forked from xt-sys/exectos
73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
/**
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* PROJECT: ExectOS
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* COPYRIGHT: See COPYING.md in the top level directory
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* FILE: xtoskrnl/rtl/byteswap.c
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* DESCRIPTION: Endian conversion routines
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* DEVELOPERS: Rafal Kupiec <belliash@codingworkshop.eu.org>
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*/
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#include <xtos.h>
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/**
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* This routine converts endianness on 16bit value.
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*
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* @param Source
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* Supplies a value to swap bytes.
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*
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* @return Swapped 16bit value.
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*
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* @since XT 1.0
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*/
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XTFASTCALL
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USHORT
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RtlByteSwap16(IN USHORT Source)
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{
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return (USHORT)(((Source >> 8) & 0x00FF) |
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((Source << 8) & 0xFF00));
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}
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/**
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* This routine converts endianness on 32bit value.
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*
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* @param Source
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* Supplies a value to swap bytes.
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*
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* @return Swapped 32bit value.
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*
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* @since XT 1.0
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*/
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XTFASTCALL
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ULONG
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RtlByteSwap32(IN ULONG Source)
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{
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return (ULONG)(((Source >> 24) & 0x000000FF) |
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((Source >> 8) & 0x0000FF00) |
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((Source << 8) & 0x00FF0000) |
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((Source << 24) & 0xFF000000));
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}
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/**
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* This routine converts endianness on 64bit value.
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*
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* @param Source
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* Supplies a value to swap bytes.
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*
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* @return Swapped 64bit value.
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*
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* @since XT 1.0
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*/
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XTFASTCALL
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ULONGLONG
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RtlByteSwap64(IN ULONGLONG Source)
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{
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return (ULONGLONG)(((Source >> 56) & 0x00000000000000FF) |
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((Source >> 40) & 0x000000000000FF00) |
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((Source >> 24) & 0x0000000000FF0000) |
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((Source >> 8) & 0x00000000FF000000) |
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((Source << 8) & 0x000000FF00000000) |
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((Source << 24) & 0x0000FF0000000000) |
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((Source << 40) & 0x00FF000000000000) |
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((Source << 56) & 0xFF00000000000000));
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}
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