browser/extensions/shumway/content/web/preview.js@6474c204b198
browser/extensions/shumway/content/web/preview.js
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
1 /* -*- Mode: js; js-indent-level: 2; indent-tabs-mode: nil; tab-width: 2 -*- */
2 /* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
3 /*
4 * Copyright 2013 Mozilla Foundation
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * 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, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
20 // Extenstion communication object
21 var FirefoxCom = (function FirefoxComClosure() {
22 return {
23 /**
24 * Creates an event that the extension is listening for and will
25 * synchronously respond to.
26 * NOTE: It is reccomended to use request() instead since one day we may not
27 * be able to synchronously reply.
28 * @param {String} action The action to trigger.
29 * @param {String} data Optional data to send.
30 * @return {*} The response.
31 */
32 requestSync: function(action, data) {
33 var request = document.createTextNode('');
34 document.documentElement.appendChild(request);
36 var sender = document.createEvent('CustomEvent');
37 sender.initCustomEvent('shumway.message', true, false,
38 {action: action, data: data, sync: true});
39 request.dispatchEvent(sender);
40 var response = sender.detail.response;
41 document.documentElement.removeChild(request);
42 return response;
43 },
44 /**
45 * Creates an event that the extension is listening for and will
46 * asynchronously respond by calling the callback.
47 * @param {String} action The action to trigger.
48 * @param {String} data Optional data to send.
49 * @param {Function} callback Optional response callback that will be called
50 * with one data argument.
51 */
52 request: function(action, data, callback) {
53 var request = document.createTextNode('');
54 request.setUserData('action', action, null);
55 request.setUserData('data', data, null);
56 request.setUserData('sync', false, null);
57 if (callback) {
58 request.setUserData('callback', callback, null);
60 document.addEventListener('shumway.response', function listener(event) {
61 var node = event.target,
62 response = event.detail.response;
64 document.documentElement.removeChild(node);
66 document.removeEventListener('shumway.response', listener, false);
67 return callback(response);
68 }, false);
69 }
70 document.documentElement.appendChild(request);
72 var sender = document.createEvent('CustomEvent');
73 sender.initCustomEvent('shumway.message', true, false,
74 {action: action, data: data, sync: false});
75 return request.dispatchEvent(sender);
76 }
77 };
78 })();
80 function fallback() {
81 FirefoxCom.requestSync('fallback', null)
82 }
84 var BYTES_TO_LOAD = 32768;
85 var BYTES_TO_PARSE = 32768;
87 function runSniffer() {
88 var flashParams = JSON.parse(FirefoxCom.requestSync('getPluginParams', null));
89 document.head.getElementsByTagName('base')[0].href = flashParams.baseUrl;
90 movieUrl = flashParams.url;
91 document.getElementById('playbutton').addEventListener('click', function() {
92 switchToFullMode();
93 });
94 document.getElementById('fullmode').addEventListener('click', function() {
95 switchToFullMode();
96 return false;
97 });
98 document.getElementById('fallback').addEventListener('click', function() {
99 fallback();
100 return false;
101 });
102 FirefoxCom.requestSync('loadFile', {url: movieUrl, sessionId: 0, limit: BYTES_TO_LOAD});
103 }
105 var subscription, movieUrl, buffers = [];;
107 addEventListener("message", function handlerMessage(e) {
108 var args = e.data;
109 switch (args.callback) {
110 case "loadFile":
111 if (args.sessionId != 0) {
112 return;
113 }
114 switch (args.topic) {
115 case "progress":
116 buffers.push(args.array);
117 break;
118 case "error":
119 console.error('Unable to download ' + movieUrl + ': ' + args.error);
120 break;
121 case "close":
122 parseSwf();
123 break;
124 }
125 break;
126 }
127 }, true);
129 function inflateData(bytes, outputLength) {
130 verifyDeflateHeader(bytes);
131 var stream = new Stream(bytes, 2);
132 var output = {
133 data: new Uint8Array(outputLength),
134 available: 0,
135 completed: false
136 };
137 var state = {};
138 // inflate while we can
139 try {
140 do {
141 inflateBlock(stream, output, state);
142 } while (!output.completed && stream.pos < stream.end
143 && output.available < outputLength);
144 } catch (e) {
145 console.log('inflate aborted: ' + e);
146 }
147 return new Stream(output.data, 0, Math.min(output.available, outputLength));
148 }
150 function parseSwf() {
151 var sum = 0;
152 for (var i = 0; i < buffers.length; i++)
153 sum += buffers[i].length;
154 var data = new Uint8Array(sum), j = 0;
155 for (var i = 0; i < buffers.length; i++) {
156 data.set(buffers[i], j); j += buffers[i].length;
157 }
159 var backgroundColor;
160 try {
161 var magic1 = data[0];
162 var magic2 = data[1];
163 var magic3 = data[2];
164 if ((magic1 !== 70 && magic1 !== 67) || magic2 !== 87 || magic3 !== 83)
165 throw new Error('unsupported file format');
167 var compressed = magic1 === 67;
168 var stream = compressed ? inflateData(data.subarray(8), BYTES_TO_PARSE) :
169 new Stream(data, 8, data.length - 8);
170 var bytes = stream.bytes;
172 var SWF_TAG_CODE_SET_BACKGROUND_COLOR = 9;
173 var PREFETCH_SIZE = 17 /* RECT */ +
174 4 /* Frames rate and count */;;
175 stream.ensure(PREFETCH_SIZE);
176 var rectFieldSize = bytes[stream.pos] >> 3;
177 stream.pos += ((5 + 4 * rectFieldSize + 7) >> 3) + 4; // skipping other header fields
179 // for now just sniffing background color
180 while (stream.pos < stream.end &&
181 !backgroundColor) {
182 stream.ensure(2);
183 var tagCodeAndLength = stream.getUint16(stream.pos, true);
184 stream.pos += 2;
185 var tagCode = tagCodeAndLength >> 6;
186 var length = tagCodeAndLength & 0x3F;
187 if (length == 0x3F) {
188 stream.ensure(4);
189 length = stream.getInt32(stream.pos, true);
190 stream.pos += 4;
191 if (length < 0) throw new Error('invalid length');
192 }
193 stream.ensure(length);
194 switch (tagCode) {
195 case SWF_TAG_CODE_SET_BACKGROUND_COLOR:
196 backgroundColor = 'rgb(' + bytes[stream.pos] + ', ' +
197 bytes[stream.pos + 1] + ', ' +
198 bytes[stream.pos + 2] + ')';
199 break;
200 }
201 stream.pos += length;
202 }
203 } catch (e) {
204 console.log('parsing aborted: ' + e);
205 }
206 if (backgroundColor) {
207 document.body.style.backgroundColor = backgroundColor;
208 }
209 }
211 document.addEventListener('keydown', function (e) {
212 if (e.keyCode == 119 && e.ctrlKey) { // Ctrl+F8
213 window.location.replace("data:application/x-moz-playpreview;,application/x-shockwave-flash,full,paused=true");
214 }
215 }, false);
217 function switchToFullMode() {
218 window.location.replace("data:application/x-moz-playpreview;,application/x-shockwave-flash,full");
219 }
