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#endif /* defined(HAVE_BYTESWAP_H) */
29
30/* Provide our own versions of the byteswap functions.  */
31
32#if !HAVE_DECL_BSWAP_16
33static inline uint16_t
34bswap_16 (uint16_t v)
35{
36  return ((v >> 8) & 0xff) | ((v & 0xff) << 8);
37}
38#endif /* !HAVE_DECL_BSWAP16 */
39
40#if !HAVE_DECL_BSWAP_32
41static inline uint32_t
42bswap_32 (uint32_t v)
43{
44  return (  ((v & 0xff000000) >> 24)
45	  | ((v & 0x00ff0000) >>  8)
46	  | ((v & 0x0000ff00) <<  8)
47	  | ((v & 0x000000ff) << 24));
48}
49#endif /* !HAVE_DECL_BSWAP32 */
50
51#if !HAVE_DECL_BSWAP_64
52static inline uint64_t
53bswap_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 /* !HAVE_DECL_BSWAP64 */
65
66#endif /* !defined(_CTF_SWAP_H) */
67