1/* $NetBSD: cd9660_conversion.c,v 1.4 2007/03/14 14:11:17 christos 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__FBSDID("$FreeBSD$"); 38 39static char cd9660_compute_gm_offset(time_t); 40 41#if 0 42static inline int 43cd9660_pad_even(length) 44int 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 */ 55void 56cd9660_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 64void 65cd9660_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 */ 74void 75cd9660_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 83void 84cd9660_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*/ 98void 99cd9660_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*/ 120void 121cd9660_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 136void 137cd9660_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 147static char 148cd9660_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 */ 167void 168cd9660_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 */ 187void 188cd9660_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