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: head/lib/libarchive/archive_endian.h 201085 2009-12-28 02:17:15Z kientzle $ 27 * 28 * Borrowed from FreeBSD's <sys/endian.h> 29 */ 30 31 #ifndef __LIBARCHIVE_BUILD 32 #error This header is only to be used internally to libarchive. 33 #endif 34 35 /* Note: This is a purely internal header! */ 36 /* Do not use this outside of libarchive internal code! */ 37 38 #ifndef ARCHIVE_ENDIAN_H_INCLUDED 39 #define ARCHIVE_ENDIAN_H_INCLUDED 40 41 42 /* 43 * Disabling inline keyword for compilers known to choke on it: 44 * - Watcom C++ in C code. (For any version?) 45 * - SGI MIPSpro 46 * - Microsoft Visual C++ 6.0 (supposedly newer versions too) 47 * - IBM VisualAge 6 (XL v6) 48 * - Sun WorkShop C (SunPro) before 5.9 49 */ 50 #if defined(__WATCOMC__) || defined(__sgi) || defined(__hpux) || defined(__BORLANDC__) 51 #define inline 52 #elif defined(__IBMC__) && __IBMC__ < 700 53 #define inline 54 #elif defined(__SUNPRO_C) && __SUNPRO_C < 0x590 55 #define inline 56 #elif defined(_MSC_VER) || defined(__osf__) 57 #define inline __inline 58 #endif 59 60 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ 61 62 static inline uint16_t 63 archive_be16dec(const void *pp) 64 { 65 unsigned char const *p = (unsigned char const *)pp; 66 67 /* Store into unsigned temporaries before left shifting, to avoid 68 promotion to signed int and then left shifting into the sign bit, 69 which is undefined behaviour. */ 70 unsigned int p1 = p[1]; 71 unsigned int p0 = p[0]; 72 73 return ((p0 << 8) | p1); 74 } 75 76 static inline uint32_t 77 archive_be32dec(const void *pp) 78 { 79 unsigned char const *p = (unsigned char const *)pp; 80 81 /* Store into unsigned temporaries before left shifting, to avoid 82 promotion to signed int and then left shifting into the sign bit, 83 which is undefined behaviour. */ 84 unsigned int p3 = p[3]; 85 unsigned int p2 = p[2]; 86 unsigned int p1 = p[1]; 87 unsigned int p0 = p[0]; 88 89 return ((p0 << 24) | (p1 << 16) | (p2 << 8) | p3); 90 } 91 92 static inline uint64_t 93 archive_be64dec(const void *pp) 94 { 95 unsigned char const *p = (unsigned char const *)pp; 96 97 return (((uint64_t)archive_be32dec(p) << 32) | archive_be32dec(p + 4)); 98 } 99 100 static inline uint16_t 101 archive_le16dec(const void *pp) 102 { 103 unsigned char const *p = (unsigned char const *)pp; 104 105 /* Store into unsigned temporaries before left shifting, to avoid 106 promotion to signed int and then left shifting into the sign bit, 107 which is undefined behaviour. */ 108 unsigned int p1 = p[1]; 109 unsigned int p0 = p[0]; 110 111 return ((p1 << 8) | p0); 112 } 113 114 static inline uint32_t 115 archive_le32dec(const void *pp) 116 { 117 unsigned char const *p = (unsigned char const *)pp; 118 119 /* Store into unsigned temporaries before left shifting, to avoid 120 promotion to signed int and then left shifting into the sign bit, 121 which is undefined behaviour. */ 122 unsigned int p3 = p[3]; 123 unsigned int p2 = p[2]; 124 unsigned int p1 = p[1]; 125 unsigned int p0 = p[0]; 126 127 return ((p3 << 24) | (p2 << 16) | (p1 << 8) | p0); 128 } 129 130 static inline uint64_t 131 archive_le64dec(const void *pp) 132 { 133 unsigned char const *p = (unsigned char const *)pp; 134 135 return (((uint64_t)archive_le32dec(p + 4) << 32) | archive_le32dec(p)); 136 } 137 138 static inline void 139 archive_be16enc(void *pp, uint16_t u) 140 { 141 unsigned char *p = (unsigned char *)pp; 142 143 p[0] = (u >> 8) & 0xff; 144 p[1] = u & 0xff; 145 } 146 147 static inline void 148 archive_be32enc(void *pp, uint32_t u) 149 { 150 unsigned char *p = (unsigned char *)pp; 151 152 p[0] = (u >> 24) & 0xff; 153 p[1] = (u >> 16) & 0xff; 154 p[2] = (u >> 8) & 0xff; 155 p[3] = u & 0xff; 156 } 157 158 static inline void 159 archive_be64enc(void *pp, uint64_t u) 160 { 161 unsigned char *p = (unsigned char *)pp; 162 163 archive_be32enc(p, (uint32_t)(u >> 32)); 164 archive_be32enc(p + 4, (uint32_t)(u & 0xffffffff)); 165 } 166 167 static inline void 168 archive_le16enc(void *pp, uint16_t u) 169 { 170 unsigned char *p = (unsigned char *)pp; 171 172 p[0] = u & 0xff; 173 p[1] = (u >> 8) & 0xff; 174 } 175 176 static inline void 177 archive_le32enc(void *pp, uint32_t u) 178 { 179 unsigned char *p = (unsigned char *)pp; 180 181 p[0] = u & 0xff; 182 p[1] = (u >> 8) & 0xff; 183 p[2] = (u >> 16) & 0xff; 184 p[3] = (u >> 24) & 0xff; 185 } 186 187 static inline void 188 archive_le64enc(void *pp, uint64_t u) 189 { 190 unsigned char *p = (unsigned char *)pp; 191 192 archive_le32enc(p, (uint32_t)(u & 0xffffffff)); 193 archive_le32enc(p + 4, (uint32_t)(u >> 32)); 194 } 195 196 #endif 197