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 #if (CONFIG_COMMANDS & CFG_CMD_FAT) 35 36 #ifdef CONFIG_AUTO_UPDATE 37 /* the VFAT code has a bug which breaks auto update */ 38 #undef CONFIG_SUPPORT_VFAT 39 #endif 40 41 /* 42 * Convert a string to lowercase. 43 */ 44 static void 45 downcase(char *str) 46 { 47 while (*str != '\0') { 48 TOLOWER(*str); 49 str++; 50 } 51 } 52 53 static block_dev_desc_t *cur_dev = NULL; 54 static unsigned long part_offset = 0; 55 static int cur_part = 1; 56 57 #define DOS_PART_TBL_OFFSET 0x1be 58 #define DOS_PART_MAGIC_OFFSET 0x1fe 59 #define DOS_FS_TYPE_OFFSET 0x36 60 61 int disk_read (__u32 startblock, __u32 getsize, __u8 * bufptr) 62 { 63 startblock += part_offset; 64 if (cur_dev == NULL) 65 return -1; 66 if (cur_dev->block_read) { 67 return cur_dev->block_read (cur_dev->dev, startblock, getsize, (unsigned long *)bufptr); 68 } 69 return -1; 70 } 71 72 73 int 74 fat_register_device(block_dev_desc_t *dev_desc, int part_no) 75 { 76 unsigned char buffer[SECTOR_SIZE]; 77 78 if (!dev_desc->block_read) 79 return -1; 80 cur_dev=dev_desc; 81 /* check if we have a MBR (on floppies we have only a PBR) */ 82 if (dev_desc->block_read (dev_desc->dev, 0, 1, (ulong *) buffer) != 1) { 83 printf ("** Can't read from device %d **\n", 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(!strncmp(&buffer[DOS_FS_TYPE_OFFSET],"FAT",3)) { 92 /* ok, we assume we are on a PBR only */ 93 cur_part = 1; 94 part_offset=0; 95 } 96 else { 97 #if (CONFIG_COMMANDS & CFG_CMD_IDE) || (CONFIG_COMMANDS & CFG_CMD_SCSI) 98 disk_partition_t info; 99 if(!get_partition_info(dev_desc, part_no, &info)) { 100 part_offset = info.start; 101 cur_part = part_no; 102 } 103 else { 104 printf ("** Partition %d not valid on device %d **\n",part_no,dev_desc->dev); 105 return -1; 106 } 107 #else 108 /* FIXME we need to determine the start block of the 109 * partition where the DOS FS resides. This can be done 110 * by using the get_partition_info routine. For this 111 * purpose the libpart must be included. 112 */ 113 part_offset=32; 114 cur_part = 1; 115 #endif 116 } 117 return 0; 118 } 119 120 121 /* 122 * Get the first occurence of a directory delimiter ('/' or '\') in a string. 123 * Return index into string if found, -1 otherwise. 124 */ 125 static int 126 dirdelim(char *str) 127 { 128 char *start = str; 129 130 while (*str != '\0') { 131 if (ISDIRDELIM(*str)) return str - start; 132 str++; 133 } 134 return -1; 135 } 136 137 138 /* 139 * Match volume_info fs_type strings. 140 * Return 0 on match, -1 otherwise. 141 */ 142 static int 143 compare_sign(char *str1, char *str2) 144 { 145 char *end = str1+SIGNLEN; 146 147 while (str1 != end) { 148 if (*str1 != *str2) { 149 return -1; 150 } 151 str1++; 152 str2++; 153 } 154 155 return 0; 156 } 157 158 159 /* 160 * Extract zero terminated short name from a directory entry. 161 */ 162 static void get_name (dir_entry *dirent, char *s_name) 163 { 164 char *ptr; 165 166 memcpy (s_name, dirent->name, 8); 167 s_name[8] = '\0'; 168 ptr = s_name; 169 while (*ptr && *ptr != ' ') 170 ptr++; 171 if (dirent->ext[0] && dirent->ext[0] != ' ') { 172 *ptr = '.'; 173 ptr++; 174 memcpy (ptr, dirent->ext, 3); 175 ptr[3] = '\0'; 176 while (*ptr && *ptr != ' ') 177 ptr++; 178 } 179 *ptr = '\0'; 180 if (*s_name == DELETED_FLAG) 181 *s_name = '\0'; 182 else if (*s_name == aRING) 183 *s_name = '�'; 184 downcase (s_name); 185 } 186 187 /* 188 * Get the entry at index 'entry' in a FAT (12/16/32) table. 189 * On failure 0x00 is returned. 190 */ 191 static __u32 192 get_fatent(fsdata *mydata, __u32 entry) 193 { 194 __u32 bufnum; 195 __u32 offset; 196 __u32 ret = 0x00; 197 198 switch (mydata->fatsize) { 199 case 32: 200 bufnum = entry / FAT32BUFSIZE; 201 offset = entry - bufnum * FAT32BUFSIZE; 202 break; 203 case 16: 204 bufnum = entry / FAT16BUFSIZE; 205 offset = entry - bufnum * FAT16BUFSIZE; 206 break; 207 case 12: 208 bufnum = entry / FAT12BUFSIZE; 209 offset = entry - bufnum * FAT12BUFSIZE; 210 break; 211 212 default: 213 /* Unsupported FAT size */ 214 return ret; 215 } 216 217 /* Read a new block of FAT entries into the cache. */ 218 if (bufnum != mydata->fatbufnum) { 219 int getsize = FATBUFSIZE/FS_BLOCK_SIZE; 220 __u8 *bufptr = mydata->fatbuf; 221 __u32 fatlength = mydata->fatlength; 222 __u32 startblock = bufnum * FATBUFBLOCKS; 223 224 fatlength *= SECTOR_SIZE; /* We want it in bytes now */ 225 startblock += mydata->fat_sect; /* Offset from start of disk */ 226 227 if (getsize > fatlength) getsize = fatlength; 228 if (disk_read(startblock, getsize, bufptr) < 0) { 229 FAT_DPRINT("Error reading FAT blocks\n"); 230 return ret; 231 } 232 mydata->fatbufnum = bufnum; 233 } 234 235 /* Get the actual entry from the table */ 236 switch (mydata->fatsize) { 237 case 32: 238 ret = FAT2CPU32(((__u32*)mydata->fatbuf)[offset]); 239 break; 240 case 16: 241 ret = FAT2CPU16(((__u16*)mydata->fatbuf)[offset]); 242 break; 243 case 12: { 244 __u32 off16 = (offset*3)/4; 245 __u16 val1, val2; 246 247 switch (offset & 0x3) { 248 case 0: 249 ret = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]); 250 ret &= 0xfff; 251 break; 252 case 1: 253 val1 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]); 254 val1 &= 0xf000; 255 val2 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16+1]); 256 val2 &= 0x00ff; 257 ret = (val2 << 4) | (val1 >> 12); 258 break; 259 case 2: 260 val1 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]); 261 val1 &= 0xff00; 262 val2 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16+1]); 263 val2 &= 0x000f; 264 ret = (val2 << 8) | (val1 >> 8); 265 break; 266 case 3: 267 ret = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);; 268 ret = (ret & 0xfff0) >> 4; 269 break; 270 default: 271 break; 272 } 273 } 274 break; 275 } 276 FAT_DPRINT("ret: %d, offset: %d\n", ret, offset); 277 278 return ret; 279 } 280 281 282 /* 283 * Read at most 'size' bytes from the specified cluster into 'buffer'. 284 * Return 0 on success, -1 otherwise. 285 */ 286 static int 287 get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size) 288 { 289 int idx = 0; 290 __u32 startsect; 291 292 if (clustnum > 0) { 293 startsect = mydata->data_begin + clustnum*mydata->clust_size; 294 } else { 295 startsect = mydata->rootdir_sect; 296 } 297 298 FAT_DPRINT("gc - clustnum: %d, startsect: %d\n", clustnum, startsect); 299 if (disk_read(startsect, size/FS_BLOCK_SIZE , buffer) < 0) { 300 FAT_DPRINT("Error reading data\n"); 301 return -1; 302 } 303 if(size % FS_BLOCK_SIZE) { 304 __u8 tmpbuf[FS_BLOCK_SIZE]; 305 idx= size/FS_BLOCK_SIZE; 306 if (disk_read(startsect + idx, 1, tmpbuf) < 0) { 307 FAT_DPRINT("Error reading data\n"); 308 return -1; 309 } 310 buffer += idx*FS_BLOCK_SIZE; 311 312 memcpy(buffer, tmpbuf, size % FS_BLOCK_SIZE); 313 return 0; 314 } 315 316 return 0; 317 } 318 319 320 /* 321 * Read at most 'maxsize' bytes from the file associated with 'dentptr' 322 * into 'buffer'. 323 * Return the number of bytes read or -1 on fatal errors. 324 */ 325 static long 326 get_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer, 327 unsigned long maxsize) 328 { 329 unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0; 330 unsigned int bytesperclust = mydata->clust_size * SECTOR_SIZE; 331 __u32 curclust = START(dentptr); 332 __u32 endclust, newclust; 333 unsigned long actsize; 334 335 FAT_DPRINT("Filesize: %ld bytes\n", filesize); 336 337 if (maxsize > 0 && filesize > maxsize) filesize = maxsize; 338 339 FAT_DPRINT("Reading: %ld bytes\n", filesize); 340 341 actsize=bytesperclust; 342 endclust=curclust; 343 do { 344 /* search for consecutive clusters */ 345 while(actsize < filesize) { 346 newclust = get_fatent(mydata, endclust); 347 if((newclust -1)!=endclust) 348 goto getit; 349 if (newclust <= 0x0001 || newclust >= 0xfff0) { 350 FAT_DPRINT("curclust: 0x%x\n", newclust); 351 FAT_DPRINT("Invalid FAT entry\n"); 352 return gotsize; 353 } 354 endclust=newclust; 355 actsize+= bytesperclust; 356 } 357 /* actsize >= file size */ 358 actsize -= bytesperclust; 359 /* get remaining clusters */ 360 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 361 FAT_ERROR("Error reading cluster\n"); 362 return -1; 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 FAT_ERROR("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 FAT_ERROR("Error reading cluster\n"); 378 return -1; 379 } 380 gotsize += (int)actsize; 381 filesize -= actsize; 382 buffer += actsize; 383 curclust = get_fatent(mydata, endclust); 384 if (curclust <= 0x0001 || curclust >= 0xfff0) { 385 FAT_DPRINT("curclust: 0x%x\n", curclust); 386 FAT_ERROR("Invalid FAT entry\n"); 387 return gotsize; 388 } 389 actsize=bytesperclust; 390 endclust=curclust; 391 } while (1); 392 } 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 402 slot2str(dir_slot *slotptr, char *l_name, int *idx) 403 { 404 int j; 405 406 for (j = 0; j <= 8; j += 2) { 407 l_name[*idx] = slotptr->name0_4[j]; 408 if (l_name[*idx] == 0x00) 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) return 1; 414 (*idx)++; 415 } 416 for (j = 0; j <= 2; j += 2) { 417 l_name[*idx] = slotptr->name11_12[j]; 418 if (l_name[*idx] == 0x00) return 1; 419 (*idx)++; 420 } 421 422 return 0; 423 } 424 425 426 /* 427 * Extract the full long filename starting at 'retdent' (which is really 428 * a slot) into 'l_name'. If successful also copy the real directory entry 429 * into 'retdent' 430 * Return 0 on success, -1 otherwise. 431 */ 432 static int 433 get_vfatname(fsdata *mydata, int curclust, __u8 *cluster, 434 dir_entry *retdent, char *l_name) 435 { 436 dir_entry *realdent; 437 dir_slot *slotptr = (dir_slot*) retdent; 438 __u8 *nextclust = cluster + mydata->clust_size * SECTOR_SIZE; 439 __u8 counter = slotptr->id & 0xf; 440 int idx = 0; 441 442 while ((__u8*)slotptr < nextclust) { 443 if (counter == 0) break; 444 if ((slotptr->id & 0x0f) != counter) return -1; 445 slotptr++; 446 counter--; 447 } 448 449 if ((__u8*)slotptr >= nextclust) { 450 __u8 block[MAX_CLUSTSIZE]; 451 dir_slot *slotptr2; 452 453 slotptr--; 454 curclust = get_fatent(mydata, curclust); 455 if (curclust <= 0x0001 || curclust >= 0xfff0) { 456 FAT_DPRINT("curclust: 0x%x\n", curclust); 457 FAT_ERROR("Invalid FAT entry\n"); 458 return -1; 459 } 460 if (get_cluster(mydata, curclust, block, 461 mydata->clust_size * SECTOR_SIZE) != 0) { 462 FAT_DPRINT("Error: reading directory block\n"); 463 return -1; 464 } 465 slotptr2 = (dir_slot*) block; 466 while (slotptr2->id > 0x01) { 467 slotptr2++; 468 } 469 /* Save the real directory entry */ 470 realdent = (dir_entry*)slotptr2 + 1; 471 while ((__u8*)slotptr2 >= block) { 472 slot2str(slotptr2, l_name, &idx); 473 slotptr2--; 474 } 475 } else { 476 /* Save the real directory entry */ 477 realdent = (dir_entry*)slotptr; 478 } 479 480 do { 481 slotptr--; 482 if (slot2str(slotptr, l_name, &idx)) break; 483 } while (!(slotptr->id & 0x40)); 484 485 l_name[idx] = '\0'; 486 if (*l_name == DELETED_FLAG) *l_name = '\0'; 487 else if (*l_name == aRING) *l_name = '�'; 488 downcase(l_name); 489 490 /* Return the real directory entry */ 491 memcpy(retdent, realdent, sizeof(dir_entry)); 492 493 return 0; 494 } 495 496 497 /* Calculate short name checksum */ 498 static __u8 499 mkcksum(const char *str) 500 { 501 int i; 502 __u8 ret = 0; 503 504 for (i = 0; i < 11; i++) { 505 ret = (((ret&1)<<7)|((ret&0xfe)>>1)) + str[i]; 506 } 507 508 return ret; 509 } 510 #endif 511 512 513 /* 514 * Get the directory entry associated with 'filename' from the directory 515 * starting at 'startsect' 516 */ 517 static dir_entry *get_dentfromdir (fsdata * mydata, int startsect, 518 char *filename, dir_entry * retdent, 519 int dols) 520 { 521 __u16 prevcksum = 0xffff; 522 __u8 block[MAX_CLUSTSIZE]; 523 __u32 curclust = START (retdent); 524 int files = 0, dirs = 0; 525 526 FAT_DPRINT ("get_dentfromdir: %s\n", filename); 527 while (1) { 528 dir_entry *dentptr; 529 int i; 530 531 if (get_cluster (mydata, curclust, block, 532 mydata->clust_size * SECTOR_SIZE) != 0) { 533 FAT_DPRINT ("Error: reading directory block\n"); 534 return NULL; 535 } 536 dentptr = (dir_entry *) block; 537 for (i = 0; i < DIRENTSPERCLUST; i++) { 538 char s_name[14], l_name[256]; 539 540 l_name[0] = '\0'; 541 if ((dentptr->attr & ATTR_VOLUME)) { 542 #ifdef CONFIG_SUPPORT_VFAT 543 if ((dentptr->attr & ATTR_VFAT) && 544 (dentptr->name[0] & 0x40)) { 545 prevcksum = ((dir_slot *) dentptr) 546 ->alias_checksum; 547 get_vfatname (mydata, curclust, block, 548 dentptr, l_name); 549 if (dols) { 550 int isdir = (dentptr->attr & ATTR_DIR); 551 char dirc; 552 int doit = 0; 553 554 if (isdir) { 555 dirs++; 556 dirc = '/'; 557 doit = 1; 558 } else { 559 dirc = ' '; 560 if (l_name[0] != 0) { 561 files++; 562 doit = 1; 563 } 564 } 565 if (doit) { 566 if (dirc == ' ') { 567 printf (" %8ld %s%c\n", 568 (long) FAT2CPU32 (dentptr->size), 569 l_name, dirc); 570 } else { 571 printf (" %s%c\n", l_name, dirc); 572 } 573 } 574 dentptr++; 575 continue; 576 } 577 FAT_DPRINT ("vfatname: |%s|\n", l_name); 578 } else 579 #endif 580 { 581 /* Volume label or VFAT entry */ 582 dentptr++; 583 continue; 584 } 585 } 586 if (dentptr->name[0] == 0) { 587 if (dols) { 588 printf ("\n%d file(s), %d dir(s)\n\n", files, dirs); 589 } 590 FAT_DPRINT ("Dentname == NULL - %d\n", i); 591 return NULL; 592 } 593 #ifdef CONFIG_SUPPORT_VFAT 594 if (dols && mkcksum (dentptr->name) == prevcksum) { 595 dentptr++; 596 continue; 597 } 598 #endif 599 get_name (dentptr, s_name); 600 if (dols) { 601 int isdir = (dentptr->attr & ATTR_DIR); 602 char dirc; 603 int doit = 0; 604 605 if (isdir) { 606 dirs++; 607 dirc = '/'; 608 doit = 1; 609 } else { 610 dirc = ' '; 611 if (s_name[0] != 0) { 612 files++; 613 doit = 1; 614 } 615 } 616 if (doit) { 617 if (dirc == ' ') { 618 printf (" %8ld %s%c\n", 619 (long) FAT2CPU32 (dentptr->size), s_name, 620 dirc); 621 } else { 622 printf (" %s%c\n", s_name, dirc); 623 } 624 } 625 dentptr++; 626 continue; 627 } 628 if (strcmp (filename, s_name) && strcmp (filename, l_name)) { 629 FAT_DPRINT ("Mismatch: |%s|%s|\n", s_name, l_name); 630 dentptr++; 631 continue; 632 } 633 memcpy (retdent, dentptr, sizeof (dir_entry)); 634 635 FAT_DPRINT ("DentName: %s", s_name); 636 FAT_DPRINT (", start: 0x%x", START (dentptr)); 637 FAT_DPRINT (", size: 0x%x %s\n", 638 FAT2CPU32 (dentptr->size), 639 (dentptr->attr & ATTR_DIR) ? "(DIR)" : ""); 640 641 return retdent; 642 } 643 curclust = get_fatent (mydata, curclust); 644 if (curclust <= 0x0001 || curclust >= 0xfff0) { 645 FAT_DPRINT ("curclust: 0x%x\n", curclust); 646 FAT_ERROR ("Invalid FAT entry\n"); 647 return NULL; 648 } 649 } 650 651 return NULL; 652 } 653 654 655 /* 656 * Read boot sector and volume info from a FAT filesystem 657 */ 658 static int 659 read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize) 660 { 661 __u8 block[FS_BLOCK_SIZE]; 662 volume_info *vistart; 663 664 if (disk_read(0, 1, block) < 0) { 665 FAT_DPRINT("Error: reading block\n"); 666 return -1; 667 } 668 669 memcpy(bs, block, sizeof(boot_sector)); 670 bs->reserved = FAT2CPU16(bs->reserved); 671 bs->fat_length = FAT2CPU16(bs->fat_length); 672 bs->secs_track = FAT2CPU16(bs->secs_track); 673 bs->heads = FAT2CPU16(bs->heads); 674 #if 0 /* UNUSED */ 675 bs->hidden = FAT2CPU32(bs->hidden); 676 #endif 677 bs->total_sect = FAT2CPU32(bs->total_sect); 678 679 /* FAT32 entries */ 680 if (bs->fat_length == 0) { 681 /* Assume FAT32 */ 682 bs->fat32_length = FAT2CPU32(bs->fat32_length); 683 bs->flags = FAT2CPU16(bs->flags); 684 bs->root_cluster = FAT2CPU32(bs->root_cluster); 685 bs->info_sector = FAT2CPU16(bs->info_sector); 686 bs->backup_boot = FAT2CPU16(bs->backup_boot); 687 vistart = (volume_info*) (block + sizeof(boot_sector)); 688 *fatsize = 32; 689 } else { 690 vistart = (volume_info*) &(bs->fat32_length); 691 *fatsize = 0; 692 } 693 memcpy(volinfo, vistart, sizeof(volume_info)); 694 695 /* Terminate fs_type string. Writing past the end of vistart 696 is ok - it's just the buffer. */ 697 vistart->fs_type[8] = '\0'; 698 699 if (*fatsize == 32) { 700 if (compare_sign(FAT32_SIGN, vistart->fs_type) == 0) { 701 return 0; 702 } 703 } else { 704 if (compare_sign(FAT12_SIGN, vistart->fs_type) == 0) { 705 *fatsize = 12; 706 return 0; 707 } 708 if (compare_sign(FAT16_SIGN, vistart->fs_type) == 0) { 709 *fatsize = 16; 710 return 0; 711 } 712 } 713 714 FAT_DPRINT("Error: broken fs_type sign\n"); 715 return -1; 716 } 717 718 719 static long 720 do_fat_read (const char *filename, void *buffer, unsigned long maxsize, 721 int dols) 722 { 723 __u8 block[MAX_CLUSTSIZE]; /* Block buffer */ 724 char fnamecopy[2048]; 725 boot_sector bs; 726 volume_info volinfo; 727 fsdata datablock; 728 fsdata *mydata = &datablock; 729 dir_entry *dentptr; 730 __u16 prevcksum = 0xffff; 731 char *subname = ""; 732 int rootdir_size, cursect; 733 int idx, isdir = 0; 734 int files = 0, dirs = 0; 735 long ret = 0; 736 int firsttime; 737 738 if (read_bootsectandvi (&bs, &volinfo, &mydata->fatsize)) { 739 FAT_DPRINT ("Error: reading boot sector\n"); 740 return -1; 741 } 742 if (mydata->fatsize == 32) { 743 mydata->fatlength = bs.fat32_length; 744 } else { 745 mydata->fatlength = bs.fat_length; 746 } 747 mydata->fat_sect = bs.reserved; 748 cursect = mydata->rootdir_sect 749 = mydata->fat_sect + mydata->fatlength * bs.fats; 750 mydata->clust_size = bs.cluster_size; 751 if (mydata->fatsize == 32) { 752 rootdir_size = mydata->clust_size; 753 mydata->data_begin = mydata->rootdir_sect /* + rootdir_size */ 754 - (mydata->clust_size * 2); 755 } else { 756 rootdir_size = ((bs.dir_entries[1] * (int) 256 + bs.dir_entries[0]) 757 * sizeof (dir_entry)) / SECTOR_SIZE; 758 mydata->data_begin = mydata->rootdir_sect + rootdir_size 759 - (mydata->clust_size * 2); 760 } 761 mydata->fatbufnum = -1; 762 763 FAT_DPRINT ("FAT%d, fatlength: %d\n", mydata->fatsize, 764 mydata->fatlength); 765 FAT_DPRINT ("Rootdir begins at sector: %d, offset: %x, size: %d\n" 766 "Data begins at: %d\n", 767 mydata->rootdir_sect, mydata->rootdir_sect * SECTOR_SIZE, 768 rootdir_size, mydata->data_begin); 769 FAT_DPRINT ("Cluster size: %d\n", mydata->clust_size); 770 771 /* "cwd" is always the root... */ 772 while (ISDIRDELIM (*filename)) 773 filename++; 774 /* Make a copy of the filename and convert it to lowercase */ 775 strcpy (fnamecopy, filename); 776 downcase (fnamecopy); 777 if (*fnamecopy == '\0') { 778 if (!dols) 779 return -1; 780 dols = LS_ROOT; 781 } else if ((idx = dirdelim (fnamecopy)) >= 0) { 782 isdir = 1; 783 fnamecopy[idx] = '\0'; 784 subname = fnamecopy + idx + 1; 785 /* Handle multiple delimiters */ 786 while (ISDIRDELIM (*subname)) 787 subname++; 788 } else if (dols) { 789 isdir = 1; 790 } 791 792 while (1) { 793 int i; 794 795 if (disk_read (cursect, mydata->clust_size, block) < 0) { 796 FAT_DPRINT ("Error: reading rootdir block\n"); 797 return -1; 798 } 799 dentptr = (dir_entry *) block; 800 for (i = 0; i < DIRENTSPERBLOCK; i++) { 801 char s_name[14], l_name[256]; 802 803 l_name[0] = '\0'; 804 if ((dentptr->attr & ATTR_VOLUME)) { 805 #ifdef CONFIG_SUPPORT_VFAT 806 if ((dentptr->attr & ATTR_VFAT) && 807 (dentptr->name[0] & 0x40)) { 808 prevcksum = ((dir_slot *) dentptr)->alias_checksum; 809 get_vfatname (mydata, 0, block, dentptr, l_name); 810 if (dols == LS_ROOT) { 811 int isdir = (dentptr->attr & ATTR_DIR); 812 char dirc; 813 int doit = 0; 814 815 if (isdir) { 816 dirs++; 817 dirc = '/'; 818 doit = 1; 819 } else { 820 dirc = ' '; 821 if (l_name[0] != 0) { 822 files++; 823 doit = 1; 824 } 825 } 826 if (doit) { 827 if (dirc == ' ') { 828 printf (" %8ld %s%c\n", 829 (long) FAT2CPU32 (dentptr->size), 830 l_name, dirc); 831 } else { 832 printf (" %s%c\n", l_name, dirc); 833 } 834 } 835 dentptr++; 836 continue; 837 } 838 FAT_DPRINT ("Rootvfatname: |%s|\n", l_name); 839 } else 840 #endif 841 { 842 /* Volume label or VFAT entry */ 843 dentptr++; 844 continue; 845 } 846 } else if (dentptr->name[0] == 0) { 847 FAT_DPRINT ("RootDentname == NULL - %d\n", i); 848 if (dols == LS_ROOT) { 849 printf ("\n%d file(s), %d dir(s)\n\n", files, dirs); 850 return 0; 851 } 852 return -1; 853 } 854 #ifdef CONFIG_SUPPORT_VFAT 855 else if (dols == LS_ROOT 856 && mkcksum (dentptr->name) == prevcksum) { 857 dentptr++; 858 continue; 859 } 860 #endif 861 get_name (dentptr, s_name); 862 if (dols == LS_ROOT) { 863 int isdir = (dentptr->attr & ATTR_DIR); 864 char dirc; 865 int doit = 0; 866 867 if (isdir) { 868 dirc = '/'; 869 if (s_name[0] != 0) { 870 dirs++; 871 doit = 1; 872 } 873 } else { 874 dirc = ' '; 875 if (s_name[0] != 0) { 876 files++; 877 doit = 1; 878 } 879 } 880 if (doit) { 881 if (dirc == ' ') { 882 printf (" %8ld %s%c\n", 883 (long) FAT2CPU32 (dentptr->size), s_name, 884 dirc); 885 } else { 886 printf (" %s%c\n", s_name, dirc); 887 } 888 } 889 dentptr++; 890 continue; 891 } 892 if (strcmp (fnamecopy, s_name) && strcmp (fnamecopy, l_name)) { 893 FAT_DPRINT ("RootMismatch: |%s|%s|\n", s_name, l_name); 894 dentptr++; 895 continue; 896 } 897 if (isdir && !(dentptr->attr & ATTR_DIR)) 898 return -1; 899 900 FAT_DPRINT ("RootName: %s", s_name); 901 FAT_DPRINT (", start: 0x%x", START (dentptr)); 902 FAT_DPRINT (", size: 0x%x %s\n", 903 FAT2CPU32 (dentptr->size), isdir ? "(DIR)" : ""); 904 905 goto rootdir_done; /* We got a match */ 906 } 907 cursect++; 908 } 909 rootdir_done: 910 911 firsttime = 1; 912 while (isdir) { 913 int startsect = mydata->data_begin 914 + START (dentptr) * mydata->clust_size; 915 dir_entry dent; 916 char *nextname = NULL; 917 918 dent = *dentptr; 919 dentptr = &dent; 920 921 idx = dirdelim (subname); 922 if (idx >= 0) { 923 subname[idx] = '\0'; 924 nextname = subname + idx + 1; 925 /* Handle multiple delimiters */ 926 while (ISDIRDELIM (*nextname)) 927 nextname++; 928 if (dols && *nextname == '\0') 929 firsttime = 0; 930 } else { 931 if (dols && firsttime) { 932 firsttime = 0; 933 } else { 934 isdir = 0; 935 } 936 } 937 938 if (get_dentfromdir (mydata, startsect, subname, dentptr, 939 isdir ? 0 : dols) == NULL) { 940 if (dols && !isdir) 941 return 0; 942 return -1; 943 } 944 945 if (idx >= 0) { 946 if (!(dentptr->attr & ATTR_DIR)) 947 return -1; 948 subname = nextname; 949 } 950 } 951 ret = get_contents (mydata, dentptr, buffer, maxsize); 952 FAT_DPRINT ("Size: %d, got: %ld\n", FAT2CPU32 (dentptr->size), ret); 953 954 return ret; 955 } 956 957 958 int 959 file_fat_detectfs(void) 960 { 961 boot_sector bs; 962 volume_info volinfo; 963 int fatsize; 964 char vol_label[12]; 965 966 if(cur_dev==NULL) { 967 printf("No current device\n"); 968 return 1; 969 } 970 #if (CONFIG_COMMANDS & CFG_CMD_IDE) || (CONFIG_COMMANDS & CFG_CMD_SCSI) 971 printf("Interface: "); 972 switch(cur_dev->if_type) { 973 case IF_TYPE_IDE : printf("IDE"); break; 974 case IF_TYPE_SCSI : printf("SCSI"); break; 975 case IF_TYPE_ATAPI : printf("ATAPI"); break; 976 case IF_TYPE_USB : printf("USB"); break; 977 case IF_TYPE_DOC : printf("DOC"); break; 978 case IF_TYPE_MMC : printf("MMC"); break; 979 default : printf("Unknown"); 980 } 981 printf("\n Device %d: ",cur_dev->dev); 982 dev_print(cur_dev); 983 #endif 984 if(read_bootsectandvi(&bs, &volinfo, &fatsize)) { 985 printf("\nNo valid FAT fs found\n"); 986 return 1; 987 } 988 memcpy (vol_label, volinfo.volume_label, 11); 989 vol_label[11] = '\0'; 990 volinfo.fs_type[5]='\0'; 991 printf("Partition %d: Filesystem: %s \"%s\"\n",cur_part,volinfo.fs_type,vol_label); 992 return 0; 993 } 994 995 996 int 997 file_fat_ls(const char *dir) 998 { 999 return do_fat_read(dir, NULL, 0, LS_YES); 1000 } 1001 1002 1003 long 1004 file_fat_read(const char *filename, void *buffer, unsigned long maxsize) 1005 { 1006 printf("reading %s\n",filename); 1007 return do_fat_read(filename, buffer, maxsize, LS_NO); 1008 } 1009 1010 #endif /* #if (CONFIG_COMMANDS & CFG_CMD_FAT) */ 1011