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_H_
31#define _COMPAT_ENDIAN_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/*
42 * Some operating systems do not yet have the more recent endian APIs that
43 * permit encoding to and decoding from byte streams.  For those systems, we
44 * implement local non-optimized versions.
45 */
46
47static __inline uint16_t
48bswap16(uint16_t int16)
49{
50	const unsigned char *from;
51	unsigned char *to;
52	uint16_t t;
53
54	from = (const unsigned char *) &int16;
55	to = (unsigned char *) &t;
56
57	to[0] = from[1];
58	to[1] = from[0];
59
60	return (t);
61}
62
63static __inline uint32_t
64bswap32(uint32_t int32)
65{
66	const unsigned char *from;
67	unsigned char *to;
68	uint32_t t;
69
70	from = (const unsigned char *) &int32;
71	to = (unsigned char *) &t;
72
73	to[0] = from[3];
74	to[1] = from[2];
75	to[2] = from[1];
76	to[3] = from[0];
77
78	return (t);
79}
80
81static __inline uint64_t
82bswap64(uint64_t int64)
83{
84	const unsigned char *from;
85	unsigned char *to;
86	uint64_t t;
87
88	from = (const unsigned char *) &int64;
89	to = (unsigned char *) &t;
90
91	to[0] = from[7];
92	to[1] = from[6];
93	to[2] = from[5];
94	to[3] = from[4];
95	to[4] = from[3];
96	to[5] = from[2];
97	to[6] = from[1];
98	to[7] = from[0];
99
100	return (t);
101}
102
103#if defined(BYTE_ORDER) && !defined(_BYTE_ORDER)
104#define	_BYTE_ORDER	BYTE_ORDER
105#endif
106#if !defined(_BYTE_ORDER)
107#error "Neither BYTE_ORDER nor _BYTE_ORDER defined"
108#endif
109
110#if defined(BIG_ENDIAN) && !defined(_BIG_ENDIAN)
111#define	_BIG_ENDIAN	BIG_ENDIAN
112#endif
113
114#if defined(LITTLE_ENDIAN) && !defined(_LITTLE_ENDIAN)
115#define	_LITTLE_ENDIAN	LITTLE_ENDIAN
116#endif
117
118/* XXX: Hack. */
119#ifndef htobe16
120/*
121 * Host to big endian, host to little endian, big endian to host, and little
122 * endian to host byte order functions as detailed in byteorder(9).
123 */
124#if _BYTE_ORDER == _LITTLE_ENDIAN
125#define	htobe16(x)	bswap16((x))
126#define	htobe32(x)	bswap32((x))
127#define	htobe64(x)	bswap64((x))
128#define	htole16(x)	((uint16_t)(x))
129#define	htole32(x)	((uint32_t)(x))
130#define	htole64(x)	((uint64_t)(x))
131
132#define	be16toh(x)	bswap16((x))
133#define	be32toh(x)	bswap32((x))
134#define	be64toh(x)	bswap64((x))
135#define	le16toh(x)	((uint16_t)(x))
136#define	le32toh(x)	((uint32_t)(x))
137#define	le64toh(x)	((uint64_t)(x))
138#else /* _BYTE_ORDER != _LITTLE_ENDIAN */
139#define	htobe16(x)	((uint16_t)(x))
140#define	htobe32(x)	((uint32_t)(x))
141#define	htobe64(x)	((uint64_t)(x))
142#define	htole16(x)	bswap16((x))
143#define	htole32(x)	bswap32((x))
144#define	htole64(x)	bswap64((x))
145
146#define	be16toh(x)	((uint16_t)(x))
147#define	be32toh(x)	((uint32_t)(x))
148#define	be64toh(x)	((uint64_t)(x))
149#define	le16toh(x)	bswap16((x))
150#define	le32toh(x)	bswap32((x))
151#define	le64toh(x)	bswap64((x))
152#endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
153#endif
154
155#endif	/* _COMPAT_ENDIAN_H_ */
156