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static const union {
uint8_t u8[2];
uint16_t u16;
} EndianMix = {{ 1, 0 }};
FORCE_INLINE int IsBigEndian()
{
// Constant-folded by the compiler.
return EndianMix.u16 != 1;
}
#if defined(_MSC_VER)
# include <stdlib.h>
# define BSWAP32(u) _byteswap_ulong(u)
# define BSWAP64(u) _byteswap_uint64(u)
#else
# ifdef __has_builtin
# if __has_builtin(__builtin_bswap32)
# define BSWAP32(u) __builtin_bswap32(u)
# endif // __has_builtin(__builtin_bswap32)
# if __has_builtin(__builtin_bswap64)
# define BSWAP64(u) __builtin_bswap64(u)
# endif // __has_builtin(__builtin_bswap64)
# elif defined(__GNUC__) && ( \
__GNUC__ > 4 || ( \
__GNUC__ == 4 && ( \
__GNUC_MINOR__ >= 3 \
) \
) \
)
# define BSWAP32(u) __builtin_bswap32(u)
# define BSWAP64(u) __builtin_bswap64(u)
# endif // __has_builtin
#endif // defined(_MSC_VER)
#ifndef BSWAP32
FORCE_INLINE uint32_t BSWAP32(uint32_t u)
{
return (((u & 0xff000000) >> 24)
| ((u & 0x00ff0000) >> 8)
| ((u & 0x0000ff00) << 8)
| ((u & 0x000000ff) << 24));
}
#endif
#ifndef BSWAP64
FORCE_INLINE uint64_t BSWAP64(uint64_t u)
{
return (((u & 0xff00000000000000ULL) >> 56)
| ((u & 0x00ff000000000000ULL) >> 40)
| ((u & 0x0000ff0000000000ULL) >> 24)
| ((u & 0x000000ff00000000ULL) >> 8)
| ((u & 0x00000000ff000000ULL) << 8)
| ((u & 0x0000000000ff0000ULL) << 24)
| ((u & 0x000000000000ff00ULL) << 40)
| ((u & 0x00000000000000ffULL) << 56));
}
#endif
#if defined(__clang__) || defined(__GNUC__) && __GNUC__ >= 8
# define NO_SANITIZE_ALIGNMENT __attribute__((no_sanitize("alignment")))
#else
# define NO_SANITIZE_ALIGNMENT
#endif
NO_SANITIZE_ALIGNMENT
FORCE_INLINE uint32_t getblock32 ( const uint32_t * const p, const int i)
{
if (IsBigEndian()) {
return BSWAP32(p[i]);
} else {
return p[i];
}
}
NO_SANITIZE_ALIGNMENT
FORCE_INLINE uint64_t getblock64 ( const uint64_t * const p, const int i)
{
if (IsBigEndian()) {
return BSWAP64(p[i]);
} else {
return p[i];
}
}
#undef NO_SANITIZE_ALIGNMENT
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