflate[kCallback] = callback;\n\n    this._deflate.write(data);\n    this._deflate.flush(zlib.Z_SYNC_FLUSH, () => {\n      if (!this._deflate) {\n        //\n        // The deflate stream was closed while data was being processed.\n        //\n        return;\n      }\n\n      let data = bufferUtil.concat(\n        this._deflate[kBuffers],\n        this._deflate[kTotalLength]\n      );\n\n      if (fin) {\n        data = new FastBuffer(data.buffer, data.byteOffset, data.length - 4);\n      }\n\n      //\n      // Ensure that the callback will not be called again in\n      // `PerMessageDeflate#cleanup()`.\n      //\n      this._deflate[kCallback] = null;\n\n      this._deflate[kTotalLength] = 0;\n      this._deflate[kBuffers] = [];\n\n      if (fin && this.params[`${endpoint}_no_context_takeover`]) {\n        this._deflate.reset();\n      }\n\n      callback(null, data);\n    });\n  }\n}\n\nmodule.exports = PerMessageDeflate;\n\n/**\n * The listener of the `zlib.DeflateRaw` stream `'data'` event.\n *\n * @param {Buffer} chunk A chunk of data\n * @private\n */\nfunction deflateOnData(chunk) {\n  this[kBuffers].push(chunk);\n  this[kTotalLength] += chunk.length;\n}\n\n/**\n * The listener of the `zlib.InflateRaw` stream `'data'` event.\n *\n * @param {Buffer} chunk A chunk of data\n * @private\n */\nfunction inflateOnData(chunk) {\n  this[kTotalLength] += chunk.length;\n\n  if (\n    this[kPerMessageDeflate]._maxPayload < 1 ||\n    this[kTotalLength] <= this[kPerMessageDeflate]._maxPayload\n  ) {\n    this[kBuffers].push(chunk);\n    return;\n  }\n\n  this[kError] = new RangeError('Max payload size exceeded');\n  this[kError].code = 'WS_ERR_UNSUPPORTED_MESSAGE_LENGTH';\n  this[kError][kStatusCode] = 1009;\n  this.removeListener('data', inflateOnData);\n\n  //\n  // The choice to employ `zlib.reset()` over `zlib.close()` is dictated by the\n  // fact that in Node.js versions prior to 13.10.0, the callback for\n  // `zlib.flush()` is not called if `zlib.close()` is used. Utilizing\n  // `zlib.reset()` ensures that either the callback is invoked or an error is\n  // emitted.\n  //\n  this.reset();\n}\n\n/**\n * The listener of the `zlib.InflateRaw` stream `'error'` event.\n *\n * @param {Error} err The emitted error\n * @private\n */\nfunction inflateOnError(err) {\n  //\n  // There is no need to call `Zlib#close()` as the handle is automatically\n  // closed when an error is emitted.\n  //\n  this[kPerMessageDeflate]._inflate = null;\n\n  if (this[kError]) {\n    this[kCallback](this[kError]);\n    return;\n  }\n\n  err[kStatusCode] = 1007;\n  this[kCallback](err);\n}\n", "'use strict';\n\nconst { isUtf8 } = require('buffer');\n\nconst { hasBlob } = require('./constants');\n\n//\n// Allowed token characters:\n//\n// '!', '#', '$', '%', '&', ''', '*', '+', '-',\n// '.', 0-9, A-Z, '^', '_', '`', a-z, '|', '~'\n//\n// tokenChars[32] === 0 // ' '\n// tokenChars[33] === 1 // '!'\n// tokenChars[34] === 0 // '\"'\n// ...\n//\n// prettier-ignore\nconst tokenChars = [\n  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0 - 15\n  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 16 - 31\n  0, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, // 32 - 47\n  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, // 48 - 63\n  0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 64 - 79\n  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, // 80 - 95\n  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 96 - 111\n  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0 // 112 - 127\n];\n\n/**\n * Checks if a status code is allowed in a close frame.\n *\n * @param {Number} code The status code\n * @return {Boolean} `true` if the status code is valid, else `false`\n * @public\n */\nfunction isValidStatusCode(code) {\n  return (\n    (code >= 1000 &&\n      code <= 1014 &&\n      code !== 1004 &&\n      code !== 1005 &&\n      code !== 1006) ||\n    (code >= 3000 && code <= 4999)\n  );\n}\n\n/**\n * Checks if a given buffer contains only correct UTF-8.\n * Ported from https://www.cl.cam.ac.uk/%7Emgk25/ucs/utf8_check.c by\n * Markus Kuhn.\n *\n * @param {Buffer} buf The buffer to check\n * @return {Boolean} `true` if `buf` contains only correct UTF-8, else `false`\n * @public\n */\nfunction _isValidUTF8(buf) {\n  const len = buf.length;\n  let i = 0;\n\n  while (i < len) {\n    if ((buf[i] & 0x80) === 0) {\n      // 0xxxxxxx\n      i++;\n    } else if ((buf[i] & 0xe0) === 0xc0) {\n      // 110xxxxx 10xxxxxx\n      if (\n        i + 1 === len ||\n        (buf[i + 1] & 0xc0) !== 0x80 ||\n        (buf[i] & 0xfe) === 0xc0 // Overlong\n      ) {\n        return false;\n      }\n\n      i += 2;\n    } else if ((buf[i] & 0xf0) === 0xe0) {\n      // 1110xxxx 10xxxxxx 10xxxxxx\n      if (\n        i + 2 >= len ||\n        (buf[i + 1] & 0xc0) !== 0x80 ||\n        (buf[i + 2] & 0xc0) !== 0x80 ||\n        (buf[i] === 0xe0 && (buf[i + 1] & 0xe0) === 0x80) || // Overlong\n        (buf[i] === 0xed && (buf[i + 1] & 0xe0) === 0xa0) // Surrogate (U+D800 - U+DFFF)\n      ) {\n        return false;\n      }\n\n      i += 3;\n    } else if ((buf[i] & 0xf8) === 0xf0) {\n      // 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx\n      if (\n        i + 3 >= len ||\n        (buf[i + 1] & 0xc0) !== 0x80 ||\n        (buf[i + 2] & 0xc0) !== 0x80 ||\n        (buf[i + 3] & 0xc0) !== 0x80 ||\n        (buf[i] === 0xf0 && (buf[i + 1] & 0xf0) === 0x80) || // Overlong\n        (buf[i] === 0xf4 && buf[i + 1] > 0x8f) ||\n        buf[i] > 0xf4 // > U+10FFFF\n      ) {\n        return false;\n      }\n\n      i += 4;\n    } else {\n      return false;\n    }\n  }\n\n  return true;\n}\n\n/**\n * Determines whether a value is a `Blob`.\n *\n * @param {*} value The value to be tested\n * @return {Boolean} `true` if `value` is a `Blob`, else `false`\n * @private\n */\nfunction isBlob(value) {\n  return (\n    hasBlob &&\n    typeof value === 'object' &&\n    typeof value.arrayBuffer === 'function' &&\n    typeof value.type === 'string' &&\n    typeof value.stream === 'function' &&\n    (value[Symbol.toStringTag] === 'Blob' ||\n      value[Symbol.toStringTag] === 'File')\n  );\n}\n\nmodule.exports = {\n  isBlob,\n  isValidStatusCode,\n  isValidUTF8: _isValidUTF8,\n  tokenChars\n};\n\nif (isUtf8) {\n  module.exports.isValidUTF8 = function (buf) {\n    return buf.length < 24 ? _isValidUTF8(buf) : isUtf8(buf);\n  };\n} /* istanbul ignore else  */ else if (!process.env.WS_NO_UTF_8_VALIDATE) {\n  try {\n    const isValidUTF8 = require('utf-8-validate');\n\n    module.exports.isValidUTF8 = function (buf) {\n      return buf.length < 32 ? _isValidUTF8(buf) : isValidUTF8(buf);\n    };\n  } catch (e) {\n    // Continue regardless of the error.\n  }\n}\n", "'use strict';\n\nconst { Writable } = require('stream');\n\nconst PerMessageDeflate = require('./permessage-deflate');\nconst {\n  BINARY_TYPES,\n  EMPTY_BUFFER,\n  kStatusCode,\n  kWebSocket\n} = require('./constants');\nconst { concat, toArrayBuffer, unmask } = require('./buffer-util');\nconst { isValidStatusCode, isValidUTF8 } = require('./validation');\n\nconst FastBuffer = Buffer[Symbol.species];\n\nconst GET_INFO = 0;\nconst GET_PAYLOAD_LENGTH_16 = 1;\nconst GET_PAYLOAD_LENGTH_64 = 2;\nconst GET_MASK = 3;\nconst GET_DATA = 4;\nconst INFLATING = 5;\nconst DEFER_EVENT = 6;\n\n/**\n * HyBi Receiver implementation.\n *\n * @extends Writable\n */\nclass Receiver extends Writable {\n  /**\n   * Creates a Receiver instance.\n   *\n   * @param {Object} [options] Options object\n   * @param {Boolean} [options.allowSynchronousEvents=true] Specifies whether\n   *     any of the `'message'`, `'ping'`, and `'pong'` events can be emitted\n   *     multiple times in the same tick\n   * @param {String} [options.binaryType=nodebuffer] The type for binary data\n   * @param {Object} [options.extensions] An object containing the negotiated\n   *     extensions\n   * @param {Boolean} [options.isServer=false] Specifies whether to operate in\n   *     client or server mode\n   * @param {Number} [options.maxPayload=0] The maximum allowed message length\n   * @param {Boolean} [options.skipUTF8Validation=false] Specifies whether or\n   *     not to skip UTF-8 validation for text and close messages\n   */\n  constructor(options = {}) {\n    super();\n\n    this._allowSynchronousEvents =\n      options.allowSynchronousEvents !== undefined\n        ? options.allowSynchronousEvents\n        : true;\n    this._binaryType = options.binaryType || BINARY_TYPES[0];\n    this._extensions = options.extensions || {};\n    this._isServer = !!options.isServer;\n    this._maxPayload = options.maxPayload | 0;\n    this._skipUTF8Validation = !!options.skipUTF8Validation;\n    this[kWebSocket] = undefined;\n\n    this._bufferedBytes = 0;\n    this._buffers = [];\n\n    this._compressed = false;\n    this._payloadLength = 0;\n    this._mask = undefined;\n    this._fragmented = 0;\n    this._masked = false;\n    this._fin = false;\n    this._opcode = 0;\n\n    this._totalPayloadLength = 0;\n    this._messageLength = 0;\n    this._fragments = [];\n\n    this._errored = false;\n    this._loop = false;\n    this._state = GET_INFO;\n  }\n\n  /**\n   * Implements `Writable.prototype._write()`.\n   *\n   * @param {Buffer} chunk The chunk of data to write\n   * @param {String} encoding The character encoding of `chunk`\n   * @param {Function} cb Callback\n   * @private\n   */\n  _write(chunk, encoding, cb) {\n    if (this._opcode === 0x08 && this._state == GET_INFO) return cb();\n\n    this._bufferedBytes += chunk.length;\n    this._buffers.push(chunk);\n    this.startLoop(cb);\n  }\n\n  /**\n   * Consumes `n` bytes from the buffered data.\n   *\n   * @param {Number} n The number of bytes to consume\n   * @return {Buffer} The consumed bytes\n   * @private\n   */\n  consume(n) {\n    this._bufferedBytes -= n;\n\n    if (n === this._buffers[0].length) return this._buffers.shift();\n\n    if (n < this._buffers[0].length) {\n      const buf = this._buffers[0];\n      this._buffers[0] = new FastBuffer(\n        buf.buffer,\n        buf.byteOffset + n,\n        buf.length - n\n      );\n\n      return new FastBuffer(buf.buffer, buf.byteOffset, n);\n    }\n\n    const dst = Buffer.allocUnsafe(n);\n\n    do {\n      const buf = this._buffers[0];\n      const offset = dst.length - n;\n\n      if (n >= buf.length) {\n        dst.set(this._buffers.shift(), offset);\n      } else {\n        dst.set(new Uint8Array(buf.buffer, buf.byteOffset, n), offset);\n        this._buffers[0] = new FastBuffer(\n          buf.buffer,\n          buf.byteOffset + n,\n          buf.length - n\n        );\n      }\n\n      n -= buf.length;\n    } while (n > 0);\n\n    return dst;\n  }\n\n  /**\n   * Starts the parsing loop.\n   *\n   * @param {Function} cb Callback\n   * @private\n   */\n  startLoop(cb) {\n    this._loop = true;\n\n    do {\n      switch (this._state) {\n        case GET_INFO:\n          this.getInfo(cb);\n          break;\n        case GET_PAYLOAD_LENGTH_16:\n          this.getPayloadLength16(cb);\n          break;\n        case GET_PAYLOAD_LENGTH_64:\n          this.getPayloadLength64(cb);\n          break;\n        case GET_MASK:\n          this.getMask();\n          break;\n        case GET_DATA:\n          this.getData(cb);\n          break;\n        case INFLATING:\n        case DEFER_EVENT:\n          this._loop = false;\n          return;\n      }\n    } while (this._loop);\n\n    if (!this._errored) cb();\n  }\n\n  /**\n   * Reads the first two bytes of a frame.\n   *\n   * @param {Function} cb Callback\n   * @private\n   */\n  getInfo(cb) {\n    if (this._bufferedBytes < 2) {\n      this._loop = false;\n      return;\n    }\n\n    const buf = this.consume(2);\n\n    if ((buf[0] & 0x30) !== 0x00) {\n      const error = this.createError(\n        RangeError,\n        'RSV2 and RSV3 must be clear',\n        true,\n        1002,\n        'WS_ERR_UNEXPECTED_RSV_2_3'\n      );\n\n      cb(error);\n      return;\n    }\n\n    const compressed = (buf[0] & 0x40) === 0x40;\n\n    if (compressed && !this._extensions[PerMessageDeflate.extensionName]) {\n      const error = this.createError(\n        RangeError,\n        'RSV1 must be clear',\n        true,\n        1002,\n        'WS_ERR_UNEXPECTED_RSV_1'\n      );\n\n      cb(error);\n      return;\n    }\n\n    this._fin = (buf[0] & 0x80) === 0x80;\n    this._opcode = buf[0] & 0x0f;\n    this._payloadLength = buf[1] & 0x7f;\n\n    if (this._opcode === 0x00) {\n      if (compressed) {\n        const error = this.createError(\n          RangeError,\n          'RSV1 must be clear',\n          true,\n          1002,\n          'WS_ERR_UNEXPECTED_RSV_1'\n        );\n\n        cb(error);\n        return;\n      }\n\n      if (!this._fragmented) {\n        const error = this.createError(\n          RangeError,\n          'invalid opcode 0',\n          true,\n          1002,\n          'WS_ERR_INVALID_OPCODE'\n        );\n\n        cb(error);\n        return;\n      }\n\n      this._opcode = this._fragmented;\n    } else if (this._opcode === 0x01 || this._opcode === 0x02) {\n      if (this._fragmented) {\n        const error = this.createError(\n          RangeError,\n          `invalid opcode ${this._opcode}`,\n          true,\n          1002,\n          'WS_ERR_INVALID_OPCODE'\n        );\n\n        cb(error);\n        return;\n      }\n\n      this._compressed = compressed;\n    } else if (this._opcode > 0x07 && this._opcode < 0x0b) {\n      if (!this._fin) {\n        const error = this.createError(\n          RangeError,\n          'FIN must be set',\n          true,\n          1002,\n          'WS_ERR_EXPECTED_FIN'\n        );\n\n        cb(error);\n        return;\n      }\n\n      if (compressed) {\n        const error = this.createError(\n          RangeError,\n          'RSV1 must be clear',\n          true,\n          1002,\n          'WS_ERR_UNEXPECTED_RSV_1'\n        );\n\n        cb(error);\n        return;\n      }\n\n      if (\n        this._payloadLength > 0x7d ||\n        (this._opcode === 0x08 && this._payloadLength === 1)\n      ) {\n        const error = this.createError(\n          RangeError,\n          `invalid payload length ${this._payloadLength}`,\n          true,\n          1002,\n          'WS_ERR_INVALID_CONTROL_PAYLOAD_LENGTH'\n        );\n\n        cb(error);\n        return;\n      }\n    } else {\n      const error = this.createError(\n        RangeError,\n        `invalid opcode ${this._opcode}`,\n        true,\n        1002,\n        'WS_ERR_INVALID_OPCODE'\n      );\n\n      cb(error);\n      return;\n    }\n\n    if (!this._fin && !this._fragmented) this._fragmented = this._opcode;\n    this._masked = (buf[1] & 0x80) === 0x80;\n\n    if (this._isServer) {\n      if (!this._masked) {\n        const error = this.createError(\n          RangeError,\n          'MASK must be set',\n          true,\n          1002,\n          'WS_ERR_EXPECTED_MASK'\n        );\n\n        cb(error);\n        return;\n      }\n    } else if (this._masked) {\n      const error = this.createError(\n        RangeError,\n        'MASK must be clear',\n        true,\n        1002,\n        'WS_ERR_UNEXPECTED_MASK'\n      );\n\n      cb(error);\n      return;\n    }\n\n    if (this._payloadLength === 126) this._state = GET_PAYLOAD_LENGTH_16;\n    else if (this._payloadLength === 127) this._state = GET_PAYLOAD_LENGTH_64;\n    else this.haveLength(cb);\n  }\n\n  /**\n   * Gets extended payload length (7+16).\n   *\n   * @param {Function} cb Callback\n   * @private\n   */\n  getPayloadLength16(cb) {\n    if (this._bufferedBytes < 2) {\n      this._loop = false;\n      return;\n    }\n\n    this._payloadLength = this.consume(2).readUInt16BE(0);\n    this.haveLength(cb);\n  }\n\n  /**\n   * Gets extended payload length (7+64).\n   *\n   * @param {Function} cb Callback\n   * @private\n   */\n  getPayloadLength64(cb) {\n    if (this._bufferedBytes < 8) {\n      this._loop = false;\n      return;\n    }\n\n    const buf = this.consume(8);\n    const num = buf.readUInt32BE(0);\n\n    //\n    // The maximum safe integer in JavaScript is 2^53 - 1. An error is returned\n    // if payload length is greater than this number.\n    //\n    if (num > Math.pow(2, 53 - 32) - 1) {\n      const error = this.createError(\n        RangeError,\n        'Unsupported WebSocket frame: payload length > 2^53 - 1',\n        false,\n        1009,\n        'WS_ERR_UNSUPPORTED_DATA_PAYLOAD_LENGTH'\n      );\n\n      cb(error);\n      return;\n    }\n\n    this._payloadLength = num * Math.pow(2, 32) + buf.readUInt32BE(4);\n    this.haveLength(cb);\n  }\n\n  /**\n   * Payload length has been read.\n   *\n   * @param {Function} cb Callback\n   * @private\n   */\n  haveLength(cb) {\n    if (this._payloadLength && this._opcode < 0x08) {\n      this._totalPayloadLength += this._payloadLength;\n      if (this._totalPayloadLength > this._maxPayload && this._maxPayload > 0) {\n        const error = this.createError(\n          RangeError,\n          'Max payload size exceeded',\n          false,\n          1009,\n          'WS_ERR_UNSUPPORTED_MESSAGE_LENGTH'\n        );\n\n        cb(error);\n        return;\n      }\n    }\n\n    if (this._masked) this._state = GET_MASK;\n    else this._state = GET_DATA;\n  }\n\n  /**\n   * Reads mask bytes.\n   *\n   * @private\n   */\n  getMask() {\n    if (this._bufferedBytes < 4) {\n      this._loop = false;\n      return;\n    }\n\n    this._mask = this.consume(4);\n    this._state = GET_DATA;\n  }\n\n  /**\n   * Reads data bytes.\n   *\n   * @param {Function} cb Callback\n   * @private\n   */\n  getData(cb) {\n    let data = EMPTY_BUFFER;\n\n    if (this._payloadLength) {\n      if (this._bufferedBytes < this._payloadLength) {\n        this._loop = false;\n        return;\n      }\n\n      data = this.consume(this._payloadLength);\n\n      if (\n        this._masked &&\n        (this._mask[0] | this._mask[1] | this._mask[2] | this._mask[3]) !== 0\n      ) {\n        unmask(data, this._mask);\n      }\n    }\n\n    if (this._opcode > 0x07) {\n      this.controlMessage(data, cb);\n      return;\n    }\n\n    if (this._compressed) {\n      this._state = INFLATING;\n      this.decompress(data, cb);\n      return;\n    }\n\n    if (data.length) {\n      //\n      // This message is not compressed so its length is the sum of the payload\n      // length of all fragments.\n      //\n      this._messageLength = this._totalPayloadLength;\n      this._fragments.push(data);\n    }\n\n    this.dataMessage(cb);\n  }\n\n  /**\n   * Decompresses data.\n   *\n   * @param {Buffer} data Compressed data\n   * @param {Function} cb Callback\n   * @private\n   */\n  decompress(data, cb) {\n    const perMessageDeflate = this._extensions[PerMessageDeflate.extensionName];\n\n    perMessageDeflate.decompress(data, this._fin, (err, buf) => {\n      if (err) return cb(err);\n\n      if (buf.length) {\n        this._messageLength += buf.length;\n        if (this._messageLength > this._maxPayload && this._maxPayload > 0) {\n          const error = this.createError(\n            RangeError,\n            'Max payload size exceeded',\n            false,\n            1009,\n            'WS_ERR_UNSUPPORTED_MESSAGE_LENGTH'\n          );\n\n          cb(error);\n          return;\n        }\n\n        this._fragments.push(buf);\n      }\n\n      this.dataMessage(cb);\n      if (this._state === GET_INFO) this.startLoop(cb);\n    });\n  }\n\n  /**\n   * Handles a data message.\n   *\n   * @param {Function} cb Callback\n   * @private\n   */\n  dataMessage(cb) {\n    if (!this._fin) {\n      this._state = GET_INFO;\n      return;\n    }\n\n    const messageLength = this._messageLength;\n    const fragments = this._fragments;\n\n    this._totalPayloadLength = 0;\n    this._messageLength = 0;\n    this._fragmented = 0;\n    this._fragments = [];\n\n    if (this._opcode === 2) {\n      let data;\n\n      if (this._binaryType === 'nodebuffer') {\n        data = concat(fragments, messageLength);\n      } else if (this._binaryType === 'arraybuffer') {\n        data = toArrayBuffer(concat(fragments, messageLength));\n      } else if (this._binaryType === 'blob') {\n        data = new Blob(fragments);\n      } else {\n        data = fragments;\n      }\n\n      if (this._allowSynchronousEvents) {\n        this.emit('message', data, true);\n        this._state = GET_INFO;\n      } else {\n        this._state = DEFER_EVENT;\n        setImmediate(() => {\n          this.emit('message', data, true);\n          this._state = GET_INFO;\n          this.startLoop(cb);\n        });\n      }\n    } else {\n      const buf = concat(fragments, messageLength);\n\n      if (!this._skipUTF8Validation && !isValidUTF8(buf)) {\n        const error = this.createError(\n          Error,\n          'invalid UTF-8 sequence',\n          true,\n          1007,\n          'WS_ERR_INVALID_UTF8'\n        );\n\n        cb(error);\n        return;\n      }\n\n      if (this._state === INFLATING || this._allowSynchronousEvents) {\n        this.emit('message', buf, false);\n        this._state = GET_INFO;\n      } else {\n        this._state = DEFER_EVENT;\n        setImmediate(() => {\n          this.emit('message', buf, false);\n          this._state = GET_INFO;\n          this.startLoop(cb);\n        });\n      }\n    }\n  }\n\n  /**\n   * Handles a control message.\n   *\n   * @param {Buffer} data Data to handle\n   * @return {(Error|RangeError|undefined)} A possible error\n   * @private\n   */\n  controlMessage(data, cb) {\n    if (this._opcode === 0x08) {\n      if (data.length === 0) {\n        this._loop = false;\n        this.emit('conclude', 1005, EMPTY_BUFFER);\n        this.end();\n      } else {\n        const code = data.readUInt16BE(0);\n\n        if (!isValidStatusCode(code)) {\n          const error = this.createError(\n            RangeError,\n            `invalid status code ${code}`,\n            true,\n            1002,\n            'WS_ERR_INVALID_CLOSE_CODE'\n          );\n\n          cb(error);\n          return;\n        }\n\n        const buf = new FastBuffer(\n          data.buffer,\n          data.byteOffset + 2,\n          data.length - 2\n        );\n\n        if (!this._skipUTF8Validation && !isValidUTF8(buf)) {\n          const error = this.createError(\n            Error,\n            'invalid UTF-8 sequence',\n            true,\n            1007,\n            'WS_ERR_INVALID_UTF8'\n          );\n\n          cb(error);\n          return;\n        }\n\n        this._loop = false;\n        this.emit('conclude', code, buf);\n        this.end();\n      }\n\n      this._state = GET_INFO;\n      return;\n    }\n\n    if (this._allowSynchronousEvents) {\n      this.emit(this._opcode === 0x09 ? 'ping' : 'pong', data);\n      this._state = GET_INFO;\n    } else {\n      this._state = DEFER_EVENT;\n      setImmediate(() => {\n        this.emit(this._opcode === 0x09 ? 'ping' : 'pong', data);\n        this._state = GET_INFO;\n        this.startLoop(cb);\n      });\n    }\n  }\n\n  /**\n   * Builds an error object.\n   *\n   * @param {function(new:Error|RangeError)} ErrorCtor The error constructor\n   * @param {String} message The error message\n   * @param {Boolean} prefix Specifies whether or not to add a default prefix to\n   *     `message`\n   * @param {Number} statusCode The status code\n   * @param {String} errorCode The exposed error code\n   * @return {(Error|RangeError)} The error\n   * @private\n   */\n  createError(ErrorCtor, message, prefix, statusCode, errorCode) {\n    this._loop = false;\n    this._errored = true;\n\n    const err = new ErrorCtor(\n      prefix ? `Invalid WebSocket frame: ${message}` : message\n    );\n\n    Error.captureStackTrace(err, this.createError);\n    err.code = errorCode;\n    err[kStatusCode] = statusCode;\n    return err;\n  }\n}\n\nmodule.exports = Receiver;\n", "/* eslint no-unused-vars: [\"error\", { \"varsIgnorePattern\": \"^Duplex\" }] */\n\n'use strict';\n\nconst { Duplex } = require('stream');\nconst { randomFillSync } = require('crypto');\n\nconst PerMessageDeflate = require('./permessage-deflate');\nconst { EMPTY_BUFFER, kWebSocket, NOOP } = require('./constants');\nconst { isBlob, isValidStatusCode } = require('./validation');\nconst { mask: applyMask, toBuffer } = require('./buffer-util');\n\nconst kByteLength = Symbol('kByteLength');\nconst maskBuffer = Buffer.alloc(4);\nconst RANDOM_POOL_SIZE = 8 * 1024;\nlet randomPool;\nlet randomPoolPointer = RANDOM_POOL_SIZE;\n\nconst DEFAULT = 0;\nconst DEFLATING = 1;\nconst GET_BLOB_DATA = 2;\n\n/**\n * HyBi Sender implementation.\n */\nclass Sender {\n  /**\n   * Creates a Sender instance.\n   *\n   * @param {Duplex} socket The connection socket\n   * @param {Object} [extensions] An object containing the negotiated extensions\n   * @param {Function} [generateMask] The function used to generate the masking\n   *     key\n   */\n  constructor(socket, extensions, generateMask) {\n    this._extensions = extensions || {};\n\n    if (generateMask) {\n      this._generateMask = generateMask;\n      this._maskBuffer = Buffer.alloc(4);\n    }\n\n    this._socket = socket;\n\n    this._firstFragment = true;\n    this._compress = false;\n\n    this._bufferedBytes = 0;\n    this._queue = [];\n    this._state = DEFAULT;\n    this.onerror = NOOP;\n    this[kWebSocket] = undefined;\n  }\n\n  /**\n   * Frames a piece of data according to the HyBi WebSocket protocol.\n   *\n   * @param {(Buffer|String)} data The data to frame\n   * @param {Object} options Options object\n   * @param {Boolean} [options.fin=false] Specifies whether or not to set the\n   *     FIN bit\n   * @param {Function} [options.generateMask] The function used to generate the\n   *     masking key\n   * @param {Boolean} [options.mask=false] Specifies whether or not to mask\n   *     `data`\n   * @param {Buffer} [options.maskBuffer] The buffer used to store the masking\n   *     key\n   * @param {Number} options.opcode The opcode\n   * @param {Boolean} [options.readOnly=false] Specifies whether `data` can be\n   *     modified\n   * @param {Boolean} [options.rsv1=false] Specifies whether or not to set the\n   *     RSV1 bit\n   * @return {(Buffer|String)[]} The framed data\n   * @public\n   */\n  static frame(data, options) {\n    let mask;\n    let merge = false;\n    let offset = 2;\n    let skipMasking = false;\n\n    if (options.mask) {\n      mask = options.maskBuffer || maskBuffer;\n\n      if (options.generateMask) {\n        options.generateMask(mask);\n      } else {\n        if (randomPoolPointer === RANDOM_POOL_SIZE) {\n          /* istanbul ignore else  */\n          if (randomPool === undefined) {\n            //\n            // This is lazily initialized because server-sent frames must not\n            // be masked so it may never be used.\n            //\n            randomPool = Buffer.alloc(RANDOM_POOL_SIZE);\n          }\n\n          randomFillSync(randomPool, 0, RANDOM_POOL_SIZE);\n          randomPoolPointer = 0;\n        }\n\n        mask[0] = randomPool[randomPoolPointer++];\n        mask[1] = randomPool[randomPoolPointer++];\n        mask[2] = randomPool[randomPoolPointer++];\n        mask[3] = randomPool[randomPoolPointer++];\n      }\n\n      skipMasking = (mask[0] | mask[1] | mask[2] | mask[3]) === 0;\n      offset = 6;\n    }\n\n    let dataLength;\n\n    if (typeof data === 'string') {\n      if (\n        (!options.mask || skipMasking) &&\n        options[kByteLength] !== undefined\n      ) {\n        dataLength = options[kByteLength];\n      } else {\n        data = Buffer.from(data);\n        dataLength = data.length;\n      }\n    } else {\n      dataLength = data.length;\n      merge = options.mask && options.readOnly && !skipMasking;\n    }\n\n    let payloadLength = dataLength;\n\n    if (dataLength >= 65536) {\n      offset += 8;\n      payloadLength = 127;\n    } else if (dataLength > 125) {\n      offset += 2;\n      payloadLength = 126;\n    }\n\n    const target = Buffer.allocUnsafe(merge ? dataLength + offset : offset);\n\n    target[0] = options.fin ? options.opcode | 0x80 : options.opcode;\n    if (options.rsv1) target[0] |= 0x40;\n\n    target[1] = payloadLength;\n\n    if (payloadLength === 126) {\n      target.writeUInt16BE(dataLength, 2);\n    } else if (payloadLength === 127) {\n      target[2] = target[3] = 0;\n      target.writeUIntBE(dataLength, 4, 6);\n    }\n\n    if (!options.mask) return [target, data];\n\n    target[1] |= 0x80;\n    target[offset - 4] = mask[0];\n    target[offset - 3] = mask[1];\n    target[offset - 2] = mask[2];\n    target[offset - 1] = mask[3];\n\n    if (skipMasking) return [target, data];\n\n    if (merge) {\n      applyMask(data, mask, target, offset, dataLength);\n      return [target];\n    }\n\n    applyMask(data, mask, data, 0, dataLength);\n    return [target, data];\n  }\n\n  /**\n   * Sends a close message to the other peer.\n   *\n   * @param {Number} [code] The status code component of the body\n   * @param {(String|Buffer)} [data] The message component of the body\n   * @param {Boolean} [mask=false] Specifies whether or not to mask the message\n   * @param {Function} [cb] Callback\n   * @public\n   */\n  close(code, data, mask, cb) {\n    let buf;\n\n    if (code === undefined) {\n      buf = EMPTY_BUFFER;\n    } else if (typeof code !== 'number' || !isValidStatusCode(code)) {\n      throw new TypeError('First argument must be a valid error code number');\n    } else if (data === undefined || !data.length) {\n      buf = Buffer.allocUnsafe(2);\n      buf.writeUInt16BE(code, 0);\n    } else {\n      const length = Buffer.byteLength(data);\n\n      if (length > 123) {\n        throw new RangeError('The message must not be greater than 123 bytes');\n      }\n\n      buf = Buffer.allocUnsafe(2 + length);\n      buf.writeUInt16BE(code, 0);\n\n      if (typeof data === 'string') {\n        buf.write(data, 2);\n      } else {\n        buf.set(data, 2);\n      }\n    }\n\n    const options = {\n      [kByteLength]: buf.length,\n      fin: true,\n      generateMask: this._generateMask,\n      mask,\n      maskBuffer: this._maskBuffer,\n      opcode: 0x08,\n      readOnly: false,\n      rsv1: false\n    };\n\n    if (this._state !== DEFAULT) {\n      this.enqueue([this.dispatch, buf, false, options, cb]);\n    } else {\n      this.sendFrame(Sender.frame(buf, options), cb);\n    }\n  }\n\n  /**\n   * Sends a ping message to the other peer.\n   *\n   * @param {*} data The message to send\n   * @param {Boolean} [mask=false] Specifies whether or not to mask `data`\n   * @param {Function} [cb] Callback\n   * @public\n   */\n  ping(data, mask, cb) {\n    let byteLength;\n    let readOnly;\n\n    if (typeof data === 'string') {\n      byteLength = Buffer.byteLength(data);\n      readOnly = false;\n    } else if (isBlob(data)) {\n      byteLength = data.size;\n      readOnly = false;\n    } else {\n      data = toBuffer(data);\n      byteLength = data.length;\n      readOnly = toBuffer.readOnly;\n    }\n\n    if (byteLength > 125) {\n      throw new RangeError('The data size must not be greater than 125 bytes');\n    }\n\n    const options = {\n      [kByteLength]: byteLength,\n      fin: true,\n      generateMask: this._generateMask,\n      mask,\n      maskBuffer: this._maskBuffer,\n      opcode: 0x09,\n      readOnly,\n      rsv1: false\n    };\n\n    if (isBlob(data)) {\n      if (this._state !== DEFAULT) {\n        this.enqueue([this.getBlobData, data, false, options, cb]);\n      } else {\n        this.getBlobData(data, false, options, cb);\n      }\n    } else if (this._state !== DEFAULT) {\n      this.enqueue([this.dispatch, data, false, options, cb]);\n    } else {\n      this.sendFrame(Sender.frame(data, options), cb);\n    }\n  }\n\n  /**\n   * Sends a pong message to the other peer.\n   *\n   * @param {*} data The message to send\n   * @param {Boolean} [mask=false] Sp