Stefan Reinauer | a1e4824 | 2011-10-21 14:24:57 -0700 | [diff] [blame] | 1 | #ifndef _SWAB_H |
| 2 | #define _SWAB_H |
| 3 | |
| 4 | /* |
| 5 | * linux/byteorder/swab.h |
| 6 | * Byte-swapping, independently from CPU endianness |
| 7 | * swabXX[ps]?(foo) |
| 8 | * |
| 9 | * Francois-Rene Rideau <fare@tunes.org> 19971205 |
| 10 | * separated swab functions from cpu_to_XX, |
| 11 | * to clean up support for bizarre-endian architectures. |
| 12 | * |
| 13 | * See asm-i386/byteorder.h and suches for examples of how to provide |
| 14 | * architecture-dependent optimized versions |
| 15 | * |
| 16 | */ |
| 17 | |
Sol Boucher | 158dd55 | 2015-05-07 21:00:05 -0700 | [diff] [blame] | 18 | #if !defined(__APPLE__) && !defined(__NetBSD__) |
| 19 | #define ntohl(x) (is_big_endian() ? (uint32_t)(x) : swab32(x)) |
| 20 | #define htonl(x) (is_big_endian() ? (uint32_t)(x) : swab32(x)) |
zbao | fb456e6 | 2015-09-16 13:27:22 -0700 | [diff] [blame] | 21 | #else |
Sol Boucher | 158dd55 | 2015-05-07 21:00:05 -0700 | [diff] [blame] | 22 | #include <arpa/inet.h> |
| 23 | #endif |
| 24 | #define ntohll(x) (is_big_endian() ? (uint64_t)(x) : swab64(x)) |
| 25 | #define htonll(x) (is_big_endian() ? (uint64_t)(x) : swab64(x)) |
| 26 | |
Stefan Reinauer | a1e4824 | 2011-10-21 14:24:57 -0700 | [diff] [blame] | 27 | /* casts are necessary for constants, because we never know how for sure |
| 28 | * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way. |
| 29 | */ |
| 30 | #define swab16(x) \ |
| 31 | ((unsigned short)( \ |
| 32 | (((unsigned short)(x) & (unsigned short)0x00ffU) << 8) | \ |
| 33 | (((unsigned short)(x) & (unsigned short)0xff00U) >> 8) )) |
| 34 | |
| 35 | #define swab32(x) \ |
| 36 | ((unsigned int)( \ |
| 37 | (((unsigned int)(x) & (unsigned int)0x000000ffUL) << 24) | \ |
| 38 | (((unsigned int)(x) & (unsigned int)0x0000ff00UL) << 8) | \ |
| 39 | (((unsigned int)(x) & (unsigned int)0x00ff0000UL) >> 8) | \ |
| 40 | (((unsigned int)(x) & (unsigned int)0xff000000UL) >> 24) )) |
| 41 | |
| 42 | #define swab64(x) \ |
| 43 | ((uint64_t)( \ |
| 44 | (((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) | \ |
| 45 | (((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) | \ |
| 46 | (((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \ |
| 47 | (((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) << 8) | \ |
| 48 | (((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >> 8) | \ |
| 49 | (((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \ |
| 50 | (((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \ |
| 51 | (((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56) )) |
| 52 | |
Sol Boucher | 158dd55 | 2015-05-07 21:00:05 -0700 | [diff] [blame] | 53 | /* common.c */ |
| 54 | int is_big_endian(void); |
| 55 | |
Stefan Reinauer | a1e4824 | 2011-10-21 14:24:57 -0700 | [diff] [blame] | 56 | #endif /* _SWAB_H */ |