1 /*- 2 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org> 3 * Copyright (c) 2005 Robert N. M. Watson 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * Derived from FreeBSD src/sys/sys/endian.h:1.6. 28 * $P4: //depot/projects/trustedbsd/openbsm/compat/endian.h#8 $ 29 */ 30 31 #ifndef _COMPAT_ENDIAN_H_ 32 #define _COMPAT_ENDIAN_H_ 33 34 /* 35 * Some systems will have the uint/int types defined here already, others 36 * will need stdint.h. 37 */ 38 #ifdef HAVE_STDINT_H 39 #include <stdint.h> 40 #endif 41 42 /* 43 * Some operating systems do not yet have the more recent endian APIs that 44 * permit encoding to and decoding from byte streams. For those systems, we 45 * implement local non-optimized versions. 46 */ 47 48 static __inline uint16_t 49 bswap16(uint16_t int16) 50 { 51 const unsigned char *from; 52 unsigned char *to; 53 uint16_t t; 54 55 from = (const unsigned char *) &int16; 56 to = (unsigned char *) &t; 57 58 to[0] = from[1]; 59 to[1] = from[0]; 60 61 return (t); 62 } 63 64 static __inline uint32_t 65 bswap32(uint32_t int32) 66 { 67 const unsigned char *from; 68 unsigned char *to; 69 uint32_t t; 70 71 from = (const unsigned char *) &int32; 72 to = (unsigned char *) &t; 73 74 to[0] = from[3]; 75 to[1] = from[2]; 76 to[2] = from[1]; 77 to[3] = from[0]; 78 79 return (t); 80 } 81 82 static __inline uint64_t 83 bswap64(uint64_t int64) 84 { 85 const unsigned char *from; 86 unsigned char *to; 87 uint64_t t; 88 89 from = (const unsigned char *) &int64; 90 to = (unsigned char *) &t; 91 92 to[0] = from[7]; 93 to[1] = from[6]; 94 to[2] = from[5]; 95 to[3] = from[4]; 96 to[4] = from[3]; 97 to[5] = from[2]; 98 to[6] = from[1]; 99 to[7] = from[0]; 100 101 return (t); 102 } 103 104 #if defined(BYTE_ORDER) && !defined(_BYTE_ORDER) 105 #define _BYTE_ORDER BYTE_ORDER 106 #endif 107 #if !defined(_BYTE_ORDER) 108 #error "Neither BYTE_ORDER nor _BYTE_ORDER defined" 109 #endif 110 111 #if defined(BIG_ENDIAN) && !defined(_BIG_ENDIAN) 112 #define _BIG_ENDIAN BIG_ENDIAN 113 #endif 114 115 #if defined(LITTLE_ENDIAN) && !defined(_LITTLE_ENDIAN) 116 #define _LITTLE_ENDIAN LITTLE_ENDIAN 117 #endif 118 119 /* 120 * Host to big endian, host to little endian, big endian to host, and little 121 * endian to host byte order functions as detailed in byteorder(9). 122 */ 123 #if _BYTE_ORDER == _LITTLE_ENDIAN 124 #define htobe16(x) bswap16((x)) 125 #define htobe32(x) bswap32((x)) 126 #define htobe64(x) bswap64((x)) 127 #define htole16(x) ((uint16_t)(x)) 128 #define htole32(x) ((uint32_t)(x)) 129 #define htole64(x) ((uint64_t)(x)) 130 131 #define be16toh(x) bswap16((x)) 132 #define be32toh(x) bswap32((x)) 133 #define be64toh(x) bswap64((x)) 134 #define le16toh(x) ((uint16_t)(x)) 135 #define le32toh(x) ((uint32_t)(x)) 136 #define le64toh(x) ((uint64_t)(x)) 137 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */ 138 #define htobe16(x) ((uint16_t)(x)) 139 #define htobe32(x) ((uint32_t)(x)) 140 #define htobe64(x) ((uint64_t)(x)) 141 #define htole16(x) bswap16((x)) 142 #define htole32(x) bswap32((x)) 143 #define htole64(x) bswap64((x)) 144 145 #define be16toh(x) ((uint16_t)(x)) 146 #define be32toh(x) ((uint32_t)(x)) 147 #define be64toh(x) ((uint64_t)(x)) 148 #define le16toh(x) bswap16((x)) 149 #define le32toh(x) bswap32((x)) 150 #define le64toh(x) bswap64((x)) 151 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */ 152 153 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ 154 155 static __inline uint16_t 156 be16dec(const void *pp) 157 { 158 unsigned char const *p = (unsigned char const *)pp; 159 160 return ((p[0] << 8) | p[1]); 161 } 162 163 static __inline uint32_t 164 be32dec(const void *pp) 165 { 166 unsigned char const *p = (unsigned char const *)pp; 167 168 return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); 169 } 170 171 static __inline uint64_t 172 be64dec(const void *pp) 173 { 174 unsigned char const *p = (unsigned char const *)pp; 175 176 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4)); 177 } 178 179 static __inline uint16_t 180 le16dec(const void *pp) 181 { 182 unsigned char const *p = (unsigned char const *)pp; 183 184 return ((p[1] << 8) | p[0]); 185 } 186 187 static __inline uint32_t 188 le32dec(const void *pp) 189 { 190 unsigned char const *p = (unsigned char const *)pp; 191 192 return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]); 193 } 194 195 static __inline uint64_t 196 le64dec(const void *pp) 197 { 198 unsigned char const *p = (unsigned char const *)pp; 199 200 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p)); 201 } 202 203 static __inline void 204 be16enc(void *pp, uint16_t u) 205 { 206 unsigned char *p = (unsigned char *)pp; 207 208 p[0] = (u >> 8) & 0xff; 209 p[1] = u & 0xff; 210 } 211 212 static __inline void 213 be32enc(void *pp, uint32_t u) 214 { 215 unsigned char *p = (unsigned char *)pp; 216 217 p[0] = (u >> 24) & 0xff; 218 p[1] = (u >> 16) & 0xff; 219 p[2] = (u >> 8) & 0xff; 220 p[3] = u & 0xff; 221 } 222 223 static __inline void 224 be64enc(void *pp, uint64_t u) 225 { 226 unsigned char *p = (unsigned char *)pp; 227 228 be32enc(p, u >> 32); 229 be32enc(p + 4, u & 0xffffffff); 230 } 231 232 static __inline void 233 le16enc(void *pp, uint16_t u) 234 { 235 unsigned char *p = (unsigned char *)pp; 236 237 p[0] = u & 0xff; 238 p[1] = (u >> 8) & 0xff; 239 } 240 241 static __inline void 242 le32enc(void *pp, uint32_t u) 243 { 244 unsigned char *p = (unsigned char *)pp; 245 246 p[0] = u & 0xff; 247 p[1] = (u >> 8) & 0xff; 248 p[2] = (u >> 16) & 0xff; 249 p[3] = (u >> 24) & 0xff; 250 } 251 252 static __inline void 253 le64enc(void *pp, uint64_t u) 254 { 255 unsigned char *p = (unsigned char *)pp; 256 257 le32enc(p, u & 0xffffffff); 258 le32enc(p + 4, u >> 32); 259 } 260 261 #endif /* _COMPAT_ENDIAN_H_ */ 262