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/* Interface to byteswapping functions.
Copyright (C) 2006-2020 Free Software Foundation, Inc.
This file is part of libctf.
libctf 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 3, 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; see the file COPYING. If not see
<http://www.gnu.org/licenses/>. */
#ifndef _CTF_SWAP_H
#define _CTF_SWAP_H
#include "config.h"
#include <stdint.h>
#ifdef HAVE_BYTESWAP_H
#include <byteswap.h>
#endif /* defined(HAVE_BYTESWAP_H) */
#ifndef __DJGPP__
/* Provide our own versions of the byteswap functions. */
#if !HAVE_DECL_BSWAP_16
static inline uint16_t
bswap_16 (uint16_t v)
{
return ((v >> 8) & 0xff) | ((v & 0xff) << 8);
}
#endif /* !HAVE_DECL_BSWAP16 */
#if !HAVE_DECL_BSWAP_32
static inline uint32_t
bswap_32 (uint32_t v)
{
return ( ((v & 0xff000000) >> 24)
| ((v & 0x00ff0000) >> 8)
| ((v & 0x0000ff00) << 8)
| ((v & 0x000000ff) << 24));
}
#endif /* !HAVE_DECL_BSWAP32 */
#if !HAVE_DECL_BSWAP_64
static inline uint64_t
bswap_64 (uint64_t v)
{
return ( ((v & 0xff00000000000000ULL) >> 56)
| ((v & 0x00ff000000000000ULL) >> 40)
| ((v & 0x0000ff0000000000ULL) >> 24)
| ((v & 0x000000ff00000000ULL) >> 8)
| ((v & 0x00000000ff000000ULL) << 8)
| ((v & 0x0000000000ff0000ULL) << 24)
| ((v & 0x000000000000ff00ULL) << 40)
| ((v & 0x00000000000000ffULL) << 56));
}
#endif /* !HAVE_DECL_BSWAP64 */
#else /* __DJGPP__ */
/* The inline functions make trouble with diferent versions of gcc thus use macros. */
# if defined (__GNUC__) && (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
# define __gnuc_extension__ __extension__
# else
# define __gnuc_extension__
# endif
# define bswap_identity_64(v) \
(__gnuc_extension__ \
({ \
uint64_t value = (v); \
value; \
}) \
)
# define bswap_16(v) \
(__gnuc_extension__ \
({ \
uint16_t _v = (v); \
uint16_t value = ( ((_v >> 8) & 0xFF) \
| ((_v & 0xFF) << 8)); \
value; \
}) \
)
# define bswap_32(v) \
(__gnuc_extension__ \
({ \
uint32_t _v = (v); \
uint32_t value = ( ((_v & 0xFF000000) >> 24) \
| ((_v & 0x00FF0000) >> 8) \
| ((_v & 0x0000FF00) << 8) \
| ((_v & 0x000000FF) << 24)); \
value; \
}) \
)
# define bswap_64(v) \
(__gnuc_extension__ \
({ \
uint64_t _v = (v); \
uint64_t value = ( ((_v & 0xFF00000000000000ULL) >> 56) \
| ((_v & 0x00FF000000000000ULL) >> 40) \
| ((_v & 0x0000FF0000000000ULL) >> 24) \
| ((_v & 0x000000FF00000000ULL) >> 8) \
| ((_v & 0x00000000FF000000ULL) << 8) \
| ((_v & 0x0000000000FF0000ULL) << 24) \
| ((_v & 0x000000000000FF00ULL) << 40) \
| ((_v & 0x00000000000000FFULL) << 56)); \
value; \
}) \
)
#endif /* __DJGPP__ */
#endif /* !defined(_CTF_SWAP_H) */
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