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Diffstat (limited to 'contrib/openbsm/compat/endian.h')
| -rw-r--r-- | contrib/openbsm/compat/endian.h | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/contrib/openbsm/compat/endian.h b/contrib/openbsm/compat/endian.h new file mode 100644 index 0000000..2517a41 --- /dev/null +++ b/contrib/openbsm/compat/endian.h @@ -0,0 +1,264 @@ +/*- + * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org> + * 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#5 $ + */ + +#ifndef _COMPAT_ENDIAN_H_ +#define _COMPAT_ENDIAN_H_ + +/* + * Pick up value of BYTE_ORDER/_BYTE_ORDER if not yet included. + */ +#include <machine/endian.h> + +/* + * Some systems will have the uint/int types defined here already, others + * will need stdint.h. + */ +#include <stdint.h> + +/* + * 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_ */ |
