fs/fat/fat.c

   1 /*
   2  * fat.c
   3  *
   4  * R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg
   5  *
   6  * 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6
   7  * 2003-03-10 - kharris@nexus-tech.net - ported to uboot
   8  *
   9  * See file CREDITS for list of people who contributed to this
  10  * project.
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License as
  14  * published by the Free Software Foundation; either version 2 of
  15  * the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  25  * MA 02111-1307 USA
  26  */
  27
  28 #include <common.h>
  29 #include <config.h>
  30 #include <fat.h>
  31 #include <asm/byteorder.h>
  32 #include <part.h>
  33
  34 #if defined(CONFIG_CMD_FAT)
  35
  36 /*
  37  * Convert a string to lowercase.
  38  */
  39 static void
  40 downcase(char *str)
  41 {
  42         while (*str != '\0') {
  43                 TOLOWER(*str);
  44                 str++;
  45         }
  46 }
  47
  48 static  block_dev_desc_t *cur_dev = NULL;
  49 static unsigned long part_offset = 0;
  50 static int cur_part = 1;
  51
  52 #define DOS_PART_TBL_OFFSET     0x1be
  53 #define DOS_PART_MAGIC_OFFSET   0x1fe
  54 #define DOS_FS_TYPE_OFFSET      0x36
  55
  56 int disk_read (__u32 startblock, __u32 getsize, __u8 * bufptr)
  57 {
  58         startblock += part_offset;
  59         if (cur_dev == NULL)
  60                 return -1;
  61         if (cur_dev->block_read) {
  62                 return cur_dev->block_read (cur_dev->dev
  63                         , startblock, getsize, (unsigned long *)bufptr);
  64         }
  65         return -1;
  66 }
  67
  68
  69 int
  70 fat_register_device(block_dev_desc_t *dev_desc, int part_no)
  71 {
  72         unsigned char buffer[SECTOR_SIZE];
  73         disk_partition_t info;
  74
  75         if (!dev_desc->block_read)
  76                 return -1;
  77         cur_dev = dev_desc;
  78         /* check if we have a MBR (on floppies we have only a PBR) */
  79         if (dev_desc->block_read (dev_desc->dev, 0, 1, (ulong *) buffer) != 1) {
  80                 printf ("** Can't read from device %d **\n", dev_desc->dev);
  81                 return -1;
  82         }
  83         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
  84                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
  85                 /* no signature found */
  86                 return -1;
  87         }
  88 #if (defined(CONFIG_CMD_IDE) || \
  89      defined(CONFIG_CMD_SCSI) || \
  90      defined(CONFIG_CMD_USB) || \
  91      defined(CONFIG_MMC) || \
  92      defined(CONFIG_SYSTEMACE) )
  93         /* First we assume, there is a MBR */
  94         if (!get_partition_info (dev_desc, part_no, &info)) {
  95                 part_offset = info.start;
  96                 cur_part = part_no;
  97         } else if (!strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET], "FAT", 3)) {
  98                 /* ok, we assume we are on a PBR only */
  99                 cur_part = 1;
 100                 part_offset = 0;
 101         } else {
 102                 printf ("** Partition %d not valid on device %d **\n",
 103                                 part_no, dev_desc->dev);
 104                 return -1;
 105         }
 106
 107 #else
 108         if (!strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET],"FAT",3)) {
 109                 /* ok, we assume we are on a PBR only */
 110                 cur_part = 1;
 111                 part_offset = 0;
 112                 info.start = part_offset;
 113         } else {
 114                 /* FIXME we need to determine the start block of the
 115                  * partition where the DOS FS resides. This can be done
 116                  * by using the get_partition_info routine. For this
 117                  * purpose the libpart must be included.
 118                  */
 119                 part_offset = 32;
 120                 cur_part = 1;
 121         }
 122 #endif
 123         return 0;
 124 }
 125
 126
 127 /*
 128  * Get the first occurence of a directory delimiter ('/' or '\') in a string.
 129  * Return index into string if found, -1 otherwise.
 130  */
 131 static int
 132 dirdelim(char *str)
 133 {
 134         char *start = str;
 135
 136         while (*str != '\0') {
 137                 if (ISDIRDELIM(*str)) return str - start;
 138                 str++;
 139         }
 140         return -1;
 141 }
 142
 143
 144 /*
 145  * Match volume_info fs_type strings.
 146  * Return 0 on match, -1 otherwise.
 147  */
 148 static int
 149 compare_sign(char *str1, char *str2)
 150 {
 151         char *end = str1+SIGNLEN;
 152
 153         while (str1 != end) {
 154                 if (*str1 != *str2) {
 155                         return -1;
 156                 }
 157                 str1++;
 158                 str2++;
 159         }
 160
 161         return 0;
 162 }
 163
 164
 165 /*
 166  * Extract zero terminated short name from a directory entry.
 167  */
 168 static void get_name (dir_entry *dirent, char *s_name)
 169 {
 170         char *ptr;
 171
 172         memcpy (s_name, dirent->name, 8);
 173         s_name[8] = '\0';
 174         ptr = s_name;
 175         while (*ptr && *ptr != ' ')
 176                 ptr++;
 177         if (dirent->ext[0] && dirent->ext[0] != ' ') {
 178                 *ptr = '.';
 179                 ptr++;
 180                 memcpy (ptr, dirent->ext, 3);
 181                 ptr[3] = '\0';
 182                 while (*ptr && *ptr != ' ')
 183                         ptr++;
 184         }
 185         *ptr = '\0';
 186         if (*s_name == DELETED_FLAG)
 187                 *s_name = '\0';
 188         else if (*s_name == aRING)
 189                 *s_name = 'å';
 190         downcase (s_name);
 191 }
 192
 193 /*
 194  * Get the entry at index 'entry' in a FAT (12/16/32) table.
 195  * On failure 0x00 is returned.
 196  */
 197 static __u32
 198 get_fatent(fsdata *mydata, __u32 entry)
 199 {
 200         __u32 bufnum;
 201         __u32 offset;
 202         __u32 ret = 0x00;
 203
 204         switch (mydata->fatsize) {
 205         case 32:
 206                 bufnum = entry / FAT32BUFSIZE;
 207                 offset = entry - bufnum * FAT32BUFSIZE;
 208                 break;
 209         case 16:
 210                 bufnum = entry / FAT16BUFSIZE;
 211                 offset = entry - bufnum * FAT16BUFSIZE;
 212                 break;
 213         case 12:
 214                 bufnum = entry / FAT12BUFSIZE;
 215                 offset = entry - bufnum * FAT12BUFSIZE;
 216                 break;
 217
 218         default:
 219                 /* Unsupported FAT size */
 220                 return ret;
 221         }
 222
 223         /* Read a new block of FAT entries into the cache. */
 224         if (bufnum != mydata->fatbufnum) {
 225                 int getsize = FATBUFSIZE/FS_BLOCK_SIZE;
 226                 __u8 *bufptr = mydata->fatbuf;
 227                 __u32 fatlength = mydata->fatlength;
 228                 __u32 startblock = bufnum * FATBUFBLOCKS;
 229
 230                 fatlength *= SECTOR_SIZE;       /* We want it in bytes now */
 231                 startblock += mydata->fat_sect; /* Offset from start of disk */
 232
 233                 if (getsize > fatlength) getsize = fatlength;
 234                 if (disk_read(startblock, getsize, bufptr) < 0) {
 235                         FAT_DPRINT("Error reading FAT blocks\n");
 236                         return ret;
 237                 }
 238                 mydata->fatbufnum = bufnum;
 239         }
 240
 241         /* Get the actual entry from the table */
 242         switch (mydata->fatsize) {
 243         case 32:
 244                 ret = FAT2CPU32(((__u32*)mydata->fatbuf)[offset]);
 245                 break;
 246         case 16:
 247                 ret = FAT2CPU16(((__u16*)mydata->fatbuf)[offset]);
 248                 break;
 249         case 12: {
 250                 __u32 off16 = (offset*3)/4;
 251                 __u16 val1, val2;
 252
 253                 switch (offset & 0x3) {
 254                 case 0:
 255                         ret = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);
 256                         ret &= 0xfff;
 257                         break;
 258                 case 1:
 259                         val1 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);
 260                         val1 &= 0xf000;
 261                         val2 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16+1]);
 262                         val2 &= 0x00ff;
 263                         ret = (val2 << 4) | (val1 >> 12);
 264                         break;
 265                 case 2:
 266                         val1 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);
 267                         val1 &= 0xff00;
 268                         val2 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16+1]);
 269                         val2 &= 0x000f;
 270                         ret = (val2 << 8) | (val1 >> 8);
 271                         break;
 272                 case 3:
 273                         ret = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);;
 274                         ret = (ret & 0xfff0) >> 4;
 275                         break;
 276                 default:
 277                         break;
 278                 }
 279         }
 280         break;
 281         }
 282         FAT_DPRINT("ret: %d, offset: %d\n", ret, offset);
 283
 284         return ret;
 285 }
 286
 287
 288 /*
 289  * Read at most 'size' bytes from the specified cluster into 'buffer'.
 290  * Return 0 on success, -1 otherwise.
 291  */
 292 static int
 293 get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size)
 294 {
 295         int idx = 0;
 296         __u32 startsect;
 297
 298         if (clustnum > 0) {
 299                 startsect = mydata->data_begin + clustnum*mydata->clust_size;
 300         } else {
 301                 startsect = mydata->rootdir_sect;
 302         }
 303
 304         FAT_DPRINT("gc - clustnum: %d, startsect: %d\n", clustnum, startsect);
 305         if (disk_read(startsect, size/FS_BLOCK_SIZE , buffer) < 0) {
 306                 FAT_DPRINT("Error reading data\n");
 307                 return -1;
 308         }
 309         if(size % FS_BLOCK_SIZE) {
 310                 __u8 tmpbuf[FS_BLOCK_SIZE];
 311                 idx= size/FS_BLOCK_SIZE;
 312                 if (disk_read(startsect + idx, 1, tmpbuf) < 0) {
 313                         FAT_DPRINT("Error reading data\n");
 314                         return -1;
 315                 }
 316                 buffer += idx*FS_BLOCK_SIZE;
 317
 318                 memcpy(buffer, tmpbuf, size % FS_BLOCK_SIZE);
 319                 return 0;
 320         }
 321
 322         return 0;
 323 }
 324
 325
 326 /*
 327  * Read at most 'maxsize' bytes from the file associated with 'dentptr'
 328  * into 'buffer'.
 329  * Return the number of bytes read or -1 on fatal errors.
 330  */
 331 static long
 332 get_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer,
 333              unsigned long maxsize)
 334 {
 335         unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0;
 336         unsigned int bytesperclust = mydata->clust_size * SECTOR_SIZE;
 337         __u32 curclust = START(dentptr);
 338         __u32 endclust, newclust;
 339         unsigned long actsize;
 340
 341         FAT_DPRINT("Filesize: %ld bytes\n", filesize);
 342
 343         if (maxsize > 0 && filesize > maxsize) filesize = maxsize;
 344
 345         FAT_DPRINT("Reading: %ld bytes\n", filesize);
 346
 347         actsize=bytesperclust;
 348         endclust=curclust;
 349         do {
 350                 /* search for consecutive clusters */
 351                 while(actsize < filesize) {
 352                         newclust = get_fatent(mydata, endclust);
 353                         if((newclust -1)!=endclust)
 354                                 goto getit;
 355                         if (CHECK_CLUST(newclust, mydata->fatsize)) {
 356                                 FAT_DPRINT("curclust: 0x%x\n", newclust);
 357                                 FAT_DPRINT("Invalid FAT entry\n");
 358                                 return gotsize;
 359                         }
 360                         endclust=newclust;
 361                         actsize+= bytesperclust;
 362                 }
 363                 /* actsize >= file size */
 364                 actsize -= bytesperclust;
 365                 /* get remaining clusters */
 366                 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
 367                         FAT_ERROR("Error reading cluster\n");
 368                         return -1;
 369                 }
 370                 /* get remaining bytes */
 371                 gotsize += (int)actsize;
 372                 filesize -= actsize;
 373                 buffer += actsize;
 374                 actsize= filesize;
 375                 if (get_cluster(mydata, endclust, buffer, (int)actsize) != 0) {
 376                         FAT_ERROR("Error reading cluster\n");
 377                         return -1;
 378                 }
 379                 gotsize+=actsize;
 380                 return gotsize;
 381 getit:
 382                 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
 383                         FAT_ERROR("Error reading cluster\n");
 384                         return -1;
 385                 }
 386                 gotsize += (int)actsize;
 387                 filesize -= actsize;
 388                 buffer += actsize;
 389                 curclust = get_fatent(mydata, endclust);
 390                 if (CHECK_CLUST(curclust, mydata->fatsize)) {
 391                         FAT_DPRINT("curclust: 0x%x\n", curclust);
 392                         FAT_ERROR("Invalid FAT entry\n");
 393                         return gotsize;
 394                 }
 395                 actsize=bytesperclust;
 396                 endclust=curclust;
 397         } while (1);
 398 }
 399
 400
 401 #ifdef CONFIG_SUPPORT_VFAT
 402 /*
 403  * Extract the file name information from 'slotptr' into 'l_name',
 404  * starting at l_name[*idx].
 405  * Return 1 if terminator (zero byte) is found, 0 otherwise.
 406  */
 407 static int
 408 slot2str(dir_slot *slotptr, char *l_name, int *idx)
 409 {
 410         int j;
 411
 412         for (j = 0; j <= 8; j += 2) {
 413                 l_name[*idx] = slotptr->name0_4[j];
 414                 if (l_name[*idx] == 0x00) return 1;
 415                 (*idx)++;
 416         }
 417         for (j = 0; j <= 10; j += 2) {
 418                 l_name[*idx] = slotptr->name5_10[j];
 419                 if (l_name[*idx] == 0x00) return 1;
 420                 (*idx)++;
 421         }
 422         for (j = 0; j <= 2; j += 2) {
 423                 l_name[*idx] = slotptr->name11_12[j];
 424                 if (l_name[*idx] == 0x00) return 1;
 425                 (*idx)++;
 426         }
 427
 428         return 0;
 429 }
 430
 431
 432 /*
 433  * Extract the full long filename starting at 'retdent' (which is really
 434  * a slot) into 'l_name'. If successful also copy the real directory entry
 435  * into 'retdent'
 436  * Return 0 on success, -1 otherwise.
 437  */
 438 __u8     get_vfatname_block[MAX_CLUSTSIZE];
 439 static int
 440 get_vfatname(fsdata *mydata, int curclust, __u8 *cluster,
 441              dir_entry *retdent, char *l_name)
 442 {
 443         dir_entry *realdent;
 444         dir_slot  *slotptr = (dir_slot*) retdent;
 445         __u8      *nextclust = cluster + mydata->clust_size * SECTOR_SIZE;
 446         __u8       counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff;
 447         int idx = 0;
 448
 449         while ((__u8*)slotptr < nextclust) {
 450                 if (counter == 0) break;
 451                 if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter)
 452                         return -1;
 453                 slotptr++;
 454                 counter--;
 455         }
 456
 457         if ((__u8*)slotptr >= nextclust) {
 458                 dir_slot *slotptr2;
 459
 460                 slotptr--;
 461                 curclust = get_fatent(mydata, curclust);
 462                 if (CHECK_CLUST(curclust, mydata->fatsize)) {
 463                         FAT_DPRINT("curclust: 0x%x\n", curclust);
 464                         FAT_ERROR("Invalid FAT entry\n");
 465                         return -1;
 466                 }
 467                 if (get_cluster(mydata, curclust, get_vfatname_block,
 468                                 mydata->clust_size * SECTOR_SIZE) != 0) {
 469                         FAT_DPRINT("Error: reading directory block\n");
 470                         return -1;
 471                 }
 472                 slotptr2 = (dir_slot*) get_vfatname_block;
 473                 while (slotptr2->id > 0x01) {
 474                         slotptr2++;
 475                 }
 476                 /* Save the real directory entry */
 477                 realdent = (dir_entry*)slotptr2 + 1;
 478                 while ((__u8*)slotptr2 >= get_vfatname_block) {
 479                         slot2str(slotptr2, l_name, &idx);
 480                         slotptr2--;
 481                 }
 482         } else {
 483                 /* Save the real directory entry */
 484                 realdent = (dir_entry*)slotptr;
 485         }
 486
 487         do {
 488                 slotptr--;
 489                 if (slot2str(slotptr, l_name, &idx)) break;
 490         } while (!(slotptr->id & LAST_LONG_ENTRY_MASK));
 491
 492         l_name[idx] = '\0';
 493         if (*l_name == DELETED_FLAG) *l_name = '\0';
 494         else if (*l_name == aRING) *l_name = 'å';
 495         downcase(l_name);
 496
 497         /* Return the real directory entry */
 498         memcpy(retdent, realdent, sizeof(dir_entry));
 499
 500         return 0;
 501 }
 502
 503
 504 /* Calculate short name checksum */
 505 static __u8
 506 mkcksum(const char *str)
 507 {
 508         int i;
 509         __u8 ret = 0;
 510
 511         for (i = 0; i < 11; i++) {
 512                 ret = (((ret&1)<<7)|((ret&0xfe)>>1)) + str[i];
 513         }
 514
 515         return ret;
 516 }
 517 #endif
 518
 519
 520 /*
 521  * Get the directory entry associated with 'filename' from the directory
 522  * starting at 'startsect'
 523  */
 524 __u8 get_dentfromdir_block[MAX_CLUSTSIZE];
 525 static dir_entry *get_dentfromdir (fsdata * mydata, int startsect,
 526                                    char *filename, dir_entry * retdent,
 527                                    int dols)
 528 {
 529     __u16 prevcksum = 0xffff;
 530     __u32 curclust = START (retdent);
 531     int files = 0, dirs = 0;
 532
 533     FAT_DPRINT ("get_dentfromdir: %s\n", filename);
 534     while (1) {
 535         dir_entry *dentptr;
 536         int i;
 537
 538         if (get_cluster (mydata, curclust, get_dentfromdir_block,
 539                  mydata->clust_size * SECTOR_SIZE) != 0) {
 540             FAT_DPRINT ("Error: reading directory block\n");
 541             return NULL;
 542         }
 543         dentptr = (dir_entry *) get_dentfromdir_block;
 544         for (i = 0; i < DIRENTSPERCLUST; i++) {
 545             char s_name[14], l_name[256];
 546
 547             l_name[0] = '\0';
 548             if (dentptr->name[0] == DELETED_FLAG) {
 549                     dentptr++;
 550                     continue;
 551             }
 552             if ((dentptr->attr & ATTR_VOLUME)) {
 553 #ifdef CONFIG_SUPPORT_VFAT
 554                 if ((dentptr->attr & ATTR_VFAT) &&
 555                     (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
 556                     prevcksum = ((dir_slot *) dentptr)
 557                             ->alias_checksum;
 558                     get_vfatname (mydata, curclust, get_dentfromdir_block,
 559                                   dentptr, l_name);
 560                     if (dols) {
 561                         int isdir = (dentptr->attr & ATTR_DIR);
 562                         char dirc;
 563                         int doit = 0;
 564
 565                         if (isdir) {
 566                             dirs++;
 567                             dirc = '/';
 568                             doit = 1;
 569                         } else {
 570                             dirc = ' ';
 571                             if (l_name[0] != 0) {
 572                                 files++;
 573                                 doit = 1;
 574                             }
 575                         }
 576                         if (doit) {
 577                             if (dirc == ' ') {
 578                                 printf (" %8ld   %s%c\n",
 579                                         (long) FAT2CPU32 (dentptr->size),
 580                                         l_name, dirc);
 581                             } else {
 582                                 printf ("            %s%c\n", l_name, dirc);
 583                             }
 584                         }
 585                         dentptr++;
 586                         continue;
 587                     }
 588                     FAT_DPRINT ("vfatname: |%s|\n", l_name);
 589                 } else
 590 #endif
 591                 {
 592                     /* Volume label or VFAT entry */
 593                     dentptr++;
 594                     continue;
 595                 }
 596             }
 597             if (dentptr->name[0] == 0) {
 598                 if (dols) {
 599                     printf ("\n%d file(s), %d dir(s)\n\n", files, dirs);
 600                 }
 601                 FAT_DPRINT ("Dentname == NULL - %d\n", i);
 602                 return NULL;
 603             }
 604 #ifdef CONFIG_SUPPORT_VFAT
 605             if (dols && mkcksum (dentptr->name) == prevcksum) {
 606                 dentptr++;
 607                 continue;
 608             }
 609 #endif
 610             get_name (dentptr, s_name);
 611             if (dols) {
 612                 int isdir = (dentptr->attr & ATTR_DIR);
 613                 char dirc;
 614                 int doit = 0;
 615
 616                 if (isdir) {
 617                     dirs++;
 618                     dirc = '/';
 619                     doit = 1;
 620                 } else {
 621                     dirc = ' ';
 622                     if (s_name[0] != 0) {
 623                         files++;
 624                         doit = 1;
 625                     }
 626                 }
 627                 if (doit) {
 628                     if (dirc == ' ') {
 629                         printf (" %8ld   %s%c\n",
 630                                 (long) FAT2CPU32 (dentptr->size), s_name,
 631                                 dirc);
 632                     } else {
 633                         printf ("            %s%c\n", s_name, dirc);
 634                     }
 635                 }
 636                 dentptr++;
 637                 continue;
 638             }
 639             if (strcmp (filename, s_name) && strcmp (filename, l_name)) {
 640                 FAT_DPRINT ("Mismatch: |%s|%s|\n", s_name, l_name);
 641                 dentptr++;
 642                 continue;
 643             }
 644             memcpy (retdent, dentptr, sizeof (dir_entry));
 645
 646             FAT_DPRINT ("DentName: %s", s_name);
 647             FAT_DPRINT (", start: 0x%x", START (dentptr));
 648             FAT_DPRINT (", size:  0x%x %s\n",
 649                         FAT2CPU32 (dentptr->size),
 650                         (dentptr->attr & ATTR_DIR) ? "(DIR)" : "");
 651
 652             return retdent;
 653         }
 654         curclust = get_fatent (mydata, curclust);
 655         if (CHECK_CLUST(curclust, mydata->fatsize)) {
 656             FAT_DPRINT ("curclust: 0x%x\n", curclust);
 657             FAT_ERROR ("Invalid FAT entry\n");
 658             return NULL;
 659         }
 660     }
 661
 662     return NULL;
 663 }
 664
 665
 666 /*
 667  * Read boot sector and volume info from a FAT filesystem
 668  */
 669 static int
 670 read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize)
 671 {
 672         __u8 block[FS_BLOCK_SIZE];
 673         volume_info *vistart;
 674
 675         if (disk_read(0, 1, block) < 0) {
 676                 FAT_DPRINT("Error: reading block\n");
 677                 return -1;
 678         }
 679
 680         memcpy(bs, block, sizeof(boot_sector));
 681         bs->reserved    = FAT2CPU16(bs->reserved);
 682         bs->fat_length  = FAT2CPU16(bs->fat_length);
 683         bs->secs_track  = FAT2CPU16(bs->secs_track);
 684         bs->heads       = FAT2CPU16(bs->heads);
 685 #if 0 /* UNUSED */
 686         bs->hidden      = FAT2CPU32(bs->hidden);
 687 #endif
 688         bs->total_sect  = FAT2CPU32(bs->total_sect);
 689
 690         /* FAT32 entries */
 691         if (bs->fat_length == 0) {
 692                 /* Assume FAT32 */
 693                 bs->fat32_length = FAT2CPU32(bs->fat32_length);
 694                 bs->flags        = FAT2CPU16(bs->flags);
 695                 bs->root_cluster = FAT2CPU32(bs->root_cluster);
 696                 bs->info_sector  = FAT2CPU16(bs->info_sector);
 697                 bs->backup_boot  = FAT2CPU16(bs->backup_boot);
 698                 vistart = (volume_info*) (block + sizeof(boot_sector));
 699                 *fatsize = 32;
 700         } else {
 701                 vistart = (volume_info*) &(bs->fat32_length);
 702                 *fatsize = 0;
 703         }
 704         memcpy(volinfo, vistart, sizeof(volume_info));
 705
 706         /* Terminate fs_type string. Writing past the end of vistart
 707            is ok - it's just the buffer. */
 708         vistart->fs_type[8] = '\0';
 709
 710         if (*fatsize == 32) {
 711                 if (compare_sign(FAT32_SIGN, vistart->fs_type) == 0) {
 712                         return 0;
 713                 }
 714         } else {
 715                 if (compare_sign(FAT12_SIGN, vistart->fs_type) == 0) {
 716                         *fatsize = 12;
 717                         return 0;
 718                 }
 719                 if (compare_sign(FAT16_SIGN, vistart->fs_type) == 0) {
 720                         *fatsize = 16;
 721                         return 0;
 722                 }
 723         }
 724
 725         FAT_DPRINT("Error: broken fs_type sign\n");
 726         return -1;
 727 }
 728
 729
 730 __u8 do_fat_read_block[MAX_CLUSTSIZE];  /* Block buffer */
 731 long
 732 do_fat_read (const char *filename, void *buffer, unsigned long maxsize,
 733              int dols)
 734 {
 735 #if CONFIG_NIOS /* NIOS CPU cannot access big automatic arrays */
 736     static
 737 #endif
 738     char fnamecopy[2048];
 739     boot_sector bs;
 740     volume_info volinfo;
 741     fsdata datablock;
 742     fsdata *mydata = &datablock;
 743     dir_entry *dentptr;
 744     __u16 prevcksum = 0xffff;
 745     char *subname = "";
 746     int rootdir_size, cursect;
 747     int idx, isdir = 0;
 748     int files = 0, dirs = 0;
 749     long ret = 0;
 750     int firsttime;
 751
 752     if (read_bootsectandvi (&bs, &volinfo, &mydata->fatsize)) {
 753         FAT_DPRINT ("Error: reading boot sector\n");
 754         return -1;
 755     }
 756     if (mydata->fatsize == 32) {
 757         mydata->fatlength = bs.fat32_length;
 758     } else {
 759         mydata->fatlength = bs.fat_length;
 760     }
 761     mydata->fat_sect = bs.reserved;
 762     cursect = mydata->rootdir_sect
 763             = mydata->fat_sect + mydata->fatlength * bs.fats;
 764     mydata->clust_size = bs.cluster_size;
 765     if (mydata->fatsize == 32) {
 766         rootdir_size = mydata->clust_size;
 767         mydata->data_begin = mydata->rootdir_sect   /* + rootdir_size */
 768                 - (mydata->clust_size * 2);
 769     } else {
 770         rootdir_size = ((bs.dir_entries[1] * (int) 256 + bs.dir_entries[0])
 771                         * sizeof (dir_entry)) / SECTOR_SIZE;
 772         mydata->data_begin = mydata->rootdir_sect + rootdir_size
 773                 - (mydata->clust_size * 2);
 774     }
 775     mydata->fatbufnum = -1;
 776
 777     FAT_DPRINT ("FAT%d, fatlength: %d\n", mydata->fatsize,
 778                 mydata->fatlength);
 779     FAT_DPRINT ("Rootdir begins at sector: %d, offset: %x, size: %d\n"
 780                 "Data begins at: %d\n",
 781                 mydata->rootdir_sect, mydata->rootdir_sect * SECTOR_SIZE,
 782                 rootdir_size, mydata->data_begin);
 783     FAT_DPRINT ("Cluster size: %d\n", mydata->clust_size);
 784
 785     /* "cwd" is always the root... */
 786     while (ISDIRDELIM (*filename))
 787         filename++;
 788     /* Make a copy of the filename and convert it to lowercase */
 789     strcpy (fnamecopy, filename);
 790     downcase (fnamecopy);
 791     if (*fnamecopy == '\0') {
 792         if (!dols)
 793             return -1;
 794         dols = LS_ROOT;
 795     } else if ((idx = dirdelim (fnamecopy)) >= 0) {
 796         isdir = 1;
 797         fnamecopy[idx] = '\0';
 798         subname = fnamecopy + idx + 1;
 799         /* Handle multiple delimiters */
 800         while (ISDIRDELIM (*subname))
 801             subname++;
 802     } else if (dols) {
 803         isdir = 1;
 804     }
 805
 806     while (1) {
 807         int i;
 808
 809         if (disk_read (cursect, mydata->clust_size, do_fat_read_block) < 0) {
 810             FAT_DPRINT ("Error: reading rootdir block\n");
 811             return -1;
 812         }
 813         dentptr = (dir_entry *) do_fat_read_block;
 814         for (i = 0; i < DIRENTSPERBLOCK; i++) {
 815             char s_name[14], l_name[256];
 816
 817             l_name[0] = '\0';
 818             if ((dentptr->attr & ATTR_VOLUME)) {
 819 #ifdef CONFIG_SUPPORT_VFAT
 820                 if ((dentptr->attr & ATTR_VFAT) &&
 821                     (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
 822                     prevcksum = ((dir_slot *) dentptr)->alias_checksum;
 823                     get_vfatname (mydata, 0, do_fat_read_block, dentptr, l_name);
 824                     if (dols == LS_ROOT) {
 825                         int isdir = (dentptr->attr & ATTR_DIR);
 826                         char dirc;
 827                         int doit = 0;
 828
 829                         if (isdir) {
 830                             dirs++;
 831                             dirc = '/';
 832                             doit = 1;
 833                         } else {
 834                             dirc = ' ';
 835                             if (l_name[0] != 0) {
 836                                 files++;
 837                                 doit = 1;
 838                             }
 839                         }
 840                         if (doit) {
 841                             if (dirc == ' ') {
 842                                 printf (" %8ld   %s%c\n",
 843                                         (long) FAT2CPU32 (dentptr->size),
 844                                         l_name, dirc);
 845                             } else {
 846                                 printf ("            %s%c\n", l_name, dirc);
 847                             }
 848                         }
 849                         dentptr++;
 850                         continue;
 851                     }
 852                     FAT_DPRINT ("Rootvfatname: |%s|\n", l_name);
 853                 } else
 854 #endif
 855                 {
 856                     /* Volume label or VFAT entry */
 857                     dentptr++;
 858                     continue;
 859                 }
 860             } else if (dentptr->name[0] == 0) {
 861                 FAT_DPRINT ("RootDentname == NULL - %d\n", i);
 862                 if (dols == LS_ROOT) {
 863                     printf ("\n%d file(s), %d dir(s)\n\n", files, dirs);
 864                     return 0;
 865                 }
 866                 return -1;
 867             }
 868 #ifdef CONFIG_SUPPORT_VFAT
 869             else if (dols == LS_ROOT
 870                      && mkcksum (dentptr->name) == prevcksum) {
 871                 dentptr++;
 872                 continue;
 873             }
 874 #endif
 875             get_name (dentptr, s_name);
 876             if (dols == LS_ROOT) {
 877                 int isdir = (dentptr->attr & ATTR_DIR);
 878                 char dirc;
 879                 int doit = 0;
 880
 881                 if (isdir) {
 882                     dirc = '/';
 883                     if (s_name[0] != 0) {
 884                         dirs++;
 885                         doit = 1;
 886                     }
 887                 } else {
 888                     dirc = ' ';
 889                     if (s_name[0] != 0) {
 890                         files++;
 891                         doit = 1;
 892                     }
 893                 }
 894                 if (doit) {
 895                     if (dirc == ' ') {
 896                         printf (" %8ld   %s%c\n",
 897                                 (long) FAT2CPU32 (dentptr->size), s_name,
 898                                 dirc);
 899                     } else {
 900                         printf ("            %s%c\n", s_name, dirc);
 901                     }
 902                 }
 903                 dentptr++;
 904                 continue;
 905             }
 906             if (strcmp (fnamecopy, s_name) && strcmp (fnamecopy, l_name)) {
 907                 FAT_DPRINT ("RootMismatch: |%s|%s|\n", s_name, l_name);
 908                 dentptr++;
 909                 continue;
 910             }
 911             if (isdir && !(dentptr->attr & ATTR_DIR))
 912                 return -1;
 913
 914             FAT_DPRINT ("RootName: %s", s_name);
 915             FAT_DPRINT (", start: 0x%x", START (dentptr));
 916             FAT_DPRINT (", size:  0x%x %s\n",
 917                         FAT2CPU32 (dentptr->size), isdir ? "(DIR)" : "");
 918
 919             goto rootdir_done;  /* We got a match */
 920         }
 921         cursect++;
 922     }
 923   rootdir_done:
 924
 925     firsttime = 1;
 926     while (isdir) {
 927         int startsect = mydata->data_begin
 928                 + START (dentptr) * mydata->clust_size;
 929         dir_entry dent;
 930         char *nextname = NULL;
 931
 932         dent = *dentptr;
 933         dentptr = &dent;
 934
 935         idx = dirdelim (subname);
 936         if (idx >= 0) {
 937             subname[idx] = '\0';
 938             nextname = subname + idx + 1;
 939             /* Handle multiple delimiters */
 940             while (ISDIRDELIM (*nextname))
 941                 nextname++;
 942             if (dols && *nextname == '\0')
 943                 firsttime = 0;
 944         } else {
 945             if (dols && firsttime) {
 946                 firsttime = 0;
 947             } else {
 948                 isdir = 0;
 949             }
 950         }
 951
 952         if (get_dentfromdir (mydata, startsect, subname, dentptr,
 953                              isdir ? 0 : dols) == NULL) {
 954             if (dols && !isdir)
 955                 return 0;
 956             return -1;
 957         }
 958
 959         if (idx >= 0) {
 960             if (!(dentptr->attr & ATTR_DIR))
 961                 return -1;
 962             subname = nextname;
 963         }
 964     }
 965     ret = get_contents (mydata, dentptr, buffer, maxsize);
 966     FAT_DPRINT ("Size: %d, got: %ld\n", FAT2CPU32 (dentptr->size), ret);
 967
 968     return ret;
 969 }
 970
 971
 972 int
 973 file_fat_detectfs(void)
 974 {
 975         boot_sector     bs;
 976         volume_info     volinfo;
 977         int             fatsize;
 978         char    vol_label[12];
 979
 980         if(cur_dev==NULL) {
 981                 printf("No current device\n");
 982                 return 1;
 983         }
 984 #if defined(CONFIG_CMD_IDE) || \
 985     defined(CONFIG_CMD_SCSI) || \
 986     defined(CONFIG_CMD_USB) || \
 987     defined(CONFIG_MMC)
 988         printf("Interface:  ");
 989         switch(cur_dev->if_type) {
 990                 case IF_TYPE_IDE :      printf("IDE"); break;
 991                 case IF_TYPE_SCSI :     printf("SCSI"); break;
 992                 case IF_TYPE_ATAPI :    printf("ATAPI"); break;
 993                 case IF_TYPE_USB :      printf("USB"); break;
 994                 case IF_TYPE_DOC :      printf("DOC"); break;
 995                 case IF_TYPE_MMC :      printf("MMC"); break;
 996                 default :               printf("Unknown");
 997         }
 998         printf("\n  Device %d: ",cur_dev->dev);
 999         dev_print(cur_dev);
1000 #endif
1001         if(read_bootsectandvi(&bs, &volinfo, &fatsize)) {
1002                 printf("\nNo valid FAT fs found\n");
1003                 return 1;
1004         }
1005         memcpy (vol_label, volinfo.volume_label, 11);
1006         vol_label[11] = '\0';
1007         volinfo.fs_type[5]='\0';
1008         printf("Partition %d: Filesystem: %s \"%s\"\n"
1009                         ,cur_part,volinfo.fs_type,vol_label);
1010         return 0;
1011 }
1012
1013
1014 int
1015 file_fat_ls(const char *dir)
1016 {
1017         return do_fat_read(dir, NULL, 0, LS_YES);
1018 }
1019
1020
1021 long
1022 file_fat_read(const char *filename, void *buffer, unsigned long maxsize)
1023 {
1024         printf("reading %s\n",filename);
1025         return do_fat_read(filename, buffer, maxsize, LS_NO);
1026 }
1027
1028 #endif