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#ifndef SWAB_H
#define SWAB_H
/* casts are necessary for constants, because we never know how for sure
* how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way.
*/
#define ___swab16(x) \
({ \
__u16 __x = (x); \
((__u16)(\
(((__u16)(__x) & (__u16)0x00ffU) << 8) | \
(((__u16)(__x) & (__u16)0xff00U) >> 8))); \
})
#define ___swab32(x) \
({ \
__u32 __x = (x); \
((__u32)(\
(((__u32)(__x) & (__u32)0x000000ffUL) << 24) | \
(((__u32)(__x) & (__u32)0x0000ff00UL) << 8) | \
(((__u32)(__x) & (__u32)0x00ff0000UL) >> 8) | \
(((__u32)(__x) & (__u32)0xff000000UL) >> 24))); \
})
#define ___swab64(x) \
({ \
__u64 __x = (x); \
((__u64)(\
(__u64)(((__u64)(__x) & (__u64)0x00000000000000ffULL) << 56) | \
(__u64)(((__u64)(__x) & (__u64)0x000000000000ff00ULL) << 40) | \
(__u64)(((__u64)(__x) & (__u64)0x0000000000ff0000ULL) << 24) | \
(__u64)(((__u64)(__x) & (__u64)0x00000000ff000000ULL) << 8) | \
(__u64)(((__u64)(__x) & (__u64)0x000000ff00000000ULL) >> 8) | \
(__u64)(((__u64)(__x) & (__u64)0x0000ff0000000000ULL) >> 24) | \
(__u64)(((__u64)(__x) & (__u64)0x00ff000000000000ULL) >> 40) | \
(__u64)(((__u64)(__x) & (__u64)0xff00000000000000ULL) >> 56))); \
})
#define ___constant_swab16(x) \
((__u16)(\
(((__u16)(x) & (__u16)0x00ffU) << 8) | \
(((__u16)(x) & (__u16)0xff00U) >> 8)))
#define ___constant_swab32(x) \
((__u32)(\
(((__u32)(x) & (__u32)0x000000ffUL) << 24) | \
(((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \
(((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \
(((__u32)(x) & (__u32)0xff000000UL) >> 24)))
#define ___constant_swab64(x) \
((__u64)(\
(__u64)(((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) | \
(__u64)(((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) | \
(__u64)(((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) | \
(__u64)(((__u64)(x) & (__u64)0x00000000ff000000ULL) << 8) | \
(__u64)(((__u64)(x) & (__u64)0x000000ff00000000ULL) >> 8) | \
(__u64)(((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) | \
(__u64)(((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) | \
(__u64)(((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56)))
/*
* provide defaults when no architecture-specific optimization is detected
*/
#ifndef __arch__swab16
# define __arch__swab16(x) ({ __u16 __tmp = (x); ___swab16(__tmp); })
#endif
#ifndef __arch__swab32
# define __arch__swab32(x) ({ __u32 __tmp = (x); ___swab32(__tmp); })
#endif
#ifndef __arch__swab64
# define __arch__swab64(x) ({ __u64 __tmp = (x); ___swab64(__tmp); })
#endif
#ifndef __arch__swab16p
# define __arch__swab16p(x) __arch__swab16(*(x))
#endif
#ifndef __arch__swab32p
# define __arch__swab32p(x) __arch__swab32(*(x))
#endif
#ifndef __arch__swab64p
# define __arch__swab64p(x) __arch__swab64(*(x))
#endif
#ifndef __arch__swab16s
# define __arch__swab16s(x) do { *(x) = __arch__swab16p((x)); } while (0)
#endif
#ifndef __arch__swab32s
# define __arch__swab32s(x) do { *(x) = __arch__swab32p((x)); } while (0)
#endif
#ifndef __arch__swab64s
# define __arch__swab64s(x) do { *(x) = __arch__swab64p((x)); } while (0)
#endif
/*
* Allow constant folding
*/
# define __swab16(x) \
(__builtin_constant_p((__u16)(x)) ? \
___swab16((x)) : \
__fswab16((x)))
# define __swab32(x) \
(__builtin_constant_p((__u32)(x)) ? \
___swab32((x)) : \
__fswab32((x)))
# define __swab64(x) \
(__builtin_constant_p((__u64)(x)) ? \
___swab64((x)) : \
__fswab64((x)))
static __inline__ __u16 __fswab16(__u16 x)
{
return (__extension__ __arch__swab16(x));
}
static __inline__ __u16 __swab16p(__u16 *x)
{
return (__extension__ __arch__swab16p(x));
}
static __inline__ void __swab16s(__u16 *addr)
{
(__extension__ ({__arch__swab16s(addr);}));
}
static __inline__ __u32 __fswab32(__u32 x)
{
return (__extension__ __arch__swab32(x));
}
static __inline__ __u32 __swab32p(__u32 *x)
{
return (__extension__ __arch__swab32p(x));
}
static __inline__ void __swab32s(__u32 *addr)
{
(__extension__ ({__arch__swab32s(addr);}));
}
static __inline__ __u64 __fswab64(__u64 x)
{
# ifdef __SWAB_64_THRU_32__
__u32 h = x >> 32;
__u32 l = x & ((1ULL<<32)-1);
return (((__u64)__swab32(l)) << 32) | ((__u64)(__swab32(h)));
# else
return (__extension__ __arch__swab64(x));
# endif
}
static __inline__ __u64 __swab64p(__u64 *x)
{
return (__extension__ __arch__swab64p(x));
}
static __inline__ void __swab64s(__u64 *addr)
{
(__extension__ ({__arch__swab64s(addr);}));
}
#endif /* SWAB_H */
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