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 ARCHIVE_ENDIAN_H_INCLUDED
32 #define ARCHIVE_ENDIAN_H_INCLUDED
34 /* Note: This is a purely internal header! */
35 /* Do not use this outside of libarchive internal code! */
37 #ifndef __LIBARCHIVE_BUILD
38 #error This header is only to be used internally to libarchive.
42 * Disabling inline keyword for compilers known to choke on it:
43 * - Watcom C++ in C code. (For any version?)
45 * - Microsoft Visual C++ 6.0 (supposedly newer versions too)
46 * - IBM VisualAge 6 (XL v6)
47 * - Sun WorkShop C (SunPro) before 5.9
49 #if defined(__WATCOMC__) || defined(__sgi) || defined(__hpux) || defined(__BORLANDC__)
51 #elif defined(__IBMC__) && __IBMC__ < 700
53 #elif defined(__SUNPRO_C) && __SUNPRO_C < 0x590
55 #elif defined(_MSC_VER) || defined(__osf__)
56 #define inline __inline
59 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
61 static inline uint16_t
62 archive_be16dec(const void *pp)
64 unsigned char const *p = (unsigned char const *)pp;
66 /* Store into unsigned temporaries before left shifting, to avoid
67 promotion to signed int and then left shifting into the sign bit,
68 which is undefined behaviour. */
69 unsigned int p1 = p[1];
70 unsigned int p0 = p[0];
72 return ((p0 << 8) | p1);
75 static inline uint32_t
76 archive_be32dec(const void *pp)
78 unsigned char const *p = (unsigned char const *)pp;
80 /* Store into unsigned temporaries before left shifting, to avoid
81 promotion to signed int and then left shifting into the sign bit,
82 which is undefined behaviour. */
83 unsigned int p3 = p[3];
84 unsigned int p2 = p[2];
85 unsigned int p1 = p[1];
86 unsigned int p0 = p[0];
88 return ((p0 << 24) | (p1 << 16) | (p2 << 8) | p3);
91 static inline uint64_t
92 archive_be64dec(const void *pp)
94 unsigned char const *p = (unsigned char const *)pp;
96 return (((uint64_t)archive_be32dec(p) << 32) | archive_be32dec(p + 4));
99 static inline uint16_t
100 archive_le16dec(const void *pp)
102 unsigned char const *p = (unsigned char const *)pp;
104 /* Store into unsigned temporaries before left shifting, to avoid
105 promotion to signed int and then left shifting into the sign bit,
106 which is undefined behaviour. */
107 unsigned int p1 = p[1];
108 unsigned int p0 = p[0];
110 return ((p1 << 8) | p0);
113 static inline uint32_t
114 archive_le32dec(const void *pp)
116 unsigned char const *p = (unsigned char const *)pp;
118 /* Store into unsigned temporaries before left shifting, to avoid
119 promotion to signed int and then left shifting into the sign bit,
120 which is undefined behaviour. */
121 unsigned int p3 = p[3];
122 unsigned int p2 = p[2];
123 unsigned int p1 = p[1];
124 unsigned int p0 = p[0];
126 return ((p3 << 24) | (p2 << 16) | (p1 << 8) | p0);
129 static inline uint64_t
130 archive_le64dec(const void *pp)
132 unsigned char const *p = (unsigned char const *)pp;
134 return (((uint64_t)archive_le32dec(p + 4) << 32) | archive_le32dec(p));
138 archive_be16enc(void *pp, uint16_t u)
140 unsigned char *p = (unsigned char *)pp;
142 p[0] = (u >> 8) & 0xff;
147 archive_be32enc(void *pp, uint32_t u)
149 unsigned char *p = (unsigned char *)pp;
151 p[0] = (u >> 24) & 0xff;
152 p[1] = (u >> 16) & 0xff;
153 p[2] = (u >> 8) & 0xff;
158 archive_be64enc(void *pp, uint64_t u)
160 unsigned char *p = (unsigned char *)pp;
162 archive_be32enc(p, (uint32_t)(u >> 32));
163 archive_be32enc(p + 4, (uint32_t)(u & 0xffffffff));
167 archive_le16enc(void *pp, uint16_t u)
169 unsigned char *p = (unsigned char *)pp;
172 p[1] = (u >> 8) & 0xff;
176 archive_le32enc(void *pp, uint32_t u)
178 unsigned char *p = (unsigned char *)pp;
181 p[1] = (u >> 8) & 0xff;
182 p[2] = (u >> 16) & 0xff;
183 p[3] = (u >> 24) & 0xff;
187 archive_le64enc(void *pp, uint64_t u)
189 unsigned char *p = (unsigned char *)pp;
191 archive_le32enc(p, (uint32_t)(u & 0xffffffff));
192 archive_le32enc(p + 4, (uint32_t)(u >> 32));