1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
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
29#ifndef _SYS_ENDIAN_H_
30#define _SYS_ENDIAN_H_
31
32#include <sys/cdefs.h>
33#include <sys/_types.h>
34#include <machine/endian.h>
35
36#ifndef _UINT8_T_DECLARED
37typedef	__uint8_t	uint8_t;
38#define	_UINT8_T_DECLARED
39#endif
40
41#ifndef _UINT16_T_DECLARED
42typedef	__uint16_t	uint16_t;
43#define	_UINT16_T_DECLARED
44#endif
45
46#ifndef _UINT32_T_DECLARED
47typedef	__uint32_t	uint32_t;
48#define	_UINT32_T_DECLARED
49#endif
50
51#ifndef _UINT64_T_DECLARED
52typedef	__uint64_t	uint64_t;
53#define	_UINT64_T_DECLARED
54#endif
55
56/*
57 * Note: While tempting to try to avoid namespace pollution from this file,
58 * several software packages assume these marcos are defined, even when it
59 * defines _POSIX_C_SOURCE to request an unpolluted namespace.
60 */
61
62/*
63 * General byte order swapping functions.
64 */
65#define	bswap16(x)	__bswap16(x)
66#define	bswap32(x)	__bswap32(x)
67#define	bswap64(x)	__bswap64(x)
68
69/* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
70static __inline uint16_t
71be16dec(const void *pp)
72{
73	uint8_t const *p = (uint8_t const *)pp;
74
75	return ((p[0] << 8) | p[1]);
76}
77
78static __inline uint32_t
79be32dec(const void *pp)
80{
81	uint8_t const *p = (uint8_t const *)pp;
82
83	return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
84}
85
86static __inline uint64_t
87be64dec(const void *pp)
88{
89	uint8_t const *p = (uint8_t const *)pp;
90
91	return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
92}
93
94static __inline uint16_t
95le16dec(const void *pp)
96{
97	uint8_t const *p = (uint8_t const *)pp;
98
99	return ((p[1] << 8) | p[0]);
100}
101
102static __inline uint32_t
103le32dec(const void *pp)
104{
105	uint8_t const *p = (uint8_t const *)pp;
106
107	return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
108}
109
110static __inline uint64_t
111le64dec(const void *pp)
112{
113	uint8_t const *p = (uint8_t const *)pp;
114
115	return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
116}
117
118static __inline void
119be16enc(void *pp, uint16_t u)
120{
121	uint8_t *p = (uint8_t *)pp;
122
123	p[0] = (u >> 8) & 0xff;
124	p[1] = u & 0xff;
125}
126
127static __inline void
128be32enc(void *pp, uint32_t u)
129{
130	uint8_t *p = (uint8_t *)pp;
131
132	p[0] = (u >> 24) & 0xff;
133	p[1] = (u >> 16) & 0xff;
134	p[2] = (u >> 8) & 0xff;
135	p[3] = u & 0xff;
136}
137
138static __inline void
139be64enc(void *pp, uint64_t u)
140{
141	uint8_t *p = (uint8_t *)pp;
142
143	be32enc(p, (uint32_t)(u >> 32));
144	be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
145}
146
147static __inline void
148le16enc(void *pp, uint16_t u)
149{
150	uint8_t *p = (uint8_t *)pp;
151
152	p[0] = u & 0xff;
153	p[1] = (u >> 8) & 0xff;
154}
155
156static __inline void
157le32enc(void *pp, uint32_t u)
158{
159	uint8_t *p = (uint8_t *)pp;
160
161	p[0] = u & 0xff;
162	p[1] = (u >> 8) & 0xff;
163	p[2] = (u >> 16) & 0xff;
164	p[3] = (u >> 24) & 0xff;
165}
166
167static __inline void
168le64enc(void *pp, uint64_t u)
169{
170	uint8_t *p = (uint8_t *)pp;
171
172	le32enc(p, (uint32_t)(u & 0xffffffffU));
173	le32enc(p + 4, (uint32_t)(u >> 32));
174}
175#endif	/* _SYS_ENDIAN_H_ */
176