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Parsing / Reading SWF Header

/ Published in: ActionScript 3
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  1. var xURLLoader : URLLoader = new URLLoader();
  2. var xByte : uint;
  3. var xNBits : int;
  4. var xOffset : int;
  5.  
  6. pbGet.addEventListener(MouseEvent.CLICK, fOnClick);
  7. xURLLoader.addEventListener(Event.COMPLETE, fOnComplete);
  8. xURLLoader.dataFormat = URLLoaderDataFormat.BINARY;
  9.  
  10. function fParse(v : ByteArray) : Object
  11. {
  12. 	var vFormat : String;
  13. 	var vSwfVersion : int;
  14. 	var vFileLength : int;
  15. 	var vFrameRate : int;
  16. 	var vTotalFrames : int;
  17. 	var vFrameSize : Rectangle;
  18.  
  19. 	v.endian = Endian.LITTLE_ENDIAN;
  20.  
  21. 	vFormat = v.readUTFBytes(3);
  22. 	vSwfVersion = v.readByte();
  23. 	vFileLength = v.readUnsignedInt();
  24. 	v.readBytes(v);
  25. 	v.length -= 8;
  26. 	if (vFormat == "CWS")
  27. 		v.uncompress();
  28. 	v.position = 0;
  29. 	vFrameSize = new Rectangle();
  30. 	vFrameSize.left = xfReadNBits(v, true) / 20;
  31. 	vFrameSize.right = xfReadNBits(v) / 20;
  32. 	vFrameSize.top = xfReadNBits(v) / 20;
  33. 	vFrameSize.bottom = xfReadNBits(v) / 20;
  34. 	vFrameRate = v.readUnsignedByte() / 256 + v.readUnsignedByte();
  35. 	vTotalFrames = v.readUnsignedShort();
  36. 	return {
  37. 		mFormat: vFormat,
  38. 		mSwfVersion: vSwfVersion,
  39. 		mFileLength: vFileLength,
  40. 		mFrameSize: vFrameSize,
  41. 		mFrameRate: vFrameRate,
  42. 		mTotalFrames: vTotalFrames
  43. 	};
  44. }
  45.  
  46. function xfReadNBits(v : ByteArray, vStart : Boolean = false) : uint
  47. {
  48. 	var n : uint;
  49.  
  50. 	if (vStart)
  51. 	{
  52. 		xByte = v.readUnsignedByte();
  53. 		xNBits = xByte >> 3;
  54. 		xOffset = 3;
  55. 	}
  56.  
  57. 	n = xByte << (32 - xOffset) >> (32 - xNBits);
  58. 	xOffset -= xNBits;
  59. 	while (xOffset < 0)
  60. 	{
  61. 		xByte = v.readUnsignedByte();
  62. 		n |= (xOffset < -8) ? (xByte << (-xOffset - 8)) : (xByte >> (-xOffset - 8));
  63. 		xOffset += 8;
  64. 	}
  65. 	return n;
  66. }
  67.  
  68. function fOnClick(e : MouseEvent) : void
  69. {
  70. 	xURLLoader.load(new URLRequest("http://" + tfUrl.text));
  71. }
  72.  
  73. function fOnComplete(e : Event) : void
  74. {
  75. 	var i : int;
  76. 	var vData : Object;
  77.  
  78. 	vData = fParse(xURLLoader.data);
  79. 	tfFormat.text = vData.mFormat;
  80. 	tfVersion.text = vData.mSwfVersion;
  81. 	tfFileLength.text = vData.mFileLength;
  82. 	tfWidth.text = vData.mFrameSize.width;
  83. 	tfHeight.text = vData.mFrameSize.height;
  84. 	tfFrameRate.text = vData.mFrameRate;
  85. 	tfTotalFrames.text = vData.mTotalFrames;
  86. }

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