Greg Watson | 4f566ca | 2004-03-13 03:37:11 +0000 | [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 | * |
Martin Roth | 0cb07e3 | 2013-07-09 21:46:01 -0600 | [diff] [blame] | 13 | * See asm-i386/byteorder.h and such for examples of how to provide |
Greg Watson | 4f566ca | 2004-03-13 03:37:11 +0000 | [diff] [blame] | 14 | * architecture-dependent optimized versions |
| 15 | * |
| 16 | */ |
| 17 | |
| 18 | /* casts are necessary for constants, because we never know how for sure |
| 19 | * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way. |
| 20 | */ |
| 21 | #define swab16(x) \ |
| 22 | ((unsigned short)( \ |
| 23 | (((unsigned short)(x) & (unsigned short)0x00ffU) << 8) | \ |
| 24 | (((unsigned short)(x) & (unsigned short)0xff00U) >> 8) )) |
| 25 | |
| 26 | #define swab32(x) \ |
| 27 | ((unsigned int)( \ |
| 28 | (((unsigned int)(x) & (unsigned int)0x000000ffUL) << 24) | \ |
| 29 | (((unsigned int)(x) & (unsigned int)0x0000ff00UL) << 8) | \ |
| 30 | (((unsigned int)(x) & (unsigned int)0x00ff0000UL) >> 8) | \ |
| 31 | (((unsigned int)(x) & (unsigned int)0xff000000UL) >> 24) )) |
| 32 | |
Stefan Reinauer | 9ea33e9 | 2011-10-14 15:11:16 -0700 | [diff] [blame] | 33 | #define swab64(x) \ |
| 34 | ((uint64_t)( \ |
| 35 | (((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) | \ |
| 36 | (((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) | \ |
| 37 | (((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \ |
| 38 | (((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) << 8) | \ |
| 39 | (((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >> 8) | \ |
| 40 | (((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \ |
| 41 | (((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \ |
| 42 | (((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56) )) |
| 43 | |
Greg Watson | 4f566ca | 2004-03-13 03:37:11 +0000 | [diff] [blame] | 44 | #endif /* _SWAB_H */ |