1 /*
  2  * Copyright (C) 2013 Glyptodon LLC
  3  *
  4  * Permission is hereby granted, free of charge, to any person obtaining a copy
  5  * of this software and associated documentation files (the "Software"), to deal
  6  * in the Software without restriction, including without limitation the rights
  7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  8  * copies of the Software, and to permit persons to whom the Software is
  9  * furnished to do so, subject to the following conditions:
 10  *
 11  * The above copyright notice and this permission notice shall be included in
 12  * all copies or substantial portions of the Software.
 13  *
 14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 17  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 20  * THE SOFTWARE.
 21  */
 22 
 23 var Guacamole = Guacamole || {};
 24 
 25 /**
 26  * A writer which automatically writes to the given output stream with arbitrary
 27  * binary data, supplied as ArrayBuffers.
 28  * 
 29  * @constructor
 30  * @param {Guacamole.OutputStream} stream The stream that data will be written
 31  *                                        to.
 32  */
 33 Guacamole.ArrayBufferWriter = function(stream) {
 34 
 35     /**
 36      * Reference to this Guacamole.StringWriter.
 37      * @private
 38      */
 39     var guac_writer = this;
 40 
 41     // Simply call onack for acknowledgements
 42     stream.onack = function(status) {
 43         if (guac_writer.onack)
 44             guac_writer.onack(status);
 45     };
 46 
 47     /**
 48      * Encodes the given data as base64, sending it as a blob. The data must
 49      * be small enough to fit into a single blob instruction.
 50      * 
 51      * @private
 52      * @param {Uint8Array} bytes The data to send.
 53      */
 54     function __send_blob(bytes) {
 55 
 56         var binary = "";
 57 
 58         // Produce binary string from bytes in buffer
 59         for (var i=0; i<bytes.byteLength; i++)
 60             binary += String.fromCharCode(bytes[i]);
 61 
 62         // Send as base64
 63         stream.sendBlob(window.btoa(binary));
 64 
 65     }
 66 
 67     /**
 68      * Sends the given data.
 69      * 
 70      * @param {ArrayBuffer|TypedArray} data The data to send.
 71      */
 72     this.sendData = function(data) {
 73 
 74         var bytes = new Uint8Array(data);
 75 
 76         // If small enough to fit into single instruction, send as-is
 77         if (bytes.length <= 8064)
 78             __send_blob(bytes);
 79 
 80         // Otherwise, send as multiple instructions
 81         else {
 82             for (var offset=0; offset<bytes.length; offset += 8064)
 83                 __send_blob(bytes.subarray(offset, offset + 8094));
 84         }
 85 
 86     };
 87 
 88     /**
 89      * Signals that no further text will be sent, effectively closing the
 90      * stream.
 91      */
 92     this.sendEnd = function() {
 93         stream.sendEnd();
 94     };
 95 
 96     /**
 97      * Fired for received data, if acknowledged by the server.
 98      * @event
 99      * @param {Guacamole.Status} status The status of the operation.
100      */
101     this.onack = null;
102 
103 };