77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
/*
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* Copyright 2002-2004 by Hans Reiser, licensing governed by
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* reiserfsprogs/README
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*/
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#ifndef MISC_SWAB_H
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#define MISC_SWAB_H
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#define __swab16(x) \
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({ \
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__u16 __x = (x); \
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((__u16)( \
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(((__u16)(__x) & (__u16)0x00ffU) << 8) | \
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(((__u16)(__x) & (__u16)0xff00U) >> 8) )); \
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})
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#define __swab32(x) \
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({ \
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__u32 __x = (x); \
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((__u32)( \
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(((__u32)(__x) & (__u32)0x000000ffUL) << 24) | \
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(((__u32)(__x) & (__u32)0x0000ff00UL) << 8) | \
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(((__u32)(__x) & (__u32)0x00ff0000UL) >> 8) | \
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(((__u32)(__x) & (__u32)0xff000000UL) >> 24) )); \
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})
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#define __swab64(x) \
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({ \
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__u64 __x = (x); \
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((__u64)( \
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(__u64)(((__u64)(__x) & (__u64)0x00000000000000ffULL) << 56) | \
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(__u64)(((__u64)(__x) & (__u64)0x000000000000ff00ULL) << 40) | \
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(__u64)(((__u64)(__x) & (__u64)0x0000000000ff0000ULL) << 24) | \
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(__u64)(((__u64)(__x) & (__u64)0x00000000ff000000ULL) << 8) | \
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(__u64)(((__u64)(__x) & (__u64)0x000000ff00000000ULL) >> 8) | \
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(__u64)(((__u64)(__x) & (__u64)0x0000ff0000000000ULL) >> 24) | \
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(__u64)(((__u64)(__x) & (__u64)0x00ff000000000000ULL) >> 40) | \
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(__u64)(((__u64)(__x) & (__u64)0xff00000000000000ULL) >> 56) )); \
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})
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#ifndef WORDS_BIGENDIAN
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# define cpu_to_le16(val) (val)
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# define le16_to_cpu(val) (val)
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# define cpu_to_le32(val) (val)
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# define le32_to_cpu(val) (val)
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# define cpu_to_le64(val) (val)
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# define le64_to_cpu(val) (val)
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#elif defined(WORDS_BIGENDIAN)
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# define cpu_to_le16(val) __swab16(val)
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# define le16_to_cpu(val) __swab16(val)
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# define cpu_to_le32(val) __swab32(val)
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# define le32_to_cpu(val) __swab32(val)
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# define cpu_to_le64(val) __swab64(val)
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# define le64_to_cpu(val) __swab64(val)
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#else
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# error "nuxi/pdp-endian archs are not supported"
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#endif
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#define get_leXX(xx,p,field) (le##xx##_to_cpu ((p)->field))
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#define set_leXX(xx,p,field,val) do { (p)->field = cpu_to_le##xx(val); } while (0)
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#define get_le16(p,field) get_leXX (16, p, field)
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#define set_le16(p,field,val) set_leXX (16, p, field, val)
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#define get_le32(p,field) get_leXX (32, p, field)
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#define set_le32(p,field,val) set_leXX (32, p, field, val)
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#define get_le64(p,field) get_leXX (64, p, field)
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#define set_le64(p,field,val) set_leXX (64, p, field, val)
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#endif /* MISC_SWAB_H */
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