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_ENC_H_ 31 #define _COMPAT_ENDIAN_ENC_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 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ 42 43 static __inline uint16_t 44 be16dec(const void *pp) 45 { 46 unsigned char const *p = (unsigned char const *)pp; 47 48 return ((p[0] << 8) | p[1]); 49 } 50 51 static __inline uint32_t 52 be32dec(const void *pp) 53 { 54 unsigned char const *p = (unsigned char const *)pp; 55 56 return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); 57 } 58 59 static __inline uint64_t 60 be64dec(const void *pp) 61 { 62 unsigned char const *p = (unsigned char const *)pp; 63 64 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4)); 65 } 66 67 static __inline uint16_t 68 le16dec(const void *pp) 69 { 70 unsigned char const *p = (unsigned char const *)pp; 71 72 return ((p[1] << 8) | p[0]); 73 } 74 75 static __inline uint32_t 76 le32dec(const void *pp) 77 { 78 unsigned char const *p = (unsigned char const *)pp; 79 80 return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]); 81 } 82 83 static __inline uint64_t 84 le64dec(const void *pp) 85 { 86 unsigned char const *p = (unsigned char const *)pp; 87 88 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p)); 89 } 90 91 static __inline void 92 be16enc(void *pp, uint16_t u) 93 { 94 unsigned char *p = (unsigned char *)pp; 95 96 p[0] = (u >> 8) & 0xff; 97 p[1] = u & 0xff; 98 } 99 100 static __inline void 101 be32enc(void *pp, uint32_t u) 102 { 103 unsigned char *p = (unsigned char *)pp; 104 105 p[0] = (u >> 24) & 0xff; 106 p[1] = (u >> 16) & 0xff; 107 p[2] = (u >> 8) & 0xff; 108 p[3] = u & 0xff; 109 } 110 111 static __inline void 112 be64enc(void *pp, uint64_t u) 113 { 114 unsigned char *p = (unsigned char *)pp; 115 116 be32enc(p, u >> 32); 117 be32enc(p + 4, u & 0xffffffff); 118 } 119 120 static __inline void 121 le16enc(void *pp, uint16_t u) 122 { 123 unsigned char *p = (unsigned char *)pp; 124 125 p[0] = u & 0xff; 126 p[1] = (u >> 8) & 0xff; 127 } 128 129 static __inline void 130 le32enc(void *pp, uint32_t u) 131 { 132 unsigned char *p = (unsigned char *)pp; 133 134 p[0] = u & 0xff; 135 p[1] = (u >> 8) & 0xff; 136 p[2] = (u >> 16) & 0xff; 137 p[3] = (u >> 24) & 0xff; 138 } 139 140 static __inline void 141 le64enc(void *pp, uint64_t u) 142 { 143 unsigned char *p = (unsigned char *)pp; 144 145 le32enc(p, u & 0xffffffff); 146 le32enc(p + 4, u >> 32); 147 } 148 149 #endif /* _COMPAT_ENDIAN_ENC_H_ */ 150