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/*-
* 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.
*/
#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 <stdint.h>
#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
/* XXX: Hack. */
#ifndef htobe16
/*
* 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 */
#endif
#endif /* _COMPAT_ENDIAN_H_ */
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