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 __FBSDID("$FreeBSD$"); 40 41 static char cd9660_compute_gm_offset(time_t); 42 43 #if 0 44 static inline int 45 cd9660_pad_even(length) 46 int length; 47 { 48 return length + (length & 0x01); 49 } 50 #endif 51 52 /* 53 * These can probably be implemented using a macro 54 */ 55 56 /* Little endian */ 57 void 58 cd9660_721(uint16_t w, unsigned char *twochar) 59 { 60 #if BYTE_ORDER == BIG_ENDIAN 61 w = bswap16(w); 62 #endif 63 memcpy(twochar,&w,2); 64 } 65 66 void 67 cd9660_731(uint32_t w, unsigned char *fourchar) 68 { 69 #if BYTE_ORDER == BIG_ENDIAN 70 w = bswap32(w); 71 #endif 72 memcpy(fourchar,&w,4); 73 } 74 75 /* Big endian */ 76 void 77 cd9660_722(uint16_t w, unsigned char *twochar) 78 { 79 #if BYTE_ORDER == LITTLE_ENDIAN 80 w = bswap16(w); 81 #endif 82 memcpy(twochar,&w,2); 83 } 84 85 void 86 cd9660_732(uint32_t w, unsigned char *fourchar) 87 { 88 #if BYTE_ORDER == LITTLE_ENDIAN 89 w = bswap32(w); 90 #endif 91 memcpy(fourchar,&w,4); 92 } 93 94 /** 95 * Convert a dword into a double endian string of eight characters 96 * @param int The double word to convert 97 * @param char* The string to write the both endian double word to - It is assumed this is allocated and at least 98 * eight characters long 99 */ 100 void 101 cd9660_bothendian_dword(uint32_t dw, unsigned char *eightchar) 102 { 103 uint32_t le, be; 104 #if BYTE_ORDER == LITTLE_ENDIAN 105 le = dw; 106 be = bswap32(dw); 107 #endif 108 #if BYTE_ORDER == BIG_ENDIAN 109 be = dw; 110 le = bswap32(dw); 111 #endif 112 memcpy(eightchar, &le, 4); 113 memcpy((eightchar+4), &be, 4); 114 } 115 116 /** 117 * Convert a word into a double endian string of four characters 118 * @param int The word to convert 119 * @param char* The string to write the both endian word to - It is assumed this is allocated and at least 120 * four characters long 121 */ 122 void 123 cd9660_bothendian_word(uint16_t dw, unsigned char *fourchar) 124 { 125 uint16_t le, be; 126 #if BYTE_ORDER == LITTLE_ENDIAN 127 le = dw; 128 be = bswap16(dw); 129 #endif 130 #if BYTE_ORDER == BIG_ENDIAN 131 be = dw; 132 le = bswap16(dw); 133 #endif 134 memcpy(fourchar, &le, 2); 135 memcpy((fourchar+2), &be, 2); 136 } 137 138 void 139 cd9660_pad_string_spaces(char *str, int len) 140 { 141 int i; 142 143 for (i = 0; i < len; i ++) { 144 if (str[i] == '\0') 145 str[i] = 0x20; 146 } 147 } 148 149 static char 150 cd9660_compute_gm_offset(time_t tim) 151 { 152 struct tm t, gm; 153 154 (void)localtime_r(&tim, &t); 155 (void)gmtime_r(&tim, &gm); 156 gm.tm_year -= t.tm_year; 157 gm.tm_yday -= t.tm_yday; 158 gm.tm_hour -= t.tm_hour; 159 gm.tm_min -= t.tm_min; 160 if (gm.tm_year < 0) 161 gm.tm_yday = -1; 162 else if (gm.tm_year > 0) 163 gm.tm_yday = 1; 164 165 return (char)(-(gm.tm_min + 60* (24 * gm.tm_yday + gm.tm_hour)) / 15); 166 } 167 168 /* Long dates: 17 characters */ 169 void 170 cd9660_time_8426(unsigned char *buf, time_t tim) 171 { 172 struct tm t; 173 char temp[18]; 174 175 (void)localtime_r(&tim, &t); 176 (void)snprintf(temp, sizeof(temp), "%04i%02i%02i%02i%02i%02i%02i", 177 1900+(int)t.tm_year, 178 (int)t.tm_mon+1, 179 (int)t.tm_mday, 180 (int)t.tm_hour, 181 (int)t.tm_min, 182 (int)t.tm_sec, 183 0); 184 (void)memcpy(buf, temp, 16); 185 buf[16] = cd9660_compute_gm_offset(tim); 186 } 187 188 /* Short dates: 7 characters */ 189 void 190 cd9660_time_915(unsigned char *buf, time_t tim) 191 { 192 struct tm t; 193 194 (void)localtime_r(&tim, &t); 195 buf[0] = t.tm_year; 196 buf[1] = t.tm_mon+1; 197 buf[2] = t.tm_mday; 198 buf[3] = t.tm_hour; 199 buf[4] = t.tm_min; 200 buf[5] = t.tm_sec; 201 buf[6] = cd9660_compute_gm_offset(tim); 202 } 203