92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
/* Interface to byteswapping functions.
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Copyright (C) 2006-2022 Free Software Foundation, Inc.
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This file is part of libctf.
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libctf is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef _CTF_SWAP_H
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#define _CTF_SWAP_H
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#include "config.h"
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#include <stdint.h>
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#include <assert.h>
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#ifdef HAVE_BYTESWAP_H
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#include <byteswap.h>
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#endif /* defined(HAVE_BYTESWAP_H) */
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/* Provide our own versions of the byteswap functions. */
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#if !HAVE_DECL_BSWAP_16
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static inline uint16_t
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bswap_16 (uint16_t v)
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{
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return ((v >> 8) & 0xff) | ((v & 0xff) << 8);
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}
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#endif /* !HAVE_DECL_BSWAP16 */
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#if !HAVE_DECL_BSWAP_32
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static inline uint32_t
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bswap_32 (uint32_t v)
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{
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return ( ((v & 0xff000000) >> 24)
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| ((v & 0x00ff0000) >> 8)
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| ((v & 0x0000ff00) << 8)
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| ((v & 0x000000ff) << 24));
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}
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#endif /* !HAVE_DECL_BSWAP32 */
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#if !HAVE_DECL_BSWAP_64
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static inline uint64_t
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bswap_64 (uint64_t v)
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{
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return ( ((v & 0xff00000000000000ULL) >> 56)
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| ((v & 0x00ff000000000000ULL) >> 40)
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| ((v & 0x0000ff0000000000ULL) >> 24)
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| ((v & 0x000000ff00000000ULL) >> 8)
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| ((v & 0x00000000ff000000ULL) << 8)
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| ((v & 0x0000000000ff0000ULL) << 24)
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| ((v & 0x000000000000ff00ULL) << 40)
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| ((v & 0x00000000000000ffULL) << 56));
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}
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#endif /* !HAVE_DECL_BSWAP64 */
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/* < C11? define away static assertions. */
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#if !defined (__STDC_VERSION__) || __STDC_VERSION__ < 201112L
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#define _Static_assert(cond, err)
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#endif
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/* Swap the endianness of something. */
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#define swap_thing(x) \
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do \
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{ \
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_Static_assert (sizeof (x) == 1 || (sizeof (x) % 2 == 0 \
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&& sizeof (x) <= 8), \
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"Invalid size, update endianness code"); \
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switch (sizeof (x)) { \
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case 2: x = bswap_16 (x); break; \
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case 4: x = bswap_32 (x); break; \
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case 8: x = bswap_64 (x); break; \
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case 1: /* Nothing needs doing */ \
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break; \
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} \
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} \
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while (0);
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#endif /* !defined(_CTF_SWAP_H) */
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