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 * SPDX-License-Identifier: GPL-2.0+ 10 */ 11 12 #include <common.h> 13 #include <blk.h> 14 #include <config.h> 15 #include <exports.h> 16 #include <fat.h> 17 #include <asm/byteorder.h> 18 #include <part.h> 19 #include <malloc.h> 20 #include <memalign.h> 21 #include <linux/compiler.h> 22 #include <linux/ctype.h> 23 24 #ifdef CONFIG_SUPPORT_VFAT 25 static const int vfat_enabled = 1; 26 #else 27 static const int vfat_enabled = 0; 28 #endif 29 30 /* 31 * Convert a string to lowercase. 32 */ 33 static void downcase(char *str) 34 { 35 while (*str != '\0') { 36 *str = tolower(*str); 37 str++; 38 } 39 } 40 41 static struct blk_desc *cur_dev; 42 static disk_partition_t cur_part_info; 43 44 #define DOS_BOOT_MAGIC_OFFSET 0x1fe 45 #define DOS_FS_TYPE_OFFSET 0x36 46 #define DOS_FS32_TYPE_OFFSET 0x52 47 48 static int disk_read(__u32 block, __u32 nr_blocks, void *buf) 49 { 50 ulong ret; 51 52 if (!cur_dev) 53 return -1; 54 55 ret = blk_dread(cur_dev, cur_part_info.start + block, nr_blocks, buf); 56 57 if (nr_blocks && ret == 0) 58 return -1; 59 60 return ret; 61 } 62 63 int fat_set_blk_dev(struct blk_desc *dev_desc, disk_partition_t *info) 64 { 65 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz); 66 67 cur_dev = dev_desc; 68 cur_part_info = *info; 69 70 /* Make sure it has a valid FAT header */ 71 if (disk_read(0, 1, buffer) != 1) { 72 cur_dev = NULL; 73 return -1; 74 } 75 76 /* Check if it's actually a DOS volume */ 77 if (memcmp(buffer + DOS_BOOT_MAGIC_OFFSET, "\x55\xAA", 2)) { 78 cur_dev = NULL; 79 return -1; 80 } 81 82 /* Check for FAT12/FAT16/FAT32 filesystem */ 83 if (!memcmp(buffer + DOS_FS_TYPE_OFFSET, "FAT", 3)) 84 return 0; 85 if (!memcmp(buffer + DOS_FS32_TYPE_OFFSET, "FAT32", 5)) 86 return 0; 87 88 cur_dev = NULL; 89 return -1; 90 } 91 92 int fat_register_device(struct blk_desc *dev_desc, int part_no) 93 { 94 disk_partition_t info; 95 96 /* First close any currently found FAT filesystem */ 97 cur_dev = NULL; 98 99 /* Read the partition table, if present */ 100 if (part_get_info(dev_desc, part_no, &info)) { 101 if (part_no != 0) { 102 printf("** Partition %d not valid on device %d **\n", 103 part_no, dev_desc->devnum); 104 return -1; 105 } 106 107 info.start = 0; 108 info.size = dev_desc->lba; 109 info.blksz = dev_desc->blksz; 110 info.name[0] = 0; 111 info.type[0] = 0; 112 info.bootable = 0; 113 #ifdef CONFIG_PARTITION_UUIDS 114 info.uuid[0] = 0; 115 #endif 116 } 117 118 return fat_set_blk_dev(dev_desc, &info); 119 } 120 121 /* 122 * Get the first occurence of a directory delimiter ('/' or '\') in a string. 123 * Return index into string if found, -1 otherwise. 124 */ 125 static int dirdelim(char *str) 126 { 127 char *start = str; 128 129 while (*str != '\0') { 130 if (ISDIRDELIM(*str)) 131 return str - start; 132 str++; 133 } 134 return -1; 135 } 136 137 /* 138 * Extract zero terminated short name from a directory entry. 139 */ 140 static void get_name(dir_entry *dirent, char *s_name) 141 { 142 char *ptr; 143 144 memcpy(s_name, dirent->name, 8); 145 s_name[8] = '\0'; 146 ptr = s_name; 147 while (*ptr && *ptr != ' ') 148 ptr++; 149 if (dirent->ext[0] && dirent->ext[0] != ' ') { 150 *ptr = '.'; 151 ptr++; 152 memcpy(ptr, dirent->ext, 3); 153 ptr[3] = '\0'; 154 while (*ptr && *ptr != ' ') 155 ptr++; 156 } 157 *ptr = '\0'; 158 if (*s_name == DELETED_FLAG) 159 *s_name = '\0'; 160 else if (*s_name == aRING) 161 *s_name = DELETED_FLAG; 162 downcase(s_name); 163 } 164 165 static int flush_dirty_fat_buffer(fsdata *mydata); 166 #if !defined(CONFIG_FAT_WRITE) 167 /* Stub for read only operation */ 168 int flush_dirty_fat_buffer(fsdata *mydata) 169 { 170 (void)(mydata); 171 return 0; 172 } 173 #endif 174 175 /* 176 * Get the entry at index 'entry' in a FAT (12/16/32) table. 177 * On failure 0x00 is returned. 178 */ 179 static __u32 get_fatent(fsdata *mydata, __u32 entry) 180 { 181 __u32 bufnum; 182 __u32 off16, offset; 183 __u32 ret = 0x00; 184 185 if (CHECK_CLUST(entry, mydata->fatsize)) { 186 printf("Error: Invalid FAT entry: 0x%08x\n", entry); 187 return ret; 188 } 189 190 switch (mydata->fatsize) { 191 case 32: 192 bufnum = entry / FAT32BUFSIZE; 193 offset = entry - bufnum * FAT32BUFSIZE; 194 break; 195 case 16: 196 bufnum = entry / FAT16BUFSIZE; 197 offset = entry - bufnum * FAT16BUFSIZE; 198 break; 199 case 12: 200 bufnum = entry / FAT12BUFSIZE; 201 offset = entry - bufnum * FAT12BUFSIZE; 202 break; 203 204 default: 205 /* Unsupported FAT size */ 206 return ret; 207 } 208 209 debug("FAT%d: entry: 0x%08x = %d, offset: 0x%04x = %d\n", 210 mydata->fatsize, entry, entry, offset, offset); 211 212 /* Read a new block of FAT entries into the cache. */ 213 if (bufnum != mydata->fatbufnum) { 214 __u32 getsize = FATBUFBLOCKS; 215 __u8 *bufptr = mydata->fatbuf; 216 __u32 fatlength = mydata->fatlength; 217 __u32 startblock = bufnum * FATBUFBLOCKS; 218 219 /* Cap length if fatlength is not a multiple of FATBUFBLOCKS */ 220 if (startblock + getsize > fatlength) 221 getsize = fatlength - startblock; 222 223 startblock += mydata->fat_sect; /* Offset from start of disk */ 224 225 /* Write back the fatbuf to the disk */ 226 if (flush_dirty_fat_buffer(mydata) < 0) 227 return -1; 228 229 if (disk_read(startblock, getsize, bufptr) < 0) { 230 debug("Error reading FAT blocks\n"); 231 return ret; 232 } 233 mydata->fatbufnum = bufnum; 234 } 235 236 /* Get the actual entry from the table */ 237 switch (mydata->fatsize) { 238 case 32: 239 ret = FAT2CPU32(((__u32 *) mydata->fatbuf)[offset]); 240 break; 241 case 16: 242 ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[offset]); 243 break; 244 case 12: 245 off16 = (offset * 3) / 2; 246 ret = FAT2CPU16(*(__u16 *)(mydata->fatbuf + off16)); 247 248 if (offset & 0x1) 249 ret >>= 4; 250 ret &= 0xfff; 251 } 252 debug("FAT%d: ret: 0x%08x, entry: 0x%08x, offset: 0x%04x\n", 253 mydata->fatsize, ret, entry, offset); 254 255 return ret; 256 } 257 258 /* 259 * Read at most 'size' bytes from the specified cluster into 'buffer'. 260 * Return 0 on success, -1 otherwise. 261 */ 262 static int 263 get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size) 264 { 265 __u32 idx = 0; 266 __u32 startsect; 267 int ret; 268 269 if (clustnum > 0) { 270 startsect = mydata->data_begin + 271 clustnum * mydata->clust_size; 272 } else { 273 startsect = mydata->rootdir_sect; 274 } 275 276 debug("gc - clustnum: %d, startsect: %d\n", clustnum, startsect); 277 278 if ((unsigned long)buffer & (ARCH_DMA_MINALIGN - 1)) { 279 ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size); 280 281 printf("FAT: Misaligned buffer address (%p)\n", buffer); 282 283 while (size >= mydata->sect_size) { 284 ret = disk_read(startsect++, 1, tmpbuf); 285 if (ret != 1) { 286 debug("Error reading data (got %d)\n", ret); 287 return -1; 288 } 289 290 memcpy(buffer, tmpbuf, mydata->sect_size); 291 buffer += mydata->sect_size; 292 size -= mydata->sect_size; 293 } 294 } else { 295 idx = size / mydata->sect_size; 296 ret = disk_read(startsect, idx, buffer); 297 if (ret != idx) { 298 debug("Error reading data (got %d)\n", ret); 299 return -1; 300 } 301 startsect += idx; 302 idx *= mydata->sect_size; 303 buffer += idx; 304 size -= idx; 305 } 306 if (size) { 307 ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size); 308 309 ret = disk_read(startsect, 1, tmpbuf); 310 if (ret != 1) { 311 debug("Error reading data (got %d)\n", ret); 312 return -1; 313 } 314 315 memcpy(buffer, tmpbuf, size); 316 } 317 318 return 0; 319 } 320 321 /* 322 * Read at most 'maxsize' bytes from 'pos' in the file associated with 'dentptr' 323 * into 'buffer'. 324 * Update the number of bytes read in *gotsize or return -1 on fatal errors. 325 */ 326 __u8 get_contents_vfatname_block[MAX_CLUSTSIZE] 327 __aligned(ARCH_DMA_MINALIGN); 328 329 static int get_contents(fsdata *mydata, dir_entry *dentptr, loff_t pos, 330 __u8 *buffer, loff_t maxsize, loff_t *gotsize) 331 { 332 loff_t filesize = FAT2CPU32(dentptr->size); 333 unsigned int bytesperclust = mydata->clust_size * mydata->sect_size; 334 __u32 curclust = START(dentptr); 335 __u32 endclust, newclust; 336 loff_t actsize; 337 338 *gotsize = 0; 339 debug("Filesize: %llu bytes\n", filesize); 340 341 if (pos >= filesize) { 342 debug("Read position past EOF: %llu\n", pos); 343 return 0; 344 } 345 346 if (maxsize > 0 && filesize > pos + maxsize) 347 filesize = pos + maxsize; 348 349 debug("%llu bytes\n", filesize); 350 351 actsize = bytesperclust; 352 353 /* go to cluster at pos */ 354 while (actsize <= pos) { 355 curclust = get_fatent(mydata, curclust); 356 if (CHECK_CLUST(curclust, mydata->fatsize)) { 357 debug("curclust: 0x%x\n", curclust); 358 debug("Invalid FAT entry\n"); 359 return 0; 360 } 361 actsize += bytesperclust; 362 } 363 364 /* actsize > pos */ 365 actsize -= bytesperclust; 366 filesize -= actsize; 367 pos -= actsize; 368 369 /* align to beginning of next cluster if any */ 370 if (pos) { 371 actsize = min(filesize, (loff_t)bytesperclust); 372 if (get_cluster(mydata, curclust, get_contents_vfatname_block, 373 (int)actsize) != 0) { 374 printf("Error reading cluster\n"); 375 return -1; 376 } 377 filesize -= actsize; 378 actsize -= pos; 379 memcpy(buffer, get_contents_vfatname_block + pos, actsize); 380 *gotsize += actsize; 381 if (!filesize) 382 return 0; 383 buffer += actsize; 384 385 curclust = get_fatent(mydata, curclust); 386 if (CHECK_CLUST(curclust, mydata->fatsize)) { 387 debug("curclust: 0x%x\n", curclust); 388 debug("Invalid FAT entry\n"); 389 return 0; 390 } 391 } 392 393 actsize = bytesperclust; 394 endclust = curclust; 395 396 do { 397 /* search for consecutive clusters */ 398 while (actsize < filesize) { 399 newclust = get_fatent(mydata, endclust); 400 if ((newclust - 1) != endclust) 401 goto getit; 402 if (CHECK_CLUST(newclust, mydata->fatsize)) { 403 debug("curclust: 0x%x\n", newclust); 404 debug("Invalid FAT entry\n"); 405 return 0; 406 } 407 endclust = newclust; 408 actsize += bytesperclust; 409 } 410 411 /* get remaining bytes */ 412 actsize = filesize; 413 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 414 printf("Error reading cluster\n"); 415 return -1; 416 } 417 *gotsize += actsize; 418 return 0; 419 getit: 420 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 421 printf("Error reading cluster\n"); 422 return -1; 423 } 424 *gotsize += (int)actsize; 425 filesize -= actsize; 426 buffer += actsize; 427 428 curclust = get_fatent(mydata, endclust); 429 if (CHECK_CLUST(curclust, mydata->fatsize)) { 430 debug("curclust: 0x%x\n", curclust); 431 printf("Invalid FAT entry\n"); 432 return 0; 433 } 434 actsize = bytesperclust; 435 endclust = curclust; 436 } while (1); 437 } 438 439 /* 440 * Extract the file name information from 'slotptr' into 'l_name', 441 * starting at l_name[*idx]. 442 * Return 1 if terminator (zero byte) is found, 0 otherwise. 443 */ 444 static int slot2str(dir_slot *slotptr, char *l_name, int *idx) 445 { 446 int j; 447 448 for (j = 0; j <= 8; j += 2) { 449 l_name[*idx] = slotptr->name0_4[j]; 450 if (l_name[*idx] == 0x00) 451 return 1; 452 (*idx)++; 453 } 454 for (j = 0; j <= 10; j += 2) { 455 l_name[*idx] = slotptr->name5_10[j]; 456 if (l_name[*idx] == 0x00) 457 return 1; 458 (*idx)++; 459 } 460 for (j = 0; j <= 2; j += 2) { 461 l_name[*idx] = slotptr->name11_12[j]; 462 if (l_name[*idx] == 0x00) 463 return 1; 464 (*idx)++; 465 } 466 467 return 0; 468 } 469 470 /* 471 * Extract the full long filename starting at 'retdent' (which is really 472 * a slot) into 'l_name'. If successful also copy the real directory entry 473 * into 'retdent' 474 * Return 0 on success, -1 otherwise. 475 */ 476 static int 477 get_vfatname(fsdata *mydata, int curclust, __u8 *cluster, 478 dir_entry *retdent, char *l_name) 479 { 480 dir_entry *realdent; 481 dir_slot *slotptr = (dir_slot *)retdent; 482 __u8 *buflimit = cluster + mydata->sect_size * ((curclust == 0) ? 483 PREFETCH_BLOCKS : 484 mydata->clust_size); 485 __u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff; 486 int idx = 0; 487 488 if (counter > VFAT_MAXSEQ) { 489 debug("Error: VFAT name is too long\n"); 490 return -1; 491 } 492 493 while ((__u8 *)slotptr < buflimit) { 494 if (counter == 0) 495 break; 496 if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter) 497 return -1; 498 slotptr++; 499 counter--; 500 } 501 502 if ((__u8 *)slotptr >= buflimit) { 503 dir_slot *slotptr2; 504 505 if (curclust == 0) 506 return -1; 507 curclust = get_fatent(mydata, curclust); 508 if (CHECK_CLUST(curclust, mydata->fatsize)) { 509 debug("curclust: 0x%x\n", curclust); 510 printf("Invalid FAT entry\n"); 511 return -1; 512 } 513 514 if (get_cluster(mydata, curclust, get_contents_vfatname_block, 515 mydata->clust_size * mydata->sect_size) != 0) { 516 debug("Error: reading directory block\n"); 517 return -1; 518 } 519 520 slotptr2 = (dir_slot *)get_contents_vfatname_block; 521 while (counter > 0) { 522 if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK) 523 & 0xff) != counter) 524 return -1; 525 slotptr2++; 526 counter--; 527 } 528 529 /* Save the real directory entry */ 530 realdent = (dir_entry *)slotptr2; 531 while ((__u8 *)slotptr2 > get_contents_vfatname_block) { 532 slotptr2--; 533 slot2str(slotptr2, l_name, &idx); 534 } 535 } else { 536 /* Save the real directory entry */ 537 realdent = (dir_entry *)slotptr; 538 } 539 540 do { 541 slotptr--; 542 if (slot2str(slotptr, l_name, &idx)) 543 break; 544 } while (!(slotptr->id & LAST_LONG_ENTRY_MASK)); 545 546 l_name[idx] = '\0'; 547 if (*l_name == DELETED_FLAG) 548 *l_name = '\0'; 549 else if (*l_name == aRING) 550 *l_name = DELETED_FLAG; 551 downcase(l_name); 552 553 /* Return the real directory entry */ 554 memcpy(retdent, realdent, sizeof(dir_entry)); 555 556 return 0; 557 } 558 559 /* Calculate short name checksum */ 560 static __u8 mkcksum(const char name[8], const char ext[3]) 561 { 562 int i; 563 564 __u8 ret = 0; 565 566 for (i = 0; i < 8; i++) 567 ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + name[i]; 568 for (i = 0; i < 3; i++) 569 ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + ext[i]; 570 571 return ret; 572 } 573 574 /* 575 * Get the directory entry associated with 'filename' from the directory 576 * starting at 'startsect' 577 */ 578 __u8 get_dentfromdir_block[MAX_CLUSTSIZE] 579 __aligned(ARCH_DMA_MINALIGN); 580 581 static dir_entry *get_dentfromdir(fsdata *mydata, int startsect, 582 char *filename, dir_entry *retdent, 583 int dols) 584 { 585 __u16 prevcksum = 0xffff; 586 __u32 curclust = START(retdent); 587 int files = 0, dirs = 0; 588 589 debug("get_dentfromdir: %s\n", filename); 590 591 while (1) { 592 dir_entry *dentptr; 593 594 int i; 595 596 if (get_cluster(mydata, curclust, get_dentfromdir_block, 597 mydata->clust_size * mydata->sect_size) != 0) { 598 debug("Error: reading directory block\n"); 599 return NULL; 600 } 601 602 dentptr = (dir_entry *)get_dentfromdir_block; 603 604 for (i = 0; i < DIRENTSPERCLUST; i++) { 605 char s_name[14], l_name[VFAT_MAXLEN_BYTES]; 606 607 l_name[0] = '\0'; 608 if (dentptr->name[0] == DELETED_FLAG) { 609 dentptr++; 610 continue; 611 } 612 if ((dentptr->attr & ATTR_VOLUME)) { 613 if (vfat_enabled && 614 (dentptr->attr & ATTR_VFAT) == ATTR_VFAT && 615 (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) { 616 prevcksum = ((dir_slot *)dentptr)->alias_checksum; 617 get_vfatname(mydata, curclust, 618 get_dentfromdir_block, 619 dentptr, l_name); 620 if (dols) { 621 int isdir; 622 char dirc; 623 int doit = 0; 624 625 isdir = (dentptr->attr & ATTR_DIR); 626 627 if (isdir) { 628 dirs++; 629 dirc = '/'; 630 doit = 1; 631 } else { 632 dirc = ' '; 633 if (l_name[0] != 0) { 634 files++; 635 doit = 1; 636 } 637 } 638 if (doit) { 639 if (dirc == ' ') { 640 printf(" %8u %s%c\n", 641 FAT2CPU32(dentptr->size), 642 l_name, 643 dirc); 644 } else { 645 printf(" %s%c\n", 646 l_name, 647 dirc); 648 } 649 } 650 dentptr++; 651 continue; 652 } 653 debug("vfatname: |%s|\n", l_name); 654 } else { 655 /* Volume label or VFAT entry */ 656 dentptr++; 657 continue; 658 } 659 } 660 if (dentptr->name[0] == 0) { 661 if (dols) { 662 printf("\n%d file(s), %d dir(s)\n\n", 663 files, dirs); 664 } 665 debug("Dentname == NULL - %d\n", i); 666 return NULL; 667 } 668 if (vfat_enabled) { 669 __u8 csum = mkcksum(dentptr->name, dentptr->ext); 670 if (dols && csum == prevcksum) { 671 prevcksum = 0xffff; 672 dentptr++; 673 continue; 674 } 675 } 676 677 get_name(dentptr, s_name); 678 if (dols) { 679 int isdir = (dentptr->attr & ATTR_DIR); 680 char dirc; 681 int doit = 0; 682 683 if (isdir) { 684 dirs++; 685 dirc = '/'; 686 doit = 1; 687 } else { 688 dirc = ' '; 689 if (s_name[0] != 0) { 690 files++; 691 doit = 1; 692 } 693 } 694 695 if (doit) { 696 if (dirc == ' ') { 697 printf(" %8u %s%c\n", 698 FAT2CPU32(dentptr->size), 699 s_name, dirc); 700 } else { 701 printf(" %s%c\n", 702 s_name, dirc); 703 } 704 } 705 706 dentptr++; 707 continue; 708 } 709 710 if (strcmp(filename, s_name) 711 && strcmp(filename, l_name)) { 712 debug("Mismatch: |%s|%s|\n", s_name, l_name); 713 dentptr++; 714 continue; 715 } 716 717 memcpy(retdent, dentptr, sizeof(dir_entry)); 718 719 debug("DentName: %s", s_name); 720 debug(", start: 0x%x", START(dentptr)); 721 debug(", size: 0x%x %s\n", 722 FAT2CPU32(dentptr->size), 723 (dentptr->attr & ATTR_DIR) ? "(DIR)" : ""); 724 725 return retdent; 726 } 727 728 curclust = get_fatent(mydata, curclust); 729 if (CHECK_CLUST(curclust, mydata->fatsize)) { 730 debug("curclust: 0x%x\n", curclust); 731 printf("Invalid FAT entry\n"); 732 return NULL; 733 } 734 } 735 736 return NULL; 737 } 738 739 /* 740 * Read boot sector and volume info from a FAT filesystem 741 */ 742 static int 743 read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize) 744 { 745 __u8 *block; 746 volume_info *vistart; 747 int ret = 0; 748 749 if (cur_dev == NULL) { 750 debug("Error: no device selected\n"); 751 return -1; 752 } 753 754 block = memalign(ARCH_DMA_MINALIGN, cur_dev->blksz); 755 if (block == NULL) { 756 debug("Error: allocating block\n"); 757 return -1; 758 } 759 760 if (disk_read(0, 1, block) < 0) { 761 debug("Error: reading block\n"); 762 goto fail; 763 } 764 765 memcpy(bs, block, sizeof(boot_sector)); 766 bs->reserved = FAT2CPU16(bs->reserved); 767 bs->fat_length = FAT2CPU16(bs->fat_length); 768 bs->secs_track = FAT2CPU16(bs->secs_track); 769 bs->heads = FAT2CPU16(bs->heads); 770 bs->total_sect = FAT2CPU32(bs->total_sect); 771 772 /* FAT32 entries */ 773 if (bs->fat_length == 0) { 774 /* Assume FAT32 */ 775 bs->fat32_length = FAT2CPU32(bs->fat32_length); 776 bs->flags = FAT2CPU16(bs->flags); 777 bs->root_cluster = FAT2CPU32(bs->root_cluster); 778 bs->info_sector = FAT2CPU16(bs->info_sector); 779 bs->backup_boot = FAT2CPU16(bs->backup_boot); 780 vistart = (volume_info *)(block + sizeof(boot_sector)); 781 *fatsize = 32; 782 } else { 783 vistart = (volume_info *)&(bs->fat32_length); 784 *fatsize = 0; 785 } 786 memcpy(volinfo, vistart, sizeof(volume_info)); 787 788 if (*fatsize == 32) { 789 if (strncmp(FAT32_SIGN, vistart->fs_type, SIGNLEN) == 0) 790 goto exit; 791 } else { 792 if (strncmp(FAT12_SIGN, vistart->fs_type, SIGNLEN) == 0) { 793 *fatsize = 12; 794 goto exit; 795 } 796 if (strncmp(FAT16_SIGN, vistart->fs_type, SIGNLEN) == 0) { 797 *fatsize = 16; 798 goto exit; 799 } 800 } 801 802 debug("Error: broken fs_type sign\n"); 803 fail: 804 ret = -1; 805 exit: 806 free(block); 807 return ret; 808 } 809 810 __u8 do_fat_read_at_block[MAX_CLUSTSIZE] 811 __aligned(ARCH_DMA_MINALIGN); 812 813 int do_fat_read_at(const char *filename, loff_t pos, void *buffer, 814 loff_t maxsize, int dols, int dogetsize, loff_t *size) 815 { 816 char fnamecopy[2048]; 817 boot_sector bs; 818 volume_info volinfo; 819 fsdata datablock; 820 fsdata *mydata = &datablock; 821 dir_entry *dentptr = NULL; 822 __u16 prevcksum = 0xffff; 823 char *subname = ""; 824 __u32 cursect; 825 int idx, isdir = 0; 826 int files = 0, dirs = 0; 827 int ret = -1; 828 int firsttime; 829 __u32 root_cluster = 0; 830 __u32 read_blk; 831 int rootdir_size = 0; 832 int buffer_blk_cnt; 833 int do_read; 834 __u8 *dir_ptr; 835 836 if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) { 837 debug("Error: reading boot sector\n"); 838 return -1; 839 } 840 841 if (mydata->fatsize == 32) { 842 root_cluster = bs.root_cluster; 843 mydata->fatlength = bs.fat32_length; 844 } else { 845 mydata->fatlength = bs.fat_length; 846 } 847 848 mydata->fat_sect = bs.reserved; 849 850 cursect = mydata->rootdir_sect 851 = mydata->fat_sect + mydata->fatlength * bs.fats; 852 853 mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0]; 854 mydata->clust_size = bs.cluster_size; 855 if (mydata->sect_size != cur_part_info.blksz) { 856 printf("Error: FAT sector size mismatch (fs=%hu, dev=%lu)\n", 857 mydata->sect_size, cur_part_info.blksz); 858 return -1; 859 } 860 861 if (mydata->fatsize == 32) { 862 mydata->data_begin = mydata->rootdir_sect - 863 (mydata->clust_size * 2); 864 } else { 865 rootdir_size = ((bs.dir_entries[1] * (int)256 + 866 bs.dir_entries[0]) * 867 sizeof(dir_entry)) / 868 mydata->sect_size; 869 mydata->data_begin = mydata->rootdir_sect + 870 rootdir_size - 871 (mydata->clust_size * 2); 872 } 873 874 mydata->fatbufnum = -1; 875 mydata->fat_dirty = 0; 876 mydata->fatbuf = memalign(ARCH_DMA_MINALIGN, FATBUFSIZE); 877 if (mydata->fatbuf == NULL) { 878 debug("Error: allocating memory\n"); 879 return -1; 880 } 881 882 if (vfat_enabled) 883 debug("VFAT Support enabled\n"); 884 885 debug("FAT%d, fat_sect: %d, fatlength: %d\n", 886 mydata->fatsize, mydata->fat_sect, mydata->fatlength); 887 debug("Rootdir begins at cluster: %d, sector: %d, offset: %x\n" 888 "Data begins at: %d\n", 889 root_cluster, 890 mydata->rootdir_sect, 891 mydata->rootdir_sect * mydata->sect_size, mydata->data_begin); 892 debug("Sector size: %d, cluster size: %d\n", mydata->sect_size, 893 mydata->clust_size); 894 895 /* "cwd" is always the root... */ 896 while (ISDIRDELIM(*filename)) 897 filename++; 898 899 /* Make a copy of the filename and convert it to lowercase */ 900 strcpy(fnamecopy, filename); 901 downcase(fnamecopy); 902 903 root_reparse: 904 if (*fnamecopy == '\0') { 905 if (!dols) 906 goto exit; 907 908 dols = LS_ROOT; 909 } else if ((idx = dirdelim(fnamecopy)) >= 0) { 910 isdir = 1; 911 fnamecopy[idx] = '\0'; 912 subname = fnamecopy + idx + 1; 913 914 /* Handle multiple delimiters */ 915 while (ISDIRDELIM(*subname)) 916 subname++; 917 } else if (dols) { 918 isdir = 1; 919 } 920 921 buffer_blk_cnt = 0; 922 firsttime = 1; 923 while (1) { 924 int i; 925 926 if (mydata->fatsize == 32 || firsttime) { 927 dir_ptr = do_fat_read_at_block; 928 firsttime = 0; 929 } else { 930 /** 931 * FAT16 sector buffer modification: 932 * Each loop, the second buffered block is moved to 933 * the buffer begin, and two next sectors are read 934 * next to the previously moved one. So the sector 935 * buffer keeps always 3 sectors for fat16. 936 * And the current sector is the buffer second sector 937 * beside the "firsttime" read, when it is the first one. 938 * 939 * PREFETCH_BLOCKS is 2 for FAT16 == loop[0:1] 940 * n = computed root dir sector 941 * loop | cursect-1 | cursect | cursect+1 | 942 * 0 | sector n+0 | sector n+1 | none | 943 * 1 | none | sector n+0 | sector n+1 | 944 * 0 | sector n+1 | sector n+2 | sector n+3 | 945 * 1 | sector n+3 | ... 946 */ 947 dir_ptr = (do_fat_read_at_block + mydata->sect_size); 948 memcpy(do_fat_read_at_block, dir_ptr, mydata->sect_size); 949 } 950 951 do_read = 1; 952 953 if (mydata->fatsize == 32 && buffer_blk_cnt) 954 do_read = 0; 955 956 if (do_read) { 957 read_blk = (mydata->fatsize == 32) ? 958 mydata->clust_size : PREFETCH_BLOCKS; 959 960 debug("FAT read(sect=%d, cnt:%d), clust_size=%d, DIRENTSPERBLOCK=%zd\n", 961 cursect, read_blk, mydata->clust_size, DIRENTSPERBLOCK); 962 963 if (disk_read(cursect, read_blk, dir_ptr) < 0) { 964 debug("Error: reading rootdir block\n"); 965 goto exit; 966 } 967 968 dentptr = (dir_entry *)dir_ptr; 969 } 970 971 for (i = 0; i < DIRENTSPERBLOCK; i++) { 972 char s_name[14], l_name[VFAT_MAXLEN_BYTES]; 973 __u8 csum; 974 975 l_name[0] = '\0'; 976 if (dentptr->name[0] == DELETED_FLAG) { 977 dentptr++; 978 continue; 979 } 980 981 if (vfat_enabled) 982 csum = mkcksum(dentptr->name, dentptr->ext); 983 984 if (dentptr->attr & ATTR_VOLUME) { 985 if (vfat_enabled && 986 (dentptr->attr & ATTR_VFAT) == ATTR_VFAT && 987 (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) { 988 prevcksum = 989 ((dir_slot *)dentptr)->alias_checksum; 990 991 get_vfatname(mydata, 992 root_cluster, 993 dir_ptr, 994 dentptr, l_name); 995 996 if (dols == LS_ROOT) { 997 char dirc; 998 int doit = 0; 999 int isdir = 1000 (dentptr->attr & ATTR_DIR); 1001 1002 if (isdir) { 1003 dirs++; 1004 dirc = '/'; 1005 doit = 1; 1006 } else { 1007 dirc = ' '; 1008 if (l_name[0] != 0) { 1009 files++; 1010 doit = 1; 1011 } 1012 } 1013 if (doit) { 1014 if (dirc == ' ') { 1015 printf(" %8u %s%c\n", 1016 FAT2CPU32(dentptr->size), 1017 l_name, 1018 dirc); 1019 } else { 1020 printf(" %s%c\n", 1021 l_name, 1022 dirc); 1023 } 1024 } 1025 dentptr++; 1026 continue; 1027 } 1028 debug("Rootvfatname: |%s|\n", 1029 l_name); 1030 } else { 1031 /* Volume label or VFAT entry */ 1032 dentptr++; 1033 continue; 1034 } 1035 } else if (dentptr->name[0] == 0) { 1036 debug("RootDentname == NULL - %d\n", i); 1037 if (dols == LS_ROOT) { 1038 printf("\n%d file(s), %d dir(s)\n\n", 1039 files, dirs); 1040 ret = 0; 1041 } 1042 goto exit; 1043 } 1044 else if (vfat_enabled && 1045 dols == LS_ROOT && csum == prevcksum) { 1046 prevcksum = 0xffff; 1047 dentptr++; 1048 continue; 1049 } 1050 1051 get_name(dentptr, s_name); 1052 1053 if (dols == LS_ROOT) { 1054 int isdir = (dentptr->attr & ATTR_DIR); 1055 char dirc; 1056 int doit = 0; 1057 1058 if (isdir) { 1059 dirc = '/'; 1060 if (s_name[0] != 0) { 1061 dirs++; 1062 doit = 1; 1063 } 1064 } else { 1065 dirc = ' '; 1066 if (s_name[0] != 0) { 1067 files++; 1068 doit = 1; 1069 } 1070 } 1071 if (doit) { 1072 if (dirc == ' ') { 1073 printf(" %8u %s%c\n", 1074 FAT2CPU32(dentptr->size), 1075 s_name, dirc); 1076 } else { 1077 printf(" %s%c\n", 1078 s_name, dirc); 1079 } 1080 } 1081 dentptr++; 1082 continue; 1083 } 1084 1085 if (strcmp(fnamecopy, s_name) 1086 && strcmp(fnamecopy, l_name)) { 1087 debug("RootMismatch: |%s|%s|\n", s_name, 1088 l_name); 1089 dentptr++; 1090 continue; 1091 } 1092 1093 if (isdir && !(dentptr->attr & ATTR_DIR)) 1094 goto exit; 1095 1096 debug("RootName: %s", s_name); 1097 debug(", start: 0x%x", START(dentptr)); 1098 debug(", size: 0x%x %s\n", 1099 FAT2CPU32(dentptr->size), 1100 isdir ? "(DIR)" : ""); 1101 1102 goto rootdir_done; /* We got a match */ 1103 } 1104 debug("END LOOP: buffer_blk_cnt=%d clust_size=%d\n", buffer_blk_cnt, 1105 mydata->clust_size); 1106 1107 /* 1108 * On FAT32 we must fetch the FAT entries for the next 1109 * root directory clusters when a cluster has been 1110 * completely processed. 1111 */ 1112 ++buffer_blk_cnt; 1113 int rootdir_end = 0; 1114 if (mydata->fatsize == 32) { 1115 if (buffer_blk_cnt == mydata->clust_size) { 1116 int nxtsect = 0; 1117 int nxt_clust = 0; 1118 1119 nxt_clust = get_fatent(mydata, root_cluster); 1120 rootdir_end = CHECK_CLUST(nxt_clust, 32); 1121 1122 nxtsect = mydata->data_begin + 1123 (nxt_clust * mydata->clust_size); 1124 1125 root_cluster = nxt_clust; 1126 1127 cursect = nxtsect; 1128 buffer_blk_cnt = 0; 1129 } 1130 } else { 1131 if (buffer_blk_cnt == PREFETCH_BLOCKS) 1132 buffer_blk_cnt = 0; 1133 1134 rootdir_end = (++cursect - mydata->rootdir_sect >= 1135 rootdir_size); 1136 } 1137 1138 /* If end of rootdir reached */ 1139 if (rootdir_end) { 1140 if (dols == LS_ROOT) { 1141 printf("\n%d file(s), %d dir(s)\n\n", 1142 files, dirs); 1143 *size = 0; 1144 } 1145 goto exit; 1146 } 1147 } 1148 rootdir_done: 1149 1150 firsttime = 1; 1151 1152 while (isdir) { 1153 int startsect = mydata->data_begin 1154 + START(dentptr) * mydata->clust_size; 1155 dir_entry dent; 1156 char *nextname = NULL; 1157 1158 dent = *dentptr; 1159 dentptr = &dent; 1160 1161 idx = dirdelim(subname); 1162 1163 if (idx >= 0) { 1164 subname[idx] = '\0'; 1165 nextname = subname + idx + 1; 1166 /* Handle multiple delimiters */ 1167 while (ISDIRDELIM(*nextname)) 1168 nextname++; 1169 if (dols && *nextname == '\0') 1170 firsttime = 0; 1171 } else { 1172 if (dols && firsttime) { 1173 firsttime = 0; 1174 } else { 1175 isdir = 0; 1176 } 1177 } 1178 1179 if (get_dentfromdir(mydata, startsect, subname, dentptr, 1180 isdir ? 0 : dols) == NULL) { 1181 if (dols && !isdir) 1182 *size = 0; 1183 goto exit; 1184 } 1185 1186 if (isdir && !(dentptr->attr & ATTR_DIR)) 1187 goto exit; 1188 1189 /* 1190 * If we are looking for a directory, and found a directory 1191 * type entry, and the entry is for the root directory (as 1192 * denoted by a cluster number of 0), jump back to the start 1193 * of the function, since at least on FAT12/16, the root dir 1194 * lives in a hard-coded location and needs special handling 1195 * to parse, rather than simply following the cluster linked 1196 * list in the FAT, like other directories. 1197 */ 1198 if (isdir && (dentptr->attr & ATTR_DIR) && !START(dentptr)) { 1199 /* 1200 * Modify the filename to remove the prefix that gets 1201 * back to the root directory, so the initial root dir 1202 * parsing code can continue from where we are without 1203 * confusion. 1204 */ 1205 strcpy(fnamecopy, nextname ?: ""); 1206 /* 1207 * Set up state the same way as the function does when 1208 * first started. This is required for the root dir 1209 * parsing code operates in its expected environment. 1210 */ 1211 subname = ""; 1212 cursect = mydata->rootdir_sect; 1213 isdir = 0; 1214 goto root_reparse; 1215 } 1216 1217 if (idx >= 0) 1218 subname = nextname; 1219 } 1220 1221 if (dogetsize) { 1222 *size = FAT2CPU32(dentptr->size); 1223 ret = 0; 1224 } else { 1225 ret = get_contents(mydata, dentptr, pos, buffer, maxsize, size); 1226 } 1227 debug("Size: %u, got: %llu\n", FAT2CPU32(dentptr->size), *size); 1228 1229 exit: 1230 free(mydata->fatbuf); 1231 return ret; 1232 } 1233 1234 int do_fat_read(const char *filename, void *buffer, loff_t maxsize, int dols, 1235 loff_t *actread) 1236 { 1237 return do_fat_read_at(filename, 0, buffer, maxsize, dols, 0, actread); 1238 } 1239 1240 int file_fat_detectfs(void) 1241 { 1242 boot_sector bs; 1243 volume_info volinfo; 1244 int fatsize; 1245 char vol_label[12]; 1246 1247 if (cur_dev == NULL) { 1248 printf("No current device\n"); 1249 return 1; 1250 } 1251 1252 #if defined(CONFIG_CMD_IDE) || \ 1253 defined(CONFIG_CMD_SATA) || \ 1254 defined(CONFIG_SCSI) || \ 1255 defined(CONFIG_CMD_USB) || \ 1256 defined(CONFIG_MMC) 1257 printf("Interface: "); 1258 switch (cur_dev->if_type) { 1259 case IF_TYPE_IDE: 1260 printf("IDE"); 1261 break; 1262 case IF_TYPE_SATA: 1263 printf("SATA"); 1264 break; 1265 case IF_TYPE_SCSI: 1266 printf("SCSI"); 1267 break; 1268 case IF_TYPE_ATAPI: 1269 printf("ATAPI"); 1270 break; 1271 case IF_TYPE_USB: 1272 printf("USB"); 1273 break; 1274 case IF_TYPE_DOC: 1275 printf("DOC"); 1276 break; 1277 case IF_TYPE_MMC: 1278 printf("MMC"); 1279 break; 1280 default: 1281 printf("Unknown"); 1282 } 1283 1284 printf("\n Device %d: ", cur_dev->devnum); 1285 dev_print(cur_dev); 1286 #endif 1287 1288 if (read_bootsectandvi(&bs, &volinfo, &fatsize)) { 1289 printf("\nNo valid FAT fs found\n"); 1290 return 1; 1291 } 1292 1293 memcpy(vol_label, volinfo.volume_label, 11); 1294 vol_label[11] = '\0'; 1295 volinfo.fs_type[5] = '\0'; 1296 1297 printf("Filesystem: %s \"%s\"\n", volinfo.fs_type, vol_label); 1298 1299 return 0; 1300 } 1301 1302 int file_fat_ls(const char *dir) 1303 { 1304 loff_t size; 1305 1306 return do_fat_read(dir, NULL, 0, LS_YES, &size); 1307 } 1308 1309 int fat_exists(const char *filename) 1310 { 1311 int ret; 1312 loff_t size; 1313 1314 ret = do_fat_read_at(filename, 0, NULL, 0, LS_NO, 1, &size); 1315 return ret == 0; 1316 } 1317 1318 int fat_size(const char *filename, loff_t *size) 1319 { 1320 return do_fat_read_at(filename, 0, NULL, 0, LS_NO, 1, size); 1321 } 1322 1323 int file_fat_read_at(const char *filename, loff_t pos, void *buffer, 1324 loff_t maxsize, loff_t *actread) 1325 { 1326 printf("reading %s\n", filename); 1327 return do_fat_read_at(filename, pos, buffer, maxsize, LS_NO, 0, 1328 actread); 1329 } 1330 1331 int file_fat_read(const char *filename, void *buffer, int maxsize) 1332 { 1333 loff_t actread; 1334 int ret; 1335 1336 ret = file_fat_read_at(filename, 0, buffer, maxsize, &actread); 1337 if (ret) 1338 return ret; 1339 else 1340 return actread; 1341 } 1342 1343 int fat_read_file(const char *filename, void *buf, loff_t offset, loff_t len, 1344 loff_t *actread) 1345 { 1346 int ret; 1347 1348 ret = file_fat_read_at(filename, offset, buf, len, actread); 1349 if (ret) 1350 printf("** Unable to read file %s **\n", filename); 1351 1352 return ret; 1353 } 1354 1355 void fat_close(void) 1356 { 1357 } 1358