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(!strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET],"FAT",3)) {
  89                 /* ok, we assume we are on a PBR only */
  90                 cur_part = 1;
  91                 part_offset=0;
  92         }
  93         else {
  94 #if (defined(CONFIG_CMD_IDE) || \
  95      defined(CONFIG_CMD_SCSI) || \
  96      defined(CONFIG_CMD_USB) || \
  97      (defined(CONFIG_MMC) && defined(CONFIG_LPC2292)) || \
  98      defined(CONFIG_SYSTEMACE)          )
  99         /* First we assume, there is a MBR */
 100         if (!get_partition_info (dev_desc, part_no, &info)) {
 101                 part_offset = info.start;
 102                 cur_part = part_no;
 103         } else if (!strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET], "FAT", 3)) {
 104                 /* ok, we assume we are on a PBR only */
 105                 cur_part = 1;
 106                 part_offset = 0;
 107         } else {
 108                 printf ("** Partition %d not valid on device %d **\n", part_no, dev_desc->dev);
 109                 return -1;
 110         }
 111 #else
 112         if(!strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET],"FAT",3)) {
 113                 /* ok, we assume we are on a PBR only */
 114                 cur_part = 1;
 115                 part_offset = 0;
 116                 info.start = part_offset;
 117         } else {
 118                 /* FIXME we need to determine the start block of the
 119                  * partition where the DOS FS resides. This can be done
 120                  * by using the get_partition_info routine. For this
 121                  * purpose the libpart must be included.
 122                  */
 123                 part_offset = 32;
 124                 cur_part = 1;
 125         }
 126 #endif
 127         return 0;
 128 }
 129
 130
 131 /*
 132  * Get the first occurence of a directory delimiter ('/' or '\') in a string.
 133  * Return index into string if found, -1 otherwise.
 134  */
 135 static int
 136 dirdelim(char *str)
 137 {
 138         char *start = str;
 139
 140         while (*str != '\0') {
 141                 if (ISDIRDELIM(*str)) return str - start;
 142                 str++;
 143         }
 144         return -1;
 145 }
 146
 147
 148 /*
 149  * Match volume_info fs_type strings.
 150  * Return 0 on match, -1 otherwise.
 151  */
 152 static int
 153 compare_sign(char *str1, char *str2)
 154 {
 155         char *end = str1+SIGNLEN;
 156
 157         while (str1 != end) {
 158                 if (*str1 != *str2) {
 159                         return -1;
 160                 }
 161                 str1++;
 162                 str2++;
 163         }
 164
 165         return 0;
 166 }
 167
 168
 169 /*
 170  * Extract zero terminated short name from a directory entry.
 171  */
 172 static void get_name (dir_entry *dirent, char *s_name)
 173 {
 174         char *ptr;
 175
 176         memcpy (s_name, dirent->name, 8);
 177         s_name[8] = '\0';
 178         ptr = s_name;
 179         while (*ptr && *ptr != ' ')
 180                 ptr++;
 181         if (dirent->ext[0] && dirent->ext[0] != ' ') {
 182                 *ptr = '.';
 183                 ptr++;
 184                 memcpy (ptr, dirent->ext, 3);
 185                 ptr[3] = '\0';
 186                 while (*ptr && *ptr != ' ')
 187                         ptr++;
 188         }
 189         *ptr = '\0';
 190         if (*s_name == DELETED_FLAG)
 191                 *s_name = '\0';
 192         else if (*s_name == aRING)
 193                 *s_name = 'å';
 194         downcase (s_name);
 195 }
 196
 197 /*
 198  * Get the entry at index 'entry' in a FAT (12/16/32) table.
 199  * On failure 0x00 is returned.
 200  */
 201 static __u32
 202 get_fatent(fsdata *mydata, __u32 entry)
 203 {
 204         __u32 bufnum;
 205         __u32 offset;
 206         __u32 ret = 0x00;
 207
 208         switch (mydata->fatsize) {
 209         case 32:
 210                 bufnum = entry / FAT32BUFSIZE;
 211                 offset = entry - bufnum * FAT32BUFSIZE;
 212                 break;
 213         case 16:
 214                 bufnum = entry / FAT16BUFSIZE;
 215                 offset = entry - bufnum * FAT16BUFSIZE;
 216                 break;
 217         case 12:
 218                 bufnum = entry / FAT12BUFSIZE;
 219                 offset = entry - bufnum * FAT12BUFSIZE;
 220                 break;
 221
 222         default:
 223                 /* Unsupported FAT size */
 224                 return ret;
 225         }
 226
 227         /* Read a new block of FAT entries into the cache. */
 228         if (bufnum != mydata->fatbufnum) {
 229                 int getsize = FATBUFSIZE/FS_BLOCK_SIZE;
 230                 __u8 *bufptr = mydata->fatbuf;
 231                 __u32 fatlength = mydata->fatlength;
 232                 __u32 startblock = bufnum * FATBUFBLOCKS;
 233
 234                 fatlength *= SECTOR_SIZE;       /* We want it in bytes now */
 235                 startblock += mydata->fat_sect; /* Offset from start of disk */
 236
 237                 if (getsize > fatlength) getsize = fatlength;
 238                 if (disk_read(startblock, getsize, bufptr) < 0) {
 239                         FAT_DPRINT("Error reading FAT blocks\n");
 240                         return ret;
 241                 }
 242                 mydata->fatbufnum = bufnum;
 243         }
 244
 245         /* Get the actual entry from the table */
 246         switch (mydata->fatsize) {
 247         case 32:
 248                 ret = FAT2CPU32(((__u32*)mydata->fatbuf)[offset]);
 249                 break;
 250         case 16:
 251                 ret = FAT2CPU16(((__u16*)mydata->fatbuf)[offset]);
 252                 break;
 253         case 12: {
 254                 __u32 off16 = (offset*3)/4;
 255                 __u16 val1, val2;
 256
 257                 switch (offset & 0x3) {
 258                 case 0:
 259                         ret = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);
 260                         ret &= 0xfff;
 261                         break;
 262                 case 1:
 263                         val1 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);
 264                         val1 &= 0xf000;
 265                         val2 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16+1]);
 266                         val2 &= 0x00ff;
 267                         ret = (val2 << 4) | (val1 >> 12);
 268                         break;
 269                 case 2:
 270                         val1 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);
 271                         val1 &= 0xff00;
 272                         val2 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16+1]);
 273                         val2 &= 0x000f;
 274                         ret = (val2 << 8) | (val1 >> 8);
 275                         break;
 276                 case 3:
 277                         ret = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);;
 278                         ret = (ret & 0xfff0) >> 4;
 279                         break;
 280                 default:
 281                         break;
 282                 }
 283         }
 284         break;
 285         }
 286         FAT_DPRINT("ret: %d, offset: %d\n", ret, offset);
 287
 288         return ret;
 289 }
 290
 291
 292 /*
 293  * Read at most 'size' bytes from the specified cluster into 'buffer'.
 294  * Return 0 on success, -1 otherwise.
 295  */
 296 static int
 297 get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size)
 298 {
 299         int idx = 0;
 300         __u32 startsect;
 301
 302         if (clustnum > 0) {
 303                 startsect = mydata->data_begin + clustnum*mydata->clust_size;
 304         } else {
 305                 startsect = mydata->rootdir_sect;
 306         }
 307
 308         FAT_DPRINT("gc - clustnum: %d, startsect: %d\n", clustnum, startsect);
 309         if (disk_read(startsect, size/FS_BLOCK_SIZE , buffer) < 0) {
 310                 FAT_DPRINT("Error reading data\n");
 311                 return -1;
 312         }
 313         if(size % FS_BLOCK_SIZE) {
 314                 __u8 tmpbuf[FS_BLOCK_SIZE];
 315                 idx= size/FS_BLOCK_SIZE;
 316                 if (disk_read(startsect + idx, 1, tmpbuf) < 0) {
 317                         FAT_DPRINT("Error reading data\n");
 318                         return -1;
 319                 }
 320                 buffer += idx*FS_BLOCK_SIZE;
 321
 322                 memcpy(buffer, tmpbuf, size % FS_BLOCK_SIZE);
 323                 return 0;
 324         }
 325
 326         return 0;
 327 }
 328
 329
 330 /*
 331  * Read at most 'maxsize' bytes from the file associated with 'dentptr'
 332  * into 'buffer'.
 333  * Return the number of bytes read or -1 on fatal errors.
 334  */
 335 static long
 336 get_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer,
 337              unsigned long maxsize)
 338 {
 339         unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0;
 340         unsigned int bytesperclust = mydata->clust_size * SECTOR_SIZE;
 341         __u32 curclust = START(dentptr);
 342         __u32 endclust, newclust;
 343         unsigned long actsize;
 344
 345         FAT_DPRINT("Filesize: %ld bytes\n", filesize);
 346
 347         if (maxsize > 0 && filesize > maxsize) filesize = maxsize;
 348
 349         FAT_DPRINT("Reading: %ld bytes\n", filesize);
 350
 351         actsize=bytesperclust;
 352         endclust=curclust;
 353         do {
 354                 /* search for consecutive clusters */
 355                 while(actsize < filesize) {
 356                         newclust = get_fatent(mydata, endclust);
 357                         if((newclust -1)!=endclust)
 358                                 goto getit;
 359                         if (newclust <= 0x0001 || newclust >= 0xfff0) {
 360                                 FAT_DPRINT("curclust: 0x%x\n", newclust);
 361                                 FAT_DPRINT("Invalid FAT entry\n");
 362                                 return gotsize;
 363                         }
 364                         endclust=newclust;
 365                         actsize+= bytesperclust;
 366                 }
 367                 /* actsize >= file size */
 368                 actsize -= bytesperclust;
 369                 /* get remaining clusters */
 370                 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
 371                         FAT_ERROR("Error reading cluster\n");
 372                         return -1;
 373                 }
 374                 /* get remaining bytes */
 375                 gotsize += (int)actsize;
 376                 filesize -= actsize;
 377                 buffer += actsize;
 378                 actsize= filesize;
 379                 if (get_cluster(mydata, endclust, buffer, (int)actsize) != 0) {
 380                         FAT_ERROR("Error reading cluster\n");
 381                         return -1;
 382                 }
 383                 gotsize+=actsize;
 384                 return gotsize;
 385 getit:
 386                 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
 387                         FAT_ERROR("Error reading cluster\n");
 388                         return -1;
 389                 }
 390                 gotsize += (int)actsize;
 391                 filesize -= actsize;
 392                 buffer += actsize;
 393                 curclust = get_fatent(mydata, endclust);
 394                 if (curclust <= 0x0001 || curclust >= 0xfff0) {
 395                         FAT_DPRINT("curclust: 0x%x\n", curclust);
 396                         FAT_ERROR("Invalid FAT entry\n");
 397                         return gotsize;
 398                 }
 399                 actsize=bytesperclust;
 400                 endclust=curclust;
 401         } while (1);
 402 }
 403
 404
 405 #ifdef CONFIG_SUPPORT_VFAT
 406 /*
 407  * Extract the file name information from 'slotptr' into 'l_name',
 408  * starting at l_name[*idx].
 409  * Return 1 if terminator (zero byte) is found, 0 otherwise.
 410  */
 411 static int
 412 slot2str(dir_slot *slotptr, char *l_name, int *idx)
 413 {
 414         int j;
 415
 416         for (j = 0; j <= 8; j += 2) {
 417                 l_name[*idx] = slotptr->name0_4[j];
 418                 if (l_name[*idx] == 0x00) return 1;
 419                 (*idx)++;
 420         }
 421         for (j = 0; j <= 10; j += 2) {
 422                 l_name[*idx] = slotptr->name5_10[j];
 423                 if (l_name[*idx] == 0x00) return 1;
 424                 (*idx)++;
 425         }
 426         for (j = 0; j <= 2; j += 2) {
 427                 l_name[*idx] = slotptr->name11_12[j];
 428                 if (l_name[*idx] == 0x00) return 1;
 429                 (*idx)++;
 430         }
 431
 432         return 0;
 433 }
 434
 435
 436 /*
 437  * Extract the full long filename starting at 'retdent' (which is really
 438  * a slot) into 'l_name'. If successful also copy the real directory entry
 439  * into 'retdent'
 440  * Return 0 on success, -1 otherwise.
 441  */
 442 __u8     get_vfatname_block[MAX_CLUSTSIZE];
 443 static int
 444 get_vfatname(fsdata *mydata, int curclust, __u8 *cluster,
 445              dir_entry *retdent, char *l_name)
 446 {
 447         dir_entry *realdent;
 448         dir_slot  *slotptr = (dir_slot*) retdent;
 449         __u8      *nextclust = cluster + mydata->clust_size * SECTOR_SIZE;
 450         __u8       counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff;
 451         int idx = 0;
 452
 453         while ((__u8*)slotptr < nextclust) {
 454                 if (counter == 0) break;
 455                 if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter)
 456                         return -1;
 457                 slotptr++;
 458                 counter--;
 459         }
 460
 461         if ((__u8*)slotptr >= nextclust) {
 462                 dir_slot *slotptr2;
 463
 464                 slotptr--;
 465                 curclust = get_fatent(mydata, curclust);
 466                 if (curclust <= 0x0001 || curclust >= 0xfff0) {
 467                         FAT_DPRINT("curclust: 0x%x\n", curclust);
 468                         FAT_ERROR("Invalid FAT entry\n");
 469                         return -1;
 470                 }
 471                 if (get_cluster(mydata, curclust, get_vfatname_block,
 472                                 mydata->clust_size * SECTOR_SIZE) != 0) {
 473                         FAT_DPRINT("Error: reading directory block\n");
 474                         return -1;
 475                 }
 476                 slotptr2 = (dir_slot*) get_vfatname_block;
 477                 while (slotptr2->id > 0x01) {
 478                         slotptr2++;
 479                 }
 480                 /* Save the real directory entry */
 481                 realdent = (dir_entry*)slotptr2 + 1;
 482                 while ((__u8*)slotptr2 >= get_vfatname_block) {
 483                         slot2str(slotptr2, l_name, &idx);
 484                         slotptr2--;
 485                 }
 486         } else {
 487                 /* Save the real directory entry */
 488                 realdent = (dir_entry*)slotptr;
 489         }
 490
 491         do {
 492                 slotptr--;
 493                 if (slot2str(slotptr, l_name, &idx)) break;
 494         } while (!(slotptr->id & LAST_LONG_ENTRY_MASK));
 495
 496         l_name[idx] = '\0';
 497         if (*l_name == DELETED_FLAG) *l_name = '\0';
 498         else if (*l_name == aRING) *l_name = 'å';
 499         downcase(l_name);
 500
 501         /* Return the real directory entry */
 502         memcpy(retdent, realdent, sizeof(dir_entry));
 503
 504         return 0;
 505 }
 506
 507
 508 /* Calculate short name checksum */
 509 static __u8
 510 mkcksum(const char *str)
 511 {
 512         int i;
 513         __u8 ret = 0;
 514
 515         for (i = 0; i < 11; i++) {
 516                 ret = (((ret&1)<<7)|((ret&0xfe)>>1)) + str[i];
 517         }
 518
 519         return ret;
 520 }
 521 #endif
 522
 523
 524 /*
 525  * Get the directory entry associated with 'filename' from the directory
 526  * starting at 'startsect'
 527  */
 528 __u8 get_dentfromdir_block[MAX_CLUSTSIZE];
 529 static dir_entry *get_dentfromdir (fsdata * mydata, int startsect,
 530                                    char *filename, dir_entry * retdent,
 531                                    int dols)
 532 {
 533     __u16 prevcksum = 0xffff;
 534     __u32 curclust = START (retdent);
 535     int files = 0, dirs = 0;
 536
 537     FAT_DPRINT ("get_dentfromdir: %s\n", filename);
 538     while (1) {
 539         dir_entry *dentptr;
 540         int i;
 541
 542         if (get_cluster (mydata, curclust, get_dentfromdir_block,
 543                  mydata->clust_size * SECTOR_SIZE) != 0) {
 544             FAT_DPRINT ("Error: reading directory block\n");
 545             return NULL;
 546         }
 547         dentptr = (dir_entry *) get_dentfromdir_block;
 548         for (i = 0; i < DIRENTSPERCLUST; i++) {
 549             char s_name[14], l_name[256];
 550
 551             l_name[0] = '\0';
 552             if (dentptr->name[0] == DELETED_FLAG) {
 553                     dentptr++;
 554                     continue;
 555             }
 556             if ((dentptr->attr & ATTR_VOLUME)) {
 557 #ifdef CONFIG_SUPPORT_VFAT
 558                 if ((dentptr->attr & ATTR_VFAT) &&
 559                     (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
 560                     prevcksum = ((dir_slot *) dentptr)
 561                             ->alias_checksum;
 562                     get_vfatname (mydata, curclust, get_dentfromdir_block,
 563                                   dentptr, l_name);
 564                     if (dols) {
 565                         int isdir = (dentptr->attr & ATTR_DIR);
 566                         char dirc;
 567                         int doit = 0;
 568
 569                         if (isdir) {
 570                             dirs++;
 571                             dirc = '/';
 572                             doit = 1;
 573                         } else {
 574                             dirc = ' ';
 575                             if (l_name[0] != 0) {
 576                                 files++;
 577                                 doit = 1;
 578                             }
 579                         }
 580                         if (doit) {
 581                             if (dirc == ' ') {
 582                                 printf (" %8ld   %s%c\n",
 583                                         (long) FAT2CPU32 (dentptr->size),
 584                                         l_name, dirc);
 585                             } else {
 586                                 printf ("            %s%c\n", l_name, dirc);
 587                             }
 588                         }
 589                         dentptr++;
 590                         continue;
 591                     }
 592                     FAT_DPRINT ("vfatname: |%s|\n", l_name);
 593                 } else
 594 #endif
 595                 {
 596                     /* Volume label or VFAT entry */
 597                     dentptr++;
 598                     continue;
 599                 }
 600             }
 601             if (dentptr->name[0] == 0) {
 602                 if (dols) {
 603                     printf ("\n%d file(s), %d dir(s)\n\n", files, dirs);
 604                 }
 605                 FAT_DPRINT ("Dentname == NULL - %d\n", i);
 606                 return NULL;
 607             }
 608 #ifdef CONFIG_SUPPORT_VFAT
 609             if (dols && mkcksum (dentptr->name) == prevcksum) {
 610                 dentptr++;
 611                 continue;
 612             }
 613 #endif
 614             get_name (dentptr, s_name);
 615             if (dols) {
 616                 int isdir = (dentptr->attr & ATTR_DIR);
 617                 char dirc;
 618                 int doit = 0;
 619
 620                 if (isdir) {
 621                     dirs++;
 622                     dirc = '/';
 623                     doit = 1;
 624                 } else {
 625                     dirc = ' ';
 626                     if (s_name[0] != 0) {
 627                         files++;
 628                         doit = 1;
 629                     }
 630                 }
 631                 if (doit) {
 632                     if (dirc == ' ') {
 633                         printf (" %8ld   %s%c\n",
 634                                 (long) FAT2CPU32 (dentptr->size), s_name,
 635                                 dirc);
 636                     } else {
 637                         printf ("            %s%c\n", s_name, dirc);
 638                     }
 639                 }
 640                 dentptr++;
 641                 continue;
 642             }
 643             if (strcmp (filename, s_name) && strcmp (filename, l_name)) {
 644                 FAT_DPRINT ("Mismatch: |%s|%s|\n", s_name, l_name);
 645                 dentptr++;
 646                 continue;
 647             }
 648             memcpy (retdent, dentptr, sizeof (dir_entry));
 649
 650             FAT_DPRINT ("DentName: %s", s_name);
 651             FAT_DPRINT (", start: 0x%x", START (dentptr));
 652             FAT_DPRINT (", size:  0x%x %s\n",
 653                         FAT2CPU32 (dentptr->size),
 654                         (dentptr->attr & ATTR_DIR) ? "(DIR)" : "");
 655
 656             return retdent;
 657         }
 658         curclust = get_fatent (mydata, curclust);
 659         if (curclust <= 0x0001 || curclust >= 0xfff0) {
 660             FAT_DPRINT ("curclust: 0x%x\n", curclust);
 661             FAT_ERROR ("Invalid FAT entry\n");
 662             return NULL;
 663         }
 664     }
 665
 666     return NULL;
 667 }
 668
 669
 670 /*
 671  * Read boot sector and volume info from a FAT filesystem
 672  */
 673 static int
 674 read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize)
 675 {
 676         __u8 block[FS_BLOCK_SIZE];
 677         volume_info *vistart;
 678
 679         if (disk_read(0, 1, block) < 0) {
 680                 FAT_DPRINT("Error: reading block\n");
 681                 return -1;
 682         }
 683
 684         memcpy(bs, block, sizeof(boot_sector));
 685         bs->reserved    = FAT2CPU16(bs->reserved);
 686         bs->fat_length  = FAT2CPU16(bs->fat_length);
 687         bs->secs_track  = FAT2CPU16(bs->secs_track);
 688         bs->heads       = FAT2CPU16(bs->heads);
 689 #if 0 /* UNUSED */
 690         bs->hidden      = FAT2CPU32(bs->hidden);
 691 #endif
 692         bs->total_sect  = FAT2CPU32(bs->total_sect);
 693
 694         /* FAT32 entries */
 695         if (bs->fat_length == 0) {
 696                 /* Assume FAT32 */
 697                 bs->fat32_length = FAT2CPU32(bs->fat32_length);
 698                 bs->flags        = FAT2CPU16(bs->flags);
 699                 bs->root_cluster = FAT2CPU32(bs->root_cluster);
 700                 bs->info_sector  = FAT2CPU16(bs->info_sector);
 701                 bs->backup_boot  = FAT2CPU16(bs->backup_boot);
 702                 vistart = (volume_info*) (block + sizeof(boot_sector));
 703                 *fatsize = 32;
 704         } else {
 705                 vistart = (volume_info*) &(bs->fat32_length);
 706                 *fatsize = 0;
 707         }
 708         memcpy(volinfo, vistart, sizeof(volume_info));
 709
 710         /* Terminate fs_type string. Writing past the end of vistart
 711            is ok - it's just the buffer. */
 712         vistart->fs_type[8] = '\0';
 713
 714         if (*fatsize == 32) {
 715                 if (compare_sign(FAT32_SIGN, vistart->fs_type) == 0) {
 716                         return 0;
 717                 }
 718         } else {
 719                 if (compare_sign(FAT12_SIGN, vistart->fs_type) == 0) {
 720                         *fatsize = 12;
 721                         return 0;
 722                 }
 723                 if (compare_sign(FAT16_SIGN, vistart->fs_type) == 0) {
 724                         *fatsize = 16;
 725                         return 0;
 726                 }
 727         }
 728
 729         FAT_DPRINT("Error: broken fs_type sign\n");
 730         return -1;
 731 }
 732
 733
 734 __u8 do_fat_read_block[MAX_CLUSTSIZE];  /* Block buffer */
 735 long
 736 do_fat_read (const char *filename, void *buffer, unsigned long maxsize,
 737              int dols)
 738 {
 739 #if CONFIG_NIOS /* NIOS CPU cannot access big automatic arrays */
 740     static
 741 #endif
 742     char fnamecopy[2048];
 743     boot_sector bs;
 744     volume_info volinfo;
 745     fsdata datablock;
 746     fsdata *mydata = &datablock;
 747     dir_entry *dentptr;
 748     __u16 prevcksum = 0xffff;
 749     char *subname = "";
 750     int rootdir_size, cursect;
 751     int idx, isdir = 0;
 752     int files = 0, dirs = 0;
 753     long ret = 0;
 754     int firsttime;
 755
 756     if (read_bootsectandvi (&bs, &volinfo, &mydata->fatsize)) {
 757         FAT_DPRINT ("Error: reading boot sector\n");
 758         return -1;
 759     }
 760     if (mydata->fatsize == 32) {
 761         mydata->fatlength = bs.fat32_length;
 762     } else {
 763         mydata->fatlength = bs.fat_length;
 764     }
 765     mydata->fat_sect = bs.reserved;
 766     cursect = mydata->rootdir_sect
 767             = mydata->fat_sect + mydata->fatlength * bs.fats;
 768     mydata->clust_size = bs.cluster_size;
 769     if (mydata->fatsize == 32) {
 770         rootdir_size = mydata->clust_size;
 771         mydata->data_begin = mydata->rootdir_sect   /* + rootdir_size */
 772                 - (mydata->clust_size * 2);
 773     } else {
 774         rootdir_size = ((bs.dir_entries[1] * (int) 256 + bs.dir_entries[0])
 775                         * sizeof (dir_entry)) / SECTOR_SIZE;
 776         mydata->data_begin = mydata->rootdir_sect + rootdir_size
 777                 - (mydata->clust_size * 2);
 778     }
 779     mydata->fatbufnum = -1;
 780
 781     FAT_DPRINT ("FAT%d, fatlength: %d\n", mydata->fatsize,
 782                 mydata->fatlength);
 783     FAT_DPRINT ("Rootdir begins at sector: %d, offset: %x, size: %d\n"
 784                 "Data begins at: %d\n",
 785                 mydata->rootdir_sect, mydata->rootdir_sect * SECTOR_SIZE,
 786                 rootdir_size, mydata->data_begin);
 787     FAT_DPRINT ("Cluster size: %d\n", mydata->clust_size);
 788
 789     /* "cwd" is always the root... */
 790     while (ISDIRDELIM (*filename))
 791         filename++;
 792     /* Make a copy of the filename and convert it to lowercase */
 793     strcpy (fnamecopy, filename);
 794     downcase (fnamecopy);
 795     if (*fnamecopy == '\0') {
 796         if (!dols)
 797             return -1;
 798         dols = LS_ROOT;
 799     } else if ((idx = dirdelim (fnamecopy)) >= 0) {
 800         isdir = 1;
 801         fnamecopy[idx] = '\0';
 802         subname = fnamecopy + idx + 1;
 803         /* Handle multiple delimiters */
 804         while (ISDIRDELIM (*subname))
 805             subname++;
 806     } else if (dols) {
 807         isdir = 1;
 808     }
 809
 810     while (1) {
 811         int i;
 812
 813         if (disk_read (cursect, mydata->clust_size, do_fat_read_block) < 0) {
 814             FAT_DPRINT ("Error: reading rootdir block\n");
 815             return -1;
 816         }
 817         dentptr = (dir_entry *) do_fat_read_block;
 818         for (i = 0; i < DIRENTSPERBLOCK; i++) {
 819             char s_name[14], l_name[256];
 820
 821             l_name[0] = '\0';
 822             if ((dentptr->attr & ATTR_VOLUME)) {
 823 #ifdef CONFIG_SUPPORT_VFAT
 824                 if ((dentptr->attr & ATTR_VFAT) &&
 825                     (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
 826                     prevcksum = ((dir_slot *) dentptr)->alias_checksum;
 827                     get_vfatname (mydata, 0, do_fat_read_block, dentptr, l_name);
 828                     if (dols == LS_ROOT) {
 829                         int isdir = (dentptr->attr & ATTR_DIR);
 830                         char dirc;
 831                         int doit = 0;
 832
 833                         if (isdir) {
 834                             dirs++;
 835                             dirc = '/';
 836                             doit = 1;
 837                         } else {
 838                             dirc = ' ';
 839                             if (l_name[0] != 0) {
 840                                 files++;
 841                                 doit = 1;
 842                             }
 843                         }
 844                         if (doit) {
 845                             if (dirc == ' ') {
 846                                 printf (" %8ld   %s%c\n",
 847                                         (long) FAT2CPU32 (dentptr->size),
 848                                         l_name, dirc);
 849                             } else {
 850                                 printf ("            %s%c\n", l_name, dirc);
 851                             }
 852                         }
 853                         dentptr++;
 854                         continue;
 855                     }
 856                     FAT_DPRINT ("Rootvfatname: |%s|\n", l_name);
 857                 } else
 858 #endif
 859                 {
 860                     /* Volume label or VFAT entry */
 861                     dentptr++;
 862                     continue;
 863                 }
 864             } else if (dentptr->name[0] == 0) {
 865                 FAT_DPRINT ("RootDentname == NULL - %d\n", i);
 866                 if (dols == LS_ROOT) {
 867                     printf ("\n%d file(s), %d dir(s)\n\n", files, dirs);
 868                     return 0;
 869                 }
 870                 return -1;
 871             }
 872 #ifdef CONFIG_SUPPORT_VFAT
 873             else if (dols == LS_ROOT
 874                      && mkcksum (dentptr->name) == prevcksum) {
 875                 dentptr++;
 876                 continue;
 877             }
 878 #endif
 879             get_name (dentptr, s_name);
 880             if (dols == LS_ROOT) {
 881                 int isdir = (dentptr->attr & ATTR_DIR);
 882                 char dirc;
 883                 int doit = 0;
 884
 885                 if (isdir) {
 886                     dirc = '/';
 887                     if (s_name[0] != 0) {
 888                         dirs++;
 889                         doit = 1;
 890                     }
 891                 } else {
 892                     dirc = ' ';
 893                     if (s_name[0] != 0) {
 894                         files++;
 895                         doit = 1;
 896                     }
 897                 }
 898                 if (doit) {
 899                     if (dirc == ' ') {
 900                         printf (" %8ld   %s%c\n",
 901                                 (long) FAT2CPU32 (dentptr->size), s_name,
 902                                 dirc);
 903                     } else {
 904                         printf ("            %s%c\n", s_name, dirc);
 905                     }
 906                 }
 907                 dentptr++;
 908                 continue;
 909             }
 910             if (strcmp (fnamecopy, s_name) && strcmp (fnamecopy, l_name)) {
 911                 FAT_DPRINT ("RootMismatch: |%s|%s|\n", s_name, l_name);
 912                 dentptr++;
 913                 continue;
 914             }
 915             if (isdir && !(dentptr->attr & ATTR_DIR))
 916                 return -1;
 917
 918             FAT_DPRINT ("RootName: %s", s_name);
 919             FAT_DPRINT (", start: 0x%x", START (dentptr));
 920             FAT_DPRINT (", size:  0x%x %s\n",
 921                         FAT2CPU32 (dentptr->size), isdir ? "(DIR)" : "");
 922
 923             goto rootdir_done;  /* We got a match */
 924         }
 925         cursect++;
 926     }
 927   rootdir_done:
 928
 929     firsttime = 1;
 930     while (isdir) {
 931         int startsect = mydata->data_begin
 932                 + START (dentptr) * mydata->clust_size;
 933         dir_entry dent;
 934         char *nextname = NULL;
 935
 936         dent = *dentptr;
 937         dentptr = &dent;
 938
 939         idx = dirdelim (subname);
 940         if (idx >= 0) {
 941             subname[idx] = '\0';
 942             nextname = subname + idx + 1;
 943             /* Handle multiple delimiters */
 944             while (ISDIRDELIM (*nextname))
 945                 nextname++;
 946             if (dols && *nextname == '\0')
 947                 firsttime = 0;
 948         } else {
 949             if (dols && firsttime) {
 950                 firsttime = 0;
 951             } else {
 952                 isdir = 0;
 953             }
 954         }
 955
 956         if (get_dentfromdir (mydata, startsect, subname, dentptr,
 957                              isdir ? 0 : dols) == NULL) {
 958             if (dols && !isdir)
 959                 return 0;
 960             return -1;
 961         }
 962
 963         if (idx >= 0) {
 964             if (!(dentptr->attr & ATTR_DIR))
 965                 return -1;
 966             subname = nextname;
 967         }
 968     }
 969     ret = get_contents (mydata, dentptr, buffer, maxsize);
 970     FAT_DPRINT ("Size: %d, got: %ld\n", FAT2CPU32 (dentptr->size), ret);
 971
 972     return ret;
 973 }
 974
 975
 976 int
 977 file_fat_detectfs(void)
 978 {
 979         boot_sector     bs;
 980         volume_info     volinfo;
 981         int             fatsize;
 982         char    vol_label[12];
 983
 984         if(cur_dev==NULL) {
 985                 printf("No current device\n");
 986                 return 1;
 987         }
 988 #if defined(CONFIG_CMD_IDE) || \
 989     defined(CONFIG_CMD_SCSI) || \
 990     defined(CONFIG_CMD_USB) || \
 991     (CONFIG_MMC)
 992         printf("Interface:  ");
 993         switch(cur_dev->if_type) {
 994                 case IF_TYPE_IDE :      printf("IDE"); break;
 995                 case IF_TYPE_SCSI :     printf("SCSI"); break;
 996                 case IF_TYPE_ATAPI :    printf("ATAPI"); break;
 997                 case IF_TYPE_USB :      printf("USB"); break;
 998                 case IF_TYPE_DOC :      printf("DOC"); break;
 999                 case IF_TYPE_MMC :      printf("MMC"); break;
1000                 default :               printf("Unknown");
1001         }
1002         printf("\n  Device %d: ",cur_dev->dev);
1003         dev_print(cur_dev);
1004 #endif
1005         if(read_bootsectandvi(&bs, &volinfo, &fatsize)) {
1006                 printf("\nNo valid FAT fs found\n");
1007                 return 1;
1008         }
1009         memcpy (vol_label, volinfo.volume_label, 11);
1010         vol_label[11] = '\0';
1011         volinfo.fs_type[5]='\0';
1012         printf("Partition %d: Filesystem: %s \"%s\"\n"
1013                         ,cur_part,volinfo.fs_type,vol_label);
1014         return 0;
1015 }
1016
1017
1018 int
1019 file_fat_ls(const char *dir)
1020 {
1021         return do_fat_read(dir, NULL, 0, LS_YES);
1022 }
1023
1024
1025 long
1026 file_fat_read(const char *filename, void *buffer, unsigned long maxsize)
1027 {
1028         printf("reading %s\n",filename);
1029         return do_fat_read(filename, buffer, maxsize, LS_NO);
1030 }
1031
1032 #endif