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 * $P4: //depot/projects/trustedbsd/openbsm/compat/endian_enc.h#1 $ 29 */ 30 31 #ifndef _COMPAT_ENDIAN_ENC_H_ 32 #define _COMPAT_ENDIAN_ENC_H_ 33 34 /* 35 * Some systems will have the uint/int types defined here already, others 36 * will need stdint.h. 37 */ 38 #ifdef HAVE_STDINT_H 39 #include <stdint.h> 40 #endif 41 42 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ 43 44 static __inline uint16_t 45 be16dec(const void *pp) 46 { 47 unsigned char const *p = (unsigned char const *)pp; 48 49 return ((p[0] << 8) | p[1]); 50 } 51 52 static __inline uint32_t 53 be32dec(const void *pp) 54 { 55 unsigned char const *p = (unsigned char const *)pp; 56 57 return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); 58 } 59 60 static __inline uint64_t 61 be64dec(const void *pp) 62 { 63 unsigned char const *p = (unsigned char const *)pp; 64 65 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4)); 66 } 67 68 static __inline uint16_t 69 le16dec(const void *pp) 70 { 71 unsigned char const *p = (unsigned char const *)pp; 72 73 return ((p[1] << 8) | p[0]); 74 } 75 76 static __inline uint32_t 77 le32dec(const void *pp) 78 { 79 unsigned char const *p = (unsigned char const *)pp; 80 81 return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]); 82 } 83 84 static __inline uint64_t 85 le64dec(const void *pp) 86 { 87 unsigned char const *p = (unsigned char const *)pp; 88 89 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p)); 90 } 91 92 static __inline void 93 be16enc(void *pp, uint16_t u) 94 { 95 unsigned char *p = (unsigned char *)pp; 96 97 p[0] = (u >> 8) & 0xff; 98 p[1] = u & 0xff; 99 } 100 101 static __inline void 102 be32enc(void *pp, uint32_t u) 103 { 104 unsigned char *p = (unsigned char *)pp; 105 106 p[0] = (u >> 24) & 0xff; 107 p[1] = (u >> 16) & 0xff; 108 p[2] = (u >> 8) & 0xff; 109 p[3] = u & 0xff; 110 } 111 112 static __inline void 113 be64enc(void *pp, uint64_t u) 114 { 115 unsigned char *p = (unsigned char *)pp; 116 117 be32enc(p, u >> 32); 118 be32enc(p + 4, u & 0xffffffff); 119 } 120 121 static __inline void 122 le16enc(void *pp, uint16_t u) 123 { 124 unsigned char *p = (unsigned char *)pp; 125 126 p[0] = u & 0xff; 127 p[1] = (u >> 8) & 0xff; 128 } 129 130 static __inline void 131 le32enc(void *pp, uint32_t u) 132 { 133 unsigned char *p = (unsigned char *)pp; 134 135 p[0] = u & 0xff; 136 p[1] = (u >> 8) & 0xff; 137 p[2] = (u >> 16) & 0xff; 138 p[3] = (u >> 24) & 0xff; 139 } 140 141 static __inline void 142 le64enc(void *pp, uint64_t u) 143 { 144 unsigned char *p = (unsigned char *)pp; 145 146 le32enc(p, u & 0xffffffff); 147 le32enc(p + 4, u >> 32); 148 } 149 150 #endif /* _COMPAT_ENDIAN_ENC_H_ */ 151