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      1 /*
      2  * hfsutils - tools for reading and writing Macintosh HFS volumes
      3  * Copyright (C) 1996, 1997 Robert Leslie
      4  *
      5  * This program is free software; you can redistribute it and/or modify
      6  * it under the terms of the GNU General Public License as published by
      7  * the Free Software Foundation; either version 2 of the License, or
      8  * (at your option) any later version.
      9  *
     10  * This program is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     13  * GNU General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU General Public License
     16  * along with this program; if not, write to the Free Software
     17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
     18  */
     19 
     20 # include <string.h>
     21 # include <time.h>
     22 
     23 # include "internal.h"
     24 # include "data.h"
     25 # include "btree.h"
     26 
     27 # define MUTDIFF  2082844800L
     28 
     29 static
     30 unsigned long tzdiff = -1;
     31 
     32 unsigned char hfs_charorder[256] = {
     33   0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
     34   0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
     35   0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
     36   0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
     37 
     38   0x20, 0x22, 0x23, 0x28, 0x29, 0x2a, 0x2b, 0x2c,
     39   0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
     40   0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e,
     41   0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46,
     42 
     43   0x47, 0x48, 0x58, 0x5a, 0x5e, 0x60, 0x67, 0x69,
     44   0x6b, 0x6d, 0x73, 0x75, 0x77, 0x79, 0x7b, 0x7f,
     45   0x8d, 0x8f, 0x91, 0x93, 0x96, 0x98, 0x9f, 0xa1,
     46   0xa3, 0xa5, 0xa8, 0xaa, 0xab, 0xac, 0xad, 0xae,
     47 
     48   0x54, 0x48, 0x58, 0x5a, 0x5e, 0x60, 0x67, 0x69,
     49   0x6b, 0x6d, 0x73, 0x75, 0x77, 0x79, 0x7b, 0x7f,
     50   0x8d, 0x8f, 0x91, 0x93, 0x96, 0x98, 0x9f, 0xa1,
     51   0xa3, 0xa5, 0xa8, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3,
     52 
     53   0x4c, 0x50, 0x5c, 0x62, 0x7d, 0x81, 0x9a, 0x55,
     54   0x4a, 0x56, 0x4c, 0x4e, 0x50, 0x5c, 0x62, 0x64,
     55   0x65, 0x66, 0x6f, 0x70, 0x71, 0x72, 0x7d, 0x89,
     56   0x8a, 0x8b, 0x81, 0x83, 0x9c, 0x9d, 0x9e, 0x9a,
     57 
     58   0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0x95,
     59   0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0x52, 0x85,
     60   0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8,
     61   0xc9, 0xca, 0xcb, 0x57, 0x8c, 0xcc, 0x52, 0x85,
     62 
     63   0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0x26,
     64   0x27, 0xd4, 0x20, 0x4a, 0x4e, 0x83, 0x87, 0x87,
     65   0xd5, 0xd6, 0x24, 0x25, 0x2d, 0x2e, 0xd7, 0xd8,
     66   0xa7, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
     67 
     68   0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
     69   0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
     70   0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
     71   0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
     72 };
     73 
     74 /*
     75  * NAME:	data->getb()
     76  * DESCRIPTION:	marshal 1 byte into local host format
     77  */
     78 char d_getb(unsigned char *ptr)
     79 {
     80   return (char) ptr[0];
     81 }
     82 
     83 /*
     84  * NAME:	data->getw()
     85  * DESCRIPTION:	marshal 2 bytes into local host format
     86  */
     87 short d_getw(unsigned char *ptr)
     88 {
     89   return (short)
     90     ((ptr[0] << 8) |
     91      (ptr[1] << 0));
     92 }
     93 
     94 /*
     95  * NAME:	data->getl()
     96  * DESCRIPTION:	marshal 4 bytes into local host format
     97  */
     98 long d_getl(unsigned char *ptr)
     99 {
    100   return (long)
    101     ((ptr[0] << 24) |
    102      (ptr[1] << 16) |
    103      (ptr[2] <<  8) |
    104      (ptr[3] <<  0));
    105 }
    106 
    107 /*
    108  * NAME:	data->putb()
    109  * DESCRIPTION:	marshal 1 byte out to Macintosh (big-endian) format
    110  */
    111 void d_putb(unsigned char *ptr, char data)
    112 {
    113   ptr[0] = (unsigned char) data;
    114 }
    115 
    116 /*
    117  * NAME:	data->putw()
    118  * DESCRIPTION:	marshal 2 bytes out to Macintosh (big-endian) format
    119  */
    120 void d_putw(unsigned char *ptr, short data)
    121 {
    122   ptr[0] = ((unsigned short) data & 0xff00) >> 8;
    123   ptr[1] = ((unsigned short) data & 0x00ff) >> 0;
    124 }
    125 
    126 /*
    127  * NAME:	data->putl()
    128  * DESCRIPTION:	marshal 4 bytes out to Macintosh (big-endian) format
    129  */
    130 void d_putl(unsigned char *ptr, long data)
    131 {
    132   ptr[0] = ((unsigned long) data & 0xff000000) >> 24;
    133   ptr[1] = ((unsigned long) data & 0x00ff0000) >> 16;
    134   ptr[2] = ((unsigned long) data & 0x0000ff00) >>  8;
    135   ptr[3] = ((unsigned long) data & 0x000000ff) >>  0;
    136 }
    137 
    138 /*
    139  * NAME:	data->fetchb()
    140  * DESCRIPTION:	incrementally retrieve a byte of data
    141  */
    142 void d_fetchb(unsigned char **ptr, char *dest)
    143 {
    144   *dest = d_getb(*ptr);
    145   *ptr += 1;
    146 }
    147 
    148 /*
    149  * NAME:	data->fetchw()
    150  * DESCRIPTION:	incrementally retrieve a word of data
    151  */
    152 void d_fetchw(unsigned char **ptr, short *dest)
    153 {
    154   *dest = d_getw(*ptr);
    155   *ptr += 2;
    156 }
    157 
    158 /*
    159  * NAME:	data->fetchl()
    160  * DESCRIPTION:	incrementally retrieve a long word of data
    161  */
    162 void d_fetchl(unsigned char **ptr, long *dest)
    163 {
    164   *dest = d_getl(*ptr);
    165   *ptr += 4;
    166 }
    167 
    168 /*
    169  * NAME:	data->fetchs()
    170  * DESCRIPTION:	incrementally retrieve a string
    171  */
    172 void d_fetchs(unsigned char **ptr, char *dest, int size)
    173 {
    174   int len;
    175   char blen;
    176 
    177   d_fetchb(ptr, &blen);
    178   len = blen;
    179 
    180   if (len > 0 && len < size)
    181     memcpy(dest, *ptr, len);
    182   else
    183     len = 0;
    184 
    185   dest[len] = 0;
    186 
    187   *ptr += size - 1;
    188 }
    189 
    190 /*
    191  * NAME:	data->storeb()
    192  * DESCRIPTION:	incrementally store a byte of data
    193  */
    194 void d_storeb(unsigned char **ptr, char data)
    195 {
    196   d_putb(*ptr, data);
    197   *ptr += 1;
    198 }
    199 
    200 /*
    201  * NAME:	data->storew()
    202  * DESCRIPTION:	incrementally store a word of data
    203  */
    204 void d_storew(unsigned char **ptr, short data)
    205 {
    206   d_putw(*ptr, data);
    207   *ptr += 2;
    208 }
    209 
    210 /*
    211  * NAME:	data->storel()
    212  * DESCRIPTION:	incrementally store a long word of data
    213  */
    214 void d_storel(unsigned char **ptr, long data)
    215 {
    216   d_putl(*ptr, data);
    217   *ptr += 4;
    218 }
    219 
    220 /*
    221  * NAME:	data->stores()
    222  * DESCRIPTION:	incrementally store a string
    223  */
    224 void d_stores(unsigned char **ptr, char *src, int size)
    225 {
    226   int len;
    227 
    228   len = strlen(src);
    229   if (len > --size)
    230     len = 0;
    231 
    232   d_storeb(ptr, (unsigned char) len);
    233 
    234   memcpy(*ptr, src, len);
    235   memset(*ptr + len, 0, size - len);
    236 
    237   *ptr += size;
    238 }
    239 
    240 /*
    241  * NAME:	calctzdiff()
    242  * DESCRIPTION:	calculate the timezone difference between local time and UTC
    243  */
    244 static
    245 void calctzdiff(void)
    246 {
    247   time_t t;
    248   int isdst;
    249   struct tm tm, *tmp;
    250 
    251   time(&t);
    252   isdst = localtime(&t)->tm_isdst;
    253 
    254   tmp = gmtime(&t);
    255   if (tmp)
    256     {
    257       tm = *tmp;
    258       tm.tm_isdst = isdst;
    259 
    260       tzdiff = t - mktime(&tm);
    261     }
    262   else
    263     tzdiff = 0;
    264 }
    265 
    266 /*
    267  * NAME:	data->tomtime()
    268  * DESCRIPTION:	convert UNIX time to Macintosh time
    269  */
    270 unsigned long d_tomtime(unsigned long secs)
    271 {
    272   time_t utime = secs;
    273 
    274   if (tzdiff == -1)
    275     calctzdiff();
    276 
    277   return utime + tzdiff + MUTDIFF;
    278 }
    279 
    280 /*
    281  * NAME:	data->toutime()
    282  * DESCRIPTION:	convert Macintosh time to UNIX time
    283  */
    284 unsigned long d_toutime(unsigned long secs)
    285 {
    286   time_t utime = secs;
    287 
    288   if (tzdiff == -1)
    289     calctzdiff();
    290 
    291   return utime - MUTDIFF - tzdiff;
    292 }
    293 
    294 /*
    295  * NAME:	data->relstring()
    296  * DESCRIPTION:	compare two strings as per MacOS for HFS
    297  */
    298 int d_relstring(char *str1, char *str2)
    299 {
    300   int diff;
    301 
    302   while (*str1 && *str2)
    303     {
    304       diff = hfs_charorder[(unsigned char) *str1] -
    305 	     hfs_charorder[(unsigned char) *str2];
    306 
    307       if (diff)
    308 	return diff;
    309 
    310       ++str1, ++str2;
    311     }
    312 
    313   if (! *str1 && *str2)
    314     return -1;
    315   else if (*str1 && ! *str2)
    316     return 1;
    317 
    318   return 0;
    319 }
    320