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