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 * Borrowed from FreeBSD's <sys/endian.h>
27 */
28
29 #ifndef ARCHIVE_ENDIAN_H_INCLUDED
30 #define ARCHIVE_ENDIAN_H_INCLUDED
31
32 /* Note: This is a purely internal header! */
33 /* Do not use this outside of libarchive internal code! */
34
35 #ifndef __LIBARCHIVE_BUILD
36 #error This header is only to be used internally to libarchive.
37 #endif
38
39 /*
40 * Disabling inline keyword for compilers known to choke on it:
41 * - Watcom C++ in C code. (For any version?)
42 * - SGI MIPSpro
43 * - Microsoft Visual C++ 6.0 (supposedly newer versions too)
44 * - IBM VisualAge 6 (XL v6)
45 * - Sun WorkShop C (SunPro) before 5.9
46 */
47 #if defined(__WATCOMC__) || defined(__sgi) || defined(__hpux) || defined(__BORLANDC__)
48 #define inline
49 #elif defined(__IBMC__) && __IBMC__ < 700
50 #define inline
51 #elif defined(__SUNPRO_C) && __SUNPRO_C < 0x590
52 #define inline
53 #elif defined(_MSC_VER) || defined(__osf__)
54 #define inline __inline
55 #endif
56
57 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
58
59 static inline uint16_t
archive_be16dec(const void * pp)60 archive_be16dec(const void *pp)
61 {
62 unsigned char const *p = (unsigned char const *)pp;
63
64 /* Store into unsigned temporaries before left shifting, to avoid
65 promotion to signed int and then left shifting into the sign bit,
66 which is undefined behaviour. */
67 unsigned int p1 = p[1];
68 unsigned int p0 = p[0];
69
70 return ((p0 << 8) | p1);
71 }
72
73 static inline uint32_t
archive_be32dec(const void * pp)74 archive_be32dec(const void *pp)
75 {
76 unsigned char const *p = (unsigned char const *)pp;
77
78 /* Store into unsigned temporaries before left shifting, to avoid
79 promotion to signed int and then left shifting into the sign bit,
80 which is undefined behaviour. */
81 unsigned int p3 = p[3];
82 unsigned int p2 = p[2];
83 unsigned int p1 = p[1];
84 unsigned int p0 = p[0];
85
86 return ((p0 << 24) | (p1 << 16) | (p2 << 8) | p3);
87 }
88
89 static inline uint64_t
archive_be64dec(const void * pp)90 archive_be64dec(const void *pp)
91 {
92 unsigned char const *p = (unsigned char const *)pp;
93
94 return (((uint64_t)archive_be32dec(p) << 32) | archive_be32dec(p + 4));
95 }
96
97 static inline uint16_t
archive_le16dec(const void * pp)98 archive_le16dec(const void *pp)
99 {
100 unsigned char const *p = (unsigned char const *)pp;
101
102 /* Store into unsigned temporaries before left shifting, to avoid
103 promotion to signed int and then left shifting into the sign bit,
104 which is undefined behaviour. */
105 unsigned int p1 = p[1];
106 unsigned int p0 = p[0];
107
108 return ((p1 << 8) | p0);
109 }
110
111 static inline uint32_t
archive_le32dec(const void * pp)112 archive_le32dec(const void *pp)
113 {
114 unsigned char const *p = (unsigned char const *)pp;
115
116 /* Store into unsigned temporaries before left shifting, to avoid
117 promotion to signed int and then left shifting into the sign bit,
118 which is undefined behaviour. */
119 unsigned int p3 = p[3];
120 unsigned int p2 = p[2];
121 unsigned int p1 = p[1];
122 unsigned int p0 = p[0];
123
124 return ((p3 << 24) | (p2 << 16) | (p1 << 8) | p0);
125 }
126
127 static inline uint64_t
archive_le64dec(const void * pp)128 archive_le64dec(const void *pp)
129 {
130 unsigned char const *p = (unsigned char const *)pp;
131
132 return (((uint64_t)archive_le32dec(p + 4) << 32) | archive_le32dec(p));
133 }
134
135 static inline void
archive_be16enc(void * pp,uint16_t u)136 archive_be16enc(void *pp, uint16_t u)
137 {
138 unsigned char *p = (unsigned char *)pp;
139
140 p[0] = (u >> 8) & 0xff;
141 p[1] = u & 0xff;
142 }
143
144 static inline void
archive_be32enc(void * pp,uint32_t u)145 archive_be32enc(void *pp, uint32_t u)
146 {
147 unsigned char *p = (unsigned char *)pp;
148
149 p[0] = (u >> 24) & 0xff;
150 p[1] = (u >> 16) & 0xff;
151 p[2] = (u >> 8) & 0xff;
152 p[3] = u & 0xff;
153 }
154
155 static inline void
archive_be64enc(void * pp,uint64_t u)156 archive_be64enc(void *pp, uint64_t u)
157 {
158 unsigned char *p = (unsigned char *)pp;
159
160 archive_be32enc(p, (uint32_t)(u >> 32));
161 archive_be32enc(p + 4, (uint32_t)(u & 0xffffffff));
162 }
163
164 static inline void
archive_le16enc(void * pp,uint16_t u)165 archive_le16enc(void *pp, uint16_t u)
166 {
167 unsigned char *p = (unsigned char *)pp;
168
169 p[0] = u & 0xff;
170 p[1] = (u >> 8) & 0xff;
171 }
172
173 static inline void
archive_le32enc(void * pp,uint32_t u)174 archive_le32enc(void *pp, uint32_t u)
175 {
176 unsigned char *p = (unsigned char *)pp;
177
178 p[0] = u & 0xff;
179 p[1] = (u >> 8) & 0xff;
180 p[2] = (u >> 16) & 0xff;
181 p[3] = (u >> 24) & 0xff;
182 }
183
184 static inline void
archive_le64enc(void * pp,uint64_t u)185 archive_le64enc(void *pp, uint64_t u)
186 {
187 unsigned char *p = (unsigned char *)pp;
188
189 archive_le32enc(p, (uint32_t)(u & 0xffffffff));
190 archive_le32enc(p + 4, (uint32_t)(u >> 32));
191 }
192
193 #endif
194