1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2002 Thomas Moestl <[email protected]>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #ifndef _SYS_ENDIAN_H_
30 #define _SYS_ENDIAN_H_
31
32 #include <sys/cdefs.h>
33 #include <sys/_types.h>
34 #include <machine/endian.h>
35
36 #ifndef _UINT8_T_DECLARED
37 typedef __uint8_t uint8_t;
38 #define _UINT8_T_DECLARED
39 #endif
40
41 #ifndef _UINT16_T_DECLARED
42 typedef __uint16_t uint16_t;
43 #define _UINT16_T_DECLARED
44 #endif
45
46 #ifndef _UINT32_T_DECLARED
47 typedef __uint32_t uint32_t;
48 #define _UINT32_T_DECLARED
49 #endif
50
51 #ifndef _UINT64_T_DECLARED
52 typedef __uint64_t uint64_t;
53 #define _UINT64_T_DECLARED
54 #endif
55
56 /*
57 * Note: While tempting to try to avoid namespace pollution from this file,
58 * several software packages assume these marcos are defined, even when it
59 * defines _POSIX_C_SOURCE to request an unpolluted namespace.
60 */
61
62 /*
63 * General byte order swapping functions.
64 */
65 #define bswap16(x) __bswap16(x)
66 #define bswap32(x) __bswap32(x)
67 #define bswap64(x) __bswap64(x)
68
69 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
70 static __inline uint16_t
be16dec(const void * pp)71 be16dec(const void *pp)
72 {
73 uint8_t const *p = (uint8_t const *)pp;
74
75 return ((p[0] << 8) | p[1]);
76 }
77
78 static __inline uint32_t
be32dec(const void * pp)79 be32dec(const void *pp)
80 {
81 uint8_t const *p = (uint8_t const *)pp;
82
83 return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
84 }
85
86 static __inline uint64_t
be64dec(const void * pp)87 be64dec(const void *pp)
88 {
89 uint8_t const *p = (uint8_t const *)pp;
90
91 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
92 }
93
94 static __inline uint16_t
le16dec(const void * pp)95 le16dec(const void *pp)
96 {
97 uint8_t const *p = (uint8_t const *)pp;
98
99 return ((p[1] << 8) | p[0]);
100 }
101
102 static __inline uint32_t
le32dec(const void * pp)103 le32dec(const void *pp)
104 {
105 uint8_t const *p = (uint8_t const *)pp;
106
107 return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
108 }
109
110 static __inline uint64_t
le64dec(const void * pp)111 le64dec(const void *pp)
112 {
113 uint8_t const *p = (uint8_t const *)pp;
114
115 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
116 }
117
118 static __inline void
be16enc(void * pp,uint16_t u)119 be16enc(void *pp, uint16_t u)
120 {
121 uint8_t *p = (uint8_t *)pp;
122
123 p[0] = (u >> 8) & 0xff;
124 p[1] = u & 0xff;
125 }
126
127 static __inline void
be32enc(void * pp,uint32_t u)128 be32enc(void *pp, uint32_t u)
129 {
130 uint8_t *p = (uint8_t *)pp;
131
132 p[0] = (u >> 24) & 0xff;
133 p[1] = (u >> 16) & 0xff;
134 p[2] = (u >> 8) & 0xff;
135 p[3] = u & 0xff;
136 }
137
138 static __inline void
be64enc(void * pp,uint64_t u)139 be64enc(void *pp, uint64_t u)
140 {
141 uint8_t *p = (uint8_t *)pp;
142
143 be32enc(p, (uint32_t)(u >> 32));
144 be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
145 }
146
147 static __inline void
le16enc(void * pp,uint16_t u)148 le16enc(void *pp, uint16_t u)
149 {
150 uint8_t *p = (uint8_t *)pp;
151
152 p[0] = u & 0xff;
153 p[1] = (u >> 8) & 0xff;
154 }
155
156 static __inline void
le32enc(void * pp,uint32_t u)157 le32enc(void *pp, uint32_t u)
158 {
159 uint8_t *p = (uint8_t *)pp;
160
161 p[0] = u & 0xff;
162 p[1] = (u >> 8) & 0xff;
163 p[2] = (u >> 16) & 0xff;
164 p[3] = (u >> 24) & 0xff;
165 }
166
167 static __inline void
le64enc(void * pp,uint64_t u)168 le64enc(void *pp, uint64_t u)
169 {
170 uint8_t *p = (uint8_t *)pp;
171
172 le32enc(p, (uint32_t)(u & 0xffffffffU));
173 le32enc(p + 4, (uint32_t)(u >> 32));
174 }
175 #endif /* _SYS_ENDIAN_H_ */
176