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 * General byte order swapping functions.
60 */
61 #define bswap16(x) __bswap16(x)
62 #define bswap32(x) __bswap32(x)
63 #define bswap64(x) __bswap64(x)
64
65 /*
66 * Host to big endian, host to little endian, big endian to host, and little
67 * endian to host byte order functions as detailed in byteorder(9).
68 */
69 #if _BYTE_ORDER == _LITTLE_ENDIAN
70 #define htobe16(x) bswap16((x))
71 #define htobe32(x) bswap32((x))
72 #define htobe64(x) bswap64((x))
73 #define htole16(x) ((uint16_t)(x))
74 #define htole32(x) ((uint32_t)(x))
75 #define htole64(x) ((uint64_t)(x))
76
77 #define be16toh(x) bswap16((x))
78 #define be32toh(x) bswap32((x))
79 #define be64toh(x) bswap64((x))
80 #define le16toh(x) ((uint16_t)(x))
81 #define le32toh(x) ((uint32_t)(x))
82 #define le64toh(x) ((uint64_t)(x))
83 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */
84 #define htobe16(x) ((uint16_t)(x))
85 #define htobe32(x) ((uint32_t)(x))
86 #define htobe64(x) ((uint64_t)(x))
87 #define htole16(x) bswap16((x))
88 #define htole32(x) bswap32((x))
89 #define htole64(x) bswap64((x))
90
91 #define be16toh(x) ((uint16_t)(x))
92 #define be32toh(x) ((uint32_t)(x))
93 #define be64toh(x) ((uint64_t)(x))
94 #define le16toh(x) bswap16((x))
95 #define le32toh(x) bswap32((x))
96 #define le64toh(x) bswap64((x))
97 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
98
99 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
100
101 static __inline uint16_t
102 be16dec(const void *pp)
103 {
104 uint8_t const *p = (uint8_t const *)pp;
105
106 return ((p[0] << 8) | p[1]);
107 }
108
109 static __inline uint32_t
110 be32dec(const void *pp)
111 {
112 uint8_t const *p = (uint8_t const *)pp;
113
114 return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
115 }
116
117 static __inline uint64_t
118 be64dec(const void *pp)
119 {
120 uint8_t const *p = (uint8_t const *)pp;
121
122 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
123 }
124
125 static __inline uint16_t
126 le16dec(const void *pp)
127 {
128 uint8_t const *p = (uint8_t const *)pp;
129
130 return ((p[1] << 8) | p[0]);
131 }
132
133 static __inline uint32_t
134 le32dec(const void *pp)
135 {
136 uint8_t const *p = (uint8_t const *)pp;
137
138 return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
139 }
140
141 static __inline uint64_t
142 le64dec(const void *pp)
143 {
144 uint8_t const *p = (uint8_t const *)pp;
145
146 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
147 }
148
149 static __inline void
150 be16enc(void *pp, uint16_t u)
151 {
152 uint8_t *p = (uint8_t *)pp;
153
154 p[0] = (u >> 8) & 0xff;
155 p[1] = u & 0xff;
156 }
157
158 static __inline void
159 be32enc(void *pp, uint32_t u)
160 {
161 uint8_t *p = (uint8_t *)pp;
162
163 p[0] = (u >> 24) & 0xff;
164 p[1] = (u >> 16) & 0xff;
165 p[2] = (u >> 8) & 0xff;
166 p[3] = u & 0xff;
167 }
168
169 static __inline void
170 be64enc(void *pp, uint64_t u)
171 {
172 uint8_t *p = (uint8_t *)pp;
173
174 be32enc(p, (uint32_t)(u >> 32));
175 be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
176 }
177
178 static __inline void
179 le16enc(void *pp, uint16_t u)
180 {
181 uint8_t *p = (uint8_t *)pp;
182
183 p[0] = u & 0xff;
184 p[1] = (u >> 8) & 0xff;
185 }
186
187 static __inline void
188 le32enc(void *pp, uint32_t u)
189 {
190 uint8_t *p = (uint8_t *)pp;
191
192 p[0] = u & 0xff;
193 p[1] = (u >> 8) & 0xff;
194 p[2] = (u >> 16) & 0xff;
195 p[3] = (u >> 24) & 0xff;
196 }
197
198 static __inline void
199 le64enc(void *pp, uint64_t u)
200 {
201 uint8_t *p = (uint8_t *)pp;
202
203 le32enc(p, (uint32_t)(u & 0xffffffffU));
204 le32enc(p + 4, (uint32_t)(u >> 32));
205 }
206
207 #endif /* _SYS_ENDIAN_H_ */
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