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_zalloc (sizeof (struct grub_iso9660_data));
 267   if (! data)
 268     return 0;
 269
 270   data->disk = disk;
 271
 272   block = 16;
 273   do
 274     {
 275       int copy_voldesc = 0;
 276
 277       /* Read the superblock.  */
 278       if (grub_disk_read (disk, block << GRUB_ISO9660_LOG2_BLKSZ, 0,
 279                           sizeof (struct grub_iso9660_primary_voldesc),
 280                           (char *) &voldesc))
 281         {
 282           grub_error (GRUB_ERR_BAD_FS, "not a iso9660 filesystem");
 283           goto fail;
 284         }
 285
 286       if (grub_strncmp ((char *) voldesc.voldesc.magic, "CD001", 5) != 0)
 287         {
 288           grub_error (GRUB_ERR_BAD_FS, "not a iso9660 filesystem");
 289           goto fail;
 290         }
 291
 292       if (voldesc.voldesc.type == GRUB_ISO9660_VOLDESC_PRIMARY)
 293         copy_voldesc = 1;
 294       else if ((voldesc.voldesc.type == GRUB_ISO9660_VOLDESC_SUPP) &&
 295                (voldesc.escape[0] == 0x25) && (voldesc.escape[1] == 0x2f) &&
 296                ((voldesc.escape[2] == 0x40) ||  /* UCS-2 Level 1.  */
 297                 (voldesc.escape[2] == 0x43) ||  /* UCS-2 Level 2.  */
 298                 (voldesc.escape[2] == 0x45)))   /* UCS-2 Level 3.  */
 299         {
 300           copy_voldesc = 1;
 301           data->joliet = 1;
 302         }
 303
 304       if (copy_voldesc)
 305         grub_memcpy((char *) &data->voldesc, (char *) &voldesc,
 306                     sizeof (struct grub_iso9660_primary_voldesc));
 307
 308       block++;
 309     } while (voldesc.voldesc.type != GRUB_ISO9660_VOLDESC_END);
 310
 311   /* Read the system use area and test it to see if SUSP is
 312      supported.  */
 313   if (grub_disk_read (disk, (grub_le_to_cpu32 (data->voldesc.rootdir.first_sector)
 314                              << GRUB_ISO9660_LOG2_BLKSZ), 0,
 315                       sizeof (rootdir), (char *) &rootdir))
 316     {
 317       grub_error (GRUB_ERR_BAD_FS, "not a iso9660 filesystem");
 318       goto fail;
 319     }
 320
 321   sua_pos = (sizeof (rootdir) + rootdir.namelen
 322              + (rootdir.namelen % 2) - 1);
 323   sua_size = rootdir.len - sua_pos;
 324
 325   sua = grub_malloc (sua_size);
 326   if (! sua)
 327     goto fail;
 328
 329   if (grub_disk_read (disk, (grub_le_to_cpu32 (data->voldesc.rootdir.first_sector)
 330                              << GRUB_ISO9660_LOG2_BLKSZ), sua_pos,
 331                       sua_size, sua))
 332     {
 333       grub_error (GRUB_ERR_BAD_FS, "not a iso9660 filesystem");
 334       goto fail;
 335     }
 336
 337   entry = (struct grub_iso9660_susp_entry *) sua;
 338
 339   /* Test if the SUSP protocol is used on this filesystem.  */
 340   if (grub_strncmp ((char *) entry->sig, "SP", 2) == 0)
 341     {
 342       /* The 2nd data byte stored how many bytes are skipped every time
 343          to get to the SUA (System Usage Area).  */
 344       data->susp_skip = entry->data[2];
 345       entry = (struct grub_iso9660_susp_entry *) ((char *) entry + entry->len);
 346
 347       /* Iterate over the entries in the SUA area to detect
 348          extensions.  */
 349       if (grub_iso9660_susp_iterate (data,
 350                                      (grub_le_to_cpu32 (data->voldesc.rootdir.first_sector)
 351                                       << GRUB_ISO9660_LOG2_BLKSZ),
 352                                      sua_pos, sua_size, susp_iterate))
 353         goto fail;
 354     }
 355
 356   return data;
 357
 358  fail:
 359   grub_free (data);
 360   return 0;
 361 }
 362
 363
 364 static char *
 365 grub_iso9660_read_symlink (grub_fshelp_node_t node)
 366 {
 367   struct grub_iso9660_dir dirent;
 368   int sua_off;
 369   int sua_size;
 370   char *symlink = 0;
 371   int addslash = 0;
 372
 373   auto void add_part (const char *part, int len);
 374   auto grub_err_t susp_iterate_sl (struct grub_iso9660_susp_entry *);
 375
 376   /* Extend the symlink.  */
 377   void add_part (const char *part, int len)
 378     {
 379       int size = grub_strlen (symlink);
 380
 381       symlink = grub_realloc (symlink, size + len + 1);
 382       if (! symlink)
 383         return;
 384
 385       grub_strncat (symlink, part, len);
 386     }
 387
 388   /* Read in a symlink.  */
 389   grub_err_t susp_iterate_sl (struct grub_iso9660_susp_entry *entry)
 390     {
 391       if (grub_strncmp ("SL", (char *) entry->sig, 2) == 0)
 392         {
 393           unsigned int pos = 1;
 394
 395           /* The symlink is not stored as a POSIX symlink, translate it.  */
 396           while (pos < grub_le_to_cpu32 (entry->len))
 397             {
 398               if (addslash)
 399                 {
 400                   add_part ("/", 1);
 401                   addslash = 0;
 402                 }
 403
 404               /* The current position is the `Component Flag'.  */
 405               switch (entry->data[pos] & 30)
 406                 {
 407                 case 0:
 408                   {
 409                     /* The data on pos + 2 is the actual data, pos + 1
 410                        is the length.  Both are part of the `Component
 411                        Record'.  */
 412                     add_part ((char *) &entry->data[pos + 2],
 413                               entry->data[pos + 1]);
 414                     if ((entry->data[pos] & 1))
 415                       addslash = 1;
 416
 417                     break;
 418                   }
 419
 420                 case 2:
 421                   add_part ("./", 2);
 422                   break;
 423
 424                 case 4:
 425                   add_part ("../", 3);
 426                   break;
 427
 428                 case 8:
 429                   add_part ("/", 1);
 430                   break;
 431                 }
 432               /* In pos + 1 the length of the `Component Record' is
 433                  stored.  */
 434               pos += entry->data[pos + 1] + 2;
 435             }
 436
 437           /* Check if `grub_realloc' failed.  */
 438           if (grub_errno)
 439             return grub_errno;
 440         }
 441
 442       return 0;
 443     }
 444
 445   if (grub_disk_read (node->data->disk, node->dir_blk, node->dir_off,
 446                       sizeof (dirent), (char *) &dirent))
 447     return 0;
 448
 449   sua_off = (sizeof (dirent) + dirent.namelen + 1 - (dirent.namelen % 2)
 450              + node->data->susp_skip);
 451   sua_size = dirent.len - sua_off;
 452
 453   symlink = grub_malloc (1);
 454   if (!symlink)
 455     return 0;
 456
 457   *symlink = '\0';
 458
 459   if (grub_iso9660_susp_iterate (node->data, node->dir_blk,
 460                                  node->dir_off + sua_off,
 461                                  sua_size, susp_iterate_sl))
 462     {
 463       grub_free (symlink);
 464       return 0;
 465     }
 466
 467   return symlink;
 468 }
 469
 470
 471 static int
 472 grub_iso9660_iterate_dir (grub_fshelp_node_t dir,
 473                           int NESTED_FUNC_ATTR
 474                           (*hook) (const char *filename,
 475                                    enum grub_fshelp_filetype filetype,
 476                                    grub_fshelp_node_t node))
 477 {
 478   struct grub_iso9660_dir dirent;
 479   unsigned int offset = 0;
 480   char *filename;
 481   int filename_alloc = 0;
 482   enum grub_fshelp_filetype type;
 483
 484   auto grub_err_t susp_iterate_dir (struct grub_iso9660_susp_entry *);
 485
 486   grub_err_t susp_iterate_dir (struct grub_iso9660_susp_entry *entry)
 487     {
 488       /* The filename in the rock ridge entry.  */
 489       if (grub_strncmp ("NM", (char *) entry->sig, 2) == 0)
 490         {
 491           /* The flags are stored at the data position 0, here the
 492              filename type is stored.  */
 493           if (entry->data[0] & GRUB_ISO9660_RR_DOT)
 494             filename = ".";
 495           else if (entry->data[0] & GRUB_ISO9660_RR_DOTDOT)
 496             filename = "..";
 497           else
 498             {
 499               int size = 1;
 500               if (filename)
 501                 {
 502                   size += grub_strlen (filename);
 503                   grub_realloc (filename,
 504                                 grub_strlen (filename)
 505                                 + entry->len);
 506                 }
 507               else
 508                 {
 509                   size = entry->len - 5;
 510                   filename = grub_zalloc (size + 1);
 511                 }
 512               filename_alloc = 1;
 513               grub_strncpy (filename, (char *) &entry->data[1], size);
 514               filename[size] = '\0';
 515             }
 516         }
 517       /* The mode information (st_mode).  */
 518       else if (grub_strncmp ((char *) entry->sig, "PX", 2) == 0)
 519         {
 520           /* At position 0 of the PX record the st_mode information is
 521              stored (little-endian).  */
 522           grub_uint32_t mode = ((entry->data[0] + (entry->data[1] << 8))
 523                                 & GRUB_ISO9660_FSTYPE_MASK);
 524
 525           switch (mode)
 526             {
 527             case GRUB_ISO9660_FSTYPE_DIR:
 528               type = GRUB_FSHELP_DIR;
 529               break;
 530             case GRUB_ISO9660_FSTYPE_REG:
 531               type = GRUB_FSHELP_REG;
 532               break;
 533             case GRUB_ISO9660_FSTYPE_SYMLINK:
 534               type = GRUB_FSHELP_SYMLINK;
 535               break;
 536             default:
 537               type = GRUB_FSHELP_UNKNOWN;
 538             }
 539         }
 540
 541       return 0;
 542     }
 543
 544   while (offset < dir->size)
 545     {
 546       if (grub_disk_read (dir->data->disk,
 547                           (dir->blk << GRUB_ISO9660_LOG2_BLKSZ)
 548                           + offset / GRUB_DISK_SECTOR_SIZE,
 549                           offset % GRUB_DISK_SECTOR_SIZE,
 550                           sizeof (dirent), (char *) &dirent))
 551         return 0;
 552
 553       /* The end of the block, skip to the next one.  */
 554       if (!dirent.len)
 555         {
 556           offset = (offset / GRUB_ISO9660_BLKSZ + 1) * GRUB_ISO9660_BLKSZ;
 557           continue;
 558         }
 559
 560       {
 561         char name[dirent.namelen + 1];
 562         int nameoffset = offset + sizeof (dirent);
 563         struct grub_fshelp_node *node;
 564         int sua_off = (sizeof (dirent) + dirent.namelen + 1
 565                        - (dirent.namelen % 2));
 566         int sua_size = dirent.len - sua_off;
 567
 568         sua_off += offset + dir->data->susp_skip;
 569
 570         filename = 0;
 571         filename_alloc = 0;
 572         type = GRUB_FSHELP_UNKNOWN;
 573
 574         if (dir->data->rockridge
 575             && grub_iso9660_susp_iterate (dir->data,
 576                                           (dir->blk << GRUB_ISO9660_LOG2_BLKSZ)
 577                                           + (sua_off
 578                                              / GRUB_DISK_SECTOR_SIZE),
 579                                           sua_off % GRUB_DISK_SECTOR_SIZE,
 580                                           sua_size, susp_iterate_dir))
 581           return 0;
 582
 583         /* Read the name.  */
 584         if (grub_disk_read (dir->data->disk,
 585                             (dir->blk << GRUB_ISO9660_LOG2_BLKSZ)
 586                             + nameoffset / GRUB_DISK_SECTOR_SIZE,
 587                             nameoffset % GRUB_DISK_SECTOR_SIZE,
 588                             dirent.namelen, (char *) name))
 589           return 0;
 590
 591         node = grub_malloc (sizeof (struct grub_fshelp_node));
 592         if (!node)
 593           return 0;
 594
 595         /* Setup a new node.  */
 596         node->data = dir->data;
 597         node->size = grub_le_to_cpu32 (dirent.size);
 598         node->blk = grub_le_to_cpu32 (dirent.first_sector);
 599         node->dir_blk = ((dir->blk << GRUB_ISO9660_LOG2_BLKSZ)
 600                          + offset / GRUB_DISK_SECTOR_SIZE);
 601         node->dir_off = offset % GRUB_DISK_SECTOR_SIZE;
 602
 603         /* If the filetype was not stored using rockridge, use
 604            whatever is stored in the iso9660 filesystem.  */
 605         if (type == GRUB_FSHELP_UNKNOWN)
 606           {
 607             if ((dirent.flags & 3) == 2)
 608               type = GRUB_FSHELP_DIR;
 609             else
 610               type = GRUB_FSHELP_REG;
 611           }
 612
 613         /* The filename was not stored in a rock ridge entry.  Read it
 614            from the iso9660 filesystem.  */
 615         if (!filename)
 616           {
 617             name[dirent.namelen] = '\0';
 618             filename = grub_strrchr (name, ';');
 619             if (filename)
 620               *filename = '\0';
 621
 622             if (dirent.namelen == 1 && name[0] == 0)
 623               filename = ".";
 624             else if (dirent.namelen == 1 && name[0] == 1)
 625               filename = "..";
 626             else
 627               filename = name;
 628           }
 629
 630         if (dir->data->joliet)
 631           {
 632             char *oldname;
 633
 634             oldname = filename;
 635             filename = grub_iso9660_convert_string
 636                   ((grub_uint16_t *) oldname, dirent.namelen >> 1);
 637
 638             if (filename_alloc)
 639               grub_free (oldname);
 640
 641             filename_alloc = 1;
 642           }
 643
 644         if (hook (filename, type, node))
 645           {
 646             if (filename_alloc)
 647               grub_free (filename);
 648             return 1;
 649           }
 650         if (filename_alloc)
 651           grub_free (filename);
 652       }
 653
 654       offset += dirent.len;
 655     }
 656
 657   return 0;
 658 }
 659
 660
 661 \f
 662 static grub_err_t
 663 grub_iso9660_dir (grub_device_t device, const char *path,
 664                   int (*hook) (const char *filename,
 665                                const struct grub_dirhook_info *info))
 666 {
 667   struct grub_iso9660_data *data = 0;
 668   struct grub_fshelp_node rootnode;
 669   struct grub_fshelp_node *foundnode;
 670
 671   auto int NESTED_FUNC_ATTR iterate (const char *filename,
 672                                      enum grub_fshelp_filetype filetype,
 673                                      grub_fshelp_node_t node);
 674
 675   int NESTED_FUNC_ATTR iterate (const char *filename,
 676                                 enum grub_fshelp_filetype filetype,
 677                                 grub_fshelp_node_t node)
 678     {
 679       struct grub_dirhook_info info;
 680       grub_memset (&info, 0, sizeof (info));
 681       info.dir = ((filetype & GRUB_FSHELP_TYPE_MASK) == GRUB_FSHELP_DIR);
 682       grub_free (node);
 683       return hook (filename, &info);
 684     }
 685
 686   grub_dl_ref (my_mod);
 687
 688   data = grub_iso9660_mount (device->disk);
 689   if (! data)
 690     goto fail;
 691
 692   rootnode.data = data;
 693   rootnode.blk = grub_le_to_cpu32 (data->voldesc.rootdir.first_sector);
 694   rootnode.size = grub_le_to_cpu32 (data->voldesc.rootdir.size);
 695
 696   /* Use the fshelp function to traverse the path.  */
 697   if (grub_fshelp_find_file (path, &rootnode,
 698                              &foundnode,
 699                              grub_iso9660_iterate_dir,
 700                              grub_iso9660_read_symlink,
 701                              GRUB_FSHELP_DIR))
 702     goto fail;
 703
 704   /* List the files in the directory.  */
 705   grub_iso9660_iterate_dir (foundnode, iterate);
 706
 707   if (foundnode != &rootnode)
 708     grub_free (foundnode);
 709
 710  fail:
 711   grub_free (data);
 712
 713   grub_dl_unref (my_mod);
 714
 715   return grub_errno;
 716 }
 717
 718
 719 /* Open a file named NAME and initialize FILE.  */
 720 static grub_err_t
 721 grub_iso9660_open (struct grub_file *file, const char *name)
 722 {
 723   struct grub_iso9660_data *data;
 724   struct grub_fshelp_node rootnode;
 725   struct grub_fshelp_node *foundnode;
 726
 727   grub_dl_ref (my_mod);
 728
 729   data = grub_iso9660_mount (file->device->disk);
 730   if (!data)
 731     goto fail;
 732
 733   rootnode.data = data;
 734   rootnode.blk = grub_le_to_cpu32 (data->voldesc.rootdir.first_sector);
 735   rootnode.size = grub_le_to_cpu32 (data->voldesc.rootdir.size);
 736
 737   /* Use the fshelp function to traverse the path.  */
 738   if (grub_fshelp_find_file (name, &rootnode,
 739                              &foundnode,
 740                              grub_iso9660_iterate_dir,
 741                              grub_iso9660_read_symlink,
 742                              GRUB_FSHELP_REG))
 743     goto fail;
 744
 745   data->first_sector = foundnode->blk;
 746   data->length = foundnode->size;
 747
 748   file->data = data;
 749   file->size = foundnode->size;
 750   file->offset = 0;
 751
 752   return 0;
 753
 754  fail:
 755   grub_dl_unref (my_mod);
 756
 757   grub_free (data);
 758
 759   return grub_errno;
 760 }
 761
 762
 763 static grub_ssize_t
 764 grub_iso9660_read (grub_file_t file, char *buf, grub_size_t len)
 765 {
 766   struct grub_iso9660_data *data =
 767     (struct grub_iso9660_data *) file->data;
 768
 769   /* XXX: The file is stored in as a single extent.  */
 770   data->disk->read_hook = file->read_hook;
 771   grub_disk_read (data->disk,
 772                   data->first_sector << GRUB_ISO9660_LOG2_BLKSZ,
 773                   file->offset,
 774                   len, buf);
 775   data->disk->read_hook = 0;
 776
 777   return len;
 778 }
 779
 780
 781 static grub_err_t
 782 grub_iso9660_close (grub_file_t file)
 783 {
 784   grub_free (file->data);
 785
 786   grub_dl_unref (my_mod);
 787
 788   return GRUB_ERR_NONE;
 789 }
 790
 791
 792 static grub_err_t
 793 grub_iso9660_label (grub_device_t device, char **label)
 794 {
 795   struct grub_iso9660_data *data;
 796   data = grub_iso9660_mount (device->disk);
 797
 798   if (data)
 799     {
 800       if (data->joliet)
 801         *label = grub_iso9660_convert_string
 802                  ((grub_uint16_t *) &data->voldesc.volname, 16);
 803       else
 804         *label = grub_strndup ((char *) data->voldesc.volname, 32);
 805       grub_free (data);
 806     }
 807   else
 808     *label = 0;
 809
 810   return grub_errno;
 811 }
 812
 813
 814 static grub_err_t
 815 grub_iso9660_uuid (grub_device_t device, char **uuid)
 816 {
 817   struct grub_iso9660_data *data;
 818   grub_disk_t disk = device->disk;
 819
 820   grub_dl_ref (my_mod);
 821
 822   data = grub_iso9660_mount (disk);
 823   if (data)
 824     {
 825       if (! data->voldesc.modified.year[0] && ! data->voldesc.modified.year[1]
 826           && ! data->voldesc.modified.year[2] && ! data->voldesc.modified.year[3]
 827           && ! data->voldesc.modified.month[0] && ! data->voldesc.modified.month[1]
 828           && ! data->voldesc.modified.day[0] && ! data->voldesc.modified.day[1]
 829           && ! data->voldesc.modified.hour[0] && ! data->voldesc.modified.hour[1]
 830           && ! data->voldesc.modified.minute[0] && ! data->voldesc.modified.minute[1]
 831           && ! data->voldesc.modified.second[0] && ! data->voldesc.modified.second[1]
 832           && ! data->voldesc.modified.hundredth[0] && ! data->voldesc.modified.hundredth[1])
 833         {
 834           grub_error (GRUB_ERR_BAD_NUMBER, "No creation date in filesystem to generate UUID.");
 835           *uuid = NULL;
 836         }
 837       else
 838         {
 839           *uuid = grub_malloc (sizeof ("YYYY-MM-DD-HH-mm-ss-hh"));
 840           grub_sprintf (*uuid, "%c%c%c%c-%c%c-%c%c-%c%c-%c%c-%c%c-%c%c",
 841                         data->voldesc.modified.year[0], data->voldesc.modified.year[1],
 842                         data->voldesc.modified.year[2], data->voldesc.modified.year[3],
 843                         data->voldesc.modified.month[0], data->voldesc.modified.month[1],
 844                         data->voldesc.modified.day[0], data->voldesc.modified.day[1],
 845                         data->voldesc.modified.hour[0], data->voldesc.modified.hour[1],
 846                         data->voldesc.modified.minute[0], data->voldesc.modified.minute[1],
 847                         data->voldesc.modified.second[0], data->voldesc.modified.second[1],
 848                         data->voldesc.modified.hundredth[0], data->voldesc.modified.hundredth[1]);
 849         }
 850     }
 851   else
 852     *uuid = NULL;
 853
 854         grub_dl_unref (my_mod);
 855
 856   grub_free (data);
 857
 858   return grub_errno;
 859 }
 860
 861 \f
 862
 863 static struct grub_fs grub_iso9660_fs =
 864   {
 865     .name = "iso9660",
 866     .dir = grub_iso9660_dir,
 867     .open = grub_iso9660_open,
 868     .read = grub_iso9660_read,
 869     .close = grub_iso9660_close,
 870     .label = grub_iso9660_label,
 871     .uuid = grub_iso9660_uuid,
 872     .next = 0
 873   };
 874
 875 GRUB_MOD_INIT(iso9660)
 876 {
 877   grub_fs_register (&grub_iso9660_fs);
 878   my_mod = mod;
 879 }
 880
 881 GRUB_MOD_FINI(iso9660)
 882 {
 883   grub_fs_unregister (&grub_iso9660_fs);
 884 }