50 lines
1.0 KiB
50 lines
1.0 KiB
/* |
|
* Let's make sure we always have a sane definition for ntohl()/htonl(). |
|
* Some libraries define those as a function call, just to perform byte |
|
* shifting, bringing significant overhead to what should be a simple |
|
* operation. |
|
*/ |
|
|
|
/* |
|
* Default version that the compiler ought to optimize properly with |
|
* constant values. |
|
*/ |
|
static inline uint32_t default_swab32(uint32_t val) |
|
{ |
|
return (((val & 0xff000000) >> 24) | |
|
((val & 0x00ff0000) >> 8) | |
|
((val & 0x0000ff00) << 8) | |
|
((val & 0x000000ff) << 24)); |
|
} |
|
|
|
#undef bswap32 |
|
|
|
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) |
|
|
|
#define bswap32 git_bswap32 |
|
static inline uint32_t git_bswap32(uint32_t x) |
|
{ |
|
uint32_t result; |
|
if (__builtin_constant_p(x)) |
|
result = default_swab32(x); |
|
else |
|
__asm__("bswap %0" : "=r" (result) : "0" (x)); |
|
return result; |
|
} |
|
|
|
#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64)) |
|
|
|
#include <stdlib.h> |
|
|
|
#define bswap32(x) _byteswap_ulong(x) |
|
|
|
#endif |
|
|
|
#ifdef bswap32 |
|
|
|
#undef ntohl |
|
#undef htonl |
|
#define ntohl(x) bswap32(x) |
|
#define htonl(x) bswap32(x) |
|
|
|
#endif
|
|
|