1 /* $NetBSD: byteorder.c,v 1.2 2001/10/31 20:19:52 thorpej Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include "byteorder.h" 39 40 typedef union { 41 uint16_t val; 42 uint8_t bytes[2]; 43 } un16; 44 45 typedef union { 46 uint32_t val; 47 uint8_t bytes[4]; 48 } un32; 49 50 typedef union { 51 uint64_t val; 52 uint32_t words[2]; 53 } un64; 54 55 /* 16-bit */ 56 57 uint16_t 58 sa_htobe16(uint16_t val) 59 { 60 un16 un; 61 62 un.bytes[1] = val & 0xff; 63 un.bytes[0] = (val >> 8) & 0xff; 64 65 return (un.val); 66 } 67 68 uint16_t 69 sa_htole16(uint16_t val) 70 { 71 un16 un; 72 73 un.bytes[0] = val & 0xff; 74 un.bytes[1] = (val >> 8) & 0xff; 75 76 return (un.val); 77 } 78 79 uint16_t 80 sa_be16toh(uint16_t val) 81 { 82 un16 un; 83 84 un.val = val; 85 86 return ((un.bytes[0] << 8) | 87 un.bytes[1]); 88 } 89 90 uint16_t 91 sa_le16toh(uint16_t val) 92 { 93 un16 un; 94 95 un.val = val; 96 97 return ((un.bytes[1] << 8) | 98 un.bytes[0]); 99 } 100 101 /* 32-bit */ 102 103 uint32_t 104 sa_htobe32(uint32_t val) 105 { 106 un32 un; 107 108 un.bytes[3] = val & 0xff; 109 un.bytes[2] = (val >> 8) & 0xff; 110 un.bytes[1] = (val >> 16) & 0xff; 111 un.bytes[0] = (val >> 24) & 0xff; 112 113 return (un.val); 114 } 115 116 uint32_t 117 sa_htole32(uint32_t val) 118 { 119 un32 un; 120 121 un.bytes[0] = val & 0xff; 122 un.bytes[1] = (val >> 8) & 0xff; 123 un.bytes[2] = (val >> 16) & 0xff; 124 un.bytes[3] = (val >> 24) & 0xff; 125 126 return (un.val); 127 } 128 129 uint32_t 130 sa_be32toh(uint32_t val) 131 { 132 un32 un; 133 134 un.val = val; 135 136 return ((un.bytes[0] << 24) | 137 (un.bytes[1] << 16) | 138 (un.bytes[2] << 8) | 139 un.bytes[3]); 140 } 141 142 uint32_t 143 sa_le32toh(uint32_t val) 144 { 145 un32 un; 146 147 un.val = val; 148 149 return ((un.bytes[3] << 24) | 150 (un.bytes[2] << 16) | 151 (un.bytes[1] << 8) | 152 un.bytes[0]); 153 } 154 155 /* 64-bit */ 156 157 uint64_t 158 sa_htobe64(uint64_t val) 159 { 160 un64 un; 161 162 un.words[BE64_HI] = sa_htobe32(val >> 32); 163 un.words[BE64_LO] = sa_htobe32(val & 0xffffffffU); 164 165 return (un.val); 166 } 167 168 uint64_t 169 sa_htole64(uint64_t val) 170 { 171 un64 un; 172 173 un.words[LE64_HI] = sa_htole32(val >> 32); 174 un.words[LE64_LO] = sa_htole32(val & 0xffffffffU); 175 176 return (un.val); 177 } 178 179 uint64_t 180 sa_be64toh(uint64_t val) 181 { 182 un64 un; 183 uint64_t rv; 184 185 un.val = val; 186 un.words[BE64_HI] = sa_be32toh(un.words[BE64_HI]); 187 un.words[BE64_LO] = sa_be32toh(un.words[BE64_LO]); 188 189 rv = (((uint64_t)un.words[BE64_HI]) << 32) | 190 un.words[BE64_LO]; 191 192 return (rv); 193 } 194 195 uint64_t 196 sa_le64toh(uint64_t val) 197 { 198 un64 un; 199 uint64_t rv; 200 201 un.val = val; 202 un.words[LE64_HI] = sa_le32toh(un.words[LE64_HI]); 203 un.words[LE64_LO] = sa_le32toh(un.words[LE64_LO]); 204 205 rv = (((uint64_t)un.words[LE64_HI]) << 32) | 206 un.words[LE64_LO]; 207 208 return (rv); 209 } 210