michael@0: /* -*- Mode: js; js-indent-level: 2; indent-tabs-mode: nil; tab-width: 2 -*- */
michael@0: /* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
michael@0: /*
michael@0:  * Copyright 2013 Mozilla Foundation
michael@0:  *
michael@0:  * Licensed under the Apache License, Version 2.0 (the "License");
michael@0:  * you may not use this file except in compliance with the License.
michael@0:  * You may obtain a copy of the License at
michael@0:  *
michael@0:  *     http://www.apache.org/licenses/LICENSE-2.0
michael@0:  *
michael@0:  * Unless required by applicable law or agreed to in writing, software
michael@0:  * distributed under the License is distributed on an "AS IS" BASIS,
michael@0:  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
michael@0:  * See the License for the specific language governing permissions and
michael@0:  * limitations under the License.
michael@0:  */
michael@0: 
michael@0: 
michael@0: // Extenstion communication object
michael@0: var FirefoxCom = (function FirefoxComClosure() {
michael@0:   return {
michael@0:     /**
michael@0:      * Creates an event that the extension is listening for and will
michael@0:      * synchronously respond to.
michael@0:      * NOTE: It is reccomended to use request() instead since one day we may not
michael@0:      * be able to synchronously reply.
michael@0:      * @param {String} action The action to trigger.
michael@0:      * @param {String} data Optional data to send.
michael@0:      * @return {*} The response.
michael@0:      */
michael@0:     requestSync: function(action, data) {
michael@0:       var request = document.createTextNode('');
michael@0:       document.documentElement.appendChild(request);
michael@0: 
michael@0:       var sender = document.createEvent('CustomEvent');
michael@0:       sender.initCustomEvent('shumway.message', true, false,
michael@0:           {action: action, data: data, sync: true});
michael@0:       request.dispatchEvent(sender);
michael@0:       var response = sender.detail.response;
michael@0:       document.documentElement.removeChild(request);
michael@0:       return response;
michael@0:     },
michael@0:     /**
michael@0:      * Creates an event that the extension is listening for and will
michael@0:      * asynchronously respond by calling the callback.
michael@0:      * @param {String} action The action to trigger.
michael@0:      * @param {String} data Optional data to send.
michael@0:      * @param {Function} callback Optional response callback that will be called
michael@0:      * with one data argument.
michael@0:      */
michael@0:     request: function(action, data, callback) {
michael@0:       var request = document.createTextNode('');
michael@0:       request.setUserData('action', action, null);
michael@0:       request.setUserData('data', data, null);
michael@0:       request.setUserData('sync', false, null);
michael@0:       if (callback) {
michael@0:         request.setUserData('callback', callback, null);
michael@0: 
michael@0:         document.addEventListener('shumway.response', function listener(event) {
michael@0:           var node = event.target,
michael@0:               response = event.detail.response;
michael@0: 
michael@0:           document.documentElement.removeChild(node);
michael@0: 
michael@0:           document.removeEventListener('shumway.response', listener, false);
michael@0:           return callback(response);
michael@0:         }, false);
michael@0:       }
michael@0:       document.documentElement.appendChild(request);
michael@0: 
michael@0:       var sender = document.createEvent('CustomEvent');
michael@0:       sender.initCustomEvent('shumway.message', true, false,
michael@0:           {action: action, data: data, sync: false});
michael@0:       return request.dispatchEvent(sender);
michael@0:     }
michael@0:   };
michael@0: })();
michael@0: 
michael@0: function fallback() {
michael@0:   FirefoxCom.requestSync('fallback', null)
michael@0: }
michael@0: 
michael@0: var BYTES_TO_LOAD = 32768;
michael@0: var BYTES_TO_PARSE = 32768;
michael@0: 
michael@0: function runSniffer() {
michael@0:   var flashParams = JSON.parse(FirefoxCom.requestSync('getPluginParams', null));
michael@0:   document.head.getElementsByTagName('base')[0].href = flashParams.baseUrl;
michael@0:   movieUrl = flashParams.url;
michael@0:   document.getElementById('playbutton').addEventListener('click', function() {
michael@0:     switchToFullMode();
michael@0:   });
michael@0:   document.getElementById('fullmode').addEventListener('click', function() {
michael@0:     switchToFullMode();
michael@0:     return false;
michael@0:   });
michael@0:   document.getElementById('fallback').addEventListener('click', function() {
michael@0:     fallback();
michael@0:     return false;
michael@0:   });
michael@0:   FirefoxCom.requestSync('loadFile', {url: movieUrl, sessionId: 0, limit: BYTES_TO_LOAD});
michael@0: }
michael@0: 
michael@0: var subscription, movieUrl, buffers = [];;
michael@0: 
michael@0: addEventListener("message", function handlerMessage(e) {
michael@0:   var args = e.data;
michael@0:   switch (args.callback) {
michael@0:     case "loadFile":
michael@0:       if (args.sessionId != 0) {
michael@0:         return;
michael@0:       }
michael@0:       switch (args.topic) {
michael@0:         case "progress":
michael@0:           buffers.push(args.array);
michael@0:           break;
michael@0:         case "error":
michael@0:           console.error('Unable to download ' + movieUrl + ': ' + args.error);
michael@0:           break;
michael@0:         case "close":
michael@0:           parseSwf();
michael@0:           break;
michael@0:       }
michael@0:       break;
michael@0:   }
michael@0: }, true);
michael@0: 
michael@0: function inflateData(bytes, outputLength) {
michael@0:   verifyDeflateHeader(bytes);
michael@0:   var stream = new Stream(bytes, 2);
michael@0:   var output = {
michael@0:     data: new Uint8Array(outputLength),
michael@0:     available: 0,
michael@0:     completed: false
michael@0:   };
michael@0:   var state = {};
michael@0:   // inflate while we can
michael@0:   try {
michael@0:     do {
michael@0:       inflateBlock(stream, output, state);
michael@0:     } while (!output.completed && stream.pos < stream.end
michael@0:         && output.available < outputLength);
michael@0:   } catch (e) {
michael@0:     console.log('inflate aborted: ' + e);
michael@0:   }
michael@0:   return new Stream(output.data, 0, Math.min(output.available, outputLength));
michael@0: }
michael@0: 
michael@0: function parseSwf() {
michael@0:   var sum = 0;
michael@0:   for (var i = 0; i < buffers.length; i++)
michael@0:     sum += buffers[i].length;
michael@0:   var data = new Uint8Array(sum), j = 0;
michael@0:   for (var i = 0; i < buffers.length; i++) {
michael@0:     data.set(buffers[i], j); j += buffers[i].length;
michael@0:   }
michael@0: 
michael@0:   var backgroundColor;
michael@0:   try {
michael@0:     var magic1 = data[0];
michael@0:     var magic2 = data[1];
michael@0:     var magic3 = data[2];
michael@0:     if ((magic1 !== 70 && magic1 !== 67) || magic2 !== 87 || magic3 !== 83)
michael@0:       throw new Error('unsupported file format');
michael@0: 
michael@0:     var compressed = magic1 === 67;
michael@0:     var stream = compressed ? inflateData(data.subarray(8), BYTES_TO_PARSE) :
michael@0:         new Stream(data, 8, data.length - 8);
michael@0:     var bytes = stream.bytes;
michael@0: 
michael@0:     var SWF_TAG_CODE_SET_BACKGROUND_COLOR = 9;
michael@0:     var PREFETCH_SIZE = 17 /* RECT */ +
michael@0:         4  /* Frames rate and count */;;
michael@0:     stream.ensure(PREFETCH_SIZE);
michael@0:     var rectFieldSize = bytes[stream.pos] >> 3;
michael@0:     stream.pos += ((5 + 4 * rectFieldSize + 7) >> 3) + 4; // skipping other header fields
michael@0: 
michael@0:     // for now just sniffing background color
michael@0:     while (stream.pos < stream.end &&
michael@0:         !backgroundColor) {
michael@0:       stream.ensure(2);
michael@0:       var tagCodeAndLength = stream.getUint16(stream.pos, true);
michael@0:       stream.pos += 2;
michael@0:       var tagCode = tagCodeAndLength >> 6;
michael@0:       var length = tagCodeAndLength & 0x3F;
michael@0:       if (length == 0x3F) {
michael@0:         stream.ensure(4);
michael@0:         length = stream.getInt32(stream.pos, true);
michael@0:         stream.pos += 4;
michael@0:         if (length < 0) throw new Error('invalid length');
michael@0:       }
michael@0:       stream.ensure(length);
michael@0:       switch (tagCode) {
michael@0:         case SWF_TAG_CODE_SET_BACKGROUND_COLOR:
michael@0:           backgroundColor = 'rgb(' + bytes[stream.pos] + ', ' +
michael@0:               bytes[stream.pos + 1] + ', ' +
michael@0:               bytes[stream.pos + 2] + ')';
michael@0:           break;
michael@0:       }
michael@0:       stream.pos += length;
michael@0:     }
michael@0:   } catch (e) {
michael@0:     console.log('parsing aborted: ' + e);
michael@0:   }
michael@0:   if (backgroundColor) {
michael@0:     document.body.style.backgroundColor = backgroundColor;
michael@0:   }
michael@0: }
michael@0: 
michael@0: document.addEventListener('keydown', function (e) {
michael@0:   if (e.keyCode == 119 && e.ctrlKey) { // Ctrl+F8
michael@0:     window.location.replace("data:application/x-moz-playpreview;,application/x-shockwave-flash,full,paused=true");
michael@0:   }
michael@0: }, false);
michael@0: 
michael@0: function switchToFullMode() {
michael@0:   window.location.replace("data:application/x-moz-playpreview;,application/x-shockwave-flash,full");
michael@0: }