Migrate to cleaner InputStream and OutputStream with Reader wrappers.

guacamole-common-js/src/main/webapp/modules/BlobReader.js

@@ -0,0 +1,128 @@
+/*
+ * Copyright (C) 2013 Glyptodon LLC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+var Guacamole = Guacamole || {};
+
+/**
+ * A reader which automatically handles the given input stream, assembling all
+ * received blobs into a single blob by appending them to each other in order.
+ * Note that this object will overwrite any installed event handlers on the
+ * given Guacamole.InputStream.
+ * 
+ * @constructor
+ * @param {Guacamole.InputStream} stream The stream that data will be read
+ *                                       from.
+ * @param {String} mimetype The mimetype of the blob being built.
+ */
+Guacamole.BlobReader = function(stream, mimetype) {
+
+    /**
+     * Reference to this Guacamole.InputStream.
+     * @private
+     */
+    var guac_reader = this;
+
+    /**
+     * The length of this Guacamole.InputStream in bytes.
+     * @private
+     */
+    var length = 0;
+
+    // Get blob builder
+    var blob_builder;
+    if      (window.BlobBuilder)       blob_builder = new BlobBuilder();
+    else if (window.WebKitBlobBuilder) blob_builder = new WebKitBlobBuilder();
+    else if (window.MozBlobBuilder)    blob_builder = new MozBlobBuilder();
+    else
+        blob_builder = new (function() {
+
+            var blobs = [];
+
+            /** @ignore */
+            this.append = function(data) {
+                blobs.push(new Blob([data], {"type": mimetype}));
+            };
+
+            /** @ignore */
+            this.getBlob = function() {
+                return new Blob(blobs, {"type": mimetype});
+            };
+
+        })();
+
+    // Append received blobs
+    stream.onblob = function(data) {
+
+        // Convert to ArrayBuffer
+        var binary = window.atob(data);
+        var arrayBuffer = new ArrayBuffer(binary.length);
+        var bufferView = new Uint8Array(arrayBuffer);
+
+        for (var i=0; i<binary.length; i++)
+            bufferView[i] = binary.charCodeAt(i);
+
+        blob_builder.append(arrayBuffer);
+        length += arrayBuffer.byteLength;
+
+        // Call handler, if present
+        if (guac_reader.onprogress)
+            guac_reader.onprogress(arrayBuffer.byteLength);
+
+    };
+
+    // Simply call onend when end received
+    stream.onend = function() {
+        if (guac_reader.onend)
+            guac_reader.onend();
+    };
+
+    /**
+     * Returns the current length of this Guacamole.InputStream, in bytes.
+     * @return {Number} The current length of this Guacamole.InputStream.
+     */
+    this.getLength = function() {
+        return length;
+    };
+
+    /**
+     * Returns the contents of this Guacamole.BlobReader as a Blob.
+     * @return {Blob} The contents of this Guacamole.BlobReader.
+     */
+    this.getBlob = function() {
+        return blob_builder.getBlob();
+    };
+
+    /**
+     * Fired once for every blob of data received.
+     * 
+     * @event
+     * @param {Number} length The number of bytes received.
+     */
+    this.onprogress = null;
+
+    /**
+     * Fired once this stream is finished and no further data will be written.
+     * @event
+     */
+    this.onend = null;
+
+};