src/loader.js

   1 goog.provide('FlappLoader');
   2 goog.require('FlappIBit');
   3 goog.require('FlappSWFHeader')
   4 goog.require('FlappSWFTag')
   5 goog.require('FlappBitmap')
   6
   7 goog.scope(function() {
   8
   9 /**
  10  * @constructor
  11  */
  12 FlappLoader = function(flapp) {
  13     this.flapp = flapp;
  14 };
  15
  16 FlappLoader.prototype = {
  17     fromURL: function(url, dict, movieClip) {
  18         console.debug("FlappLoader.prototype.fromURL("+url+",flapp,dict,movieClip");
  19         var xhr = new XMLHttpRequest();
  20         var ibit = new FlappIBit();
  21         var loader = this;
  22         this.header = null;
  23         xhr.onreadystatechange = function() {
  24             if (xhr.readyState > 1) {
  25                 if (xhr.status == 200) {
  26                     if (xhr.responseText) {
  27                         ibit.input(xhr.responseText);
  28                         loader.parse(ibit, dict, movieClip);
  29                     }
  30                 }
  31             }
  32         };
  33         xhr.open('GET', url);
  34         // xhr.responseType = 'arraybuffer';
  35         xhr.overrideMimeType('text/plain; charset=x-user-defined');
  36         xhr.send(null);
  37     },
  38     parse: function(ibit, dict, movieClip) {
  39         // console.debug("FlappLoader.prototype.parse");
  40         if (ibit.len() < 20) { // 20 is minumum size for swf header, maybe.
  41             return ;
  42         }
  43         if (this.header === null) {
  44             this.header = FlappSWFHeader.load(ibit);
  45             console.debug(this.header);
  46             this.flapp.setHeader(this.header);
  47         }
  48         var jpegTables = null;
  49         while (ibit.a(), ibit.hasNext(2)) {
  50             var headPos = ibit.getBytePos();
  51             var tag_and_length = ibit.ui16(); // tag and length
  52             var code = tag_and_length >>> 6;
  53             var length = tag_and_length & 0x3f;
  54             if (length === 0x3f) {
  55                 if (ibit.hasNext(4) === false) {
  56                     ibit.setPos(headPos, 0);
  57                     break;
  58                 }
  59                 length = ibit.ui32();
  60             }
  61             if (ibit.hasNext(length) === false) {
  62                 ibit.setPos(headPos, 0);
  63                 break;
  64             }
  65             var startOfContent = ibit.getBytePos();
  66             var tag = FlappSWFTag.load(code, length, ibit);
  67 //              console.debug(tag);
  68             switch (code) {
  69             case 1: // ShowFrame
  70                 movieClip.appendControlTag(tag);
  71                 break;
  72             case 2: // DefineShape
  73             case 22: // DefineShape2
  74             case 32: // DefineShape3
  75                 dict.set(tag.id, tag);
  76                 break;
  77             case 6: // DefineBits(JPEG)
  78                 var jpeg = FlappBitmap.toJpeg(tag.jpegData, jpegTables);
  79                 var image = new Image();
  80                 image.src = "data:image/jpeg;base64," + goog.global.btoa(jpeg);
  81                 tag.image = image;
  82                 dict.set(tag.id, tag);
  83                 break;
  84             case 8: // JPEGTables
  85                 jpegTables = tag;
  86                 break;
  87             case 9: // SetBackgroundColor
  88                 // set canvas background
  89                 break;
  90             case 12: // DoAction
  91                 movieClip.appendControlTag(tag);
  92                 break;
  93             case 26: // PlaceObject2
  94                 movieClip.appendControlTag(tag);
  95                 break;
  96             case 39: // DefineSprite
  97                 dict.set(tag.id, tag);
  98                 break;
  99             default:
 100                 console.warn("Unknown swf tag code:"+code);
 101                 break;
 102             }
 103             ibit.setPos(startOfContent + length, 0);
 104         }
 105     }
 106 };
 107
 108 });