bswap.h
1 /*
2  * Copyright (C) 2000, 2001 Billy Biggs <vektor@dumbterm.net>,
3  * HÃ¥kan Hjort <d95hjort@dtek.chalmers.se>
4  *
5  * This file is part of libdvdread.
6  *
7  * libdvdread is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * libdvdread is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License along
18  * with libdvdread; if not, write to the Free Software Foundation, Inc.,
19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20  */
21 
22 #ifndef LIBDVDREAD_BSWAP_H
23 #define LIBDVDREAD_BSWAP_H
24 
25 #include <config.h>
26 
27 #if defined(WORDS_BIGENDIAN)
28 /* All bigendian systems are fine, just ignore the swaps. */
29 #define B2N_16(x) (void)(x)
30 #define B2N_32(x) (void)(x)
31 #define B2N_64(x) (void)(x)
32 
33 #else
34 
35 /* For __FreeBSD_version */
36 #if defined(HAVE_SYS_PARAM_H)
37 #include <sys/param.h>
38 #endif
39 
40 #if defined(__linux__) || defined(__GLIBC__)
41 #include <byteswap.h>
42 #define B2N_16(x) x = bswap_16(x)
43 #define B2N_32(x) x = bswap_32(x)
44 #define B2N_64(x) x = bswap_64(x)
45 
46 #elif defined(__APPLE__)
47 #include <libkern/OSByteOrder.h>
48 #define B2N_16(x) x = OSSwapBigToHostInt16(x)
49 #define B2N_32(x) x = OSSwapBigToHostInt32(x)
50 #define B2N_64(x) x = OSSwapBigToHostInt64(x)
51 
52 #elif defined(__NetBSD__)
53 #include <sys/endian.h>
54 #define B2N_16(x) BE16TOH(x)
55 #define B2N_32(x) BE32TOH(x)
56 #define B2N_64(x) BE64TOH(x)
57 
58 #elif defined(__OpenBSD__)
59 #include <sys/endian.h>
60 #define B2N_16(x) x = swap16(x)
61 #define B2N_32(x) x = swap32(x)
62 #define B2N_64(x) x = swap64(x)
63 
64 #elif defined(__FreeBSD__) && __FreeBSD_version >= 470000
65 #include <sys/endian.h>
66 #define B2N_16(x) x = be16toh(x)
67 #define B2N_32(x) x = be32toh(x)
68 #define B2N_64(x) x = be64toh(x)
69 
70 #elif defined(__QNXNTO__)
71 #include <gulliver.h>
72 #define B2N_16(x) x = ENDIAN_RET16(x)
73 #define B2N_32(x) x = ENDIAN_RET32(x)
74 #define B2N_64(x) x = ENDIAN_RET64(x)
75 
76 /* This is a slow but portable implementation, it has multiple evaluation
77  * problems so beware.
78  * Old FreeBSD's and Solaris don't have <byteswap.h> or any other such
79  * functionality!
80  */
81 
82 #elif defined(__FreeBSD__) || defined(__sun) || defined(__bsdi__) || defined(WIN32) || defined(__CYGWIN__) || defined(__BEOS__) || defined(__OS2__)
83 #define B2N_16(x) \
84  x = ((((x) & 0xff00) >> 8) | \
85  (((x) & 0x00ff) << 8))
86 #define B2N_32(x) \
87  x = ((((x) & 0xff000000) >> 24) | \
88  (((x) & 0x00ff0000) >> 8) | \
89  (((x) & 0x0000ff00) << 8) | \
90  (((x) & 0x000000ff) << 24))
91 #define B2N_64(x) \
92  x = ((((x) & 0xff00000000000000ULL) >> 56) | \
93  (((x) & 0x00ff000000000000ULL) >> 40) | \
94  (((x) & 0x0000ff0000000000ULL) >> 24) | \
95  (((x) & 0x000000ff00000000ULL) >> 8) | \
96  (((x) & 0x00000000ff000000ULL) << 8) | \
97  (((x) & 0x0000000000ff0000ULL) << 24) | \
98  (((x) & 0x000000000000ff00ULL) << 40) | \
99  (((x) & 0x00000000000000ffULL) << 56))
100 
101 #else
102 
103 /* If there isn't a header provided with your system with this functionality
104  * add the relevant || define( ) to the portable implementation above.
105  */
106 #error "You need to add endian swap macros for you're system"
107 
108 #endif
109 
110 #endif /* WORDS_BIGENDIAN */
111 
112 #endif /* LIBDVDREAD_BSWAP_H */