cd9660_conversion.c revision 1.2
1 /* $NetBSD: cd9660_conversion.c,v 1.2 2005/10/30 03:10:28 dyoung Exp $ */ 2 3 /* 4 * Copyright (c) 2005 Daniel Watt, Walter Deignan, Ryan Gabrys, Alan 5 * Perez-Rathke and Ram Vedam. All rights reserved. 6 * 7 * This code was written by Daniel Watt, Walter Deignan, Ryan Gabrys, 8 * Alan Perez-Rathke and Ram Vedam. 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer in the documentation and/or other materials provided 18 * with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY DANIEL WATT, WALTER DEIGNAN, RYAN 21 * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 24 * DISCLAIMED. IN NO EVENT SHALL DANIEL WATT, WALTER DEIGNAN, RYAN 25 * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 28 * USE,DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 29 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 32 * OF SUCH DAMAGE. 33 */ 34 #include "cd9660.h" 35 36 #include <sys/cdefs.h> 37 #if defined(__RCSID) && !defined(__lint) 38 __RCSID("$NetBSD: cd9660_conversion.c,v 1.2 2005/10/30 03:10:28 dyoung Exp $"); 39 #endif /* !__lint */ 40 41 42 static char cd9660_compute_gm_offset(time_t); 43 44 #if 0 45 static __inline int 46 cd9660_pad_even(length) 47 int length; 48 { 49 return length + (length & 0x01); 50 } 51 #endif 52 53 /* 54 * These can probably be implemented using a macro 55 */ 56 57 /* Little endian */ 58 void 59 cd9660_721(uint16_t w, unsigned char *twochar) 60 { 61 #if BYTE_ORDER == BIG_ENDIAN 62 w = bswap16(w); 63 #endif 64 memcpy(twochar,&w,2); 65 } 66 67 void 68 cd9660_731(uint32_t w, unsigned char *fourchar) 69 { 70 #if BYTE_ORDER == BIG_ENDIAN 71 w = bswap32(w); 72 #endif 73 memcpy(fourchar,&w,4); 74 } 75 76 /* Big endian */ 77 void 78 cd9660_722(uint16_t w, unsigned char *twochar) 79 { 80 #if BYTE_ORDER == LITTLE_ENDIAN 81 w = bswap16(w); 82 #endif 83 memcpy(twochar,&w,2); 84 } 85 86 void 87 cd9660_732(uint32_t w, unsigned char *fourchar) 88 { 89 #if BYTE_ORDER == LITTLE_ENDIAN 90 w = bswap32(w); 91 #endif 92 memcpy(fourchar,&w,4); 93 } 94 95 /** 96 * Convert a dword into a double endian string of eight characters 97 * @param int The double word to convert 98 * @param char* The string to write the both endian double word to - It is assumed this is allocated and at least 99 * eight characters long 100 */ 101 void 102 cd9660_bothendian_dword(uint32_t dw, unsigned char *eightchar) 103 { 104 uint32_t le, be; 105 #if BYTE_ORDER == LITTLE_ENDIAN 106 le = dw; 107 be = bswap32(dw); 108 #endif 109 #if BYTE_ORDER == BIG_ENDIAN 110 be = dw; 111 le = bswap32(dw); 112 #endif 113 memcpy(eightchar, &le, 4); 114 memcpy((eightchar+4), &be, 4); 115 } 116 117 /** 118 * Convert a word into a double endian string of four characters 119 * @param int The word to convert 120 * @param char* The string to write the both endian word to - It is assumed this is allocated and at least 121 * four characters long 122 */ 123 void 124 cd9660_bothendian_word(uint16_t dw, unsigned char *fourchar) 125 { 126 uint16_t le, be; 127 #if BYTE_ORDER == LITTLE_ENDIAN 128 le = dw; 129 be = bswap16(dw); 130 #endif 131 #if BYTE_ORDER == BIG_ENDIAN 132 be = dw; 133 le = bswap16(dw); 134 #endif 135 memcpy(fourchar, &le, 2); 136 memcpy((fourchar+2), &be, 2); 137 } 138 139 void 140 cd9660_pad_string_spaces(char *str, int len) 141 { 142 int i; 143 144 for (i = 0; i < len; i ++) { 145 if (str[i] == '\0') 146 str[i] = 0x20; 147 } 148 } 149 150 static char 151 cd9660_compute_gm_offset(time_t tim) 152 { 153 struct tm* t; 154 struct tm* gm; 155 156 t = localtime(&tim); 157 gm = gmtime(&tim); 158 gm->tm_year -= t->tm_year; 159 gm->tm_yday -= t->tm_yday; 160 gm->tm_hour -= t->tm_hour; 161 gm->tm_min -= t->tm_min; 162 if (gm->tm_year < 0) 163 gm->tm_yday = -1; 164 else if (gm->tm_year > 0) 165 gm->tm_yday = 1; 166 167 return (char)(-(gm->tm_min + 60* (24 * gm->tm_yday + gm->tm_hour)) / 15); 168 } 169 170 /* Long dates: 17 characters */ 171 void 172 cd9660_time_8426(unsigned char *buf, time_t tim) 173 { 174 struct tm *t; 175 char temp[18]; 176 177 t = localtime(&tim); 178 sprintf(temp,"%04i%02i%02i%02i%02i%02i%02i", 179 1900+(int)t->tm_year, 180 (int)t->tm_mon+1, 181 (int)t->tm_mday, 182 (int)t->tm_hour, 183 (int)t->tm_min, 184 (int)t->tm_sec, 185 0); 186 memcpy(buf, temp, 16); 187 buf[16] = cd9660_compute_gm_offset(tim); 188 } 189 190 /* Short dates: 7 characters */ 191 void 192 cd9660_time_915(unsigned char *buf, time_t tim) 193 { 194 struct tm *t; 195 t = localtime(&tim); 196 197 buf[0] = t->tm_year; 198 buf[1] = t->tm_mon+1; 199 buf[2] = t->tm_mday; 200 buf[3] = t->tm_hour; 201 buf[4] = t->tm_min; 202 buf[5] = t->tm_sec; 203 buf[6] = cd9660_compute_gm_offset(tim); 204 } 205
Indexes created Wed Oct 22 00:09:40 GMT 2025