1 /*-
2 * Copyright 2007-2009 Colin Percival
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 * This file was originally written by Colin Percival as part of the Tarsnap
27 * online backup system.
28 */
29 #ifndef _SYSENDIAN_H_
30 #define _SYSENDIAN_H_
31
32 #include "scrypt_platform.h"
33
34 /* If we don't have be64enc, the <sys/endian.h> we have isn't usable. */
35 #if !HAVE_DECL_BE64ENC
36 #undef HAVE_SYS_ENDIAN_H
37 #endif
38
39 #ifdef HAVE_SYS_ENDIAN_H
40
41 #include <sys/endian.h>
42
43 #else
44
45 #include <stdint.h>
46
47 static inline uint32_t
be32dec(const void * pp)48 be32dec(const void *pp)
49 {
50 const uint8_t *p = (uint8_t const *)pp;
51
52 return ((uint32_t)(p[3]) + ((uint32_t)(p[2]) << 8) +
53 ((uint32_t)(p[1]) << 16) + ((uint32_t)(p[0]) << 24));
54 }
55
56 static inline void
be32enc(void * pp,uint32_t x)57 be32enc(void *pp, uint32_t x)
58 {
59 uint8_t * p = (uint8_t *)pp;
60
61 p[3] = x & 0xff;
62 p[2] = (x >> 8) & 0xff;
63 p[1] = (x >> 16) & 0xff;
64 p[0] = (x >> 24) & 0xff;
65 }
66
67 static inline uint64_t
be64dec(const void * pp)68 be64dec(const void *pp)
69 {
70 const uint8_t *p = (uint8_t const *)pp;
71
72 return ((uint64_t)(p[7]) + ((uint64_t)(p[6]) << 8) +
73 ((uint64_t)(p[5]) << 16) + ((uint64_t)(p[4]) << 24) +
74 ((uint64_t)(p[3]) << 32) + ((uint64_t)(p[2]) << 40) +
75 ((uint64_t)(p[1]) << 48) + ((uint64_t)(p[0]) << 56));
76 }
77
78 static inline void
be64enc(void * pp,uint64_t x)79 be64enc(void *pp, uint64_t x)
80 {
81 uint8_t * p = (uint8_t *)pp;
82
83 p[7] = x & 0xff;
84 p[6] = (x >> 8) & 0xff;
85 p[5] = (x >> 16) & 0xff;
86 p[4] = (x >> 24) & 0xff;
87 p[3] = (x >> 32) & 0xff;
88 p[2] = (x >> 40) & 0xff;
89 p[1] = (x >> 48) & 0xff;
90 p[0] = (x >> 56) & 0xff;
91 }
92
93 static inline uint32_t
le32dec(const void * pp)94 le32dec(const void *pp)
95 {
96 const uint8_t *p = (uint8_t const *)pp;
97
98 return ((uint32_t)(p[0]) + ((uint32_t)(p[1]) << 8) +
99 ((uint32_t)(p[2]) << 16) + ((uint32_t)(p[3]) << 24));
100 }
101
102 static inline void
le32enc(void * pp,uint32_t x)103 le32enc(void *pp, uint32_t x)
104 {
105 uint8_t * p = (uint8_t *)pp;
106
107 p[0] = x & 0xff;
108 p[1] = (x >> 8) & 0xff;
109 p[2] = (x >> 16) & 0xff;
110 p[3] = (x >> 24) & 0xff;
111 }
112
113 static inline uint64_t
le64dec(const void * pp)114 le64dec(const void *pp)
115 {
116 const uint8_t *p = (uint8_t const *)pp;
117
118 return ((uint64_t)(p[0]) + ((uint64_t)(p[1]) << 8) +
119 ((uint64_t)(p[2]) << 16) + ((uint64_t)(p[3]) << 24) +
120 ((uint64_t)(p[4]) << 32) + ((uint64_t)(p[5]) << 40) +
121 ((uint64_t)(p[6]) << 48) + ((uint64_t)(p[7]) << 56));
122 }
123
124 static inline void
le64enc(void * pp,uint64_t x)125 le64enc(void *pp, uint64_t x)
126 {
127 uint8_t * p = (uint8_t *)pp;
128
129 p[0] = x & 0xff;
130 p[1] = (x >> 8) & 0xff;
131 p[2] = (x >> 16) & 0xff;
132 p[3] = (x >> 24) & 0xff;
133 p[4] = (x >> 32) & 0xff;
134 p[5] = (x >> 40) & 0xff;
135 p[6] = (x >> 48) & 0xff;
136 p[7] = (x >> 56) & 0xff;
137 }
138 #endif /* !HAVE_SYS_ENDIAN_H */
139
140 #endif /* !_SYSENDIAN_H_ */
141