1 /* $NetBSD: cd9660_conversion.c,v 1.4 2007/03/14 14:11:17 christos Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause 5 * 6 * Copyright (c) 2005 Daniel Watt, Walter Deignan, Ryan Gabrys, Alan 7 * Perez-Rathke and Ram Vedam. All rights reserved. 8 * 9 * This code was written by Daniel Watt, Walter Deignan, Ryan Gabrys, 10 * Alan Perez-Rathke and Ram Vedam. 11 * 12 * Redistribution and use in source and binary forms, with or 13 * without modification, are permitted provided that the following 14 * conditions are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer in the documentation and/or other materials provided 20 * with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY DANIEL WATT, WALTER DEIGNAN, RYAN 23 * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 26 * DISCLAIMED. IN NO EVENT SHALL DANIEL WATT, WALTER DEIGNAN, RYAN 27 * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 30 * USE,DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 31 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 34 * OF SUCH DAMAGE. 35 */ 36 #include "cd9660.h" 37 38 #include <sys/cdefs.h> 39 static char cd9660_compute_gm_offset(time_t); 40 41 #if 0 42 static inline int 43 cd9660_pad_even(length) 44 int length; 45 { 46 return length + (length & 0x01); 47 } 48 #endif 49 50 /* 51 * These can probably be implemented using a macro 52 */ 53 54 /* Little endian */ 55 void 56 cd9660_721(uint16_t w, unsigned char *twochar) 57 { 58 #if BYTE_ORDER == BIG_ENDIAN 59 w = bswap16(w); 60 #endif 61 memcpy(twochar,&w,2); 62 } 63 64 void 65 cd9660_731(uint32_t w, unsigned char *fourchar) 66 { 67 #if BYTE_ORDER == BIG_ENDIAN 68 w = bswap32(w); 69 #endif 70 memcpy(fourchar,&w,4); 71 } 72 73 /* Big endian */ 74 void 75 cd9660_722(uint16_t w, unsigned char *twochar) 76 { 77 #if BYTE_ORDER == LITTLE_ENDIAN 78 w = bswap16(w); 79 #endif 80 memcpy(twochar,&w,2); 81 } 82 83 void 84 cd9660_732(uint32_t w, unsigned char *fourchar) 85 { 86 #if BYTE_ORDER == LITTLE_ENDIAN 87 w = bswap32(w); 88 #endif 89 memcpy(fourchar,&w,4); 90 } 91 92 /** 93 * Convert a dword into a double endian string of eight characters 94 * @param int The double word to convert 95 * @param char* The string to write the both endian double word to - It is assumed this is allocated and at least 96 * eight characters long 97 */ 98 void 99 cd9660_bothendian_dword(uint32_t dw, unsigned char *eightchar) 100 { 101 uint32_t le, be; 102 #if BYTE_ORDER == LITTLE_ENDIAN 103 le = dw; 104 be = bswap32(dw); 105 #endif 106 #if BYTE_ORDER == BIG_ENDIAN 107 be = dw; 108 le = bswap32(dw); 109 #endif 110 memcpy(eightchar, &le, 4); 111 memcpy((eightchar+4), &be, 4); 112 } 113 114 /** 115 * Convert a word into a double endian string of four characters 116 * @param int The word to convert 117 * @param char* The string to write the both endian word to - It is assumed this is allocated and at least 118 * four characters long 119 */ 120 void 121 cd9660_bothendian_word(uint16_t dw, unsigned char *fourchar) 122 { 123 uint16_t le, be; 124 #if BYTE_ORDER == LITTLE_ENDIAN 125 le = dw; 126 be = bswap16(dw); 127 #endif 128 #if BYTE_ORDER == BIG_ENDIAN 129 be = dw; 130 le = bswap16(dw); 131 #endif 132 memcpy(fourchar, &le, 2); 133 memcpy((fourchar+2), &be, 2); 134 } 135 136 void 137 cd9660_pad_string_spaces(char *str, int len) 138 { 139 int i; 140 141 for (i = 0; i < len; i ++) { 142 if (str[i] == '\0') 143 str[i] = 0x20; 144 } 145 } 146 147 static char 148 cd9660_compute_gm_offset(time_t tim) 149 { 150 struct tm t, gm; 151 152 (void)localtime_r(&tim, &t); 153 (void)gmtime_r(&tim, &gm); 154 gm.tm_year -= t.tm_year; 155 gm.tm_yday -= t.tm_yday; 156 gm.tm_hour -= t.tm_hour; 157 gm.tm_min -= t.tm_min; 158 if (gm.tm_year < 0) 159 gm.tm_yday = -1; 160 else if (gm.tm_year > 0) 161 gm.tm_yday = 1; 162 163 return (char)(-(gm.tm_min + 60* (24 * gm.tm_yday + gm.tm_hour)) / 15); 164 } 165 166 /* Long dates: 17 characters */ 167 void 168 cd9660_time_8426(unsigned char *buf, time_t tim) 169 { 170 struct tm t; 171 char temp[18]; 172 173 (void)localtime_r(&tim, &t); 174 (void)snprintf(temp, sizeof(temp), "%04i%02i%02i%02i%02i%02i%02i", 175 1900+(int)t.tm_year, 176 (int)t.tm_mon+1, 177 (int)t.tm_mday, 178 (int)t.tm_hour, 179 (int)t.tm_min, 180 (int)t.tm_sec, 181 0); 182 (void)memcpy(buf, temp, 16); 183 buf[16] = cd9660_compute_gm_offset(tim); 184 } 185 186 /* Short dates: 7 characters */ 187 void 188 cd9660_time_915(unsigned char *buf, time_t tim) 189 { 190 struct tm t; 191 192 (void)localtime_r(&tim, &t); 193 buf[0] = t.tm_year; 194 buf[1] = t.tm_mon+1; 195 buf[2] = t.tm_mday; 196 buf[3] = t.tm_hour; 197 buf[4] = t.tm_min; 198 buf[5] = t.tm_sec; 199 buf[6] = cd9660_compute_gm_offset(tim); 200 } 201