2 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
3 * Copyright (c) 2005 Robert N. M. Watson
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
27 * Derived from FreeBSD src/sys/sys/endian.h:1.6.
30 #ifndef _COMPAT_ENDIAN_ENC_H_
31 #define _COMPAT_ENDIAN_ENC_H_
34 * Some systems will have the uint/int types defined here already, others
41 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
43 static __inline uint16_t
44 be16dec(const void *pp)
46 unsigned char const *p = (unsigned char const *)pp;
48 return ((p[0] << 8) | p[1]);
51 static __inline uint32_t
52 be32dec(const void *pp)
54 unsigned char const *p = (unsigned char const *)pp;
56 return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
59 static __inline uint64_t
60 be64dec(const void *pp)
62 unsigned char const *p = (unsigned char const *)pp;
64 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
67 static __inline uint16_t
68 le16dec(const void *pp)
70 unsigned char const *p = (unsigned char const *)pp;
72 return ((p[1] << 8) | p[0]);
75 static __inline uint32_t
76 le32dec(const void *pp)
78 unsigned char const *p = (unsigned char const *)pp;
80 return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
83 static __inline uint64_t
84 le64dec(const void *pp)
86 unsigned char const *p = (unsigned char const *)pp;
88 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
92 be16enc(void *pp, uint16_t u)
94 unsigned char *p = (unsigned char *)pp;
96 p[0] = (u >> 8) & 0xff;
101 be32enc(void *pp, uint32_t u)
103 unsigned char *p = (unsigned char *)pp;
105 p[0] = (u >> 24) & 0xff;
106 p[1] = (u >> 16) & 0xff;
107 p[2] = (u >> 8) & 0xff;
112 be64enc(void *pp, uint64_t u)
114 unsigned char *p = (unsigned char *)pp;
117 be32enc(p + 4, u & 0xffffffff);
121 le16enc(void *pp, uint16_t u)
123 unsigned char *p = (unsigned char *)pp;
126 p[1] = (u >> 8) & 0xff;
130 le32enc(void *pp, uint32_t u)
132 unsigned char *p = (unsigned char *)pp;
135 p[1] = (u >> 8) & 0xff;
136 p[2] = (u >> 16) & 0xff;
137 p[3] = (u >> 24) & 0xff;
141 le64enc(void *pp, uint64_t u)
143 unsigned char *p = (unsigned char *)pp;
145 le32enc(p, u & 0xffffffff);
146 le32enc(p + 4, u >> 32);
149 #endif /* _COMPAT_ENDIAN_ENC_H_ */