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/lib/libarchive/archive_endian.h 201085 2009-12-28 02:17:15Z kientzle $
27 *
28 * Borrowed from FreeBSD's <sys/endian.h>
29 */
30
31 #ifndef ARCHIVE_ENDIAN_H_INCLUDED
32 #define ARCHIVE_ENDIAN_H_INCLUDED
33
34 /* Note: This is a purely internal header! */
35 /* Do not use this outside of libarchive internal code! */
36
37 #ifndef __LIBARCHIVE_BUILD
38 #error This header is only to be used internally to libarchive.
39 #endif
40
41 /*
42 * Disabling inline keyword for compilers known to choke on it:
43 * - Watcom C++ in C code. (For any version?)
44 * - SGI MIPSpro
45 * - Microsoft Visual C++ 6.0 (supposedly newer versions too)
46 * - IBM VisualAge 6 (XL v6)
47 * - Sun WorkShop C (SunPro) before 5.9
48 */
49 #if defined(__WATCOMC__) || defined(__sgi) || defined(__hpux) || defined(__BORLANDC__)
50 #define inline
51 #elif defined(__IBMC__) && __IBMC__ < 700
52 #define inline
53 #elif defined(__SUNPRO_C) && __SUNPRO_C < 0x590
54 #define inline
55 #elif defined(_MSC_VER) || defined(__osf__)
56 #define inline __inline
57 #endif
58
59 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
60
61 static inline uint16_t
archive_be16dec(const void * pp)62 archive_be16dec(const void *pp)
63 {
64 unsigned char const *p = (unsigned char const *)pp;
65
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];
71
72 return ((p0 << 8) | p1);
73 }
74
75 static inline uint32_t
archive_be32dec(const void * pp)76 archive_be32dec(const void *pp)
77 {
78 unsigned char const *p = (unsigned char const *)pp;
79
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];
87
88 return ((p0 << 24) | (p1 << 16) | (p2 << 8) | p3);
89 }
90
91 static inline uint64_t
archive_be64dec(const void * pp)92 archive_be64dec(const void *pp)
93 {
94 unsigned char const *p = (unsigned char const *)pp;
95
96 return (((uint64_t)archive_be32dec(p) << 32) | archive_be32dec(p + 4));
97 }
98
99 static inline uint16_t
archive_le16dec(const void * pp)100 archive_le16dec(const void *pp)
101 {
102 unsigned char const *p = (unsigned char const *)pp;
103
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];
109
110 return ((p1 << 8) | p0);
111 }
112
113 static inline uint32_t
archive_le32dec(const void * pp)114 archive_le32dec(const void *pp)
115 {
116 unsigned char const *p = (unsigned char const *)pp;
117
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];
125
126 return ((p3 << 24) | (p2 << 16) | (p1 << 8) | p0);
127 }
128
129 static inline uint64_t
archive_le64dec(const void * pp)130 archive_le64dec(const void *pp)
131 {
132 unsigned char const *p = (unsigned char const *)pp;
133
134 return (((uint64_t)archive_le32dec(p + 4) << 32) | archive_le32dec(p));
135 }
136
137 static inline void
archive_be16enc(void * pp,uint16_t u)138 archive_be16enc(void *pp, uint16_t u)
139 {
140 unsigned char *p = (unsigned char *)pp;
141
142 p[0] = (u >> 8) & 0xff;
143 p[1] = u & 0xff;
144 }
145
146 static inline void
archive_be32enc(void * pp,uint32_t u)147 archive_be32enc(void *pp, uint32_t u)
148 {
149 unsigned char *p = (unsigned char *)pp;
150
151 p[0] = (u >> 24) & 0xff;
152 p[1] = (u >> 16) & 0xff;
153 p[2] = (u >> 8) & 0xff;
154 p[3] = u & 0xff;
155 }
156
157 static inline void
archive_be64enc(void * pp,uint64_t u)158 archive_be64enc(void *pp, uint64_t u)
159 {
160 unsigned char *p = (unsigned char *)pp;
161
162 archive_be32enc(p, (uint32_t)(u >> 32));
163 archive_be32enc(p + 4, (uint32_t)(u & 0xffffffff));
164 }
165
166 static inline void
archive_le16enc(void * pp,uint16_t u)167 archive_le16enc(void *pp, uint16_t u)
168 {
169 unsigned char *p = (unsigned char *)pp;
170
171 p[0] = u & 0xff;
172 p[1] = (u >> 8) & 0xff;
173 }
174
175 static inline void
archive_le32enc(void * pp,uint32_t u)176 archive_le32enc(void *pp, uint32_t u)
177 {
178 unsigned char *p = (unsigned char *)pp;
179
180 p[0] = u & 0xff;
181 p[1] = (u >> 8) & 0xff;
182 p[2] = (u >> 16) & 0xff;
183 p[3] = (u >> 24) & 0xff;
184 }
185
186 static inline void
archive_le64enc(void * pp,uint64_t u)187 archive_le64enc(void *pp, uint64_t u)
188 {
189 unsigned char *p = (unsigned char *)pp;
190
191 archive_le32enc(p, (uint32_t)(u & 0xffffffff));
192 archive_le32enc(p + 4, (uint32_t)(u >> 32));
193 }
194
195 #endif
196