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/*
* AUTHOR: Alan Barrett
*
* SQUID Web Proxy Cache http://www.squid-cache.org/
* ----------------------------------------------------------
*
* Squid is the result of efforts by numerous individuals from
* the Internet community; see the CONTRIBUTORS file for full
* details. Many organizations have provided support for Squid's
* development; see the SPONSORS file for full details. Squid is
* Copyrighted (C) 2001 by the Regents of the University of
* California; see the COPYRIGHT file for full details. Squid
* incorporates software developed and/or copyrighted by other
* sources; see the CREDITS file for full details.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
*/
#ifndef SQUID_ENDIAN_H
#define SQUID_ENDIAN_H
/*
* Macros to deal with byte swapping. These macros provide
* the following interface:
*
* // Byte-swap
* uint16_t bswap16(uint16_t);
* uint32_t bswap32(uint32_t);
*
* // Convert from host byte order to big-endian, and vice versa.
* uint16_t htobe16(uint16_t); // equivalent to htons()
* uint32_t htobe32(uint32_t); // equivalent to htonl()
* uint16_t be16toh(uint16_t); // equivalent to ntohs()
* uint32_t be32toh(uint32_t); // equivalent to ntohs()
*
* // Convert from host byte order to little-endian, and vice versa.
* uint16_t htole16(uint16_t);
* uint32_t htole32(uint32_t);
* uint16_t le16toh(uint16_t);
* uint32_t le32toh(uint32_t);
*/
/*
* Some systems define bswap_16() and bswap_32() in <byteswap.h>
*
* Some systems define bswap16() and bswap32() in <sys/bswap.h>.
*
* Some systems define htobe16()/be16toh() and friends in <sys/endian.h>.
*/
#if HAVE_BYTESWAP_H
# include <byteswap.h>
#endif /* HAVE_BYTESWAP_H */
#if HAVE_MACHINE_BYTE_SWAP_H
# include <machine/byte_swap.h>
#endif /* HAVE_MACHINE_BYTE_SWAP_H */
#if HAVE_SYS_BSWAP_H
# include <sys/bswap.h>
#endif /* HAVE_SYS_BSWAP_H */
#if HAVE_SYS_ENDIAN_H
# include <sys/endian.h>
#endif /* HAVE_SYS_ENDIAN_H */
/*
* Define bswap16() and bswap32() in terms of bswap_16() and bswap_32(),
* or the hard way.
*/
#if ! HAVE_BSWAP16 && ! defined(bswap16)
# if defined(bswap_16)
# define bswap16(x) bswap_16(x)
# else
# define bswap16(x) \
(((((uint16_t)(x)) >> 8) & 0xff) | ((((uint16_t)(x)) & 0xff) << 8))
# endif
#endif /* ! HAVE_BSWAP16 && ! defined(bswap16) */
#if ! HAVE_BSWAP32 && ! defined(bswap32)
# if defined(bswap_32)
# define bswap32(x) bswap_32(x)
# else
# define bswap32(x) \
(((((uint32_t)(x)) & 0xff000000) >> 24) | \
((((uint32_t)(x)) & 0x00ff0000) >> 8) | \
((((uint32_t)(x)) & 0x0000ff00) << 8) | \
((((uint32_t)(x)) & 0x000000ff) << 24))
# endif
#endif /* ! HAVE_BSWAP32 && ! defined(bswap32) */
/*
* Define htobe*()/be*toh() in terms of hton*()/ntoh*().
*
* XXX: If htobe16() is missing, we assume that the other *be*() functions
* are also missing.
*/
#if ! HAVE_HTOBE16 && ! defined(htobe16)
# ifdef WORDS_BIGENDIAN
# define htobe16(x) (x)
# define htobe32(x) (x)
# define be16toh(x) (x)
# define be32toh(x) (x)
# else /* ! WORDS_BIGENDIAN */
# define htobe16(x) htons(x)
# define htobe32(x) htonl(x)
# define be16toh(x) ntohs(x)
# define be32toh(x) ntohl(x)
# endif /* ! WORDS_BIGENDIAN */
#endif /* ! HAVE_HTOBE16 && ! defined(htobe16) */
/*
* Define htole*()/le*toh() in terms of bswap*().
*
* XXX: If htole16() is missing, we assume that the other *le*() functions
* are also missing.
*
* Except OpenBSD - htole16 & 32 exist, but not le16toh etc
*/
#if _SQUID_OPENBSD_
# define le16toh(x) htole16(x)
# define le32toh(x) htole32(x)
#endif
#if ! HAVE_HTOLE16 && ! defined(htole16)
# ifdef WORDS_BIGENDIAN
# define htole16(x) bswap16(x)
# define htole32(x) bswap32(x)
# define le16toh(x) bswap16(x)
# define le32toh(x) bswap32(x)
# else /* ! WORDS_BIGENDIAN */
/*
* XXX: What about unusual byte orders like 3412 or 2143 ?
* Nothing else in squid seems to care about them,
* so we don't worry about them here either.
*/
# define htole16(x) (x)
# define htole32(x) (x)
# define le16toh(x) (x)
# define le32toh(x) (x)
# endif /* ! WORDS_BIGENDIAN */
#endif /* ! HAVE_HTOLE16 && ! defined(htole16) */
#endif /* SQUID_ENDIAN_H */
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