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193 lines
4.4 KiB
193 lines
4.4 KiB
#ifndef COMPAT_BSWAP_H |
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#define COMPAT_BSWAP_H |
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/* |
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* Let's make sure we always have a sane definition for ntohl()/htonl(). |
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* Some libraries define those as a function call, just to perform byte |
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* shifting, bringing significant overhead to what should be a simple |
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* operation. |
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*/ |
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/* |
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* Default version that the compiler ought to optimize properly with |
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* constant values. |
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*/ |
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static inline uint32_t default_swab32(uint32_t val) |
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{ |
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return (((val & 0xff000000) >> 24) | |
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((val & 0x00ff0000) >> 8) | |
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((val & 0x0000ff00) << 8) | |
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((val & 0x000000ff) << 24)); |
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} |
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static inline uint64_t default_bswap64(uint64_t val) |
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{ |
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return (((val & (uint64_t)0x00000000000000ffULL) << 56) | |
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((val & (uint64_t)0x000000000000ff00ULL) << 40) | |
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((val & (uint64_t)0x0000000000ff0000ULL) << 24) | |
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((val & (uint64_t)0x00000000ff000000ULL) << 8) | |
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((val & (uint64_t)0x000000ff00000000ULL) >> 8) | |
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((val & (uint64_t)0x0000ff0000000000ULL) >> 24) | |
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((val & (uint64_t)0x00ff000000000000ULL) >> 40) | |
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((val & (uint64_t)0xff00000000000000ULL) >> 56)); |
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} |
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#undef bswap32 |
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#undef bswap64 |
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#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) |
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#define bswap32 git_bswap32 |
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static inline uint32_t git_bswap32(uint32_t x) |
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{ |
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uint32_t result; |
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if (__builtin_constant_p(x)) |
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result = default_swab32(x); |
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else |
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__asm__("bswap %0" : "=r" (result) : "0" (x)); |
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return result; |
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} |
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#define bswap64 git_bswap64 |
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#if defined(__x86_64__) |
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static inline uint64_t git_bswap64(uint64_t x) |
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{ |
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uint64_t result; |
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if (__builtin_constant_p(x)) |
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result = default_bswap64(x); |
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else |
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__asm__("bswap %q0" : "=r" (result) : "0" (x)); |
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return result; |
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} |
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#else |
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static inline uint64_t git_bswap64(uint64_t x) |
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{ |
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union { uint64_t i64; uint32_t i32[2]; } tmp, result; |
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if (__builtin_constant_p(x)) |
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result.i64 = default_bswap64(x); |
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else { |
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tmp.i64 = x; |
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result.i32[0] = git_bswap32(tmp.i32[1]); |
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result.i32[1] = git_bswap32(tmp.i32[0]); |
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} |
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return result.i64; |
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} |
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#endif |
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#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64) || defined(_M_ARM64)) |
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#include <stdlib.h> |
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#define bswap32(x) _byteswap_ulong(x) |
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#define bswap64(x) _byteswap_uint64(x) |
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#endif |
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#if defined(bswap32) |
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#undef ntohl |
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#undef htonl |
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#define ntohl(x) bswap32(x) |
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#define htonl(x) bswap32(x) |
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#endif |
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#if defined(bswap64) |
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#undef ntohll |
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#undef htonll |
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#define ntohll(x) bswap64(x) |
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#define htonll(x) bswap64(x) |
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#else |
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#undef ntohll |
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#undef htonll |
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#if defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && defined(__BIG_ENDIAN) |
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# define GIT_BYTE_ORDER __BYTE_ORDER |
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# define GIT_LITTLE_ENDIAN __LITTLE_ENDIAN |
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# define GIT_BIG_ENDIAN __BIG_ENDIAN |
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#elif defined(BYTE_ORDER) && defined(LITTLE_ENDIAN) && defined(BIG_ENDIAN) |
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# define GIT_BYTE_ORDER BYTE_ORDER |
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# define GIT_LITTLE_ENDIAN LITTLE_ENDIAN |
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# define GIT_BIG_ENDIAN BIG_ENDIAN |
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#else |
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# define GIT_BIG_ENDIAN 4321 |
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# define GIT_LITTLE_ENDIAN 1234 |
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# if defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN) |
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# define GIT_BYTE_ORDER GIT_BIG_ENDIAN |
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# elif defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN) |
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# define GIT_BYTE_ORDER GIT_LITTLE_ENDIAN |
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# elif defined(__THW_BIG_ENDIAN__) && !defined(__THW_LITTLE_ENDIAN__) |
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# define GIT_BYTE_ORDER GIT_BIG_ENDIAN |
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# elif defined(__THW_LITTLE_ENDIAN__) && !defined(__THW_BIG_ENDIAN__) |
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# define GIT_BYTE_ORDER GIT_LITTLE_ENDIAN |
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# else |
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# error "Cannot determine endianness" |
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# endif |
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#endif |
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#if GIT_BYTE_ORDER == GIT_BIG_ENDIAN |
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# define ntohll(n) (n) |
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# define htonll(n) (n) |
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#else |
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# define ntohll(n) default_bswap64(n) |
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# define htonll(n) default_bswap64(n) |
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#endif |
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#endif |
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static inline uint16_t get_be16(const void *ptr) |
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{ |
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const unsigned char *p = ptr; |
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return (uint16_t)p[0] << 8 | |
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(uint16_t)p[1] << 0; |
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} |
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static inline uint32_t get_be32(const void *ptr) |
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{ |
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const unsigned char *p = ptr; |
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return (uint32_t)p[0] << 24 | |
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(uint32_t)p[1] << 16 | |
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(uint32_t)p[2] << 8 | |
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(uint32_t)p[3] << 0; |
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} |
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static inline uint64_t get_be64(const void *ptr) |
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{ |
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const unsigned char *p = ptr; |
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return (uint64_t)get_be32(&p[0]) << 32 | |
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(uint64_t)get_be32(&p[4]) << 0; |
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} |
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static inline void put_be32(void *ptr, uint32_t value) |
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{ |
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unsigned char *p = ptr; |
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p[0] = value >> 24; |
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p[1] = value >> 16; |
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p[2] = value >> 8; |
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p[3] = value >> 0; |
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} |
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static inline void put_be64(void *ptr, uint64_t value) |
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{ |
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unsigned char *p = ptr; |
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p[0] = value >> 56; |
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p[1] = value >> 48; |
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p[2] = value >> 40; |
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p[3] = value >> 32; |
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p[4] = value >> 24; |
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p[5] = value >> 16; |
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p[6] = value >> 8; |
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p[7] = value >> 0; |
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} |
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#endif /* COMPAT_BSWAP_H */
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