2 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
28 * Borrowed from FreeBSD's <sys/endian.h>
31 #ifndef __LIBARCHIVE_BUILD
32 #error This header is only to be used internally to libarchive.
35 /* Note: This is a purely internal header! */
36 /* Do not use this outside of libarchive internal code! */
38 #ifndef ARCHIVE_ENDIAN_H_INCLUDED
39 #define ARCHIVE_ENDIAN_H_INCLUDED
43 * Disabling inline keyword for compilers known to choke on it:
44 * - Watcom C++ in C code. (For any version?)
46 * - Microsoft Visual C++ 6.0 (supposedly newer versions too)
47 * - IBM VisualAge 6 (XL v6)
48 * - Sun WorkShop C (SunPro) before 5.9
50 #if defined(__WATCOMC__) || defined(__sgi) || defined(__hpux) || defined(__BORLANDC__)
52 #elif defined(__IBMC__) && __IBMC__ < 700
54 #elif defined(__SUNPRO_C) && __SUNPRO_C < 0x590
56 #elif defined(_MSC_VER) || defined(__osf__)
57 #define inline __inline
60 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
62 static inline uint16_t
63 archive_be16dec(const void *pp)
65 unsigned char const *p = (unsigned char const *)pp;
67 /* Store into unsigned temporaries before left shifting, to avoid
68 promotion to signed int and then left shifting into the sign bit,
69 which is undefined behaviour. */
70 unsigned int p1 = p[1];
71 unsigned int p0 = p[0];
73 return ((p0 << 8) | p1);
76 static inline uint32_t
77 archive_be32dec(const void *pp)
79 unsigned char const *p = (unsigned char const *)pp;
81 /* Store into unsigned temporaries before left shifting, to avoid
82 promotion to signed int and then left shifting into the sign bit,
83 which is undefined behaviour. */
84 unsigned int p3 = p[3];
85 unsigned int p2 = p[2];
86 unsigned int p1 = p[1];
87 unsigned int p0 = p[0];
89 return ((p0 << 24) | (p1 << 16) | (p2 << 8) | p3);
92 static inline uint64_t
93 archive_be64dec(const void *pp)
95 unsigned char const *p = (unsigned char const *)pp;
97 return (((uint64_t)archive_be32dec(p) << 32) | archive_be32dec(p + 4));
100 static inline uint16_t
101 archive_le16dec(const void *pp)
103 unsigned char const *p = (unsigned char const *)pp;
105 /* Store into unsigned temporaries before left shifting, to avoid
106 promotion to signed int and then left shifting into the sign bit,
107 which is undefined behaviour. */
108 unsigned int p1 = p[1];
109 unsigned int p0 = p[0];
111 return ((p1 << 8) | p0);
114 static inline uint32_t
115 archive_le32dec(const void *pp)
117 unsigned char const *p = (unsigned char const *)pp;
119 /* Store into unsigned temporaries before left shifting, to avoid
120 promotion to signed int and then left shifting into the sign bit,
121 which is undefined behaviour. */
122 unsigned int p3 = p[3];
123 unsigned int p2 = p[2];
124 unsigned int p1 = p[1];
125 unsigned int p0 = p[0];
127 return ((p3 << 24) | (p2 << 16) | (p1 << 8) | p0);
130 static inline uint64_t
131 archive_le64dec(const void *pp)
133 unsigned char const *p = (unsigned char const *)pp;
135 return (((uint64_t)archive_le32dec(p + 4) << 32) | archive_le32dec(p));
139 archive_be16enc(void *pp, uint16_t u)
141 unsigned char *p = (unsigned char *)pp;
143 p[0] = (u >> 8) & 0xff;
148 archive_be32enc(void *pp, uint32_t u)
150 unsigned char *p = (unsigned char *)pp;
152 p[0] = (u >> 24) & 0xff;
153 p[1] = (u >> 16) & 0xff;
154 p[2] = (u >> 8) & 0xff;
159 archive_be64enc(void *pp, uint64_t u)
161 unsigned char *p = (unsigned char *)pp;
163 archive_be32enc(p, (uint32_t)(u >> 32));
164 archive_be32enc(p + 4, (uint32_t)(u & 0xffffffff));
168 archive_le16enc(void *pp, uint16_t u)
170 unsigned char *p = (unsigned char *)pp;
173 p[1] = (u >> 8) & 0xff;
177 archive_le32enc(void *pp, uint32_t u)
179 unsigned char *p = (unsigned char *)pp;
182 p[1] = (u >> 8) & 0xff;
183 p[2] = (u >> 16) & 0xff;
184 p[3] = (u >> 24) & 0xff;
188 archive_le64enc(void *pp, uint64_t u)
190 unsigned char *p = (unsigned char *)pp;
192 archive_le32enc(p, (uint32_t)(u & 0xffffffff));
193 archive_le32enc(p + 4, (uint32_t)(u >> 32));