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 * Note: While tempting to try to avoid namespace pollution from this file, 60 * several software packages assume these marcos are defined, even when it 61 * defines _POSIX_C_SOURCE to request an unpolluted namespace. 62 */ 63 64 /* 65 * General byte order swapping functions. 66 */ 67 #define bswap16(x) __bswap16(x) 68 #define bswap32(x) __bswap32(x) 69 #define bswap64(x) __bswap64(x) 70 71 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ 72 static __inline uint16_t 73 be16dec(const void *pp) 74 { 75 uint8_t const *p = (uint8_t const *)pp; 76 77 return ((p[0] << 8) | p[1]); 78 } 79 80 static __inline uint32_t 81 be32dec(const void *pp) 82 { 83 uint8_t const *p = (uint8_t const *)pp; 84 85 return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); 86 } 87 88 static __inline uint64_t 89 be64dec(const void *pp) 90 { 91 uint8_t const *p = (uint8_t const *)pp; 92 93 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4)); 94 } 95 96 static __inline uint16_t 97 le16dec(const void *pp) 98 { 99 uint8_t const *p = (uint8_t const *)pp; 100 101 return ((p[1] << 8) | p[0]); 102 } 103 104 static __inline uint32_t 105 le32dec(const void *pp) 106 { 107 uint8_t const *p = (uint8_t const *)pp; 108 109 return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]); 110 } 111 112 static __inline uint64_t 113 le64dec(const void *pp) 114 { 115 uint8_t const *p = (uint8_t const *)pp; 116 117 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p)); 118 } 119 120 static __inline void 121 be16enc(void *pp, uint16_t u) 122 { 123 uint8_t *p = (uint8_t *)pp; 124 125 p[0] = (u >> 8) & 0xff; 126 p[1] = u & 0xff; 127 } 128 129 static __inline void 130 be32enc(void *pp, uint32_t u) 131 { 132 uint8_t *p = (uint8_t *)pp; 133 134 p[0] = (u >> 24) & 0xff; 135 p[1] = (u >> 16) & 0xff; 136 p[2] = (u >> 8) & 0xff; 137 p[3] = u & 0xff; 138 } 139 140 static __inline void 141 be64enc(void *pp, uint64_t u) 142 { 143 uint8_t *p = (uint8_t *)pp; 144 145 be32enc(p, (uint32_t)(u >> 32)); 146 be32enc(p + 4, (uint32_t)(u & 0xffffffffU)); 147 } 148 149 static __inline void 150 le16enc(void *pp, uint16_t u) 151 { 152 uint8_t *p = (uint8_t *)pp; 153 154 p[0] = u & 0xff; 155 p[1] = (u >> 8) & 0xff; 156 } 157 158 static __inline void 159 le32enc(void *pp, uint32_t u) 160 { 161 uint8_t *p = (uint8_t *)pp; 162 163 p[0] = u & 0xff; 164 p[1] = (u >> 8) & 0xff; 165 p[2] = (u >> 16) & 0xff; 166 p[3] = (u >> 24) & 0xff; 167 } 168 169 static __inline void 170 le64enc(void *pp, uint64_t u) 171 { 172 uint8_t *p = (uint8_t *)pp; 173 174 le32enc(p, (uint32_t)(u & 0xffffffffU)); 175 le32enc(p + 4, (uint32_t)(u >> 32)); 176 } 177 #endif /* _SYS_ENDIAN_H_ */ 178