fs/iso9660.c

   1 /* iso9660.c - iso9660 implementation with extensions:
   2    SUSP, Rock Ridge.  */
   3 /*
   4  *  GRUB  --  GRand Unified Bootloader
   5  *  Copyright (C) 2004,2005,2006,2007,2008  Free Software Foundation, Inc.
   6  *
   7  *  GRUB is free software: you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation, either version 3 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  GRUB is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <grub/err.h>
  22 #include <grub/file.h>
  23 #include <grub/mm.h>
  24 #include <grub/misc.h>
  25 #include <grub/disk.h>
  26 #include <grub/dl.h>
  27 #include <grub/types.h>
  28 #include <grub/fshelp.h>
  29
  30 #define GRUB_ISO9660_FSTYPE_DIR         0040000
  31 #define GRUB_ISO9660_FSTYPE_REG         0100000
  32 #define GRUB_ISO9660_FSTYPE_SYMLINK     0120000
  33 #define GRUB_ISO9660_FSTYPE_MASK        0170000
  34
  35 #define GRUB_ISO9660_LOG2_BLKSZ         2
  36 #define GRUB_ISO9660_BLKSZ              2048
  37
  38 #define GRUB_ISO9660_RR_DOT             2
  39 #define GRUB_ISO9660_RR_DOTDOT          4
  40
  41 #define GRUB_ISO9660_VOLDESC_BOOT       0
  42 #define GRUB_ISO9660_VOLDESC_PRIMARY    1
  43 #define GRUB_ISO9660_VOLDESC_SUPP       2
  44 #define GRUB_ISO9660_VOLDESC_PART       3
  45 #define GRUB_ISO9660_VOLDESC_END        255
  46
  47 /* The head of a volume descriptor.  */
  48 struct grub_iso9660_voldesc
  49 {
  50   grub_uint8_t type;
  51   grub_uint8_t magic[5];
  52   grub_uint8_t version;
  53 } __attribute__ ((packed));
  54
  55 /* A directory entry.  */
  56 struct grub_iso9660_dir
  57 {
  58   grub_uint8_t len;
  59   grub_uint8_t ext_sectors;
  60   grub_uint32_t first_sector;
  61   grub_uint32_t first_sector_be;
  62   grub_uint32_t size;
  63   grub_uint32_t size_be;
  64   grub_uint8_t unused1[7];
  65   grub_uint8_t flags;
  66   grub_uint8_t unused2[6];
  67   grub_uint8_t namelen;
  68 } __attribute__ ((packed));
  69
  70 struct grub_iso9660_date
  71 {
  72   grub_uint8_t year[4];
  73   grub_uint8_t month[2];
  74   grub_uint8_t day[2];
  75   grub_uint8_t hour[2];
  76   grub_uint8_t minute[2];
  77   grub_uint8_t second[2];
  78   grub_uint8_t hundredth[2];
  79   grub_uint8_t offset;
  80 } __attribute__ ((packed));
  81
  82 /* The primary volume descriptor.  Only little endian is used.  */
  83 struct grub_iso9660_primary_voldesc
  84 {
  85   struct grub_iso9660_voldesc voldesc;
  86   grub_uint8_t unused1[33];
  87   grub_uint8_t volname[32];
  88   grub_uint8_t unused2[16];
  89   grub_uint8_t escape[32];
  90   grub_uint8_t unused3[12];
  91   grub_uint32_t path_table_size;
  92   grub_uint8_t unused4[4];
  93   grub_uint32_t path_table;
  94   grub_uint8_t unused5[12];
  95   struct grub_iso9660_dir rootdir;
  96   grub_uint8_t unused6[624];
  97   struct grub_iso9660_date created;
  98   struct grub_iso9660_date modified;
  99 } __attribute__ ((packed));
 100
 101 /* A single entry in the path table.  */
 102 struct grub_iso9660_path
 103 {
 104   grub_uint8_t len;
 105   grub_uint8_t sectors;
 106   grub_uint32_t first_sector;
 107   grub_uint16_t parentdir;
 108   grub_uint8_t name[0];
 109 } __attribute__ ((packed));
 110
 111 /* An entry in the System Usage area of the directory entry.  */
 112 struct grub_iso9660_susp_entry
 113 {
 114   grub_uint8_t sig[2];
 115   grub_uint8_t len;
 116   grub_uint8_t version;
 117   grub_uint8_t data[0];
 118 } __attribute__ ((packed));
 119
 120 /* The CE entry.  This is used to describe the next block where data
 121    can be found.  */
 122 struct grub_iso9660_susp_ce
 123 {
 124   struct grub_iso9660_susp_entry entry;
 125   grub_uint32_t blk;
 126   grub_uint32_t blk_be;
 127   grub_uint32_t off;
 128   grub_uint32_t off_be;
 129   grub_uint32_t len;
 130   grub_uint32_t len_be;
 131 } __attribute__ ((packed));
 132
 133 struct grub_iso9660_data
 134 {
 135   struct grub_iso9660_primary_voldesc voldesc;
 136   grub_disk_t disk;
 137   unsigned int first_sector;
 138   unsigned int length;
 139   int rockridge;
 140   int susp_skip;
 141   int joliet;
 142 };
 143
 144 struct grub_fshelp_node
 145 {
 146   struct grub_iso9660_data *data;
 147   unsigned int size;
 148   unsigned int blk;
 149   unsigned int dir_blk;
 150   unsigned int dir_off;
 151 };
 152
 153 static grub_dl_t my_mod;
 154 \f
 155
 156 /* Iterate over the susp entries, starting with block SUA_BLOCK on the
 157    offset SUA_POS with a size of SUA_SIZE bytes.  Hook is called for
 158    every entry.  */
 159 static grub_err_t
 160 grub_iso9660_susp_iterate (struct grub_iso9660_data *data,
 161                            int sua_block, int sua_pos, int sua_size,
 162                            grub_err_t (*hook)
 163                            (struct grub_iso9660_susp_entry *entry))
 164 {
 165   char *sua;
 166   struct grub_iso9660_susp_entry *entry;
 167
 168   auto grub_err_t load_sua (void);
 169
 170   /* Load a part of the System Usage Area.  */
 171   grub_err_t load_sua (void)
 172     {
 173       sua = grub_malloc (sua_size);
 174       if (!sua)
 175         return grub_errno;
 176
 177       if (grub_disk_read (data->disk, sua_block, sua_pos,
 178                           sua_size, sua))
 179         return grub_errno;
 180
 181       entry = (struct grub_iso9660_susp_entry *) sua;
 182       return 0;
 183     }
 184
 185   if (load_sua ())
 186     return grub_errno;
 187
 188   for (; (char *) entry < (char *) sua + sua_size - 1;
 189        entry = (struct grub_iso9660_susp_entry *)
 190          ((char *) entry + entry->len))
 191     {
 192       /* The last entry.  */
 193       if (grub_strncmp ((char *) entry->sig, "ST", 2) == 0)
 194         break;
 195
 196       /* Additional entries are stored elsewhere.  */
 197       if (grub_strncmp ((char *) entry->sig, "CE", 2) == 0)
 198         {
 199           struct grub_iso9660_susp_ce *ce;
 200
 201           ce = (struct grub_iso9660_susp_ce *) entry;
 202           sua_size = grub_le_to_cpu32 (ce->len);
 203           sua_pos = grub_le_to_cpu32 (ce->off);
 204           sua_block = grub_le_to_cpu32 (ce->blk) << GRUB_ISO9660_LOG2_BLKSZ;
 205
 206           grub_free (sua);
 207           if (load_sua ())
 208             return grub_errno;
 209         }
 210
 211       if (hook (entry))
 212         {
 213           grub_free (sua);
 214           return 0;
 215         }
 216     }
 217
 218   grub_free (sua);
 219   return 0;
 220 }
 221
 222 static char *
 223 grub_iso9660_convert_string (grub_uint16_t *us, int len)
 224 {
 225   char *p;
 226   int i;
 227
 228   p = grub_malloc (len * 4 + 1);
 229   if (! p)
 230     return p;
 231
 232   for (i=0; i<len; i++)
 233     us[i] = grub_be_to_cpu16 (us[i]);
 234
 235   *grub_utf16_to_utf8 ((grub_uint8_t *) p, us, len) = '\0';
 236
 237   return p;
 238 }
 239
 240 static struct grub_iso9660_data *
 241 grub_iso9660_mount (grub_disk_t disk)
 242 {
 243   struct grub_iso9660_data *data = 0;
 244   struct grub_iso9660_dir rootdir;
 245   int sua_pos;
 246   int sua_size;
 247   char *sua;
 248   struct grub_iso9660_susp_entry *entry;
 249   struct grub_iso9660_primary_voldesc voldesc;
 250   int block;
 251
 252   auto grub_err_t susp_iterate (struct grub_iso9660_susp_entry *);
 253
 254   grub_err_t susp_iterate (struct grub_iso9660_susp_entry *susp_entry)
 255     {
 256       /* The "ER" entry is used to detect extensions.  The
 257          `IEEE_P1285' extension means Rock ridge.  */
 258       if (grub_strncmp ((char *) susp_entry->sig, "ER", 2) == 0)
 259         {
 260           data->rockridge = 1;
 261           return 1;
 262         }
 263       return 0;
 264     }
 265
 266   data = grub_malloc (sizeof (struct grub_iso9660_data));
 267   if (! data)
 268     return 0;
 269
 270   data->disk = disk;
 271   data->rockridge = 0;
 272   data->joliet = 0;
 273
 274   block = 16;
 275   do
 276     {
 277       int copy_voldesc = 0;
 278
 279       /* Read the superblock.  */
 280       if (grub_disk_read (disk, block << GRUB_ISO9660_LOG2_BLKSZ, 0,
 281                           sizeof (struct grub_iso9660_primary_voldesc),
 282                           (char *) &voldesc))
 283         {
 284           grub_error (GRUB_ERR_BAD_FS, "not a iso9660 filesystem");
 285           goto fail;
 286         }
 287
 288       if (grub_strncmp ((char *) voldesc.voldesc.magic, "CD001", 5) != 0)
 289         {
 290           grub_error (GRUB_ERR_BAD_FS, "not a iso9660 filesystem");
 291           goto fail;
 292         }
 293
 294       if (voldesc.voldesc.type == GRUB_ISO9660_VOLDESC_PRIMARY)
 295         copy_voldesc = 1;
 296       else if ((voldesc.voldesc.type == GRUB_ISO9660_VOLDESC_SUPP) &&
 297                (voldesc.escape[0] == 0x25) && (voldesc.escape[1] == 0x2f) &&
 298                ((voldesc.escape[2] == 0x40) ||  /* UCS-2 Level 1.  */
 299                 (voldesc.escape[2] == 0x43) ||  /* UCS-2 Level 2.  */
 300                 (voldesc.escape[2] == 0x45)))   /* UCS-2 Level 3.  */
 301         {
 302           copy_voldesc = 1;
 303           data->joliet = 1;
 304         }
 305
 306       if (copy_voldesc)
 307         grub_memcpy((char *) &data->voldesc, (char *) &voldesc,
 308                     sizeof (struct grub_iso9660_primary_voldesc));
 309
 310       block++;
 311     } while (voldesc.voldesc.type != GRUB_ISO9660_VOLDESC_END);
 312
 313   /* Read the system use area and test it to see if SUSP is
 314      supported.  */
 315   if (grub_disk_read (disk, (grub_le_to_cpu32 (data->voldesc.rootdir.first_sector)
 316                              << GRUB_ISO9660_LOG2_BLKSZ), 0,
 317                       sizeof (rootdir), (char *) &rootdir))
 318     {
 319       grub_error (GRUB_ERR_BAD_FS, "not a iso9660 filesystem");
 320       goto fail;
 321     }
 322
 323   sua_pos = (sizeof (rootdir) + rootdir.namelen
 324              + (rootdir.namelen % 2) - 1);
 325   sua_size = rootdir.len - sua_pos;
 326
 327   sua = grub_malloc (sua_size);
 328   if (! sua)
 329     goto fail;
 330
 331   if (grub_disk_read (disk, (grub_le_to_cpu32 (data->voldesc.rootdir.first_sector)
 332                              << GRUB_ISO9660_LOG2_BLKSZ), sua_pos,
 333                       sua_size, sua))
 334     {
 335       grub_error (GRUB_ERR_BAD_FS, "not a iso9660 filesystem");
 336       goto fail;
 337     }
 338
 339   entry = (struct grub_iso9660_susp_entry *) sua;
 340
 341   /* Test if the SUSP protocol is used on this filesystem.  */
 342   if (grub_strncmp ((char *) entry->sig, "SP", 2) == 0)
 343     {
 344       /* The 2nd data byte stored how many bytes are skipped every time
 345          to get to the SUA (System Usage Area).  */
 346       data->susp_skip = entry->data[2];
 347       entry = (struct grub_iso9660_susp_entry *) ((char *) entry + entry->len);
 348
 349       /* Iterate over the entries in the SUA area to detect
 350          extensions.  */
 351       if (grub_iso9660_susp_iterate (data,
 352                                      (grub_le_to_cpu32 (data->voldesc.rootdir.first_sector)
 353                                       << GRUB_ISO9660_LOG2_BLKSZ),
 354                                      sua_pos, sua_size, susp_iterate))
 355         goto fail;
 356     }
 357
 358   return data;
 359
 360  fail:
 361   grub_free (data);
 362   return 0;
 363 }
 364
 365
 366 static char *
 367 grub_iso9660_read_symlink (grub_fshelp_node_t node)
 368 {
 369   struct grub_iso9660_dir dirent;
 370   int sua_off;
 371   int sua_size;
 372   char *symlink = 0;
 373   int addslash = 0;
 374
 375   auto void add_part (const char *part, int len);
 376   auto grub_err_t susp_iterate_sl (struct grub_iso9660_susp_entry *);
 377
 378   /* Extend the symlink.  */
 379   void add_part (const char *part, int len)
 380     {
 381       int size = grub_strlen (symlink);
 382
 383       symlink = grub_realloc (symlink, size + len + 1);
 384       if (! symlink)
 385         return;
 386
 387       grub_strncat (symlink, part, len);
 388     }
 389
 390   /* Read in a symlink.  */
 391   grub_err_t susp_iterate_sl (struct grub_iso9660_susp_entry *entry)
 392     {
 393       if (grub_strncmp ("SL", (char *) entry->sig, 2) == 0)
 394         {
 395           unsigned int pos = 1;
 396
 397           /* The symlink is not stored as a POSIX symlink, translate it.  */
 398           while (pos < grub_le_to_cpu32 (entry->len))
 399             {
 400               if (addslash)
 401                 {
 402                   add_part ("/", 1);
 403                   addslash = 0;
 404                 }
 405
 406               /* The current position is the `Component Flag'.  */
 407               switch (entry->data[pos] & 30)
 408                 {
 409                 case 0:
 410                   {
 411                     /* The data on pos + 2 is the actual data, pos + 1
 412                        is the length.  Both are part of the `Component
 413                        Record'.  */
 414                     add_part ((char *) &entry->data[pos + 2],
 415                               entry->data[pos + 1]);
 416                     if ((entry->data[pos] & 1))
 417                       addslash = 1;
 418
 419                     break;
 420                   }
 421
 422                 case 2:
 423                   add_part ("./", 2);
 424                   break;
 425
 426                 case 4:
 427                   add_part ("../", 3);
 428                   break;
 429
 430                 case 8:
 431                   add_part ("/", 1);
 432                   break;
 433                 }
 434               /* In pos + 1 the length of the `Component Record' is
 435                  stored.  */
 436               pos += entry->data[pos + 1] + 2;
 437             }
 438
 439           /* Check if `grub_realloc' failed.  */
 440           if (grub_errno)
 441             return grub_errno;
 442         }
 443
 444       return 0;
 445     }
 446
 447   if (grub_disk_read (node->data->disk, node->dir_blk, node->dir_off,
 448                       sizeof (dirent), (char *) &dirent))
 449     return 0;
 450
 451   sua_off = (sizeof (dirent) + dirent.namelen + 1 - (dirent.namelen % 2)
 452              + node->data->susp_skip);
 453   sua_size = dirent.len - sua_off;
 454
 455   symlink = grub_malloc (1);
 456   if (!symlink)
 457     return 0;
 458
 459   *symlink = '\0';
 460
 461   if (grub_iso9660_susp_iterate (node->data, node->dir_blk,
 462                                  node->dir_off + sua_off,
 463                                  sua_size, susp_iterate_sl))
 464     {
 465       grub_free (symlink);
 466       return 0;
 467     }
 468
 469   return symlink;
 470 }
 471
 472
 473 static int
 474 grub_iso9660_iterate_dir (grub_fshelp_node_t dir,
 475                           int NESTED_FUNC_ATTR
 476                           (*hook) (const char *filename,
 477                                    enum grub_fshelp_filetype filetype,
 478                                    grub_fshelp_node_t node))
 479 {
 480   struct grub_iso9660_dir dirent;
 481   unsigned int offset = 0;
 482   char *filename;
 483   int filename_alloc = 0;
 484   enum grub_fshelp_filetype type;
 485
 486   auto grub_err_t susp_iterate_dir (struct grub_iso9660_susp_entry *);
 487
 488   grub_err_t susp_iterate_dir (struct grub_iso9660_susp_entry *entry)
 489     {
 490       /* The filename in the rock ridge entry.  */
 491       if (grub_strncmp ("NM", (char *) entry->sig, 2) == 0)
 492         {
 493           /* The flags are stored at the data position 0, here the
 494              filename type is stored.  */
 495           if (entry->data[0] & GRUB_ISO9660_RR_DOT)
 496             filename = ".";
 497           else if (entry->data[0] & GRUB_ISO9660_RR_DOTDOT)
 498             filename = "..";
 499           else
 500             {
 501               int size = 1;
 502               if (filename)
 503                 {
 504                   size += grub_strlen (filename);
 505                   grub_realloc (filename,
 506                                 grub_strlen (filename)
 507                                 + entry->len);
 508                 }
 509               else
 510                 {
 511                   size = entry->len - 5;
 512                   filename = grub_malloc (size + 1);
 513                   filename[0] = '\0';
 514                 }
 515               filename_alloc = 1;
 516               grub_strncpy (filename, (char *) &entry->data[1], size);
 517               filename[size] = '\0';
 518             }
 519         }
 520       /* The mode information (st_mode).  */
 521       else if (grub_strncmp ((char *) entry->sig, "PX", 2) == 0)
 522         {
 523           /* At position 0 of the PX record the st_mode information is
 524              stored.  */
 525           grub_uint32_t mode = ((*(grub_uint32_t *) &entry->data[0])
 526                                 & GRUB_ISO9660_FSTYPE_MASK);
 527
 528           switch (mode)
 529             {
 530             case GRUB_ISO9660_FSTYPE_DIR:
 531               type = GRUB_FSHELP_DIR;
 532               break;
 533             case GRUB_ISO9660_FSTYPE_REG:
 534               type = GRUB_FSHELP_REG;
 535               break;
 536             case GRUB_ISO9660_FSTYPE_SYMLINK:
 537               type = GRUB_FSHELP_SYMLINK;
 538               break;
 539             default:
 540               type = GRUB_FSHELP_UNKNOWN;
 541             }
 542         }
 543
 544       return 0;
 545     }
 546
 547   while (offset < dir->size)
 548     {
 549       if (grub_disk_read (dir->data->disk,
 550                           (dir->blk << GRUB_ISO9660_LOG2_BLKSZ)
 551                           + offset / GRUB_DISK_SECTOR_SIZE,
 552                           offset % GRUB_DISK_SECTOR_SIZE,
 553                           sizeof (dirent), (char *) &dirent))
 554         return 0;
 555
 556       /* The end of the block, skip to the next one.  */
 557       if (!dirent.len)
 558         {
 559           offset = (offset / GRUB_ISO9660_BLKSZ + 1) * GRUB_ISO9660_BLKSZ;
 560           continue;
 561         }
 562
 563       {
 564         char name[dirent.namelen + 1];
 565         int nameoffset = offset + sizeof (dirent);
 566         struct grub_fshelp_node *node;
 567         int sua_off = (sizeof (dirent) + dirent.namelen + 1
 568                        - (dirent.namelen % 2));;
 569         int sua_size = dirent.len - sua_off;
 570
 571         sua_off += offset + dir->data->susp_skip;
 572
 573         filename = 0;
 574         filename_alloc = 0;
 575         type = GRUB_FSHELP_UNKNOWN;
 576
 577         if (dir->data->rockridge
 578             && grub_iso9660_susp_iterate (dir->data,
 579                                           (dir->blk << GRUB_ISO9660_LOG2_BLKSZ)
 580                                           + (sua_off
 581                                              / GRUB_DISK_SECTOR_SIZE),
 582                                           sua_off % GRUB_DISK_SECTOR_SIZE,
 583                                           sua_size, susp_iterate_dir))
 584           return 0;
 585
 586         /* Read the name.  */
 587         if (grub_disk_read (dir->data->disk,
 588                             (dir->blk << GRUB_ISO9660_LOG2_BLKSZ)
 589                             + nameoffset / GRUB_DISK_SECTOR_SIZE,
 590                             nameoffset % GRUB_DISK_SECTOR_SIZE,
 591                             dirent.namelen, (char *) name))
 592           return 0;
 593
 594         node = grub_malloc (sizeof (struct grub_fshelp_node));
 595         if (!node)
 596           return 0;
 597
 598         /* Setup a new node.  */
 599         node->data = dir->data;
 600         node->size = grub_le_to_cpu32 (dirent.size);
 601         node->blk = grub_le_to_cpu32 (dirent.first_sector);
 602         node->dir_blk = ((dir->blk << GRUB_ISO9660_LOG2_BLKSZ)
 603                          + offset / GRUB_DISK_SECTOR_SIZE);
 604         node->dir_off = offset % GRUB_DISK_SECTOR_SIZE;
 605
 606         /* If the filetype was not stored using rockridge, use
 607            whatever is stored in the iso9660 filesystem.  */
 608         if (type == GRUB_FSHELP_UNKNOWN)
 609           {
 610             if ((dirent.flags & 3) == 2)
 611               type = GRUB_FSHELP_DIR;
 612             else
 613               type = GRUB_FSHELP_REG;
 614           }
 615
 616         /* The filename was not stored in a rock ridge entry.  Read it
 617            from the iso9660 filesystem.  */
 618         if (!filename)
 619           {
 620             name[dirent.namelen] = '\0';
 621             filename = grub_strrchr (name, ';');
 622             if (filename)
 623               *filename = '\0';
 624
 625             if (dirent.namelen == 1 && name[0] == 0)
 626               filename = ".";
 627             else if (dirent.namelen == 1 && name[0] == 1)
 628               filename = "..";
 629             else
 630               filename = name;
 631           }
 632
 633         if (dir->data->joliet)
 634           {
 635             char *oldname;
 636
 637             oldname = filename;
 638             filename = grub_iso9660_convert_string
 639                   ((grub_uint16_t *) oldname, dirent.namelen >> 1);
 640
 641             if (filename_alloc)
 642               grub_free (oldname);
 643
 644             filename_alloc = 1;
 645           }
 646
 647         if (hook (filename, type, node))
 648           {
 649             if (filename_alloc)
 650               grub_free (filename);
 651             return 1;
 652           }
 653         if (filename_alloc)
 654           grub_free (filename);
 655       }
 656
 657       offset += dirent.len;
 658     }
 659
 660   return 0;
 661 }
 662
 663
 664 \f
 665 static grub_err_t
 666 grub_iso9660_dir (grub_device_t device, const char *path,
 667                   int (*hook) (const char *filename,
 668                                const struct grub_dirhook_info *info))
 669 {
 670   struct grub_iso9660_data *data = 0;
 671   struct grub_fshelp_node rootnode;
 672   struct grub_fshelp_node *foundnode;
 673
 674   auto int NESTED_FUNC_ATTR iterate (const char *filename,
 675                                      enum grub_fshelp_filetype filetype,
 676                                      grub_fshelp_node_t node);
 677
 678   int NESTED_FUNC_ATTR iterate (const char *filename,
 679                                 enum grub_fshelp_filetype filetype,
 680                                 grub_fshelp_node_t node)
 681     {
 682       struct grub_dirhook_info info;
 683       grub_memset (&info, 0, sizeof (info));
 684       info.dir = ((filetype & GRUB_FSHELP_TYPE_MASK) == GRUB_FSHELP_DIR);
 685       grub_free (node);
 686       return hook (filename, &info);
 687     }
 688
 689   grub_dl_ref (my_mod);
 690
 691   data = grub_iso9660_mount (device->disk);
 692   if (! data)
 693     goto fail;
 694
 695   rootnode.data = data;
 696   rootnode.blk = grub_le_to_cpu32 (data->voldesc.rootdir.first_sector);
 697   rootnode.size = grub_le_to_cpu32 (data->voldesc.rootdir.size);
 698
 699   /* Use the fshelp function to traverse the path.  */
 700   if (grub_fshelp_find_file (path, &rootnode,
 701                              &foundnode,
 702                              grub_iso9660_iterate_dir,
 703                              grub_iso9660_read_symlink,
 704                              GRUB_FSHELP_DIR))
 705     goto fail;
 706
 707   /* List the files in the directory.  */
 708   grub_iso9660_iterate_dir (foundnode, iterate);
 709
 710   if (foundnode != &rootnode)
 711     grub_free (foundnode);
 712
 713  fail:
 714   grub_free (data);
 715
 716   grub_dl_unref (my_mod);
 717
 718   return grub_errno;
 719 }
 720
 721
 722 /* Open a file named NAME and initialize FILE.  */
 723 static grub_err_t
 724 grub_iso9660_open (struct grub_file *file, const char *name)
 725 {
 726   struct grub_iso9660_data *data;
 727   struct grub_fshelp_node rootnode;
 728   struct grub_fshelp_node *foundnode;
 729
 730   grub_dl_ref (my_mod);
 731
 732   data = grub_iso9660_mount (file->device->disk);
 733   if (!data)
 734     goto fail;
 735
 736   rootnode.data = data;
 737   rootnode.blk = grub_le_to_cpu32 (data->voldesc.rootdir.first_sector);
 738   rootnode.size = grub_le_to_cpu32 (data->voldesc.rootdir.size);
 739
 740   /* Use the fshelp function to traverse the path.  */
 741   if (grub_fshelp_find_file (name, &rootnode,
 742                              &foundnode,
 743                              grub_iso9660_iterate_dir,
 744                              grub_iso9660_read_symlink,
 745                              GRUB_FSHELP_REG))
 746     goto fail;
 747
 748   data->first_sector = foundnode->blk;
 749   data->length = foundnode->size;
 750
 751   file->data = data;
 752   file->size = foundnode->size;
 753   file->offset = 0;
 754
 755   return 0;
 756
 757  fail:
 758   grub_dl_unref (my_mod);
 759
 760   grub_free (data);
 761
 762   return grub_errno;;
 763 }
 764
 765
 766 static grub_ssize_t
 767 grub_iso9660_read (grub_file_t file, char *buf, grub_size_t len)
 768 {
 769   struct grub_iso9660_data *data =
 770     (struct grub_iso9660_data *) file->data;
 771
 772   /* XXX: The file is stored in as a single extent.  */
 773   data->disk->read_hook = file->read_hook;
 774   grub_disk_read (data->disk,
 775                   data->first_sector << GRUB_ISO9660_LOG2_BLKSZ,
 776                   file->offset,
 777                   len, buf);
 778   data->disk->read_hook = 0;
 779
 780   return len;
 781 }
 782
 783
 784 static grub_err_t
 785 grub_iso9660_close (grub_file_t file)
 786 {
 787   grub_free (file->data);
 788
 789   grub_dl_unref (my_mod);
 790
 791   return GRUB_ERR_NONE;
 792 }
 793
 794
 795 static grub_err_t
 796 grub_iso9660_label (grub_device_t device, char **label)
 797 {
 798   struct grub_iso9660_data *data;
 799   data = grub_iso9660_mount (device->disk);
 800
 801   if (data)
 802     {
 803       if (data->joliet)
 804         *label = grub_iso9660_convert_string
 805                  ((grub_uint16_t *) &data->voldesc.volname, 16);
 806       else
 807         *label = grub_strndup ((char *) data->voldesc.volname, 32);
 808       grub_free (data);
 809     }
 810   else
 811     *label = 0;
 812
 813   return grub_errno;
 814 }
 815
 816
 817 static grub_err_t
 818 grub_iso9660_uuid (grub_device_t device, char **uuid)
 819 {
 820   struct grub_iso9660_data *data;
 821   grub_disk_t disk = device->disk;
 822
 823   grub_dl_ref (my_mod);
 824
 825   data = grub_iso9660_mount (disk);
 826   if (data)
 827     {
 828       if (! data->voldesc.modified.year[0] && ! data->voldesc.modified.year[1]
 829           && ! data->voldesc.modified.year[2] && ! data->voldesc.modified.year[3]
 830           && ! data->voldesc.modified.month[0] && ! data->voldesc.modified.month[1]
 831           && ! data->voldesc.modified.day[0] && ! data->voldesc.modified.day[1]
 832           && ! data->voldesc.modified.hour[0] && ! data->voldesc.modified.hour[1]
 833           && ! data->voldesc.modified.minute[0] && ! data->voldesc.modified.minute[1]
 834           && ! data->voldesc.modified.second[0] && ! data->voldesc.modified.second[1]
 835           && ! data->voldesc.modified.hundredth[0] && ! data->voldesc.modified.hundredth[1])
 836         {
 837           grub_error (GRUB_ERR_BAD_NUMBER, "No creation date in filesystem to generate UUID.");
 838           *uuid = NULL;
 839         }
 840       else
 841         {
 842           *uuid = grub_malloc (sizeof ("YYYY-MM-DD-HH-mm-ss-hh"));
 843           grub_sprintf (*uuid, "%c%c%c%c-%c%c-%c%c-%c%c-%c%c-%c%c-%c%c",
 844                         data->voldesc.modified.year[0], data->voldesc.modified.year[1],
 845                         data->voldesc.modified.year[2], data->voldesc.modified.year[3],
 846                         data->voldesc.modified.month[0], data->voldesc.modified.month[1],
 847                         data->voldesc.modified.day[0], data->voldesc.modified.day[1],
 848                         data->voldesc.modified.hour[0], data->voldesc.modified.hour[1],
 849                         data->voldesc.modified.minute[0], data->voldesc.modified.minute[1],
 850                         data->voldesc.modified.second[0], data->voldesc.modified.second[1],
 851                         data->voldesc.modified.hundredth[0], data->voldesc.modified.hundredth[1]);
 852         }
 853     }
 854   else
 855     *uuid = NULL;
 856
 857         grub_dl_unref (my_mod);
 858
 859   grub_free (data);
 860
 861   return grub_errno;
 862 }
 863
 864 \f
 865
 866 static struct grub_fs grub_iso9660_fs =
 867   {
 868     .name = "iso9660",
 869     .dir = grub_iso9660_dir,
 870     .open = grub_iso9660_open,
 871     .read = grub_iso9660_read,
 872     .close = grub_iso9660_close,
 873     .label = grub_iso9660_label,
 874     .uuid = grub_iso9660_uuid,
 875     .next = 0
 876   };
 877
 878 GRUB_MOD_INIT(iso9660)
 879 {
 880   grub_fs_register (&grub_iso9660_fs);
 881   my_mod = mod;
 882 }
 883
 884 GRUB_MOD_FINI(iso9660)
 885 {
 886   grub_fs_unregister (&grub_iso9660_fs);
 887 }