1 /*-
2 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
3 * Copyright (c) 2005 Robert N. M. Watson
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * Derived from FreeBSD src/sys/sys/endian.h:1.6.
28 */
29
30 #ifndef _COMPAT_ENDIAN_H_
31 #define _COMPAT_ENDIAN_H_
32
33 /*
34 * Some systems will have the uint/int types defined here already, others
35 * will need stdint.h.
36 */
37 #ifdef HAVE_STDINT_H
38 #include <stdint.h>
39 #endif
40
41 /*
42 * Some operating systems do not yet have the more recent endian APIs that
43 * permit encoding to and decoding from byte streams. For those systems, we
44 * implement local non-optimized versions.
45 */
46
47 static __inline uint16_t
bswap16(uint16_t int16)48 bswap16(uint16_t int16)
49 {
50 const unsigned char *from;
51 unsigned char *to;
52 uint16_t t;
53
54 from = (const unsigned char *) &int16;
55 to = (unsigned char *) &t;
56
57 to[0] = from[1];
58 to[1] = from[0];
59
60 return (t);
61 }
62
63 static __inline uint32_t
bswap32(uint32_t int32)64 bswap32(uint32_t int32)
65 {
66 const unsigned char *from;
67 unsigned char *to;
68 uint32_t t;
69
70 from = (const unsigned char *) &int32;
71 to = (unsigned char *) &t;
72
73 to[0] = from[3];
74 to[1] = from[2];
75 to[2] = from[1];
76 to[3] = from[0];
77
78 return (t);
79 }
80
81 static __inline uint64_t
bswap64(uint64_t int64)82 bswap64(uint64_t int64)
83 {
84 const unsigned char *from;
85 unsigned char *to;
86 uint64_t t;
87
88 from = (const unsigned char *) &int64;
89 to = (unsigned char *) &t;
90
91 to[0] = from[7];
92 to[1] = from[6];
93 to[2] = from[5];
94 to[3] = from[4];
95 to[4] = from[3];
96 to[5] = from[2];
97 to[6] = from[1];
98 to[7] = from[0];
99
100 return (t);
101 }
102
103 #if defined(BYTE_ORDER) && !defined(_BYTE_ORDER)
104 #define _BYTE_ORDER BYTE_ORDER
105 #endif
106 #if !defined(_BYTE_ORDER)
107 #error "Neither BYTE_ORDER nor _BYTE_ORDER defined"
108 #endif
109
110 #if defined(BIG_ENDIAN) && !defined(_BIG_ENDIAN)
111 #define _BIG_ENDIAN BIG_ENDIAN
112 #endif
113
114 #if defined(LITTLE_ENDIAN) && !defined(_LITTLE_ENDIAN)
115 #define _LITTLE_ENDIAN LITTLE_ENDIAN
116 #endif
117
118 /* XXX: Hack. */
119 #ifndef htobe16
120 /*
121 * Host to big endian, host to little endian, big endian to host, and little
122 * endian to host byte order functions as detailed in byteorder(9).
123 */
124 #if _BYTE_ORDER == _LITTLE_ENDIAN
125 #define htobe16(x) bswap16((x))
126 #define htobe32(x) bswap32((x))
127 #define htobe64(x) bswap64((x))
128 #define htole16(x) ((uint16_t)(x))
129 #define htole32(x) ((uint32_t)(x))
130 #define htole64(x) ((uint64_t)(x))
131
132 #define be16toh(x) bswap16((x))
133 #define be32toh(x) bswap32((x))
134 #define be64toh(x) bswap64((x))
135 #define le16toh(x) ((uint16_t)(x))
136 #define le32toh(x) ((uint32_t)(x))
137 #define le64toh(x) ((uint64_t)(x))
138 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */
139 #define htobe16(x) ((uint16_t)(x))
140 #define htobe32(x) ((uint32_t)(x))
141 #define htobe64(x) ((uint64_t)(x))
142 #define htole16(x) bswap16((x))
143 #define htole32(x) bswap32((x))
144 #define htole64(x) bswap64((x))
145
146 #define be16toh(x) ((uint16_t)(x))
147 #define be32toh(x) ((uint32_t)(x))
148 #define be64toh(x) ((uint64_t)(x))
149 #define le16toh(x) bswap16((x))
150 #define le32toh(x) bswap32((x))
151 #define le64toh(x) bswap64((x))
152 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
153 #endif
154
155 #endif /* _COMPAT_ENDIAN_H_ */
156