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