{"ast":null,"code":"'use strict';\n\nconst zlib = require('zlib');\nconst bufferUtil = require('./buffer-util');\nconst Limiter = require('./limiter');\nconst {\n  kStatusCode\n} = require('./constants');\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 = this._options.threshold !== undefined ? this._options.threshold : 1024;\n    this._isServer = !!isServer;\n    this._deflate = null;\n    this._inflate = null;\n    this.params = null;\n    if (!zlibLimiter) {\n      const concurrency = this._options.concurrencyLimit !== undefined ? this._options.concurrencyLimit : 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    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    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    this.params = this._isServer ? this.acceptAsServer(configurations) : this.acceptAsClient(configurations);\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    if (this._deflate) {\n      const callback = this._deflate[kCallback];\n      this._deflate.close();\n      this._deflate = null;\n      if (callback) {\n        callback(new Error('The deflate stream was closed while data was being processed'));\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 (opts.serverNoContextTakeover === false && params.server_no_context_takeover || params.server_max_window_bits && (opts.serverMaxWindowBits === false || typeof opts.serverMaxWindowBits === 'number' && opts.serverMaxWindowBits > params.server_max_window_bits) || typeof opts.clientMaxWindowBits === 'number' && !params.client_max_window_bits) {\n        return false;\n      }\n      return true;\n    });\n    if (!accepted) {\n      throw new Error('None of the extension offers can be accepted');\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 (accepted.client_max_window_bits === true || opts.clientMaxWindowBits === false) {\n      delete accepted.client_max_window_bits;\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    if (this._options.clientNoContextTakeover === false && params.client_no_context_takeover) {\n      throw new Error('Unexpected parameter \"client_no_context_takeover\"');\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 (this._options.clientMaxWindowBits === false || typeof this._options.clientMaxWindowBits === 'number' && params.client_max_window_bits > this._options.clientMaxWindowBits) {\n      throw new Error('Unexpected or invalid parameter \"client_max_window_bits\"');\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        if (value.length > 1) {\n          throw new Error(`Parameter \"${key}\" must have only a single value`);\n        }\n        value = value[0];\n        if (key === 'client_max_window_bits') {\n          if (value !== true) {\n            const num = +value;\n            if (!Number.isInteger(num) || num < 8 || num > 15) {\n              throw new TypeError(`Invalid value for parameter \"${key}\": ${value}`);\n            }\n            value = num;\n          } else if (!this._isServer) {\n            throw new TypeError(`Invalid value for parameter \"${key}\": ${value}`);\n          }\n        } else if (key === 'server_max_window_bits') {\n          const num = +value;\n          if (!Number.isInteger(num) || num < 8 || num > 15) {\n            throw new TypeError(`Invalid value for parameter \"${key}\": ${value}`);\n          }\n          value = num;\n        } else if (key === 'client_no_context_takeover' || key === 'server_no_context_takeover') {\n          if (value !== true) {\n            throw new TypeError(`Invalid value for parameter \"${key}\": ${value}`);\n          }\n        } else {\n          throw new Error(`Unknown parameter \"${key}\"`);\n        }\n        params[key] = value;\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    if (!this._inflate) {\n      const key = `${endpoint}_max_window_bits`;\n      const windowBits = typeof this.params[key] !== 'number' ? zlib.Z_DEFAULT_WINDOWBITS : this.params[key];\n      this._inflate = zlib.createInflateRaw({\n        ...this._options.zlibInflateOptions,\n        windowBits\n      });\n      this._inflate[kPerMessageDeflate] = this;\n      this._inflate[kTotalLength] = 0;\n      this._inflate[kBuffers] = [];\n      this._inflate.on('error', inflateOnError);\n      this._inflate.on('data', inflateOnData);\n    }\n    this._inflate[kCallback] = callback;\n    this._inflate.write(data);\n    if (fin) this._inflate.write(TRAILER);\n    this._inflate.flush(() => {\n      const err = this._inflate[kError];\n      if (err) {\n        this._inflate.close();\n        this._inflate = null;\n        callback(err);\n        return;\n      }\n      const data = bufferUtil.concat(this._inflate[kBuffers], this._inflate[kTotalLength]);\n      if (this._inflate._readableState.endEmitted) {\n        this._inflate.close();\n        this._inflate = null;\n      } else {\n        this._inflate[kTotalLength] = 0;\n        this._inflate[kBuffers] = [];\n        if (fin && this.params[`${endpoint}_no_context_takeover`]) {\n          this._inflate.reset();\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    if (!this._deflate) {\n      const key = `${endpoint}_max_window_bits`;\n      const windowBits = typeof this.params[key] !== 'number' ? zlib.Z_DEFAULT_WINDOWBITS : this.params[key];\n      this._deflate = zlib.createDeflateRaw({\n        ...this._options.zlibDeflateOptions,\n        windowBits\n      });\n      this._deflate[kTotalLength] = 0;\n      this._deflate[kBuffers] = [];\n      this._deflate.on('data', deflateOnData);\n    }\n    this._deflate[kCallback] = callback;\n    this._deflate.write(data);\n    this._deflate.flush(zlib.Z_SYNC_FLUSH, () => {\n      if (!this._deflate) {\n        //\n        // The deflate stream was closed while data was being processed.\n        //\n        return;\n      }\n      let data = bufferUtil.concat(this._deflate[kBuffers], this._deflate[kTotalLength]);\n      if (fin) {\n        data = new FastBuffer(data.buffer, data.byteOffset, data.length - 4);\n      }\n\n      //\n      // Ensure that the callback will not be called again in\n      // `PerMessageDeflate#cleanup()`.\n      //\n      this._deflate[kCallback] = null;\n      this._deflate[kTotalLength] = 0;\n      this._deflate[kBuffers] = [];\n      if (fin && this.params[`${endpoint}_no_context_takeover`]) {\n        this._deflate.reset();\n      }\n      callback(null, data);\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  if (this[kPerMessageDeflate]._maxPayload < 1 || this[kTotalLength] <= this[kPerMessageDeflate]._maxPayload) {\n    this[kBuffers].push(chunk);\n    return;\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  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  err[kStatusCode] = 1007;\n  this[kCallback](err);\n}","map":{"version":3,"names":["zlib","require","bufferUtil","Limiter","kStatusCode","FastBuffer","Buffer","Symbol","species","TRAILER","from","kPerMessageDeflate","kTotalLength","kCallback","kBuffers","kError","zlibLimiter","PerMessageDeflate","constructor","options","isServer","maxPayload","_maxPayload","_options","_threshold","threshold","undefined","_isServer","_deflate","_inflate","params","concurrency","concurrencyLimit","extensionName","offer","serverNoContextTakeover","server_no_context_takeover","clientNoContextTakeover","client_no_context_takeover","serverMaxWindowBits","server_max_window_bits","clientMaxWindowBits","client_max_window_bits","accept","configurations","normalizeParams","acceptAsServer","acceptAsClient","cleanup","close","callback","Error","offers","opts","accepted","find","response","forEach","Object","keys","key","value","length","num","Number","isInteger","TypeError","decompress","data","fin","add","done","_decompress","err","result","compress","_compress","endpoint","windowBits","Z_DEFAULT_WINDOWBITS","createInflateRaw","zlibInflateOptions","on","inflateOnError","inflateOnData","write","flush","concat","_readableState","endEmitted","reset","createDeflateRaw","zlibDeflateOptions","deflateOnData","Z_SYNC_FLUSH","buffer","byteOffset","module","exports","chunk","push","RangeError","code","removeListener"],"sources":["/Users/shoofle/Projects/the-forest/node_modules/@libsql/isomorphic-ws/node_modules/ws/lib/permessage-deflate.js"],"sourcesContent":["'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 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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  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  err[kStatusCode] = 1007;\n  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