#ifndef _SWAB_H #define _SWAB_H /* * linux/byteorder/swab.h * Byte-swapping, independently from CPU endianness * swabXX[ps]?(foo) * * Francois-Rene Rideau <fare@tunes.org> 19971205 * separated swab functions from cpu_to_XX, * to clean up support for bizarre-endian architectures. * * See asm-i386/byteorder.h and suches for examples of how to provide * architecture-dependent optimized versions * */ /* casts are necessary for constants, because we never know how for sure * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way. */ #define swab16(x) \ ((unsigned short)( \ (((unsigned short)(x) & (unsigned short)0x00ffU) << 8) | \ (((unsigned short)(x) & (unsigned short)0xff00U) >> 8) )) #define swab32(x) \ ((unsigned int)( \ (((unsigned int)(x) & (unsigned int)0x000000ffUL) << 24) | \ (((unsigned int)(x) & (unsigned int)0x0000ff00UL) << 8) | \ (((unsigned int)(x) & (unsigned int)0x00ff0000UL) >> 8) | \ (((unsigned int)(x) & (unsigned int)0xff000000UL) >> 24) )) #endif /* _SWAB_H */