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 int ret; 277 278 if (clustnum > 0) { 279 startsect = mydata->data_begin + 280 clustnum * mydata->clust_size; 281 } else { 282 startsect = mydata->rootdir_sect; 283 } 284 285 debug("gc - clustnum: %d, startsect: %d\n", clustnum, startsect); 286 287 if ((unsigned long)buffer & (ARCH_DMA_MINALIGN - 1)) { 288 ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size); 289 290 printf("FAT: Misaligned buffer address (%p)\n", buffer); 291 292 while (size >= mydata->sect_size) { 293 ret = disk_read(startsect++, 1, tmpbuf); 294 if (ret != 1) { 295 debug("Error reading data (got %d)\n", ret); 296 return -1; 297 } 298 299 memcpy(buffer, tmpbuf, mydata->sect_size); 300 buffer += mydata->sect_size; 301 size -= mydata->sect_size; 302 } 303 } else { 304 idx = size / mydata->sect_size; 305 ret = disk_read(startsect, idx, buffer); 306 if (ret != idx) { 307 debug("Error reading data (got %d)\n", ret); 308 return -1; 309 } 310 startsect += idx; 311 idx *= mydata->sect_size; 312 buffer += idx; 313 size -= idx; 314 } 315 if (size) { 316 ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size); 317 318 ret = disk_read(startsect, 1, tmpbuf); 319 if (ret != 1) { 320 debug("Error reading data (got %d)\n", ret); 321 return -1; 322 } 323 324 memcpy(buffer, tmpbuf, size); 325 } 326 327 return 0; 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 * mydata->sect_size; 341 __u32 curclust = START(dentptr); 342 __u32 endclust, newclust; 343 unsigned long actsize; 344 345 debug("Filesize: %ld bytes\n", filesize); 346 347 if (maxsize > 0 && filesize > maxsize) 348 filesize = maxsize; 349 350 debug("%ld bytes\n", filesize); 351 352 actsize = bytesperclust; 353 endclust = curclust; 354 355 do { 356 /* search for consecutive clusters */ 357 while (actsize < filesize) { 358 newclust = get_fatent(mydata, endclust); 359 if ((newclust - 1) != endclust) 360 goto getit; 361 if (CHECK_CLUST(newclust, mydata->fatsize)) { 362 debug("curclust: 0x%x\n", newclust); 363 debug("Invalid FAT entry\n"); 364 return gotsize; 365 } 366 endclust = newclust; 367 actsize += bytesperclust; 368 } 369 370 /* get remaining bytes */ 371 actsize = filesize; 372 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 373 printf("Error reading cluster\n"); 374 return -1; 375 } 376 gotsize += actsize; 377 return gotsize; 378 getit: 379 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 380 printf("Error reading cluster\n"); 381 return -1; 382 } 383 gotsize += (int)actsize; 384 filesize -= actsize; 385 buffer += actsize; 386 387 curclust = get_fatent(mydata, endclust); 388 if (CHECK_CLUST(curclust, mydata->fatsize)) { 389 debug("curclust: 0x%x\n", curclust); 390 printf("Invalid FAT entry\n"); 391 return gotsize; 392 } 393 actsize = bytesperclust; 394 endclust = curclust; 395 } while (1); 396 } 397 398 #ifdef CONFIG_SUPPORT_VFAT 399 /* 400 * Extract the file name information from 'slotptr' into 'l_name', 401 * starting at l_name[*idx]. 402 * Return 1 if terminator (zero byte) is found, 0 otherwise. 403 */ 404 static int slot2str(dir_slot *slotptr, char *l_name, int *idx) 405 { 406 int j; 407 408 for (j = 0; j <= 8; j += 2) { 409 l_name[*idx] = slotptr->name0_4[j]; 410 if (l_name[*idx] == 0x00) 411 return 1; 412 (*idx)++; 413 } 414 for (j = 0; j <= 10; j += 2) { 415 l_name[*idx] = slotptr->name5_10[j]; 416 if (l_name[*idx] == 0x00) 417 return 1; 418 (*idx)++; 419 } 420 for (j = 0; j <= 2; j += 2) { 421 l_name[*idx] = slotptr->name11_12[j]; 422 if (l_name[*idx] == 0x00) 423 return 1; 424 (*idx)++; 425 } 426 427 return 0; 428 } 429 430 /* 431 * Extract the full long filename starting at 'retdent' (which is really 432 * a slot) into 'l_name'. If successful also copy the real directory entry 433 * into 'retdent' 434 * Return 0 on success, -1 otherwise. 435 */ 436 __u8 get_vfatname_block[MAX_CLUSTSIZE] 437 __aligned(ARCH_DMA_MINALIGN); 438 439 static int 440 get_vfatname(fsdata *mydata, int curclust, __u8 *cluster, 441 dir_entry *retdent, char *l_name) 442 { 443 dir_entry *realdent; 444 dir_slot *slotptr = (dir_slot *)retdent; 445 __u8 *buflimit = cluster + mydata->sect_size * ((curclust == 0) ? 446 PREFETCH_BLOCKS : 447 mydata->clust_size); 448 __u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff; 449 int idx = 0; 450 451 if (counter > VFAT_MAXSEQ) { 452 debug("Error: VFAT name is too long\n"); 453 return -1; 454 } 455 456 while ((__u8 *)slotptr < buflimit) { 457 if (counter == 0) 458 break; 459 if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter) 460 return -1; 461 slotptr++; 462 counter--; 463 } 464 465 if ((__u8 *)slotptr >= buflimit) { 466 dir_slot *slotptr2; 467 468 if (curclust == 0) 469 return -1; 470 curclust = get_fatent(mydata, curclust); 471 if (CHECK_CLUST(curclust, mydata->fatsize)) { 472 debug("curclust: 0x%x\n", curclust); 473 printf("Invalid FAT entry\n"); 474 return -1; 475 } 476 477 if (get_cluster(mydata, curclust, get_vfatname_block, 478 mydata->clust_size * mydata->sect_size) != 0) { 479 debug("Error: reading directory block\n"); 480 return -1; 481 } 482 483 slotptr2 = (dir_slot *)get_vfatname_block; 484 while (counter > 0) { 485 if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK) 486 & 0xff) != counter) 487 return -1; 488 slotptr2++; 489 counter--; 490 } 491 492 /* Save the real directory entry */ 493 realdent = (dir_entry *)slotptr2; 494 while ((__u8 *)slotptr2 > get_vfatname_block) { 495 slotptr2--; 496 slot2str(slotptr2, l_name, &idx); 497 } 498 } else { 499 /* Save the real directory entry */ 500 realdent = (dir_entry *)slotptr; 501 } 502 503 do { 504 slotptr--; 505 if (slot2str(slotptr, l_name, &idx)) 506 break; 507 } while (!(slotptr->id & LAST_LONG_ENTRY_MASK)); 508 509 l_name[idx] = '\0'; 510 if (*l_name == DELETED_FLAG) 511 *l_name = '\0'; 512 else if (*l_name == aRING) 513 *l_name = DELETED_FLAG; 514 downcase(l_name); 515 516 /* Return the real directory entry */ 517 memcpy(retdent, realdent, sizeof(dir_entry)); 518 519 return 0; 520 } 521 522 /* Calculate short name checksum */ 523 static __u8 mkcksum(const char *str) 524 { 525 int i; 526 527 __u8 ret = 0; 528 529 for (i = 0; i < 11; i++) { 530 ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + str[i]; 531 } 532 533 return ret; 534 } 535 #endif /* CONFIG_SUPPORT_VFAT */ 536 537 /* 538 * Get the directory entry associated with 'filename' from the directory 539 * starting at 'startsect' 540 */ 541 __u8 get_dentfromdir_block[MAX_CLUSTSIZE] 542 __aligned(ARCH_DMA_MINALIGN); 543 544 static dir_entry *get_dentfromdir(fsdata *mydata, int startsect, 545 char *filename, dir_entry *retdent, 546 int dols) 547 { 548 __u16 prevcksum = 0xffff; 549 __u32 curclust = START(retdent); 550 int files = 0, dirs = 0; 551 552 debug("get_dentfromdir: %s\n", filename); 553 554 while (1) { 555 dir_entry *dentptr; 556 557 int i; 558 559 if (get_cluster(mydata, curclust, get_dentfromdir_block, 560 mydata->clust_size * mydata->sect_size) != 0) { 561 debug("Error: reading directory block\n"); 562 return NULL; 563 } 564 565 dentptr = (dir_entry *)get_dentfromdir_block; 566 567 for (i = 0; i < DIRENTSPERCLUST; i++) { 568 char s_name[14], l_name[VFAT_MAXLEN_BYTES]; 569 570 l_name[0] = '\0'; 571 if (dentptr->name[0] == DELETED_FLAG) { 572 dentptr++; 573 continue; 574 } 575 if ((dentptr->attr & ATTR_VOLUME)) { 576 #ifdef CONFIG_SUPPORT_VFAT 577 if ((dentptr->attr & ATTR_VFAT) == ATTR_VFAT && 578 (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) { 579 prevcksum = ((dir_slot *)dentptr)->alias_checksum; 580 get_vfatname(mydata, curclust, 581 get_dentfromdir_block, 582 dentptr, l_name); 583 if (dols) { 584 int isdir; 585 char dirc; 586 int doit = 0; 587 588 isdir = (dentptr->attr & ATTR_DIR); 589 590 if (isdir) { 591 dirs++; 592 dirc = '/'; 593 doit = 1; 594 } else { 595 dirc = ' '; 596 if (l_name[0] != 0) { 597 files++; 598 doit = 1; 599 } 600 } 601 if (doit) { 602 if (dirc == ' ') { 603 printf(" %8ld %s%c\n", 604 (long)FAT2CPU32(dentptr->size), 605 l_name, 606 dirc); 607 } else { 608 printf(" %s%c\n", 609 l_name, 610 dirc); 611 } 612 } 613 dentptr++; 614 continue; 615 } 616 debug("vfatname: |%s|\n", l_name); 617 } else 618 #endif 619 { 620 /* Volume label or VFAT entry */ 621 dentptr++; 622 continue; 623 } 624 } 625 if (dentptr->name[0] == 0) { 626 if (dols) { 627 printf("\n%d file(s), %d dir(s)\n\n", 628 files, dirs); 629 } 630 debug("Dentname == NULL - %d\n", i); 631 return NULL; 632 } 633 #ifdef CONFIG_SUPPORT_VFAT 634 if (dols && mkcksum(dentptr->name) == prevcksum) { 635 prevcksum = 0xffff; 636 dentptr++; 637 continue; 638 } 639 #endif 640 get_name(dentptr, s_name); 641 if (dols) { 642 int isdir = (dentptr->attr & ATTR_DIR); 643 char dirc; 644 int doit = 0; 645 646 if (isdir) { 647 dirs++; 648 dirc = '/'; 649 doit = 1; 650 } else { 651 dirc = ' '; 652 if (s_name[0] != 0) { 653 files++; 654 doit = 1; 655 } 656 } 657 658 if (doit) { 659 if (dirc == ' ') { 660 printf(" %8ld %s%c\n", 661 (long)FAT2CPU32(dentptr->size), 662 s_name, dirc); 663 } else { 664 printf(" %s%c\n", 665 s_name, dirc); 666 } 667 } 668 669 dentptr++; 670 continue; 671 } 672 673 if (strcmp(filename, s_name) 674 && strcmp(filename, l_name)) { 675 debug("Mismatch: |%s|%s|\n", s_name, l_name); 676 dentptr++; 677 continue; 678 } 679 680 memcpy(retdent, dentptr, sizeof(dir_entry)); 681 682 debug("DentName: %s", s_name); 683 debug(", start: 0x%x", START(dentptr)); 684 debug(", size: 0x%x %s\n", 685 FAT2CPU32(dentptr->size), 686 (dentptr->attr & ATTR_DIR) ? "(DIR)" : ""); 687 688 return retdent; 689 } 690 691 curclust = get_fatent(mydata, curclust); 692 if (CHECK_CLUST(curclust, mydata->fatsize)) { 693 debug("curclust: 0x%x\n", curclust); 694 printf("Invalid FAT entry\n"); 695 return NULL; 696 } 697 } 698 699 return NULL; 700 } 701 702 /* 703 * Read boot sector and volume info from a FAT filesystem 704 */ 705 static int 706 read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize) 707 { 708 __u8 *block; 709 volume_info *vistart; 710 int ret = 0; 711 712 if (cur_dev == NULL) { 713 debug("Error: no device selected\n"); 714 return -1; 715 } 716 717 block = memalign(ARCH_DMA_MINALIGN, cur_dev->blksz); 718 if (block == NULL) { 719 debug("Error: allocating block\n"); 720 return -1; 721 } 722 723 if (disk_read(0, 1, block) < 0) { 724 debug("Error: reading block\n"); 725 goto fail; 726 } 727 728 memcpy(bs, block, sizeof(boot_sector)); 729 bs->reserved = FAT2CPU16(bs->reserved); 730 bs->fat_length = FAT2CPU16(bs->fat_length); 731 bs->secs_track = FAT2CPU16(bs->secs_track); 732 bs->heads = FAT2CPU16(bs->heads); 733 bs->total_sect = FAT2CPU32(bs->total_sect); 734 735 /* FAT32 entries */ 736 if (bs->fat_length == 0) { 737 /* Assume FAT32 */ 738 bs->fat32_length = FAT2CPU32(bs->fat32_length); 739 bs->flags = FAT2CPU16(bs->flags); 740 bs->root_cluster = FAT2CPU32(bs->root_cluster); 741 bs->info_sector = FAT2CPU16(bs->info_sector); 742 bs->backup_boot = FAT2CPU16(bs->backup_boot); 743 vistart = (volume_info *)(block + sizeof(boot_sector)); 744 *fatsize = 32; 745 } else { 746 vistart = (volume_info *)&(bs->fat32_length); 747 *fatsize = 0; 748 } 749 memcpy(volinfo, vistart, sizeof(volume_info)); 750 751 if (*fatsize == 32) { 752 if (strncmp(FAT32_SIGN, vistart->fs_type, SIGNLEN) == 0) 753 goto exit; 754 } else { 755 if (strncmp(FAT12_SIGN, vistart->fs_type, SIGNLEN) == 0) { 756 *fatsize = 12; 757 goto exit; 758 } 759 if (strncmp(FAT16_SIGN, vistart->fs_type, SIGNLEN) == 0) { 760 *fatsize = 16; 761 goto exit; 762 } 763 } 764 765 debug("Error: broken fs_type sign\n"); 766 fail: 767 ret = -1; 768 exit: 769 free(block); 770 return ret; 771 } 772 773 __u8 do_fat_read_block[MAX_CLUSTSIZE] 774 __aligned(ARCH_DMA_MINALIGN); 775 776 long 777 do_fat_read(const char *filename, void *buffer, unsigned long maxsize, int dols) 778 { 779 char fnamecopy[2048]; 780 boot_sector bs; 781 volume_info volinfo; 782 fsdata datablock; 783 fsdata *mydata = &datablock; 784 dir_entry *dentptr = NULL; 785 __u16 prevcksum = 0xffff; 786 char *subname = ""; 787 __u32 cursect; 788 int idx, isdir = 0; 789 int files = 0, dirs = 0; 790 long ret = -1; 791 int firsttime; 792 __u32 root_cluster = 0; 793 int rootdir_size = 0; 794 int j; 795 796 if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) { 797 debug("Error: reading boot sector\n"); 798 return -1; 799 } 800 801 if (mydata->fatsize == 32) { 802 root_cluster = bs.root_cluster; 803 mydata->fatlength = bs.fat32_length; 804 } else { 805 mydata->fatlength = bs.fat_length; 806 } 807 808 mydata->fat_sect = bs.reserved; 809 810 cursect = mydata->rootdir_sect 811 = mydata->fat_sect + mydata->fatlength * bs.fats; 812 813 mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0]; 814 mydata->clust_size = bs.cluster_size; 815 if (mydata->sect_size != cur_part_info.blksz) { 816 printf("Error: FAT sector size mismatch (fs=%hu, dev=%lu)\n", 817 mydata->sect_size, cur_part_info.blksz); 818 return -1; 819 } 820 821 if (mydata->fatsize == 32) { 822 mydata->data_begin = mydata->rootdir_sect - 823 (mydata->clust_size * 2); 824 } else { 825 rootdir_size = ((bs.dir_entries[1] * (int)256 + 826 bs.dir_entries[0]) * 827 sizeof(dir_entry)) / 828 mydata->sect_size; 829 mydata->data_begin = mydata->rootdir_sect + 830 rootdir_size - 831 (mydata->clust_size * 2); 832 } 833 834 mydata->fatbufnum = -1; 835 mydata->fatbuf = memalign(ARCH_DMA_MINALIGN, FATBUFSIZE); 836 if (mydata->fatbuf == NULL) { 837 debug("Error: allocating memory\n"); 838 return -1; 839 } 840 841 #ifdef CONFIG_SUPPORT_VFAT 842 debug("VFAT Support enabled\n"); 843 #endif 844 debug("FAT%d, fat_sect: %d, fatlength: %d\n", 845 mydata->fatsize, mydata->fat_sect, mydata->fatlength); 846 debug("Rootdir begins at cluster: %d, sector: %d, offset: %x\n" 847 "Data begins at: %d\n", 848 root_cluster, 849 mydata->rootdir_sect, 850 mydata->rootdir_sect * mydata->sect_size, mydata->data_begin); 851 debug("Sector size: %d, cluster size: %d\n", mydata->sect_size, 852 mydata->clust_size); 853 854 /* "cwd" is always the root... */ 855 while (ISDIRDELIM(*filename)) 856 filename++; 857 858 /* Make a copy of the filename and convert it to lowercase */ 859 strcpy(fnamecopy, filename); 860 downcase(fnamecopy); 861 862 if (*fnamecopy == '\0') { 863 if (!dols) 864 goto exit; 865 866 dols = LS_ROOT; 867 } else if ((idx = dirdelim(fnamecopy)) >= 0) { 868 isdir = 1; 869 fnamecopy[idx] = '\0'; 870 subname = fnamecopy + idx + 1; 871 872 /* Handle multiple delimiters */ 873 while (ISDIRDELIM(*subname)) 874 subname++; 875 } else if (dols) { 876 isdir = 1; 877 } 878 879 j = 0; 880 while (1) { 881 int i; 882 883 if (j == 0) { 884 debug("FAT read sect=%d, clust_size=%d, DIRENTSPERBLOCK=%zd\n", 885 cursect, mydata->clust_size, DIRENTSPERBLOCK); 886 887 if (disk_read(cursect, 888 (mydata->fatsize == 32) ? 889 (mydata->clust_size) : 890 PREFETCH_BLOCKS, 891 do_fat_read_block) < 0) { 892 debug("Error: reading rootdir block\n"); 893 goto exit; 894 } 895 896 dentptr = (dir_entry *) do_fat_read_block; 897 } 898 899 for (i = 0; i < DIRENTSPERBLOCK; i++) { 900 char s_name[14], l_name[VFAT_MAXLEN_BYTES]; 901 902 l_name[0] = '\0'; 903 if (dentptr->name[0] == DELETED_FLAG) { 904 dentptr++; 905 continue; 906 } 907 if ((dentptr->attr & ATTR_VOLUME)) { 908 #ifdef CONFIG_SUPPORT_VFAT 909 if ((dentptr->attr & ATTR_VFAT) == ATTR_VFAT && 910 (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) { 911 prevcksum = 912 ((dir_slot *)dentptr)->alias_checksum; 913 914 get_vfatname(mydata, 915 root_cluster, 916 do_fat_read_block, 917 dentptr, l_name); 918 919 if (dols == LS_ROOT) { 920 char dirc; 921 int doit = 0; 922 int isdir = 923 (dentptr->attr & ATTR_DIR); 924 925 if (isdir) { 926 dirs++; 927 dirc = '/'; 928 doit = 1; 929 } else { 930 dirc = ' '; 931 if (l_name[0] != 0) { 932 files++; 933 doit = 1; 934 } 935 } 936 if (doit) { 937 if (dirc == ' ') { 938 printf(" %8ld %s%c\n", 939 (long)FAT2CPU32(dentptr->size), 940 l_name, 941 dirc); 942 } else { 943 printf(" %s%c\n", 944 l_name, 945 dirc); 946 } 947 } 948 dentptr++; 949 continue; 950 } 951 debug("Rootvfatname: |%s|\n", 952 l_name); 953 } else 954 #endif 955 { 956 /* Volume label or VFAT entry */ 957 dentptr++; 958 continue; 959 } 960 } else if (dentptr->name[0] == 0) { 961 debug("RootDentname == NULL - %d\n", i); 962 if (dols == LS_ROOT) { 963 printf("\n%d file(s), %d dir(s)\n\n", 964 files, dirs); 965 ret = 0; 966 } 967 goto exit; 968 } 969 #ifdef CONFIG_SUPPORT_VFAT 970 else if (dols == LS_ROOT && 971 mkcksum(dentptr->name) == prevcksum) { 972 prevcksum = 0xffff; 973 dentptr++; 974 continue; 975 } 976 #endif 977 get_name(dentptr, s_name); 978 979 if (dols == LS_ROOT) { 980 int isdir = (dentptr->attr & ATTR_DIR); 981 char dirc; 982 int doit = 0; 983 984 if (isdir) { 985 dirc = '/'; 986 if (s_name[0] != 0) { 987 dirs++; 988 doit = 1; 989 } 990 } else { 991 dirc = ' '; 992 if (s_name[0] != 0) { 993 files++; 994 doit = 1; 995 } 996 } 997 if (doit) { 998 if (dirc == ' ') { 999 printf(" %8ld %s%c\n", 1000 (long)FAT2CPU32(dentptr->size), 1001 s_name, dirc); 1002 } else { 1003 printf(" %s%c\n", 1004 s_name, dirc); 1005 } 1006 } 1007 dentptr++; 1008 continue; 1009 } 1010 1011 if (strcmp(fnamecopy, s_name) 1012 && strcmp(fnamecopy, l_name)) { 1013 debug("RootMismatch: |%s|%s|\n", s_name, 1014 l_name); 1015 dentptr++; 1016 continue; 1017 } 1018 1019 if (isdir && !(dentptr->attr & ATTR_DIR)) 1020 goto exit; 1021 1022 debug("RootName: %s", s_name); 1023 debug(", start: 0x%x", START(dentptr)); 1024 debug(", size: 0x%x %s\n", 1025 FAT2CPU32(dentptr->size), 1026 isdir ? "(DIR)" : ""); 1027 1028 goto rootdir_done; /* We got a match */ 1029 } 1030 debug("END LOOP: j=%d clust_size=%d\n", j, 1031 mydata->clust_size); 1032 1033 /* 1034 * On FAT32 we must fetch the FAT entries for the next 1035 * root directory clusters when a cluster has been 1036 * completely processed. 1037 */ 1038 ++j; 1039 int rootdir_end = 0; 1040 if (mydata->fatsize == 32) { 1041 if (j == mydata->clust_size) { 1042 int nxtsect = 0; 1043 int nxt_clust = 0; 1044 1045 nxt_clust = get_fatent(mydata, root_cluster); 1046 rootdir_end = CHECK_CLUST(nxt_clust, 32); 1047 1048 nxtsect = mydata->data_begin + 1049 (nxt_clust * mydata->clust_size); 1050 1051 root_cluster = nxt_clust; 1052 1053 cursect = nxtsect; 1054 j = 0; 1055 } 1056 } else { 1057 if (j == PREFETCH_BLOCKS) 1058 j = 0; 1059 1060 rootdir_end = (++cursect - mydata->rootdir_sect >= 1061 rootdir_size); 1062 } 1063 1064 /* If end of rootdir reached */ 1065 if (rootdir_end) { 1066 if (dols == LS_ROOT) { 1067 printf("\n%d file(s), %d dir(s)\n\n", 1068 files, dirs); 1069 ret = 0; 1070 } 1071 goto exit; 1072 } 1073 } 1074 rootdir_done: 1075 1076 firsttime = 1; 1077 1078 while (isdir) { 1079 int startsect = mydata->data_begin 1080 + START(dentptr) * mydata->clust_size; 1081 dir_entry dent; 1082 char *nextname = NULL; 1083 1084 dent = *dentptr; 1085 dentptr = &dent; 1086 1087 idx = dirdelim(subname); 1088 1089 if (idx >= 0) { 1090 subname[idx] = '\0'; 1091 nextname = subname + idx + 1; 1092 /* Handle multiple delimiters */ 1093 while (ISDIRDELIM(*nextname)) 1094 nextname++; 1095 if (dols && *nextname == '\0') 1096 firsttime = 0; 1097 } else { 1098 if (dols && firsttime) { 1099 firsttime = 0; 1100 } else { 1101 isdir = 0; 1102 } 1103 } 1104 1105 if (get_dentfromdir(mydata, startsect, subname, dentptr, 1106 isdir ? 0 : dols) == NULL) { 1107 if (dols && !isdir) 1108 ret = 0; 1109 goto exit; 1110 } 1111 1112 if (isdir && !(dentptr->attr & ATTR_DIR)) 1113 goto exit; 1114 1115 if (idx >= 0) 1116 subname = nextname; 1117 } 1118 1119 ret = get_contents(mydata, dentptr, buffer, maxsize); 1120 debug("Size: %d, got: %ld\n", FAT2CPU32(dentptr->size), ret); 1121 1122 exit: 1123 free(mydata->fatbuf); 1124 return ret; 1125 } 1126 1127 int file_fat_detectfs(void) 1128 { 1129 boot_sector bs; 1130 volume_info volinfo; 1131 int fatsize; 1132 char vol_label[12]; 1133 1134 if (cur_dev == NULL) { 1135 printf("No current device\n"); 1136 return 1; 1137 } 1138 1139 #if defined(CONFIG_CMD_IDE) || \ 1140 defined(CONFIG_CMD_SATA) || \ 1141 defined(CONFIG_CMD_SCSI) || \ 1142 defined(CONFIG_CMD_USB) || \ 1143 defined(CONFIG_MMC) 1144 printf("Interface: "); 1145 switch (cur_dev->if_type) { 1146 case IF_TYPE_IDE: 1147 printf("IDE"); 1148 break; 1149 case IF_TYPE_SATA: 1150 printf("SATA"); 1151 break; 1152 case IF_TYPE_SCSI: 1153 printf("SCSI"); 1154 break; 1155 case IF_TYPE_ATAPI: 1156 printf("ATAPI"); 1157 break; 1158 case IF_TYPE_USB: 1159 printf("USB"); 1160 break; 1161 case IF_TYPE_DOC: 1162 printf("DOC"); 1163 break; 1164 case IF_TYPE_MMC: 1165 printf("MMC"); 1166 break; 1167 default: 1168 printf("Unknown"); 1169 } 1170 1171 printf("\n Device %d: ", cur_dev->dev); 1172 dev_print(cur_dev); 1173 #endif 1174 1175 if (read_bootsectandvi(&bs, &volinfo, &fatsize)) { 1176 printf("\nNo valid FAT fs found\n"); 1177 return 1; 1178 } 1179 1180 memcpy(vol_label, volinfo.volume_label, 11); 1181 vol_label[11] = '\0'; 1182 volinfo.fs_type[5] = '\0'; 1183 1184 printf("Partition %d: Filesystem: %s \"%s\"\n", cur_part_nr, 1185 volinfo.fs_type, vol_label); 1186 1187 return 0; 1188 } 1189 1190 int file_fat_ls(const char *dir) 1191 { 1192 return do_fat_read(dir, NULL, 0, LS_YES); 1193 } 1194 1195 long file_fat_read(const char *filename, void *buffer, unsigned long maxsize) 1196 { 1197 printf("reading %s\n", filename); 1198 return do_fat_read(filename, buffer, maxsize, LS_NO); 1199 } 1200