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 35 /* 36 * Convert a string to lowercase. 37 */ 38 static void downcase (char *str) 39 { 40 while (*str != '\0') { 41 TOLOWER(*str); 42 str++; 43 } 44 } 45 46 static block_dev_desc_t *cur_dev = NULL; 47 48 static unsigned long part_offset = 0; 49 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 #define DOS_FS32_TYPE_OFFSET 0x52 56 57 static int disk_read (__u32 startblock, __u32 getsize, __u8 * bufptr) 58 { 59 if (cur_dev == NULL) 60 return -1; 61 62 startblock += part_offset; 63 64 if (cur_dev->block_read) { 65 return cur_dev->block_read(cur_dev->dev, startblock, getsize, 66 (unsigned long *) bufptr); 67 } 68 return -1; 69 } 70 71 int fat_register_device (block_dev_desc_t * dev_desc, int part_no) 72 { 73 unsigned char buffer[dev_desc->blksz]; 74 disk_partition_t info; 75 76 if (!dev_desc->block_read) 77 return -1; 78 79 cur_dev = dev_desc; 80 /* check if we have a MBR (on floppies we have only a PBR) */ 81 if (dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *)buffer) != 1) { 82 printf("** Can't read from device %d **\n", 83 dev_desc->dev); 84 return -1; 85 } 86 if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 || 87 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) { 88 /* no signature found */ 89 return -1; 90 } 91 #if (defined(CONFIG_CMD_IDE) || \ 92 defined(CONFIG_CMD_MG_DISK) || \ 93 defined(CONFIG_CMD_SATA) || \ 94 defined(CONFIG_CMD_SCSI) || \ 95 defined(CONFIG_CMD_USB) || \ 96 defined(CONFIG_MMC) || \ 97 defined(CONFIG_SYSTEMACE) ) 98 /* First we assume there is a MBR */ 99 if (!get_partition_info(dev_desc, part_no, &info)) { 100 part_offset = info.start; 101 cur_part = part_no; 102 } else if ((strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET], "FAT", 3) == 0) || 103 (strncmp((char *)&buffer[DOS_FS32_TYPE_OFFSET], "FAT32", 5) == 0)) { 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", 109 part_no, dev_desc->dev); 110 return -1; 111 } 112 113 #else 114 if ((strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET], "FAT", 3) == 0) || 115 (strncmp((char *)&buffer[DOS_FS32_TYPE_OFFSET], "FAT32", 5) == 0)) { 116 /* ok, we assume we are on a PBR only */ 117 cur_part = 1; 118 part_offset = 0; 119 info.start = part_offset; 120 } else { 121 /* FIXME we need to determine the start block of the 122 * partition where the DOS FS resides. This can be done 123 * by using the get_partition_info routine. For this 124 * purpose the libpart must be included. 125 */ 126 part_offset = 32; 127 cur_part = 1; 128 } 129 #endif 130 return 0; 131 } 132 133 /* 134 * Get the first occurence of a directory delimiter ('/' or '\') in a string. 135 * Return index into string if found, -1 otherwise. 136 */ 137 static int dirdelim (char *str) 138 { 139 char *start = str; 140 141 while (*str != '\0') { 142 if (ISDIRDELIM(*str)) 143 return str - start; 144 str++; 145 } 146 return -1; 147 } 148 149 /* 150 * Extract zero terminated short name from a directory entry. 151 */ 152 static void get_name (dir_entry *dirent, char *s_name) 153 { 154 char *ptr; 155 156 memcpy(s_name, dirent->name, 8); 157 s_name[8] = '\0'; 158 ptr = s_name; 159 while (*ptr && *ptr != ' ') 160 ptr++; 161 if (dirent->ext[0] && dirent->ext[0] != ' ') { 162 *ptr = '.'; 163 ptr++; 164 memcpy(ptr, dirent->ext, 3); 165 ptr[3] = '\0'; 166 while (*ptr && *ptr != ' ') 167 ptr++; 168 } 169 *ptr = '\0'; 170 if (*s_name == DELETED_FLAG) 171 *s_name = '\0'; 172 else if (*s_name == aRING) 173 *s_name = DELETED_FLAG; 174 downcase(s_name); 175 } 176 177 /* 178 * Get the entry at index 'entry' in a FAT (12/16/32) table. 179 * On failure 0x00 is returned. 180 */ 181 static __u32 get_fatent (fsdata *mydata, __u32 entry) 182 { 183 __u32 bufnum; 184 __u32 off16, offset; 185 __u32 ret = 0x00; 186 __u16 val1, val2; 187 188 switch (mydata->fatsize) { 189 case 32: 190 bufnum = entry / FAT32BUFSIZE; 191 offset = entry - bufnum * FAT32BUFSIZE; 192 break; 193 case 16: 194 bufnum = entry / FAT16BUFSIZE; 195 offset = entry - bufnum * FAT16BUFSIZE; 196 break; 197 case 12: 198 bufnum = entry / FAT12BUFSIZE; 199 offset = entry - bufnum * FAT12BUFSIZE; 200 break; 201 202 default: 203 /* Unsupported FAT size */ 204 return ret; 205 } 206 207 debug("FAT%d: entry: 0x%04x = %d, offset: 0x%04x = %d\n", 208 mydata->fatsize, entry, entry, offset, offset); 209 210 /* Read a new block of FAT entries into the cache. */ 211 if (bufnum != mydata->fatbufnum) { 212 __u32 getsize = FATBUFBLOCKS; 213 __u8 *bufptr = mydata->fatbuf; 214 __u32 fatlength = mydata->fatlength; 215 __u32 startblock = bufnum * FATBUFBLOCKS; 216 217 if (getsize > fatlength) 218 getsize = fatlength; 219 220 fatlength *= mydata->sect_size; /* We want it in bytes now */ 221 startblock += mydata->fat_sect; /* Offset from start of disk */ 222 223 if (disk_read(startblock, getsize, bufptr) < 0) { 224 debug("Error reading FAT blocks\n"); 225 return ret; 226 } 227 mydata->fatbufnum = bufnum; 228 } 229 230 /* Get the actual entry from the table */ 231 switch (mydata->fatsize) { 232 case 32: 233 ret = FAT2CPU32(((__u32 *) mydata->fatbuf)[offset]); 234 break; 235 case 16: 236 ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[offset]); 237 break; 238 case 12: 239 off16 = (offset * 3) / 4; 240 241 switch (offset & 0x3) { 242 case 0: 243 ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[off16]); 244 ret &= 0xfff; 245 break; 246 case 1: 247 val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]); 248 val1 &= 0xf000; 249 val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]); 250 val2 &= 0x00ff; 251 ret = (val2 << 4) | (val1 >> 12); 252 break; 253 case 2: 254 val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]); 255 val1 &= 0xff00; 256 val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]); 257 val2 &= 0x000f; 258 ret = (val2 << 8) | (val1 >> 8); 259 break; 260 case 3: 261 ret = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]); 262 ret = (ret & 0xfff0) >> 4; 263 break; 264 default: 265 break; 266 } 267 break; 268 } 269 debug("FAT%d: ret: %08x, offset: %04x\n", 270 mydata->fatsize, ret, offset); 271 272 return ret; 273 } 274 275 /* 276 * Read at most 'size' bytes from the specified cluster into 'buffer'. 277 * Return 0 on success, -1 otherwise. 278 */ 279 static int 280 get_cluster (fsdata *mydata, __u32 clustnum, __u8 *buffer, 281 unsigned long size) 282 { 283 __u32 idx = 0; 284 __u32 startsect; 285 286 if (clustnum > 0) { 287 startsect = mydata->data_begin + 288 clustnum * mydata->clust_size; 289 } else { 290 startsect = mydata->rootdir_sect; 291 } 292 293 debug("gc - clustnum: %d, startsect: %d\n", clustnum, startsect); 294 295 if (disk_read(startsect, size / mydata->sect_size, buffer) < 0) { 296 debug("Error reading data\n"); 297 return -1; 298 } 299 if (size % mydata->sect_size) { 300 __u8 tmpbuf[mydata->sect_size]; 301 302 idx = size / mydata->sect_size; 303 if (disk_read(startsect + idx, 1, tmpbuf) < 0) { 304 debug("Error reading data\n"); 305 return -1; 306 } 307 buffer += idx * mydata->sect_size; 308 309 memcpy(buffer, tmpbuf, size % mydata->sect_size); 310 return 0; 311 } 312 313 return 0; 314 } 315 316 /* 317 * Read at most 'maxsize' bytes from the file associated with 'dentptr' 318 * into 'buffer'. 319 * Return the number of bytes read or -1 on fatal errors. 320 */ 321 static long 322 get_contents (fsdata *mydata, dir_entry *dentptr, __u8 *buffer, 323 unsigned long maxsize) 324 { 325 unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0; 326 unsigned int bytesperclust = mydata->clust_size * mydata->sect_size; 327 __u32 curclust = START(dentptr); 328 __u32 endclust, newclust; 329 unsigned long actsize; 330 331 debug("Filesize: %ld bytes\n", filesize); 332 333 if (maxsize > 0 && filesize > maxsize) 334 filesize = maxsize; 335 336 debug("%ld bytes\n", filesize); 337 338 actsize = bytesperclust; 339 endclust = curclust; 340 341 do { 342 /* search for consecutive clusters */ 343 while (actsize < filesize) { 344 newclust = get_fatent(mydata, endclust); 345 if ((newclust - 1) != endclust) 346 goto getit; 347 if (CHECK_CLUST(newclust, mydata->fatsize)) { 348 debug("curclust: 0x%x\n", newclust); 349 debug("Invalid FAT entry\n"); 350 return gotsize; 351 } 352 endclust = newclust; 353 actsize += bytesperclust; 354 } 355 356 /* actsize >= file size */ 357 actsize -= bytesperclust; 358 359 /* get remaining clusters */ 360 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 361 printf("Error reading cluster\n"); 362 return -1; 363 } 364 365 /* get remaining bytes */ 366 gotsize += (int)actsize; 367 filesize -= actsize; 368 buffer += actsize; 369 actsize = filesize; 370 if (get_cluster(mydata, endclust, buffer, (int)actsize) != 0) { 371 printf("Error reading cluster\n"); 372 return -1; 373 } 374 gotsize += actsize; 375 return gotsize; 376 getit: 377 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 378 printf("Error reading cluster\n"); 379 return -1; 380 } 381 gotsize += (int)actsize; 382 filesize -= actsize; 383 buffer += actsize; 384 385 curclust = get_fatent(mydata, endclust); 386 if (CHECK_CLUST(curclust, mydata->fatsize)) { 387 debug("curclust: 0x%x\n", curclust); 388 printf("Invalid FAT entry\n"); 389 return gotsize; 390 } 391 actsize = bytesperclust; 392 endclust = curclust; 393 } while (1); 394 } 395 396 #ifdef CONFIG_SUPPORT_VFAT 397 /* 398 * Extract the file name information from 'slotptr' into 'l_name', 399 * starting at l_name[*idx]. 400 * Return 1 if terminator (zero byte) is found, 0 otherwise. 401 */ 402 static int slot2str (dir_slot *slotptr, char *l_name, int *idx) 403 { 404 int j; 405 406 for (j = 0; j <= 8; j += 2) { 407 l_name[*idx] = slotptr->name0_4[j]; 408 if (l_name[*idx] == 0x00) 409 return 1; 410 (*idx)++; 411 } 412 for (j = 0; j <= 10; j += 2) { 413 l_name[*idx] = slotptr->name5_10[j]; 414 if (l_name[*idx] == 0x00) 415 return 1; 416 (*idx)++; 417 } 418 for (j = 0; j <= 2; j += 2) { 419 l_name[*idx] = slotptr->name11_12[j]; 420 if (l_name[*idx] == 0x00) 421 return 1; 422 (*idx)++; 423 } 424 425 return 0; 426 } 427 428 /* 429 * Extract the full long filename starting at 'retdent' (which is really 430 * a slot) into 'l_name'. If successful also copy the real directory entry 431 * into 'retdent' 432 * Return 0 on success, -1 otherwise. 433 */ 434 __attribute__ ((__aligned__ (__alignof__ (dir_entry)))) 435 __u8 get_vfatname_block[MAX_CLUSTSIZE]; 436 437 static int 438 get_vfatname (fsdata *mydata, int curclust, __u8 *cluster, 439 dir_entry *retdent, char *l_name) 440 { 441 dir_entry *realdent; 442 dir_slot *slotptr = (dir_slot *)retdent; 443 __u8 *buflimit = cluster + mydata->sect_size * ((curclust == 0) ? 444 PREFETCH_BLOCKS : 445 mydata->clust_size); 446 __u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff; 447 int idx = 0; 448 449 if (counter > VFAT_MAXSEQ) { 450 debug("Error: VFAT name is too long\n"); 451 return -1; 452 } 453 454 while ((__u8 *)slotptr < buflimit) { 455 if (counter == 0) 456 break; 457 if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter) 458 return -1; 459 slotptr++; 460 counter--; 461 } 462 463 if ((__u8 *)slotptr >= buflimit) { 464 dir_slot *slotptr2; 465 466 if (curclust == 0) 467 return -1; 468 curclust = get_fatent(mydata, curclust); 469 if (CHECK_CLUST(curclust, mydata->fatsize)) { 470 debug("curclust: 0x%x\n", curclust); 471 printf("Invalid FAT entry\n"); 472 return -1; 473 } 474 475 if (get_cluster(mydata, curclust, get_vfatname_block, 476 mydata->clust_size * mydata->sect_size) != 0) { 477 debug("Error: reading directory block\n"); 478 return -1; 479 } 480 481 slotptr2 = (dir_slot *)get_vfatname_block; 482 while (counter > 0) { 483 if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK) 484 & 0xff) != counter) 485 return -1; 486 slotptr2++; 487 counter--; 488 } 489 490 /* Save the real directory entry */ 491 realdent = (dir_entry *)slotptr2; 492 while ((__u8 *)slotptr2 > get_vfatname_block) { 493 slotptr2--; 494 slot2str(slotptr2, l_name, &idx); 495 } 496 } else { 497 /* Save the real directory entry */ 498 realdent = (dir_entry *)slotptr; 499 } 500 501 do { 502 slotptr--; 503 if (slot2str(slotptr, l_name, &idx)) 504 break; 505 } while (!(slotptr->id & LAST_LONG_ENTRY_MASK)); 506 507 l_name[idx] = '\0'; 508 if (*l_name == DELETED_FLAG) 509 *l_name = '\0'; 510 else if (*l_name == aRING) 511 *l_name = DELETED_FLAG; 512 downcase(l_name); 513 514 /* Return the real directory entry */ 515 memcpy(retdent, realdent, sizeof(dir_entry)); 516 517 return 0; 518 } 519 520 /* Calculate short name checksum */ 521 static __u8 mkcksum (const char *str) 522 { 523 int i; 524 525 __u8 ret = 0; 526 527 for (i = 0; i < 11; i++) { 528 ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + str[i]; 529 } 530 531 return ret; 532 } 533 #endif /* CONFIG_SUPPORT_VFAT */ 534 535 /* 536 * Get the directory entry associated with 'filename' from the directory 537 * starting at 'startsect' 538 */ 539 __attribute__ ((__aligned__ (__alignof__ (dir_entry)))) 540 __u8 get_dentfromdir_block[MAX_CLUSTSIZE]; 541 542 static dir_entry *get_dentfromdir (fsdata *mydata, int startsect, 543 char *filename, dir_entry *retdent, 544 int dols) 545 { 546 __u16 prevcksum = 0xffff; 547 __u32 curclust = START(retdent); 548 int files = 0, dirs = 0; 549 550 debug("get_dentfromdir: %s\n", filename); 551 552 while (1) { 553 dir_entry *dentptr; 554 555 int i; 556 557 if (get_cluster(mydata, curclust, get_dentfromdir_block, 558 mydata->clust_size * mydata->sect_size) != 0) { 559 debug("Error: reading directory block\n"); 560 return NULL; 561 } 562 563 dentptr = (dir_entry *)get_dentfromdir_block; 564 565 for (i = 0; i < DIRENTSPERCLUST; i++) { 566 char s_name[14], l_name[VFAT_MAXLEN_BYTES]; 567 568 l_name[0] = '\0'; 569 if (dentptr->name[0] == DELETED_FLAG) { 570 dentptr++; 571 continue; 572 } 573 if ((dentptr->attr & ATTR_VOLUME)) { 574 #ifdef CONFIG_SUPPORT_VFAT 575 if ((dentptr->attr & ATTR_VFAT) == ATTR_VFAT && 576 (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) { 577 prevcksum = ((dir_slot *)dentptr)->alias_checksum; 578 get_vfatname(mydata, curclust, 579 get_dentfromdir_block, 580 dentptr, l_name); 581 if (dols) { 582 int isdir; 583 char dirc; 584 int doit = 0; 585 586 isdir = (dentptr->attr & ATTR_DIR); 587 588 if (isdir) { 589 dirs++; 590 dirc = '/'; 591 doit = 1; 592 } else { 593 dirc = ' '; 594 if (l_name[0] != 0) { 595 files++; 596 doit = 1; 597 } 598 } 599 if (doit) { 600 if (dirc == ' ') { 601 printf(" %8ld %s%c\n", 602 (long)FAT2CPU32(dentptr->size), 603 l_name, 604 dirc); 605 } else { 606 printf(" %s%c\n", 607 l_name, 608 dirc); 609 } 610 } 611 dentptr++; 612 continue; 613 } 614 debug("vfatname: |%s|\n", l_name); 615 } else 616 #endif 617 { 618 /* Volume label or VFAT entry */ 619 dentptr++; 620 continue; 621 } 622 } 623 if (dentptr->name[0] == 0) { 624 if (dols) { 625 printf("\n%d file(s), %d dir(s)\n\n", 626 files, dirs); 627 } 628 debug("Dentname == NULL - %d\n", i); 629 return NULL; 630 } 631 #ifdef CONFIG_SUPPORT_VFAT 632 if (dols && mkcksum(dentptr->name) == prevcksum) { 633 dentptr++; 634 continue; 635 } 636 #endif 637 get_name(dentptr, s_name); 638 if (dols) { 639 int isdir = (dentptr->attr & ATTR_DIR); 640 char dirc; 641 int doit = 0; 642 643 if (isdir) { 644 dirs++; 645 dirc = '/'; 646 doit = 1; 647 } else { 648 dirc = ' '; 649 if (s_name[0] != 0) { 650 files++; 651 doit = 1; 652 } 653 } 654 655 if (doit) { 656 if (dirc == ' ') { 657 printf(" %8ld %s%c\n", 658 (long)FAT2CPU32(dentptr->size), 659 s_name, dirc); 660 } else { 661 printf(" %s%c\n", 662 s_name, dirc); 663 } 664 } 665 666 dentptr++; 667 continue; 668 } 669 670 if (strcmp(filename, s_name) 671 && strcmp(filename, l_name)) { 672 debug("Mismatch: |%s|%s|\n", s_name, l_name); 673 dentptr++; 674 continue; 675 } 676 677 memcpy(retdent, dentptr, sizeof(dir_entry)); 678 679 debug("DentName: %s", s_name); 680 debug(", start: 0x%x", START(dentptr)); 681 debug(", size: 0x%x %s\n", 682 FAT2CPU32(dentptr->size), 683 (dentptr->attr & ATTR_DIR) ? "(DIR)" : ""); 684 685 return retdent; 686 } 687 688 curclust = get_fatent(mydata, curclust); 689 if (CHECK_CLUST(curclust, mydata->fatsize)) { 690 debug("curclust: 0x%x\n", curclust); 691 printf("Invalid FAT entry\n"); 692 return NULL; 693 } 694 } 695 696 return NULL; 697 } 698 699 /* 700 * Read boot sector and volume info from a FAT filesystem 701 */ 702 static int 703 read_bootsectandvi (boot_sector *bs, volume_info *volinfo, int *fatsize) 704 { 705 __u8 *block; 706 volume_info *vistart; 707 int ret = 0; 708 709 if (cur_dev == NULL) { 710 debug("Error: no device selected\n"); 711 return -1; 712 } 713 714 block = malloc(cur_dev->blksz); 715 if (block == NULL) { 716 debug("Error: allocating block\n"); 717 return -1; 718 } 719 720 if (disk_read (0, 1, block) < 0) { 721 debug("Error: reading block\n"); 722 goto fail; 723 } 724 725 memcpy(bs, block, sizeof(boot_sector)); 726 bs->reserved = FAT2CPU16(bs->reserved); 727 bs->fat_length = FAT2CPU16(bs->fat_length); 728 bs->secs_track = FAT2CPU16(bs->secs_track); 729 bs->heads = FAT2CPU16(bs->heads); 730 bs->total_sect = FAT2CPU32(bs->total_sect); 731 732 /* FAT32 entries */ 733 if (bs->fat_length == 0) { 734 /* Assume FAT32 */ 735 bs->fat32_length = FAT2CPU32(bs->fat32_length); 736 bs->flags = FAT2CPU16(bs->flags); 737 bs->root_cluster = FAT2CPU32(bs->root_cluster); 738 bs->info_sector = FAT2CPU16(bs->info_sector); 739 bs->backup_boot = FAT2CPU16(bs->backup_boot); 740 vistart = (volume_info *)(block + sizeof(boot_sector)); 741 *fatsize = 32; 742 } else { 743 vistart = (volume_info *)&(bs->fat32_length); 744 *fatsize = 0; 745 } 746 memcpy(volinfo, vistart, sizeof(volume_info)); 747 748 if (*fatsize == 32) { 749 if (strncmp(FAT32_SIGN, vistart->fs_type, SIGNLEN) == 0) 750 goto exit; 751 } else { 752 if (strncmp(FAT12_SIGN, vistart->fs_type, SIGNLEN) == 0) { 753 *fatsize = 12; 754 goto exit; 755 } 756 if (strncmp(FAT16_SIGN, vistart->fs_type, SIGNLEN) == 0) { 757 *fatsize = 16; 758 goto exit; 759 } 760 } 761 762 debug("Error: broken fs_type sign\n"); 763 fail: 764 ret = -1; 765 exit: 766 free(block); 767 return ret; 768 } 769 770 __attribute__ ((__aligned__ (__alignof__ (dir_entry)))) 771 __u8 do_fat_read_block[MAX_CLUSTSIZE]; 772 773 long 774 do_fat_read (const char *filename, void *buffer, unsigned long maxsize, 775 int dols) 776 { 777 char fnamecopy[2048]; 778 boot_sector bs; 779 volume_info volinfo; 780 fsdata datablock; 781 fsdata *mydata = &datablock; 782 dir_entry *dentptr; 783 __u16 prevcksum = 0xffff; 784 char *subname = ""; 785 __u32 cursect; 786 int idx, isdir = 0; 787 int files = 0, dirs = 0; 788 long ret = -1; 789 int firsttime; 790 __u32 root_cluster = 0; 791 int rootdir_size = 0; 792 int j; 793 794 if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) { 795 debug("Error: reading boot sector\n"); 796 return -1; 797 } 798 799 if (mydata->fatsize == 32) { 800 root_cluster = bs.root_cluster; 801 mydata->fatlength = bs.fat32_length; 802 } else { 803 mydata->fatlength = bs.fat_length; 804 } 805 806 mydata->fat_sect = bs.reserved; 807 808 cursect = mydata->rootdir_sect 809 = mydata->fat_sect + mydata->fatlength * bs.fats; 810 811 mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0]; 812 mydata->clust_size = bs.cluster_size; 813 814 if (mydata->fatsize == 32) { 815 mydata->data_begin = mydata->rootdir_sect - 816 (mydata->clust_size * 2); 817 } else { 818 rootdir_size = ((bs.dir_entries[1] * (int)256 + 819 bs.dir_entries[0]) * 820 sizeof(dir_entry)) / 821 mydata->sect_size; 822 mydata->data_begin = mydata->rootdir_sect + 823 rootdir_size - 824 (mydata->clust_size * 2); 825 } 826 827 mydata->fatbufnum = -1; 828 mydata->fatbuf = malloc(FATBUFSIZE); 829 if (mydata->fatbuf == NULL) { 830 debug("Error: allocating memory\n"); 831 return -1; 832 } 833 834 #ifdef CONFIG_SUPPORT_VFAT 835 debug("VFAT Support enabled\n"); 836 #endif 837 debug("FAT%d, fat_sect: %d, fatlength: %d\n", 838 mydata->fatsize, mydata->fat_sect, mydata->fatlength); 839 debug("Rootdir begins at cluster: %d, sector: %d, offset: %x\n" 840 "Data begins at: %d\n", 841 root_cluster, 842 mydata->rootdir_sect, 843 mydata->rootdir_sect * mydata->sect_size, mydata->data_begin); 844 debug("Sector size: %d, cluster size: %d\n", mydata->sect_size, 845 mydata->clust_size); 846 847 /* "cwd" is always the root... */ 848 while (ISDIRDELIM(*filename)) 849 filename++; 850 851 /* Make a copy of the filename and convert it to lowercase */ 852 strcpy(fnamecopy, filename); 853 downcase(fnamecopy); 854 855 if (*fnamecopy == '\0') { 856 if (!dols) 857 goto exit; 858 859 dols = LS_ROOT; 860 } else if ((idx = dirdelim(fnamecopy)) >= 0) { 861 isdir = 1; 862 fnamecopy[idx] = '\0'; 863 subname = fnamecopy + idx + 1; 864 865 /* Handle multiple delimiters */ 866 while (ISDIRDELIM(*subname)) 867 subname++; 868 } else if (dols) { 869 isdir = 1; 870 } 871 872 j = 0; 873 while (1) { 874 int i; 875 876 debug("FAT read sect=%d, clust_size=%d, DIRENTSPERBLOCK=%d\n", 877 cursect, mydata->clust_size, DIRENTSPERBLOCK); 878 879 if (disk_read(cursect, 880 (mydata->fatsize == 32) ? 881 (mydata->clust_size) : 882 PREFETCH_BLOCKS, 883 do_fat_read_block) < 0) { 884 debug("Error: reading rootdir block\n"); 885 goto exit; 886 } 887 888 dentptr = (dir_entry *) do_fat_read_block; 889 890 for (i = 0; i < DIRENTSPERBLOCK; i++) { 891 char s_name[14], l_name[VFAT_MAXLEN_BYTES]; 892 893 l_name[0] = '\0'; 894 if (dentptr->name[0] == DELETED_FLAG) { 895 dentptr++; 896 continue; 897 } 898 if ((dentptr->attr & ATTR_VOLUME)) { 899 #ifdef CONFIG_SUPPORT_VFAT 900 if ((dentptr->attr & ATTR_VFAT) == ATTR_VFAT && 901 (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) { 902 prevcksum = 903 ((dir_slot *)dentptr)->alias_checksum; 904 905 get_vfatname(mydata, 906 root_cluster, 907 do_fat_read_block, 908 dentptr, l_name); 909 910 if (dols == LS_ROOT) { 911 char dirc; 912 int doit = 0; 913 int isdir = 914 (dentptr->attr & ATTR_DIR); 915 916 if (isdir) { 917 dirs++; 918 dirc = '/'; 919 doit = 1; 920 } else { 921 dirc = ' '; 922 if (l_name[0] != 0) { 923 files++; 924 doit = 1; 925 } 926 } 927 if (doit) { 928 if (dirc == ' ') { 929 printf(" %8ld %s%c\n", 930 (long)FAT2CPU32(dentptr->size), 931 l_name, 932 dirc); 933 } else { 934 printf(" %s%c\n", 935 l_name, 936 dirc); 937 } 938 } 939 dentptr++; 940 continue; 941 } 942 debug("Rootvfatname: |%s|\n", 943 l_name); 944 } else 945 #endif 946 { 947 /* Volume label or VFAT entry */ 948 dentptr++; 949 continue; 950 } 951 } else if (dentptr->name[0] == 0) { 952 debug("RootDentname == NULL - %d\n", i); 953 if (dols == LS_ROOT) { 954 printf("\n%d file(s), %d dir(s)\n\n", 955 files, dirs); 956 ret = 0; 957 } 958 goto exit; 959 } 960 #ifdef CONFIG_SUPPORT_VFAT 961 else if (dols == LS_ROOT && 962 mkcksum(dentptr->name) == prevcksum) { 963 dentptr++; 964 continue; 965 } 966 #endif 967 get_name(dentptr, s_name); 968 969 if (dols == LS_ROOT) { 970 int isdir = (dentptr->attr & ATTR_DIR); 971 char dirc; 972 int doit = 0; 973 974 if (isdir) { 975 dirc = '/'; 976 if (s_name[0] != 0) { 977 dirs++; 978 doit = 1; 979 } 980 } else { 981 dirc = ' '; 982 if (s_name[0] != 0) { 983 files++; 984 doit = 1; 985 } 986 } 987 if (doit) { 988 if (dirc == ' ') { 989 printf(" %8ld %s%c\n", 990 (long)FAT2CPU32(dentptr->size), 991 s_name, dirc); 992 } else { 993 printf(" %s%c\n", 994 s_name, dirc); 995 } 996 } 997 dentptr++; 998 continue; 999 } 1000 1001 if (strcmp(fnamecopy, s_name) 1002 && strcmp(fnamecopy, l_name)) { 1003 debug("RootMismatch: |%s|%s|\n", s_name, 1004 l_name); 1005 dentptr++; 1006 continue; 1007 } 1008 1009 if (isdir && !(dentptr->attr & ATTR_DIR)) 1010 goto exit; 1011 1012 debug("RootName: %s", s_name); 1013 debug(", start: 0x%x", START(dentptr)); 1014 debug(", size: 0x%x %s\n", 1015 FAT2CPU32(dentptr->size), 1016 isdir ? "(DIR)" : ""); 1017 1018 goto rootdir_done; /* We got a match */ 1019 } 1020 debug("END LOOP: j=%d clust_size=%d\n", j, 1021 mydata->clust_size); 1022 1023 /* 1024 * On FAT32 we must fetch the FAT entries for the next 1025 * root directory clusters when a cluster has been 1026 * completely processed. 1027 */ 1028 ++j; 1029 int fat32_end = 0; 1030 if ((mydata->fatsize == 32) && (j == mydata->clust_size)) { 1031 int nxtsect = 0; 1032 int nxt_clust = 0; 1033 1034 nxt_clust = get_fatent(mydata, root_cluster); 1035 fat32_end = CHECK_CLUST(nxt_clust, 32); 1036 1037 nxtsect = mydata->data_begin + 1038 (nxt_clust * mydata->clust_size); 1039 1040 root_cluster = nxt_clust; 1041 1042 cursect = nxtsect; 1043 j = 0; 1044 } else { 1045 cursect++; 1046 } 1047 1048 /* If end of rootdir reached */ 1049 if ((mydata->fatsize == 32 && fat32_end) || 1050 (mydata->fatsize != 32 && j == rootdir_size)) { 1051 if (dols == LS_ROOT) { 1052 printf("\n%d file(s), %d dir(s)\n\n", 1053 files, dirs); 1054 ret = 0; 1055 } 1056 goto exit; 1057 } 1058 } 1059 rootdir_done: 1060 1061 firsttime = 1; 1062 1063 while (isdir) { 1064 int startsect = mydata->data_begin 1065 + START(dentptr) * mydata->clust_size; 1066 dir_entry dent; 1067 char *nextname = NULL; 1068 1069 dent = *dentptr; 1070 dentptr = &dent; 1071 1072 idx = dirdelim(subname); 1073 1074 if (idx >= 0) { 1075 subname[idx] = '\0'; 1076 nextname = subname + idx + 1; 1077 /* Handle multiple delimiters */ 1078 while (ISDIRDELIM(*nextname)) 1079 nextname++; 1080 if (dols && *nextname == '\0') 1081 firsttime = 0; 1082 } else { 1083 if (dols && firsttime) { 1084 firsttime = 0; 1085 } else { 1086 isdir = 0; 1087 } 1088 } 1089 1090 if (get_dentfromdir(mydata, startsect, subname, dentptr, 1091 isdir ? 0 : dols) == NULL) { 1092 if (dols && !isdir) 1093 ret = 0; 1094 goto exit; 1095 } 1096 1097 if (idx >= 0) { 1098 if (!(dentptr->attr & ATTR_DIR)) 1099 goto exit; 1100 subname = nextname; 1101 } 1102 } 1103 1104 ret = get_contents(mydata, dentptr, buffer, maxsize); 1105 debug("Size: %d, got: %ld\n", FAT2CPU32(dentptr->size), ret); 1106 1107 exit: 1108 free(mydata->fatbuf); 1109 return ret; 1110 } 1111 1112 int file_fat_detectfs (void) 1113 { 1114 boot_sector bs; 1115 volume_info volinfo; 1116 int fatsize; 1117 char vol_label[12]; 1118 1119 if (cur_dev == NULL) { 1120 printf("No current device\n"); 1121 return 1; 1122 } 1123 1124 #if defined(CONFIG_CMD_IDE) || \ 1125 defined(CONFIG_CMD_MG_DISK) || \ 1126 defined(CONFIG_CMD_SATA) || \ 1127 defined(CONFIG_CMD_SCSI) || \ 1128 defined(CONFIG_CMD_USB) || \ 1129 defined(CONFIG_MMC) 1130 printf("Interface: "); 1131 switch (cur_dev->if_type) { 1132 case IF_TYPE_IDE: 1133 printf("IDE"); 1134 break; 1135 case IF_TYPE_SATA: 1136 printf("SATA"); 1137 break; 1138 case IF_TYPE_SCSI: 1139 printf("SCSI"); 1140 break; 1141 case IF_TYPE_ATAPI: 1142 printf("ATAPI"); 1143 break; 1144 case IF_TYPE_USB: 1145 printf("USB"); 1146 break; 1147 case IF_TYPE_DOC: 1148 printf("DOC"); 1149 break; 1150 case IF_TYPE_MMC: 1151 printf("MMC"); 1152 break; 1153 default: 1154 printf("Unknown"); 1155 } 1156 1157 printf("\n Device %d: ", cur_dev->dev); 1158 dev_print(cur_dev); 1159 #endif 1160 1161 if (read_bootsectandvi(&bs, &volinfo, &fatsize)) { 1162 printf("\nNo valid FAT fs found\n"); 1163 return 1; 1164 } 1165 1166 memcpy(vol_label, volinfo.volume_label, 11); 1167 vol_label[11] = '\0'; 1168 volinfo.fs_type[5] = '\0'; 1169 1170 printf("Partition %d: Filesystem: %s \"%s\"\n", cur_part, 1171 volinfo.fs_type, vol_label); 1172 1173 return 0; 1174 } 1175 1176 int file_fat_ls (const char *dir) 1177 { 1178 return do_fat_read(dir, NULL, 0, LS_YES); 1179 } 1180 1181 long file_fat_read (const char *filename, void *buffer, unsigned long maxsize) 1182 { 1183 printf("reading %s\n", filename); 1184 return do_fat_read(filename, buffer, maxsize, LS_NO); 1185 } 1186