1 /*
2 * All the code below is a rework of
3 * https://github.com/freebsd/freebsd/blob/master/sys/sys/endian.h
4 * to import symbols defining non-standard endian handling functions.
5 * The aforementioned source code license terms are included here.
6 * For further license info, please look at https://github.com/freebsd/freebsd
7 */
8
9 /*-
10 * SPDX-FileCopyrightText: 2018-2021 Espressif Systems (Shanghai) CO LTD
11 * SPDX-FileCopyrightText: 2020 Francesco Giancane <francesco.giancane@accenture.com>
12 * SPDX-FileCopyrightText: 2002 Thomas Moestl <tmm@FreeBSD.org>
13 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD AND Apache-2.0
14 *
15 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
16 * All rights reserved.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
21 * 1. Redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer.
23 * 2. Redistributions in binary form must reproduce the above copyright
24 * notice, this list of conditions and the following disclaimer in the
25 * documentation and/or other materials provided with the distribution.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 * $FreeBSD$
40 */
41
42 #pragma once
43
44 #include <stdint.h>
45
46 /*
47 * This is a compatibility header for <endian.h>.
48 * In xtensa-newlib distribution it is located in <machine/endian.h>
49 * but most program expect to be plain <endian.h>.
50 */
51 #include <machine/endian.h>
52
53 #ifdef __cplusplus
54 extern "C" {
55 #endif
56
57 /*
58 * General byte order swapping functions.
59 */
60 #define bswap16(x) __bswap16(x)
61 #define bswap32(x) __bswap32(x)
62 #define bswap64(x) __bswap64(x)
63
64 /*
65 * Host to big endian, host to little endian, big endian to host, and little
66 * endian to host byte order functions as detailed in byteorder(9).
67 */
68 #if _BYTE_ORDER == _LITTLE_ENDIAN
69 #define htobe16(x) bswap16((x))
70 #define htobe32(x) bswap32((x))
71 #define htobe64(x) bswap64((x))
72 #define htole16(x) ((uint16_t)(x))
73 #define htole32(x) ((uint32_t)(x))
74 #define htole64(x) ((uint64_t)(x))
75
76 #define be16toh(x) bswap16((x))
77 #define be32toh(x) bswap32((x))
78 #define be64toh(x) bswap64((x))
79 #define le16toh(x) ((uint16_t)(x))
80 #define le32toh(x) ((uint32_t)(x))
81 #define le64toh(x) ((uint64_t)(x))
82 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */
83 #define htobe16(x) ((uint16_t)(x))
84 #define htobe32(x) ((uint32_t)(x))
85 #define htobe64(x) ((uint64_t)(x))
86 #define htole16(x) bswap16((x))
87 #define htole32(x) bswap32((x))
88 #define htole64(x) bswap64((x))
89
90 #define be16toh(x) ((uint16_t)(x))
91 #define be32toh(x) ((uint32_t)(x))
92 #define be64toh(x) ((uint64_t)(x))
93 #define le16toh(x) bswap16((x))
94 #define le32toh(x) bswap32((x))
95 #define le64toh(x) bswap64((x))
96 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
97
98 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
99
100 static __inline uint16_t
be16dec(const void * pp)101 be16dec(const void *pp)
102 {
103 uint8_t const *p = (uint8_t const *)pp;
104
105 return ((p[0] << 8) | p[1]);
106 }
107
108 static __inline uint32_t
be32dec(const void * pp)109 be32dec(const void *pp)
110 {
111 uint8_t const *p = (uint8_t const *)pp;
112
113 return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
114 }
115
116 static __inline uint64_t
be64dec(const void * pp)117 be64dec(const void *pp)
118 {
119 uint8_t const *p = (uint8_t const *)pp;
120
121 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
122 }
123
124 static __inline uint16_t
le16dec(const void * pp)125 le16dec(const void *pp)
126 {
127 uint8_t const *p = (uint8_t const *)pp;
128
129 return ((p[1] << 8) | p[0]);
130 }
131
132 static __inline uint32_t
le32dec(const void * pp)133 le32dec(const void *pp)
134 {
135 uint8_t const *p = (uint8_t const *)pp;
136
137 return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
138 }
139
140 static __inline uint64_t
le64dec(const void * pp)141 le64dec(const void *pp)
142 {
143 uint8_t const *p = (uint8_t const *)pp;
144
145 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
146 }
147
148 static __inline void
be16enc(void * pp,uint16_t u)149 be16enc(void *pp, uint16_t u)
150 {
151 uint8_t *p = (uint8_t *)pp;
152
153 p[0] = (u >> 8) & 0xff;
154 p[1] = u & 0xff;
155 }
156
157 static __inline void
be32enc(void * pp,uint32_t u)158 be32enc(void *pp, uint32_t u)
159 {
160 uint8_t *p = (uint8_t *)pp;
161
162 p[0] = (u >> 24) & 0xff;
163 p[1] = (u >> 16) & 0xff;
164 p[2] = (u >> 8) & 0xff;
165 p[3] = u & 0xff;
166 }
167
168 static __inline void
be64enc(void * pp,uint64_t u)169 be64enc(void *pp, uint64_t u)
170 {
171 uint8_t *p = (uint8_t *)pp;
172
173 be32enc(p, (uint32_t)(u >> 32));
174 be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
175 }
176
177 static __inline void
le16enc(void * pp,uint16_t u)178 le16enc(void *pp, uint16_t u)
179 {
180 uint8_t *p = (uint8_t *)pp;
181
182 p[0] = u & 0xff;
183 p[1] = (u >> 8) & 0xff;
184 }
185
186 static __inline void
le32enc(void * pp,uint32_t u)187 le32enc(void *pp, uint32_t u)
188 {
189 uint8_t *p = (uint8_t *)pp;
190
191 p[0] = u & 0xff;
192 p[1] = (u >> 8) & 0xff;
193 p[2] = (u >> 16) & 0xff;
194 p[3] = (u >> 24) & 0xff;
195 }
196
197 static __inline void
le64enc(void * pp,uint64_t u)198 le64enc(void *pp, uint64_t u)
199 {
200 uint8_t *p = (uint8_t *)pp;
201
202 le32enc(p, (uint32_t)(u & 0xffffffffU));
203 le32enc(p + 4, (uint32_t)(u >> 32));
204 }
205
206 #ifdef __cplusplus
207 }
208 #endif
209
