Source: main/webapp/modules/ArrayBufferReader.js

  1. /*
  2.  * Licensed to the Apache Software Foundation (ASF) under one
  3.  * or more contributor license agreements.  See the NOTICE file
  4.  * distributed with this work for additional information
  5.  * regarding copyright ownership.  The ASF licenses this file
  6.  * to you under the Apache License, Version 2.0 (the
  7.  * "License"); you may not use this file except in compliance
  8.  * with the License.  You may obtain a copy of the License at
  9.  *
  10.  *   http://www.apache.org/licenses/LICENSE-2.0
  11.  *
  12.  * Unless required by applicable law or agreed to in writing,
  13.  * software distributed under the License is distributed on an
  14.  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  15.  * KIND, either express or implied.  See the License for the
  16.  * specific language governing permissions and limitations
  17.  * under the License.
  18.  */
  20. var Guacamole = Guacamole || {};
  22. /**
  23.  * A reader which automatically handles the given input stream, returning
  24.  * strictly received packets as array buffers. Note that this object will
  25.  * overwrite any installed event handlers on the given Guacamole.InputStream.
  26.  * 
  27.  * @constructor
  28.  * @param {!Guacamole.InputStream} stream
  29.  *     The stream that data will be read from.
  30.  */
  31. Guacamole.ArrayBufferReader = function(stream) {
  33.     /**
  34.      * Reference to this Guacamole.InputStream.
  35.      * @private
  36.      */
  37.     var guac_reader = this;
  39.     // Receive blobs as array buffers
  40.     stream.onblob = function(data) {
  42.         // Convert to ArrayBuffer
  43.         var binary = window.atob(data);
  44.         var arrayBuffer = new ArrayBuffer(binary.length);
  45.         var bufferView = new Uint8Array(arrayBuffer);
  47.         for (var i=0; i<binary.length; i++)
  48.             bufferView[i] = binary.charCodeAt(i);
  50.         // Call handler, if present
  51.         if (guac_reader.ondata)
  52.             guac_reader.ondata(arrayBuffer);
  54.     };
  56.     // Simply call onend when end received
  57.     stream.onend = function() {
  58.         if (guac_reader.onend)
  59.             guac_reader.onend();
  60.     };
  62.     /**
  63.      * Fired once for every blob of data received.
  64.      * 
  65.      * @event
  66.      * @param {!ArrayBuffer} buffer
  67.      *     The data packet received.
  68.      */
  69.     this.ondata = null;
  71.     /**
  72.      * Fired once this stream is finished and no further data will be written.
  73.      * @event
  74.      */
  75.     this.onend = null;
  77. };