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 #ifndef _SYS_TYPES_H_ 35 #include <sys/types.h> 36 #endif 37 #include <machine/endian.h> 38 39 /* 40 * General byte order swapping functions. 41 */ 42 #define bswap16(x) __bswap16(x) 43 #define bswap32(x) __bswap32(x) 44 #define bswap64(x) __bswap64(x) 45 46 /* 47 * Host to big endian, host to little endian, big endian to host, and little 48 * endian to host byte order functions as detailed in byteorder(9). 49 */ 50 #if _BYTE_ORDER == _LITTLE_ENDIAN 51 #define htobe16(x) bswap16((x)) 52 #define htobe32(x) bswap32((x)) 53 #define htobe64(x) bswap64((x)) 54 #define htole16(x) ((__uint16_t)(x)) 55 #define htole32(x) ((__uint32_t)(x)) 56 #define htole64(x) ((__uint64_t)(x)) 57 58 #define be16toh(x) bswap16((x)) 59 #define be32toh(x) bswap32((x)) 60 #define be64toh(x) bswap64((x)) 61 #define le16toh(x) ((__uint16_t)(x)) 62 #define le32toh(x) ((__uint32_t)(x)) 63 #define le64toh(x) ((__uint64_t)(x)) 64 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */ 65 #define htobe16(x) ((__uint16_t)(x)) 66 #define htobe32(x) ((__uint32_t)(x)) 67 #define htobe64(x) ((__uint64_t)(x)) 68 #define htole16(x) bswap16((x)) 69 #define htole32(x) bswap32((x)) 70 #define htole64(x) bswap64((x)) 71 72 #define be16toh(x) ((__uint16_t)(x)) 73 #define be32toh(x) ((__uint32_t)(x)) 74 #define be64toh(x) ((__uint64_t)(x)) 75 #define le16toh(x) bswap16((x)) 76 #define le32toh(x) bswap32((x)) 77 #define le64toh(x) bswap64((x)) 78 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */ 79 80 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ 81 82 static __inline __uint16_t 83 be16dec(const void *pp) 84 { 85 const __uint8_t *p = (const __uint8_t *)pp; 86 87 return ((p[0] << 8) | p[1]); 88 } 89 90 static __inline __uint32_t 91 be32dec(const void *pp) 92 { 93 const __uint8_t *p = (const __uint8_t *)pp; 94 95 return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); 96 } 97 98 static __inline __uint64_t 99 be64dec(const void *pp) 100 { 101 const __uint8_t *p = (const __uint8_t *)pp; 102 103 return (((__uint64_t)be32dec(p) << 32) | be32dec(p + 4)); 104 } 105 106 static __inline __uint16_t 107 le16dec(const void *pp) 108 { 109 const __uint8_t *p = (const __uint8_t *)pp; 110 111 return ((p[1] << 8) | p[0]); 112 } 113 114 static __inline __uint32_t 115 le32dec(const void *pp) 116 { 117 const __uint8_t *p = (const __uint8_t *)pp; 118 119 return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]); 120 } 121 122 static __inline __uint64_t 123 le64dec(const void *pp) 124 { 125 const __uint8_t *p = (const __uint8_t *)pp; 126 127 return (((__uint64_t)le32dec(p + 4) << 32) | le32dec(p)); 128 } 129 130 static __inline void 131 be16enc(void *pp, __uint16_t u) 132 { 133 __uint8_t *p = (__uint8_t *)pp; 134 135 p[0] = (u >> 8) & 0xff; 136 p[1] = u & 0xff; 137 } 138 139 static __inline void 140 be32enc(void *pp, __uint32_t u) 141 { 142 __uint8_t *p = (__uint8_t *)pp; 143 144 p[0] = (u >> 24) & 0xff; 145 p[1] = (u >> 16) & 0xff; 146 p[2] = (u >> 8) & 0xff; 147 p[3] = u & 0xff; 148 } 149 150 static __inline void 151 be64enc(void *pp, __uint64_t u) 152 { 153 __uint8_t *p = (__uint8_t *)pp; 154 155 be32enc(p, u >> 32); 156 be32enc(p + 4, u & 0xffffffff); 157 } 158 159 static __inline void 160 le16enc(void *pp, __uint16_t u) 161 { 162 __uint8_t *p = (__uint8_t *)pp; 163 164 p[0] = u & 0xff; 165 p[1] = (u >> 8) & 0xff; 166 } 167 168 static __inline void 169 le32enc(void *pp, __uint32_t u) 170 { 171 __uint8_t *p = (__uint8_t *)pp; 172 173 p[0] = u & 0xff; 174 p[1] = (u >> 8) & 0xff; 175 p[2] = (u >> 16) & 0xff; 176 p[3] = (u >> 24) & 0xff; 177 } 178 179 static __inline void 180 le64enc(void *pp, __uint64_t u) 181 { 182 __uint8_t *p = (__uint8_t *)pp; 183 184 le32enc(p, u & 0xffffffff); 185 le32enc(p + 4, u >> 32); 186 } 187 188 #endif /* _SYS_ENDIAN_H_ */ 189