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 76 static __inline uint16_t 77 be16dec(const void *pp) 78 { 79 uint8_t const *p = (uint8_t const *)pp; 80 81 return ((p[0] << 8) | p[1]); 82 } 83 84 static __inline uint32_t 85 be32dec(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 92 static __inline uint64_t 93 be64dec(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 } 99 100 static __inline uint16_t 101 le16dec(const void *pp) 102 { 103 uint8_t const *p = (uint8_t const *)pp; 104 105 return ((p[1] << 8) | p[0]); 106 } 107 108 static __inline uint32_t 109 le32dec(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 } 115 116 static __inline uint64_t 117 le64dec(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 } 123 124 static __inline void 125 be16enc(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 } 132 133 static __inline void 134 be32enc(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 } 143 144 static __inline void 145 be64enc(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 } 152 153 static __inline void 154 le16enc(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 } 161 162 static __inline void 163 le32enc(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 } 172 173 static __inline void 174 le64enc(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