2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
29 #ifndef _SYS_ENDIAN_H_
30 #define _SYS_ENDIAN_H_
32 #include <sys/cdefs.h>
33 #include <sys/_types.h>
34 #include <machine/endian.h>
36 #ifndef _UINT8_T_DECLARED
37 typedef __uint8_t uint8_t;
38 #define _UINT8_T_DECLARED
41 #ifndef _UINT16_T_DECLARED
42 typedef __uint16_t uint16_t;
43 #define _UINT16_T_DECLARED
46 #ifndef _UINT32_T_DECLARED
47 typedef __uint32_t uint32_t;
48 #define _UINT32_T_DECLARED
51 #ifndef _UINT64_T_DECLARED
52 typedef __uint64_t uint64_t;
53 #define _UINT64_T_DECLARED
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.
63 * General byte order swapping functions.
65 #define bswap16(x) __bswap16(x)
66 #define bswap32(x) __bswap32(x)
67 #define bswap64(x) __bswap64(x)
69 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
70 static __inline uint16_t
71 be16dec(const void *pp)
73 uint8_t const *p = (uint8_t const *)pp;
75 return ((p[0] << 8) | p[1]);
78 static __inline uint32_t
79 be32dec(const void *pp)
81 uint8_t const *p = (uint8_t const *)pp;
83 return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
86 static __inline uint64_t
87 be64dec(const void *pp)
89 uint8_t const *p = (uint8_t const *)pp;
91 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
94 static __inline uint16_t
95 le16dec(const void *pp)
97 uint8_t const *p = (uint8_t const *)pp;
99 return ((p[1] << 8) | p[0]);
102 static __inline uint32_t
103 le32dec(const void *pp)
105 uint8_t const *p = (uint8_t const *)pp;
107 return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
110 static __inline uint64_t
111 le64dec(const void *pp)
113 uint8_t const *p = (uint8_t const *)pp;
115 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
119 be16enc(void *pp, uint16_t u)
121 uint8_t *p = (uint8_t *)pp;
123 p[0] = (u >> 8) & 0xff;
128 be32enc(void *pp, uint32_t u)
130 uint8_t *p = (uint8_t *)pp;
132 p[0] = (u >> 24) & 0xff;
133 p[1] = (u >> 16) & 0xff;
134 p[2] = (u >> 8) & 0xff;
139 be64enc(void *pp, uint64_t u)
141 uint8_t *p = (uint8_t *)pp;
143 be32enc(p, (uint32_t)(u >> 32));
144 be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
148 le16enc(void *pp, uint16_t u)
150 uint8_t *p = (uint8_t *)pp;
153 p[1] = (u >> 8) & 0xff;
157 le32enc(void *pp, uint32_t u)
159 uint8_t *p = (uint8_t *)pp;
162 p[1] = (u >> 8) & 0xff;
163 p[2] = (u >> 16) & 0xff;
164 p[3] = (u >> 24) & 0xff;
168 le64enc(void *pp, uint64_t u)
170 uint8_t *p = (uint8_t *)pp;
172 le32enc(p, (uint32_t)(u & 0xffffffffU));
173 le32enc(p + 4, (uint32_t)(u >> 32));
175 #endif /* _SYS_ENDIAN_H_ */