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. <sys/endian.h>
60 * is not defined by any version of POSIX.1, so we don't have to be
61 * careful. No POSIX.1 defined header file includes <sys/endian.h> on FreeBSD.
62 */
63
64/*
65 * General byte order swapping functions.
66 */
67#define bswap16(x) __bswap16(x)
68#define bswap32(x) __bswap32(x)
69#define bswap64(x) __bswap64(x)
70
71/* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
72static __inline uint16_t
73be16dec(const void *pp)
74{
75 uint8_t const *p = (uint8_t const *)pp;
76
77 return ((p[0] << 8) | p[1]);
78}
79
80static __inline uint32_t
81be32dec(const void *pp)
82{
83 uint8_t const *p = (uint8_t const *)pp;
84
85 return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
86}
87
88static __inline uint64_t
89be64dec(const void *pp)
90{
91 uint8_t const *p = (uint8_t const *)pp;
92
93 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
94}
95
96static __inline uint16_t
97le16dec(const void *pp)
98{
99 uint8_t const *p = (uint8_t const *)pp;
100
101 return ((p[1] << 8) | p[0]);
102}
103
104static __inline uint32_t
105le32dec(const void *pp)
106{
107 uint8_t const *p = (uint8_t const *)pp;
108
109 return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
110}
111
112static __inline uint64_t
113le64dec(const void *pp)
114{
115 uint8_t const *p = (uint8_t const *)pp;
116
117 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
118}
119
120static __inline void
121be16enc(void *pp, uint16_t u)
122{
123 uint8_t *p = (uint8_t *)pp;
124
125 p[0] = (u >> 8) & 0xff;
126 p[1] = u & 0xff;
127}
128
129static __inline void
130be32enc(void *pp, uint32_t u)
131{
132 uint8_t *p = (uint8_t *)pp;
133
134 p[0] = (u >> 24) & 0xff;
135 p[1] = (u >> 16) & 0xff;
136 p[2] = (u >> 8) & 0xff;
137 p[3] = u & 0xff;
138}
139
140static __inline void
141be64enc(void *pp, uint64_t u)
142{
143 uint8_t *p = (uint8_t *)pp;
144
145 be32enc(p, (uint32_t)(u >> 32));
146 be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
147}
148
149static __inline void
150le16enc(void *pp, uint16_t u)
151{
152 uint8_t *p = (uint8_t *)pp;
153
154 p[0] = u & 0xff;
155 p[1] = (u >> 8) & 0xff;
156}
157
158static __inline void
159le32enc(void *pp, uint32_t u)
160{
161 uint8_t *p = (uint8_t *)pp;
162
163 p[0] = u & 0xff;
164 p[1] = (u >> 8) & 0xff;
165 p[2] = (u >> 16) & 0xff;
166 p[3] = (u >> 24) & 0xff;
167}
168
169static __inline void
170le64enc(void *pp, uint64_t u)
171{
172 uint8_t *p = (uint8_t *)pp;
173
174 le32enc(p, (uint32_t)(u & 0xffffffffU));
175 le32enc(p + 4, (uint32_t)(u >> 32));
176}
177#endif /* _SYS_ENDIAN_H_ */