341 lines
9 KiB
C
341 lines
9 KiB
C
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/* $NetBSD: endian.h,v 1.28 2009/08/08 21:23:15 christos Exp $ */
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/*
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* Copyright (c) 1987, 1991, 1993
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* The Regents of the University of California. 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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* @(#)endian.h 8.1 (Berkeley) 6/11/93
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*/
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#ifndef _SYS_ENDIAN_H_
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#define _SYS_ENDIAN_H_
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#include <sys/featuretest.h>
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/*
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* Definitions for byte order, according to byte significance from low
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* address to high.
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*/
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#define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
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#define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
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#define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
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#if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE)
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#ifndef _LOCORE
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/* C-family endian-ness definitions */
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#include <sys/ansi.h>
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#ifndef in_addr_t
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typedef __in_addr_t in_addr_t;
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#define in_addr_t __in_addr_t
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#endif
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#ifndef in_port_t
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typedef __in_port_t in_port_t;
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#define in_port_t __in_port_t
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#endif
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__BEGIN_DECLS
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uint32_t htonl(uint32_t) __constfunc;
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uint16_t htons(uint16_t) __constfunc;
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uint32_t ntohl(uint32_t) __constfunc;
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uint16_t ntohs(uint16_t) __constfunc;
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__END_DECLS
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#endif /* !_LOCORE */
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#endif /* _XOPEN_SOURCE || _NETBSD_SOURCE */
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#include <machine/endian_machdep.h>
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/*
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* Define the order of 32-bit words in 64-bit words.
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*/
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#if _BYTE_ORDER == _LITTLE_ENDIAN
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#define _QUAD_HIGHWORD 1
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#define _QUAD_LOWWORD 0
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#endif
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#if _BYTE_ORDER == _BIG_ENDIAN
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#define _QUAD_HIGHWORD 0
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#define _QUAD_LOWWORD 1
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#endif
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#if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE)
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/*
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* Traditional names for byteorder. These are defined as the numeric
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* sequences so that third party code can "#define XXX_ENDIAN" and not
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* cause errors.
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*/
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#define LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
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#define BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
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#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
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#define BYTE_ORDER _BYTE_ORDER
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#ifndef _LOCORE
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#include <machine/bswap.h>
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/*
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* Macros for network/external number representation conversion.
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*/
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#if BYTE_ORDER == BIG_ENDIAN && !defined(__lint__)
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#define ntohl(x) (x)
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#define ntohs(x) (x)
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#define htonl(x) (x)
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#define htons(x) (x)
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#define NTOHL(x) (void) (x)
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#define NTOHS(x) (void) (x)
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#define HTONL(x) (void) (x)
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#define HTONS(x) (void) (x)
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#else /* LITTLE_ENDIAN || !defined(__lint__) */
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#define ntohl(x) bswap32(__CAST(uint32_t, (x)))
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#define ntohs(x) bswap16(__CAST(uint16_t, (x)))
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#define htonl(x) bswap32(__CAST(uint32_t, (x)))
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#define htons(x) bswap16(__CAST(uint16_t, (x)))
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#define NTOHL(x) (x) = ntohl(__CAST(uint32_t, (x)))
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#define NTOHS(x) (x) = ntohs(__CAST(uint16_t, (x)))
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#define HTONL(x) (x) = htonl(__CAST(uint32_t, (x)))
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#define HTONS(x) (x) = htons(__CAST(uint16_t, (x)))
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#endif /* LITTLE_ENDIAN || !defined(__lint__) */
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/*
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* Macros to convert to a specific endianness.
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*/
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#if BYTE_ORDER == BIG_ENDIAN
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#define htobe16(x) (x)
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#define htobe32(x) (x)
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#define htobe64(x) (x)
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#define htole16(x) bswap16(__CAST(uint16_t, (x)))
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#define htole32(x) bswap32(__CAST(uint32_t, (x)))
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#define htole64(x) bswap64(__CAST(uint64_t, (x)))
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#define HTOBE16(x) __CAST(void, (x))
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#define HTOBE32(x) __CAST(void, (x))
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#define HTOBE64(x) __CAST(void, (x))
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#define HTOLE16(x) (x) = bswap16(__CAST(uint16_t, (x)))
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#define HTOLE32(x) (x) = bswap32(__CAST(uint32_t, (x)))
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#define HTOLE64(x) (x) = bswap64(__CAST(uint64_t, (x)))
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#else /* LITTLE_ENDIAN */
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#define htobe16(x) bswap16(__CAST(uint16_t, (x)))
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#define htobe32(x) bswap32(__CAST(uint32_t, (x)))
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#define htobe64(x) bswap64(__CAST(uint64_t, (x)))
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#define htole16(x) (x)
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#define htole32(x) (x)
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#define htole64(x) (x)
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#define HTOBE16(x) (x) = bswap16(__CAST(uint16_t, (x)))
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#define HTOBE32(x) (x) = bswap32(__CAST(uint32_t, (x)))
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#define HTOBE64(x) (x) = bswap64(__CAST(uint64_t, (x)))
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#define HTOLE16(x) __CAST(void, (x))
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#define HTOLE32(x) __CAST(void, (x))
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#define HTOLE64(x) __CAST(void, (x))
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#endif /* LITTLE_ENDIAN */
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#define be16toh(x) htobe16(x)
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#define be32toh(x) htobe32(x)
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#define be64toh(x) htobe64(x)
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#define le16toh(x) htole16(x)
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#define le32toh(x) htole32(x)
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#define le64toh(x) htole64(x)
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#define BE16TOH(x) HTOBE16(x)
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#define BE32TOH(x) HTOBE32(x)
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#define BE64TOH(x) HTOBE64(x)
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#define LE16TOH(x) HTOLE16(x)
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#define LE32TOH(x) HTOLE32(x)
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#define LE64TOH(x) HTOLE64(x)
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/*
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* Routines to encode/decode big- and little-endian multi-octet values
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* to/from an octet stream.
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*/
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#if __GNUC_PREREQ__(2, 95)
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#define __GEN_ENDIAN_ENC(bits, endian) \
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static __inline __unused void \
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endian ## bits ## enc(void *dst, uint ## bits ## _t u) \
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{ \
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u = hto ## endian ## bits (u); \
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__builtin_memcpy(dst, &u, sizeof(u)); \
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}
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__GEN_ENDIAN_ENC(16, be)
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__GEN_ENDIAN_ENC(32, be)
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__GEN_ENDIAN_ENC(64, be)
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__GEN_ENDIAN_ENC(16, le)
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__GEN_ENDIAN_ENC(32, le)
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__GEN_ENDIAN_ENC(64, le)
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#undef __GEN_ENDIAN_ENC
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#define __GEN_ENDIAN_DEC(bits, endian) \
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static __inline __unused uint ## bits ## _t \
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endian ## bits ## dec(const void *buf) \
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{ \
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uint ## bits ## _t u; \
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__builtin_memcpy(&u, buf, sizeof(u)); \
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return endian ## bits ## toh (u); \
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}
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__GEN_ENDIAN_DEC(16, be)
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__GEN_ENDIAN_DEC(32, be)
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__GEN_ENDIAN_DEC(64, be)
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__GEN_ENDIAN_DEC(16, le)
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__GEN_ENDIAN_DEC(32, le)
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__GEN_ENDIAN_DEC(64, le)
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#undef __GEN_ENDIAN_DEC
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#else /* !(GCC >= 2.95) */
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static __inline void __unused
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be16enc(void *buf, uint16_t u)
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{
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uint8_t *p = __CAST(uint8_t *, buf);
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p[0] = __CAST(uint8_t, ((__CAST(unsigned, u) >> 8) & 0xff));
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p[1] = __CAST(uint8_t, (u & 0xff));
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}
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static __inline void __unused
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le16enc(void *buf, uint16_t u)
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{
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uint8_t *p = __CAST(uint8_t *, buf);
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p[0] = __CAST(uint8_t, (u & 0xff));
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p[1] = __CAST(uint8_t, ((__CAST(unsigned, u) >> 8) & 0xff));
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}
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static __inline uint16_t __unused
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be16dec(const void *buf)
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{
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const uint8_t *p = __CAST(const uint8_t *, buf);
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return __CAST(uint16_t, ((p[0] << 8) | p[1]));
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}
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static __inline uint16_t __unused
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le16dec(const void *buf)
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{
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const uint8_t *p = __CAST(const uint8_t *, buf);
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return __CAST(uint16_t, ((p[1] << 8) | p[0]));
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}
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static __inline void __unused
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be32enc(void *buf, uint32_t u)
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{
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uint8_t *p = __CAST(uint8_t *, buf);
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p[0] = __CAST(uint8_t, ((u >> 24) & 0xff));
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p[1] = __CAST(uint8_t, ((u >> 16) & 0xff));
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p[2] = __CAST(uint8_t, ((u >> 8) & 0xff));
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p[3] = __CAST(uint8_t, (u & 0xff));
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}
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static __inline void __unused
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le32enc(void *buf, uint32_t u)
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{
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uint8_t *p = __CAST(uint8_t *, buf);
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p[0] = __CAST(uint8_t, (u & 0xff));
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p[1] = __CAST(uint8_t, ((u >> 8) & 0xff));
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p[2] = __CAST(uint8_t, ((u >> 16) & 0xff));
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p[3] = __CAST(uint8_t, ((u >> 24) & 0xff));
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}
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static __inline uint32_t __unused
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be32dec(const void *buf)
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{
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const uint8_t *p = __CAST(const uint8_t *, buf);
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return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
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}
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static __inline uint32_t __unused
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le32dec(const void *buf)
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{
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const uint8_t *p = __CAST(const uint8_t *, buf);
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return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
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}
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static __inline void __unused
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be64enc(void *buf, uint64_t u)
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{
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uint8_t *p = __CAST(uint8_t *, buf);
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be32enc(p, __CAST(uint32_t, (u >> 32)));
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be32enc(p + 4, __CAST(uint32_t, (u & 0xffffffffULL)));
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}
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static __inline void __unused
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le64enc(void *buf, uint64_t u)
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{
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uint8_t *p = __CAST(uint8_t *, buf);
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le32enc(p, __CAST(uint32_t, (u & 0xffffffffULL)));
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le32enc(p + 4, __CAST(uint32_t, (u >> 32)));
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}
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static __inline uint64_t __unused
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be64dec(const void *buf)
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{
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const uint8_t *p = (const uint8_t *)buf;
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return ((__CAST(uint64_t, be32dec(p)) << 32) | be32dec(p + 4));
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}
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static __inline uint64_t __unused
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le64dec(const void *buf)
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{
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const uint8_t *p = (const uint8_t *)buf;
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return (le32dec(p) | (__CAST(uint64_t, le32dec(p + 4)) << 32));
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}
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#endif /* GCC >= 2.95 */
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#endif /* !_LOCORE */
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#endif /* _XOPEN_SOURCE || _NETBSD_SOURCE */
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#endif /* !_SYS_ENDIAN_H_ */
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