mirror of https://git.tukaani.org/xz.git
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
///////////////////////////////////////////////////////////////////////////////
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//
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/// \file bswap.h
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/// \brief Byte swapping
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//
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// Author: Lasse Collin
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//
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// This file has been put into the public domain.
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// You can do whatever you want with this file.
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//
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///////////////////////////////////////////////////////////////////////////////
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#ifndef LZMA_BSWAP_H
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#define LZMA_BSWAP_H
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// NOTE: We assume that config.h is already #included.
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// At least glibc has byteswap.h which contains inline assembly code for
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// byteswapping. Some systems have byteswap.h but lack one or more of the
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// bswap_xx macros/functions, which is why we check them separately even
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// if byteswap.h is available.
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#ifdef HAVE_BYTESWAP_H
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# include <byteswap.h>
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#endif
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#ifndef HAVE_BSWAP_16
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# define bswap_16(num) \
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(((num) << 8) | ((num) >> 8))
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#endif
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#ifndef HAVE_BSWAP_32
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# define bswap_32(num) \
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( (((num) << 24) ) \
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| (((num) << 8) & UINT32_C(0x00FF0000)) \
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| (((num) >> 8) & UINT32_C(0x0000FF00)) \
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| (((num) >> 24) ) )
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#endif
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#ifndef HAVE_BSWAP_64
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# define bswap_64(num) \
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( (((num) << 56) ) \
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| (((num) << 40) & UINT64_C(0x00FF000000000000)) \
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| (((num) << 24) & UINT64_C(0x0000FF0000000000)) \
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| (((num) << 8) & UINT64_C(0x000000FF00000000)) \
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| (((num) >> 8) & UINT64_C(0x00000000FF000000)) \
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| (((num) >> 24) & UINT64_C(0x0000000000FF0000)) \
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| (((num) >> 40) & UINT64_C(0x000000000000FF00)) \
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| (((num) >> 56) ) )
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#endif
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#endif
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