git.sur5r.net Git - u-boot/blob - 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 <exports.h>
  31 #include <fat.h>
  32 #include <asm/byteorder.h>
  33 #include <part.h>
  34 #include <malloc.h>
  35 #include <linux/compiler.h>
  36
  37 /*
  38  * Convert a string to lowercase.
  39  */
  40 static void downcase(char *str)
  41 {
  42         while (*str != '\0') {
  43                 TOLOWER(*str);
  44                 str++;
  45         }
  46 }
  47
  48 static block_dev_desc_t *cur_dev;
  49 static unsigned int cur_part_nr;
  50 static disk_partition_t cur_part_info;
  51
  52 #define DOS_BOOT_MAGIC_OFFSET   0x1fe
  53 #define DOS_FS_TYPE_OFFSET      0x36
  54 #define DOS_FS32_TYPE_OFFSET    0x52
  55
  56 static int disk_read(__u32 block, __u32 nr_blocks, void *buf)
  57 {
  58         if (!cur_dev || !cur_dev->block_read)
  59                 return -1;
  60
  61         return cur_dev->block_read(cur_dev->dev,
  62                         cur_part_info.start + block, nr_blocks, buf);
  63 }
  64
  65 int fat_register_device(block_dev_desc_t * dev_desc, int part_no)
  66 {
  67         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
  68
  69         /* First close any currently found FAT filesystem */
  70         cur_dev = NULL;
  71
  72 #if (defined(CONFIG_CMD_IDE) || \
  73      defined(CONFIG_CMD_SATA) || \
  74      defined(CONFIG_CMD_SCSI) || \
  75      defined(CONFIG_CMD_USB) || \
  76      defined(CONFIG_MMC) || \
  77      defined(CONFIG_SYSTEMACE) )
  78
  79         /* Read the partition table, if present */
  80         if (!get_partition_info(dev_desc, part_no, &cur_part_info)) {
  81                 cur_dev = dev_desc;
  82                 cur_part_nr = part_no;
  83         }
  84 #endif
  85
  86         /* Otherwise it might be a superfloppy (whole-disk FAT filesystem) */
  87         if (!cur_dev) {
  88                 if (part_no != 1) {
  89                         printf("** Partition %d not valid on device %d **\n",
  90                                         part_no, dev_desc->dev);
  91                         return -1;
  92                 }
  93
  94                 cur_dev = dev_desc;
  95                 cur_part_nr = 1;
  96                 cur_part_info.start = 0;
  97                 cur_part_info.size = dev_desc->lba;
  98                 cur_part_info.blksz = dev_desc->blksz;
  99                 memset(cur_part_info.name, 0, sizeof(cur_part_info.name));
 100                 memset(cur_part_info.type, 0, sizeof(cur_part_info.type));
 101         }
 102
 103         /* Make sure it has a valid FAT header */
 104         if (disk_read(0, 1, buffer) != 1) {
 105                 cur_dev = NULL;
 106                 return -1;
 107         }
 108
 109         /* Check if it's actually a DOS volume */
 110         if (memcmp(buffer + DOS_BOOT_MAGIC_OFFSET, "\x55\xAA", 2)) {
 111                 cur_dev = NULL;
 112                 return -1;
 113         }
 114
 115         /* Check for FAT12/FAT16/FAT32 filesystem */
 116         if (!memcmp(buffer + DOS_FS_TYPE_OFFSET, "FAT", 3))
 117                 return 0;
 118         if (!memcmp(buffer + DOS_FS32_TYPE_OFFSET, "FAT32", 5))
 119                 return 0;
 120
 121         cur_dev = NULL;
 122         return -1;
 123 }
 124
 125
 126 /*
 127  * Get the first occurence of a directory delimiter ('/' or '\') in a string.
 128  * Return index into string if found, -1 otherwise.
 129  */
 130 static int dirdelim(char *str)
 131 {
 132         char *start = str;
 133
 134         while (*str != '\0') {
 135                 if (ISDIRDELIM(*str))
 136                         return str - start;
 137                 str++;
 138         }
 139         return -1;
 140 }
 141
 142 /*
 143  * Extract zero terminated short name from a directory entry.
 144  */
 145 static void get_name(dir_entry *dirent, char *s_name)
 146 {
 147         char *ptr;
 148
 149         memcpy(s_name, dirent->name, 8);
 150         s_name[8] = '\0';
 151         ptr = s_name;
 152         while (*ptr && *ptr != ' ')
 153                 ptr++;
 154         if (dirent->ext[0] && dirent->ext[0] != ' ') {
 155                 *ptr = '.';
 156                 ptr++;
 157                 memcpy(ptr, dirent->ext, 3);
 158                 ptr[3] = '\0';
 159                 while (*ptr && *ptr != ' ')
 160                         ptr++;
 161         }
 162         *ptr = '\0';
 163         if (*s_name == DELETED_FLAG)
 164                 *s_name = '\0';
 165         else if (*s_name == aRING)
 166                 *s_name = DELETED_FLAG;
 167         downcase(s_name);
 168 }
 169
 170 /*
 171  * Get the entry at index 'entry' in a FAT (12/16/32) table.
 172  * On failure 0x00 is returned.
 173  */
 174 static __u32 get_fatent(fsdata *mydata, __u32 entry)
 175 {
 176         __u32 bufnum;
 177         __u32 off16, offset;
 178         __u32 ret = 0x00;
 179         __u16 val1, val2;
 180
 181         switch (mydata->fatsize) {
 182         case 32:
 183                 bufnum = entry / FAT32BUFSIZE;
 184                 offset = entry - bufnum * FAT32BUFSIZE;
 185                 break;
 186         case 16:
 187                 bufnum = entry / FAT16BUFSIZE;
 188                 offset = entry - bufnum * FAT16BUFSIZE;
 189                 break;
 190         case 12:
 191                 bufnum = entry / FAT12BUFSIZE;
 192                 offset = entry - bufnum * FAT12BUFSIZE;
 193                 break;
 194
 195         default:
 196                 /* Unsupported FAT size */
 197                 return ret;
 198         }
 199
 200         debug("FAT%d: entry: 0x%04x = %d, offset: 0x%04x = %d\n",
 201                mydata->fatsize, entry, entry, offset, offset);
 202
 203         /* Read a new block of FAT entries into the cache. */
 204         if (bufnum != mydata->fatbufnum) {
 205                 __u32 getsize = FATBUFBLOCKS;
 206                 __u8 *bufptr = mydata->fatbuf;
 207                 __u32 fatlength = mydata->fatlength;
 208                 __u32 startblock = bufnum * FATBUFBLOCKS;
 209
 210                 if (startblock + getsize > fatlength)
 211                         getsize = fatlength - startblock;
 212
 213                 startblock += mydata->fat_sect; /* Offset from start of disk */
 214
 215                 if (disk_read(startblock, getsize, bufptr) < 0) {
 216                         debug("Error reading FAT blocks\n");
 217                         return ret;
 218                 }
 219                 mydata->fatbufnum = bufnum;
 220         }
 221
 222         /* Get the actual entry from the table */
 223         switch (mydata->fatsize) {
 224         case 32:
 225                 ret = FAT2CPU32(((__u32 *) mydata->fatbuf)[offset]);
 226                 break;
 227         case 16:
 228                 ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[offset]);
 229                 break;
 230         case 12:
 231                 off16 = (offset * 3) / 4;
 232
 233                 switch (offset & 0x3) {
 234                 case 0:
 235                         ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[off16]);
 236                         ret &= 0xfff;
 237                         break;
 238                 case 1:
 239                         val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
 240                         val1 &= 0xf000;
 241                         val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]);
 242                         val2 &= 0x00ff;
 243                         ret = (val2 << 4) | (val1 >> 12);
 244                         break;
 245                 case 2:
 246                         val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
 247                         val1 &= 0xff00;
 248                         val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]);
 249                         val2 &= 0x000f;
 250                         ret = (val2 << 8) | (val1 >> 8);
 251                         break;
 252                 case 3:
 253                         ret = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
 254                         ret = (ret & 0xfff0) >> 4;
 255                         break;
 256                 default:
 257                         break;
 258                 }
 259                 break;
 260         }
 261         debug("FAT%d: ret: %08x, offset: %04x\n",
 262                mydata->fatsize, ret, offset);
 263
 264         return ret;
 265 }
 266
 267 /*
 268  * Read at most 'size' bytes from the specified cluster into 'buffer'.
 269  * Return 0 on success, -1 otherwise.
 270  */
 271 static int
 272 get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size)
 273 {
 274         __u32 idx = 0;
 275         __u32 startsect;
 276         __u32 nr_sect;
 277         int ret;
 278
 279         if (clustnum > 0) {
 280                 startsect = mydata->data_begin +
 281                                 clustnum * mydata->clust_size;
 282         } else {
 283                 startsect = mydata->rootdir_sect;
 284         }
 285
 286         debug("gc - clustnum: %d, startsect: %d\n", clustnum, startsect);
 287
 288         nr_sect = size / mydata->sect_size;
 289         ret = disk_read(startsect, nr_sect, buffer);
 290         if (ret != nr_sect) {
 291                 debug("Error reading data (got %d)\n", ret);
 292                 return -1;
 293         }
 294         if (size % mydata->sect_size) {
 295                 ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size);
 296
 297                 idx = size / mydata->sect_size;
 298                 ret = disk_read(startsect + idx, 1, tmpbuf);
 299                 if (ret != 1) {
 300                         debug("Error reading data (got %d)\n", ret);
 301                         return -1;
 302                 }
 303                 buffer += idx * mydata->sect_size;
 304
 305                 memcpy(buffer, tmpbuf, size % mydata->sect_size);
 306                 return 0;
 307         }
 308
 309         return 0;
 310 }
 311
 312 /*
 313  * Read at most 'maxsize' bytes from the file associated with 'dentptr'
 314  * into 'buffer'.
 315  * Return the number of bytes read or -1 on fatal errors.
 316  */
 317 static long
 318 get_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer,
 319              unsigned long maxsize)
 320 {
 321         unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0;
 322         unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;
 323         __u32 curclust = START(dentptr);
 324         __u32 endclust, newclust;
 325         unsigned long actsize;
 326
 327         debug("Filesize: %ld bytes\n", filesize);
 328
 329         if (maxsize > 0 && filesize > maxsize)
 330                 filesize = maxsize;
 331
 332         debug("%ld bytes\n", filesize);
 333
 334         actsize = bytesperclust;
 335         endclust = curclust;
 336
 337         do {
 338                 /* search for consecutive clusters */
 339                 while (actsize < filesize) {
 340                         newclust = get_fatent(mydata, endclust);
 341                         if ((newclust - 1) != endclust)
 342                                 goto getit;
 343                         if (CHECK_CLUST(newclust, mydata->fatsize)) {
 344                                 debug("curclust: 0x%x\n", newclust);
 345                                 debug("Invalid FAT entry\n");
 346                                 return gotsize;
 347                         }
 348                         endclust = newclust;
 349                         actsize += bytesperclust;
 350                 }
 351
 352                 /* actsize >= file size */
 353                 actsize -= bytesperclust;
 354
 355                 /* get remaining clusters */
 356                 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
 357                         printf("Error reading cluster\n");
 358                         return -1;
 359                 }
 360
 361                 /* get remaining bytes */
 362                 gotsize += (int)actsize;
 363                 filesize -= actsize;
 364                 buffer += actsize;
 365                 actsize = filesize;
 366                 if (get_cluster(mydata, endclust, buffer, (int)actsize) != 0) {
 367                         printf("Error reading cluster\n");
 368                         return -1;
 369                 }
 370                 gotsize += actsize;
 371                 return gotsize;
 372 getit:
 373                 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
 374                         printf("Error reading cluster\n");
 375                         return -1;
 376                 }
 377                 gotsize += (int)actsize;
 378                 filesize -= actsize;
 379                 buffer += actsize;
 380
 381                 curclust = get_fatent(mydata, endclust);
 382                 if (CHECK_CLUST(curclust, mydata->fatsize)) {
 383                         debug("curclust: 0x%x\n", curclust);
 384                         printf("Invalid FAT entry\n");
 385                         return gotsize;
 386                 }
 387                 actsize = bytesperclust;
 388                 endclust = curclust;
 389         } while (1);
 390 }
 391
 392 #ifdef CONFIG_SUPPORT_VFAT
 393 /*
 394  * Extract the file name information from 'slotptr' into 'l_name',
 395  * starting at l_name[*idx].
 396  * Return 1 if terminator (zero byte) is found, 0 otherwise.
 397  */
 398 static int slot2str(dir_slot *slotptr, char *l_name, int *idx)
 399 {
 400         int j;
 401
 402         for (j = 0; j <= 8; j += 2) {
 403                 l_name[*idx] = slotptr->name0_4[j];
 404                 if (l_name[*idx] == 0x00)
 405                         return 1;
 406                 (*idx)++;
 407         }
 408         for (j = 0; j <= 10; j += 2) {
 409                 l_name[*idx] = slotptr->name5_10[j];
 410                 if (l_name[*idx] == 0x00)
 411                         return 1;
 412                 (*idx)++;
 413         }
 414         for (j = 0; j <= 2; j += 2) {
 415                 l_name[*idx] = slotptr->name11_12[j];
 416                 if (l_name[*idx] == 0x00)
 417                         return 1;
 418                 (*idx)++;
 419         }
 420
 421         return 0;
 422 }
 423
 424 /*
 425  * Extract the full long filename starting at 'retdent' (which is really
 426  * a slot) into 'l_name'. If successful also copy the real directory entry
 427  * into 'retdent'
 428  * Return 0 on success, -1 otherwise.
 429  */
 430 __u8 get_vfatname_block[MAX_CLUSTSIZE]
 431         __aligned(ARCH_DMA_MINALIGN);
 432
 433 static int
 434 get_vfatname(fsdata *mydata, int curclust, __u8 *cluster,
 435              dir_entry *retdent, char *l_name)
 436 {
 437         dir_entry *realdent;
 438         dir_slot *slotptr = (dir_slot *)retdent;
 439         __u8 *buflimit = cluster + mydata->sect_size * ((curclust == 0) ?
 440                                                         PREFETCH_BLOCKS :
 441                                                         mydata->clust_size);
 442         __u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff;
 443         int idx = 0;
 444
 445         if (counter > VFAT_MAXSEQ) {
 446                 debug("Error: VFAT name is too long\n");
 447                 return -1;
 448         }
 449
 450         while ((__u8 *)slotptr < buflimit) {
 451                 if (counter == 0)
 452                         break;
 453                 if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter)
 454                         return -1;
 455                 slotptr++;
 456                 counter--;
 457         }
 458
 459         if ((__u8 *)slotptr >= buflimit) {
 460                 dir_slot *slotptr2;
 461
 462                 if (curclust == 0)
 463                         return -1;
 464                 curclust = get_fatent(mydata, curclust);
 465                 if (CHECK_CLUST(curclust, mydata->fatsize)) {
 466                         debug("curclust: 0x%x\n", curclust);
 467                         printf("Invalid FAT entry\n");
 468                         return -1;
 469                 }
 470
 471                 if (get_cluster(mydata, curclust, get_vfatname_block,
 472                                 mydata->clust_size * mydata->sect_size) != 0) {
 473                         debug("Error: reading directory block\n");
 474                         return -1;
 475                 }
 476
 477                 slotptr2 = (dir_slot *)get_vfatname_block;
 478                 while (counter > 0) {
 479                         if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK)
 480                             & 0xff) != counter)
 481                                 return -1;
 482                         slotptr2++;
 483                         counter--;
 484                 }
 485
 486                 /* Save the real directory entry */
 487                 realdent = (dir_entry *)slotptr2;
 488                 while ((__u8 *)slotptr2 > get_vfatname_block) {
 489                         slotptr2--;
 490                         slot2str(slotptr2, l_name, &idx);
 491                 }
 492         } else {
 493                 /* Save the real directory entry */
 494                 realdent = (dir_entry *)slotptr;
 495         }
 496
 497         do {
 498                 slotptr--;
 499                 if (slot2str(slotptr, l_name, &idx))
 500                         break;
 501         } while (!(slotptr->id & LAST_LONG_ENTRY_MASK));
 502
 503         l_name[idx] = '\0';
 504         if (*l_name == DELETED_FLAG)
 505                 *l_name = '\0';
 506         else if (*l_name == aRING)
 507                 *l_name = DELETED_FLAG;
 508         downcase(l_name);
 509
 510         /* Return the real directory entry */
 511         memcpy(retdent, realdent, sizeof(dir_entry));
 512
 513         return 0;
 514 }
 515
 516 /* Calculate short name checksum */
 517 static __u8 mkcksum(const char *str)
 518 {
 519         int i;
 520
 521         __u8 ret = 0;
 522
 523         for (i = 0; i < 11; i++) {
 524                 ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + str[i];
 525         }
 526
 527         return ret;
 528 }
 529 #endif  /* CONFIG_SUPPORT_VFAT */
 530
 531 /*
 532  * Get the directory entry associated with 'filename' from the directory
 533  * starting at 'startsect'
 534  */
 535 __u8 get_dentfromdir_block[MAX_CLUSTSIZE]
 536         __aligned(ARCH_DMA_MINALIGN);
 537
 538 static dir_entry *get_dentfromdir(fsdata *mydata, int startsect,
 539                                   char *filename, dir_entry *retdent,
 540                                   int dols)
 541 {
 542         __u16 prevcksum = 0xffff;
 543         __u32 curclust = START(retdent);
 544         int files = 0, dirs = 0;
 545
 546         debug("get_dentfromdir: %s\n", filename);
 547
 548         while (1) {
 549                 dir_entry *dentptr;
 550
 551                 int i;
 552
 553                 if (get_cluster(mydata, curclust, get_dentfromdir_block,
 554                                 mydata->clust_size * mydata->sect_size) != 0) {
 555                         debug("Error: reading directory block\n");
 556                         return NULL;
 557                 }
 558
 559                 dentptr = (dir_entry *)get_dentfromdir_block;
 560
 561                 for (i = 0; i < DIRENTSPERCLUST; i++) {
 562                         char s_name[14], l_name[VFAT_MAXLEN_BYTES];
 563
 564                         l_name[0] = '\0';
 565                         if (dentptr->name[0] == DELETED_FLAG) {
 566                                 dentptr++;
 567                                 continue;
 568                         }
 569                         if ((dentptr->attr & ATTR_VOLUME)) {
 570 #ifdef CONFIG_SUPPORT_VFAT
 571                                 if ((dentptr->attr & ATTR_VFAT) == ATTR_VFAT &&
 572                                     (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
 573                                         prevcksum = ((dir_slot *)dentptr)->alias_checksum;
 574                                         get_vfatname(mydata, curclust,
 575                                                      get_dentfromdir_block,
 576                                                      dentptr, l_name);
 577                                         if (dols) {
 578                                                 int isdir;
 579                                                 char dirc;
 580                                                 int doit = 0;
 581
 582                                                 isdir = (dentptr->attr & ATTR_DIR);
 583
 584                                                 if (isdir) {
 585                                                         dirs++;
 586                                                         dirc = '/';
 587                                                         doit = 1;
 588                                                 } else {
 589                                                         dirc = ' ';
 590                                                         if (l_name[0] != 0) {
 591                                                                 files++;
 592                                                                 doit = 1;
 593                                                         }
 594                                                 }
 595                                                 if (doit) {
 596                                                         if (dirc == ' ') {
 597                                                                 printf(" %8ld   %s%c\n",
 598                                                                         (long)FAT2CPU32(dentptr->size),
 599                                                                         l_name,
 600                                                                         dirc);
 601                                                         } else {
 602                                                                 printf("            %s%c\n",
 603                                                                         l_name,
 604                                                                         dirc);
 605                                                         }
 606                                                 }
 607                                                 dentptr++;
 608                                                 continue;
 609                                         }
 610                                         debug("vfatname: |%s|\n", l_name);
 611                                 } else
 612 #endif
 613                                 {
 614                                         /* Volume label or VFAT entry */
 615                                         dentptr++;
 616                                         continue;
 617                                 }
 618                         }
 619                         if (dentptr->name[0] == 0) {
 620                                 if (dols) {
 621                                         printf("\n%d file(s), %d dir(s)\n\n",
 622                                                 files, dirs);
 623                                 }
 624                                 debug("Dentname == NULL - %d\n", i);
 625                                 return NULL;
 626                         }
 627 #ifdef CONFIG_SUPPORT_VFAT
 628                         if (dols && mkcksum(dentptr->name) == prevcksum) {
 629                                 prevcksum = 0xffff;
 630                                 dentptr++;
 631                                 continue;
 632                         }
 633 #endif
 634                         get_name(dentptr, s_name);
 635                         if (dols) {
 636                                 int isdir = (dentptr->attr & ATTR_DIR);
 637                                 char dirc;
 638                                 int doit = 0;
 639
 640                                 if (isdir) {
 641                                         dirs++;
 642                                         dirc = '/';
 643                                         doit = 1;
 644                                 } else {
 645                                         dirc = ' ';
 646                                         if (s_name[0] != 0) {
 647                                                 files++;
 648                                                 doit = 1;
 649                                         }
 650                                 }
 651
 652                                 if (doit) {
 653                                         if (dirc == ' ') {
 654                                                 printf(" %8ld   %s%c\n",
 655                                                         (long)FAT2CPU32(dentptr->size),
 656                                                         s_name, dirc);
 657                                         } else {
 658                                                 printf("            %s%c\n",
 659                                                         s_name, dirc);
 660                                         }
 661                                 }
 662
 663                                 dentptr++;
 664                                 continue;
 665                         }
 666
 667                         if (strcmp(filename, s_name)
 668                             && strcmp(filename, l_name)) {
 669                                 debug("Mismatch: |%s|%s|\n", s_name, l_name);
 670                                 dentptr++;
 671                                 continue;
 672                         }
 673
 674                         memcpy(retdent, dentptr, sizeof(dir_entry));
 675
 676                         debug("DentName: %s", s_name);
 677                         debug(", start: 0x%x", START(dentptr));
 678                         debug(", size:  0x%x %s\n",
 679                               FAT2CPU32(dentptr->size),
 680                               (dentptr->attr & ATTR_DIR) ? "(DIR)" : "");
 681
 682                         return retdent;
 683                 }
 684
 685                 curclust = get_fatent(mydata, curclust);
 686                 if (CHECK_CLUST(curclust, mydata->fatsize)) {
 687                         debug("curclust: 0x%x\n", curclust);
 688                         printf("Invalid FAT entry\n");
 689                         return NULL;
 690                 }
 691         }
 692
 693         return NULL;
 694 }
 695
 696 /*
 697  * Read boot sector and volume info from a FAT filesystem
 698  */
 699 static int
 700 read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize)
 701 {
 702         __u8 *block;
 703         volume_info *vistart;
 704         int ret = 0;
 705
 706         if (cur_dev == NULL) {
 707                 debug("Error: no device selected\n");
 708                 return -1;
 709         }
 710
 711         block = memalign(ARCH_DMA_MINALIGN, cur_dev->blksz);
 712         if (block == NULL) {
 713                 debug("Error: allocating block\n");
 714                 return -1;
 715         }
 716
 717         if (disk_read(0, 1, block) < 0) {
 718                 debug("Error: reading block\n");
 719                 goto fail;
 720         }
 721
 722         memcpy(bs, block, sizeof(boot_sector));
 723         bs->reserved = FAT2CPU16(bs->reserved);
 724         bs->fat_length = FAT2CPU16(bs->fat_length);
 725         bs->secs_track = FAT2CPU16(bs->secs_track);
 726         bs->heads = FAT2CPU16(bs->heads);
 727         bs->total_sect = FAT2CPU32(bs->total_sect);
 728
 729         /* FAT32 entries */
 730         if (bs->fat_length == 0) {
 731                 /* Assume FAT32 */
 732                 bs->fat32_length = FAT2CPU32(bs->fat32_length);
 733                 bs->flags = FAT2CPU16(bs->flags);
 734                 bs->root_cluster = FAT2CPU32(bs->root_cluster);
 735                 bs->info_sector = FAT2CPU16(bs->info_sector);
 736                 bs->backup_boot = FAT2CPU16(bs->backup_boot);
 737                 vistart = (volume_info *)(block + sizeof(boot_sector));
 738                 *fatsize = 32;
 739         } else {
 740                 vistart = (volume_info *)&(bs->fat32_length);
 741                 *fatsize = 0;
 742         }
 743         memcpy(volinfo, vistart, sizeof(volume_info));
 744
 745         if (*fatsize == 32) {
 746                 if (strncmp(FAT32_SIGN, vistart->fs_type, SIGNLEN) == 0)
 747                         goto exit;
 748         } else {
 749                 if (strncmp(FAT12_SIGN, vistart->fs_type, SIGNLEN) == 0) {
 750                         *fatsize = 12;
 751                         goto exit;
 752                 }
 753                 if (strncmp(FAT16_SIGN, vistart->fs_type, SIGNLEN) == 0) {
 754                         *fatsize = 16;
 755                         goto exit;
 756                 }
 757         }
 758
 759         debug("Error: broken fs_type sign\n");
 760 fail:
 761         ret = -1;
 762 exit:
 763         free(block);
 764         return ret;
 765 }
 766
 767 __u8 do_fat_read_block[MAX_CLUSTSIZE]
 768         __aligned(ARCH_DMA_MINALIGN);
 769
 770 long
 771 do_fat_read(const char *filename, void *buffer, unsigned long maxsize, int dols)
 772 {
 773         char fnamecopy[2048];
 774         boot_sector bs;
 775         volume_info volinfo;
 776         fsdata datablock;
 777         fsdata *mydata = &datablock;
 778         dir_entry *dentptr = NULL;
 779         __u16 prevcksum = 0xffff;
 780         char *subname = "";
 781         __u32 cursect;
 782         int idx, isdir = 0;
 783         int files = 0, dirs = 0;
 784         long ret = -1;
 785         int firsttime;
 786         __u32 root_cluster = 0;
 787         int rootdir_size = 0;
 788         int j;
 789
 790         if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) {
 791                 debug("Error: reading boot sector\n");
 792                 return -1;
 793         }
 794
 795         if (mydata->fatsize == 32) {
 796                 root_cluster = bs.root_cluster;
 797                 mydata->fatlength = bs.fat32_length;
 798         } else {
 799                 mydata->fatlength = bs.fat_length;
 800         }
 801
 802         mydata->fat_sect = bs.reserved;
 803
 804         cursect = mydata->rootdir_sect
 805                 = mydata->fat_sect + mydata->fatlength * bs.fats;
 806
 807         mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0];
 808         mydata->clust_size = bs.cluster_size;
 809         if (mydata->sect_size != cur_part_info.blksz) {
 810                 printf("Error: FAT sector size mismatch (fs=%hu, dev=%lu)\n",
 811                                 mydata->sect_size, cur_part_info.blksz);
 812                 return -1;
 813         }
 814
 815         if (mydata->fatsize == 32) {
 816                 mydata->data_begin = mydata->rootdir_sect -
 817                                         (mydata->clust_size * 2);
 818         } else {
 819                 rootdir_size = ((bs.dir_entries[1]  * (int)256 +
 820                                  bs.dir_entries[0]) *
 821                                  sizeof(dir_entry)) /
 822                                  mydata->sect_size;
 823                 mydata->data_begin = mydata->rootdir_sect +
 824                                         rootdir_size -
 825                                         (mydata->clust_size * 2);
 826         }
 827
 828         mydata->fatbufnum = -1;
 829         mydata->fatbuf = memalign(ARCH_DMA_MINALIGN, FATBUFSIZE);
 830         if (mydata->fatbuf == NULL) {
 831                 debug("Error: allocating memory\n");
 832                 return -1;
 833         }
 834
 835 #ifdef CONFIG_SUPPORT_VFAT
 836         debug("VFAT Support enabled\n");
 837 #endif
 838         debug("FAT%d, fat_sect: %d, fatlength: %d\n",
 839                mydata->fatsize, mydata->fat_sect, mydata->fatlength);
 840         debug("Rootdir begins at cluster: %d, sector: %d, offset: %x\n"
 841                "Data begins at: %d\n",
 842                root_cluster,
 843                mydata->rootdir_sect,
 844                mydata->rootdir_sect * mydata->sect_size, mydata->data_begin);
 845         debug("Sector size: %d, cluster size: %d\n", mydata->sect_size,
 846               mydata->clust_size);
 847
 848         /* "cwd" is always the root... */
 849         while (ISDIRDELIM(*filename))
 850                 filename++;
 851
 852         /* Make a copy of the filename and convert it to lowercase */
 853         strcpy(fnamecopy, filename);
 854         downcase(fnamecopy);
 855
 856         if (*fnamecopy == '\0') {
 857                 if (!dols)
 858                         goto exit;
 859
 860                 dols = LS_ROOT;
 861         } else if ((idx = dirdelim(fnamecopy)) >= 0) {
 862                 isdir = 1;
 863                 fnamecopy[idx] = '\0';
 864                 subname = fnamecopy + idx + 1;
 865
 866                 /* Handle multiple delimiters */
 867                 while (ISDIRDELIM(*subname))
 868                         subname++;
 869         } else if (dols) {
 870                 isdir = 1;
 871         }
 872
 873         j = 0;
 874         while (1) {
 875                 int i;
 876
 877                 if (j == 0) {
 878                         debug("FAT read sect=%d, clust_size=%d, DIRENTSPERBLOCK=%zd\n",
 879                                 cursect, mydata->clust_size, DIRENTSPERBLOCK);
 880
 881                         if (disk_read(cursect,
 882                                         (mydata->fatsize == 32) ?
 883                                         (mydata->clust_size) :
 884                                         PREFETCH_BLOCKS,
 885                                         do_fat_read_block) < 0) {
 886                                 debug("Error: reading rootdir block\n");
 887                                 goto exit;
 888                         }
 889
 890                         dentptr = (dir_entry *) do_fat_read_block;
 891                 }
 892
 893                 for (i = 0; i < DIRENTSPERBLOCK; i++) {
 894                         char s_name[14], l_name[VFAT_MAXLEN_BYTES];
 895
 896                         l_name[0] = '\0';
 897                         if (dentptr->name[0] == DELETED_FLAG) {
 898                                 dentptr++;
 899                                 continue;
 900                         }
 901                         if ((dentptr->attr & ATTR_VOLUME)) {
 902 #ifdef CONFIG_SUPPORT_VFAT
 903                                 if ((dentptr->attr & ATTR_VFAT) == ATTR_VFAT &&
 904                                     (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
 905                                         prevcksum =
 906                                                 ((dir_slot *)dentptr)->alias_checksum;
 907
 908                                         get_vfatname(mydata,
 909                                                      root_cluster,
 910                                                      do_fat_read_block,
 911                                                      dentptr, l_name);
 912
 913                                         if (dols == LS_ROOT) {
 914                                                 char dirc;
 915                                                 int doit = 0;
 916                                                 int isdir =
 917                                                         (dentptr->attr & ATTR_DIR);
 918
 919                                                 if (isdir) {
 920                                                         dirs++;
 921                                                         dirc = '/';
 922                                                         doit = 1;
 923                                                 } else {
 924                                                         dirc = ' ';
 925                                                         if (l_name[0] != 0) {
 926                                                                 files++;
 927                                                                 doit = 1;
 928                                                         }
 929                                                 }
 930                                                 if (doit) {
 931                                                         if (dirc == ' ') {
 932                                                                 printf(" %8ld   %s%c\n",
 933                                                                         (long)FAT2CPU32(dentptr->size),
 934                                                                         l_name,
 935                                                                         dirc);
 936                                                         } else {
 937                                                                 printf("            %s%c\n",
 938                                                                         l_name,
 939                                                                         dirc);
 940                                                         }
 941                                                 }
 942                                                 dentptr++;
 943                                                 continue;
 944                                         }
 945                                         debug("Rootvfatname: |%s|\n",
 946                                                l_name);
 947                                 } else
 948 #endif
 949                                 {
 950                                         /* Volume label or VFAT entry */
 951                                         dentptr++;
 952                                         continue;
 953                                 }
 954                         } else if (dentptr->name[0] == 0) {
 955                                 debug("RootDentname == NULL - %d\n", i);
 956                                 if (dols == LS_ROOT) {
 957                                         printf("\n%d file(s), %d dir(s)\n\n",
 958                                                 files, dirs);
 959                                         ret = 0;
 960                                 }
 961                                 goto exit;
 962                         }
 963 #ifdef CONFIG_SUPPORT_VFAT
 964                         else if (dols == LS_ROOT &&
 965                                  mkcksum(dentptr->name) == prevcksum) {
 966                                 prevcksum = 0xffff;
 967                                 dentptr++;
 968                                 continue;
 969                         }
 970 #endif
 971                         get_name(dentptr, s_name);
 972
 973                         if (dols == LS_ROOT) {
 974                                 int isdir = (dentptr->attr & ATTR_DIR);
 975                                 char dirc;
 976                                 int doit = 0;
 977
 978                                 if (isdir) {
 979                                         dirc = '/';
 980                                         if (s_name[0] != 0) {
 981                                                 dirs++;
 982                                                 doit = 1;
 983                                         }
 984                                 } else {
 985                                         dirc = ' ';
 986                                         if (s_name[0] != 0) {
 987                                                 files++;
 988                                                 doit = 1;
 989                                         }
 990                                 }
 991                                 if (doit) {
 992                                         if (dirc == ' ') {
 993                                                 printf(" %8ld   %s%c\n",
 994                                                         (long)FAT2CPU32(dentptr->size),
 995                                                         s_name, dirc);
 996                                         } else {
 997                                                 printf("            %s%c\n",
 998                                                         s_name, dirc);
 999                                         }
1000                                 }
1001                                 dentptr++;
1002                                 continue;
1003                         }
1004
1005                         if (strcmp(fnamecopy, s_name)
1006                             && strcmp(fnamecopy, l_name)) {
1007                                 debug("RootMismatch: |%s|%s|\n", s_name,
1008                                        l_name);
1009                                 dentptr++;
1010                                 continue;
1011                         }
1012
1013                         if (isdir && !(dentptr->attr & ATTR_DIR))
1014                                 goto exit;
1015
1016                         debug("RootName: %s", s_name);
1017                         debug(", start: 0x%x", START(dentptr));
1018                         debug(", size:  0x%x %s\n",
1019                                FAT2CPU32(dentptr->size),
1020                                isdir ? "(DIR)" : "");
1021
1022                         goto rootdir_done;      /* We got a match */
1023                 }
1024                 debug("END LOOP: j=%d   clust_size=%d\n", j,
1025                        mydata->clust_size);
1026
1027                 /*
1028                  * On FAT32 we must fetch the FAT entries for the next
1029                  * root directory clusters when a cluster has been
1030                  * completely processed.
1031                  */
1032                 ++j;
1033                 int rootdir_end = 0;
1034                 if (mydata->fatsize == 32) {
1035                         if (j == mydata->clust_size) {
1036                                 int nxtsect = 0;
1037                                 int nxt_clust = 0;
1038
1039                                 nxt_clust = get_fatent(mydata, root_cluster);
1040                                 rootdir_end = CHECK_CLUST(nxt_clust, 32);
1041
1042                                 nxtsect = mydata->data_begin +
1043                                         (nxt_clust * mydata->clust_size);
1044
1045                                 root_cluster = nxt_clust;
1046
1047                                 cursect = nxtsect;
1048                                 j = 0;
1049                         }
1050                 } else {
1051                         if (j == PREFETCH_BLOCKS)
1052                                 j = 0;
1053
1054                         rootdir_end = (++cursect - mydata->rootdir_sect >=
1055                                        rootdir_size);
1056                 }
1057
1058                 /* If end of rootdir reached */
1059                 if (rootdir_end) {
1060                         if (dols == LS_ROOT) {
1061                                 printf("\n%d file(s), %d dir(s)\n\n",
1062                                        files, dirs);
1063                                 ret = 0;
1064                         }
1065                         goto exit;
1066                 }
1067         }
1068 rootdir_done:
1069
1070         firsttime = 1;
1071
1072         while (isdir) {
1073                 int startsect = mydata->data_begin
1074                         + START(dentptr) * mydata->clust_size;
1075                 dir_entry dent;
1076                 char *nextname = NULL;
1077
1078                 dent = *dentptr;
1079                 dentptr = &dent;
1080
1081                 idx = dirdelim(subname);
1082
1083                 if (idx >= 0) {
1084                         subname[idx] = '\0';
1085                         nextname = subname + idx + 1;
1086                         /* Handle multiple delimiters */
1087                         while (ISDIRDELIM(*nextname))
1088                                 nextname++;
1089                         if (dols && *nextname == '\0')
1090                                 firsttime = 0;
1091                 } else {
1092                         if (dols && firsttime) {
1093                                 firsttime = 0;
1094                         } else {
1095                                 isdir = 0;
1096                         }
1097                 }
1098
1099                 if (get_dentfromdir(mydata, startsect, subname, dentptr,
1100                                      isdir ? 0 : dols) == NULL) {
1101                         if (dols && !isdir)
1102                                 ret = 0;
1103                         goto exit;
1104                 }
1105
1106                 if (idx >= 0) {
1107                         if (!(dentptr->attr & ATTR_DIR))
1108                                 goto exit;
1109                         subname = nextname;
1110                 }
1111         }
1112
1113         ret = get_contents(mydata, dentptr, buffer, maxsize);
1114         debug("Size: %d, got: %ld\n", FAT2CPU32(dentptr->size), ret);
1115
1116 exit:
1117         free(mydata->fatbuf);
1118         return ret;
1119 }
1120
1121 int file_fat_detectfs(void)
1122 {
1123         boot_sector bs;
1124         volume_info volinfo;
1125         int fatsize;
1126         char vol_label[12];
1127
1128         if (cur_dev == NULL) {
1129                 printf("No current device\n");
1130                 return 1;
1131         }
1132
1133 #if defined(CONFIG_CMD_IDE) || \
1134     defined(CONFIG_CMD_SATA) || \
1135     defined(CONFIG_CMD_SCSI) || \
1136     defined(CONFIG_CMD_USB) || \
1137     defined(CONFIG_MMC)
1138         printf("Interface:  ");
1139         switch (cur_dev->if_type) {
1140         case IF_TYPE_IDE:
1141                 printf("IDE");
1142                 break;
1143         case IF_TYPE_SATA:
1144                 printf("SATA");
1145                 break;
1146         case IF_TYPE_SCSI:
1147                 printf("SCSI");
1148                 break;
1149         case IF_TYPE_ATAPI:
1150                 printf("ATAPI");
1151                 break;
1152         case IF_TYPE_USB:
1153                 printf("USB");
1154                 break;
1155         case IF_TYPE_DOC:
1156                 printf("DOC");
1157                 break;
1158         case IF_TYPE_MMC:
1159                 printf("MMC");
1160                 break;
1161         default:
1162                 printf("Unknown");
1163         }
1164
1165         printf("\n  Device %d: ", cur_dev->dev);
1166         dev_print(cur_dev);
1167 #endif
1168
1169         if (read_bootsectandvi(&bs, &volinfo, &fatsize)) {
1170                 printf("\nNo valid FAT fs found\n");
1171                 return 1;
1172         }
1173
1174         memcpy(vol_label, volinfo.volume_label, 11);
1175         vol_label[11] = '\0';
1176         volinfo.fs_type[5] = '\0';
1177
1178         printf("Partition %d: Filesystem: %s \"%s\"\n", cur_part_nr,
1179                 volinfo.fs_type, vol_label);
1180
1181         return 0;
1182 }
1183
1184 int file_fat_ls(const char *dir)
1185 {
1186         return do_fat_read(dir, NULL, 0, LS_YES);
1187 }
1188
1189 long file_fat_read(const char *filename, void *buffer, unsigned long maxsize)
1190 {
1191         printf("reading %s\n", filename);
1192         return do_fat_read(filename, buffer, maxsize, LS_NO);
1193 }