52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
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/** @file Macros for performing byte swapping for quick endian conversion.
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It will try to use the fast built-in machine instructions first
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and fall back to the slow conversion if none were found.
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*/
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#ifndef ENDIAN_SWAP_H
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#define ENDIAN_SWAP_H
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#ifdef __GNUG__ /* GCC, ICC and Clang */
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# ifdef __APPLE__
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# include <machine/endian.h>
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# else
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# include <endian.h>
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# endif
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# define BYTESWAP_16(x) (__builtin_bswap16 (x))
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# define BYTESWAP_32(x) (__builtin_bswap32 (x))
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# define BYTESWAP_64(x) (__builtin_bswap64 (x))
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#elif _MSC_VER /* MSVC */
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# include <stdlib.h>
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# define BYTESWAP_16(x) (_byteswap_ushort (x))
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# define BYTESWAP_32(x) (_byteswap_ulong (x))
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# define BYTESWAP_64(x) (_byteswap_uint64 (x))
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#else
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# warning "Unknown byte swapping built-ins (do it the slow way)!"
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# define BYTESWAP_16(x) ((x) >> 8) | (((x) & 0xFFUL) << 8)
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# define BYTESWAP_32(x) ((x) >> 24) | (((x) >> 8) & 0xFF00UL) | \
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(((x) & 0xFF00UL) << 8) | ((x) << 24)
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# define BYTESWAP_64(x) \
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((x) >> 56) | \
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(((x) & 0x00FF000000000000ULL) >> 48) | \
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(((x) & 0x0000FF0000000000ULL) >> 40) | \
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(((x) & 0x000000FF00000000ULL) >> 32) | \
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(((x) & 0x00000000FF000000ULL) << 32) | \
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(((x) & 0x0000000000FF0000ULL) << 40) | \
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(((x) & 0x000000000000FF00ULL) << 48) | \
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(((x) & 0x00000000000000FFULL) << 56)
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#endif
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#endif /* ENDIAN_SWAP_H */
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