1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/browser/extensions/shumway/content/web/preview.js Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,219 @@
1.4 +/* -*- Mode: js; js-indent-level: 2; indent-tabs-mode: nil; tab-width: 2 -*- */
1.5 +/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
1.6 +/*
1.7 + * Copyright 2013 Mozilla Foundation
1.8 + *
1.9 + * Licensed under the Apache License, Version 2.0 (the "License");
1.10 + * you may not use this file except in compliance with the License.
1.11 + * You may obtain a copy of the License at
1.12 + *
1.13 + * http://www.apache.org/licenses/LICENSE-2.0
1.14 + *
1.15 + * Unless required by applicable law or agreed to in writing, software
1.16 + * distributed under the License is distributed on an "AS IS" BASIS,
1.17 + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
1.18 + * See the License for the specific language governing permissions and
1.19 + * limitations under the License.
1.20 + */
1.21 +
1.22 +
1.23 +// Extenstion communication object
1.24 +var FirefoxCom = (function FirefoxComClosure() {
1.25 + return {
1.26 + /**
1.27 + * Creates an event that the extension is listening for and will
1.28 + * synchronously respond to.
1.29 + * NOTE: It is reccomended to use request() instead since one day we may not
1.30 + * be able to synchronously reply.
1.31 + * @param {String} action The action to trigger.
1.32 + * @param {String} data Optional data to send.
1.33 + * @return {*} The response.
1.34 + */
1.35 + requestSync: function(action, data) {
1.36 + var request = document.createTextNode('');
1.37 + document.documentElement.appendChild(request);
1.38 +
1.39 + var sender = document.createEvent('CustomEvent');
1.40 + sender.initCustomEvent('shumway.message', true, false,
1.41 + {action: action, data: data, sync: true});
1.42 + request.dispatchEvent(sender);
1.43 + var response = sender.detail.response;
1.44 + document.documentElement.removeChild(request);
1.45 + return response;
1.46 + },
1.47 + /**
1.48 + * Creates an event that the extension is listening for and will
1.49 + * asynchronously respond by calling the callback.
1.50 + * @param {String} action The action to trigger.
1.51 + * @param {String} data Optional data to send.
1.52 + * @param {Function} callback Optional response callback that will be called
1.53 + * with one data argument.
1.54 + */
1.55 + request: function(action, data, callback) {
1.56 + var request = document.createTextNode('');
1.57 + request.setUserData('action', action, null);
1.58 + request.setUserData('data', data, null);
1.59 + request.setUserData('sync', false, null);
1.60 + if (callback) {
1.61 + request.setUserData('callback', callback, null);
1.62 +
1.63 + document.addEventListener('shumway.response', function listener(event) {
1.64 + var node = event.target,
1.65 + response = event.detail.response;
1.66 +
1.67 + document.documentElement.removeChild(node);
1.68 +
1.69 + document.removeEventListener('shumway.response', listener, false);
1.70 + return callback(response);
1.71 + }, false);
1.72 + }
1.73 + document.documentElement.appendChild(request);
1.74 +
1.75 + var sender = document.createEvent('CustomEvent');
1.76 + sender.initCustomEvent('shumway.message', true, false,
1.77 + {action: action, data: data, sync: false});
1.78 + return request.dispatchEvent(sender);
1.79 + }
1.80 + };
1.81 +})();
1.82 +
1.83 +function fallback() {
1.84 + FirefoxCom.requestSync('fallback', null)
1.85 +}
1.86 +
1.87 +var BYTES_TO_LOAD = 32768;
1.88 +var BYTES_TO_PARSE = 32768;
1.89 +
1.90 +function runSniffer() {
1.91 + var flashParams = JSON.parse(FirefoxCom.requestSync('getPluginParams', null));
1.92 + document.head.getElementsByTagName('base')[0].href = flashParams.baseUrl;
1.93 + movieUrl = flashParams.url;
1.94 + document.getElementById('playbutton').addEventListener('click', function() {
1.95 + switchToFullMode();
1.96 + });
1.97 + document.getElementById('fullmode').addEventListener('click', function() {
1.98 + switchToFullMode();
1.99 + return false;
1.100 + });
1.101 + document.getElementById('fallback').addEventListener('click', function() {
1.102 + fallback();
1.103 + return false;
1.104 + });
1.105 + FirefoxCom.requestSync('loadFile', {url: movieUrl, sessionId: 0, limit: BYTES_TO_LOAD});
1.106 +}
1.107 +
1.108 +var subscription, movieUrl, buffers = [];;
1.109 +
1.110 +addEventListener("message", function handlerMessage(e) {
1.111 + var args = e.data;
1.112 + switch (args.callback) {
1.113 + case "loadFile":
1.114 + if (args.sessionId != 0) {
1.115 + return;
1.116 + }
1.117 + switch (args.topic) {
1.118 + case "progress":
1.119 + buffers.push(args.array);
1.120 + break;
1.121 + case "error":
1.122 + console.error('Unable to download ' + movieUrl + ': ' + args.error);
1.123 + break;
1.124 + case "close":
1.125 + parseSwf();
1.126 + break;
1.127 + }
1.128 + break;
1.129 + }
1.130 +}, true);
1.131 +
1.132 +function inflateData(bytes, outputLength) {
1.133 + verifyDeflateHeader(bytes);
1.134 + var stream = new Stream(bytes, 2);
1.135 + var output = {
1.136 + data: new Uint8Array(outputLength),
1.137 + available: 0,
1.138 + completed: false
1.139 + };
1.140 + var state = {};
1.141 + // inflate while we can
1.142 + try {
1.143 + do {
1.144 + inflateBlock(stream, output, state);
1.145 + } while (!output.completed && stream.pos < stream.end
1.146 + && output.available < outputLength);
1.147 + } catch (e) {
1.148 + console.log('inflate aborted: ' + e);
1.149 + }
1.150 + return new Stream(output.data, 0, Math.min(output.available, outputLength));
1.151 +}
1.152 +
1.153 +function parseSwf() {
1.154 + var sum = 0;
1.155 + for (var i = 0; i < buffers.length; i++)
1.156 + sum += buffers[i].length;
1.157 + var data = new Uint8Array(sum), j = 0;
1.158 + for (var i = 0; i < buffers.length; i++) {
1.159 + data.set(buffers[i], j); j += buffers[i].length;
1.160 + }
1.161 +
1.162 + var backgroundColor;
1.163 + try {
1.164 + var magic1 = data[0];
1.165 + var magic2 = data[1];
1.166 + var magic3 = data[2];
1.167 + if ((magic1 !== 70 && magic1 !== 67) || magic2 !== 87 || magic3 !== 83)
1.168 + throw new Error('unsupported file format');
1.169 +
1.170 + var compressed = magic1 === 67;
1.171 + var stream = compressed ? inflateData(data.subarray(8), BYTES_TO_PARSE) :
1.172 + new Stream(data, 8, data.length - 8);
1.173 + var bytes = stream.bytes;
1.174 +
1.175 + var SWF_TAG_CODE_SET_BACKGROUND_COLOR = 9;
1.176 + var PREFETCH_SIZE = 17 /* RECT */ +
1.177 + 4 /* Frames rate and count */;;
1.178 + stream.ensure(PREFETCH_SIZE);
1.179 + var rectFieldSize = bytes[stream.pos] >> 3;
1.180 + stream.pos += ((5 + 4 * rectFieldSize + 7) >> 3) + 4; // skipping other header fields
1.181 +
1.182 + // for now just sniffing background color
1.183 + while (stream.pos < stream.end &&
1.184 + !backgroundColor) {
1.185 + stream.ensure(2);
1.186 + var tagCodeAndLength = stream.getUint16(stream.pos, true);
1.187 + stream.pos += 2;
1.188 + var tagCode = tagCodeAndLength >> 6;
1.189 + var length = tagCodeAndLength & 0x3F;
1.190 + if (length == 0x3F) {
1.191 + stream.ensure(4);
1.192 + length = stream.getInt32(stream.pos, true);
1.193 + stream.pos += 4;
1.194 + if (length < 0) throw new Error('invalid length');
1.195 + }
1.196 + stream.ensure(length);
1.197 + switch (tagCode) {
1.198 + case SWF_TAG_CODE_SET_BACKGROUND_COLOR:
1.199 + backgroundColor = 'rgb(' + bytes[stream.pos] + ', ' +
1.200 + bytes[stream.pos + 1] + ', ' +
1.201 + bytes[stream.pos + 2] + ')';
1.202 + break;
1.203 + }
1.204 + stream.pos += length;
1.205 + }
1.206 + } catch (e) {
1.207 + console.log('parsing aborted: ' + e);
1.208 + }
1.209 + if (backgroundColor) {
1.210 + document.body.style.backgroundColor = backgroundColor;
1.211 + }
1.212 +}
1.213 +
1.214 +document.addEventListener('keydown', function (e) {
1.215 + if (e.keyCode == 119 && e.ctrlKey) { // Ctrl+F8
1.216 + window.location.replace("data:application/x-moz-playpreview;,application/x-shockwave-flash,full,paused=true");
1.217 + }
1.218 +}, false);
1.219 +
1.220 +function switchToFullMode() {
1.221 + window.location.replace("data:application/x-moz-playpreview;,application/x-shockwave-flash,full");
1.222 +}
