1 /*-
2 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
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: src/sys/sys/endian.h,v 1.2.2.1 2002/09/09 05:45:04 imp Exp $
29 */
30
31 #ifndef _SYS_ENDIAN_H_
32 #define _SYS_ENDIAN_H_
33
34 #include <sys/types.h>
35 #include <machine/endian.h>
36
37 /*
38 * Define the order of 32-bit words in 64-bit words.
39 */
40 #if _BYTE_ORDER == _LITTLE_ENDIAN
41 #define _QUAD_HIGHWORD 1
42 #define _QUAD_LOWWORD 0
43 #endif
44
45 #if _BYTE_ORDER == _BIG_ENDIAN
46 #define _QUAD_HIGHWORD 0
47 #define _QUAD_LOWWORD 1
48 #endif
49
50 /*
51 * General byte order swapping functions.
52 */
53 #define bswap16(x) __bswap16(x)
54 #define bswap32(x) __bswap32(x)
55 #define bswap64(x) __bswap64(x)
56
57 /*
58 * Host to big endian, host to little endian, big endian to host, and little
59 * endian to host byte order functions as detailed in byteorder(9).
60 */
61 #if _BYTE_ORDER == _LITTLE_ENDIAN
62 #define htobe16(x) __bswap16((x))
63 #define htobe32(x) __bswap32((x))
64 #define htobe64(x) __bswap64((x))
65 #define htole16(x) ((__uint16_t)(x))
66 #define htole32(x) ((__uint32_t)(x))
67 #define htole64(x) ((__uint64_t)(x))
68
69 #define be16toh(x) __bswap16((x))
70 #define be32toh(x) __bswap32((x))
71 #define be64toh(x) __bswap64((x))
72 #define le16toh(x) ((__uint16_t)(x))
73 #define le32toh(x) ((__uint32_t)(x))
74 #define le64toh(x) ((__uint64_t)(x))
75 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */
76 #define htobe16(x) ((__uint16_t)(x))
77 #define htobe32(x) ((__uint32_t)(x))
78 #define htobe64(x) ((__uint64_t)(x))
79 #define htole16(x) __bswap16((x))
80 #define htole32(x) __bswap32((x))
81 #define htole64(x) __bswap64((x))
82
83 #define be16toh(x) ((__uint16_t)(x))
84 #define be32toh(x) ((__uint32_t)(x))
85 #define be64toh(x) ((__uint64_t)(x))
86 #define le16toh(x) __bswap16((x))
87 #define le32toh(x) __bswap32((x))
88 #define le64toh(x) __bswap64((x))
89 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
90
91 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
92
93 static __inline __uint16_t
be16dec(const void * pp)94 be16dec(const void *pp)
95 {
96 const __uint8_t *p = (const __uint8_t *)pp;
97
98 return ((p[0] << 8) | p[1]);
99 }
100
101 static __inline __uint32_t
be32dec(const void * pp)102 be32dec(const void *pp)
103 {
104 const __uint8_t *p = (const __uint8_t *)pp;
105
106 return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
107 }
108
109 static __inline __uint64_t
be64dec(const void * pp)110 be64dec(const void *pp)
111 {
112 const __uint8_t *p = (const __uint8_t *)pp;
113
114 return (((__uint64_t)be32dec(p) << 32) | be32dec(p + 4));
115 }
116
117 static __inline __uint16_t
le16dec(const void * pp)118 le16dec(const void *pp)
119 {
120 const __uint8_t *p = (const __uint8_t *)pp;
121
122 return ((p[1] << 8) | p[0]);
123 }
124
125 static __inline __uint32_t
le32dec(const void * pp)126 le32dec(const void *pp)
127 {
128 const __uint8_t *p = (const __uint8_t *)pp;
129
130 return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
131 }
132
133 static __inline __uint64_t
le64dec(const void * pp)134 le64dec(const void *pp)
135 {
136 const __uint8_t *p = (const __uint8_t *)pp;
137
138 return (((__uint64_t)le32dec(p + 4) << 32) | le32dec(p));
139 }
140
141 static __inline void
be16enc(void * pp,__uint16_t u)142 be16enc(void *pp, __uint16_t u)
143 {
144 __uint8_t *p = (__uint8_t *)pp;
145
146 p[0] = (u >> 8) & 0xff;
147 p[1] = u & 0xff;
148 }
149
150 static __inline void
be32enc(void * pp,__uint32_t u)151 be32enc(void *pp, __uint32_t u)
152 {
153 __uint8_t *p = (__uint8_t *)pp;
154
155 p[0] = (u >> 24) & 0xff;
156 p[1] = (u >> 16) & 0xff;
157 p[2] = (u >> 8) & 0xff;
158 p[3] = u & 0xff;
159 }
160
161 static __inline void
be64enc(void * pp,__uint64_t u)162 be64enc(void *pp, __uint64_t u)
163 {
164 __uint8_t *p = (__uint8_t *)pp;
165
166 be32enc(p, u >> 32);
167 be32enc(p + 4, u & 0xffffffff);
168 }
169
170 static __inline void
le16enc(void * pp,__uint16_t u)171 le16enc(void *pp, __uint16_t u)
172 {
173 __uint8_t *p = (__uint8_t *)pp;
174
175 p[0] = u & 0xff;
176 p[1] = (u >> 8) & 0xff;
177 }
178
179 static __inline void
le32enc(void * pp,__uint32_t u)180 le32enc(void *pp, __uint32_t u)
181 {
182 __uint8_t *p = (__uint8_t *)pp;
183
184 p[0] = u & 0xff;
185 p[1] = (u >> 8) & 0xff;
186 p[2] = (u >> 16) & 0xff;
187 p[3] = (u >> 24) & 0xff;
188 }
189
190 static __inline void
le64enc(void * pp,__uint64_t u)191 le64enc(void *pp, __uint64_t u)
192 {
193 __uint8_t *p = (__uint8_t *)pp;
194
195 le32enc(p, u & 0xffffffff);
196 le32enc(p + 4, u >> 32);
197 }
198
199 #endif /* _SYS_ENDIAN_H_ */
200