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
44static __inline uint16_t
45be16dec(const void *pp)
46{
47	unsigned char const *p = (unsigned char const *)pp;
48
49	return ((p[0] << 8) | p[1]);
50}
51
52static __inline uint32_t
53be32dec(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
60static __inline uint64_t
61be64dec(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
68static __inline uint16_t
69le16dec(const void *pp)
70{
71	unsigned char const *p = (unsigned char const *)pp;
72
73	return ((p[1] << 8) | p[0]);
74}
75
76static __inline uint32_t
77le32dec(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
84static __inline uint64_t
85le64dec(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
92static __inline void
93be16enc(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
101static __inline void
102be32enc(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
112static __inline void
113be64enc(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
121static __inline void
122le16enc(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
130static __inline void
131le32enc(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
141static __inline void
142le64enc(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