1 /* 2 * fat.c 3 * 4 * R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg 5 * 6 * 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6 7 * 2003-03-10 - kharris@nexus-tech.net - ported to uboot 8 * 9 * See file CREDITS for list of people who contributed to this 10 * project. 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License as 14 * published by the Free Software Foundation; either version 2 of 15 * the License, or (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 25 * MA 02111-1307 USA 26 */ 27 28 #include <common.h> 29 #include <config.h> 30 #include <exports.h> 31 #include <fat.h> 32 #include <asm/byteorder.h> 33 #include <part.h> 34 35 /* 36 * Convert a string to lowercase. 37 */ 38 static void downcase (char *str) 39 { 40 while (*str != '\0') { 41 TOLOWER(*str); 42 str++; 43 } 44 } 45 46 static block_dev_desc_t *cur_dev; 47 static unsigned int cur_part_nr; 48 static disk_partition_t cur_part_info; 49 50 #define DOS_BOOT_MAGIC_OFFSET 0x1fe 51 #define DOS_FS_TYPE_OFFSET 0x36 52 #define DOS_FS32_TYPE_OFFSET 0x52 53 54 static int disk_read(__u32 block, __u32 nr_blocks, void *buf) 55 { 56 if (!cur_dev || !cur_dev->block_read) 57 return -1; 58 59 return cur_dev->block_read(cur_dev->dev, 60 cur_part_info.start + block, nr_blocks, buf); 61 } 62 63 int fat_register_device (block_dev_desc_t * dev_desc, int part_no) 64 { 65 unsigned char buffer[dev_desc->blksz]; 66 67 /* First close any currently found FAT filesystem */ 68 cur_dev = NULL; 69 70 #if (defined(CONFIG_CMD_IDE) || \ 71 defined(CONFIG_CMD_MG_DISK) || \ 72 defined(CONFIG_CMD_SATA) || \ 73 defined(CONFIG_CMD_SCSI) || \ 74 defined(CONFIG_CMD_USB) || \ 75 defined(CONFIG_MMC) || \ 76 defined(CONFIG_SYSTEMACE) ) 77 78 /* Read the partition table, if present */ 79 if (!get_partition_info(dev_desc, part_no, &cur_part_info)) { 80 cur_dev = dev_desc; 81 cur_part_nr = part_no; 82 } 83 #endif 84 85 /* Otherwise it might be a superfloppy (whole-disk FAT filesystem) */ 86 if (!cur_dev) { 87 if (part_no != 1) { 88 printf("** Partition %d not valid on device %d **\n", 89 part_no, dev_desc->dev); 90 return -1; 91 } 92 93 cur_dev = dev_desc; 94 cur_part_nr = 1; 95 cur_part_info.start = 0; 96 cur_part_info.size = dev_desc->lba; 97 cur_part_info.blksz = dev_desc->blksz; 98 memset(cur_part_info.name, 0, sizeof(cur_part_info.name)); 99 memset(cur_part_info.type, 0, sizeof(cur_part_info.type)); 100 } 101 102 /* Make sure it has a valid FAT header */ 103 if (disk_read(0, 1, buffer) != 1) { 104 cur_dev = NULL; 105 return -1; 106 } 107 108 /* Check if it's actually a DOS volume */ 109 if (memcmp(buffer + DOS_BOOT_MAGIC_OFFSET, "\x55\xAA", 2)) { 110 cur_dev = NULL; 111 return -1; 112 } 113 114 /* Check for FAT12/FAT16/FAT32 filesystem */ 115 if (!memcmp(buffer + DOS_FS_TYPE_OFFSET, "FAT", 3)) 116 return 0; 117 if (!memcmp(buffer + DOS_FS32_TYPE_OFFSET, "FAT32", 5)) 118 return 0; 119 120 cur_dev = NULL; 121 return -1; 122 } 123 124 125 /* 126 * Get the first occurence of a directory delimiter ('/' or '\') in a string. 127 * Return index into string if found, -1 otherwise. 128 */ 129 static int dirdelim (char *str) 130 { 131 char *start = str; 132 133 while (*str != '\0') { 134 if (ISDIRDELIM(*str)) 135 return str - start; 136 str++; 137 } 138 return -1; 139 } 140 141 /* 142 * Extract zero terminated short name from a directory entry. 143 */ 144 static void get_name (dir_entry *dirent, char *s_name) 145 { 146 char *ptr; 147 148 memcpy(s_name, dirent->name, 8); 149 s_name[8] = '\0'; 150 ptr = s_name; 151 while (*ptr && *ptr != ' ') 152 ptr++; 153 if (dirent->ext[0] && dirent->ext[0] != ' ') { 154 *ptr = '.'; 155 ptr++; 156 memcpy(ptr, dirent->ext, 3); 157 ptr[3] = '\0'; 158 while (*ptr && *ptr != ' ') 159 ptr++; 160 } 161 *ptr = '\0'; 162 if (*s_name == DELETED_FLAG) 163 *s_name = '\0'; 164 else if (*s_name == aRING) 165 *s_name = DELETED_FLAG; 166 downcase(s_name); 167 } 168 169 /* 170 * Get the entry at index 'entry' in a FAT (12/16/32) table. 171 * On failure 0x00 is returned. 172 */ 173 static __u32 get_fatent (fsdata *mydata, __u32 entry) 174 { 175 __u32 bufnum; 176 __u32 off16, offset; 177 __u32 ret = 0x00; 178 __u16 val1, val2; 179 180 switch (mydata->fatsize) { 181 case 32: 182 bufnum = entry / FAT32BUFSIZE; 183 offset = entry - bufnum * FAT32BUFSIZE; 184 break; 185 case 16: 186 bufnum = entry / FAT16BUFSIZE; 187 offset = entry - bufnum * FAT16BUFSIZE; 188 break; 189 case 12: 190 bufnum = entry / FAT12BUFSIZE; 191 offset = entry - bufnum * FAT12BUFSIZE; 192 break; 193 194 default: 195 /* Unsupported FAT size */ 196 return ret; 197 } 198 199 debug("FAT%d: entry: 0x%04x = %d, offset: 0x%04x = %d\n", 200 mydata->fatsize, entry, entry, offset, offset); 201 202 /* Read a new block of FAT entries into the cache. */ 203 if (bufnum != mydata->fatbufnum) { 204 __u32 getsize = FATBUFBLOCKS; 205 __u8 *bufptr = mydata->fatbuf; 206 __u32 fatlength = mydata->fatlength; 207 __u32 startblock = bufnum * FATBUFBLOCKS; 208 209 if (getsize > fatlength) 210 getsize = fatlength; 211 212 fatlength *= mydata->sect_size; /* We want it in bytes now */ 213 startblock += mydata->fat_sect; /* Offset from start of disk */ 214 215 if (disk_read(startblock, getsize, bufptr) < 0) { 216 debug("Error reading FAT blocks\n"); 217 return ret; 218 } 219 mydata->fatbufnum = bufnum; 220 } 221 222 /* Get the actual entry from the table */ 223 switch (mydata->fatsize) { 224 case 32: 225 ret = FAT2CPU32(((__u32 *) mydata->fatbuf)[offset]); 226 break; 227 case 16: 228 ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[offset]); 229 break; 230 case 12: 231 off16 = (offset * 3) / 4; 232 233 switch (offset & 0x3) { 234 case 0: 235 ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[off16]); 236 ret &= 0xfff; 237 break; 238 case 1: 239 val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]); 240 val1 &= 0xf000; 241 val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]); 242 val2 &= 0x00ff; 243 ret = (val2 << 4) | (val1 >> 12); 244 break; 245 case 2: 246 val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]); 247 val1 &= 0xff00; 248 val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]); 249 val2 &= 0x000f; 250 ret = (val2 << 8) | (val1 >> 8); 251 break; 252 case 3: 253 ret = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]); 254 ret = (ret & 0xfff0) >> 4; 255 break; 256 default: 257 break; 258 } 259 break; 260 } 261 debug("FAT%d: ret: %08x, offset: %04x\n", 262 mydata->fatsize, ret, offset); 263 264 return ret; 265 } 266 267 /* 268 * Read at most 'size' bytes from the specified cluster into 'buffer'. 269 * Return 0 on success, -1 otherwise. 270 */ 271 static int 272 get_cluster (fsdata *mydata, __u32 clustnum, __u8 *buffer, 273 unsigned long size) 274 { 275 __u32 idx = 0; 276 __u32 startsect; 277 __u32 nr_sect; 278 int ret; 279 280 if (clustnum > 0) { 281 startsect = mydata->data_begin + 282 clustnum * mydata->clust_size; 283 } else { 284 startsect = mydata->rootdir_sect; 285 } 286 287 debug("gc - clustnum: %d, startsect: %d\n", clustnum, startsect); 288 289 nr_sect = size / mydata->sect_size; 290 ret = disk_read(startsect, nr_sect, buffer); 291 if (ret != nr_sect) { 292 debug("Error reading data (got %d)\n", ret); 293 return -1; 294 } 295 if (size % mydata->sect_size) { 296 __u8 tmpbuf[mydata->sect_size]; 297 298 idx = size / mydata->sect_size; 299 ret = disk_read(startsect + idx, 1, tmpbuf); 300 if (ret != 1) { 301 debug("Error reading data (got %d)\n", ret); 302 return -1; 303 } 304 buffer += idx * mydata->sect_size; 305 306 memcpy(buffer, tmpbuf, size % mydata->sect_size); 307 return 0; 308 } 309 310 return 0; 311 } 312 313 /* 314 * Read at most 'maxsize' bytes from the file associated with 'dentptr' 315 * into 'buffer'. 316 * Return the number of bytes read or -1 on fatal errors. 317 */ 318 static long 319 get_contents (fsdata *mydata, dir_entry *dentptr, __u8 *buffer, 320 unsigned long maxsize) 321 { 322 unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0; 323 unsigned int bytesperclust = mydata->clust_size * mydata->sect_size; 324 __u32 curclust = START(dentptr); 325 __u32 endclust, newclust; 326 unsigned long actsize; 327 328 debug("Filesize: %ld bytes\n", filesize); 329 330 if (maxsize > 0 && filesize > maxsize) 331 filesize = maxsize; 332 333 debug("%ld bytes\n", filesize); 334 335 actsize = bytesperclust; 336 endclust = curclust; 337 338 do { 339 /* search for consecutive clusters */ 340 while (actsize < filesize) { 341 newclust = get_fatent(mydata, endclust); 342 if ((newclust - 1) != endclust) 343 goto getit; 344 if (CHECK_CLUST(newclust, mydata->fatsize)) { 345 debug("curclust: 0x%x\n", newclust); 346 debug("Invalid FAT entry\n"); 347 return gotsize; 348 } 349 endclust = newclust; 350 actsize += bytesperclust; 351 } 352 353 /* actsize >= file size */ 354 actsize -= bytesperclust; 355 356 /* get remaining clusters */ 357 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 358 printf("Error reading cluster\n"); 359 return -1; 360 } 361 362 /* get remaining bytes */ 363 gotsize += (int)actsize; 364 filesize -= actsize; 365 buffer += actsize; 366 actsize = filesize; 367 if (get_cluster(mydata, endclust, buffer, (int)actsize) != 0) { 368 printf("Error reading cluster\n"); 369 return -1; 370 } 371 gotsize += actsize; 372 return gotsize; 373 getit: 374 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 375 printf("Error reading cluster\n"); 376 return -1; 377 } 378 gotsize += (int)actsize; 379 filesize -= actsize; 380 buffer += actsize; 381 382 curclust = get_fatent(mydata, endclust); 383 if (CHECK_CLUST(curclust, mydata->fatsize)) { 384 debug("curclust: 0x%x\n", curclust); 385 printf("Invalid FAT entry\n"); 386 return gotsize; 387 } 388 actsize = bytesperclust; 389 endclust = curclust; 390 } while (1); 391 } 392 393 #ifdef CONFIG_SUPPORT_VFAT 394 /* 395 * Extract the file name information from 'slotptr' into 'l_name', 396 * starting at l_name[*idx]. 397 * Return 1 if terminator (zero byte) is found, 0 otherwise. 398 */ 399 static int slot2str (dir_slot *slotptr, char *l_name, int *idx) 400 { 401 int j; 402 403 for (j = 0; j <= 8; j += 2) { 404 l_name[*idx] = slotptr->name0_4[j]; 405 if (l_name[*idx] == 0x00) 406 return 1; 407 (*idx)++; 408 } 409 for (j = 0; j <= 10; j += 2) { 410 l_name[*idx] = slotptr->name5_10[j]; 411 if (l_name[*idx] == 0x00) 412 return 1; 413 (*idx)++; 414 } 415 for (j = 0; j <= 2; j += 2) { 416 l_name[*idx] = slotptr->name11_12[j]; 417 if (l_name[*idx] == 0x00) 418 return 1; 419 (*idx)++; 420 } 421 422 return 0; 423 } 424 425 /* 426 * Extract the full long filename starting at 'retdent' (which is really 427 * a slot) into 'l_name'. If successful also copy the real directory entry 428 * into 'retdent' 429 * Return 0 on success, -1 otherwise. 430 */ 431 __attribute__ ((__aligned__ (__alignof__ (dir_entry)))) 432 __u8 get_vfatname_block[MAX_CLUSTSIZE]; 433 434 static int 435 get_vfatname (fsdata *mydata, int curclust, __u8 *cluster, 436 dir_entry *retdent, char *l_name) 437 { 438 dir_entry *realdent; 439 dir_slot *slotptr = (dir_slot *)retdent; 440 __u8 *buflimit = cluster + mydata->sect_size * ((curclust == 0) ? 441 PREFETCH_BLOCKS : 442 mydata->clust_size); 443 __u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff; 444 int idx = 0; 445 446 if (counter > VFAT_MAXSEQ) { 447 debug("Error: VFAT name is too long\n"); 448 return -1; 449 } 450 451 while ((__u8 *)slotptr < buflimit) { 452 if (counter == 0) 453 break; 454 if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter) 455 return -1; 456 slotptr++; 457 counter--; 458 } 459 460 if ((__u8 *)slotptr >= buflimit) { 461 dir_slot *slotptr2; 462 463 if (curclust == 0) 464 return -1; 465 curclust = get_fatent(mydata, curclust); 466 if (CHECK_CLUST(curclust, mydata->fatsize)) { 467 debug("curclust: 0x%x\n", curclust); 468 printf("Invalid FAT entry\n"); 469 return -1; 470 } 471 472 if (get_cluster(mydata, curclust, get_vfatname_block, 473 mydata->clust_size * mydata->sect_size) != 0) { 474 debug("Error: reading directory block\n"); 475 return -1; 476 } 477 478 slotptr2 = (dir_slot *)get_vfatname_block; 479 while (counter > 0) { 480 if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK) 481 & 0xff) != counter) 482 return -1; 483 slotptr2++; 484 counter--; 485 } 486 487 /* Save the real directory entry */ 488 realdent = (dir_entry *)slotptr2; 489 while ((__u8 *)slotptr2 > get_vfatname_block) { 490 slotptr2--; 491 slot2str(slotptr2, l_name, &idx); 492 } 493 } else { 494 /* Save the real directory entry */ 495 realdent = (dir_entry *)slotptr; 496 } 497 498 do { 499 slotptr--; 500 if (slot2str(slotptr, l_name, &idx)) 501 break; 502 } while (!(slotptr->id & LAST_LONG_ENTRY_MASK)); 503 504 l_name[idx] = '\0'; 505 if (*l_name == DELETED_FLAG) 506 *l_name = '\0'; 507 else if (*l_name == aRING) 508 *l_name = DELETED_FLAG; 509 downcase(l_name); 510 511 /* Return the real directory entry */ 512 memcpy(retdent, realdent, sizeof(dir_entry)); 513 514 return 0; 515 } 516 517 /* Calculate short name checksum */ 518 static __u8 mkcksum (const char *str) 519 { 520 int i; 521 522 __u8 ret = 0; 523 524 for (i = 0; i < 11; i++) { 525 ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + str[i]; 526 } 527 528 return ret; 529 } 530 #endif /* CONFIG_SUPPORT_VFAT */ 531 532 /* 533 * Get the directory entry associated with 'filename' from the directory 534 * starting at 'startsect' 535 */ 536 __attribute__ ((__aligned__ (__alignof__ (dir_entry)))) 537 __u8 get_dentfromdir_block[MAX_CLUSTSIZE]; 538 539 static dir_entry *get_dentfromdir (fsdata *mydata, int startsect, 540 char *filename, dir_entry *retdent, 541 int dols) 542 { 543 __u16 prevcksum = 0xffff; 544 __u32 curclust = START(retdent); 545 int files = 0, dirs = 0; 546 547 debug("get_dentfromdir: %s\n", filename); 548 549 while (1) { 550 dir_entry *dentptr; 551 552 int i; 553 554 if (get_cluster(mydata, curclust, get_dentfromdir_block, 555 mydata->clust_size * mydata->sect_size) != 0) { 556 debug("Error: reading directory block\n"); 557 return NULL; 558 } 559 560 dentptr = (dir_entry *)get_dentfromdir_block; 561 562 for (i = 0; i < DIRENTSPERCLUST; i++) { 563 char s_name[14], l_name[VFAT_MAXLEN_BYTES]; 564 565 l_name[0] = '\0'; 566 if (dentptr->name[0] == DELETED_FLAG) { 567 dentptr++; 568 continue; 569 } 570 if ((dentptr->attr & ATTR_VOLUME)) { 571 #ifdef CONFIG_SUPPORT_VFAT 572 if ((dentptr->attr & ATTR_VFAT) == ATTR_VFAT && 573 (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) { 574 prevcksum = ((dir_slot *)dentptr)->alias_checksum; 575 get_vfatname(mydata, curclust, 576 get_dentfromdir_block, 577 dentptr, l_name); 578 if (dols) { 579 int isdir; 580 char dirc; 581 int doit = 0; 582 583 isdir = (dentptr->attr & ATTR_DIR); 584 585 if (isdir) { 586 dirs++; 587 dirc = '/'; 588 doit = 1; 589 } else { 590 dirc = ' '; 591 if (l_name[0] != 0) { 592 files++; 593 doit = 1; 594 } 595 } 596 if (doit) { 597 if (dirc == ' ') { 598 printf(" %8ld %s%c\n", 599 (long)FAT2CPU32(dentptr->size), 600 l_name, 601 dirc); 602 } else { 603 printf(" %s%c\n", 604 l_name, 605 dirc); 606 } 607 } 608 dentptr++; 609 continue; 610 } 611 debug("vfatname: |%s|\n", l_name); 612 } else 613 #endif 614 { 615 /* Volume label or VFAT entry */ 616 dentptr++; 617 continue; 618 } 619 } 620 if (dentptr->name[0] == 0) { 621 if (dols) { 622 printf("\n%d file(s), %d dir(s)\n\n", 623 files, dirs); 624 } 625 debug("Dentname == NULL - %d\n", i); 626 return NULL; 627 } 628 #ifdef CONFIG_SUPPORT_VFAT 629 if (dols && mkcksum(dentptr->name) == prevcksum) { 630 prevcksum = 0xffff; 631 dentptr++; 632 continue; 633 } 634 #endif 635 get_name(dentptr, s_name); 636 if (dols) { 637 int isdir = (dentptr->attr & ATTR_DIR); 638 char dirc; 639 int doit = 0; 640 641 if (isdir) { 642 dirs++; 643 dirc = '/'; 644 doit = 1; 645 } else { 646 dirc = ' '; 647 if (s_name[0] != 0) { 648 files++; 649 doit = 1; 650 } 651 } 652 653 if (doit) { 654 if (dirc == ' ') { 655 printf(" %8ld %s%c\n", 656 (long)FAT2CPU32(dentptr->size), 657 s_name, dirc); 658 } else { 659 printf(" %s%c\n", 660 s_name, dirc); 661 } 662 } 663 664 dentptr++; 665 continue; 666 } 667 668 if (strcmp(filename, s_name) 669 && strcmp(filename, l_name)) { 670 debug("Mismatch: |%s|%s|\n", s_name, l_name); 671 dentptr++; 672 continue; 673 } 674 675 memcpy(retdent, dentptr, sizeof(dir_entry)); 676 677 debug("DentName: %s", s_name); 678 debug(", start: 0x%x", START(dentptr)); 679 debug(", size: 0x%x %s\n", 680 FAT2CPU32(dentptr->size), 681 (dentptr->attr & ATTR_DIR) ? "(DIR)" : ""); 682 683 return retdent; 684 } 685 686 curclust = get_fatent(mydata, curclust); 687 if (CHECK_CLUST(curclust, mydata->fatsize)) { 688 debug("curclust: 0x%x\n", curclust); 689 printf("Invalid FAT entry\n"); 690 return NULL; 691 } 692 } 693 694 return NULL; 695 } 696 697 /* 698 * Read boot sector and volume info from a FAT filesystem 699 */ 700 static int 701 read_bootsectandvi (boot_sector *bs, volume_info *volinfo, int *fatsize) 702 { 703 __u8 *block; 704 volume_info *vistart; 705 int ret = 0; 706 707 if (cur_dev == NULL) { 708 debug("Error: no device selected\n"); 709 return -1; 710 } 711 712 block = malloc(cur_dev->blksz); 713 if (block == NULL) { 714 debug("Error: allocating block\n"); 715 return -1; 716 } 717 718 if (disk_read (0, 1, block) < 0) { 719 debug("Error: reading block\n"); 720 goto fail; 721 } 722 723 memcpy(bs, block, sizeof(boot_sector)); 724 bs->reserved = FAT2CPU16(bs->reserved); 725 bs->fat_length = FAT2CPU16(bs->fat_length); 726 bs->secs_track = FAT2CPU16(bs->secs_track); 727 bs->heads = FAT2CPU16(bs->heads); 728 bs->total_sect = FAT2CPU32(bs->total_sect); 729 730 /* FAT32 entries */ 731 if (bs->fat_length == 0) { 732 /* Assume FAT32 */ 733 bs->fat32_length = FAT2CPU32(bs->fat32_length); 734 bs->flags = FAT2CPU16(bs->flags); 735 bs->root_cluster = FAT2CPU32(bs->root_cluster); 736 bs->info_sector = FAT2CPU16(bs->info_sector); 737 bs->backup_boot = FAT2CPU16(bs->backup_boot); 738 vistart = (volume_info *)(block + sizeof(boot_sector)); 739 *fatsize = 32; 740 } else { 741 vistart = (volume_info *)&(bs->fat32_length); 742 *fatsize = 0; 743 } 744 memcpy(volinfo, vistart, sizeof(volume_info)); 745 746 if (*fatsize == 32) { 747 if (strncmp(FAT32_SIGN, vistart->fs_type, SIGNLEN) == 0) 748 goto exit; 749 } else { 750 if (strncmp(FAT12_SIGN, vistart->fs_type, SIGNLEN) == 0) { 751 *fatsize = 12; 752 goto exit; 753 } 754 if (strncmp(FAT16_SIGN, vistart->fs_type, SIGNLEN) == 0) { 755 *fatsize = 16; 756 goto exit; 757 } 758 } 759 760 debug("Error: broken fs_type sign\n"); 761 fail: 762 ret = -1; 763 exit: 764 free(block); 765 return ret; 766 } 767 768 __attribute__ ((__aligned__ (__alignof__ (dir_entry)))) 769 __u8 do_fat_read_block[MAX_CLUSTSIZE]; 770 771 long 772 do_fat_read (const char *filename, void *buffer, unsigned long maxsize, 773 int dols) 774 { 775 char fnamecopy[2048]; 776 boot_sector bs; 777 volume_info volinfo; 778 fsdata datablock; 779 fsdata *mydata = &datablock; 780 dir_entry *dentptr; 781 __u16 prevcksum = 0xffff; 782 char *subname = ""; 783 __u32 cursect; 784 int idx, isdir = 0; 785 int files = 0, dirs = 0; 786 long ret = -1; 787 int firsttime; 788 __u32 root_cluster = 0; 789 int rootdir_size = 0; 790 int j; 791 792 if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) { 793 debug("Error: reading boot sector\n"); 794 return -1; 795 } 796 797 if (mydata->fatsize == 32) { 798 root_cluster = bs.root_cluster; 799 mydata->fatlength = bs.fat32_length; 800 } else { 801 mydata->fatlength = bs.fat_length; 802 } 803 804 mydata->fat_sect = bs.reserved; 805 806 cursect = mydata->rootdir_sect 807 = mydata->fat_sect + mydata->fatlength * bs.fats; 808 809 mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0]; 810 mydata->clust_size = bs.cluster_size; 811 if (mydata->sect_size != cur_part_info.blksz) { 812 printf("Error: FAT sector size mismatch (fs=%hu, dev=%lu)\n", 813 mydata->sect_size, cur_part_info.blksz); 814 return -1; 815 } 816 817 if (mydata->fatsize == 32) { 818 mydata->data_begin = mydata->rootdir_sect - 819 (mydata->clust_size * 2); 820 } else { 821 rootdir_size = ((bs.dir_entries[1] * (int)256 + 822 bs.dir_entries[0]) * 823 sizeof(dir_entry)) / 824 mydata->sect_size; 825 mydata->data_begin = mydata->rootdir_sect + 826 rootdir_size - 827 (mydata->clust_size * 2); 828 } 829 830 mydata->fatbufnum = -1; 831 mydata->fatbuf = malloc(FATBUFSIZE); 832 if (mydata->fatbuf == NULL) { 833 debug("Error: allocating memory\n"); 834 return -1; 835 } 836 837 #ifdef CONFIG_SUPPORT_VFAT 838 debug("VFAT Support enabled\n"); 839 #endif 840 debug("FAT%d, fat_sect: %d, fatlength: %d\n", 841 mydata->fatsize, mydata->fat_sect, mydata->fatlength); 842 debug("Rootdir begins at cluster: %d, sector: %d, offset: %x\n" 843 "Data begins at: %d\n", 844 root_cluster, 845 mydata->rootdir_sect, 846 mydata->rootdir_sect * mydata->sect_size, mydata->data_begin); 847 debug("Sector size: %d, cluster size: %d\n", mydata->sect_size, 848 mydata->clust_size); 849 850 /* "cwd" is always the root... */ 851 while (ISDIRDELIM(*filename)) 852 filename++; 853 854 /* Make a copy of the filename and convert it to lowercase */ 855 strcpy(fnamecopy, filename); 856 downcase(fnamecopy); 857 858 if (*fnamecopy == '\0') { 859 if (!dols) 860 goto exit; 861 862 dols = LS_ROOT; 863 } else if ((idx = dirdelim(fnamecopy)) >= 0) { 864 isdir = 1; 865 fnamecopy[idx] = '\0'; 866 subname = fnamecopy + idx + 1; 867 868 /* Handle multiple delimiters */ 869 while (ISDIRDELIM(*subname)) 870 subname++; 871 } else if (dols) { 872 isdir = 1; 873 } 874 875 j = 0; 876 while (1) { 877 int i; 878 879 debug("FAT read sect=%d, clust_size=%d, DIRENTSPERBLOCK=%zd\n", 880 cursect, mydata->clust_size, DIRENTSPERBLOCK); 881 882 if (disk_read(cursect, 883 (mydata->fatsize == 32) ? 884 (mydata->clust_size) : 885 PREFETCH_BLOCKS, 886 do_fat_read_block) < 0) { 887 debug("Error: reading rootdir block\n"); 888 goto exit; 889 } 890 891 dentptr = (dir_entry *) do_fat_read_block; 892 893 for (i = 0; i < DIRENTSPERBLOCK; i++) { 894 char s_name[14], l_name[VFAT_MAXLEN_BYTES]; 895 896 l_name[0] = '\0'; 897 if (dentptr->name[0] == DELETED_FLAG) { 898 dentptr++; 899 continue; 900 } 901 if ((dentptr->attr & ATTR_VOLUME)) { 902 #ifdef CONFIG_SUPPORT_VFAT 903 if ((dentptr->attr & ATTR_VFAT) == ATTR_VFAT && 904 (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) { 905 prevcksum = 906 ((dir_slot *)dentptr)->alias_checksum; 907 908 get_vfatname(mydata, 909 root_cluster, 910 do_fat_read_block, 911 dentptr, l_name); 912 913 if (dols == LS_ROOT) { 914 char dirc; 915 int doit = 0; 916 int isdir = 917 (dentptr->attr & ATTR_DIR); 918 919 if (isdir) { 920 dirs++; 921 dirc = '/'; 922 doit = 1; 923 } else { 924 dirc = ' '; 925 if (l_name[0] != 0) { 926 files++; 927 doit = 1; 928 } 929 } 930 if (doit) { 931 if (dirc == ' ') { 932 printf(" %8ld %s%c\n", 933 (long)FAT2CPU32(dentptr->size), 934 l_name, 935 dirc); 936 } else { 937 printf(" %s%c\n", 938 l_name, 939 dirc); 940 } 941 } 942 dentptr++; 943 continue; 944 } 945 debug("Rootvfatname: |%s|\n", 946 l_name); 947 } else 948 #endif 949 { 950 /* Volume label or VFAT entry */ 951 dentptr++; 952 continue; 953 } 954 } else if (dentptr->name[0] == 0) { 955 debug("RootDentname == NULL - %d\n", i); 956 if (dols == LS_ROOT) { 957 printf("\n%d file(s), %d dir(s)\n\n", 958 files, dirs); 959 ret = 0; 960 } 961 goto exit; 962 } 963 #ifdef CONFIG_SUPPORT_VFAT 964 else if (dols == LS_ROOT && 965 mkcksum(dentptr->name) == prevcksum) { 966 prevcksum = 0xffff; 967 dentptr++; 968 continue; 969 } 970 #endif 971 get_name(dentptr, s_name); 972 973 if (dols == LS_ROOT) { 974 int isdir = (dentptr->attr & ATTR_DIR); 975 char dirc; 976 int doit = 0; 977 978 if (isdir) { 979 dirc = '/'; 980 if (s_name[0] != 0) { 981 dirs++; 982 doit = 1; 983 } 984 } else { 985 dirc = ' '; 986 if (s_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 s_name, dirc); 996 } else { 997 printf(" %s%c\n", 998 s_name, dirc); 999 } 1000 } 1001 dentptr++; 1002 continue; 1003 } 1004 1005 if (strcmp(fnamecopy, s_name) 1006 && strcmp(fnamecopy, l_name)) { 1007 debug("RootMismatch: |%s|%s|\n", s_name, 1008 l_name); 1009 dentptr++; 1010 continue; 1011 } 1012 1013 if (isdir && !(dentptr->attr & ATTR_DIR)) 1014 goto exit; 1015 1016 debug("RootName: %s", s_name); 1017 debug(", start: 0x%x", START(dentptr)); 1018 debug(", size: 0x%x %s\n", 1019 FAT2CPU32(dentptr->size), 1020 isdir ? "(DIR)" : ""); 1021 1022 goto rootdir_done; /* We got a match */ 1023 } 1024 debug("END LOOP: j=%d clust_size=%d\n", j, 1025 mydata->clust_size); 1026 1027 /* 1028 * On FAT32 we must fetch the FAT entries for the next 1029 * root directory clusters when a cluster has been 1030 * completely processed. 1031 */ 1032 ++j; 1033 int fat32_end = 0; 1034 if ((mydata->fatsize == 32) && (j == mydata->clust_size)) { 1035 int nxtsect = 0; 1036 int nxt_clust = 0; 1037 1038 nxt_clust = get_fatent(mydata, root_cluster); 1039 fat32_end = CHECK_CLUST(nxt_clust, 32); 1040 1041 nxtsect = mydata->data_begin + 1042 (nxt_clust * mydata->clust_size); 1043 1044 root_cluster = nxt_clust; 1045 1046 cursect = nxtsect; 1047 j = 0; 1048 } else { 1049 cursect++; 1050 } 1051 1052 /* If end of rootdir reached */ 1053 if ((mydata->fatsize == 32 && fat32_end) || 1054 (mydata->fatsize != 32 && j == rootdir_size)) { 1055 if (dols == LS_ROOT) { 1056 printf("\n%d file(s), %d dir(s)\n\n", 1057 files, dirs); 1058 ret = 0; 1059 } 1060 goto exit; 1061 } 1062 } 1063 rootdir_done: 1064 1065 firsttime = 1; 1066 1067 while (isdir) { 1068 int startsect = mydata->data_begin 1069 + START(dentptr) * mydata->clust_size; 1070 dir_entry dent; 1071 char *nextname = NULL; 1072 1073 dent = *dentptr; 1074 dentptr = &dent; 1075 1076 idx = dirdelim(subname); 1077 1078 if (idx >= 0) { 1079 subname[idx] = '\0'; 1080 nextname = subname + idx + 1; 1081 /* Handle multiple delimiters */ 1082 while (ISDIRDELIM(*nextname)) 1083 nextname++; 1084 if (dols && *nextname == '\0') 1085 firsttime = 0; 1086 } else { 1087 if (dols && firsttime) { 1088 firsttime = 0; 1089 } else { 1090 isdir = 0; 1091 } 1092 } 1093 1094 if (get_dentfromdir(mydata, startsect, subname, dentptr, 1095 isdir ? 0 : dols) == NULL) { 1096 if (dols && !isdir) 1097 ret = 0; 1098 goto exit; 1099 } 1100 1101 if (idx >= 0) { 1102 if (!(dentptr->attr & ATTR_DIR)) 1103 goto exit; 1104 subname = nextname; 1105 } 1106 } 1107 1108 ret = get_contents(mydata, dentptr, buffer, maxsize); 1109 debug("Size: %d, got: %ld\n", FAT2CPU32(dentptr->size), ret); 1110 1111 exit: 1112 free(mydata->fatbuf); 1113 return ret; 1114 } 1115 1116 int file_fat_detectfs (void) 1117 { 1118 boot_sector bs; 1119 volume_info volinfo; 1120 int fatsize; 1121 char vol_label[12]; 1122 1123 if (cur_dev == NULL) { 1124 printf("No current device\n"); 1125 return 1; 1126 } 1127 1128 #if defined(CONFIG_CMD_IDE) || \ 1129 defined(CONFIG_CMD_MG_DISK) || \ 1130 defined(CONFIG_CMD_SATA) || \ 1131 defined(CONFIG_CMD_SCSI) || \ 1132 defined(CONFIG_CMD_USB) || \ 1133 defined(CONFIG_MMC) 1134 printf("Interface: "); 1135 switch (cur_dev->if_type) { 1136 case IF_TYPE_IDE: 1137 printf("IDE"); 1138 break; 1139 case IF_TYPE_SATA: 1140 printf("SATA"); 1141 break; 1142 case IF_TYPE_SCSI: 1143 printf("SCSI"); 1144 break; 1145 case IF_TYPE_ATAPI: 1146 printf("ATAPI"); 1147 break; 1148 case IF_TYPE_USB: 1149 printf("USB"); 1150 break; 1151 case IF_TYPE_DOC: 1152 printf("DOC"); 1153 break; 1154 case IF_TYPE_MMC: 1155 printf("MMC"); 1156 break; 1157 default: 1158 printf("Unknown"); 1159 } 1160 1161 printf("\n Device %d: ", cur_dev->dev); 1162 dev_print(cur_dev); 1163 #endif 1164 1165 if (read_bootsectandvi(&bs, &volinfo, &fatsize)) { 1166 printf("\nNo valid FAT fs found\n"); 1167 return 1; 1168 } 1169 1170 memcpy(vol_label, volinfo.volume_label, 11); 1171 vol_label[11] = '\0'; 1172 volinfo.fs_type[5] = '\0'; 1173 1174 printf("Partition %d: Filesystem: %s \"%s\"\n", cur_part_nr, 1175 volinfo.fs_type, vol_label); 1176 1177 return 0; 1178 } 1179 1180 int file_fat_ls (const char *dir) 1181 { 1182 return do_fat_read(dir, NULL, 0, LS_YES); 1183 } 1184 1185 long file_fat_read (const char *filename, void *buffer, unsigned long maxsize) 1186 { 1187 printf("reading %s\n", filename); 1188 return do_fat_read(filename, buffer, maxsize, LS_NO); 1189 } 1190