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 * Portions copyright (c) 2018, Arm Limited and Contributors.
32 * All rights reserved.
33 */
34
35 #ifndef ENDIAN_H
36 #define ENDIAN_H
37
38 #include <cdefs.h>
39 #include <stdint.h>
40 #include <endian_.h>
41
42 /*
43 * General byte order swapping functions.
44 */
45 #define bswap16(x) __bswap16(x)
46 #define bswap32(x) __bswap32(x)
47 #define bswap64(x) __bswap64(x)
48
49 /*
50 * Host to big endian, host to little endian, big endian to host, and little
51 * endian to host byte order functions as detailed in byteorder(9).
52 */
53 #if _BYTE_ORDER == _LITTLE_ENDIAN
54 #define htobe16(x) bswap16((x))
55 #define htobe32(x) bswap32((x))
56 #define htobe64(x) bswap64((x))
57 #define htole16(x) ((uint16_t)(x))
58 #define htole32(x) ((uint32_t)(x))
59 #define htole64(x) ((uint64_t)(x))
60
61 #define be16toh(x) bswap16((x))
62 #define be32toh(x) bswap32((x))
63 #define be64toh(x) bswap64((x))
64 #define le16toh(x) ((uint16_t)(x))
65 #define le32toh(x) ((uint32_t)(x))
66 #define le64toh(x) ((uint64_t)(x))
67 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */
68 #define htobe16(x) ((uint16_t)(x))
69 #define htobe32(x) ((uint32_t)(x))
70 #define htobe64(x) ((uint64_t)(x))
71 #define htole16(x) bswap16((x))
72 #define htole32(x) bswap32((x))
73 #define htole64(x) bswap64((x))
74
75 #define be16toh(x) ((uint16_t)(x))
76 #define be32toh(x) ((uint32_t)(x))
77 #define be64toh(x) ((uint64_t)(x))
78 #define le16toh(x) bswap16((x))
79 #define le32toh(x) bswap32((x))
80 #define le64toh(x) bswap64((x))
81 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
82
83 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
84
85 static __inline uint16_t
be16dec(const void * pp)86 be16dec(const void *pp)
87 {
88 uint8_t const *p = (uint8_t const *)pp;
89
90 return ((p[0] << 8) | p[1]);
91 }
92
93 static __inline uint32_t
be32dec(const void * pp)94 be32dec(const void *pp)
95 {
96 uint8_t const *p = (uint8_t const *)pp;
97
98 return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
99 }
100
101 static __inline uint64_t
be64dec(const void * pp)102 be64dec(const void *pp)
103 {
104 uint8_t const *p = (uint8_t const *)pp;
105
106 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
107 }
108
109 static __inline uint16_t
le16dec(const void * pp)110 le16dec(const void *pp)
111 {
112 uint8_t const *p = (uint8_t const *)pp;
113
114 return ((p[1] << 8) | p[0]);
115 }
116
117 static __inline uint32_t
le32dec(const void * pp)118 le32dec(const void *pp)
119 {
120 uint8_t const *p = (uint8_t const *)pp;
121
122 return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
123 }
124
125 static __inline uint64_t
le64dec(const void * pp)126 le64dec(const void *pp)
127 {
128 uint8_t const *p = (uint8_t const *)pp;
129
130 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
131 }
132
133 static __inline void
be16enc(void * pp,uint16_t u)134 be16enc(void *pp, uint16_t u)
135 {
136 uint8_t *p = (uint8_t *)pp;
137
138 p[0] = (u >> 8) & 0xff;
139 p[1] = u & 0xff;
140 }
141
142 static __inline void
be32enc(void * pp,uint32_t u)143 be32enc(void *pp, uint32_t u)
144 {
145 uint8_t *p = (uint8_t *)pp;
146
147 p[0] = (u >> 24) & 0xff;
148 p[1] = (u >> 16) & 0xff;
149 p[2] = (u >> 8) & 0xff;
150 p[3] = u & 0xff;
151 }
152
153 static __inline void
be64enc(void * pp,uint64_t u)154 be64enc(void *pp, uint64_t u)
155 {
156 uint8_t *p = (uint8_t *)pp;
157
158 be32enc(p, (uint32_t)(u >> 32));
159 be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
160 }
161
162 static __inline void
le16enc(void * pp,uint16_t u)163 le16enc(void *pp, uint16_t u)
164 {
165 uint8_t *p = (uint8_t *)pp;
166
167 p[0] = u & 0xff;
168 p[1] = (u >> 8) & 0xff;
169 }
170
171 static __inline void
le32enc(void * pp,uint32_t u)172 le32enc(void *pp, uint32_t u)
173 {
174 uint8_t *p = (uint8_t *)pp;
175
176 p[0] = u & 0xff;
177 p[1] = (u >> 8) & 0xff;
178 p[2] = (u >> 16) & 0xff;
179 p[3] = (u >> 24) & 0xff;
180 }
181
182 static __inline void
le64enc(void * pp,uint64_t u)183 le64enc(void *pp, uint64_t u)
184 {
185 uint8_t *p = (uint8_t *)pp;
186
187 le32enc(p, (uint32_t)(u & 0xffffffffU));
188 le32enc(p + 4, (uint32_t)(u >> 32));
189 }
190
191 #endif /* ENDIAN_H */
192
