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 <config.h> 14 #include <exports.h> 15 #include <fat.h> 16 #include <asm/byteorder.h> 17 #include <part.h> 18 #include <malloc.h> 19 #include <linux/compiler.h> 20 #include <linux/ctype.h> 21 22 #ifdef CONFIG_SUPPORT_VFAT 23 static const int vfat_enabled = 1; 24 #else 25 static const int vfat_enabled = 0; 26 #endif 27 28 /* 29 * Convert a string to lowercase. 30 */ 31 static void downcase(char *str) 32 { 33 while (*str != '\0') { 34 *str = tolower(*str); 35 str++; 36 } 37 } 38 39 static block_dev_desc_t *cur_dev; 40 static disk_partition_t cur_part_info; 41 42 #define DOS_BOOT_MAGIC_OFFSET 0x1fe 43 #define DOS_FS_TYPE_OFFSET 0x36 44 #define DOS_FS32_TYPE_OFFSET 0x52 45 46 static int disk_read(__u32 block, __u32 nr_blocks, void *buf) 47 { 48 if (!cur_dev || !cur_dev->block_read) 49 return -1; 50 51 return cur_dev->block_read(cur_dev->dev, 52 cur_part_info.start + block, nr_blocks, buf); 53 } 54 55 int fat_set_blk_dev(block_dev_desc_t *dev_desc, disk_partition_t *info) 56 { 57 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz); 58 59 cur_dev = dev_desc; 60 cur_part_info = *info; 61 62 /* Make sure it has a valid FAT header */ 63 if (disk_read(0, 1, buffer) != 1) { 64 cur_dev = NULL; 65 return -1; 66 } 67 68 /* Check if it's actually a DOS volume */ 69 if (memcmp(buffer + DOS_BOOT_MAGIC_OFFSET, "\x55\xAA", 2)) { 70 cur_dev = NULL; 71 return -1; 72 } 73 74 /* Check for FAT12/FAT16/FAT32 filesystem */ 75 if (!memcmp(buffer + DOS_FS_TYPE_OFFSET, "FAT", 3)) 76 return 0; 77 if (!memcmp(buffer + DOS_FS32_TYPE_OFFSET, "FAT32", 5)) 78 return 0; 79 80 cur_dev = NULL; 81 return -1; 82 } 83 84 int fat_register_device(block_dev_desc_t *dev_desc, int part_no) 85 { 86 disk_partition_t info; 87 88 /* First close any currently found FAT filesystem */ 89 cur_dev = NULL; 90 91 /* Read the partition table, if present */ 92 if (get_partition_info(dev_desc, part_no, &info)) { 93 if (part_no != 0) { 94 printf("** Partition %d not valid on device %d **\n", 95 part_no, dev_desc->dev); 96 return -1; 97 } 98 99 info.start = 0; 100 info.size = dev_desc->lba; 101 info.blksz = dev_desc->blksz; 102 info.name[0] = 0; 103 info.type[0] = 0; 104 info.bootable = 0; 105 #ifdef CONFIG_PARTITION_UUIDS 106 info.uuid[0] = 0; 107 #endif 108 } 109 110 return fat_set_blk_dev(dev_desc, &info); 111 } 112 113 /* 114 * Get the first occurence of a directory delimiter ('/' or '\') in a string. 115 * Return index into string if found, -1 otherwise. 116 */ 117 static int dirdelim(char *str) 118 { 119 char *start = str; 120 121 while (*str != '\0') { 122 if (ISDIRDELIM(*str)) 123 return str - start; 124 str++; 125 } 126 return -1; 127 } 128 129 /* 130 * Extract zero terminated short name from a directory entry. 131 */ 132 static void get_name(dir_entry *dirent, char *s_name) 133 { 134 char *ptr; 135 136 memcpy(s_name, dirent->name, 8); 137 s_name[8] = '\0'; 138 ptr = s_name; 139 while (*ptr && *ptr != ' ') 140 ptr++; 141 if (dirent->ext[0] && dirent->ext[0] != ' ') { 142 *ptr = '.'; 143 ptr++; 144 memcpy(ptr, dirent->ext, 3); 145 ptr[3] = '\0'; 146 while (*ptr && *ptr != ' ') 147 ptr++; 148 } 149 *ptr = '\0'; 150 if (*s_name == DELETED_FLAG) 151 *s_name = '\0'; 152 else if (*s_name == aRING) 153 *s_name = DELETED_FLAG; 154 downcase(s_name); 155 } 156 157 /* 158 * Get the entry at index 'entry' in a FAT (12/16/32) table. 159 * On failure 0x00 is returned. 160 */ 161 static __u32 get_fatent(fsdata *mydata, __u32 entry) 162 { 163 __u32 bufnum; 164 __u32 off16, offset; 165 __u32 ret = 0x00; 166 __u16 val1, val2; 167 168 switch (mydata->fatsize) { 169 case 32: 170 bufnum = entry / FAT32BUFSIZE; 171 offset = entry - bufnum * FAT32BUFSIZE; 172 break; 173 case 16: 174 bufnum = entry / FAT16BUFSIZE; 175 offset = entry - bufnum * FAT16BUFSIZE; 176 break; 177 case 12: 178 bufnum = entry / FAT12BUFSIZE; 179 offset = entry - bufnum * FAT12BUFSIZE; 180 break; 181 182 default: 183 /* Unsupported FAT size */ 184 return ret; 185 } 186 187 debug("FAT%d: entry: 0x%04x = %d, offset: 0x%04x = %d\n", 188 mydata->fatsize, entry, entry, offset, offset); 189 190 /* Read a new block of FAT entries into the cache. */ 191 if (bufnum != mydata->fatbufnum) { 192 __u32 getsize = FATBUFBLOCKS; 193 __u8 *bufptr = mydata->fatbuf; 194 __u32 fatlength = mydata->fatlength; 195 __u32 startblock = bufnum * FATBUFBLOCKS; 196 197 if (startblock + getsize > fatlength) 198 getsize = fatlength - startblock; 199 200 startblock += mydata->fat_sect; /* Offset from start of disk */ 201 202 if (disk_read(startblock, getsize, bufptr) < 0) { 203 debug("Error reading FAT blocks\n"); 204 return ret; 205 } 206 mydata->fatbufnum = bufnum; 207 } 208 209 /* Get the actual entry from the table */ 210 switch (mydata->fatsize) { 211 case 32: 212 ret = FAT2CPU32(((__u32 *) mydata->fatbuf)[offset]); 213 break; 214 case 16: 215 ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[offset]); 216 break; 217 case 12: 218 off16 = (offset * 3) / 4; 219 220 switch (offset & 0x3) { 221 case 0: 222 ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[off16]); 223 ret &= 0xfff; 224 break; 225 case 1: 226 val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]); 227 val1 &= 0xf000; 228 val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]); 229 val2 &= 0x00ff; 230 ret = (val2 << 4) | (val1 >> 12); 231 break; 232 case 2: 233 val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]); 234 val1 &= 0xff00; 235 val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]); 236 val2 &= 0x000f; 237 ret = (val2 << 8) | (val1 >> 8); 238 break; 239 case 3: 240 ret = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]); 241 ret = (ret & 0xfff0) >> 4; 242 break; 243 default: 244 break; 245 } 246 break; 247 } 248 debug("FAT%d: ret: %08x, offset: %04x\n", 249 mydata->fatsize, ret, offset); 250 251 return ret; 252 } 253 254 /* 255 * Read at most 'size' bytes from the specified cluster into 'buffer'. 256 * Return 0 on success, -1 otherwise. 257 */ 258 static int 259 get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size) 260 { 261 __u32 idx = 0; 262 __u32 startsect; 263 int ret; 264 265 if (clustnum > 0) { 266 startsect = mydata->data_begin + 267 clustnum * mydata->clust_size; 268 } else { 269 startsect = mydata->rootdir_sect; 270 } 271 272 debug("gc - clustnum: %d, startsect: %d\n", clustnum, startsect); 273 274 if ((unsigned long)buffer & (ARCH_DMA_MINALIGN - 1)) { 275 ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size); 276 277 printf("FAT: Misaligned buffer address (%p)\n", buffer); 278 279 while (size >= mydata->sect_size) { 280 ret = disk_read(startsect++, 1, tmpbuf); 281 if (ret != 1) { 282 debug("Error reading data (got %d)\n", ret); 283 return -1; 284 } 285 286 memcpy(buffer, tmpbuf, mydata->sect_size); 287 buffer += mydata->sect_size; 288 size -= mydata->sect_size; 289 } 290 } else { 291 idx = size / mydata->sect_size; 292 ret = disk_read(startsect, idx, buffer); 293 if (ret != idx) { 294 debug("Error reading data (got %d)\n", ret); 295 return -1; 296 } 297 startsect += idx; 298 idx *= mydata->sect_size; 299 buffer += idx; 300 size -= idx; 301 } 302 if (size) { 303 ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size); 304 305 ret = disk_read(startsect, 1, tmpbuf); 306 if (ret != 1) { 307 debug("Error reading data (got %d)\n", ret); 308 return -1; 309 } 310 311 memcpy(buffer, tmpbuf, size); 312 } 313 314 return 0; 315 } 316 317 /* 318 * Read at most 'maxsize' bytes from 'pos' in the file associated with 'dentptr' 319 * into 'buffer'. 320 * Update the number of bytes read in *gotsize or return -1 on fatal errors. 321 */ 322 __u8 get_contents_vfatname_block[MAX_CLUSTSIZE] 323 __aligned(ARCH_DMA_MINALIGN); 324 325 static int get_contents(fsdata *mydata, dir_entry *dentptr, loff_t pos, 326 __u8 *buffer, loff_t maxsize, loff_t *gotsize) 327 { 328 loff_t filesize = FAT2CPU32(dentptr->size); 329 unsigned int bytesperclust = mydata->clust_size * mydata->sect_size; 330 __u32 curclust = START(dentptr); 331 __u32 endclust, newclust; 332 loff_t actsize; 333 334 *gotsize = 0; 335 debug("Filesize: %llu bytes\n", filesize); 336 337 if (pos >= filesize) { 338 debug("Read position past EOF: %llu\n", pos); 339 return 0; 340 } 341 342 if (maxsize > 0 && filesize > pos + maxsize) 343 filesize = pos + maxsize; 344 345 debug("%llu bytes\n", filesize); 346 347 actsize = bytesperclust; 348 349 /* go to cluster at pos */ 350 while (actsize <= pos) { 351 curclust = get_fatent(mydata, curclust); 352 if (CHECK_CLUST(curclust, mydata->fatsize)) { 353 debug("curclust: 0x%x\n", curclust); 354 debug("Invalid FAT entry\n"); 355 return 0; 356 } 357 actsize += bytesperclust; 358 } 359 360 /* actsize > pos */ 361 actsize -= bytesperclust; 362 filesize -= actsize; 363 pos -= actsize; 364 365 /* align to beginning of next cluster if any */ 366 if (pos) { 367 actsize = min(filesize, (loff_t)bytesperclust); 368 if (get_cluster(mydata, curclust, get_contents_vfatname_block, 369 (int)actsize) != 0) { 370 printf("Error reading cluster\n"); 371 return -1; 372 } 373 filesize -= actsize; 374 actsize -= pos; 375 memcpy(buffer, get_contents_vfatname_block + pos, actsize); 376 *gotsize += actsize; 377 if (!filesize) 378 return 0; 379 buffer += actsize; 380 381 curclust = get_fatent(mydata, curclust); 382 if (CHECK_CLUST(curclust, mydata->fatsize)) { 383 debug("curclust: 0x%x\n", curclust); 384 debug("Invalid FAT entry\n"); 385 return 0; 386 } 387 } 388 389 actsize = bytesperclust; 390 endclust = curclust; 391 392 do { 393 /* search for consecutive clusters */ 394 while (actsize < filesize) { 395 newclust = get_fatent(mydata, endclust); 396 if ((newclust - 1) != endclust) 397 goto getit; 398 if (CHECK_CLUST(newclust, mydata->fatsize)) { 399 debug("curclust: 0x%x\n", newclust); 400 debug("Invalid FAT entry\n"); 401 return 0; 402 } 403 endclust = newclust; 404 actsize += bytesperclust; 405 } 406 407 /* get remaining bytes */ 408 actsize = filesize; 409 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 410 printf("Error reading cluster\n"); 411 return -1; 412 } 413 *gotsize += actsize; 414 return 0; 415 getit: 416 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 417 printf("Error reading cluster\n"); 418 return -1; 419 } 420 *gotsize += (int)actsize; 421 filesize -= actsize; 422 buffer += actsize; 423 424 curclust = get_fatent(mydata, endclust); 425 if (CHECK_CLUST(curclust, mydata->fatsize)) { 426 debug("curclust: 0x%x\n", curclust); 427 printf("Invalid FAT entry\n"); 428 return 0; 429 } 430 actsize = bytesperclust; 431 endclust = curclust; 432 } while (1); 433 } 434 435 /* 436 * Extract the file name information from 'slotptr' into 'l_name', 437 * starting at l_name[*idx]. 438 * Return 1 if terminator (zero byte) is found, 0 otherwise. 439 */ 440 static int slot2str(dir_slot *slotptr, char *l_name, int *idx) 441 { 442 int j; 443 444 for (j = 0; j <= 8; j += 2) { 445 l_name[*idx] = slotptr->name0_4[j]; 446 if (l_name[*idx] == 0x00) 447 return 1; 448 (*idx)++; 449 } 450 for (j = 0; j <= 10; j += 2) { 451 l_name[*idx] = slotptr->name5_10[j]; 452 if (l_name[*idx] == 0x00) 453 return 1; 454 (*idx)++; 455 } 456 for (j = 0; j <= 2; j += 2) { 457 l_name[*idx] = slotptr->name11_12[j]; 458 if (l_name[*idx] == 0x00) 459 return 1; 460 (*idx)++; 461 } 462 463 return 0; 464 } 465 466 /* 467 * Extract the full long filename starting at 'retdent' (which is really 468 * a slot) into 'l_name'. If successful also copy the real directory entry 469 * into 'retdent' 470 * Return 0 on success, -1 otherwise. 471 */ 472 static int 473 get_vfatname(fsdata *mydata, int curclust, __u8 *cluster, 474 dir_entry *retdent, char *l_name) 475 { 476 dir_entry *realdent; 477 dir_slot *slotptr = (dir_slot *)retdent; 478 __u8 *buflimit = cluster + mydata->sect_size * ((curclust == 0) ? 479 PREFETCH_BLOCKS : 480 mydata->clust_size); 481 __u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff; 482 int idx = 0; 483 484 if (counter > VFAT_MAXSEQ) { 485 debug("Error: VFAT name is too long\n"); 486 return -1; 487 } 488 489 while ((__u8 *)slotptr < buflimit) { 490 if (counter == 0) 491 break; 492 if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter) 493 return -1; 494 slotptr++; 495 counter--; 496 } 497 498 if ((__u8 *)slotptr >= buflimit) { 499 dir_slot *slotptr2; 500 501 if (curclust == 0) 502 return -1; 503 curclust = get_fatent(mydata, curclust); 504 if (CHECK_CLUST(curclust, mydata->fatsize)) { 505 debug("curclust: 0x%x\n", curclust); 506 printf("Invalid FAT entry\n"); 507 return -1; 508 } 509 510 if (get_cluster(mydata, curclust, get_contents_vfatname_block, 511 mydata->clust_size * mydata->sect_size) != 0) { 512 debug("Error: reading directory block\n"); 513 return -1; 514 } 515 516 slotptr2 = (dir_slot *)get_contents_vfatname_block; 517 while (counter > 0) { 518 if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK) 519 & 0xff) != counter) 520 return -1; 521 slotptr2++; 522 counter--; 523 } 524 525 /* Save the real directory entry */ 526 realdent = (dir_entry *)slotptr2; 527 while ((__u8 *)slotptr2 > get_contents_vfatname_block) { 528 slotptr2--; 529 slot2str(slotptr2, l_name, &idx); 530 } 531 } else { 532 /* Save the real directory entry */ 533 realdent = (dir_entry *)slotptr; 534 } 535 536 do { 537 slotptr--; 538 if (slot2str(slotptr, l_name, &idx)) 539 break; 540 } while (!(slotptr->id & LAST_LONG_ENTRY_MASK)); 541 542 l_name[idx] = '\0'; 543 if (*l_name == DELETED_FLAG) 544 *l_name = '\0'; 545 else if (*l_name == aRING) 546 *l_name = DELETED_FLAG; 547 downcase(l_name); 548 549 /* Return the real directory entry */ 550 memcpy(retdent, realdent, sizeof(dir_entry)); 551 552 return 0; 553 } 554 555 /* Calculate short name checksum */ 556 static __u8 mkcksum(const char name[8], const char ext[3]) 557 { 558 int i; 559 560 __u8 ret = 0; 561 562 for (i = 0; i < 8; i++) 563 ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + name[i]; 564 for (i = 0; i < 3; i++) 565 ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + ext[i]; 566 567 return ret; 568 } 569 570 /* 571 * Get the directory entry associated with 'filename' from the directory 572 * starting at 'startsect' 573 */ 574 __u8 get_dentfromdir_block[MAX_CLUSTSIZE] 575 __aligned(ARCH_DMA_MINALIGN); 576 577 static dir_entry *get_dentfromdir(fsdata *mydata, int startsect, 578 char *filename, dir_entry *retdent, 579 int dols) 580 { 581 __u16 prevcksum = 0xffff; 582 __u32 curclust = START(retdent); 583 int files = 0, dirs = 0; 584 585 debug("get_dentfromdir: %s\n", filename); 586 587 while (1) { 588 dir_entry *dentptr; 589 590 int i; 591 592 if (get_cluster(mydata, curclust, get_dentfromdir_block, 593 mydata->clust_size * mydata->sect_size) != 0) { 594 debug("Error: reading directory block\n"); 595 return NULL; 596 } 597 598 dentptr = (dir_entry *)get_dentfromdir_block; 599 600 for (i = 0; i < DIRENTSPERCLUST; i++) { 601 char s_name[14], l_name[VFAT_MAXLEN_BYTES]; 602 603 l_name[0] = '\0'; 604 if (dentptr->name[0] == DELETED_FLAG) { 605 dentptr++; 606 continue; 607 } 608 if ((dentptr->attr & ATTR_VOLUME)) { 609 if (vfat_enabled && 610 (dentptr->attr & ATTR_VFAT) == ATTR_VFAT && 611 (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) { 612 prevcksum = ((dir_slot *)dentptr)->alias_checksum; 613 get_vfatname(mydata, curclust, 614 get_dentfromdir_block, 615 dentptr, l_name); 616 if (dols) { 617 int isdir; 618 char dirc; 619 int doit = 0; 620 621 isdir = (dentptr->attr & ATTR_DIR); 622 623 if (isdir) { 624 dirs++; 625 dirc = '/'; 626 doit = 1; 627 } else { 628 dirc = ' '; 629 if (l_name[0] != 0) { 630 files++; 631 doit = 1; 632 } 633 } 634 if (doit) { 635 if (dirc == ' ') { 636 printf(" %8u %s%c\n", 637 FAT2CPU32(dentptr->size), 638 l_name, 639 dirc); 640 } else { 641 printf(" %s%c\n", 642 l_name, 643 dirc); 644 } 645 } 646 dentptr++; 647 continue; 648 } 649 debug("vfatname: |%s|\n", l_name); 650 } else { 651 /* Volume label or VFAT entry */ 652 dentptr++; 653 continue; 654 } 655 } 656 if (dentptr->name[0] == 0) { 657 if (dols) { 658 printf("\n%d file(s), %d dir(s)\n\n", 659 files, dirs); 660 } 661 debug("Dentname == NULL - %d\n", i); 662 return NULL; 663 } 664 if (vfat_enabled) { 665 __u8 csum = mkcksum(dentptr->name, dentptr->ext); 666 if (dols && csum == prevcksum) { 667 prevcksum = 0xffff; 668 dentptr++; 669 continue; 670 } 671 } 672 673 get_name(dentptr, s_name); 674 if (dols) { 675 int isdir = (dentptr->attr & ATTR_DIR); 676 char dirc; 677 int doit = 0; 678 679 if (isdir) { 680 dirs++; 681 dirc = '/'; 682 doit = 1; 683 } else { 684 dirc = ' '; 685 if (s_name[0] != 0) { 686 files++; 687 doit = 1; 688 } 689 } 690 691 if (doit) { 692 if (dirc == ' ') { 693 printf(" %8u %s%c\n", 694 FAT2CPU32(dentptr->size), 695 s_name, dirc); 696 } else { 697 printf(" %s%c\n", 698 s_name, dirc); 699 } 700 } 701 702 dentptr++; 703 continue; 704 } 705 706 if (strcmp(filename, s_name) 707 && strcmp(filename, l_name)) { 708 debug("Mismatch: |%s|%s|\n", s_name, l_name); 709 dentptr++; 710 continue; 711 } 712 713 memcpy(retdent, dentptr, sizeof(dir_entry)); 714 715 debug("DentName: %s", s_name); 716 debug(", start: 0x%x", START(dentptr)); 717 debug(", size: 0x%x %s\n", 718 FAT2CPU32(dentptr->size), 719 (dentptr->attr & ATTR_DIR) ? "(DIR)" : ""); 720 721 return retdent; 722 } 723 724 curclust = get_fatent(mydata, curclust); 725 if (CHECK_CLUST(curclust, mydata->fatsize)) { 726 debug("curclust: 0x%x\n", curclust); 727 printf("Invalid FAT entry\n"); 728 return NULL; 729 } 730 } 731 732 return NULL; 733 } 734 735 /* 736 * Read boot sector and volume info from a FAT filesystem 737 */ 738 static int 739 read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize) 740 { 741 __u8 *block; 742 volume_info *vistart; 743 int ret = 0; 744 745 if (cur_dev == NULL) { 746 debug("Error: no device selected\n"); 747 return -1; 748 } 749 750 block = memalign(ARCH_DMA_MINALIGN, cur_dev->blksz); 751 if (block == NULL) { 752 debug("Error: allocating block\n"); 753 return -1; 754 } 755 756 if (disk_read(0, 1, block) < 0) { 757 debug("Error: reading block\n"); 758 goto fail; 759 } 760 761 memcpy(bs, block, sizeof(boot_sector)); 762 bs->reserved = FAT2CPU16(bs->reserved); 763 bs->fat_length = FAT2CPU16(bs->fat_length); 764 bs->secs_track = FAT2CPU16(bs->secs_track); 765 bs->heads = FAT2CPU16(bs->heads); 766 bs->total_sect = FAT2CPU32(bs->total_sect); 767 768 /* FAT32 entries */ 769 if (bs->fat_length == 0) { 770 /* Assume FAT32 */ 771 bs->fat32_length = FAT2CPU32(bs->fat32_length); 772 bs->flags = FAT2CPU16(bs->flags); 773 bs->root_cluster = FAT2CPU32(bs->root_cluster); 774 bs->info_sector = FAT2CPU16(bs->info_sector); 775 bs->backup_boot = FAT2CPU16(bs->backup_boot); 776 vistart = (volume_info *)(block + sizeof(boot_sector)); 777 *fatsize = 32; 778 } else { 779 vistart = (volume_info *)&(bs->fat32_length); 780 *fatsize = 0; 781 } 782 memcpy(volinfo, vistart, sizeof(volume_info)); 783 784 if (*fatsize == 32) { 785 if (strncmp(FAT32_SIGN, vistart->fs_type, SIGNLEN) == 0) 786 goto exit; 787 } else { 788 if (strncmp(FAT12_SIGN, vistart->fs_type, SIGNLEN) == 0) { 789 *fatsize = 12; 790 goto exit; 791 } 792 if (strncmp(FAT16_SIGN, vistart->fs_type, SIGNLEN) == 0) { 793 *fatsize = 16; 794 goto exit; 795 } 796 } 797 798 debug("Error: broken fs_type sign\n"); 799 fail: 800 ret = -1; 801 exit: 802 free(block); 803 return ret; 804 } 805 806 __u8 do_fat_read_at_block[MAX_CLUSTSIZE] 807 __aligned(ARCH_DMA_MINALIGN); 808 809 int do_fat_read_at(const char *filename, loff_t pos, void *buffer, 810 loff_t maxsize, int dols, int dogetsize, loff_t *size) 811 { 812 char fnamecopy[2048]; 813 boot_sector bs; 814 volume_info volinfo; 815 fsdata datablock; 816 fsdata *mydata = &datablock; 817 dir_entry *dentptr = NULL; 818 __u16 prevcksum = 0xffff; 819 char *subname = ""; 820 __u32 cursect; 821 int idx, isdir = 0; 822 int files = 0, dirs = 0; 823 int ret = -1; 824 int firsttime; 825 __u32 root_cluster = 0; 826 int rootdir_size = 0; 827 int j; 828 829 if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) { 830 debug("Error: reading boot sector\n"); 831 return -1; 832 } 833 834 if (mydata->fatsize == 32) { 835 root_cluster = bs.root_cluster; 836 mydata->fatlength = bs.fat32_length; 837 } else { 838 mydata->fatlength = bs.fat_length; 839 } 840 841 mydata->fat_sect = bs.reserved; 842 843 cursect = mydata->rootdir_sect 844 = mydata->fat_sect + mydata->fatlength * bs.fats; 845 846 mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0]; 847 mydata->clust_size = bs.cluster_size; 848 if (mydata->sect_size != cur_part_info.blksz) { 849 printf("Error: FAT sector size mismatch (fs=%hu, dev=%lu)\n", 850 mydata->sect_size, cur_part_info.blksz); 851 return -1; 852 } 853 854 if (mydata->fatsize == 32) { 855 mydata->data_begin = mydata->rootdir_sect - 856 (mydata->clust_size * 2); 857 } else { 858 rootdir_size = ((bs.dir_entries[1] * (int)256 + 859 bs.dir_entries[0]) * 860 sizeof(dir_entry)) / 861 mydata->sect_size; 862 mydata->data_begin = mydata->rootdir_sect + 863 rootdir_size - 864 (mydata->clust_size * 2); 865 } 866 867 mydata->fatbufnum = -1; 868 mydata->fatbuf = memalign(ARCH_DMA_MINALIGN, FATBUFSIZE); 869 if (mydata->fatbuf == NULL) { 870 debug("Error: allocating memory\n"); 871 return -1; 872 } 873 874 if (vfat_enabled) 875 debug("VFAT Support enabled\n"); 876 877 debug("FAT%d, fat_sect: %d, fatlength: %d\n", 878 mydata->fatsize, mydata->fat_sect, mydata->fatlength); 879 debug("Rootdir begins at cluster: %d, sector: %d, offset: %x\n" 880 "Data begins at: %d\n", 881 root_cluster, 882 mydata->rootdir_sect, 883 mydata->rootdir_sect * mydata->sect_size, mydata->data_begin); 884 debug("Sector size: %d, cluster size: %d\n", mydata->sect_size, 885 mydata->clust_size); 886 887 /* "cwd" is always the root... */ 888 while (ISDIRDELIM(*filename)) 889 filename++; 890 891 /* Make a copy of the filename and convert it to lowercase */ 892 strcpy(fnamecopy, filename); 893 downcase(fnamecopy); 894 895 if (*fnamecopy == '\0') { 896 if (!dols) 897 goto exit; 898 899 dols = LS_ROOT; 900 } else if ((idx = dirdelim(fnamecopy)) >= 0) { 901 isdir = 1; 902 fnamecopy[idx] = '\0'; 903 subname = fnamecopy + idx + 1; 904 905 /* Handle multiple delimiters */ 906 while (ISDIRDELIM(*subname)) 907 subname++; 908 } else if (dols) { 909 isdir = 1; 910 } 911 912 j = 0; 913 while (1) { 914 int i; 915 916 if (j == 0) { 917 debug("FAT read sect=%d, clust_size=%d, DIRENTSPERBLOCK=%zd\n", 918 cursect, mydata->clust_size, DIRENTSPERBLOCK); 919 920 if (disk_read(cursect, 921 (mydata->fatsize == 32) ? 922 (mydata->clust_size) : 923 PREFETCH_BLOCKS, 924 do_fat_read_at_block) < 0) { 925 debug("Error: reading rootdir block\n"); 926 goto exit; 927 } 928 929 dentptr = (dir_entry *) do_fat_read_at_block; 930 } 931 932 for (i = 0; i < DIRENTSPERBLOCK; i++) { 933 char s_name[14], l_name[VFAT_MAXLEN_BYTES]; 934 __u8 csum; 935 936 l_name[0] = '\0'; 937 if (dentptr->name[0] == DELETED_FLAG) { 938 dentptr++; 939 continue; 940 } 941 942 if (vfat_enabled) 943 csum = mkcksum(dentptr->name, dentptr->ext); 944 945 if (dentptr->attr & ATTR_VOLUME) { 946 if (vfat_enabled && 947 (dentptr->attr & ATTR_VFAT) == ATTR_VFAT && 948 (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) { 949 prevcksum = 950 ((dir_slot *)dentptr)->alias_checksum; 951 952 get_vfatname(mydata, 953 root_cluster, 954 do_fat_read_at_block, 955 dentptr, l_name); 956 957 if (dols == LS_ROOT) { 958 char dirc; 959 int doit = 0; 960 int isdir = 961 (dentptr->attr & ATTR_DIR); 962 963 if (isdir) { 964 dirs++; 965 dirc = '/'; 966 doit = 1; 967 } else { 968 dirc = ' '; 969 if (l_name[0] != 0) { 970 files++; 971 doit = 1; 972 } 973 } 974 if (doit) { 975 if (dirc == ' ') { 976 printf(" %8u %s%c\n", 977 FAT2CPU32(dentptr->size), 978 l_name, 979 dirc); 980 } else { 981 printf(" %s%c\n", 982 l_name, 983 dirc); 984 } 985 } 986 dentptr++; 987 continue; 988 } 989 debug("Rootvfatname: |%s|\n", 990 l_name); 991 } else { 992 /* Volume label or VFAT entry */ 993 dentptr++; 994 continue; 995 } 996 } else if (dentptr->name[0] == 0) { 997 debug("RootDentname == NULL - %d\n", i); 998 if (dols == LS_ROOT) { 999 printf("\n%d file(s), %d dir(s)\n\n", 1000 files, dirs); 1001 ret = 0; 1002 } 1003 goto exit; 1004 } 1005 else if (vfat_enabled && 1006 dols == LS_ROOT && csum == prevcksum) { 1007 prevcksum = 0xffff; 1008 dentptr++; 1009 continue; 1010 } 1011 1012 get_name(dentptr, s_name); 1013 1014 if (dols == LS_ROOT) { 1015 int isdir = (dentptr->attr & ATTR_DIR); 1016 char dirc; 1017 int doit = 0; 1018 1019 if (isdir) { 1020 dirc = '/'; 1021 if (s_name[0] != 0) { 1022 dirs++; 1023 doit = 1; 1024 } 1025 } else { 1026 dirc = ' '; 1027 if (s_name[0] != 0) { 1028 files++; 1029 doit = 1; 1030 } 1031 } 1032 if (doit) { 1033 if (dirc == ' ') { 1034 printf(" %8u %s%c\n", 1035 FAT2CPU32(dentptr->size), 1036 s_name, dirc); 1037 } else { 1038 printf(" %s%c\n", 1039 s_name, dirc); 1040 } 1041 } 1042 dentptr++; 1043 continue; 1044 } 1045 1046 if (strcmp(fnamecopy, s_name) 1047 && strcmp(fnamecopy, l_name)) { 1048 debug("RootMismatch: |%s|%s|\n", s_name, 1049 l_name); 1050 dentptr++; 1051 continue; 1052 } 1053 1054 if (isdir && !(dentptr->attr & ATTR_DIR)) 1055 goto exit; 1056 1057 debug("RootName: %s", s_name); 1058 debug(", start: 0x%x", START(dentptr)); 1059 debug(", size: 0x%x %s\n", 1060 FAT2CPU32(dentptr->size), 1061 isdir ? "(DIR)" : ""); 1062 1063 goto rootdir_done; /* We got a match */ 1064 } 1065 debug("END LOOP: j=%d clust_size=%d\n", j, 1066 mydata->clust_size); 1067 1068 /* 1069 * On FAT32 we must fetch the FAT entries for the next 1070 * root directory clusters when a cluster has been 1071 * completely processed. 1072 */ 1073 ++j; 1074 int rootdir_end = 0; 1075 if (mydata->fatsize == 32) { 1076 if (j == mydata->clust_size) { 1077 int nxtsect = 0; 1078 int nxt_clust = 0; 1079 1080 nxt_clust = get_fatent(mydata, root_cluster); 1081 rootdir_end = CHECK_CLUST(nxt_clust, 32); 1082 1083 nxtsect = mydata->data_begin + 1084 (nxt_clust * mydata->clust_size); 1085 1086 root_cluster = nxt_clust; 1087 1088 cursect = nxtsect; 1089 j = 0; 1090 } 1091 } else { 1092 if (j == PREFETCH_BLOCKS) 1093 j = 0; 1094 1095 rootdir_end = (++cursect - mydata->rootdir_sect >= 1096 rootdir_size); 1097 } 1098 1099 /* If end of rootdir reached */ 1100 if (rootdir_end) { 1101 if (dols == LS_ROOT) { 1102 printf("\n%d file(s), %d dir(s)\n\n", 1103 files, dirs); 1104 *size = 0; 1105 } 1106 goto exit; 1107 } 1108 } 1109 rootdir_done: 1110 1111 firsttime = 1; 1112 1113 while (isdir) { 1114 int startsect = mydata->data_begin 1115 + START(dentptr) * mydata->clust_size; 1116 dir_entry dent; 1117 char *nextname = NULL; 1118 1119 dent = *dentptr; 1120 dentptr = &dent; 1121 1122 idx = dirdelim(subname); 1123 1124 if (idx >= 0) { 1125 subname[idx] = '\0'; 1126 nextname = subname + idx + 1; 1127 /* Handle multiple delimiters */ 1128 while (ISDIRDELIM(*nextname)) 1129 nextname++; 1130 if (dols && *nextname == '\0') 1131 firsttime = 0; 1132 } else { 1133 if (dols && firsttime) { 1134 firsttime = 0; 1135 } else { 1136 isdir = 0; 1137 } 1138 } 1139 1140 if (get_dentfromdir(mydata, startsect, subname, dentptr, 1141 isdir ? 0 : dols) == NULL) { 1142 if (dols && !isdir) 1143 *size = 0; 1144 goto exit; 1145 } 1146 1147 if (isdir && !(dentptr->attr & ATTR_DIR)) 1148 goto exit; 1149 1150 if (idx >= 0) 1151 subname = nextname; 1152 } 1153 1154 if (dogetsize) { 1155 *size = FAT2CPU32(dentptr->size); 1156 ret = 0; 1157 } else { 1158 ret = get_contents(mydata, dentptr, pos, buffer, maxsize, size); 1159 } 1160 debug("Size: %u, got: %llu\n", FAT2CPU32(dentptr->size), *size); 1161 1162 exit: 1163 free(mydata->fatbuf); 1164 return ret; 1165 } 1166 1167 int do_fat_read(const char *filename, void *buffer, loff_t maxsize, int dols, 1168 loff_t *actread) 1169 { 1170 return do_fat_read_at(filename, 0, buffer, maxsize, dols, 0, actread); 1171 } 1172 1173 int file_fat_detectfs(void) 1174 { 1175 boot_sector bs; 1176 volume_info volinfo; 1177 int fatsize; 1178 char vol_label[12]; 1179 1180 if (cur_dev == NULL) { 1181 printf("No current device\n"); 1182 return 1; 1183 } 1184 1185 #if defined(CONFIG_CMD_IDE) || \ 1186 defined(CONFIG_CMD_SATA) || \ 1187 defined(CONFIG_CMD_SCSI) || \ 1188 defined(CONFIG_CMD_USB) || \ 1189 defined(CONFIG_MMC) 1190 printf("Interface: "); 1191 switch (cur_dev->if_type) { 1192 case IF_TYPE_IDE: 1193 printf("IDE"); 1194 break; 1195 case IF_TYPE_SATA: 1196 printf("SATA"); 1197 break; 1198 case IF_TYPE_SCSI: 1199 printf("SCSI"); 1200 break; 1201 case IF_TYPE_ATAPI: 1202 printf("ATAPI"); 1203 break; 1204 case IF_TYPE_USB: 1205 printf("USB"); 1206 break; 1207 case IF_TYPE_DOC: 1208 printf("DOC"); 1209 break; 1210 case IF_TYPE_MMC: 1211 printf("MMC"); 1212 break; 1213 default: 1214 printf("Unknown"); 1215 } 1216 1217 printf("\n Device %d: ", cur_dev->dev); 1218 dev_print(cur_dev); 1219 #endif 1220 1221 if (read_bootsectandvi(&bs, &volinfo, &fatsize)) { 1222 printf("\nNo valid FAT fs found\n"); 1223 return 1; 1224 } 1225 1226 memcpy(vol_label, volinfo.volume_label, 11); 1227 vol_label[11] = '\0'; 1228 volinfo.fs_type[5] = '\0'; 1229 1230 printf("Filesystem: %s \"%s\"\n", volinfo.fs_type, vol_label); 1231 1232 return 0; 1233 } 1234 1235 int file_fat_ls(const char *dir) 1236 { 1237 loff_t size; 1238 1239 return do_fat_read(dir, NULL, 0, LS_YES, &size); 1240 } 1241 1242 int fat_exists(const char *filename) 1243 { 1244 int ret; 1245 loff_t size; 1246 1247 ret = do_fat_read_at(filename, 0, NULL, 0, LS_NO, 1, &size); 1248 return ret == 0; 1249 } 1250 1251 int fat_size(const char *filename, loff_t *size) 1252 { 1253 return do_fat_read_at(filename, 0, NULL, 0, LS_NO, 1, size); 1254 } 1255 1256 int file_fat_read_at(const char *filename, loff_t pos, void *buffer, 1257 loff_t maxsize, loff_t *actread) 1258 { 1259 printf("reading %s\n", filename); 1260 return do_fat_read_at(filename, pos, buffer, maxsize, LS_NO, 0, 1261 actread); 1262 } 1263 1264 int file_fat_read(const char *filename, void *buffer, int maxsize) 1265 { 1266 loff_t actread; 1267 int ret; 1268 1269 ret = file_fat_read_at(filename, 0, buffer, maxsize, &actread); 1270 if (ret) 1271 return ret; 1272 else 1273 return actread; 1274 } 1275 1276 int fat_read_file(const char *filename, void *buf, loff_t offset, loff_t len, 1277 loff_t *actread) 1278 { 1279 int ret; 1280 1281 ret = file_fat_read_at(filename, offset, buf, len, actread); 1282 if (ret) 1283 printf("** Unable to read file %s **\n", filename); 1284 1285 return ret; 1286 } 1287 1288 void fat_close(void) 1289 { 1290 } 1291