using System;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Drawing;

namespace BlittableStructure {
	static class Program {
		static class Blittable<T> where T : struct {
			public static readonly int Size = Marshal.SizeOf(typeof(T));
			
			[ThreadStatic]
			public static readonly byte[] SrcBuffer = new byte[Size];
			
			[ThreadStatic]
			public static readonly T[] DestBuffer = new T[1];
		}

		static T Read<T>(this Stream input) where T : struct {
			var size = Blittable<T>.Size;
			var srcbuf = Blittable<T>.SrcBuffer;
			var destbuf = Blittable<T>.DestBuffer;
			if (input.Read(srcbuf, 0, size) < size)
				throw new EndOfStreamException();
			var desthandle = GCHandle.Alloc(destbuf, GCHandleType.Pinned);
			try {
				var destptr = desthandle.AddrOfPinnedObject();
				Marshal.Copy(srcbuf, 0, destptr, size);
				return destbuf[0];
			} finally {
				desthandle.Free();
			}
		}
		
		public static void Main() {
			var data = new byte[] { 0x12, 0x34, 0x56, 0x78, 0x90, 0x12, 0x13, 0x45 };
			using (var stream = new MemoryStream(data)) {
				var point = stream.Read<Point>();
				Console.WriteLine("{0:X},{1:X}", point.X, point.Y);
			}
		}
	}
}