1 /*-
2 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
3 * Copyright (c) 2005 Robert N. M. Watson
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * Derived from FreeBSD src/sys/sys/endian.h:1.6.
28 */
29
30 #ifndef _COMPAT_ENDIAN_ENC_H_
31 #define _COMPAT_ENDIAN_ENC_H_
32
33 /*
34 * Some systems will have the uint/int types defined here already, others
35 * will need stdint.h.
36 */
37 #ifdef HAVE_STDINT_H
38 #include <stdint.h>
39 #endif
40
41 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
42
43 static __inline uint16_t
be16dec(const void * pp)44 be16dec(const void *pp)
45 {
46 unsigned char const *p = (unsigned char const *)pp;
47
48 return ((p[0] << 8) | p[1]);
49 }
50
51 static __inline uint32_t
be32dec(const void * pp)52 be32dec(const void *pp)
53 {
54 unsigned char const *p = (unsigned char const *)pp;
55
56 return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
57 }
58
59 static __inline uint64_t
be64dec(const void * pp)60 be64dec(const void *pp)
61 {
62 unsigned char const *p = (unsigned char const *)pp;
63
64 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
65 }
66
67 static __inline uint16_t
le16dec(const void * pp)68 le16dec(const void *pp)
69 {
70 unsigned char const *p = (unsigned char const *)pp;
71
72 return ((p[1] << 8) | p[0]);
73 }
74
75 static __inline uint32_t
le32dec(const void * pp)76 le32dec(const void *pp)
77 {
78 unsigned char const *p = (unsigned char const *)pp;
79
80 return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
81 }
82
83 static __inline uint64_t
le64dec(const void * pp)84 le64dec(const void *pp)
85 {
86 unsigned char const *p = (unsigned char const *)pp;
87
88 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
89 }
90
91 static __inline void
be16enc(void * pp,uint16_t u)92 be16enc(void *pp, uint16_t u)
93 {
94 unsigned char *p = (unsigned char *)pp;
95
96 p[0] = (u >> 8) & 0xff;
97 p[1] = u & 0xff;
98 }
99
100 static __inline void
be32enc(void * pp,uint32_t u)101 be32enc(void *pp, uint32_t u)
102 {
103 unsigned char *p = (unsigned char *)pp;
104
105 p[0] = (u >> 24) & 0xff;
106 p[1] = (u >> 16) & 0xff;
107 p[2] = (u >> 8) & 0xff;
108 p[3] = u & 0xff;
109 }
110
111 static __inline void
be64enc(void * pp,uint64_t u)112 be64enc(void *pp, uint64_t u)
113 {
114 unsigned char *p = (unsigned char *)pp;
115
116 be32enc(p, u >> 32);
117 be32enc(p + 4, u & 0xffffffff);
118 }
119
120 static __inline void
le16enc(void * pp,uint16_t u)121 le16enc(void *pp, uint16_t u)
122 {
123 unsigned char *p = (unsigned char *)pp;
124
125 p[0] = u & 0xff;
126 p[1] = (u >> 8) & 0xff;
127 }
128
129 static __inline void
le32enc(void * pp,uint32_t u)130 le32enc(void *pp, uint32_t u)
131 {
132 unsigned char *p = (unsigned char *)pp;
133
134 p[0] = u & 0xff;
135 p[1] = (u >> 8) & 0xff;
136 p[2] = (u >> 16) & 0xff;
137 p[3] = (u >> 24) & 0xff;
138 }
139
140 static __inline void
le64enc(void * pp,uint64_t u)141 le64enc(void *pp, uint64_t u)
142 {
143 unsigned char *p = (unsigned char *)pp;
144
145 le32enc(p, u & 0xffffffff);
146 le32enc(p + 4, u >> 32);
147 }
148
149 #endif /* _COMPAT_ENDIAN_ENC_H_ */
150