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 * $DragonFly: src/sys/sys/endian.h,v 1.5 2006/05/20 02:42:13 dillon Exp $ 30 */ 31 32 #ifndef _SYS_ENDIAN_H_ 33 #define _SYS_ENDIAN_H_ 34 35 #ifndef _SYS_TYPES_H_ 36 #include <sys/types.h> 37 #endif 38 #ifndef _MACHINE_ENDIAN_H_ 39 #include <machine/endian.h> 40 #endif 41 42 /* 43 * General byte order swapping functions. 44 */ 45 #define bswap16(x) __bswap16(x) 46 #define bswap32(x) __bswap32(x) 47 #define bswap64(x) __bswap64(x) 48 49 /* 50 * Host to big endian, host to little endian, big endian to host, and little 51 * endian to host byte order functions as detailed in byteorder(9). 52 */ 53 #if _BYTE_ORDER == _LITTLE_ENDIAN 54 #define htobe16(x) bswap16((x)) 55 #define htobe32(x) bswap32((x)) 56 #define htobe64(x) bswap64((x)) 57 #define htole16(x) ((uint16_t)(x)) 58 #define htole32(x) ((uint32_t)(x)) 59 #define htole64(x) ((uint64_t)(x)) 60 61 #define be16toh(x) bswap16((x)) 62 #define be32toh(x) bswap32((x)) 63 #define be64toh(x) bswap64((x)) 64 #define le16toh(x) ((uint16_t)(x)) 65 #define le32toh(x) ((uint32_t)(x)) 66 #define le64toh(x) ((uint64_t)(x)) 67 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */ 68 #define htobe16(x) ((uint16_t)(x)) 69 #define htobe32(x) ((uint32_t)(x)) 70 #define htobe64(x) ((uint64_t)(x)) 71 #define htole16(x) bswap16((x)) 72 #define htole32(x) bswap32((x)) 73 #define htole64(x) bswap64((x)) 74 75 #define be16toh(x) ((uint16_t)(x)) 76 #define be32toh(x) ((uint32_t)(x)) 77 #define be64toh(x) ((uint64_t)(x)) 78 #define le16toh(x) bswap16((x)) 79 #define le32toh(x) bswap32((x)) 80 #define le64toh(x) bswap64((x)) 81 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */ 82 83 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ 84 85 static __inline uint16_t 86 be16dec(const void *pp) 87 { 88 const uint8_t *p = (const uint8_t *)pp; 89 90 return ((p[0] << 8) | p[1]); 91 } 92 93 static __inline uint32_t 94 be32dec(const void *pp) 95 { 96 const uint8_t *p = (const uint8_t *)pp; 97 98 return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); 99 } 100 101 static __inline uint64_t 102 be64dec(const void *pp) 103 { 104 const uint8_t *p = (const uint8_t *)pp; 105 106 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4)); 107 } 108 109 static __inline uint16_t 110 le16dec(const void *pp) 111 { 112 const uint8_t *p = (const uint8_t *)pp; 113 114 return ((p[1] << 8) | p[0]); 115 } 116 117 static __inline uint32_t 118 le32dec(const void *pp) 119 { 120 const uint8_t *p = (const uint8_t *)pp; 121 122 return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]); 123 } 124 125 static __inline uint64_t 126 le64dec(const void *pp) 127 { 128 const uint8_t *p = (const uint8_t *)pp; 129 130 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p)); 131 } 132 133 static __inline void 134 be16enc(void *pp, uint16_t u) 135 { 136 uint8_t *p = (uint8_t *)pp; 137 138 p[0] = (u >> 8) & 0xff; 139 p[1] = u & 0xff; 140 } 141 142 static __inline void 143 be32enc(void *pp, uint32_t u) 144 { 145 uint8_t *p = (uint8_t *)pp; 146 147 p[0] = (u >> 24) & 0xff; 148 p[1] = (u >> 16) & 0xff; 149 p[2] = (u >> 8) & 0xff; 150 p[3] = u & 0xff; 151 } 152 153 static __inline void 154 be64enc(void *pp, uint64_t u) 155 { 156 uint8_t *p = (uint8_t *)pp; 157 158 be32enc(p, u >> 32); 159 be32enc(p + 4, u & 0xffffffff); 160 } 161 162 static __inline void 163 le16enc(void *pp, uint16_t u) 164 { 165 uint8_t *p = (uint8_t *)pp; 166 167 p[0] = u & 0xff; 168 p[1] = (u >> 8) & 0xff; 169 } 170 171 static __inline void 172 le32enc(void *pp, uint32_t u) 173 { 174 uint8_t *p = (uint8_t *)pp; 175 176 p[0] = u & 0xff; 177 p[1] = (u >> 8) & 0xff; 178 p[2] = (u >> 16) & 0xff; 179 p[3] = (u >> 24) & 0xff; 180 } 181 182 static __inline void 183 le64enc(void *pp, uint64_t u) 184 { 185 uint8_t *p = (uint8_t *)pp; 186 187 le32enc(p, u & 0xffffffff); 188 le32enc(p + 4, u >> 32); 189 } 190 191 #endif /* _SYS_ENDIAN_H_ */ 192