/*- * Copyright (c) 2002 Thomas Moestl * Copyright (c) 2005 Robert N. M. Watson * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Derived from FreeBSD src/sys/sys/endian.h:1.6. * $P4: //depot/projects/trustedbsd/openbsm/compat/endian.h#8 $ */ #ifndef _COMPAT_ENDIAN_H_ #define _COMPAT_ENDIAN_H_ /* * Some systems will have the uint/int types defined here already, others * will need stdint.h. */ #ifdef HAVE_STDINT_H #include #endif /* * Some operating systems do not yet have the more recent endian APIs that * permit encoding to and decoding from byte streams. For those systems, we * implement local non-optimized versions. */ static __inline uint16_t bswap16(uint16_t int16) { const unsigned char *from; unsigned char *to; uint16_t t; from = (const unsigned char *) &int16; to = (unsigned char *) &t; to[0] = from[1]; to[1] = from[0]; return (t); } static __inline uint32_t bswap32(uint32_t int32) { const unsigned char *from; unsigned char *to; uint32_t t; from = (const unsigned char *) &int32; to = (unsigned char *) &t; to[0] = from[3]; to[1] = from[2]; to[2] = from[1]; to[3] = from[0]; return (t); } static __inline uint64_t bswap64(uint64_t int64) { const unsigned char *from; unsigned char *to; uint64_t t; from = (const unsigned char *) &int64; to = (unsigned char *) &t; to[0] = from[7]; to[1] = from[6]; to[2] = from[5]; to[3] = from[4]; to[4] = from[3]; to[5] = from[2]; to[6] = from[1]; to[7] = from[0]; return (t); } #if defined(BYTE_ORDER) && !defined(_BYTE_ORDER) #define _BYTE_ORDER BYTE_ORDER #endif #if !defined(_BYTE_ORDER) #error "Neither BYTE_ORDER nor _BYTE_ORDER defined" #endif #if defined(BIG_ENDIAN) && !defined(_BIG_ENDIAN) #define _BIG_ENDIAN BIG_ENDIAN #endif #if defined(LITTLE_ENDIAN) && !defined(_LITTLE_ENDIAN) #define _LITTLE_ENDIAN LITTLE_ENDIAN #endif /* * Host to big endian, host to little endian, big endian to host, and little * endian to host byte order functions as detailed in byteorder(9). */ #if _BYTE_ORDER == _LITTLE_ENDIAN #define htobe16(x) bswap16((x)) #define htobe32(x) bswap32((x)) #define htobe64(x) bswap64((x)) #define htole16(x) ((uint16_t)(x)) #define htole32(x) ((uint32_t)(x)) #define htole64(x) ((uint64_t)(x)) #define be16toh(x) bswap16((x)) #define be32toh(x) bswap32((x)) #define be64toh(x) bswap64((x)) #define le16toh(x) ((uint16_t)(x)) #define le32toh(x) ((uint32_t)(x)) #define le64toh(x) ((uint64_t)(x)) #else /* _BYTE_ORDER != _LITTLE_ENDIAN */ #define htobe16(x) ((uint16_t)(x)) #define htobe32(x) ((uint32_t)(x)) #define htobe64(x) ((uint64_t)(x)) #define htole16(x) bswap16((x)) #define htole32(x) bswap32((x)) #define htole64(x) bswap64((x)) #define be16toh(x) ((uint16_t)(x)) #define be32toh(x) ((uint32_t)(x)) #define be64toh(x) ((uint64_t)(x)) #define le16toh(x) bswap16((x)) #define le32toh(x) bswap32((x)) #define le64toh(x) bswap64((x)) #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */ /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ static __inline uint16_t be16dec(const void *pp) { unsigned char const *p = (unsigned char const *)pp; return ((p[0] << 8) | p[1]); } static __inline uint32_t be32dec(const void *pp) { unsigned char const *p = (unsigned char const *)pp; return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); } static __inline uint64_t be64dec(const void *pp) { unsigned char const *p = (unsigned char const *)pp; return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4)); } static __inline uint16_t le16dec(const void *pp) { unsigned char const *p = (unsigned char const *)pp; return ((p[1] << 8) | p[0]); } static __inline uint32_t le32dec(const void *pp) { unsigned char const *p = (unsigned char const *)pp; return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]); } static __inline uint64_t le64dec(const void *pp) { unsigned char const *p = (unsigned char const *)pp; return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p)); } static __inline void be16enc(void *pp, uint16_t u) { unsigned char *p = (unsigned char *)pp; p[0] = (u >> 8) & 0xff; p[1] = u & 0xff; } static __inline void be32enc(void *pp, uint32_t u) { unsigned char *p = (unsigned char *)pp; p[0] = (u >> 24) & 0xff; p[1] = (u >> 16) & 0xff; p[2] = (u >> 8) & 0xff; p[3] = u & 0xff; } static __inline void be64enc(void *pp, uint64_t u) { unsigned char *p = (unsigned char *)pp; be32enc(p, u >> 32); be32enc(p + 4, u & 0xffffffff); } static __inline void le16enc(void *pp, uint16_t u) { unsigned char *p = (unsigned char *)pp; p[0] = u & 0xff; p[1] = (u >> 8) & 0xff; } static __inline void le32enc(void *pp, uint32_t u) { unsigned char *p = (unsigned char *)pp; p[0] = u & 0xff; p[1] = (u >> 8) & 0xff; p[2] = (u >> 16) & 0xff; p[3] = (u >> 24) & 0xff; } static __inline void le64enc(void *pp, uint64_t u) { unsigned char *p = (unsigned char *)pp; le32enc(p, u & 0xffffffff); le32enc(p + 4, u >> 32); } #endif /* _COMPAT_ENDIAN_H_ */