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