在我们的PC机中,C#的数字是LittleEndian的,导致在做网络协议和和文件解析时有许多不便,因此,我写了个BigEndian的数字的类,这里记录一下,以后还会经常用到。
static class BigEndianUIntHelper
{
public static uint ToUInt32(byte[] data)
{
Contract.Assume(data.Length <= 4);
return BitConverter.ToUInt32(new byte[4 - data.Length].Concat(data).Reverse().ToArray(), 0);
}
public static byte[] ToBytes(uint num, int size)
{
Contract.Assume(size <= 4);
return BitConverter.GetBytes(num).Take(size).Reverse().ToArray();
}
}
[StructLayout(LayoutKind.Sequential)]
struct BigEndianUInt24
{
const int size = 3;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = size)]
byte[] data;
public static implicit operator uint(BigEndianUInt24 d) { return BigEndianUIntHelper.ToUInt32(d.data); }
public static implicit operator BigEndianUInt24(uint d) { return new BigEndianUInt24() { data = BigEndianUIntHelper.ToBytes(d, size) }; }
public override string ToString() { return ((uint)this).ToString(); }
}
[StructLayout(LayoutKind.Sequential)]
struct BigEndianUInt32
{
const int size = 4;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = size)]
byte[] data;
public static implicit operator uint(BigEndianUInt32 d) { return BigEndianUIntHelper.ToUInt32(d.data); }
public static implicit operator BigEndianUInt32(uint d) { return new BigEndianUInt32 { data = BigEndianUIntHelper.ToBytes(d, size) }; }
public override string ToString() { return ((uint)this).ToString(); }
}
其实这里BigEndianUIntHelper的两个函数应该优化一下的,这里为了图简单,就直接用BitConverter的现成方法了。以后有需要再弄好了。
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