reactos/lib/rtl/byteswap.c

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/* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS system libraries
* FILE: lib/rtl/mem.c
* PURPOSE: Memory functions
* PROGRAMMER: David Welch (welch@mcmail.com)
*/
/* INCLUDES *****************************************************************/
#include <rtl.h>
#define NDEBUG
#include <debug.h>
#if defined(_M_IX86)
/* RtlUlonglongByteSwap is broken and cannot be done in C on x86 */
#error "Use rtlswap.S!"
#endif
#undef RtlUlonglongByteSwap
#undef RtlUlongByteSwap
#undef RtlUshortByteSwap
/*************************************************************************
* RtlUshortByteSwap
*
* Swap the bytes of an unsigned short value.
*
* NOTES
* Based on the inline versions in Wine winternl.h
*
* @implemented
*/
USHORT
FASTCALL
RtlUshortByteSwap(
IN USHORT Source)
{
#if defined(_M_AMD64)
return _byteswap_ushort(Source);
#else
return (Source >> 8) | (Source << 8);
#endif
}
/*************************************************************************
* RtlUlongByteSwap [NTDLL.@]
*
* Swap the bytes of an unsigned int value.
*
* NOTES
* Based on the inline versions in Wine winternl.h
*
* @implemented
*/
ULONG
FASTCALL
RtlUlongByteSwap(
IN ULONG Source)
{
#if defined(_M_AMD64)
return _byteswap_ulong(Source);
#else
return ((ULONG)RtlUshortByteSwap((USHORT)Source) << 16) | RtlUshortByteSwap((USHORT)(Source >> 16));
#endif
}
/*************************************************************************
* RtlUlonglongByteSwap
*
* Swap the bytes of an unsigned long long value.
*
* PARAMS
* i [I] Value to swap bytes of
*
* RETURNS
* The value with its bytes swapped.
*
* @implemented
*/
ULONGLONG FASTCALL
RtlUlonglongByteSwap(
IN ULONGLONG Source)
{
#if defined(_M_AMD64)
return _byteswap_uint64(Source);
#else
return ((ULONGLONG) RtlUlongByteSwap (Source) << 32) | RtlUlongByteSwap (Source>>32);
#endif
}
/* EOF */