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
76static __inline uint16_t
77be16dec(const void *pp)
78{
79	uint8_t const *p = (uint8_t const *)pp;
80
81	return ((p[0] << 8) | p[1]);
82}
83
84static __inline uint32_t
85be32dec(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
92static __inline uint64_t
93be64dec(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
100static __inline uint16_t
101le16dec(const void *pp)
102{
103	uint8_t const *p = (uint8_t const *)pp;
104
105	return ((p[1] << 8) | p[0]);
106}
107
108static __inline uint32_t
109le32dec(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
116static __inline uint64_t
117le64dec(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
124static __inline void
125be16enc(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
133static __inline void
134be32enc(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
144static __inline void
145be64enc(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
153static __inline void
154le16enc(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
162static __inline void
163le32enc(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
173static __inline void
174le64enc(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