| 1 | /* $NetBSD: endian.h,v 1.30 2016/02/27 21:37:35 christos Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1987, 1991, 1993 |
| 5 | * The Regents of the University of California. 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 | * 3. Neither the name of the University nor the names of its contributors |
| 16 | * may be used to endorse or promote products derived from this software |
| 17 | * without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 29 | * SUCH DAMAGE. |
| 30 | * |
| 31 | * @(#)endian.h 8.1 (Berkeley) 6/11/93 |
| 32 | */ |
| 33 | |
| 34 | #ifndef _SYS_ENDIAN_H_ |
| 35 | #define _SYS_ENDIAN_H_ |
| 36 | |
| 37 | #include <sys/featuretest.h> |
| 38 | |
| 39 | /* |
| 40 | * Definitions for byte order, according to byte significance from low |
| 41 | * address to high. |
| 42 | */ |
| 43 | #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ |
| 44 | #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ |
| 45 | #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ |
| 46 | |
| 47 | |
| 48 | #if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE) |
| 49 | #ifndef _LOCORE |
| 50 | |
| 51 | /* C-family endian-ness definitions */ |
| 52 | |
| 53 | #include <sys/ansi.h> |
| 54 | #include <sys/cdefs.h> |
| 55 | #include <sys/types.h> |
| 56 | |
| 57 | #ifndef in_addr_t |
| 58 | typedef __in_addr_t in_addr_t; |
| 59 | #define in_addr_t __in_addr_t |
| 60 | #endif |
| 61 | |
| 62 | #ifndef in_port_t |
| 63 | typedef __in_port_t in_port_t; |
| 64 | #define in_port_t __in_port_t |
| 65 | #endif |
| 66 | |
| 67 | __BEGIN_DECLS |
| 68 | uint32_t htonl(uint32_t) __constfunc; |
| 69 | uint16_t htons(uint16_t) __constfunc; |
| 70 | uint32_t ntohl(uint32_t) __constfunc; |
| 71 | uint16_t ntohs(uint16_t) __constfunc; |
| 72 | __END_DECLS |
| 73 | |
| 74 | #endif /* !_LOCORE */ |
| 75 | #endif /* _XOPEN_SOURCE || _NETBSD_SOURCE */ |
| 76 | |
| 77 | |
| 78 | #include <machine/endian_machdep.h> |
| 79 | |
| 80 | /* |
| 81 | * Define the order of 32-bit words in 64-bit words. |
| 82 | */ |
| 83 | #if _BYTE_ORDER == _LITTLE_ENDIAN |
| 84 | #define _QUAD_HIGHWORD 1 |
| 85 | #define _QUAD_LOWWORD 0 |
| 86 | #endif |
| 87 | |
| 88 | #if _BYTE_ORDER == _BIG_ENDIAN |
| 89 | #define _QUAD_HIGHWORD 0 |
| 90 | #define _QUAD_LOWWORD 1 |
| 91 | #endif |
| 92 | |
| 93 | |
| 94 | #if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE) |
| 95 | /* |
| 96 | * Traditional names for byteorder. These are defined as the numeric |
| 97 | * sequences so that third party code can "#define XXX_ENDIAN" and not |
| 98 | * cause errors. |
| 99 | */ |
| 100 | #define LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ |
| 101 | #define BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ |
| 102 | #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ |
| 103 | #define BYTE_ORDER _BYTE_ORDER |
| 104 | |
| 105 | #ifndef _LOCORE |
| 106 | |
| 107 | #include <machine/bswap.h> |
| 108 | |
| 109 | /* |
| 110 | * Macros for network/external number representation conversion. |
| 111 | */ |
| 112 | #if BYTE_ORDER == BIG_ENDIAN && !defined(__lint__) |
| 113 | #define ntohl(x) (x) |
| 114 | #define ntohs(x) (x) |
| 115 | #define htonl(x) (x) |
| 116 | #define htons(x) (x) |
| 117 | |
| 118 | #define NTOHL(x) (void) (x) |
| 119 | #define NTOHS(x) (void) (x) |
| 120 | #define HTONL(x) (void) (x) |
| 121 | #define HTONS(x) (void) (x) |
| 122 | |
| 123 | #else /* LITTLE_ENDIAN || !defined(__lint__) */ |
| 124 | |
| 125 | #define ntohl(x) bswap32(__CAST(uint32_t, (x))) |
| 126 | #define ntohs(x) bswap16(__CAST(uint16_t, (x))) |
| 127 | #define htonl(x) bswap32(__CAST(uint32_t, (x))) |
| 128 | #define htons(x) bswap16(__CAST(uint16_t, (x))) |
| 129 | |
| 130 | #define NTOHL(x) (x) = ntohl(__CAST(uint32_t, (x))) |
| 131 | #define NTOHS(x) (x) = ntohs(__CAST(uint16_t, (x))) |
| 132 | #define HTONL(x) (x) = htonl(__CAST(uint32_t, (x))) |
| 133 | #define HTONS(x) (x) = htons(__CAST(uint16_t, (x))) |
| 134 | #endif /* LITTLE_ENDIAN || !defined(__lint__) */ |
| 135 | |
| 136 | /* |
| 137 | * Macros to convert to a specific endianness. |
| 138 | */ |
| 139 | |
| 140 | #if BYTE_ORDER == BIG_ENDIAN |
| 141 | |
| 142 | #define htobe16(x) (x) |
| 143 | #define htobe32(x) (x) |
| 144 | #define htobe64(x) (x) |
| 145 | #define htole16(x) bswap16(__CAST(uint16_t, (x))) |
| 146 | #define htole32(x) bswap32(__CAST(uint32_t, (x))) |
| 147 | #define htole64(x) bswap64(__CAST(uint64_t, (x))) |
| 148 | |
| 149 | #define HTOBE16(x) __CAST(void, (x)) |
| 150 | #define HTOBE32(x) __CAST(void, (x)) |
| 151 | #define HTOBE64(x) __CAST(void, (x)) |
| 152 | #define HTOLE16(x) (x) = bswap16(__CAST(uint16_t, (x))) |
| 153 | #define HTOLE32(x) (x) = bswap32(__CAST(uint32_t, (x))) |
| 154 | #define HTOLE64(x) (x) = bswap64(__CAST(uint64_t, (x))) |
| 155 | |
| 156 | #else /* LITTLE_ENDIAN */ |
| 157 | |
| 158 | #define htobe16(x) bswap16(__CAST(uint16_t, (x))) |
| 159 | #define htobe32(x) bswap32(__CAST(uint32_t, (x))) |
| 160 | #define htobe64(x) bswap64(__CAST(uint64_t, (x))) |
| 161 | #define htole16(x) (x) |
| 162 | #define htole32(x) (x) |
| 163 | #define htole64(x) (x) |
| 164 | |
| 165 | #define HTOBE16(x) (x) = bswap16(__CAST(uint16_t, (x))) |
| 166 | #define HTOBE32(x) (x) = bswap32(__CAST(uint32_t, (x))) |
| 167 | #define HTOBE64(x) (x) = bswap64(__CAST(uint64_t, (x))) |
| 168 | #define HTOLE16(x) __CAST(void, (x)) |
| 169 | #define HTOLE32(x) __CAST(void, (x)) |
| 170 | #define HTOLE64(x) __CAST(void, (x)) |
| 171 | |
| 172 | #endif /* LITTLE_ENDIAN */ |
| 173 | |
| 174 | #define be16toh(x) htobe16(x) |
| 175 | #define be32toh(x) htobe32(x) |
| 176 | #define be64toh(x) htobe64(x) |
| 177 | #define le16toh(x) htole16(x) |
| 178 | #define le32toh(x) htole32(x) |
| 179 | #define le64toh(x) htole64(x) |
| 180 | |
| 181 | #define BE16TOH(x) HTOBE16(x) |
| 182 | #define BE32TOH(x) HTOBE32(x) |
| 183 | #define BE64TOH(x) HTOBE64(x) |
| 184 | #define LE16TOH(x) HTOLE16(x) |
| 185 | #define LE32TOH(x) HTOLE32(x) |
| 186 | #define LE64TOH(x) HTOLE64(x) |
| 187 | |
| 188 | /* |
| 189 | * Routines to encode/decode big- and little-endian multi-octet values |
| 190 | * to/from an octet stream. |
| 191 | */ |
| 192 | |
| 193 | #if __GNUC_PREREQ__(2, 95) |
| 194 | |
| 195 | #define __GEN_ENDIAN_ENC(bits, endian) \ |
| 196 | static __inline void __unused \ |
| 197 | endian ## bits ## enc(void *dst, uint ## bits ## _t u) \ |
| 198 | { \ |
| 199 | u = hto ## endian ## bits (u); \ |
| 200 | __builtin_memcpy(dst, &u, sizeof(u)); \ |
| 201 | } |
| 202 | |
| 203 | __GEN_ENDIAN_ENC(16, be) |
| 204 | __GEN_ENDIAN_ENC(32, be) |
| 205 | __GEN_ENDIAN_ENC(64, be) |
| 206 | __GEN_ENDIAN_ENC(16, le) |
| 207 | __GEN_ENDIAN_ENC(32, le) |
| 208 | __GEN_ENDIAN_ENC(64, le) |
| 209 | #undef __GEN_ENDIAN_ENC |
| 210 | |
| 211 | #define __GEN_ENDIAN_DEC(bits, endian) \ |
| 212 | static __inline uint ## bits ## _t __unused \ |
| 213 | endian ## bits ## dec(const void *buf) \ |
| 214 | { \ |
| 215 | uint ## bits ## _t u; \ |
| 216 | __builtin_memcpy(&u, buf, sizeof(u)); \ |
| 217 | return endian ## bits ## toh (u); \ |
| 218 | } |
| 219 | |
| 220 | __GEN_ENDIAN_DEC(16, be) |
| 221 | __GEN_ENDIAN_DEC(32, be) |
| 222 | __GEN_ENDIAN_DEC(64, be) |
| 223 | __GEN_ENDIAN_DEC(16, le) |
| 224 | __GEN_ENDIAN_DEC(32, le) |
| 225 | __GEN_ENDIAN_DEC(64, le) |
| 226 | #undef __GEN_ENDIAN_DEC |
| 227 | |
| 228 | #else /* !(GCC >= 2.95) */ |
| 229 | |
| 230 | static __inline void __unused |
| 231 | be16enc(void *buf, uint16_t u) |
| 232 | { |
| 233 | uint8_t *p = __CAST(uint8_t *, buf); |
| 234 | |
| 235 | p[0] = __CAST(uint8_t, ((__CAST(unsigned, u) >> 8) & 0xff)); |
| 236 | p[1] = __CAST(uint8_t, (u & 0xff)); |
| 237 | } |
| 238 | |
| 239 | static __inline void __unused |
| 240 | le16enc(void *buf, uint16_t u) |
| 241 | { |
| 242 | uint8_t *p = __CAST(uint8_t *, buf); |
| 243 | |
| 244 | p[0] = __CAST(uint8_t, (u & 0xff)); |
| 245 | p[1] = __CAST(uint8_t, ((__CAST(unsigned, u) >> 8) & 0xff)); |
| 246 | } |
| 247 | |
| 248 | static __inline uint16_t __unused |
| 249 | be16dec(const void *buf) |
| 250 | { |
| 251 | const uint8_t *p = __CAST(const uint8_t *, buf); |
| 252 | |
| 253 | return ((__CAST(uint16_t, p[0]) << 8) | p[1]); |
| 254 | } |
| 255 | |
| 256 | static __inline uint16_t __unused |
| 257 | le16dec(const void *buf) |
| 258 | { |
| 259 | const uint8_t *p = __CAST(const uint8_t *, buf); |
| 260 | |
| 261 | return (p[0] | (__CAST(uint16_t, p[1]) << 8)); |
| 262 | } |
| 263 | |
| 264 | static __inline void __unused |
| 265 | be32enc(void *buf, uint32_t u) |
| 266 | { |
| 267 | uint8_t *p = __CAST(uint8_t *, buf); |
| 268 | |
| 269 | p[0] = __CAST(uint8_t, ((u >> 24) & 0xff)); |
| 270 | p[1] = __CAST(uint8_t, ((u >> 16) & 0xff)); |
| 271 | p[2] = __CAST(uint8_t, ((u >> 8) & 0xff)); |
| 272 | p[3] = __CAST(uint8_t, (u & 0xff)); |
| 273 | } |
| 274 | |
| 275 | static __inline void __unused |
| 276 | le32enc(void *buf, uint32_t u) |
| 277 | { |
| 278 | uint8_t *p = __CAST(uint8_t *, buf); |
| 279 | |
| 280 | p[0] = __CAST(uint8_t, (u & 0xff)); |
| 281 | p[1] = __CAST(uint8_t, ((u >> 8) & 0xff)); |
| 282 | p[2] = __CAST(uint8_t, ((u >> 16) & 0xff)); |
| 283 | p[3] = __CAST(uint8_t, ((u >> 24) & 0xff)); |
| 284 | } |
| 285 | |
| 286 | static __inline uint32_t __unused |
| 287 | be32dec(const void *buf) |
| 288 | { |
| 289 | const uint8_t *p = __CAST(const uint8_t *, buf); |
| 290 | |
| 291 | return ((__CAST(uint32_t, be16dec(p)) << 16) | be16dec(p + 2)); |
| 292 | } |
| 293 | |
| 294 | static __inline uint32_t __unused |
| 295 | le32dec(const void *buf) |
| 296 | { |
| 297 | const uint8_t *p = __CAST(const uint8_t *, buf); |
| 298 | |
| 299 | return (le16dec(p) | (__CAST(uint32_t, le16dec(p + 2)) << 16)); |
| 300 | } |
| 301 | |
| 302 | static __inline void __unused |
| 303 | be64enc(void *buf, uint64_t u) |
| 304 | { |
| 305 | uint8_t *p = __CAST(uint8_t *, buf); |
| 306 | |
| 307 | be32enc(p, __CAST(uint32_t, (u >> 32))); |
| 308 | be32enc(p + 4, __CAST(uint32_t, (u & 0xffffffffULL))); |
| 309 | } |
| 310 | |
| 311 | static __inline void __unused |
| 312 | le64enc(void *buf, uint64_t u) |
| 313 | { |
| 314 | uint8_t *p = __CAST(uint8_t *, buf); |
| 315 | |
| 316 | le32enc(p, __CAST(uint32_t, (u & 0xffffffffULL))); |
| 317 | le32enc(p + 4, __CAST(uint32_t, (u >> 32))); |
| 318 | } |
| 319 | |
| 320 | static __inline uint64_t __unused |
| 321 | be64dec(const void *buf) |
| 322 | { |
| 323 | const uint8_t *p = (const uint8_t *)buf; |
| 324 | |
| 325 | return ((__CAST(uint64_t, be32dec(p)) << 32) | be32dec(p + 4)); |
| 326 | } |
| 327 | |
| 328 | static __inline uint64_t __unused |
| 329 | le64dec(const void *buf) |
| 330 | { |
| 331 | const uint8_t *p = (const uint8_t *)buf; |
| 332 | |
| 333 | return (le32dec(p) | (__CAST(uint64_t, le32dec(p + 4)) << 32)); |
| 334 | } |
| 335 | |
| 336 | #endif /* GCC >= 2.95 */ |
| 337 | |
| 338 | #endif /* !_LOCORE */ |
| 339 | #endif /* _XOPEN_SOURCE || _NETBSD_SOURCE */ |
| 340 | #endif /* !_SYS_ENDIAN_H_ */ |
| 341 | |