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Byte Swapping Structs For Conversion From Big To Little Endian (Byte Order)

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  1. public void Main()
  2. {
  3. 	var beBytes = new byte[] {
  4. 		0x80, 
  5. 		0x80, 
  6. 		0x80, 
  7. 		0x80, 
  8. 		0x80,0, 
  9. 		0x80,0, 
  10. 		0x80,0,0,0, 
  11. 		0x80,0,0,0,
  12. 		0x80,0,0,0,0,0,0,0, 
  13. 		0x80,0,0,0,0,0,0,0,
  14. //		0x3F,0x80,0,0,
  15. //		0x3F,0xF0,0,0,0,0,0,0,
  16. //		0x30,0,0,0,0,0,0,0,0,0,
  17. 		0x54,0x65,0x73,0x74,0x69,0x6E,0x67,0,0,0
  18. 	};
  19. 	var leBytes = new byte[] {
  20. 		0x80, 
  21. 		0x80, 
  22. 		0x80, 
  23. 		0x80, 
  24. 		0,0x80,
  25. 		0,0x80, 
  26. 		0,0,0,0x80,
  27. 		0,0,0,0x80, 
  28. 		0,0,0,0,0,0,0,0x80, 
  29. 		0,0,0,0,0,0,0,0x80, 
  30. //		0,0,0x80,0x3F,
  31. //		0,0,0,0,0,0,0xF0,0x3F,
  32. //		0x30,0,0,0,0,0,0,0,0,0,
  33. 		0x54,0x65,0x73,0x74,0x69,0x6E,0x67,0,0,0
  34. 	};
  35. 	Foo fooLe = ByteArrayToStructure<Foo>(leBytes).Dump("LE");
  36. 	Foo fooBe = ByteArrayToStructureBigEndian<Foo>(beBytes, 
  37. 		"bbbbsSiIlL"
  38. //		+ "fd"		
  39. 		+"9bb").Dump("BE");
  40. //	Assert.AreEqual(fooLe, fooBe);
  41. }
  42.  
  43. [StructLayout(LayoutKind.Sequential, Pack = 1)]
  44. public struct Foo  {
  45. 	public byte b1;
  46. 	public byte b2;
  47. 	public byte b3;
  48. 	public byte b4;
  49. 	public short s;
  50. 	public ushort S;
  51. 	public int i;
  52. 	public uint I;
  53. 	public long l;
  54. 	public ulong L;
  55. //	public float f;
  56. //	public double d;
  57. 	[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 10)]
  58. 	public string MyString;
  59. }
  60.  
  61. T ByteArrayToStructure<T>(byte[] bytes) where T: struct 
  62. {
  63. 	GCHandle handle = GCHandle.Alloc(bytes, GCHandleType.Pinned);
  64. 	T stuff = (T)Marshal.PtrToStructure(handle.AddrOfPinnedObject(),typeof(T));
  65. 	handle.Free();
  66. 	return stuff;
  67. }
  68.  
  69. T ByteArrayToStructureBigEndian<T>(byte[] bytes, string description) where T: struct 
  70. {
  71. 	byte[] buffer = bytes;
  72. 	IList unpacked = DataConverter.Unpack("^"+description, buffer, 0).Dump("unpacked");
  73. 	buffer = DataConverter.PackEnumerable("!"+description, unpacked).Dump("packed");
  74. 	return ByteArrayToStructure<T>(buffer);
  75. }

URL: http://stackoverflow.com/questions/2480116/marshalling-a-big-endian-byte-collection-into-a-struct-in-order-to-pull-out-value/2678472#2678472

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