FreeBSD/Linux Kernel Cross Reference
sys/sys/endian.h
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
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 * $FreeBSD$
29 */
30
31 #ifndef _SYS_ENDIAN_H_
32 #define _SYS_ENDIAN_H_
33
34 #include <sys/cdefs.h>
35 #include <sys/_types.h>
36 #include <machine/endian.h>
37
38 #ifndef _UINT8_T_DECLARED
39 typedef __uint8_t uint8_t;
40 #define _UINT8_T_DECLARED
41 #endif
42
43 #ifndef _UINT16_T_DECLARED
44 typedef __uint16_t uint16_t;
45 #define _UINT16_T_DECLARED
46 #endif
47
48 #ifndef _UINT32_T_DECLARED
49 typedef __uint32_t uint32_t;
50 #define _UINT32_T_DECLARED
51 #endif
52
53 #ifndef _UINT64_T_DECLARED
54 typedef __uint64_t uint64_t;
55 #define _UINT64_T_DECLARED
56 #endif
57
58 /*
59 * Note: While tempting to try to avoid namespace pollution from this file,
60 * several software packages assume these marcos are defined, even when it
61 * defines _POSIX_C_SOURCE to request an unpolluted namespace.
62 */
63
64 /*
65 * General byte order swapping functions.
66 */
67 #define bswap16(x) __bswap16(x)
68 #define bswap32(x) __bswap32(x)
69 #define bswap64(x) __bswap64(x)
70
71 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
72 static __inline uint16_t
73 be16dec(const void *pp)
74 {
75 uint8_t const *p = (uint8_t const *)pp;
76
77 return ((p[0] << 8) | p[1]);
78 }
79
80 static __inline uint32_t
81 be32dec(const void *pp)
82 {
83 uint8_t const *p = (uint8_t const *)pp;
84
85 return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
86 }
87
88 static __inline uint64_t
89 be64dec(const void *pp)
90 {
91 uint8_t const *p = (uint8_t const *)pp;
92
93 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
94 }
95
96 static __inline uint16_t
97 le16dec(const void *pp)
98 {
99 uint8_t const *p = (uint8_t const *)pp;
100
101 return ((p[1] << 8) | p[0]);
102 }
103
104 static __inline uint32_t
105 le32dec(const void *pp)
106 {
107 uint8_t const *p = (uint8_t const *)pp;
108
109 return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
110 }
111
112 static __inline uint64_t
113 le64dec(const void *pp)
114 {
115 uint8_t const *p = (uint8_t const *)pp;
116
117 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
118 }
119
120 static __inline void
121 be16enc(void *pp, uint16_t u)
122 {
123 uint8_t *p = (uint8_t *)pp;
124
125 p[0] = (u >> 8) & 0xff;
126 p[1] = u & 0xff;
127 }
128
129 static __inline void
130 be32enc(void *pp, uint32_t u)
131 {
132 uint8_t *p = (uint8_t *)pp;
133
134 p[0] = (u >> 24) & 0xff;
135 p[1] = (u >> 16) & 0xff;
136 p[2] = (u >> 8) & 0xff;
137 p[3] = u & 0xff;
138 }
139
140 static __inline void
141 be64enc(void *pp, uint64_t u)
142 {
143 uint8_t *p = (uint8_t *)pp;
144
145 be32enc(p, (uint32_t)(u >> 32));
146 be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
147 }
148
149 static __inline void
150 le16enc(void *pp, uint16_t u)
151 {
152 uint8_t *p = (uint8_t *)pp;
153
154 p[0] = u & 0xff;
155 p[1] = (u >> 8) & 0xff;
156 }
157
158 static __inline void
159 le32enc(void *pp, uint32_t u)
160 {
161 uint8_t *p = (uint8_t *)pp;
162
163 p[0] = u & 0xff;
164 p[1] = (u >> 8) & 0xff;
165 p[2] = (u >> 16) & 0xff;
166 p[3] = (u >> 24) & 0xff;
167 }
168
169 static __inline void
170 le64enc(void *pp, uint64_t u)
171 {
172 uint8_t *p = (uint8_t *)pp;
173
174 le32enc(p, (uint32_t)(u & 0xffffffffU));
175 le32enc(p + 4, (uint32_t)(u >> 32));
176 }
177 #endif /* _SYS_ENDIAN_H_ */
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