usr.sbin/makefs/cd9660/cd9660_conversion.c

   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 #if defined(__RCSID) && !defined(__lint)
  38 __RCSID("$NetBSD: cd9660_conversion.c,v 1.4 2007/03/14 14:11:17 christos 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, gm;
 154
 155         (void)localtime_r(&tim, &t);
 156         (void)gmtime_r(&tim, &gm);
 157         gm.tm_year -= t.tm_year;
 158         gm.tm_yday -= t.tm_yday;
 159         gm.tm_hour -= t.tm_hour;
 160         gm.tm_min  -= t.tm_min;
 161         if (gm.tm_year < 0)
 162                 gm.tm_yday = -1;
 163         else if (gm.tm_year > 0)
 164                 gm.tm_yday = 1;
 165
 166         return (char)(-(gm.tm_min + 60* (24 * gm.tm_yday + gm.tm_hour)) / 15);
 167 }
 168
 169 /* Long dates: 17 characters */
 170 void
 171 cd9660_time_8426(unsigned char *buf, time_t tim)
 172 {
 173         struct tm t;
 174         char temp[18];
 175
 176         (void)localtime_r(&tim, &t);
 177         (void)snprintf(temp, sizeof(temp), "%04i%02i%02i%02i%02i%02i%02i",
 178                 1900+(int)t.tm_year,
 179                 (int)t.tm_mon+1,
 180                 (int)t.tm_mday,
 181                 (int)t.tm_hour,
 182                 (int)t.tm_min,
 183                 (int)t.tm_sec,
 184                 0);
 185         (void)memcpy(buf, temp, 16);
 186         buf[16] = cd9660_compute_gm_offset(tim);
 187 }
 188
 189 /* Short dates: 7 characters */
 190 void
 191 cd9660_time_915(unsigned char *buf, time_t tim)
 192 {
 193         struct tm t;
 194
 195         (void)localtime_r(&tim, &t);
 196         buf[0] = t.tm_year;
 197         buf[1] = t.tm_mon+1;
 198         buf[2] = t.tm_mday;
 199         buf[3] = t.tm_hour;
 200         buf[4] = t.tm_min;
 201         buf[5] = t.tm_sec;
 202         buf[6] = cd9660_compute_gm_offset(tim);
 203 }