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 * Borrowed from FreeBSD's <sys/endian.h> 27 */ 28 29 #ifndef ARCHIVE_ENDIAN_H_INCLUDED 30 #define ARCHIVE_ENDIAN_H_INCLUDED 31 32 /* Note: This is a purely internal header! */ 33 /* Do not use this outside of libarchive internal code! */ 34 35 #ifndef __LIBARCHIVE_BUILD 36 #error This header is only to be used internally to libarchive. 37 #endif 38 39 /* 40 * Disabling inline keyword for compilers known to choke on it: 41 * - Watcom C++ in C code. (For any version?) 42 * - SGI MIPSpro 43 * - Microsoft Visual C++ 6.0 (supposedly newer versions too) 44 * - IBM VisualAge 6 (XL v6) 45 * - Sun WorkShop C (SunPro) before 5.9 46 */ 47 #if defined(__WATCOMC__) || defined(__sgi) || defined(__hpux) || defined(__BORLANDC__) 48 #define inline 49 #elif defined(__IBMC__) && __IBMC__ < 700 50 #define inline 51 #elif defined(__SUNPRO_C) && __SUNPRO_C < 0x590 52 #define inline 53 #elif defined(_MSC_VER) || defined(__osf__) 54 #define inline __inline 55 #endif 56 57 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ 58 59 static inline uint16_t 60 archive_be16dec(const void *pp) 61 { 62 unsigned char const *p = (unsigned char const *)pp; 63 64 /* Store into unsigned temporaries before left shifting, to avoid 65 promotion to signed int and then left shifting into the sign bit, 66 which is undefined behaviour. */ 67 unsigned int p1 = p[1]; 68 unsigned int p0 = p[0]; 69 70 return ((p0 << 8) | p1); 71 } 72 73 static inline uint32_t 74 archive_be32dec(const void *pp) 75 { 76 unsigned char const *p = (unsigned char const *)pp; 77 78 /* Store into unsigned temporaries before left shifting, to avoid 79 promotion to signed int and then left shifting into the sign bit, 80 which is undefined behaviour. */ 81 unsigned int p3 = p[3]; 82 unsigned int p2 = p[2]; 83 unsigned int p1 = p[1]; 84 unsigned int p0 = p[0]; 85 86 return ((p0 << 24) | (p1 << 16) | (p2 << 8) | p3); 87 } 88 89 static inline uint64_t 90 archive_be64dec(const void *pp) 91 { 92 unsigned char const *p = (unsigned char const *)pp; 93 94 return (((uint64_t)archive_be32dec(p) << 32) | archive_be32dec(p + 4)); 95 } 96 97 static inline uint16_t 98 archive_le16dec(const void *pp) 99 { 100 unsigned char const *p = (unsigned char const *)pp; 101 102 /* Store into unsigned temporaries before left shifting, to avoid 103 promotion to signed int and then left shifting into the sign bit, 104 which is undefined behaviour. */ 105 unsigned int p1 = p[1]; 106 unsigned int p0 = p[0]; 107 108 return ((p1 << 8) | p0); 109 } 110 111 static inline uint32_t 112 archive_le32dec(const void *pp) 113 { 114 unsigned char const *p = (unsigned char const *)pp; 115 116 /* Store into unsigned temporaries before left shifting, to avoid 117 promotion to signed int and then left shifting into the sign bit, 118 which is undefined behaviour. */ 119 unsigned int p3 = p[3]; 120 unsigned int p2 = p[2]; 121 unsigned int p1 = p[1]; 122 unsigned int p0 = p[0]; 123 124 return ((p3 << 24) | (p2 << 16) | (p1 << 8) | p0); 125 } 126 127 static inline uint64_t 128 archive_le64dec(const void *pp) 129 { 130 unsigned char const *p = (unsigned char const *)pp; 131 132 return (((uint64_t)archive_le32dec(p + 4) << 32) | archive_le32dec(p)); 133 } 134 135 static inline void 136 archive_be16enc(void *pp, uint16_t u) 137 { 138 unsigned char *p = (unsigned char *)pp; 139 140 p[0] = (u >> 8) & 0xff; 141 p[1] = u & 0xff; 142 } 143 144 static inline void 145 archive_be32enc(void *pp, uint32_t u) 146 { 147 unsigned char *p = (unsigned char *)pp; 148 149 p[0] = (u >> 24) & 0xff; 150 p[1] = (u >> 16) & 0xff; 151 p[2] = (u >> 8) & 0xff; 152 p[3] = u & 0xff; 153 } 154 155 static inline void 156 archive_be64enc(void *pp, uint64_t u) 157 { 158 unsigned char *p = (unsigned char *)pp; 159 160 archive_be32enc(p, (uint32_t)(u >> 32)); 161 archive_be32enc(p + 4, (uint32_t)(u & 0xffffffff)); 162 } 163 164 static inline void 165 archive_le16enc(void *pp, uint16_t u) 166 { 167 unsigned char *p = (unsigned char *)pp; 168 169 p[0] = u & 0xff; 170 p[1] = (u >> 8) & 0xff; 171 } 172 173 static inline void 174 archive_le32enc(void *pp, uint32_t u) 175 { 176 unsigned char *p = (unsigned char *)pp; 177 178 p[0] = u & 0xff; 179 p[1] = (u >> 8) & 0xff; 180 p[2] = (u >> 16) & 0xff; 181 p[3] = (u >> 24) & 0xff; 182 } 183 184 static inline void 185 archive_le64enc(void *pp, uint64_t u) 186 { 187 unsigned char *p = (unsigned char *)pp; 188 189 archive_le32enc(p, (uint32_t)(u & 0xffffffff)); 190 archive_le32enc(p + 4, (uint32_t)(u >> 32)); 191 } 192 193 #endif 194