1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright 2018-2020 Alex Richardson <arichardson@FreeBSD.org>
5 *
6 * This software was developed by SRI International and the University of
7 * Cambridge Computer Laboratory (Department of Computer Science and
8 * Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the
9 * DARPA SSITH research programme.
10 *
11 * This software was developed by SRI International and the University of
12 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
13 * ("CTSRD"), as part of the DARPA CRASH research programme.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36 #pragma once
37
38 #if __has_include_next(<sys/endian.h>)
39 #include_next <sys/endian.h>
40 #endif
41
42 #if __has_include(<endian.h>)
43 #include <endian.h>
44 #endif
45
46 /* Linux uses a double underscore, FreeBSD a single one */
47 #define _LITTLE_ENDIAN __LITTLE_ENDIAN
48 #define _BIG_ENDIAN __BIG_ENDIAN
49 #define _BYTE_ORDER __BYTE_ORDER
50
51 /*
52 * Ensure all these are constant expressions (which is not the case for some
53 * of the glibc versions depending on compiler optimization level)
54 */
55
56 #undef bswap64
57 #define bswap64(a) __builtin_bswap64(a)
58
59 #undef bswap32
60 #define bswap32(a) __builtin_bswap32(a)
61
62 #undef bswap16
63 #define bswap16(a) __builtin_bswap16(a)
64
65 #undef __bswap_64
66 #define __bswap_64(a) __builtin_bswap64(a)
67
68 #undef __bswap_32
69 #define __bswap_32(a) __builtin_bswap32(a)
70
71 #undef __bswap_16
72 #define __bswap_16(a) __builtin_bswap16(a)
73
74 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
75
76 static __inline uint16_t
be16dec(const void * pp)77 be16dec(const void *pp)
78 {
79 uint8_t const *p = (uint8_t const *)pp;
80
81 return ((p[0] << 8) | p[1]);
82 }
83
84 static __inline uint32_t
be32dec(const void * pp)85 be32dec(const void *pp)
86 {
87 uint8_t const *p = (uint8_t const *)pp;
88
89 return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
90 }
91
92 static __inline uint64_t
be64dec(const void * pp)93 be64dec(const void *pp)
94 {
95 uint8_t const *p = (uint8_t const *)pp;
96
97 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
98 }
99
100 static __inline uint16_t
le16dec(const void * pp)101 le16dec(const void *pp)
102 {
103 uint8_t const *p = (uint8_t const *)pp;
104
105 return ((p[1] << 8) | p[0]);
106 }
107
108 static __inline uint32_t
le32dec(const void * pp)109 le32dec(const void *pp)
110 {
111 uint8_t const *p = (uint8_t const *)pp;
112
113 return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
114 }
115
116 static __inline uint64_t
le64dec(const void * pp)117 le64dec(const void *pp)
118 {
119 uint8_t const *p = (uint8_t const *)pp;
120
121 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
122 }
123
124 static __inline void
be16enc(void * pp,uint16_t u)125 be16enc(void *pp, uint16_t u)
126 {
127 uint8_t *p = (uint8_t *)pp;
128
129 p[0] = (u >> 8) & 0xff;
130 p[1] = u & 0xff;
131 }
132
133 static __inline void
be32enc(void * pp,uint32_t u)134 be32enc(void *pp, uint32_t u)
135 {
136 uint8_t *p = (uint8_t *)pp;
137
138 p[0] = (u >> 24) & 0xff;
139 p[1] = (u >> 16) & 0xff;
140 p[2] = (u >> 8) & 0xff;
141 p[3] = u & 0xff;
142 }
143
144 static __inline void
be64enc(void * pp,uint64_t u)145 be64enc(void *pp, uint64_t u)
146 {
147 uint8_t *p = (uint8_t *)pp;
148
149 be32enc(p, (uint32_t)(u >> 32));
150 be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
151 }
152
153 static __inline void
le16enc(void * pp,uint16_t u)154 le16enc(void *pp, uint16_t u)
155 {
156 uint8_t *p = (uint8_t *)pp;
157
158 p[0] = u & 0xff;
159 p[1] = (u >> 8) & 0xff;
160 }
161
162 static __inline void
le32enc(void * pp,uint32_t u)163 le32enc(void *pp, uint32_t u)
164 {
165 uint8_t *p = (uint8_t *)pp;
166
167 p[0] = u & 0xff;
168 p[1] = (u >> 8) & 0xff;
169 p[2] = (u >> 16) & 0xff;
170 p[3] = (u >> 24) & 0xff;
171 }
172
173 static __inline void
le64enc(void * pp,uint64_t u)174 le64enc(void *pp, uint64_t u)
175 {
176 uint8_t *p = (uint8_t *)pp;
177
178 le32enc(p, (uint32_t)(u & 0xffffffffU));
179 le32enc(p + 4, (uint32_t)(u >> 32));
180 }
181