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 * $FreeBSD$ 37 */ 38 #pragma once 39 40 #if __has_include_next(<sys/endian.h>) 41 #include_next <sys/endian.h> 42 #endif 43 44 #if __has_include(<endian.h>) 45 #include <endian.h> 46 #endif 47 48 /* Linux uses a double underscore, FreeBSD a single one */ 49 #define _LITTLE_ENDIAN __LITTLE_ENDIAN 50 #define _BIG_ENDIAN __BIG_ENDIAN 51 #define _BYTE_ORDER __BYTE_ORDER 52 53 /* 54 * Ensure all these are constant expressions (which is not the case for some 55 * of the glibc versions depending on compiler optimization level) 56 */ 57 58 #undef bswap64 59 #define bswap64(a) __builtin_bswap64(a) 60 61 #undef bswap32 62 #define bswap32(a) __builtin_bswap32(a) 63 64 #undef bswap16 65 #define bswap16(a) __builtin_bswap16(a) 66 67 #undef __bswap_64 68 #define __bswap_64(a) __builtin_bswap64(a) 69 70 #undef __bswap_32 71 #define __bswap_32(a) __builtin_bswap32(a) 72 73 #undef __bswap_16 74 #define __bswap_16(a) __builtin_bswap16(a) 75 76 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ 77 78 static __inline uint16_t 79 be16dec(const void *pp) 80 { 81 uint8_t const *p = (uint8_t const *)pp; 82 83 return ((p[0] << 8) | p[1]); 84 } 85 86 static __inline uint32_t 87 be32dec(const void *pp) 88 { 89 uint8_t const *p = (uint8_t const *)pp; 90 91 return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); 92 } 93 94 static __inline uint64_t 95 be64dec(const void *pp) 96 { 97 uint8_t const *p = (uint8_t const *)pp; 98 99 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4)); 100 } 101 102 static __inline uint16_t 103 le16dec(const void *pp) 104 { 105 uint8_t const *p = (uint8_t const *)pp; 106 107 return ((p[1] << 8) | p[0]); 108 } 109 110 static __inline uint32_t 111 le32dec(const void *pp) 112 { 113 uint8_t const *p = (uint8_t const *)pp; 114 115 return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]); 116 } 117 118 static __inline uint64_t 119 le64dec(const void *pp) 120 { 121 uint8_t const *p = (uint8_t const *)pp; 122 123 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p)); 124 } 125 126 static __inline void 127 be16enc(void *pp, uint16_t u) 128 { 129 uint8_t *p = (uint8_t *)pp; 130 131 p[0] = (u >> 8) & 0xff; 132 p[1] = u & 0xff; 133 } 134 135 static __inline void 136 be32enc(void *pp, uint32_t u) 137 { 138 uint8_t *p = (uint8_t *)pp; 139 140 p[0] = (u >> 24) & 0xff; 141 p[1] = (u >> 16) & 0xff; 142 p[2] = (u >> 8) & 0xff; 143 p[3] = u & 0xff; 144 } 145 146 static __inline void 147 be64enc(void *pp, uint64_t u) 148 { 149 uint8_t *p = (uint8_t *)pp; 150 151 be32enc(p, (uint32_t)(u >> 32)); 152 be32enc(p + 4, (uint32_t)(u & 0xffffffffU)); 153 } 154 155 static __inline void 156 le16enc(void *pp, uint16_t u) 157 { 158 uint8_t *p = (uint8_t *)pp; 159 160 p[0] = u & 0xff; 161 p[1] = (u >> 8) & 0xff; 162 } 163 164 static __inline void 165 le32enc(void *pp, uint32_t u) 166 { 167 uint8_t *p = (uint8_t *)pp; 168 169 p[0] = u & 0xff; 170 p[1] = (u >> 8) & 0xff; 171 p[2] = (u >> 16) & 0xff; 172 p[3] = (u >> 24) & 0xff; 173 } 174 175 static __inline void 176 le64enc(void *pp, uint64_t u) 177 { 178 uint8_t *p = (uint8_t *)pp; 179 180 le32enc(p, (uint32_t)(u & 0xffffffffU)); 181 le32enc(p + 4, (uint32_t)(u >> 32)); 182 } 183