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
43static __inline uint16_t
44be16dec(const void *pp)
45{
46	unsigned char const *p = (unsigned char const *)pp;
47
48	return ((p[0] << 8) | p[1]);
49}
50
51static __inline uint32_t
52be32dec(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
59static __inline uint64_t
60be64dec(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
67static __inline uint16_t
68le16dec(const void *pp)
69{
70	unsigned char const *p = (unsigned char const *)pp;
71
72	return ((p[1] << 8) | p[0]);
73}
74
75static __inline uint32_t
76le32dec(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
83static __inline uint64_t
84le64dec(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
91static __inline void
92be16enc(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
100static __inline void
101be32enc(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
111static __inline void
112be64enc(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
120static __inline void
121le16enc(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
129static __inline void
130le32enc(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
140static __inline void
141le64enc(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