xref: /freebsd/contrib/openbsm/compat/endian_enc.h (revision 39ee7a7a6bdd1557b1c3532abf60d139798ac88b)
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  * $P4: //depot/projects/trustedbsd/openbsm/compat/endian_enc.h#1 $
29  */
30 
31 #ifndef _COMPAT_ENDIAN_ENC_H_
32 #define _COMPAT_ENDIAN_ENC_H_
33 
34 /*
35  * Some systems will have the uint/int types defined here already, others
36  * will need stdint.h.
37  */
38 #ifdef HAVE_STDINT_H
39 #include <stdint.h>
40 #endif
41 
42 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
43 
44 static __inline uint16_t
45 be16dec(const void *pp)
46 {
47 	unsigned char const *p = (unsigned char const *)pp;
48 
49 	return ((p[0] << 8) | p[1]);
50 }
51 
52 static __inline uint32_t
53 be32dec(const void *pp)
54 {
55 	unsigned char const *p = (unsigned char const *)pp;
56 
57 	return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
58 }
59 
60 static __inline uint64_t
61 be64dec(const void *pp)
62 {
63 	unsigned char const *p = (unsigned char const *)pp;
64 
65 	return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
66 }
67 
68 static __inline uint16_t
69 le16dec(const void *pp)
70 {
71 	unsigned char const *p = (unsigned char const *)pp;
72 
73 	return ((p[1] << 8) | p[0]);
74 }
75 
76 static __inline uint32_t
77 le32dec(const void *pp)
78 {
79 	unsigned char const *p = (unsigned char const *)pp;
80 
81 	return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
82 }
83 
84 static __inline uint64_t
85 le64dec(const void *pp)
86 {
87 	unsigned char const *p = (unsigned char const *)pp;
88 
89 	return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
90 }
91 
92 static __inline void
93 be16enc(void *pp, uint16_t u)
94 {
95 	unsigned char *p = (unsigned char *)pp;
96 
97 	p[0] = (u >> 8) & 0xff;
98 	p[1] = u & 0xff;
99 }
100 
101 static __inline void
102 be32enc(void *pp, uint32_t u)
103 {
104 	unsigned char *p = (unsigned char *)pp;
105 
106 	p[0] = (u >> 24) & 0xff;
107 	p[1] = (u >> 16) & 0xff;
108 	p[2] = (u >> 8) & 0xff;
109 	p[3] = u & 0xff;
110 }
111 
112 static __inline void
113 be64enc(void *pp, uint64_t u)
114 {
115 	unsigned char *p = (unsigned char *)pp;
116 
117 	be32enc(p, u >> 32);
118 	be32enc(p + 4, u & 0xffffffff);
119 }
120 
121 static __inline void
122 le16enc(void *pp, uint16_t u)
123 {
124 	unsigned char *p = (unsigned char *)pp;
125 
126 	p[0] = u & 0xff;
127 	p[1] = (u >> 8) & 0xff;
128 }
129 
130 static __inline void
131 le32enc(void *pp, uint32_t u)
132 {
133 	unsigned char *p = (unsigned char *)pp;
134 
135 	p[0] = u & 0xff;
136 	p[1] = (u >> 8) & 0xff;
137 	p[2] = (u >> 16) & 0xff;
138 	p[3] = (u >> 24) & 0xff;
139 }
140 
141 static __inline void
142 le64enc(void *pp, uint64_t u)
143 {
144 	unsigned char *p = (unsigned char *)pp;
145 
146 	le32enc(p, u & 0xffffffff);
147 	le32enc(p + 4, u >> 32);
148 }
149 
150 #endif	/* _COMPAT_ENDIAN_ENC_H_ */
151