archive_endian.h revision 238856 
1/*-
2 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/contrib/libarchive/libarchive/archive_endian.h 238856 2012-07-28 06:38:44Z mm $
27 *
28 * Borrowed from FreeBSD's <sys/endian.h>
29 */
30
31#ifndef __LIBARCHIVE_BUILD
32#error This header is only to be used internally to libarchive.
33#endif
34
35/* Note:  This is a purely internal header! */
36/* Do not use this outside of libarchive internal code! */
37
38#ifndef ARCHIVE_ENDIAN_H_INCLUDED
39#define ARCHIVE_ENDIAN_H_INCLUDED
40
41
42/*
43 * Disabling inline keyword for compilers known to choke on it:
44 * - Watcom C++ in C code.  (For any version?)
45 * - SGI MIPSpro
46 * - Microsoft Visual C++ 6.0 (supposedly newer versions too)
47 */
48#if defined(__WATCOMC__) || defined(__sgi) || defined(__hpux) || defined(__BORLANDC__)
49#define	inline
50#elif defined(_MSC_VER)
51#define inline __inline
52#endif
53
54/* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
55
56static inline uint16_t
57archive_be16dec(const void *pp)
58{
59	unsigned char const *p = (unsigned char const *)pp;
60
61	return ((p[0] << 8) | p[1]);
62}
63
64static inline uint32_t
65archive_be32dec(const void *pp)
66{
67	unsigned char const *p = (unsigned char const *)pp;
68
69	return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
70}
71
72static inline uint64_t
73archive_be64dec(const void *pp)
74{
75	unsigned char const *p = (unsigned char const *)pp;
76
77	return (((uint64_t)archive_be32dec(p) << 32) | archive_be32dec(p + 4));
78}
79
80static inline uint16_t
81archive_le16dec(const void *pp)
82{
83	unsigned char const *p = (unsigned char const *)pp;
84
85	return ((p[1] << 8) | p[0]);
86}
87
88static inline uint32_t
89archive_le32dec(const void *pp)
90{
91	unsigned char const *p = (unsigned char const *)pp;
92
93	return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
94}
95
96static inline uint64_t
97archive_le64dec(const void *pp)
98{
99	unsigned char const *p = (unsigned char const *)pp;
100
101	return (((uint64_t)archive_le32dec(p + 4) << 32) | archive_le32dec(p));
102}
103
104static inline void
105archive_be16enc(void *pp, uint16_t u)
106{
107	unsigned char *p = (unsigned char *)pp;
108
109	p[0] = (u >> 8) & 0xff;
110	p[1] = u & 0xff;
111}
112
113static inline void
114archive_be32enc(void *pp, uint32_t u)
115{
116	unsigned char *p = (unsigned char *)pp;
117
118	p[0] = (u >> 24) & 0xff;
119	p[1] = (u >> 16) & 0xff;
120	p[2] = (u >> 8) & 0xff;
121	p[3] = u & 0xff;
122}
123
124static inline void
125archive_be64enc(void *pp, uint64_t u)
126{
127	unsigned char *p = (unsigned char *)pp;
128
129	archive_be32enc(p, (uint32_t)(u >> 32));
130	archive_be32enc(p + 4, (uint32_t)(u & 0xffffffff));
131}
132
133static inline void
134archive_le16enc(void *pp, uint16_t u)
135{
136	unsigned char *p = (unsigned char *)pp;
137
138	p[0] = u & 0xff;
139	p[1] = (u >> 8) & 0xff;
140}
141
142static inline void
143archive_le32enc(void *pp, uint32_t u)
144{
145	unsigned char *p = (unsigned char *)pp;
146
147	p[0] = u & 0xff;
148	p[1] = (u >> 8) & 0xff;
149	p[2] = (u >> 16) & 0xff;
150	p[3] = (u >> 24) & 0xff;
151}
152
153static inline void
154archive_le64enc(void *pp, uint64_t u)
155{
156	unsigned char *p = (unsigned char *)pp;
157
158	archive_le32enc(p, (uint32_t)(u & 0xffffffff));
159	archive_le32enc(p + 4, (uint32_t)(u >> 32));
160}
161
162#endif
163