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 reader which automatically handles the given input stream, assembling all
 27  * received blobs into a single blob by appending them to each other in order.
 28  * Note that this object will overwrite any installed event handlers on the
 29  * given Guacamole.InputStream.
 30  * 
 31  * @constructor
 32  * @param {Guacamole.InputStream} stream The stream that data will be read
 33  *                                       from.
 34  * @param {String} mimetype The mimetype of the blob being built.
 35  */
 36 Guacamole.BlobReader = function(stream, mimetype) {
 37 
 38     /**
 39      * Reference to this Guacamole.InputStream.
 40      * @private
 41      */
 42     var guac_reader = this;
 43 
 44     /**
 45      * The length of this Guacamole.InputStream in bytes.
 46      * @private
 47      */
 48     var length = 0;
 49 
 50     // Get blob builder
 51     var blob_builder;
 52     if      (window.BlobBuilder)       blob_builder = new BlobBuilder();
 53     else if (window.WebKitBlobBuilder) blob_builder = new WebKitBlobBuilder();
 54     else if (window.MozBlobBuilder)    blob_builder = new MozBlobBuilder();
 55     else
 56         blob_builder = new (function() {
 57 
 58             var blobs = [];
 59 
 60             /** @ignore */
 61             this.append = function(data) {
 62                 blobs.push(new Blob([data], {"type": mimetype}));
 63             };
 64 
 65             /** @ignore */
 66             this.getBlob = function() {
 67                 return new Blob(blobs, {"type": mimetype});
 68             };
 69 
 70         })();
 71 
 72     // Append received blobs
 73     stream.onblob = function(data) {
 74 
 75         // Convert to ArrayBuffer
 76         var binary = window.atob(data);
 77         var arrayBuffer = new ArrayBuffer(binary.length);
 78         var bufferView = new Uint8Array(arrayBuffer);
 79 
 80         for (var i=0; i<binary.length; i++)
 81             bufferView[i] = binary.charCodeAt(i);
 82 
 83         blob_builder.append(arrayBuffer);
 84         length += arrayBuffer.byteLength;
 85 
 86         // Call handler, if present
 87         if (guac_reader.onprogress)
 88             guac_reader.onprogress(arrayBuffer.byteLength);
 89 
 90         // Send success response
 91         stream.sendAck("OK", 0x0000);
 92 
 93     };
 94 
 95     // Simply call onend when end received
 96     stream.onend = function() {
 97         if (guac_reader.onend)
 98             guac_reader.onend();
 99     };
100 
101     /**
102      * Returns the current length of this Guacamole.InputStream, in bytes.
103      * @return {Number} The current length of this Guacamole.InputStream.
104      */
105     this.getLength = function() {
106         return length;
107     };
108 
109     /**
110      * Returns the contents of this Guacamole.BlobReader as a Blob.
111      * @return {Blob} The contents of this Guacamole.BlobReader.
112      */
113     this.getBlob = function() {
114         return blob_builder.getBlob();
115     };
116 
117     /**
118      * Fired once for every blob of data received.
119      * 
120      * @event
121      * @param {Number} length The number of bytes received.
122      */
123     this.onprogress = null;
124 
125     /**
126      * Fired once this stream is finished and no further data will be written.
127      * @event
128      */
129     this.onend = null;
130 
131 };