1 /* Interface to byteswapping functions. 2 Copyright (C) 2006-2020 Free Software Foundation, Inc. 3 4 This file is part of libctf. 5 6 libctf is free software; you can redistribute it and/or modify it under 7 the terms of the GNU General Public License as published by the Free 8 Software Foundation; either version 3, or (at your option) any later 9 version. 10 11 This program is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 14 See the GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; see the file COPYING. If not see 18 <http://www.gnu.org/licenses/>. */ 19 20 #ifndef _CTF_SWAP_H 21 #define _CTF_SWAP_H 22 23 #include "config.h" 24 #include <stdint.h> 25 26 #ifdef HAVE_BYTESWAP_H 27 #include <byteswap.h> 28 #else 29 30 /* Provide our own versions of the byteswap functions. */ 31 static inline uint16_t 32 bswap_16 (uint16_t v) 33 { 34 return ((v >> 8) & 0xff) | ((v & 0xff) << 8); 35 } 36 37 static inline uint32_t 38 bswap_32 (uint32_t v) 39 { 40 return ( ((v & 0xff000000) >> 24) 41 | ((v & 0x00ff0000) >> 8) 42 | ((v & 0x0000ff00) << 8) 43 | ((v & 0x000000ff) << 24)); 44 } 45 46 inline uint64_t 47 bswap_identity_64 (uint64_t v) 48 { 49 return v; 50 } 51 52 static inline uint64_t 53 bswap_64 (uint64_t v) 54 { 55 return ( ((v & 0xff00000000000000ULL) >> 56) 56 | ((v & 0x00ff000000000000ULL) >> 40) 57 | ((v & 0x0000ff0000000000ULL) >> 24) 58 | ((v & 0x000000ff00000000ULL) >> 8) 59 | ((v & 0x00000000ff000000ULL) << 8) 60 | ((v & 0x0000000000ff0000ULL) << 24) 61 | ((v & 0x000000000000ff00ULL) << 40) 62 | ((v & 0x00000000000000ffULL) << 56)); 63 } 64 #endif /* !defined(HAVE_BYTESWAP_H) */ 65 66 #endif /* !defined(_CTF_SWAP_H) */ 67