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 1.4 2004/08/24 06:10:57 joerg Exp $ 30 */ 31 32 #ifndef _SYS_ENDIAN_H_ 33 #define _SYS_ENDIAN_H_ 34 35 #include <sys/types.h> 36 37 /* 38 * General byte order swapping functions. 39 */ 40 #define bswap16(x) __bswap16(x) 41 #define bswap32(x) __bswap32(x) 42 #define bswap64(x) __bswap64(x) 43 44 /* 45 * Host to big endian, host to little endian, big endian to host, and little 46 * endian to host byte order functions as detailed in byteorder(9). 47 */ 48 #if _BYTE_ORDER == _LITTLE_ENDIAN 49 #define htobe16(x) bswap16((x)) 50 #define htobe32(x) bswap32((x)) 51 #define htobe64(x) bswap64((x)) 52 #define htole16(x) ((uint16_t)(x)) 53 #define htole32(x) ((uint32_t)(x)) 54 #define htole64(x) ((uint64_t)(x)) 55 56 #define be16toh(x) bswap16((x)) 57 #define be32toh(x) bswap32((x)) 58 #define be64toh(x) bswap64((x)) 59 #define le16toh(x) ((uint16_t)(x)) 60 #define le32toh(x) ((uint32_t)(x)) 61 #define le64toh(x) ((uint64_t)(x)) 62 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */ 63 #define htobe16(x) ((uint16_t)(x)) 64 #define htobe32(x) ((uint32_t)(x)) 65 #define htobe64(x) ((uint64_t)(x)) 66 #define htole16(x) bswap16((x)) 67 #define htole32(x) bswap32((x)) 68 #define htole64(x) bswap64((x)) 69 70 #define be16toh(x) ((uint16_t)(x)) 71 #define be32toh(x) ((uint32_t)(x)) 72 #define be64toh(x) ((uint64_t)(x)) 73 #define le16toh(x) bswap16((x)) 74 #define le32toh(x) bswap32((x)) 75 #define le64toh(x) bswap64((x)) 76 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */ 77 78 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ 79 80 static __inline uint16_t 81 be16dec(const void *pp) 82 { 83 const uint8_t *p = (const uint8_t *)pp; 84 85 return ((p[0] << 8) | p[1]); 86 } 87 88 static __inline uint32_t 89 be32dec(const void *pp) 90 { 91 const uint8_t *p = (const uint8_t *)pp; 92 93 return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); 94 } 95 96 static __inline uint64_t 97 be64dec(const void *pp) 98 { 99 const uint8_t *p = (const uint8_t *)pp; 100 101 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4)); 102 } 103 104 static __inline uint16_t 105 le16dec(const void *pp) 106 { 107 const uint8_t *p = (const uint8_t *)pp; 108 109 return ((p[1] << 8) | p[0]); 110 } 111 112 static __inline uint32_t 113 le32dec(const void *pp) 114 { 115 const uint8_t *p = (const uint8_t *)pp; 116 117 return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]); 118 } 119 120 static __inline uint64_t 121 le64dec(const void *pp) 122 { 123 const uint8_t *p = (const uint8_t *)pp; 124 125 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p)); 126 } 127 128 static __inline void 129 be16enc(void *pp, uint16_t u) 130 { 131 uint8_t *p = (uint8_t *)pp; 132 133 p[0] = (u >> 8) & 0xff; 134 p[1] = u & 0xff; 135 } 136 137 static __inline void 138 be32enc(void *pp, uint32_t u) 139 { 140 uint8_t *p = (uint8_t *)pp; 141 142 p[0] = (u >> 24) & 0xff; 143 p[1] = (u >> 16) & 0xff; 144 p[2] = (u >> 8) & 0xff; 145 p[3] = u & 0xff; 146 } 147 148 static __inline void 149 be64enc(void *pp, uint64_t u) 150 { 151 uint8_t *p = (uint8_t *)pp; 152 153 be32enc(p, u >> 32); 154 be32enc(p + 4, u & 0xffffffff); 155 } 156 157 static __inline void 158 le16enc(void *pp, uint16_t u) 159 { 160 uint8_t *p = (uint8_t *)pp; 161 162 p[0] = u & 0xff; 163 p[1] = (u >> 8) & 0xff; 164 } 165 166 static __inline void 167 le32enc(void *pp, uint32_t u) 168 { 169 uint8_t *p = (uint8_t *)pp; 170 171 p[0] = u & 0xff; 172 p[1] = (u >> 8) & 0xff; 173 p[2] = (u >> 16) & 0xff; 174 p[3] = (u >> 24) & 0xff; 175 } 176 177 static __inline void 178 le64enc(void *pp, uint64_t u) 179 { 180 uint8_t *p = (uint8_t *)pp; 181 182 le32enc(p, u & 0xffffffff); 183 le32enc(p + 4, u >> 32); 184 } 185 186 #endif /* _SYS_ENDIAN_H_ */ 187