Byte Endian
/****************************************************************************************************************
* *
* Copyright (C) 2011 5173.com *
* This project may be copied only under the terms of the Apache License 2.0. *
* Please visit the project Home Page http://bqqapicsharp.codeplex.com/ for more detail. *
* *
****************************************************************************************************************/
namespace BQQAPIClient.Core.Utility
{
using System;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
internal static class Protocol
{
internal static byte[] GetBigEndianBytes(this ushort v)
{
return BitConverter.GetBytes(v.SwapEndian());
}
internal static byte[] GetBigEndianBytes(this uint v)
{
return BitConverter.GetBytes(v.SwapEndian());
}
internal static byte[] GetBigEndianBytes(this ulong v)
{
return BitConverter.GetBytes(v.SwapEndian());
}
internal static ushort GetLittleEndianUInt16(this byte[] data)
{
return data.GetLittleEndianUInt16(0);
}
internal static uint GetLittleEndianUInt32(this byte[] data)
{
return data.GetLittleEndianUInt32(0);
}
internal static ulong GetLittleEndianUInt64(this byte[] data)
{
return data.GetLittleEndianUInt64(0);
}
internal static ushort GetLittleEndianUInt16(this byte[] data, int index)
{
return BitConverter.ToUInt16(data, index).SwapEndian();
}
internal static uint GetLittleEndianUInt32(this byte[] data, int index)
{
return BitConverter.ToUInt32(data, index).SwapEndian();
}
internal static ulong GetLittleEndianUInt64(this byte[] data, int index)
{
return BitConverter.ToUInt64(data, index).SwapEndian();
}
internal static T BytesToStruct<T>(this byte[] rawData) where T : IToBytes
{
T result = default(T);
RespectEndianness(typeof(T), rawData);
GCHandle handle = GCHandle.Alloc(rawData, GCHandleType.Pinned);
try
{
IntPtr rawDataPtr = handle.AddrOfPinnedObject();
result = (T)Marshal.PtrToStructure(rawDataPtr, typeof(T));
}
finally
{
handle.Free();
}
return result;
}
internal static byte[] StructToBytes<T>(this T data) where T : IToBytes
{
byte[] rawData = new byte[Marshal.SizeOf(data)];
GCHandle handle = GCHandle.Alloc(rawData, GCHandleType.Pinned);
try
{
IntPtr rawDataPtr = handle.AddrOfPinnedObject();
Marshal.StructureToPtr(data, rawDataPtr, false);
}
finally
{
handle.Free();
}
RespectEndianness(typeof(T), rawData);
return rawData;
}
private static void RespectEndianness(Type type, byte[] data)
{
var fields = type.GetFields(BindingFlags.NonPublic | BindingFlags.Instance).Select(field => new
{
Field = field,
Offset = Marshal.OffsetOf(type, field.Name).ToInt32()
}).ToList();
fields.ForEach(item => Array.Reverse(data, item.Offset, Marshal.SizeOf(item.Field.FieldType)));
}
private static ushort SwapEndian(this ushort v)
{
return (ushort)(((v & 0xff) << 8) | ((v >> 8) & 0xff));
}
private static uint SwapEndian(this uint v)
{
return (uint)(((SwapEndian((ushort)v) & 0xffff) << 0x10) |
(SwapEndian((ushort)(v >> 0x10)) & 0xffff));
}
internal static ulong SwapEndian(this ulong v)
{
return (ulong)(((SwapEndian((uint)v) & 0xffffffffL) << 0x20) |
(SwapEndian((uint)(v >> 0x20)) & 0xffffffffL));
}
}
}
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