1 /*- 2 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 * 28 * Borrowed from FreeBSD's <sys/endian.h> 29 */ 30 31 #ifndef ARCHIVE_ENDIAN_H_INCLUDED 32 #define ARCHIVE_ENDIAN_H_INCLUDED 33 34 /* Note: This is a purely internal header! */ 35 /* Do not use this outside of libarchive internal code! */ 36 37 #ifndef __LIBARCHIVE_BUILD 38 #error This header is only to be used internally to libarchive. 39 #endif 40 41 /* 42 * Disabling inline keyword for compilers known to choke on it: 43 * - Watcom C++ in C code. (For any version?) 44 * - SGI MIPSpro 45 * - Microsoft Visual C++ 6.0 (supposedly newer versions too) 46 * - IBM VisualAge 6 (XL v6) 47 * - Sun WorkShop C (SunPro) before 5.9 48 */ 49 #if defined(__WATCOMC__) || defined(__sgi) || defined(__hpux) || defined(__BORLANDC__) 50 #define inline 51 #elif defined(__IBMC__) && __IBMC__ < 700 52 #define inline 53 #elif defined(__SUNPRO_C) && __SUNPRO_C < 0x590 54 #define inline 55 #elif defined(_MSC_VER) || defined(__osf__) 56 #define inline __inline 57 #endif 58 59 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ 60 61 static inline uint16_t 62 archive_be16dec(const void *pp) 63 { 64 unsigned char const *p = (unsigned char const *)pp; 65 66 /* Store into unsigned temporaries before left shifting, to avoid 67 promotion to signed int and then left shifting into the sign bit, 68 which is undefined behaviour. */ 69 unsigned int p1 = p[1]; 70 unsigned int p0 = p[0]; 71 72 return ((p0 << 8) | p1); 73 } 74 75 static inline uint32_t 76 archive_be32dec(const void *pp) 77 { 78 unsigned char const *p = (unsigned char const *)pp; 79 80 /* Store into unsigned temporaries before left shifting, to avoid 81 promotion to signed int and then left shifting into the sign bit, 82 which is undefined behaviour. */ 83 unsigned int p3 = p[3]; 84 unsigned int p2 = p[2]; 85 unsigned int p1 = p[1]; 86 unsigned int p0 = p[0]; 87 88 return ((p0 << 24) | (p1 << 16) | (p2 << 8) | p3); 89 } 90 91 static inline uint64_t 92 archive_be64dec(const void *pp) 93 { 94 unsigned char const *p = (unsigned char const *)pp; 95 96 return (((uint64_t)archive_be32dec(p) << 32) | archive_be32dec(p + 4)); 97 } 98 99 static inline uint16_t 100 archive_le16dec(const void *pp) 101 { 102 unsigned char const *p = (unsigned char const *)pp; 103 104 /* Store into unsigned temporaries before left shifting, to avoid 105 promotion to signed int and then left shifting into the sign bit, 106 which is undefined behaviour. */ 107 unsigned int p1 = p[1]; 108 unsigned int p0 = p[0]; 109 110 return ((p1 << 8) | p0); 111 } 112 113 static inline uint32_t 114 archive_le32dec(const void *pp) 115 { 116 unsigned char const *p = (unsigned char const *)pp; 117 118 /* Store into unsigned temporaries before left shifting, to avoid 119 promotion to signed int and then left shifting into the sign bit, 120 which is undefined behaviour. */ 121 unsigned int p3 = p[3]; 122 unsigned int p2 = p[2]; 123 unsigned int p1 = p[1]; 124 unsigned int p0 = p[0]; 125 126 return ((p3 << 24) | (p2 << 16) | (p1 << 8) | p0); 127 } 128 129 static inline uint64_t 130 archive_le64dec(const void *pp) 131 { 132 unsigned char const *p = (unsigned char const *)pp; 133 134 return (((uint64_t)archive_le32dec(p + 4) << 32) | archive_le32dec(p)); 135 } 136 137 static inline void 138 archive_be16enc(void *pp, uint16_t u) 139 { 140 unsigned char *p = (unsigned char *)pp; 141 142 p[0] = (u >> 8) & 0xff; 143 p[1] = u & 0xff; 144 } 145 146 static inline void 147 archive_be32enc(void *pp, uint32_t u) 148 { 149 unsigned char *p = (unsigned char *)pp; 150 151 p[0] = (u >> 24) & 0xff; 152 p[1] = (u >> 16) & 0xff; 153 p[2] = (u >> 8) & 0xff; 154 p[3] = u & 0xff; 155 } 156 157 static inline void 158 archive_be64enc(void *pp, uint64_t u) 159 { 160 unsigned char *p = (unsigned char *)pp; 161 162 archive_be32enc(p, (uint32_t)(u >> 32)); 163 archive_be32enc(p + 4, (uint32_t)(u & 0xffffffff)); 164 } 165 166 static inline void 167 archive_le16enc(void *pp, uint16_t u) 168 { 169 unsigned char *p = (unsigned char *)pp; 170 171 p[0] = u & 0xff; 172 p[1] = (u >> 8) & 0xff; 173 } 174 175 static inline void 176 archive_le32enc(void *pp, uint32_t u) 177 { 178 unsigned char *p = (unsigned char *)pp; 179 180 p[0] = u & 0xff; 181 p[1] = (u >> 8) & 0xff; 182 p[2] = (u >> 16) & 0xff; 183 p[3] = (u >> 24) & 0xff; 184 } 185 186 static inline void 187 archive_le64enc(void *pp, uint64_t u) 188 { 189 unsigned char *p = (unsigned char *)pp; 190 191 archive_le32enc(p, (uint32_t)(u & 0xffffffff)); 192 archive_le32enc(p + 4, (uint32_t)(u >> 32)); 193 } 194 195 #endif 196