arch/common/boot/grub2/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  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 #ifndef GRUB_UTIL
 154 static grub_dl_t my_mod;
 155 #endif
 156 \f
 157
 158 /* Iterate over the susp entries, starting with block SUA_BLOCK on the
 159    offset SUA_POS with a size of SUA_SIZE bytes.  Hook is called for
 160    every entry.  */
 161 static grub_err_t
 162 grub_iso9660_susp_iterate (struct grub_iso9660_data *data,
 163                            int sua_block, int sua_pos, int sua_size,
 164                            grub_err_t (*hook)
 165                            (struct grub_iso9660_susp_entry *entry))
 166 {
 167   char *sua;
 168   struct grub_iso9660_susp_entry *entry;
 169
 170   auto grub_err_t load_sua (void);
 171
 172   /* Load a part of the System Usage Area.  */
 173   grub_err_t load_sua (void)
 174     {
 175       sua = grub_malloc (sua_size);
 176       if (!sua)
 177         return grub_errno;
 178
 179       if (grub_disk_read (data->disk, sua_block, sua_pos,
 180                           sua_size, sua))
 181         return grub_errno;
 182
 183       entry = (struct grub_iso9660_susp_entry *) sua;
 184       return 0;
 185     }
 186
 187   if (load_sua ())
 188     return grub_errno;
 189
 190   for (; (char *) entry < (char *) sua + sua_size - 1;
 191        entry = (struct grub_iso9660_susp_entry *)
 192          ((char *) entry + entry->len))
 193     {
 194       /* The last entry.  */
 195       if (grub_strncmp ((char *) entry->sig, "ST", 2) == 0)
 196         break;
 197
 198       /* Additional entries are stored elsewhere.  */
 199       if (grub_strncmp ((char *) entry->sig, "CE", 2) == 0)
 200         {
 201           struct grub_iso9660_susp_ce *ce;
 202
 203           ce = (struct grub_iso9660_susp_ce *) entry;
 204           sua_size = grub_le_to_cpu32 (ce->len);
 205           sua_pos = grub_le_to_cpu32 (ce->off);
 206           sua_block = grub_le_to_cpu32 (ce->blk) << GRUB_ISO9660_LOG2_BLKSZ;
 207
 208           grub_free (sua);
 209           if (load_sua ())
 210             return grub_errno;
 211         }
 212
 213       if (hook (entry))
 214         {
 215           grub_free (sua);
 216           return 0;
 217         }
 218     }
 219
 220   grub_free (sua);
 221   return 0;
 222 }
 223
 224 static char *
 225 grub_iso9660_convert_string (grub_uint16_t *us, int len)
 226 {
 227   char *p;
 228   int i;
 229
 230   p = grub_malloc (len * 4 + 1);
 231   if (! p)
 232     return p;
 233
 234   for (i=0; i<len; i++)
 235     us[i] = grub_be_to_cpu16 (us[i]);
 236
 237   *grub_utf16_to_utf8 ((grub_uint8_t *) p, us, len) = '\0';
 238
 239   return p;
 240 }
 241
 242 static struct grub_iso9660_data *
 243 grub_iso9660_mount (grub_disk_t disk)
 244 {
 245   struct grub_iso9660_data *data = 0;
 246   struct grub_iso9660_dir rootdir;
 247   int sua_pos;
 248   int sua_size;
 249   char *sua;
 250   struct grub_iso9660_susp_entry *entry;
 251   struct grub_iso9660_primary_voldesc voldesc;
 252   int block;
 253
 254   auto grub_err_t susp_iterate (struct grub_iso9660_susp_entry *);
 255
 256   grub_err_t susp_iterate (struct grub_iso9660_susp_entry *susp_entry)
 257     {
 258       /* The "ER" entry is used to detect extensions.  The
 259          `IEEE_P1285' extension means Rock ridge.  */
 260       if (grub_strncmp ((char *) susp_entry->sig, "ER", 2) == 0)
 261         {
 262           data->rockridge = 1;
 263           return 1;
 264         }
 265       return 0;
 266     }
 267
 268   data = grub_malloc (sizeof (struct grub_iso9660_data));
 269   if (! data)
 270     return 0;
 271
 272   data->disk = disk;
 273   data->rockridge = 0;
 274   data->joliet = 0;
 275
 276   block = 16;
 277   do
 278     {
 279       int copy_voldesc = 0;
 280
 281       /* Read the superblock.  */
 282       if (grub_disk_read (disk, block << GRUB_ISO9660_LOG2_BLKSZ, 0,
 283                           sizeof (struct grub_iso9660_primary_voldesc),
 284                           (char *) &voldesc))
 285         {
 286           grub_error (GRUB_ERR_BAD_FS, "not a iso9660 filesystem");
 287           goto fail;
 288         }
 289
 290       if (grub_strncmp ((char *) voldesc.voldesc.magic, "CD001", 5) != 0)
 291         {
 292           grub_error (GRUB_ERR_BAD_FS, "not a iso9660 filesystem");
 293           goto fail;
 294         }
 295
 296       if (voldesc.voldesc.type == GRUB_ISO9660_VOLDESC_PRIMARY)
 297         copy_voldesc = 1;
 298       else if ((voldesc.voldesc.type == GRUB_ISO9660_VOLDESC_SUPP) &&
 299                (voldesc.escape[0] == 0x25) && (voldesc.escape[1] == 0x2f) &&
 300                ((voldesc.escape[2] == 0x40) ||  /* UCS-2 Level 1.  */
 301                 (voldesc.escape[2] == 0x43) ||  /* UCS-2 Level 2.  */
 302                 (voldesc.escape[2] == 0x45)))   /* UCS-2 Level 3.  */
 303         {
 304           copy_voldesc = 1;
 305           data->joliet = 1;
 306         }
 307
 308       if (copy_voldesc)
 309         grub_memcpy((char *) &data->voldesc, (char *) &voldesc,
 310                     sizeof (struct grub_iso9660_primary_voldesc));
 311
 312       block++;
 313     } while (voldesc.voldesc.type != GRUB_ISO9660_VOLDESC_END);
 314
 315   /* Read the system use area and test it to see if SUSP is
 316      supported.  */
 317   if (grub_disk_read (disk, (grub_le_to_cpu32 (data->voldesc.rootdir.first_sector)
 318                              << GRUB_ISO9660_LOG2_BLKSZ), 0,
 319                       sizeof (rootdir), (char *) &rootdir))
 320     {
 321       grub_error (GRUB_ERR_BAD_FS, "not a iso9660 filesystem");
 322       goto fail;
 323     }
 324
 325   sua_pos = (sizeof (rootdir) + rootdir.namelen
 326              + (rootdir.namelen % 2) - 1);
 327   sua_size = rootdir.len - sua_pos;
 328
 329   sua = grub_malloc (sua_size);
 330   if (! sua)
 331     goto fail;
 332
 333   if (grub_disk_read (disk, (grub_le_to_cpu32 (data->voldesc.rootdir.first_sector)
 334                              << GRUB_ISO9660_LOG2_BLKSZ), sua_pos,
 335                       sua_size, sua))
 336     {
 337       grub_error (GRUB_ERR_BAD_FS, "not a iso9660 filesystem");
 338       goto fail;
 339     }
 340
 341   entry = (struct grub_iso9660_susp_entry *) sua;
 342
 343   /* Test if the SUSP protocol is used on this filesystem.  */
 344   if (grub_strncmp ((char *) entry->sig, "SP", 2) == 0)
 345     {
 346       /* The 2nd data byte stored how many bytes are skipped every time
 347          to get to the SUA (System Usage Area).  */
 348       data->susp_skip = entry->data[2];
 349       entry = (struct grub_iso9660_susp_entry *) ((char *) entry + entry->len);
 350
 351       /* Iterate over the entries in the SUA area to detect
 352          extensions.  */
 353       if (grub_iso9660_susp_iterate (data,
 354                                      (grub_le_to_cpu32 (data->voldesc.rootdir.first_sector)
 355                                       << GRUB_ISO9660_LOG2_BLKSZ),
 356                                      sua_pos, sua_size, susp_iterate))
 357         goto fail;
 358     }
 359
 360   return data;
 361
 362  fail:
 363   grub_free (data);
 364   return 0;
 365 }
 366
 367
 368 static char *
 369 grub_iso9660_read_symlink (grub_fshelp_node_t node)
 370 {
 371   struct grub_iso9660_dir dirent;
 372   int sua_off;
 373   int sua_size;
 374   char *symlink = 0;
 375   int addslash = 0;
 376
 377   auto void add_part (const char *part, int len);
 378   auto grub_err_t susp_iterate_sl (struct grub_iso9660_susp_entry *);
 379
 380   /* Extend the symlink.  */
 381   void add_part (const char *part, int len)
 382     {
 383       int size = grub_strlen (symlink);
 384
 385       symlink = grub_realloc (symlink, size + len + 1);
 386       if (! symlink)
 387         return;
 388
 389       grub_strncat (symlink, part, len);
 390     }
 391
 392   /* Read in a symlink.  */
 393   grub_err_t susp_iterate_sl (struct grub_iso9660_susp_entry *entry)
 394     {
 395       if (grub_strncmp ("SL", (char *) entry->sig, 2) == 0)
 396         {
 397           unsigned int pos = 1;
 398
 399           /* The symlink is not stored as a POSIX symlink, translate it.  */
 400           while (pos < grub_le_to_cpu32 (entry->len))
 401             {
 402               if (addslash)
 403                 {
 404                   add_part ("/", 1);
 405                   addslash = 0;
 406                 }
 407
 408               /* The current position is the `Component Flag'.  */
 409               switch (entry->data[pos] & 30)
 410                 {
 411                 case 0:
 412                   {
 413                     /* The data on pos + 2 is the actual data, pos + 1
 414                        is the length.  Both are part of the `Component
 415                        Record'.  */
 416                     add_part ((char *) &entry->data[pos + 2],
 417                               entry->data[pos + 1]);
 418                     if ((entry->data[pos] & 1))
 419                       addslash = 1;
 420
 421                     break;
 422                   }
 423
 424                 case 2:
 425                   add_part ("./", 2);
 426                   break;
 427
 428                 case 4:
 429                   add_part ("../", 3);
 430                   break;
 431
 432                 case 8:
 433                   add_part ("/", 1);
 434                   break;
 435                 }
 436               /* In pos + 1 the length of the `Component Record' is
 437                  stored.  */
 438               pos += entry->data[pos + 1] + 2;
 439             }
 440
 441           /* Check if `grub_realloc' failed.  */
 442           if (grub_errno)
 443             return grub_errno;
 444         }
 445
 446       return 0;
 447     }
 448
 449   if (grub_disk_read (node->data->disk, node->dir_blk, node->dir_off,
 450                       sizeof (dirent), (char *) &dirent))
 451     return 0;
 452
 453   sua_off = (sizeof (dirent) + dirent.namelen + 1 - (dirent.namelen % 2)
 454              + node->data->susp_skip);
 455   sua_size = dirent.len - sua_off;
 456
 457   symlink = grub_malloc (1);
 458   if (!symlink)
 459     return 0;
 460
 461   *symlink = '\0';
 462
 463   if (grub_iso9660_susp_iterate (node->data, node->dir_blk,
 464                                  node->dir_off + sua_off,
 465                                  sua_size, susp_iterate_sl))
 466     {
 467       grub_free (symlink);
 468       return 0;
 469     }
 470
 471   return symlink;
 472 }
 473
 474
 475 static int
 476 grub_iso9660_iterate_dir (grub_fshelp_node_t dir,
 477                           int NESTED_FUNC_ATTR
 478                           (*hook) (const char *filename,
 479                                    enum grub_fshelp_filetype filetype,
 480                                    grub_fshelp_node_t node))
 481 {
 482   struct grub_iso9660_dir dirent;
 483   unsigned int offset = 0;
 484   char *filename;
 485   int filename_alloc = 0;
 486   enum grub_fshelp_filetype type;
 487
 488   auto grub_err_t susp_iterate_dir (struct grub_iso9660_susp_entry *);
 489
 490   grub_err_t susp_iterate_dir (struct grub_iso9660_susp_entry *entry)
 491     {
 492       /* The filename in the rock ridge entry.  */
 493       if (grub_strncmp ("NM", (char *) entry->sig, 2) == 0)
 494         {
 495           /* The flags are stored at the data position 0, here the
 496              filename type is stored.  */
 497           if (entry->data[0] & GRUB_ISO9660_RR_DOT)
 498             filename = ".";
 499           else if (entry->data[0] & GRUB_ISO9660_RR_DOTDOT)
 500             filename = "..";
 501           else
 502             {
 503               int size = 1;
 504               if (filename)
 505                 {
 506                   size += grub_strlen (filename);
 507                   grub_realloc (filename,
 508                                 grub_strlen (filename)
 509                                 + entry->len);
 510                 }
 511               else
 512                 {
 513                   size = entry->len - 5;
 514                   filename = grub_malloc (size + 1);
 515                   filename[0] = '\0';
 516                 }
 517               filename_alloc = 1;
 518               grub_strncpy (filename, (char *) &entry->data[1], size);
 519               filename[size] = '\0';
 520             }
 521         }
 522       /* The mode information (st_mode).  */
 523       else if (grub_strncmp ((char *) entry->sig, "PX", 2) == 0)
 524         {
 525           /* At position 0 of the PX record the st_mode information is
 526              stored.  */
 527           grub_uint32_t mode = ((*(grub_uint32_t *) &entry->data[0])
 528                                 & GRUB_ISO9660_FSTYPE_MASK);
 529
 530           switch (mode)
 531             {
 532             case GRUB_ISO9660_FSTYPE_DIR:
 533               type = GRUB_FSHELP_DIR;
 534               break;
 535             case GRUB_ISO9660_FSTYPE_REG:
 536               type = GRUB_FSHELP_REG;
 537               break;
 538             case GRUB_ISO9660_FSTYPE_SYMLINK:
 539               type = GRUB_FSHELP_SYMLINK;
 540               break;
 541             default:
 542               type = GRUB_FSHELP_UNKNOWN;
 543             }
 544         }
 545
 546       return 0;
 547     }
 548
 549   while (offset < dir->size)
 550     {
 551       if (grub_disk_read (dir->data->disk,
 552                           (dir->blk << GRUB_ISO9660_LOG2_BLKSZ)
 553                           + offset / GRUB_DISK_SECTOR_SIZE,
 554                           offset % GRUB_DISK_SECTOR_SIZE,
 555                           sizeof (dirent), (char *) &dirent))
 556         return 0;
 557
 558       /* The end of the block, skip to the next one.  */
 559       if (!dirent.len)
 560         {
 561           offset = (offset / GRUB_ISO9660_BLKSZ + 1) * GRUB_ISO9660_BLKSZ;
 562           continue;
 563         }
 564
 565       {
 566         char name[dirent.namelen + 1];
 567         int nameoffset = offset + sizeof (dirent);
 568         struct grub_fshelp_node *node;
 569         int sua_off = (sizeof (dirent) + dirent.namelen + 1
 570                        - (dirent.namelen % 2));;
 571         int sua_size = dirent.len - sua_off;
 572
 573         sua_off += offset + dir->data->susp_skip;
 574
 575         filename = 0;
 576         filename_alloc = 0;
 577         type = GRUB_FSHELP_UNKNOWN;
 578
 579         if (dir->data->rockridge
 580             && grub_iso9660_susp_iterate (dir->data,
 581                                           (dir->blk << GRUB_ISO9660_LOG2_BLKSZ)
 582                                           + (sua_off
 583                                              / GRUB_DISK_SECTOR_SIZE),
 584                                           sua_off % GRUB_DISK_SECTOR_SIZE,
 585                                           sua_size, susp_iterate_dir))
 586           return 0;
 587
 588         /* Read the name.  */
 589         if (grub_disk_read (dir->data->disk,
 590                             (dir->blk << GRUB_ISO9660_LOG2_BLKSZ)
 591                             + nameoffset / GRUB_DISK_SECTOR_SIZE,
 592                             nameoffset % GRUB_DISK_SECTOR_SIZE,
 593                             dirent.namelen, (char *) name))
 594           return 0;
 595
 596         node = grub_malloc (sizeof (struct grub_fshelp_node));
 597         if (!node)
 598           return 0;
 599
 600         /* Setup a new node.  */
 601         node->data = dir->data;
 602         node->size = grub_le_to_cpu32 (dirent.size);
 603         node->blk = grub_le_to_cpu32 (dirent.first_sector);
 604         node->dir_blk = ((dir->blk << GRUB_ISO9660_LOG2_BLKSZ)
 605                          + offset / GRUB_DISK_SECTOR_SIZE);
 606         node->dir_off = offset % GRUB_DISK_SECTOR_SIZE;
 607
 608         /* If the filetype was not stored using rockridge, use
 609            whatever is stored in the iso9660 filesystem.  */
 610         if (type == GRUB_FSHELP_UNKNOWN)
 611           {
 612             if ((dirent.flags & 3) == 2)
 613               type = GRUB_FSHELP_DIR;
 614             else
 615               type = GRUB_FSHELP_REG;
 616           }
 617
 618         /* The filename was not stored in a rock ridge entry.  Read it
 619            from the iso9660 filesystem.  */
 620         if (!filename)
 621           {
 622             name[dirent.namelen] = '\0';
 623             filename = grub_strrchr (name, ';');
 624             if (filename)
 625               *filename = '\0';
 626
 627             if (dirent.namelen == 1 && name[0] == 0)
 628               filename = ".";
 629             else if (dirent.namelen == 1 && name[0] == 1)
 630               filename = "..";
 631             else
 632               filename = name;
 633           }
 634
 635         if (dir->data->joliet)
 636           {
 637             char *oldname;
 638
 639             oldname = filename;
 640             filename = grub_iso9660_convert_string
 641                   ((grub_uint16_t *) oldname, dirent.namelen >> 1);
 642
 643             if (filename_alloc)
 644               grub_free (oldname);
 645
 646             filename_alloc = 1;
 647           }
 648
 649         if (hook (filename, type, node))
 650           {
 651             if (filename_alloc)
 652               grub_free (filename);
 653             return 1;
 654           }
 655         if (filename_alloc)
 656           grub_free (filename);
 657       }
 658
 659       offset += dirent.len;
 660     }
 661
 662   return 0;
 663 }
 664
 665
 666 \f
 667 static grub_err_t
 668 grub_iso9660_dir (grub_device_t device, const char *path,
 669                   int (*hook) (const char *filename, int dir))
 670 {
 671   struct grub_iso9660_data *data = 0;
 672   struct grub_fshelp_node rootnode;
 673   struct grub_fshelp_node *foundnode;
 674
 675   auto int NESTED_FUNC_ATTR iterate (const char *filename,
 676                                      enum grub_fshelp_filetype filetype,
 677                                      grub_fshelp_node_t node);
 678
 679   int NESTED_FUNC_ATTR iterate (const char *filename,
 680                                 enum grub_fshelp_filetype filetype,
 681                                 grub_fshelp_node_t node)
 682     {
 683       grub_free (node);
 684
 685       if (filetype == GRUB_FSHELP_DIR)
 686         return hook (filename, 1);
 687       else
 688         return hook (filename, 0);
 689
 690       return 0;
 691     }
 692
 693 #ifndef GRUB_UTIL
 694   grub_dl_ref (my_mod);
 695 #endif
 696
 697   data = grub_iso9660_mount (device->disk);
 698   if (! data)
 699     goto fail;
 700
 701   rootnode.data = data;
 702   rootnode.blk = grub_le_to_cpu32 (data->voldesc.rootdir.first_sector);
 703   rootnode.size = grub_le_to_cpu32 (data->voldesc.rootdir.size);
 704
 705   /* Use the fshelp function to traverse the path.  */
 706   if (grub_fshelp_find_file (path, &rootnode,
 707                              &foundnode,
 708                              grub_iso9660_iterate_dir,
 709                              grub_iso9660_read_symlink,
 710                              GRUB_FSHELP_DIR))
 711     goto fail;
 712
 713   /* List the files in the directory.  */
 714   grub_iso9660_iterate_dir (foundnode, iterate);
 715
 716   if (foundnode != &rootnode)
 717     grub_free (foundnode);
 718
 719  fail:
 720   grub_free (data);
 721
 722 #ifndef GRUB_UTIL
 723   grub_dl_unref (my_mod);
 724 #endif
 725
 726   return grub_errno;
 727 }
 728
 729
 730 /* Open a file named NAME and initialize FILE.  */
 731 static grub_err_t
 732 grub_iso9660_open (struct grub_file *file, const char *name)
 733 {
 734   struct grub_iso9660_data *data;
 735   struct grub_fshelp_node rootnode;
 736   struct grub_fshelp_node *foundnode;
 737
 738 #ifndef GRUB_UTIL
 739   grub_dl_ref (my_mod);
 740 #endif
 741
 742   data = grub_iso9660_mount (file->device->disk);
 743   if (!data)
 744     goto fail;
 745
 746   rootnode.data = data;
 747   rootnode.blk = grub_le_to_cpu32 (data->voldesc.rootdir.first_sector);
 748   rootnode.size = grub_le_to_cpu32 (data->voldesc.rootdir.size);
 749
 750   /* Use the fshelp function to traverse the path.  */
 751   if (grub_fshelp_find_file (name, &rootnode,
 752                              &foundnode,
 753                              grub_iso9660_iterate_dir,
 754                              grub_iso9660_read_symlink,
 755                              GRUB_FSHELP_REG))
 756     goto fail;
 757
 758   data->first_sector = foundnode->blk;
 759   data->length = foundnode->size;
 760
 761   file->data = data;
 762   file->size = foundnode->size;
 763   file->offset = 0;
 764
 765   return 0;
 766
 767  fail:
 768 #ifndef GRUB_UTIL
 769   grub_dl_unref (my_mod);
 770 #endif
 771
 772   grub_free (data);
 773
 774   return grub_errno;;
 775 }
 776
 777
 778 static grub_ssize_t
 779 grub_iso9660_read (grub_file_t file, char *buf, grub_size_t len)
 780 {
 781   struct grub_iso9660_data *data =
 782     (struct grub_iso9660_data *) file->data;
 783
 784   /* XXX: The file is stored in as a single extent.  */
 785   data->disk->read_hook = file->read_hook;
 786   grub_disk_read (data->disk,
 787                   data->first_sector << GRUB_ISO9660_LOG2_BLKSZ,
 788                   file->offset,
 789                   len, buf);
 790   data->disk->read_hook = 0;
 791
 792   return len;
 793 }
 794
 795
 796 static grub_err_t
 797 grub_iso9660_close (grub_file_t file)
 798 {
 799   grub_free (file->data);
 800
 801 #ifndef GRUB_UTIL
 802   grub_dl_unref (my_mod);
 803 #endif
 804
 805   return GRUB_ERR_NONE;
 806 }
 807
 808
 809 static grub_err_t
 810 grub_iso9660_label (grub_device_t device, char **label)
 811 {
 812   struct grub_iso9660_data *data;
 813   data = grub_iso9660_mount (device->disk);
 814
 815   if (data)
 816     {
 817       if (data->joliet)
 818         *label = grub_iso9660_convert_string
 819                  ((grub_uint16_t *) &data->voldesc.volname, 16);
 820       else
 821         *label = grub_strndup ((char *) data->voldesc.volname, 32);
 822       grub_free (data);
 823     }
 824   else
 825     *label = 0;
 826
 827   return grub_errno;
 828 }
 829
 830
 831 static grub_err_t
 832 grub_iso9660_uuid (grub_device_t device, char **uuid)
 833 {
 834   struct grub_iso9660_data *data;
 835   grub_disk_t disk = device->disk;
 836
 837 #ifndef GRUB_UTIL
 838   grub_dl_ref (my_mod);
 839 #endif
 840
 841   data = grub_iso9660_mount (disk);
 842   if (data)
 843     {
 844       if (! 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           grub_error (GRUB_ERR_BAD_NUMBER, "No creation date in filesystem to generate UUID.");
 854           *uuid = NULL;
 855         }
 856       else
 857         {
 858           *uuid = grub_malloc (sizeof ("YYYY-MM-DD-HH-mm-ss-hh"));
 859           grub_sprintf (*uuid, "%c%c%c%c-%c%c-%c%c-%c%c-%c%c-%c%c-%c%c",
 860                         data->voldesc.modified.year[0], data->voldesc.modified.year[1],
 861                         data->voldesc.modified.year[2], data->voldesc.modified.year[3],
 862                         data->voldesc.modified.month[0], data->voldesc.modified.month[1],
 863                         data->voldesc.modified.day[0], data->voldesc.modified.day[1],
 864                         data->voldesc.modified.hour[0], data->voldesc.modified.hour[1],
 865                         data->voldesc.modified.minute[0], data->voldesc.modified.minute[1],
 866                         data->voldesc.modified.second[0], data->voldesc.modified.second[1],
 867                         data->voldesc.modified.hundredth[0], data->voldesc.modified.hundredth[1]);
 868         }
 869     }
 870   else
 871     *uuid = NULL;
 872
 873 #ifndef GRUB_UTIL
 874         grub_dl_unref (my_mod);
 875 #endif
 876
 877   grub_free (data);
 878
 879   return grub_errno;
 880 }
 881
 882 \f
 883
 884 static struct grub_fs grub_iso9660_fs =
 885   {
 886     .name = "iso9660",
 887     .dir = grub_iso9660_dir,
 888     .open = grub_iso9660_open,
 889     .read = grub_iso9660_read,
 890     .close = grub_iso9660_close,
 891     .label = grub_iso9660_label,
 892     .uuid = grub_iso9660_uuid,
 893     .next = 0
 894   };
 895
 896 GRUB_MOD_INIT(iso9660)
 897 {
 898   grub_fs_register (&grub_iso9660_fs);
 899 #ifndef GRUB_UTIL
 900   my_mod = mod;
 901 #endif
 902 }
 903
 904 GRUB_MOD_FINI(iso9660)
 905 {
 906   grub_fs_unregister (&grub_iso9660_fs);
 907 }