133 lines
2.1 KiB
C
133 lines
2.1 KiB
C
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/*++
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Copyright (c) 1997 Microsoft Corporation
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Module Name:
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byteswap.c
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Abstract:
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This module defines functions for performing endian conversions.
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Author:
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Forrest Foltz (forrestf) 10-Dec-1997
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Revision History:
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--*/
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#include "nt.h"
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#include "ntrtlp.h"
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#undef RtlUshortByteSwap
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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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/*++
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Routine Description:
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The RtlUshortByteSwap function exchanges bytes 0 and 1 of Source
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and returns the resulting USHORT.
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Arguments:
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Source - 16-bit value to byteswap.
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Return Value:
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Swapped 16-bit value.
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--*/
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{
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USHORT swapped;
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swapped = ((Source) << (8 * 1)) |
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((Source) >> (8 * 1));
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return swapped;
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}
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#undef RtlUlongByteSwap
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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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/*++
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Routine Description:
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The RtlUlongByteSwap function exchanges byte pairs 0:3 and 1:2 of
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Source and returns the resulting ULONG.
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Arguments:
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Source - 32-bit value to byteswap.
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Return Value:
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Swapped 32-bit value.
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--*/
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{
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ULONG swapped;
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swapped = ((Source) << (8 * 3)) |
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((Source & 0x0000FF00) << (8 * 1)) |
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((Source & 0x00FF0000) >> (8 * 1)) |
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((Source) >> (8 * 3));
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return swapped;
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}
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#undef RtlUlonglongByteSwap
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ULONGLONG
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FASTCALL
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RtlUlonglongByteSwap(
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IN ULONGLONG Source
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)
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/*++
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Routine Description:
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The RtlUlongByteSwap function exchanges byte pairs 0:7, 1:6, 2:5, and
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3:4 of Source and returns the resulting ULONGLONG.
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Arguments:
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Source - 64-bit value to byteswap.
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Return Value:
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Swapped 64-bit value.
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--*/
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{
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ULONGLONG swapped;
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swapped = ((Source) << (8 * 7)) |
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((Source & 0x000000000000FF00) << (8 * 5)) |
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((Source & 0x0000000000FF0000) << (8 * 3)) |
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((Source & 0x00000000FF000000) << (8 * 1)) |
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((Source & 0x000000FF00000000) >> (8 * 1)) |
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((Source & 0x0000FF0000000000) >> (8 * 3)) |
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((Source & 0x00FF000000000000) >> (8 * 5)) |
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((Source) >> (8 * 7));
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return swapped;
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}
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