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  1. using System;
  2. using System.Diagnostics;
  3. using System.IO;
  4. using System.Reflection;
  5. using System.Runtime.CompilerServices;
  6. using System.Runtime.InteropServices;
  7. using System.Drawing;
  8.  
  9. namespace BlittableStructure {
  10. 	static class Program {
  11. 		static class Blittable<T> where T : struct {
  12. 			public static readonly int Size = Marshal.SizeOf(typeof(T));
  13.  
  14. 			[ThreadStatic]
  15. 			public static readonly byte[] SrcBuffer = new byte[Size];
  16.  
  17. 			[ThreadStatic]
  18. 			public static readonly T[] DestBuffer = new T[1];
  19. 		}
  20.  
  21. 		static T Read<T>(this Stream input) where T : struct {
  22. 			var size = Blittable<T>.Size;
  23. 			var srcbuf = Blittable<T>.SrcBuffer;
  24. 			var destbuf = Blittable<T>.DestBuffer;
  25. 			if (input.Read(srcbuf, 0, size) < size)
  26. 				throw new EndOfStreamException();
  27. 			var desthandle = GCHandle.Alloc(destbuf, GCHandleType.Pinned);
  28. 			try {
  29. 				var destptr = desthandle.AddrOfPinnedObject();
  30. 				Marshal.Copy(srcbuf, 0, destptr, size);
  31. 				return destbuf[0];
  32. 			} finally {
  33. 				desthandle.Free();
  34. 			}
  35. 		}
  36.  
  37. 		public static void Main() {
  38. 			var data = new byte[] { 0x12, 0x34, 0x56, 0x78, 0x90, 0x12, 0x13, 0x45 };
  39. 			using (var stream = new MemoryStream(data)) {
  40. 				var point = stream.Read<Point>();
  41. 				Console.WriteLine("{0:X},{1:X}", point.X, point.Y);
  42. 			}
  43. 		}
  44. 	}
  45. }
  46.  
Success #stdin #stdout 0.04s 24232KB
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Standard input is empty
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78563412,45131290
https://ideone.com/FS9jcM
more speed! more performance!!
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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