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