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/*************************************************
* Byte Swapping Operations Header File *
* (C) 1999-2008 Jack Lloyd *
*************************************************/
#ifndef BOTAN_BSWAP_H__
#define BOTAN_BSWAP_H__
#include <botan/types.h>
#include <botan/rotate.h>
namespace Botan {
/*************************************************
* Byte Swapping Functions *
*************************************************/
inline u16bit reverse_bytes(u16bit input)
{
return rotate_left(input, 8);
}
inline u32bit reverse_bytes(u32bit input)
{
input = ((input & 0xFF00FF00) >> 8) | ((input & 0x00FF00FF) << 8);
return rotate_left(input, 16);
}
inline u64bit reverse_bytes(u64bit input)
{
u32bit hi = ((input >> 40) & 0x00FF00FF) | ((input >> 24) & 0xFF00FF00);
u32bit lo = ((input & 0xFF00FF00) >> 8) | ((input & 0x00FF00FF) << 8);
hi = (hi << 16) | (hi >> 16);
lo = (lo << 16) | (lo >> 16);
return (static_cast<u64bit>(lo) << 32) | hi;
}
}
#endif
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