public static class IOExt
{
private static readonly uint[] _lookup32Unsafe = CreateLookup32Unsafe();
private static unsafe readonly uint* _lookup32UnsafeP = (uint*)GCHandle.Alloc(_lookup32Unsafe,GCHandleType.Pinned).AddrOfPinnedObject();
private static uint [ ] CreateLookup32Unsafe()
{
var result = new uint[256];
for ( int i = 0 ; i < 256 ; i++ )
{
string s=i.ToString("X2");
if ( BitConverter.IsLittleEndian )
result [ i ] = ( ( uint )s [ 0 ] ) + ( ( uint )s [ 1 ] << 16 );
else
result [ i ] = ( ( uint )s [ 1 ] ) + ( ( uint )s [ 0 ] << 16 );
}
return result;
}
public static string ByteArrayToHexViaLookup32Unsafe( byte [ ] bytes )
{
unsafe
{
var lookupP = _lookup32UnsafeP;
var result = new char[bytes.Length * 2];
fixed ( byte* bytesP = bytes )
fixed ( char* resultP = result )
{
uint* resultP2 = (uint*)resultP;
for ( int i = 0 ; i < bytes.Length ; i++ )
{
resultP2 [ i ] = lookupP [ bytesP [ i ] ];
}
}
return new string( result );
}
}
}
https://stackoverflow.com/a/24343727/6127030
