The Tor Browser: comparison browser/extensions/shumway/content/web/preview.js

comparison: browser/extensions/shumway/content/web/preview.js

browser/extensions/shumway/content/web/preview.js

changeset 0: 6474c204b198

equal deleted inserted replaced

--1:000000000000
+:79bc81104e41
+/* -*- Mode: js; js-indent-level: 2; indent-tabs-mode: nil; tab-width: 2 -*- */
+/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
+/*
+* Copyright 2013 Mozilla Foundation
+*
+* Licensed 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.
+*/
+// Extenstion communication object
+var FirefoxCom = (function FirefoxComClosure() {
+return {
+/**
+* Creates an event that the extension is listening for and will
+* synchronously respond to.
+* NOTE: It is reccomended to use request() instead since one day we may not
+* be able to synchronously reply.
+* @param {String} action The action to trigger.
+* @param {String} data Optional data to send.
+* @return {*} The response.
+*/
+requestSync: function(action, data) {
+var request = document.createTextNode('');
+document.documentElement.appendChild(request);
+var sender = document.createEvent('CustomEvent');
+sender.initCustomEvent('shumway.message', true, false,
+{action: action, data: data, sync: true});
+request.dispatchEvent(sender);
+var response = sender.detail.response;
+document.documentElement.removeChild(request);
+return response;
+},
+/**
+* Creates an event that the extension is listening for and will
+* asynchronously respond by calling the callback.
+* @param {String} action The action to trigger.
+* @param {String} data Optional data to send.
+* @param {Function} callback Optional response callback that will be called
+* with one data argument.
+*/
+request: function(action, data, callback) {
+var request = document.createTextNode('');
+request.setUserData('action', action, null);
+request.setUserData('data', data, null);
+request.setUserData('sync', false, null);
+if (callback) {
+request.setUserData('callback', callback, null);
+document.addEventListener('shumway.response', function listener(event) {
+var node = event.target,
+response = event.detail.response;
+document.documentElement.removeChild(node);
+document.removeEventListener('shumway.response', listener, false);
+return callback(response);
+}, false);
+}
+document.documentElement.appendChild(request);
+var sender = document.createEvent('CustomEvent');
+sender.initCustomEvent('shumway.message', true, false,
+{action: action, data: data, sync: false});
+return request.dispatchEvent(sender);
+}
+};
+})();
+function fallback() {
+FirefoxCom.requestSync('fallback', null)
+}
+var BYTES_TO_LOAD = 32768;
+var BYTES_TO_PARSE = 32768;
+function runSniffer() {
+var flashParams = JSON.parse(FirefoxCom.requestSync('getPluginParams', null));
+document.head.getElementsByTagName('base')[0].href = flashParams.baseUrl;
+movieUrl = flashParams.url;
+document.getElementById('playbutton').addEventListener('click', function() {
+switchToFullMode();
+});
+document.getElementById('fullmode').addEventListener('click', function() {
+switchToFullMode();
+return false;
+});
+document.getElementById('fallback').addEventListener('click', function() {
+fallback();
+return false;
+});
+FirefoxCom.requestSync('loadFile', {url: movieUrl, sessionId: 0, limit: BYTES_TO_LOAD});
+}
+var subscription, movieUrl, buffers = [];;
+addEventListener("message", function handlerMessage(e) {
+var args = e.data;
+switch (args.callback) {
+case "loadFile":
+if (args.sessionId != 0) {
+return;
+}
+switch (args.topic) {
+case "progress":
+buffers.push(args.array);
+break;
+case "error":
+console.error('Unable to download ' + movieUrl + ': ' + args.error);
+break;
+case "close":
+parseSwf();
+break;
+}
+break;
+}
+}, true);
+function inflateData(bytes, outputLength) {
+verifyDeflateHeader(bytes);
+var stream = new Stream(bytes, 2);
+var output = {
+data: new Uint8Array(outputLength),
+available: 0,
+completed: false
+};
+var state = {};
+// inflate while we can
+try {
+do {
+inflateBlock(stream, output, state);
+} while (!output.completed && stream.pos < stream.end
+&& output.available < outputLength);
+} catch (e) {
+console.log('inflate aborted: ' + e);
+}
+return new Stream(output.data, 0, Math.min(output.available, outputLength));
+}
+function parseSwf() {
+var sum = 0;
+for (var i = 0; i < buffers.length; i++)
+sum += buffers[i].length;
+var data = new Uint8Array(sum), j = 0;
+for (var i = 0; i < buffers.length; i++) {
+data.set(buffers[i], j); j += buffers[i].length;
+}
+var backgroundColor;
+try {
+var magic1 = data[0];
+var magic2 = data[1];
+var magic3 = data[2];
+if ((magic1 !== 70 && magic1 !== 67) || magic2 !== 87 || magic3 !== 83)
+throw new Error('unsupported file format');
+var compressed = magic1 === 67;
+var stream = compressed ? inflateData(data.subarray(8), BYTES_TO_PARSE) :
+new Stream(data, 8, data.length - 8);
+var bytes = stream.bytes;
+var SWF_TAG_CODE_SET_BACKGROUND_COLOR = 9;
+var PREFETCH_SIZE = 17 /* RECT */ +
+4  /* Frames rate and count */;;
+stream.ensure(PREFETCH_SIZE);
+var rectFieldSize = bytes[stream.pos] >> 3;
+stream.pos += ((5 + 4 * rectFieldSize + 7) >> 3) + 4; // skipping other header fields
+// for now just sniffing background color
+while (stream.pos < stream.end &&
+!backgroundColor) {
+stream.ensure(2);
+var tagCodeAndLength = stream.getUint16(stream.pos, true);
+stream.pos += 2;
+var tagCode = tagCodeAndLength >> 6;
+var length = tagCodeAndLength & 0x3F;
+if (length == 0x3F) {
+stream.ensure(4);
+length = stream.getInt32(stream.pos, true);
+stream.pos += 4;
+if (length < 0) throw new Error('invalid length');
+}
+stream.ensure(length);
+switch (tagCode) {
+case SWF_TAG_CODE_SET_BACKGROUND_COLOR:
+backgroundColor = 'rgb(' + bytes[stream.pos] + ', ' +
+bytes[stream.pos + 1] + ', ' +
+bytes[stream.pos + 2] + ')';
+break;
+}
+stream.pos += length;
+}
+} catch (e) {
+console.log('parsing aborted: ' + e);
+}
+if (backgroundColor) {
+document.body.style.backgroundColor = backgroundColor;
+}
+}
+document.addEventListener('keydown', function (e) {
+if (e.keyCode == 119 && e.ctrlKey) { // Ctrl+F8
+window.location.replace("data:application/x-moz-playpreview;,application/x-shockwave-flash,full,paused=true");
+}
+}, false);
+function switchToFullMode() {
+window.location.replace("data:application/x-moz-playpreview;,application/x-shockwave-flash,full");
+}