1 /*- 2 * Copyright (c) 2004 The DragonFly Project. All rights reserved. 3 * 4 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org> 5 * 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: src/sys/sys/endian.h,v 1.2.2.1 2002/09/09 05:45:04 imp Exp $ 29 */ 30 31 #ifndef _SYS_ENDIAN_H_ 32 #define _SYS_ENDIAN_H_ 33 34 #include <sys/types.h> 35 #include <machine/endian.h> 36 37 /* 38 * Define the order of 32-bit words in 64-bit words. 39 */ 40 #if _BYTE_ORDER == _LITTLE_ENDIAN 41 #define _QUAD_HIGHWORD 1 42 #define _QUAD_LOWWORD 0 43 #endif 44 45 #if _BYTE_ORDER == _BIG_ENDIAN 46 #define _QUAD_HIGHWORD 0 47 #define _QUAD_LOWWORD 1 48 #endif 49 50 /* 51 * General byte order swapping functions. 52 */ 53 #define bswap16(x) __bswap16(x) 54 #define bswap32(x) __bswap32(x) 55 #define bswap64(x) __bswap64(x) 56 57 /* 58 * Host to big endian, host to little endian, big endian to host, and little 59 * endian to host byte order functions as detailed in byteorder(9). 60 */ 61 #if _BYTE_ORDER == _LITTLE_ENDIAN 62 #define htobe16(x) __bswap16((x)) 63 #define htobe32(x) __bswap32((x)) 64 #define htobe64(x) __bswap64((x)) 65 #define htole16(x) ((__uint16_t)(x)) 66 #define htole32(x) ((__uint32_t)(x)) 67 #define htole64(x) ((__uint64_t)(x)) 68 69 #define be16toh(x) __bswap16((x)) 70 #define be32toh(x) __bswap32((x)) 71 #define be64toh(x) __bswap64((x)) 72 #define le16toh(x) ((__uint16_t)(x)) 73 #define le32toh(x) ((__uint32_t)(x)) 74 #define le64toh(x) ((__uint64_t)(x)) 75 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */ 76 #define htobe16(x) ((__uint16_t)(x)) 77 #define htobe32(x) ((__uint32_t)(x)) 78 #define htobe64(x) ((__uint64_t)(x)) 79 #define htole16(x) __bswap16((x)) 80 #define htole32(x) __bswap32((x)) 81 #define htole64(x) __bswap64((x)) 82 83 #define be16toh(x) ((__uint16_t)(x)) 84 #define be32toh(x) ((__uint32_t)(x)) 85 #define be64toh(x) ((__uint64_t)(x)) 86 #define le16toh(x) __bswap16((x)) 87 #define le32toh(x) __bswap32((x)) 88 #define le64toh(x) __bswap64((x)) 89 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */ 90 91 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ 92 93 static __inline __uint16_t 94 be16dec(const void *pp) 95 { 96 const __uint8_t *p = (const __uint8_t *)pp; 97 98 return ((p[0] << 8) | p[1]); 99 } 100 101 static __inline __uint32_t 102 be32dec(const void *pp) 103 { 104 const __uint8_t *p = (const __uint8_t *)pp; 105 106 return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); 107 } 108 109 static __inline __uint64_t 110 be64dec(const void *pp) 111 { 112 const __uint8_t *p = (const __uint8_t *)pp; 113 114 return (((__uint64_t)be32dec(p) << 32) | be32dec(p + 4)); 115 } 116 117 static __inline __uint16_t 118 le16dec(const void *pp) 119 { 120 const __uint8_t *p = (const __uint8_t *)pp; 121 122 return ((p[1] << 8) | p[0]); 123 } 124 125 static __inline __uint32_t 126 le32dec(const void *pp) 127 { 128 const __uint8_t *p = (const __uint8_t *)pp; 129 130 return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]); 131 } 132 133 static __inline __uint64_t 134 le64dec(const void *pp) 135 { 136 const __uint8_t *p = (const __uint8_t *)pp; 137 138 return (((__uint64_t)le32dec(p + 4) << 32) | le32dec(p)); 139 } 140 141 static __inline void 142 be16enc(void *pp, __uint16_t u) 143 { 144 __uint8_t *p = (__uint8_t *)pp; 145 146 p[0] = (u >> 8) & 0xff; 147 p[1] = u & 0xff; 148 } 149 150 static __inline void 151 be32enc(void *pp, __uint32_t u) 152 { 153 __uint8_t *p = (__uint8_t *)pp; 154 155 p[0] = (u >> 24) & 0xff; 156 p[1] = (u >> 16) & 0xff; 157 p[2] = (u >> 8) & 0xff; 158 p[3] = u & 0xff; 159 } 160 161 static __inline void 162 be64enc(void *pp, __uint64_t u) 163 { 164 __uint8_t *p = (__uint8_t *)pp; 165 166 be32enc(p, u >> 32); 167 be32enc(p + 4, u & 0xffffffff); 168 } 169 170 static __inline void 171 le16enc(void *pp, __uint16_t u) 172 { 173 __uint8_t *p = (__uint8_t *)pp; 174 175 p[0] = u & 0xff; 176 p[1] = (u >> 8) & 0xff; 177 } 178 179 static __inline void 180 le32enc(void *pp, __uint32_t u) 181 { 182 __uint8_t *p = (__uint8_t *)pp; 183 184 p[0] = u & 0xff; 185 p[1] = (u >> 8) & 0xff; 186 p[2] = (u >> 16) & 0xff; 187 p[3] = (u >> 24) & 0xff; 188 } 189 190 static __inline void 191 le64enc(void *pp, __uint64_t u) 192 { 193 __uint8_t *p = (__uint8_t *)pp; 194 195 le32enc(p, u & 0xffffffff); 196 le32enc(p + 4, u >> 32); 197 } 198 199 #endif /* _SYS_ENDIAN_H_ */ 200