45 lines
1.6 KiB
C
45 lines
1.6 KiB
C
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#ifndef _SWAB_H
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#define _SWAB_H
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/*
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* linux/byteorder/swab.h
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* Byte-swapping, independently from CPU endianness
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* swabXX[ps]?(foo)
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*
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* Francois-Rene Rideau <fare@tunes.org> 19971205
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* separated swab functions from cpu_to_XX,
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* to clean up support for bizarre-endian architectures.
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*
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* See asm-i386/byteorder.h and suches for examples of how to provide
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* architecture-dependent optimized versions
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*
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*/
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/* casts are necessary for constants, because we never know for sure
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* how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way.
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*/
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#define swab16(x) \
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((unsigned short)( \
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(((unsigned short)(x) & (unsigned short)0x00ffU) << 8) | \
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(((unsigned short)(x) & (unsigned short)0xff00U) >> 8)))
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#define swab32(x) \
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((unsigned int)( \
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(((unsigned int)(x) & (unsigned int)0x000000ffUL) << 24) | \
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(((unsigned int)(x) & (unsigned int)0x0000ff00UL) << 8) | \
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(((unsigned int)(x) & (unsigned int)0x00ff0000UL) >> 8) | \
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(((unsigned int)(x) & (unsigned int)0xff000000UL) >> 24)))
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#define swab64(x) \
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((uint64_t)( \
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(((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) | \
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(((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) | \
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(((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \
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(((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) << 8) | \
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(((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >> 8) | \
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(((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \
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(((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \
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(((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56)))
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#endif /* _SWAB_H */
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