1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 29 #ifndef _SYS_ENDIAN_H_ 30 #define _SYS_ENDIAN_H_ 31 32 #include <sys/cdefs.h> 33 #include <sys/_types.h> 34 #include <machine/endian.h> 35 36 #ifndef _UINT8_T_DECLARED 37 typedef __uint8_t uint8_t; 38 #define _UINT8_T_DECLARED 39 #endif 40 41 #ifndef _UINT16_T_DECLARED 42 typedef __uint16_t uint16_t; 43 #define _UINT16_T_DECLARED 44 #endif 45 46 #ifndef _UINT32_T_DECLARED 47 typedef __uint32_t uint32_t; 48 #define _UINT32_T_DECLARED 49 #endif 50 51 #ifndef _UINT64_T_DECLARED 52 typedef __uint64_t uint64_t; 53 #define _UINT64_T_DECLARED 54 #endif 55 56 /* 57 * Note: While tempting to try to avoid namespace pollution from this file, 58 * several software packages assume these marcos are defined, even when it 59 * defines _POSIX_C_SOURCE to request an unpolluted namespace. 60 */ 61 62 /* 63 * General byte order swapping functions. 64 */ 65 #define bswap16(x) __bswap16(x) 66 #define bswap32(x) __bswap32(x) 67 #define bswap64(x) __bswap64(x) 68 69 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ 70 static __inline uint16_t 71 be16dec(const void *pp) 72 { 73 uint8_t const *p = (uint8_t const *)pp; 74 75 return ((p[0] << 8) | p[1]); 76 } 77 78 static __inline uint32_t 79 be32dec(const void *pp) 80 { 81 uint8_t const *p = (uint8_t const *)pp; 82 83 return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); 84 } 85 86 static __inline uint64_t 87 be64dec(const void *pp) 88 { 89 uint8_t const *p = (uint8_t const *)pp; 90 91 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4)); 92 } 93 94 static __inline uint16_t 95 le16dec(const void *pp) 96 { 97 uint8_t const *p = (uint8_t const *)pp; 98 99 return ((p[1] << 8) | p[0]); 100 } 101 102 static __inline uint32_t 103 le32dec(const void *pp) 104 { 105 uint8_t const *p = (uint8_t const *)pp; 106 107 return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]); 108 } 109 110 static __inline uint64_t 111 le64dec(const void *pp) 112 { 113 uint8_t const *p = (uint8_t const *)pp; 114 115 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p)); 116 } 117 118 static __inline void 119 be16enc(void *pp, uint16_t u) 120 { 121 uint8_t *p = (uint8_t *)pp; 122 123 p[0] = (u >> 8) & 0xff; 124 p[1] = u & 0xff; 125 } 126 127 static __inline void 128 be32enc(void *pp, uint32_t u) 129 { 130 uint8_t *p = (uint8_t *)pp; 131 132 p[0] = (u >> 24) & 0xff; 133 p[1] = (u >> 16) & 0xff; 134 p[2] = (u >> 8) & 0xff; 135 p[3] = u & 0xff; 136 } 137 138 static __inline void 139 be64enc(void *pp, uint64_t u) 140 { 141 uint8_t *p = (uint8_t *)pp; 142 143 be32enc(p, (uint32_t)(u >> 32)); 144 be32enc(p + 4, (uint32_t)(u & 0xffffffffU)); 145 } 146 147 static __inline void 148 le16enc(void *pp, uint16_t u) 149 { 150 uint8_t *p = (uint8_t *)pp; 151 152 p[0] = u & 0xff; 153 p[1] = (u >> 8) & 0xff; 154 } 155 156 static __inline void 157 le32enc(void *pp, uint32_t u) 158 { 159 uint8_t *p = (uint8_t *)pp; 160 161 p[0] = u & 0xff; 162 p[1] = (u >> 8) & 0xff; 163 p[2] = (u >> 16) & 0xff; 164 p[3] = (u >> 24) & 0xff; 165 } 166 167 static __inline void 168 le64enc(void *pp, uint64_t u) 169 { 170 uint8_t *p = (uint8_t *)pp; 171 172 le32enc(p, (uint32_t)(u & 0xffffffffU)); 173 le32enc(p + 4, (uint32_t)(u >> 32)); 174 } 175 #endif /* _SYS_ENDIAN_H_ */ 176