| /* Interface to byteswapping functions. |
| Copyright (C) 2006-2021 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) */ |