1 /*- 2 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org> 3 * Copyright (c) 2005 Robert N. M. Watson 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * Derived from FreeBSD src/sys/sys/endian.h:1.6. 28 */ 29 30 #ifndef _COMPAT_ENDIAN_H_ 31 #define _COMPAT_ENDIAN_H_ 32 33 /* 34 * Some systems will have the uint/int types defined here already, others 35 * will need stdint.h. 36 */ 37 #ifdef HAVE_STDINT_H 38 #include <stdint.h> 39 #endif 40 41 /* 42 * Some operating systems do not yet have the more recent endian APIs that 43 * permit encoding to and decoding from byte streams. For those systems, we 44 * implement local non-optimized versions. 45 */ 46 47 static __inline uint16_t 48 bswap16(uint16_t int16) 49 { 50 const unsigned char *from; 51 unsigned char *to; 52 uint16_t t; 53 54 from = (const unsigned char *) &int16; 55 to = (unsigned char *) &t; 56 57 to[0] = from[1]; 58 to[1] = from[0]; 59 60 return (t); 61 } 62 63 static __inline uint32_t 64 bswap32(uint32_t int32) 65 { 66 const unsigned char *from; 67 unsigned char *to; 68 uint32_t t; 69 70 from = (const unsigned char *) &int32; 71 to = (unsigned char *) &t; 72 73 to[0] = from[3]; 74 to[1] = from[2]; 75 to[2] = from[1]; 76 to[3] = from[0]; 77 78 return (t); 79 } 80 81 static __inline uint64_t 82 bswap64(uint64_t int64) 83 { 84 const unsigned char *from; 85 unsigned char *to; 86 uint64_t t; 87 88 from = (const unsigned char *) &int64; 89 to = (unsigned char *) &t; 90 91 to[0] = from[7]; 92 to[1] = from[6]; 93 to[2] = from[5]; 94 to[3] = from[4]; 95 to[4] = from[3]; 96 to[5] = from[2]; 97 to[6] = from[1]; 98 to[7] = from[0]; 99 100 return (t); 101 } 102 103 #if defined(BYTE_ORDER) && !defined(_BYTE_ORDER) 104 #define _BYTE_ORDER BYTE_ORDER 105 #endif 106 #if !defined(_BYTE_ORDER) 107 #error "Neither BYTE_ORDER nor _BYTE_ORDER defined" 108 #endif 109 110 #if defined(BIG_ENDIAN) && !defined(_BIG_ENDIAN) 111 #define _BIG_ENDIAN BIG_ENDIAN 112 #endif 113 114 #if defined(LITTLE_ENDIAN) && !defined(_LITTLE_ENDIAN) 115 #define _LITTLE_ENDIAN LITTLE_ENDIAN 116 #endif 117 118 /* XXX: Hack. */ 119 #ifndef htobe16 120 /* 121 * Host to big endian, host to little endian, big endian to host, and little 122 * endian to host byte order functions as detailed in byteorder(9). 123 */ 124 #if _BYTE_ORDER == _LITTLE_ENDIAN 125 #define htobe16(x) bswap16((x)) 126 #define htobe32(x) bswap32((x)) 127 #define htobe64(x) bswap64((x)) 128 #define htole16(x) ((uint16_t)(x)) 129 #define htole32(x) ((uint32_t)(x)) 130 #define htole64(x) ((uint64_t)(x)) 131 132 #define be16toh(x) bswap16((x)) 133 #define be32toh(x) bswap32((x)) 134 #define be64toh(x) bswap64((x)) 135 #define le16toh(x) ((uint16_t)(x)) 136 #define le32toh(x) ((uint32_t)(x)) 137 #define le64toh(x) ((uint64_t)(x)) 138 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */ 139 #define htobe16(x) ((uint16_t)(x)) 140 #define htobe32(x) ((uint32_t)(x)) 141 #define htobe64(x) ((uint64_t)(x)) 142 #define htole16(x) bswap16((x)) 143 #define htole32(x) bswap32((x)) 144 #define htole64(x) bswap64((x)) 145 146 #define be16toh(x) ((uint16_t)(x)) 147 #define be32toh(x) ((uint32_t)(x)) 148 #define be64toh(x) ((uint64_t)(x)) 149 #define le16toh(x) bswap16((x)) 150 #define le32toh(x) bswap32((x)) 151 #define le64toh(x) bswap64((x)) 152 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */ 153 #endif 154 155 #endif /* _COMPAT_ENDIAN_H_ */ 156