cloudfunctions/ClearingRedundantFolders/node_modules/ws/lib/receiver.js

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'use strict';

const { Writable } = require('stream');

const PerMessageDeflate = require('./permessage-deflate');
const {
  BINARY_TYPES,
  EMPTY_BUFFER,
  kStatusCode,
  kWebSocket
} = require('./constants');
const { concat, toArrayBuffer, unmask } = require('./buffer-util');
const { isValidStatusCode, isValidUTF8 } = require('./validation');

const GET_INFO = 0;
const GET_PAYLOAD_LENGTH_16 = 1;
const GET_PAYLOAD_LENGTH_64 = 2;
const GET_MASK = 3;
const GET_DATA = 4;
const INFLATING = 5;

/**
 * HyBi Receiver implementation.
 *
 * @extends Writable
 */
class Receiver extends Writable {
  /**
   * Creates a Receiver instance.
   *
   * @param {String} [binaryType=nodebuffer] The type for binary data
   * @param {Object} [extensions] An object containing the negotiated extensions
   * @param {Boolean} [isServer=false] Specifies whether to operate in client or
   *     server mode
   * @param {Number} [maxPayload=0] The maximum allowed message length
   */
  constructor(binaryType, extensions, isServer, maxPayload) {
    super();

    this._binaryType = binaryType || BINARY_TYPES[0];
    this[kWebSocket] = undefined;
    this._extensions = extensions || {};
    this._isServer = !!isServer;
    this._maxPayload = maxPayload | 0;

    this._bufferedBytes = 0;
    this._buffers = [];

    this._compressed = false;
    this._payloadLength = 0;
    this._mask = undefined;
    this._fragmented = 0;
    this._masked = false;
    this._fin = false;
    this._opcode = 0;

    this._totalPayloadLength = 0;
    this._messageLength = 0;
    this._fragments = [];