commands/isoread/isoread.c

   1 /*
   2  * isoread.c
   3  *
   4  * isoread reads a file system in ISO9660 or HIGH SIERRA format from
   5  * a given device.
   6  *
   7  * Apr  5 1995    Michel R. Prevenier
   8  * Nov 16 1996    Kees J. Bot        -- bug fix: isoread filename matching
   9  * Dec  7 1997    Albert S. Woodhull -- bug fix: return values
  10  *                                       "   " : isodir filename handling
  11  *                                   -- added  : isoread -a option
  12  * Mar 21 2000    Michael A. Temari  -- bug fix: look_up only searched first
  13  *                                             : block of directory
  14  *                                             : stack overflow in recurse_dir
  15  *                                             : and various other bugs
  16  * Apr 14 2002    Michael A. Temari  -- bug fix: fixed recursing directories
  17  *                                             : and printing dates 2000 and
  18  *                                             : later
  19  * May 14 2002    Kees J. Bot        -- bug fix: fixed error messages
  20  * Mar 14 2003    Kees J. Bot        -- added  : iso{dir,read} -B option
  21  * Jul 24 2003    Michael A. Temari  -- bug fix: bytes to blocks roundup fix
  22  */
  23
  24 #include <ctype.h>
  25 #include <errno.h>
  26 #include <limits.h>
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <fcntl.h>
  30 #include <stdlib.h>
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include <time.h>
  34 #include <sys/times.h>
  35 #include <unistd.h>
  36
  37 /*
  38  *  definitions used by the ISO9660 and HIGH SIERRA file system
  39  */
  40
  41 #define ISO9660_ID      "CD001"
  42 #define HIGH_SIERRA_ID  "CDROM"
  43 #define BLOCK_SIZE      2048
  44 #define BLOCK_SHIFT     11
  45
  46
  47 /* Fields in a ISO9660 volume descriptor */
  48 struct iso9660_descriptor
  49 {
  50   char type[1];
  51   char id[5];
  52   char version[1];
  53   char reserved1[1];
  54   char system_id[32];
  55   char volume_id[32];
  56   char reserved2[8];
  57   char volume_size[8];
  58   char reserved3[32];
  59   char volume_set_size[4];
  60   char volume_seq_nr[4];
  61   char block_size[4];
  62   char path_table_size[8];
  63   char type_l_path_table[4];
  64   char opt_type_l_path_table[4];
  65   char type_m_path_table[4];
  66   char opt_type_m_path_table[4];
  67   char root_dir_entry[34];
  68   char vol_set_id[128];
  69   char publ_id[128];
  70   char prep_id[128];
  71   char appl_id[128];
  72   char copyright_file_id[37];
  73   char abstract_file_id[37];
  74   char bibl_file_id[37];
  75   char creation_date[17];
  76   char mod_date[17];
  77   char exp_date[17];
  78   char eff_date[17];
  79   char file_struc_version[1];
  80   char reserved4[1];
  81   char appl_data[512];
  82   char reserved5[653];
  83 };
  84
  85
  86 /* Fields in a High Sierra volume descriptor */
  87 struct high_sierra_descriptor
  88 {
  89   char reserved1[8];
  90   char type[1];
  91   char id[5];
  92   char version[1];
  93   char reserved2[1];
  94   char system_id[32];
  95   char volume_id[32];
  96   char reserved3[8];
  97   char volume_size[8];
  98   char reserved4[32];
  99   char vol_set_size[4];
 100   char volume_seq_nr[4];
 101   char block_size[4];
 102   char path_table_size[8];
 103   char type_l_path_table[4];
 104   char reserved5[28];
 105   char root_dir_entry[34];
 106 };
 107
 108
 109 /* Fields in a directory entry */
 110 struct dir_entry
 111 {
 112   char length[1];
 113   char ext_attr_length[1];
 114   char first_block[8];
 115   char size[8];
 116   char date[7];
 117   char flags[1];
 118   char file_unit_size[1];
 119   char interleave[1];
 120   char volume_seq_nr[4];
 121   char name_length[1];
 122   char name[1];
 123 };
 124
 125
 126 #define STDOUT          stdout
 127 #define STDERR          stderr
 128 #define NULL_DIR        (struct dir_entry *) 0
 129 #define MAX_NAME_LENGTH 255
 130 #define MAX_PATH_LENGTH 1024
 131
 132 #define NR_OF_CHARS     13
 133 #define NR_OF_BLANKS    2
 134 #define NR_OF_COLS      (80 / (NR_OF_CHARS + NR_OF_BLANKS))
 135
 136 /* This macro always returns a lower case character */
 137 #define LOWER_CASE(CHR) (CHR >= 'A' && CHR <= 'Z' ? CHR | 0x20 : CHR)
 138
 139 /* Macro's for determining . , .. and normal directory entries */
 140 #define IS_DOT(PTR) (PTR->name_length[0] == 1 && PTR->name[0] == 0 ? 1 : 0)
 141 #define IS_DOT_DOT(PTR) (PTR->name_length[0] == 1 && PTR->name[0] == 1 ? 1 : 0)
 142 #define IS_DIR(PTR) (PTR->flags[-High_Sierra] & 2 ? 1 : 0)
 143
 144
 145 int main(int argc, char **argv);
 146 int iso_cmp(char *name, struct dir_entry *dir_ptr, int dir_flag);
 147 void list_dir(struct dir_entry *dir_ptr);
 148 void list_file(struct dir_entry *dir_ptr);
 149 struct dir_entry *look_up(char *name);
 150 void recurse_dir(char *path, struct dir_entry *dir_ptr);
 151 void read_device(long offset, int nr_of_bytes, char *buffer);
 152 int valid_fs(void);
 153 void usage(void);
 154 void print_date(char *date);
 155 void print_dir_date(char *date);
 156 void iso_info(struct iso9660_descriptor *vol_desc);
 157 void hs_info(struct high_sierra_descriptor *vol_desc);
 158 int iso_711(char *c);
 159 int iso_712(char *c);
 160 int iso_721(char *c);
 161 int iso_722(char *c);
 162 int iso_723(char *c);
 163 long iso_731(char *c);
 164 long iso_732(char *c);
 165 long iso_733(char *c);
 166
 167
 168 char Buffer[BLOCK_SIZE];                    /* buffer to hold read data */
 169 int Device;                                 /* global file descriptor */
 170 struct iso9660_descriptor *Iso_Vol_Desc;    /* iso9660 volume descriptor */
 171 struct high_sierra_descriptor *Hs_Vol_Desc; /* high sierra volume descriptor */
 172 int High_Sierra = 0;                        /* 1 = high sierra format */
 173 int Iso9660 = 0;                            /* 1 = iso9660 format */
 174
 175 /* This comes in handy when printing the date */
 176 char months[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
 177
 178 /* Flags displaying what to do  */
 179 int Read_File = 0;      /* 1 = Read file */
 180 int Read_Dir = 0;       /* 1 = Read directory entry */
 181 int Read_Info = 0;      /* 1 = Read volume descriptor */
 182 int Recurse = 0;        /* 1 = Recursively descend directories */
 183 int Verbose = 0;        /* 1 = Print all info on directories */
 184 int ByteOffset = 0;     /* 1 = Print byte offset and length of files */
 185 int Aflag = 0;          /* 1 = Suppress output of \r  */
 186
 187 int iso_cmp(name, dir_ptr, dir_flag)
 188 char *name;
 189 struct dir_entry *dir_ptr;
 190 int dir_flag;
 191 {
 192 /* Compare name with directory entries, looking for match with a dirname.
 193  * An iso9660 filename is terminated by ";n", where n will probably
 194  * be 1. A directory name is not terminated by anything special, it may be
 195  * followed by a \0 if padding is needed to put the following directory
 196  * entry on an even address.
 197  */
 198   int i;
 199   int len;
 200
 201   /* First match the filename */
 202   len = strlen(name);
 203   if (len > iso_711(dir_ptr->name_length)) return 1;
 204   for (i = 0; i < len; i++)
 205   {
 206     if (dir_ptr->name[i] == ';') return 1;      /* found end of a filename */
 207     if (name[i] != LOWER_CASE(dir_ptr->name[i])) return 1; /* match failed */
 208   }
 209   if (dir_ptr->name[i] != ';' && i != len) return 1; /* incomplete match */
 210
 211   /* The filename is ok, now look at the file type */
 212   if (dir_flag && !IS_DIR(dir_ptr)) return 1;  /* File type not correct */
 213
 214   return 0;
 215 }
 216
 217
 218 void usage()
 219 {
 220   if (Read_Dir)
 221    fprintf (STDERR, "Usage: isodir [-lrB] inputfile [dir]\n");
 222   else if (Read_Info)
 223    fprintf (STDERR, "Usage: isoinfo inputfile\n");
 224   else
 225    fprintf (STDERR, "Usage: isoread [-a] inputfile file\n");
 226   exit(1);
 227 }
 228
 229
 230 int main(argc, argv)
 231 int argc;
 232 char **argv;
 233 {
 234   struct dir_entry *entry;
 235   char path[MAX_PATH_LENGTH];
 236   char *input_file;
 237   char *basename;
 238   char *file_name;
 239   int i,j;
 240
 241   /* Read arguments */
 242   basename = argv[0];
 243   while (*argv[0] != '\0')
 244     if (*argv[0]++ == '/') basename = argv[0];
 245
 246   if (strcmp(basename,"isodir") == 0) Read_Dir = 1;
 247   else if (strcmp(basename,"isoinfo") == 0) Read_Info = 1;
 248   else Read_File = 1;
 249
 250   if ((argc > 5 && Read_Dir) || (argc != 2 && Read_Info) ||
 251      (argc > 4 && Read_File)) usage();
 252
 253   i = 1;
 254
 255   while (i < argc && argv[i][0] == '-')
 256   {
 257     char *opt = argv[i++] + 1;
 258
 259     if (opt[0] == '-' && opt[1] == '\0') break;
 260
 261     while (*opt != '\0')
 262     {
 263       if (Read_Info) usage();
 264       if (Read_Dir)
 265       switch (*opt++)
 266       {
 267         case 'r':       Recurse = 1; break;
 268         case 'l':       Verbose = 1; break;
 269         case 'B':       ByteOffset = 1; break;
 270         default:        usage();
 271       }
 272       if (Read_File)
 273       switch (*opt++)
 274       {
 275         case 'a':       Aflag = 1; break;
 276         case 'B':       ByteOffset = 1; break;
 277         default:        usage();
 278       }
 279     }
 280   }
 281
 282   if (i >= argc) usage();
 283   input_file = argv[i++];
 284
 285   if (Read_File)
 286   {
 287     if (i >= argc) usage();
 288     file_name = argv[i++];
 289   }
 290
 291   if (Read_Dir)
 292   {
 293     file_name = "/";
 294     if (i < argc)
 295     {
 296       file_name = argv[i++];
 297     }
 298   }
 299
 300   if (i < argc) usage();
 301
 302   if (Read_File || Read_Dir)
 303   {
 304     for (i=0; file_name[i] != '\0'; i++)
 305       path[i] = LOWER_CASE(file_name[i]);
 306     path[i] = '\0';
 307   }
 308
 309   /* Open file system (file or device) */
 310   if ((Device = open(input_file, O_RDONLY)) < 0)
 311   {
 312     fprintf (STDERR, "cannot open %s: %s\n", input_file, strerror(errno));
 313     exit(-1);
 314   }
 315
 316
 317   if (!valid_fs())
 318   {
 319     fprintf (STDERR, "File system not in ISO9660 or HIGH SIERRA format \n");
 320     exit(-1);
 321   }
 322
 323
 324   if (Read_Info)
 325   {
 326     if (Iso9660)
 327       iso_info(Iso_Vol_Desc);
 328     else
 329       hs_info(Hs_Vol_Desc);
 330     exit(0);
 331   }
 332
 333   /* Lookup file */
 334   if ((entry = look_up(path)) != NULL_DIR)
 335   {
 336     if (Read_Dir)
 337       if (Recurse) recurse_dir(path,entry);
 338       else list_dir(entry);
 339     else
 340       list_file(entry);
 341   }
 342   else
 343   {
 344     if (Read_Dir)
 345       fprintf (STDERR, "Directory");
 346     else
 347       fprintf (STDERR, "File");
 348     fprintf (STDERR, " %s not found\n", path);
 349     exit(-1);
 350   }
 351   return 0;
 352 }
 353
 354
 355 struct dir_entry *look_up(path)
 356 char *path;
 357 {
 358   /* Lookup a file name */
 359
 360   struct dir_entry *dir_ptr;
 361   long block;
 362   int nr_of_blocks;
 363   int offset;
 364   char name[MAX_NAME_LENGTH + 1];
 365   int name_index = 0;
 366   int last_in_path = 0;
 367   int found;
 368   int i,j;
 369
 370   /* Get the right dir entry structure */
 371   if (Iso9660)
 372     dir_ptr = (struct dir_entry *) Iso_Vol_Desc->root_dir_entry;
 373   else
 374     dir_ptr = (struct dir_entry *) Hs_Vol_Desc->root_dir_entry;
 375
 376   /* If we look for the root we already have the right entry */
 377   if (path[0] == '/')
 378     if (strlen(path) == 1) return dir_ptr;
 379     else name_index = 1; /* first name in path */
 380
 381   /* Keep searching for the path elements until all are found */
 382   while (!last_in_path)
 383   {
 384     /* Get next name in path */
 385     for (i = name_index; i < strlen(path); i++)
 386     {
 387       if (path[i] == '/') break;
 388       name[i - name_index] = path[i];
 389     }
 390     last_in_path =
 391            (i == strlen(path) || (i == strlen(path) - 1 && path[i] == '/'));
 392     name[i-name_index] = '\0';
 393     name_index = i + 1;
 394
 395     /* Get block of next directory */
 396     block = iso_733(dir_ptr->first_block) + iso_711(dir_ptr->ext_attr_length);
 397     nr_of_blocks = (iso_733(dir_ptr->size) + (BLOCK_SIZE-1)) >> BLOCK_SHIFT;
 398
 399     /* Search for file in dir entry */
 400     found = 0;
 401     for (j=0; j < nr_of_blocks && !found; j++)
 402     {
 403       /* Read a directory block */
 404       read_device(block*BLOCK_SIZE, BLOCK_SIZE, Buffer);
 405       block++;
 406
 407       dir_ptr = (struct dir_entry *) Buffer;
 408
 409       offset = 0;
 410       /* Compare with all entries in this block */
 411       while (iso_711(dir_ptr->length) > 0 && offset < BLOCK_SIZE)
 412       {
 413         if (iso_cmp(name, dir_ptr,
 414             (Read_Dir || (!Read_Dir && !last_in_path))) == 0)
 415         {
 416           found = 1;
 417           break;
 418         }
 419         /* Next entry */
 420         offset += iso_711(dir_ptr->length);
 421         dir_ptr = (struct dir_entry *) (Buffer + offset);
 422       }
 423     }
 424     if (!found) return NULL_DIR;   /* path element not found */
 425   }
 426   return dir_ptr;
 427 }
 428
 429
 430 void recurse_dir(path, dir_ptr)
 431 char *path;
 432 struct dir_entry *dir_ptr;
 433 {
 434   /* Recursively descend all directories starting with dir_ptr */
 435
 436   char tmp_path[MAX_PATH_LENGTH];
 437   int i,j, path_length;
 438   long block, saveblock, dblock;
 439   int nr_of_blocks;
 440   int offset = 0;
 441
 442
 443   /* Save block number and nr of blocks of current dir entry because
 444    * list_dir changes dir_ptr
 445    */
 446   block = iso_733(dir_ptr->first_block) + iso_711(dir_ptr->ext_attr_length);
 447   nr_of_blocks = (iso_733(dir_ptr->size) + (BLOCK_SIZE-1)) >> BLOCK_SHIFT;
 448
 449   /* Add a trailing / to path if necessary */
 450   path_length = strlen(path);
 451   if (path[path_length-1] != '/')
 452   {
 453     path[path_length++] = '/';
 454     path[path_length] = '\0';
 455   }
 456
 457   /* Print current path of directory, and list contents of directory */
 458   fprintf(STDOUT,"directory %s:\n\n", path);
 459   list_dir(dir_ptr);
 460   fprintf(STDOUT,"\n\n");
 461
 462   for (j=0; j < nr_of_blocks; j++)
 463   {
 464     read_device(block*BLOCK_SIZE, BLOCK_SIZE, Buffer);
 465     saveblock = block++;
 466
 467     /* Save buffer, because the next recursive call destroys
 468      * the global Buffer
 469      */
 470     dir_ptr = (struct dir_entry *) Buffer;
 471
 472     /* Search this dir entry for directories */
 473     offset = 0;
 474     while (iso_711(dir_ptr->length) != 0 && offset < BLOCK_SIZE)
 475     {
 476       /* Is current file a directory and not the . or .. entries */
 477       if (IS_DIR(dir_ptr)  && !IS_DOT(dir_ptr) && !IS_DOT_DOT(dir_ptr))
 478       {
 479         /* setup path for next recursive call */
 480         for (i=0; i<path_length; i++) tmp_path[i] = path[i];
 481         for (i=0;i<iso_711(dir_ptr->name_length) && dir_ptr->name[i] != ';';i++)
 482           tmp_path[i+path_length] = LOWER_CASE(dir_ptr->name[i]);
 483         tmp_path[i+path_length] = '/';
 484         tmp_path[i+1+path_length] = '\0';
 485
 486         /* Read block of directory we found */
 487         dblock = iso_733(dir_ptr->first_block);
 488         read_device(dblock*BLOCK_SIZE, BLOCK_SIZE, Buffer);
 489
 490         /* And start all over again with this entry */
 491         recurse_dir(tmp_path, (struct dir_entry *) Buffer);
 492
 493         /* get the block we were looking at */
 494         read_device(saveblock*BLOCK_SIZE, BLOCK_SIZE, Buffer);
 495       }
 496
 497       /* Go to the next file in this directory */
 498       offset += iso_711(dir_ptr->length);
 499       dir_ptr = (struct dir_entry *) (Buffer + offset);
 500     }
 501   }
 502 }
 503
 504
 505 void list_dir(dir_ptr)
 506 struct dir_entry *dir_ptr;
 507 {
 508   /* List all entries in a directory */
 509   int tty;
 510   long block;
 511   int nr_of_blocks;
 512   int i,j;
 513   int offset = 0;
 514   char name[NR_OF_CHARS+NR_OF_BLANKS+1];
 515   int name_len;
 516   int column = 0;
 517   int skip = 0;
 518
 519   tty = isatty(STDOUT_FILENO);
 520   /* Get first block of directory */
 521   block = iso_733(dir_ptr->first_block) + iso_711(dir_ptr->ext_attr_length);
 522   nr_of_blocks = (iso_733(dir_ptr->size) + (BLOCK_SIZE-1)) >> BLOCK_SHIFT;
 523
 524   /* Read all directory blocks and display their contents */
 525   for (j=0; j < nr_of_blocks; j++)
 526   {
 527     read_device(block*BLOCK_SIZE, BLOCK_SIZE, Buffer);
 528     block++;
 529
 530     dir_ptr = (struct dir_entry *) (Buffer);
 531     offset = 0;
 532     while (iso_711(dir_ptr->length) != 0 && offset < BLOCK_SIZE)
 533     {
 534       name_len = 0;
 535       if (IS_DOT(dir_ptr))
 536       {
 537         name[name_len++] =  '.';
 538         if (!Verbose) skip = 1;
 539       }
 540       else
 541       {
 542         if (IS_DOT_DOT(dir_ptr))
 543         {
 544           name[name_len++] =  '.';
 545           name[name_len++] =  '.';
 546           if (!Verbose) skip = 1;
 547         }
 548         else
 549         {
 550           for (i=0; i<iso_711(dir_ptr->name_length) &&
 551                     i<NR_OF_CHARS; i++)
 552           {
 553             if (dir_ptr->name[i] == ';') break;
 554             name[name_len++] = LOWER_CASE(dir_ptr->name[i]);
 555           }
 556           if (IS_DIR(dir_ptr) && tty) name[name_len++] = '/';
 557         }
 558       }
 559       if (!skip)
 560       {
 561         if (ByteOffset)
 562         {
 563           fprintf (STDOUT, "%10ld ",
 564             (iso_733(dir_ptr->first_block) + iso_711(dir_ptr->ext_attr_length))
 565               * BLOCK_SIZE);
 566         }
 567         if (Verbose || ByteOffset)
 568         {
 569           fprintf (STDOUT, "%10ld ",  iso_733(dir_ptr->size));
 570         }
 571         if (Verbose)
 572         {
 573           print_dir_date(dir_ptr->date);
 574           fprintf (STDOUT, " ");
 575         }
 576         if(!tty)
 577                 name[name_len] = '\0';
 578         else {
 579                 for(i=name_len; i<(NR_OF_CHARS+NR_OF_BLANKS); i++) name[i] = ' ';
 580                 name[NR_OF_CHARS+NR_OF_BLANKS] = '\0';
 581         }
 582         fprintf(STDOUT, "%s", name);
 583         if (!(Verbose || ByteOffset))
 584         {
 585           column++;
 586           if (column >= NR_OF_COLS || !tty)
 587           {
 588             column = 0;
 589             fprintf(STDOUT,"\n");
 590           }
 591         }
 592         else fprintf(STDOUT,"\n");
 593       }
 594       skip = 0;
 595       offset += iso_711(dir_ptr->length);
 596       dir_ptr = (struct dir_entry *) (Buffer+offset);
 597     }
 598   }
 599   if (!Verbose && column) fprintf(STDOUT,"\n");
 600 }
 601
 602
 603 void print_dir_date(date)
 604 char *date;
 605 {
 606   /* Print date in a directory entry */
 607
 608   int m;
 609
 610   m = iso_711(&date[1]) - 1;
 611   if(m < 0 || m > 11)
 612         fprintf(STDOUT, "   ");
 613   else
 614         fprintf(STDOUT,"%.3s",&months[m*3]);
 615
 616   fprintf (STDOUT, " %02d %04d %02d:%02d:%02d",
 617            date[2],
 618            1900+date[0],
 619            date[3],
 620            date[4],
 621            date[5]);
 622 }
 623
 624
 625 void list_file(dir_ptr)
 626 struct dir_entry *dir_ptr;
 627 {
 628   /* List contents of a file */
 629
 630   int i;
 631   long block;
 632   long size;
 633   char c;
 634
 635   block = iso_733(dir_ptr->first_block);
 636   size = iso_733(dir_ptr->size);
 637
 638   if (ByteOffset) {
 639     fprintf(STDOUT, "%ld %ld\n", block*BLOCK_SIZE, size);
 640     return;
 641   }
 642
 643   while (size > 0)
 644   if (Aflag == 1) {
 645     read_device(block*BLOCK_SIZE, BLOCK_SIZE, Buffer);
 646       for (i=0; ((i < size) && (i < BLOCK_SIZE)); i++)
 647         if (Buffer[i] != '\r') fprintf(STDOUT, "%c", Buffer[i]);
 648     size-= BLOCK_SIZE;
 649     block++;
 650   } else {
 651     read_device(block*BLOCK_SIZE, BLOCK_SIZE, Buffer);
 652       for (i=0; ((i < size) && (i < BLOCK_SIZE)); i++)
 653         fprintf(STDOUT, "%c", Buffer[i]);
 654     size-= BLOCK_SIZE;
 655     block++;
 656   }
 657 }
 658
 659
 660 void print_date(date)
 661 char *date;
 662 {
 663   /* Print the date in a volume descriptor */
 664
 665   fprintf (STDOUT, "%c%c-%c%c-%c%c%c%c %c%c:%c%c:%c%c",
 666            date[4],
 667            date[5],
 668            date[6],
 669            date[7],
 670            date[0],
 671            date[1],
 672            date[2],
 673            date[3],
 674            date[8],
 675            date[9],
 676            date[10],
 677            date[11],
 678            date[12],
 679            date[13]);
 680 }
 681
 682 void iso_info(vol_desc)
 683 struct iso9660_descriptor *vol_desc;
 684 {
 685   int i;
 686
 687   fprintf (STDOUT, "Format: ISO9660 \n");
 688   fprintf (STDOUT, "System id: ");
 689   for (i=0; i< sizeof(vol_desc->system_id); i++)
 690     fprintf(STDOUT, "%c", vol_desc->system_id[i]);
 691   fprintf (STDOUT, "\n");
 692   fprintf (STDOUT, "Volume id: ");
 693   for (i=0; i< sizeof(vol_desc->volume_id); i++)
 694     fprintf(STDOUT, "%c", vol_desc->volume_id[i]);
 695   fprintf (STDOUT, "\n");
 696   fprintf (STDOUT, "Volume size: %ld Kb\n", iso_733(vol_desc->volume_size)*2);
 697   fprintf (STDOUT, "Block size: %d bytes \n", iso_723(vol_desc->block_size));
 698   fprintf (STDOUT, "Creation date: ");
 699   print_date(vol_desc->creation_date);
 700   fprintf(STDOUT, "\n");
 701   fprintf (STDOUT, "Modification date: ");
 702   print_date(vol_desc->mod_date);
 703   fprintf (STDOUT, "\n");
 704   fprintf (STDOUT, "Expiration date: ");
 705   print_date(vol_desc->exp_date);
 706   fprintf (STDOUT, "\n");
 707   fprintf (STDOUT, "Effective date: ");
 708   print_date(vol_desc->eff_date);
 709   fprintf (STDOUT, "\n");
 710 }
 711
 712
 713 void hs_info(vol_desc)
 714 struct high_sierra_descriptor *vol_desc;
 715 {
 716   int i;
 717
 718   fprintf (STDOUT, "Format: HIGH SIERRA \n");
 719   fprintf (STDOUT, "System id: ");
 720   for (i=0; i< sizeof(vol_desc->system_id); i++)
 721     fprintf(STDOUT, "%c", vol_desc->system_id[i]);
 722   fprintf (STDOUT, "\n");
 723   fprintf (STDOUT, "Volume id: ");
 724   for (i=0; i< sizeof(vol_desc->volume_id); i++)
 725     fprintf(STDOUT, "%c", vol_desc->volume_id[i]);
 726   fprintf (STDOUT, "\n");
 727   fprintf (STDOUT, "Volume size: %ld Kb\n", (iso_733(vol_desc->volume_size)*2));
 728   fprintf (STDOUT, "Block size: %d bytes \n", iso_723(vol_desc->block_size));
 729 }
 730
 731
 732 int valid_fs()
 733 {
 734
 735   int i;
 736
 737   /* search for a volume descriptor */
 738   for (i=16; i<100; i++)
 739   {
 740
 741     read_device((long)(i)*BLOCK_SIZE, BLOCK_SIZE, Buffer);
 742
 743     Iso_Vol_Desc = (struct iso9660_descriptor *) Buffer;
 744     Hs_Vol_Desc = (struct high_sierra_descriptor *) Buffer;
 745
 746     if (strncmp(Iso_Vol_Desc->id, ISO9660_ID, sizeof Iso_Vol_Desc->id) == 0)
 747     {
 748       /* iso_info(Iso_Vol_Desc); */
 749       Iso9660 = 1;
 750       break;
 751     }
 752
 753     if (strncmp(Hs_Vol_Desc->id, HIGH_SIERRA_ID, sizeof Hs_Vol_Desc->id) == 0)
 754     {
 755       /* hs_info(Hs_Vol_Desc); */
 756       High_Sierra = 1;
 757       break;
 758     }
 759   }
 760
 761   if (i >= 100) return 0;
 762   return 1;
 763 }
 764
 765
 766 void read_device(offset, nr_of_bytes, buffer)
 767 long offset;
 768 int nr_of_bytes;
 769 char *buffer;
 770 {
 771   int bytes_read;
 772
 773   if (lseek(Device, offset, SEEK_SET) == -1)
 774   {
 775         fflush (stdout);
 776         fprintf (STDERR, "seek error: %s\n", strerror(errno));
 777         exit(1);
 778   }
 779
 780   bytes_read = read(Device, buffer, nr_of_bytes);
 781   if (bytes_read != nr_of_bytes)
 782   {
 783         fprintf (STDERR, "read error: %s\n",
 784             bytes_read >= 0 ? "Short read" : strerror(errno));
 785         exit (1);
 786   }
 787 }
 788
 789
 790 /* The ISO9660 functions */
 791
 792 int iso_711 (c)
 793 char *c;
 794 {
 795   return (*c & 0xff);
 796 }
 797
 798
 799 int iso_712 (c)
 800 char *c;
 801 {
 802   int n;
 803
 804   n = *c;
 805   if (n & 0x80) n |= 0xffffff00;
 806   return n;
 807 }
 808
 809 int iso_721 (c)
 810 char *c;
 811 {
 812   return ((c[0] & 0xff) | ((c[1] & 0xff) << 8));
 813 }
 814
 815 int iso_722 (c)
 816 char *c;
 817 {
 818   return (((c[0] & 0xff) << 8) | (c[1] & 0xff));
 819 }
 820
 821 int iso_723 (c)
 822 char *c;
 823 {
 824   if (c[0] != c[3] || c[1] != c[2])
 825   {
 826     fprintf (STDERR, "Invalid ISO 7.2.3 number\n");
 827     exit (1);
 828   }
 829   return (iso_721 (c));
 830 }
 831
 832 long iso_731 (c)
 833 char *c;
 834 {
 835   return ((long)(c[0] & 0xff)
 836        | ((long)(c[1] & 0xff) << 8)
 837        | ((long)(c[2] & 0xff) << 16)
 838        | ((long)(c[3] & 0xff) << 24));
 839 }
 840
 841
 842 long iso_732 (c)
 843 char *c;
 844 {
 845   return (((long)(c[0] & 0xff) << 24)
 846         | (((long)c[1] & 0xff) << 16)
 847         | (((long)c[2] & 0xff) << 8)
 848         | ((long)c[3] & 0xff));
 849 }
 850
 851 long iso_733 (c)
 852 char *c;
 853 {
 854 int i;
 855
 856   for (i = 0; i < 4; i++)
 857   {
 858     if (c[i] != c[7-i])
 859     {
 860       fprintf (STDERR, "Invalid ISO 7.3.3 number\n");
 861       exit (1);
 862     }
 863   }
 864   return (iso_731(c));
 865 }