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 <fat.h> 31 #include <asm/byteorder.h> 32 #include <part.h> 33 34 /* 35 * Convert a string to lowercase. 36 */ 37 static void downcase (char *str) 38 { 39 while (*str != '\0') { 40 TOLOWER(*str); 41 str++; 42 } 43 } 44 45 static block_dev_desc_t *cur_dev = NULL; 46 47 static unsigned long part_offset = 0; 48 49 static int cur_part = 1; 50 51 #define DOS_PART_TBL_OFFSET 0x1be 52 #define DOS_PART_MAGIC_OFFSET 0x1fe 53 #define DOS_FS_TYPE_OFFSET 0x36 54 #define DOS_FS32_TYPE_OFFSET 0x52 55 56 static int disk_read (__u32 startblock, __u32 getsize, __u8 * bufptr) 57 { 58 if (cur_dev == NULL) 59 return -1; 60 61 startblock += part_offset; 62 63 if (cur_dev->block_read) { 64 return cur_dev->block_read(cur_dev->dev, startblock, getsize, 65 (unsigned long *) bufptr); 66 } 67 return -1; 68 } 69 70 int fat_register_device (block_dev_desc_t * dev_desc, int part_no) 71 { 72 unsigned char buffer[SECTOR_SIZE]; 73 74 disk_partition_t info; 75 76 if (!dev_desc->block_read) 77 return -1; 78 79 cur_dev = dev_desc; 80 /* check if we have a MBR (on floppies we have only a PBR) */ 81 if (dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *)buffer) != 1) { 82 printf("** Can't read from device %d **\n", 83 dev_desc->dev); 84 return -1; 85 } 86 if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 || 87 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) { 88 /* no signature found */ 89 return -1; 90 } 91 #if (defined(CONFIG_CMD_IDE) || \ 92 defined(CONFIG_CMD_MG_DISK) || \ 93 defined(CONFIG_CMD_SATA) || \ 94 defined(CONFIG_CMD_SCSI) || \ 95 defined(CONFIG_CMD_USB) || \ 96 defined(CONFIG_MMC) || \ 97 defined(CONFIG_SYSTEMACE) ) 98 /* First we assume there is a MBR */ 99 if (!get_partition_info(dev_desc, part_no, &info)) { 100 part_offset = info.start; 101 cur_part = part_no; 102 } else if ((strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET], "FAT", 3) == 0) || 103 (strncmp((char *)&buffer[DOS_FS32_TYPE_OFFSET], "FAT32", 5) == 0)) { 104 /* ok, we assume we are on a PBR only */ 105 cur_part = 1; 106 part_offset = 0; 107 } else { 108 printf("** Partition %d not valid on device %d **\n", 109 part_no, dev_desc->dev); 110 return -1; 111 } 112 113 #else 114 if ((strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET], "FAT", 3) == 0) || 115 (strncmp((char *)&buffer[DOS_FS32_TYPE_OFFSET], "FAT32", 5) == 0)) { 116 /* ok, we assume we are on a PBR only */ 117 cur_part = 1; 118 part_offset = 0; 119 info.start = part_offset; 120 } else { 121 /* FIXME we need to determine the start block of the 122 * partition where the DOS FS resides. This can be done 123 * by using the get_partition_info routine. For this 124 * purpose the libpart must be included. 125 */ 126 part_offset = 32; 127 cur_part = 1; 128 } 129 #endif 130 return 0; 131 } 132 133 /* 134 * Get the first occurence of a directory delimiter ('/' or '\') in a string. 135 * Return index into string if found, -1 otherwise. 136 */ 137 static int dirdelim (char *str) 138 { 139 char *start = str; 140 141 while (*str != '\0') { 142 if (ISDIRDELIM(*str)) 143 return str - start; 144 str++; 145 } 146 return -1; 147 } 148 149 /* 150 * Extract zero terminated short name from a directory entry. 151 */ 152 static void get_name (dir_entry *dirent, char *s_name) 153 { 154 char *ptr; 155 156 memcpy(s_name, dirent->name, 8); 157 s_name[8] = '\0'; 158 ptr = s_name; 159 while (*ptr && *ptr != ' ') 160 ptr++; 161 if (dirent->ext[0] && dirent->ext[0] != ' ') { 162 *ptr = '.'; 163 ptr++; 164 memcpy(ptr, dirent->ext, 3); 165 ptr[3] = '\0'; 166 while (*ptr && *ptr != ' ') 167 ptr++; 168 } 169 *ptr = '\0'; 170 if (*s_name == DELETED_FLAG) 171 *s_name = '\0'; 172 else if (*s_name == aRING) 173 *s_name = DELETED_FLAG; 174 downcase(s_name); 175 } 176 177 /* 178 * Get the entry at index 'entry' in a FAT (12/16/32) table. 179 * On failure 0x00 is returned. 180 */ 181 static __u32 get_fatent (fsdata *mydata, __u32 entry) 182 { 183 __u32 bufnum; 184 __u32 off16, offset; 185 __u32 ret = 0x00; 186 __u16 val1, val2; 187 188 switch (mydata->fatsize) { 189 case 32: 190 bufnum = entry / FAT32BUFSIZE; 191 offset = entry - bufnum * FAT32BUFSIZE; 192 break; 193 case 16: 194 bufnum = entry / FAT16BUFSIZE; 195 offset = entry - bufnum * FAT16BUFSIZE; 196 break; 197 case 12: 198 bufnum = entry / FAT12BUFSIZE; 199 offset = entry - bufnum * FAT12BUFSIZE; 200 break; 201 202 default: 203 /* Unsupported FAT size */ 204 return ret; 205 } 206 207 debug("FAT%d: entry: 0x%04x = %d, offset: 0x%04x = %d\n", 208 mydata->fatsize, entry, entry, offset, offset); 209 210 /* Read a new block of FAT entries into the cache. */ 211 if (bufnum != mydata->fatbufnum) { 212 __u32 getsize = FATBUFSIZE / FS_BLOCK_SIZE; 213 __u8 *bufptr = mydata->fatbuf; 214 __u32 fatlength = mydata->fatlength; 215 __u32 startblock = bufnum * FATBUFBLOCKS; 216 217 fatlength *= SECTOR_SIZE; /* We want it in bytes now */ 218 startblock += mydata->fat_sect; /* Offset from start of disk */ 219 220 if (getsize > fatlength) 221 getsize = fatlength; 222 if (disk_read(startblock, getsize, bufptr) < 0) { 223 debug("Error reading FAT blocks\n"); 224 return ret; 225 } 226 mydata->fatbufnum = bufnum; 227 } 228 229 /* Get the actual entry from the table */ 230 switch (mydata->fatsize) { 231 case 32: 232 ret = FAT2CPU32(((__u32 *) mydata->fatbuf)[offset]); 233 break; 234 case 16: 235 ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[offset]); 236 break; 237 case 12: 238 off16 = (offset * 3) / 4; 239 240 switch (offset & 0x3) { 241 case 0: 242 ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[off16]); 243 ret &= 0xfff; 244 break; 245 case 1: 246 val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]); 247 val1 &= 0xf000; 248 val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]); 249 val2 &= 0x00ff; 250 ret = (val2 << 4) | (val1 >> 12); 251 break; 252 case 2: 253 val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]); 254 val1 &= 0xff00; 255 val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]); 256 val2 &= 0x000f; 257 ret = (val2 << 8) | (val1 >> 8); 258 break; 259 case 3: 260 ret = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]); 261 ret = (ret & 0xfff0) >> 4; 262 break; 263 default: 264 break; 265 } 266 break; 267 } 268 debug("FAT%d: ret: %08x, offset: %04x\n", 269 mydata->fatsize, ret, offset); 270 271 return ret; 272 } 273 274 /* 275 * Read at most 'size' bytes from the specified cluster into 'buffer'. 276 * Return 0 on success, -1 otherwise. 277 */ 278 static int 279 get_cluster (fsdata *mydata, __u32 clustnum, __u8 *buffer, 280 unsigned long size) 281 { 282 __u32 idx = 0; 283 __u32 startsect; 284 285 if (clustnum > 0) { 286 startsect = mydata->data_begin + 287 clustnum * mydata->clust_size; 288 } else { 289 startsect = mydata->rootdir_sect; 290 } 291 292 debug("gc - clustnum: %d, startsect: %d\n", clustnum, startsect); 293 294 if (disk_read(startsect, size / FS_BLOCK_SIZE, buffer) < 0) { 295 debug("Error reading data\n"); 296 return -1; 297 } 298 if (size % FS_BLOCK_SIZE) { 299 __u8 tmpbuf[FS_BLOCK_SIZE]; 300 301 idx = size / FS_BLOCK_SIZE; 302 if (disk_read(startsect + idx, 1, tmpbuf) < 0) { 303 debug("Error reading data\n"); 304 return -1; 305 } 306 buffer += idx * FS_BLOCK_SIZE; 307 308 memcpy(buffer, tmpbuf, size % FS_BLOCK_SIZE); 309 return 0; 310 } 311 312 return 0; 313 } 314 315 /* 316 * Read at most 'maxsize' bytes from the file associated with 'dentptr' 317 * into 'buffer'. 318 * Return the number of bytes read or -1 on fatal errors. 319 */ 320 static long 321 get_contents (fsdata *mydata, dir_entry *dentptr, __u8 *buffer, 322 unsigned long maxsize) 323 { 324 unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0; 325 unsigned int bytesperclust = mydata->clust_size * SECTOR_SIZE; 326 __u32 curclust = START(dentptr); 327 __u32 endclust, newclust; 328 unsigned long actsize; 329 330 debug("Filesize: %ld bytes\n", filesize); 331 332 if (maxsize > 0 && filesize > maxsize) 333 filesize = maxsize; 334 335 debug("%ld bytes\n", filesize); 336 337 actsize = bytesperclust; 338 endclust = curclust; 339 340 do { 341 /* search for consecutive clusters */ 342 while (actsize < filesize) { 343 newclust = get_fatent(mydata, endclust); 344 if ((newclust - 1) != endclust) 345 goto getit; 346 if (CHECK_CLUST(newclust, mydata->fatsize)) { 347 debug("curclust: 0x%x\n", newclust); 348 debug("Invalid FAT entry\n"); 349 return gotsize; 350 } 351 endclust = newclust; 352 actsize += bytesperclust; 353 } 354 355 /* actsize >= file size */ 356 actsize -= bytesperclust; 357 358 /* get remaining clusters */ 359 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 360 printf("Error reading cluster\n"); 361 return -1; 362 } 363 364 /* get remaining bytes */ 365 gotsize += (int)actsize; 366 filesize -= actsize; 367 buffer += actsize; 368 actsize = filesize; 369 if (get_cluster(mydata, endclust, buffer, (int)actsize) != 0) { 370 printf("Error reading cluster\n"); 371 return -1; 372 } 373 gotsize += actsize; 374 return gotsize; 375 getit: 376 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 377 printf("Error reading cluster\n"); 378 return -1; 379 } 380 gotsize += (int)actsize; 381 filesize -= actsize; 382 buffer += actsize; 383 384 curclust = get_fatent(mydata, endclust); 385 if (CHECK_CLUST(curclust, mydata->fatsize)) { 386 debug("curclust: 0x%x\n", curclust); 387 printf("Invalid FAT entry\n"); 388 return gotsize; 389 } 390 actsize = bytesperclust; 391 endclust = curclust; 392 } while (1); 393 } 394 395 #ifdef CONFIG_SUPPORT_VFAT 396 /* 397 * Extract the file name information from 'slotptr' into 'l_name', 398 * starting at l_name[*idx]. 399 * Return 1 if terminator (zero byte) is found, 0 otherwise. 400 */ 401 static int slot2str (dir_slot *slotptr, char *l_name, int *idx) 402 { 403 int j; 404 405 for (j = 0; j <= 8; j += 2) { 406 l_name[*idx] = slotptr->name0_4[j]; 407 if (l_name[*idx] == 0x00) 408 return 1; 409 (*idx)++; 410 } 411 for (j = 0; j <= 10; j += 2) { 412 l_name[*idx] = slotptr->name5_10[j]; 413 if (l_name[*idx] == 0x00) 414 return 1; 415 (*idx)++; 416 } 417 for (j = 0; j <= 2; j += 2) { 418 l_name[*idx] = slotptr->name11_12[j]; 419 if (l_name[*idx] == 0x00) 420 return 1; 421 (*idx)++; 422 } 423 424 return 0; 425 } 426 427 /* 428 * Extract the full long filename starting at 'retdent' (which is really 429 * a slot) into 'l_name'. If successful also copy the real directory entry 430 * into 'retdent' 431 * Return 0 on success, -1 otherwise. 432 */ 433 __attribute__ ((__aligned__ (__alignof__ (dir_entry)))) 434 __u8 get_vfatname_block[MAX_CLUSTSIZE]; 435 436 static int 437 get_vfatname (fsdata *mydata, int curclust, __u8 *cluster, 438 dir_entry *retdent, char *l_name) 439 { 440 dir_entry *realdent; 441 dir_slot *slotptr = (dir_slot *)retdent; 442 __u8 *buflimit = cluster + ((curclust == 0) ? 443 LINEAR_PREFETCH_SIZE : 444 (mydata->clust_size * SECTOR_SIZE) 445 ); 446 __u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff; 447 int idx = 0; 448 449 if (counter > VFAT_MAXSEQ) { 450 debug("Error: VFAT name is too long\n"); 451 return -1; 452 } 453 454 while ((__u8 *)slotptr < buflimit) { 455 if (counter == 0) 456 break; 457 if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter) 458 return -1; 459 slotptr++; 460 counter--; 461 } 462 463 if ((__u8 *)slotptr >= buflimit) { 464 dir_slot *slotptr2; 465 466 if (curclust == 0) 467 return -1; 468 curclust = get_fatent(mydata, curclust); 469 if (CHECK_CLUST(curclust, mydata->fatsize)) { 470 debug("curclust: 0x%x\n", curclust); 471 printf("Invalid FAT entry\n"); 472 return -1; 473 } 474 475 if (get_cluster(mydata, curclust, get_vfatname_block, 476 mydata->clust_size * SECTOR_SIZE) != 0) { 477 debug("Error: reading directory block\n"); 478 return -1; 479 } 480 481 slotptr2 = (dir_slot *)get_vfatname_block; 482 while (counter > 0) { 483 if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK) 484 & 0xff) != counter) 485 return -1; 486 slotptr2++; 487 counter--; 488 } 489 490 /* Save the real directory entry */ 491 realdent = (dir_entry *)slotptr2; 492 while ((__u8 *)slotptr2 > get_vfatname_block) { 493 slotptr2--; 494 slot2str(slotptr2, l_name, &idx); 495 } 496 } else { 497 /* Save the real directory entry */ 498 realdent = (dir_entry *)slotptr; 499 } 500 501 do { 502 slotptr--; 503 if (slot2str(slotptr, l_name, &idx)) 504 break; 505 } while (!(slotptr->id & LAST_LONG_ENTRY_MASK)); 506 507 l_name[idx] = '\0'; 508 if (*l_name == DELETED_FLAG) 509 *l_name = '\0'; 510 else if (*l_name == aRING) 511 *l_name = DELETED_FLAG; 512 downcase(l_name); 513 514 /* Return the real directory entry */ 515 memcpy(retdent, realdent, sizeof(dir_entry)); 516 517 return 0; 518 } 519 520 /* Calculate short name checksum */ 521 static __u8 mkcksum (const char *str) 522 { 523 int i; 524 525 __u8 ret = 0; 526 527 for (i = 0; i < 11; i++) { 528 ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + str[i]; 529 } 530 531 return ret; 532 } 533 #endif /* CONFIG_SUPPORT_VFAT */ 534 535 /* 536 * Get the directory entry associated with 'filename' from the directory 537 * starting at 'startsect' 538 */ 539 __attribute__ ((__aligned__ (__alignof__ (dir_entry)))) 540 __u8 get_dentfromdir_block[MAX_CLUSTSIZE]; 541 542 static dir_entry *get_dentfromdir (fsdata *mydata, int startsect, 543 char *filename, dir_entry *retdent, 544 int dols) 545 { 546 __u16 prevcksum = 0xffff; 547 __u32 curclust = START(retdent); 548 int files = 0, dirs = 0; 549 550 debug("get_dentfromdir: %s\n", filename); 551 552 while (1) { 553 dir_entry *dentptr; 554 555 int i; 556 557 if (get_cluster(mydata, curclust, get_dentfromdir_block, 558 mydata->clust_size * SECTOR_SIZE) != 0) { 559 debug("Error: reading directory block\n"); 560 return NULL; 561 } 562 563 dentptr = (dir_entry *)get_dentfromdir_block; 564 565 for (i = 0; i < DIRENTSPERCLUST; i++) { 566 char s_name[14], l_name[VFAT_MAXLEN_BYTES]; 567 568 l_name[0] = '\0'; 569 if (dentptr->name[0] == DELETED_FLAG) { 570 dentptr++; 571 continue; 572 } 573 if ((dentptr->attr & ATTR_VOLUME)) { 574 #ifdef CONFIG_SUPPORT_VFAT 575 if ((dentptr->attr & ATTR_VFAT) && 576 (dentptr-> name[0] & LAST_LONG_ENTRY_MASK)) { 577 prevcksum = ((dir_slot *)dentptr)->alias_checksum; 578 get_vfatname(mydata, curclust, 579 get_dentfromdir_block, 580 dentptr, l_name); 581 if (dols) { 582 int isdir; 583 char dirc; 584 int doit = 0; 585 586 isdir = (dentptr->attr & ATTR_DIR); 587 588 if (isdir) { 589 dirs++; 590 dirc = '/'; 591 doit = 1; 592 } else { 593 dirc = ' '; 594 if (l_name[0] != 0) { 595 files++; 596 doit = 1; 597 } 598 } 599 if (doit) { 600 if (dirc == ' ') { 601 printf(" %8ld %s%c\n", 602 (long)FAT2CPU32(dentptr->size), 603 l_name, 604 dirc); 605 } else { 606 printf(" %s%c\n", 607 l_name, 608 dirc); 609 } 610 } 611 dentptr++; 612 continue; 613 } 614 debug("vfatname: |%s|\n", l_name); 615 } else 616 #endif 617 { 618 /* Volume label or VFAT entry */ 619 dentptr++; 620 continue; 621 } 622 } 623 if (dentptr->name[0] == 0) { 624 if (dols) { 625 printf("\n%d file(s), %d dir(s)\n\n", 626 files, dirs); 627 } 628 debug("Dentname == NULL - %d\n", i); 629 return NULL; 630 } 631 #ifdef CONFIG_SUPPORT_VFAT 632 if (dols && mkcksum(dentptr->name) == prevcksum) { 633 dentptr++; 634 continue; 635 } 636 #endif 637 get_name(dentptr, s_name); 638 if (dols) { 639 int isdir = (dentptr->attr & ATTR_DIR); 640 char dirc; 641 int doit = 0; 642 643 if (isdir) { 644 dirs++; 645 dirc = '/'; 646 doit = 1; 647 } else { 648 dirc = ' '; 649 if (s_name[0] != 0) { 650 files++; 651 doit = 1; 652 } 653 } 654 655 if (doit) { 656 if (dirc == ' ') { 657 printf(" %8ld %s%c\n", 658 (long)FAT2CPU32(dentptr->size), 659 s_name, dirc); 660 } else { 661 printf(" %s%c\n", 662 s_name, dirc); 663 } 664 } 665 666 dentptr++; 667 continue; 668 } 669 670 if (strcmp(filename, s_name) 671 && strcmp(filename, l_name)) { 672 debug("Mismatch: |%s|%s|\n", s_name, l_name); 673 dentptr++; 674 continue; 675 } 676 677 memcpy(retdent, dentptr, sizeof(dir_entry)); 678 679 debug("DentName: %s", s_name); 680 debug(", start: 0x%x", START(dentptr)); 681 debug(", size: 0x%x %s\n", 682 FAT2CPU32(dentptr->size), 683 (dentptr->attr & ATTR_DIR) ? "(DIR)" : ""); 684 685 return retdent; 686 } 687 688 curclust = get_fatent(mydata, curclust); 689 if (CHECK_CLUST(curclust, mydata->fatsize)) { 690 debug("curclust: 0x%x\n", curclust); 691 printf("Invalid FAT entry\n"); 692 return NULL; 693 } 694 } 695 696 return NULL; 697 } 698 699 /* 700 * Read boot sector and volume info from a FAT filesystem 701 */ 702 static int 703 read_bootsectandvi (boot_sector *bs, volume_info *volinfo, int *fatsize) 704 { 705 __u8 block[FS_BLOCK_SIZE]; 706 707 volume_info *vistart; 708 709 if (disk_read (0, 1, block) < 0) { 710 debug("Error: reading block\n"); 711 return -1; 712 } 713 714 memcpy(bs, block, sizeof(boot_sector)); 715 bs->reserved = FAT2CPU16(bs->reserved); 716 bs->fat_length = FAT2CPU16(bs->fat_length); 717 bs->secs_track = FAT2CPU16(bs->secs_track); 718 bs->heads = FAT2CPU16(bs->heads); 719 bs->total_sect = FAT2CPU32(bs->total_sect); 720 721 /* FAT32 entries */ 722 if (bs->fat_length == 0) { 723 /* Assume FAT32 */ 724 bs->fat32_length = FAT2CPU32(bs->fat32_length); 725 bs->flags = FAT2CPU16(bs->flags); 726 bs->root_cluster = FAT2CPU32(bs->root_cluster); 727 bs->info_sector = FAT2CPU16(bs->info_sector); 728 bs->backup_boot = FAT2CPU16(bs->backup_boot); 729 vistart = (volume_info *)(block + sizeof(boot_sector)); 730 *fatsize = 32; 731 } else { 732 vistart = (volume_info *)&(bs->fat32_length); 733 *fatsize = 0; 734 } 735 memcpy(volinfo, vistart, sizeof(volume_info)); 736 737 if (*fatsize == 32) { 738 if (strncmp(FAT32_SIGN, vistart->fs_type, SIGNLEN) == 0) 739 return 0; 740 } else { 741 if (strncmp(FAT12_SIGN, vistart->fs_type, SIGNLEN) == 0) { 742 *fatsize = 12; 743 return 0; 744 } 745 if (strncmp(FAT16_SIGN, vistart->fs_type, SIGNLEN) == 0) { 746 *fatsize = 16; 747 return 0; 748 } 749 } 750 751 debug("Error: broken fs_type sign\n"); 752 return -1; 753 } 754 755 __attribute__ ((__aligned__ (__alignof__ (dir_entry)))) 756 __u8 do_fat_read_block[MAX_CLUSTSIZE]; 757 758 long 759 do_fat_read (const char *filename, void *buffer, unsigned long maxsize, 760 int dols) 761 { 762 char fnamecopy[2048]; 763 boot_sector bs; 764 volume_info volinfo; 765 fsdata datablock; 766 fsdata *mydata = &datablock; 767 dir_entry *dentptr; 768 __u16 prevcksum = 0xffff; 769 char *subname = ""; 770 __u32 cursect; 771 int idx, isdir = 0; 772 int files = 0, dirs = 0; 773 long ret = 0; 774 int firsttime; 775 __u32 root_cluster; 776 int rootdir_size = 0; 777 int j; 778 779 if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) { 780 debug("Error: reading boot sector\n"); 781 return -1; 782 } 783 784 root_cluster = bs.root_cluster; 785 786 if (mydata->fatsize == 32) 787 mydata->fatlength = bs.fat32_length; 788 else 789 mydata->fatlength = bs.fat_length; 790 791 mydata->fat_sect = bs.reserved; 792 793 cursect = mydata->rootdir_sect 794 = mydata->fat_sect + mydata->fatlength * bs.fats; 795 796 mydata->clust_size = bs.cluster_size; 797 798 if (mydata->fatsize == 32) { 799 mydata->data_begin = mydata->rootdir_sect - 800 (mydata->clust_size * 2); 801 } else { 802 rootdir_size = ((bs.dir_entries[1] * (int)256 + 803 bs.dir_entries[0]) * 804 sizeof(dir_entry)) / 805 SECTOR_SIZE; 806 mydata->data_begin = mydata->rootdir_sect + 807 rootdir_size - 808 (mydata->clust_size * 2); 809 } 810 811 mydata->fatbufnum = -1; 812 813 #ifdef CONFIG_SUPPORT_VFAT 814 debug("VFAT Support enabled\n"); 815 #endif 816 debug("FAT%d, fat_sect: %d, fatlength: %d\n", 817 mydata->fatsize, mydata->fat_sect, mydata->fatlength); 818 debug("Rootdir begins at cluster: %d, sector: %d, offset: %x\n" 819 "Data begins at: %d\n", 820 root_cluster, 821 mydata->rootdir_sect, 822 mydata->rootdir_sect * SECTOR_SIZE, mydata->data_begin); 823 debug("Cluster size: %d\n", mydata->clust_size); 824 825 /* "cwd" is always the root... */ 826 while (ISDIRDELIM(*filename)) 827 filename++; 828 829 /* Make a copy of the filename and convert it to lowercase */ 830 strcpy(fnamecopy, filename); 831 downcase(fnamecopy); 832 833 if (*fnamecopy == '\0') { 834 if (!dols) 835 return -1; 836 837 dols = LS_ROOT; 838 } else if ((idx = dirdelim(fnamecopy)) >= 0) { 839 isdir = 1; 840 fnamecopy[idx] = '\0'; 841 subname = fnamecopy + idx + 1; 842 843 /* Handle multiple delimiters */ 844 while (ISDIRDELIM(*subname)) 845 subname++; 846 } else if (dols) { 847 isdir = 1; 848 } 849 850 j = 0; 851 while (1) { 852 int i; 853 854 debug("FAT read sect=%d, clust_size=%d, DIRENTSPERBLOCK=%d\n", 855 cursect, mydata->clust_size, DIRENTSPERBLOCK); 856 857 if (disk_read(cursect, 858 (mydata->fatsize == 32) ? 859 (mydata->clust_size) : 860 LINEAR_PREFETCH_SIZE / SECTOR_SIZE, 861 do_fat_read_block) < 0) { 862 debug("Error: reading rootdir block\n"); 863 return -1; 864 } 865 866 dentptr = (dir_entry *) do_fat_read_block; 867 868 for (i = 0; i < DIRENTSPERBLOCK; i++) { 869 char s_name[14], l_name[VFAT_MAXLEN_BYTES]; 870 871 l_name[0] = '\0'; 872 if (dentptr->name[0] == DELETED_FLAG) { 873 dentptr++; 874 continue; 875 } 876 if ((dentptr->attr & ATTR_VOLUME)) { 877 #ifdef CONFIG_SUPPORT_VFAT 878 if ((dentptr->attr & ATTR_VFAT) && 879 (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) { 880 prevcksum = 881 ((dir_slot *)dentptr)->alias_checksum; 882 883 get_vfatname(mydata, 884 (mydata->fatsize == 32) ? 885 root_cluster : 886 0, 887 do_fat_read_block, 888 dentptr, l_name); 889 890 if (dols == LS_ROOT) { 891 char dirc; 892 int doit = 0; 893 int isdir = 894 (dentptr->attr & ATTR_DIR); 895 896 if (isdir) { 897 dirs++; 898 dirc = '/'; 899 doit = 1; 900 } else { 901 dirc = ' '; 902 if (l_name[0] != 0) { 903 files++; 904 doit = 1; 905 } 906 } 907 if (doit) { 908 if (dirc == ' ') { 909 printf(" %8ld %s%c\n", 910 (long)FAT2CPU32(dentptr->size), 911 l_name, 912 dirc); 913 } else { 914 printf(" %s%c\n", 915 l_name, 916 dirc); 917 } 918 } 919 dentptr++; 920 continue; 921 } 922 debug("Rootvfatname: |%s|\n", 923 l_name); 924 } else 925 #endif 926 { 927 /* Volume label or VFAT entry */ 928 dentptr++; 929 continue; 930 } 931 } else if (dentptr->name[0] == 0) { 932 debug("RootDentname == NULL - %d\n", i); 933 if (dols == LS_ROOT) { 934 printf("\n%d file(s), %d dir(s)\n\n", 935 files, dirs); 936 return 0; 937 } 938 return -1; 939 } 940 #ifdef CONFIG_SUPPORT_VFAT 941 else if (dols == LS_ROOT && 942 mkcksum(dentptr->name) == prevcksum) { 943 dentptr++; 944 continue; 945 } 946 #endif 947 get_name(dentptr, s_name); 948 949 if (dols == LS_ROOT) { 950 int isdir = (dentptr->attr & ATTR_DIR); 951 char dirc; 952 int doit = 0; 953 954 if (isdir) { 955 dirc = '/'; 956 if (s_name[0] != 0) { 957 dirs++; 958 doit = 1; 959 } 960 } else { 961 dirc = ' '; 962 if (s_name[0] != 0) { 963 files++; 964 doit = 1; 965 } 966 } 967 if (doit) { 968 if (dirc == ' ') { 969 printf(" %8ld %s%c\n", 970 (long)FAT2CPU32(dentptr->size), 971 s_name, dirc); 972 } else { 973 printf(" %s%c\n", 974 s_name, dirc); 975 } 976 } 977 dentptr++; 978 continue; 979 } 980 981 if (strcmp(fnamecopy, s_name) 982 && strcmp(fnamecopy, l_name)) { 983 debug("RootMismatch: |%s|%s|\n", s_name, 984 l_name); 985 dentptr++; 986 continue; 987 } 988 989 if (isdir && !(dentptr->attr & ATTR_DIR)) 990 return -1; 991 992 debug("RootName: %s", s_name); 993 debug(", start: 0x%x", START(dentptr)); 994 debug(", size: 0x%x %s\n", 995 FAT2CPU32(dentptr->size), 996 isdir ? "(DIR)" : ""); 997 998 goto rootdir_done; /* We got a match */ 999 } 1000 debug("END LOOP: j=%d clust_size=%d\n", j, 1001 mydata->clust_size); 1002 1003 /* 1004 * On FAT32 we must fetch the FAT entries for the next 1005 * root directory clusters when a cluster has been 1006 * completely processed. 1007 */ 1008 ++j; 1009 int fat32_end = 0; 1010 if ((mydata->fatsize == 32) && (j == mydata->clust_size)) { 1011 int nxtsect = 0; 1012 int nxt_clust = 0; 1013 1014 nxt_clust = get_fatent(mydata, root_cluster); 1015 fat32_end = CHECK_CLUST(nxt_clust, 32); 1016 1017 nxtsect = mydata->data_begin + 1018 (nxt_clust * mydata->clust_size); 1019 1020 root_cluster = nxt_clust; 1021 1022 cursect = nxtsect; 1023 j = 0; 1024 } else { 1025 cursect++; 1026 } 1027 1028 /* If end of rootdir reached */ 1029 if ((mydata->fatsize == 32 && fat32_end) || 1030 (mydata->fatsize != 32 && j == rootdir_size)) { 1031 if (dols == LS_ROOT) { 1032 printf("\n%d file(s), %d dir(s)\n\n", 1033 files, dirs); 1034 return 0; 1035 } else { 1036 return -1; 1037 } 1038 } 1039 } 1040 rootdir_done: 1041 1042 firsttime = 1; 1043 1044 while (isdir) { 1045 int startsect = mydata->data_begin 1046 + START(dentptr) * mydata->clust_size; 1047 dir_entry dent; 1048 char *nextname = NULL; 1049 1050 dent = *dentptr; 1051 dentptr = &dent; 1052 1053 idx = dirdelim(subname); 1054 1055 if (idx >= 0) { 1056 subname[idx] = '\0'; 1057 nextname = subname + idx + 1; 1058 /* Handle multiple delimiters */ 1059 while (ISDIRDELIM(*nextname)) 1060 nextname++; 1061 if (dols && *nextname == '\0') 1062 firsttime = 0; 1063 } else { 1064 if (dols && firsttime) { 1065 firsttime = 0; 1066 } else { 1067 isdir = 0; 1068 } 1069 } 1070 1071 if (get_dentfromdir(mydata, startsect, subname, dentptr, 1072 isdir ? 0 : dols) == NULL) { 1073 if (dols && !isdir) 1074 return 0; 1075 return -1; 1076 } 1077 1078 if (idx >= 0) { 1079 if (!(dentptr->attr & ATTR_DIR)) 1080 return -1; 1081 subname = nextname; 1082 } 1083 } 1084 1085 ret = get_contents(mydata, dentptr, buffer, maxsize); 1086 debug("Size: %d, got: %ld\n", FAT2CPU32(dentptr->size), ret); 1087 1088 return ret; 1089 } 1090 1091 int file_fat_detectfs (void) 1092 { 1093 boot_sector bs; 1094 volume_info volinfo; 1095 int fatsize; 1096 char vol_label[12]; 1097 1098 if (cur_dev == NULL) { 1099 printf("No current device\n"); 1100 return 1; 1101 } 1102 1103 #if defined(CONFIG_CMD_IDE) || \ 1104 defined(CONFIG_CMD_MG_DISK) || \ 1105 defined(CONFIG_CMD_SATA) || \ 1106 defined(CONFIG_CMD_SCSI) || \ 1107 defined(CONFIG_CMD_USB) || \ 1108 defined(CONFIG_MMC) 1109 printf("Interface: "); 1110 switch (cur_dev->if_type) { 1111 case IF_TYPE_IDE: 1112 printf("IDE"); 1113 break; 1114 case IF_TYPE_SATA: 1115 printf("SATA"); 1116 break; 1117 case IF_TYPE_SCSI: 1118 printf("SCSI"); 1119 break; 1120 case IF_TYPE_ATAPI: 1121 printf("ATAPI"); 1122 break; 1123 case IF_TYPE_USB: 1124 printf("USB"); 1125 break; 1126 case IF_TYPE_DOC: 1127 printf("DOC"); 1128 break; 1129 case IF_TYPE_MMC: 1130 printf("MMC"); 1131 break; 1132 default: 1133 printf("Unknown"); 1134 } 1135 1136 printf("\n Device %d: ", cur_dev->dev); 1137 dev_print(cur_dev); 1138 #endif 1139 1140 if (read_bootsectandvi(&bs, &volinfo, &fatsize)) { 1141 printf("\nNo valid FAT fs found\n"); 1142 return 1; 1143 } 1144 1145 memcpy(vol_label, volinfo.volume_label, 11); 1146 vol_label[11] = '\0'; 1147 volinfo.fs_type[5] = '\0'; 1148 1149 printf("Partition %d: Filesystem: %s \"%s\"\n", cur_part, 1150 volinfo.fs_type, vol_label); 1151 1152 return 0; 1153 } 1154 1155 int file_fat_ls (const char *dir) 1156 { 1157 return do_fat_read(dir, NULL, 0, LS_YES); 1158 } 1159 1160 long file_fat_read (const char *filename, void *buffer, unsigned long maxsize) 1161 { 1162 printf("reading %s\n", filename); 1163 return do_fat_read(filename, buffer, maxsize, LS_NO); 1164 } 1165