1 /*-
2 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/sys/endian.h 208331 2010-05-20 06:16:13Z phk $
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 * General byte order swapping functions.
58 */
59 #define bswap16(x) __bswap16(x)
60 #define bswap32(x) __bswap32(x)
61 #define bswap64(x) __bswap64(x)
62
63 /*
64 * Host to big endian, host to little endian, big endian to host, and little
65 * endian to host byte order functions as detailed in byteorder(9).
66 */
67 #if _BYTE_ORDER == _LITTLE_ENDIAN
68 #define htobe16(x) bswap16((x))
69 #define htobe32(x) bswap32((x))
70 #define htobe64(x) bswap64((x))
71 #define htole16(x) ((uint16_t)(x))
72 #define htole32(x) ((uint32_t)(x))
73 #define htole64(x) ((uint64_t)(x))
74
75 #define be16toh(x) bswap16((x))
76 #define be32toh(x) bswap32((x))
77 #define be64toh(x) bswap64((x))
78 #define le16toh(x) ((uint16_t)(x))
79 #define le32toh(x) ((uint32_t)(x))
80 #define le64toh(x) ((uint64_t)(x))
81 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */
82 #define htobe16(x) ((uint16_t)(x))
83 #define htobe32(x) ((uint32_t)(x))
84 #define htobe64(x) ((uint64_t)(x))
85 #define htole16(x) bswap16((x))
86 #define htole32(x) bswap32((x))
87 #define htole64(x) bswap64((x))
88
89 #define be16toh(x) ((uint16_t)(x))
90 #define be32toh(x) ((uint32_t)(x))
91 #define be64toh(x) ((uint64_t)(x))
92 #define le16toh(x) bswap16((x))
93 #define le32toh(x) bswap32((x))
94 #define le64toh(x) bswap64((x))
95 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
96
97 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
98
99 static __inline uint16_t
be16dec(const void * pp)100 be16dec(const void *pp)
101 {
102 uint8_t const *p = (uint8_t const *)pp;
103
104 return (((unsigned)p[0] << 8) | p[1]);
105 }
106
107 static __inline uint32_t
be32dec(const void * pp)108 be32dec(const void *pp)
109 {
110 uint8_t const *p = (uint8_t const *)pp;
111
112 return (((uint32_t)p[0] << 24) | ((uint32_t)p[1] << 16) |
113 ((uint32_t)p[2] << 8) | p[3]);
114 }
115
116 static __inline uint64_t
be64dec(const void * pp)117 be64dec(const void *pp)
118 {
119 uint8_t const *p = (uint8_t const *)pp;
120
121 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
122 }
123
124 static __inline uint16_t
le16dec(const void * pp)125 le16dec(const void *pp)
126 {
127 uint8_t const *p = (uint8_t const *)pp;
128
129 return (((unsigned)p[1] << 8) | p[0]);
130 }
131
132 static __inline uint32_t
le32dec(const void * pp)133 le32dec(const void *pp)
134 {
135 uint8_t const *p = (uint8_t const *)pp;
136
137 return (((uint32_t)p[3] << 24) | ((uint32_t)p[2] << 16) |
138 ((uint32_t)p[1] << 8) | p[0]);
139 }
140
141 static __inline uint64_t
le64dec(const void * pp)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
be16enc(void * pp,uint16_t u)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
be32enc(void * pp,uint32_t u)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
be64enc(void * pp,uint64_t u)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
le16enc(void * pp,uint16_t u)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
le32enc(void * pp,uint32_t u)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
le64enc(void * pp,uint64_t u)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_ */
208
