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| <h1 class="page-title">Source: ArrayBufferWriter.js</h1> |
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| <pre class="prettyprint source linenums"><code>/* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| var Guacamole = Guacamole || {}; |
| |
| /** |
| * A writer which automatically writes to the given output stream with arbitrary |
| * binary data, supplied as ArrayBuffers. |
| * |
| * @constructor |
| * @param {Guacamole.OutputStream} stream The stream that data will be written |
| * to. |
| */ |
| Guacamole.ArrayBufferWriter = function(stream) { |
| |
| /** |
| * Reference to this Guacamole.StringWriter. |
| * @private |
| */ |
| var guac_writer = this; |
| |
| // Simply call onack for acknowledgements |
| stream.onack = function(status) { |
| if (guac_writer.onack) |
| guac_writer.onack(status); |
| }; |
| |
| /** |
| * Encodes the given data as base64, sending it as a blob. The data must |
| * be small enough to fit into a single blob instruction. |
| * |
| * @private |
| * @param {Uint8Array} bytes The data to send. |
| */ |
| function __send_blob(bytes) { |
| |
| var binary = ""; |
| |
| // Produce binary string from bytes in buffer |
| for (var i=0; i<bytes.byteLength; i++) |
| binary += String.fromCharCode(bytes[i]); |
| |
| // Send as base64 |
| stream.sendBlob(window.btoa(binary)); |
| |
| } |
| |
| /** |
| * The maximum length of any blob sent by this Guacamole.ArrayBufferWriter, |
| * in bytes. Data sent via |
| * [sendData()]{@link Guacamole.ArrayBufferWriter#sendData} which exceeds |
| * this length will be split into multiple blobs. As the Guacamole protocol |
| * limits the maximum size of any instruction or instruction element to |
| * 8192 bytes, and the contents of blobs will be base64-encoded, this value |
| * should only be increased with extreme caution. |
| * |
| * @type {Number} |
| * @default {@link Guacamole.ArrayBufferWriter.DEFAULT_BLOB_LENGTH} |
| */ |
| this.blobLength = Guacamole.ArrayBufferWriter.DEFAULT_BLOB_LENGTH; |
| |
| /** |
| * Sends the given data. |
| * |
| * @param {ArrayBuffer|TypedArray} data The data to send. |
| */ |
| this.sendData = function(data) { |
| |
| var bytes = new Uint8Array(data); |
| |
| // If small enough to fit into single instruction, send as-is |
| if (bytes.length <= guac_writer.blobLength) |
| __send_blob(bytes); |
| |
| // Otherwise, send as multiple instructions |
| else { |
| for (var offset=0; offset<bytes.length; offset += guac_writer.blobLength) |
| __send_blob(bytes.subarray(offset, offset + guac_writer.blobLength)); |
| } |
| |
| }; |
| |
| /** |
| * Signals that no further text will be sent, effectively closing the |
| * stream. |
| */ |
| this.sendEnd = function() { |
| stream.sendEnd(); |
| }; |
| |
| /** |
| * Fired for received data, if acknowledged by the server. |
| * @event |
| * @param {Guacamole.Status} status The status of the operation. |
| */ |
| this.onack = null; |
| |
| }; |
| |
| /** |
| * The default maximum blob length for new Guacamole.ArrayBufferWriter |
| * instances. |
| * |
| * @constant |
| * @type {Number} |
| */ |
| Guacamole.ArrayBufferWriter.DEFAULT_BLOB_LENGTH = 6048; |
| </code></pre> |
| </article> |
| </section> |
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