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- /* Interface to byteswapping functions.
- Copyright (C) 2006-2022 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>
- #include <assert.h>
- #ifdef HAVE_BYTESWAP_H
- #include <byteswap.h>
- #endif /* defined(HAVE_BYTESWAP_H) */
- /* 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 */
- /* < C11? define away static assertions. */
- #if !defined (__STDC_VERSION__) || __STDC_VERSION__ < 201112L
- #define _Static_assert(cond, err)
- #endif
- /* Swap the endianness of something. */
- #define swap_thing(x) \
- do \
- { \
- _Static_assert (sizeof (x) == 1 || (sizeof (x) % 2 == 0 \
- && sizeof (x) <= 8), \
- "Invalid size, update endianness code"); \
- switch (sizeof (x)) { \
- case 2: x = bswap_16 (x); break; \
- case 4: x = bswap_32 (x); break; \
- case 8: x = bswap_64 (x); break; \
- case 1: /* Nothing needs doing */ \
- break; \
- } \
- } \
- while (0);
- #endif /* !defined(_CTF_SWAP_H) */
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