1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #ifndef _SYS_ENDIAN_H_ 32 #define _SYS_ENDIAN_H_ 33 34 #include <sys/cdefs.h> 35 #include <sys/_types.h> 36 #include <machine/endian.h> 37 38 #ifndef _UINT8_T_DECLARED 39 typedef __uint8_t uint8_t; 40 #define _UINT8_T_DECLARED 41 #endif 42 43 #ifndef _UINT16_T_DECLARED 44 typedef __uint16_t uint16_t; 45 #define _UINT16_T_DECLARED 46 #endif 47 48 #ifndef _UINT32_T_DECLARED 49 typedef __uint32_t uint32_t; 50 #define _UINT32_T_DECLARED 51 #endif 52 53 #ifndef _UINT64_T_DECLARED 54 typedef __uint64_t uint64_t; 55 #define _UINT64_T_DECLARED 56 #endif 57 58 /* 59 * General byte order swapping functions. 60 */ 61 #define bswap16(x) __bswap16(x) 62 #define bswap32(x) __bswap32(x) 63 #define bswap64(x) __bswap64(x) 64 65 /* 66 * Host to big endian, host to little endian, big endian to host, and little 67 * endian to host byte order functions as detailed in byteorder(9). 68 */ 69 #if _BYTE_ORDER == _LITTLE_ENDIAN 70 #define htobe16(x) bswap16((x)) 71 #define htobe32(x) bswap32((x)) 72 #define htobe64(x) bswap64((x)) 73 #define htole16(x) ((uint16_t)(x)) 74 #define htole32(x) ((uint32_t)(x)) 75 #define htole64(x) ((uint64_t)(x)) 76 77 #define be16toh(x) bswap16((x)) 78 #define be32toh(x) bswap32((x)) 79 #define be64toh(x) bswap64((x)) 80 #define le16toh(x) ((uint16_t)(x)) 81 #define le32toh(x) ((uint32_t)(x)) 82 #define le64toh(x) ((uint64_t)(x)) 83 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */ 84 #define htobe16(x) ((uint16_t)(x)) 85 #define htobe32(x) ((uint32_t)(x)) 86 #define htobe64(x) ((uint64_t)(x)) 87 #define htole16(x) bswap16((x)) 88 #define htole32(x) bswap32((x)) 89 #define htole64(x) bswap64((x)) 90 91 #define be16toh(x) ((uint16_t)(x)) 92 #define be32toh(x) ((uint32_t)(x)) 93 #define be64toh(x) ((uint64_t)(x)) 94 #define le16toh(x) bswap16((x)) 95 #define le32toh(x) bswap32((x)) 96 #define le64toh(x) bswap64((x)) 97 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */ 98 99 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ 100 101 static __inline uint16_t 102 be16dec(const void *pp) 103 { 104 uint8_t const *p = (uint8_t const *)pp; 105 106 return ((p[0] << 8) | p[1]); 107 } 108 109 static __inline uint32_t 110 be32dec(const void *pp) 111 { 112 uint8_t const *p = (uint8_t const *)pp; 113 114 return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); 115 } 116 117 static __inline uint64_t 118 be64dec(const void *pp) 119 { 120 uint8_t const *p = (uint8_t const *)pp; 121 122 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4)); 123 } 124 125 static __inline uint16_t 126 le16dec(const void *pp) 127 { 128 uint8_t const *p = (uint8_t const *)pp; 129 130 return ((p[1] << 8) | p[0]); 131 } 132 133 static __inline uint32_t 134 le32dec(const void *pp) 135 { 136 uint8_t const *p = (uint8_t const *)pp; 137 138 return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]); 139 } 140 141 static __inline uint64_t 142 le64dec(const void *pp) 143 { 144 uint8_t const *p = (uint8_t const *)pp; 145 146 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p)); 147 } 148 149 static __inline void 150 be16enc(void *pp, uint16_t u) 151 { 152 uint8_t *p = (uint8_t *)pp; 153 154 p[0] = (u >> 8) & 0xff; 155 p[1] = u & 0xff; 156 } 157 158 static __inline void 159 be32enc(void *pp, uint32_t u) 160 { 161 uint8_t *p = (uint8_t *)pp; 162 163 p[0] = (u >> 24) & 0xff; 164 p[1] = (u >> 16) & 0xff; 165 p[2] = (u >> 8) & 0xff; 166 p[3] = u & 0xff; 167 } 168 169 static __inline void 170 be64enc(void *pp, uint64_t u) 171 { 172 uint8_t *p = (uint8_t *)pp; 173 174 be32enc(p, (uint32_t)(u >> 32)); 175 be32enc(p + 4, (uint32_t)(u & 0xffffffffU)); 176 } 177 178 static __inline void 179 le16enc(void *pp, uint16_t u) 180 { 181 uint8_t *p = (uint8_t *)pp; 182 183 p[0] = u & 0xff; 184 p[1] = (u >> 8) & 0xff; 185 } 186 187 static __inline void 188 le32enc(void *pp, uint32_t u) 189 { 190 uint8_t *p = (uint8_t *)pp; 191 192 p[0] = u & 0xff; 193 p[1] = (u >> 8) & 0xff; 194 p[2] = (u >> 16) & 0xff; 195 p[3] = (u >> 24) & 0xff; 196 } 197 198 static __inline void 199 le64enc(void *pp, uint64_t u) 200 { 201 uint8_t *p = (uint8_t *)pp; 202 203 le32enc(p, (uint32_t)(u & 0xffffffffU)); 204 le32enc(p + 4, (uint32_t)(u >> 32)); 205 } 206 207 #endif /* _SYS_ENDIAN_H_ */ 208