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 /* 37 * Convert a string to lowercase. 38 */ 39 static void 40 downcase(char *str) 41 { 42 while (*str != '\0') { 43 TOLOWER(*str); 44 str++; 45 } 46 } 47 48 static block_dev_desc_t *cur_dev = NULL; 49 static unsigned long part_offset = 0; 50 static int cur_part = 1; 51 52 #define DOS_PART_TBL_OFFSET 0x1be 53 #define DOS_PART_MAGIC_OFFSET 0x1fe 54 #define DOS_FS_TYPE_OFFSET 0x36 55 56 int disk_read (__u32 startblock, __u32 getsize, __u8 * bufptr) 57 { 58 startblock += part_offset; 59 if (cur_dev == NULL) 60 return -1; 61 if (cur_dev->block_read) { 62 return cur_dev->block_read (cur_dev->dev, startblock, getsize, (unsigned long *)bufptr); 63 } 64 return -1; 65 } 66 67 68 int 69 fat_register_device(block_dev_desc_t *dev_desc, int part_no) 70 { 71 unsigned char buffer[SECTOR_SIZE]; 72 73 if (!dev_desc->block_read) 74 return -1; 75 cur_dev=dev_desc; 76 /* check if we have a MBR (on floppies we have only a PBR) */ 77 if (dev_desc->block_read (dev_desc->dev, 0, 1, (ulong *) buffer) != 1) { 78 printf ("** Can't read from device %d **\n", dev_desc->dev); 79 return -1; 80 } 81 if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 || 82 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) { 83 /* no signature found */ 84 return -1; 85 } 86 if(!strncmp(&buffer[DOS_FS_TYPE_OFFSET],"FAT",3)) { 87 /* ok, we assume we are on a PBR only */ 88 cur_part = 1; 89 part_offset=0; 90 } 91 else { 92 #if (CONFIG_COMMANDS & CFG_CMD_IDE) || (CONFIG_COMMANDS & CFG_CMD_SCSI) 93 disk_partition_t info; 94 if(!get_partition_info(dev_desc, part_no, &info)) { 95 part_offset = info.start; 96 cur_part = part_no; 97 } 98 else { 99 printf ("** Partition %d not valid on device %d **\n",part_no,dev_desc->dev); 100 return -1; 101 } 102 #else 103 /* FIXME we need to determine the start block of the 104 * partition where the DOS FS resides. This can be done 105 * by using the get_partition_info routine. For this 106 * purpose the libpart must be included. 107 */ 108 part_offset=32; 109 cur_part = 1; 110 #endif 111 } 112 return 0; 113 } 114 115 116 /* 117 * Get the first occurence of a directory delimiter ('/' or '\') in a string. 118 * Return index into string if found, -1 otherwise. 119 */ 120 static int 121 dirdelim(char *str) 122 { 123 char *start = str; 124 125 while (*str != '\0') { 126 if (ISDIRDELIM(*str)) return str - start; 127 str++; 128 } 129 return -1; 130 } 131 132 133 /* 134 * Match volume_info fs_type strings. 135 * Return 0 on match, -1 otherwise. 136 */ 137 static int 138 compare_sign(char *str1, char *str2) 139 { 140 char *end = str1+SIGNLEN; 141 142 while (str1 != end) { 143 if (*str1 != *str2) { 144 return -1; 145 } 146 str1++; 147 str2++; 148 } 149 150 return 0; 151 } 152 153 154 /* 155 * Extract zero terminated short name from a directory entry. 156 */ 157 static void get_name (dir_entry *dirent, char *s_name) 158 { 159 char *ptr; 160 161 memcpy (s_name, dirent->name, 8); 162 s_name[8] = '\0'; 163 ptr = s_name; 164 while (*ptr && *ptr != ' ') 165 ptr++; 166 if (dirent->ext[0] && dirent->ext[0] != ' ') { 167 *ptr = '.'; 168 ptr++; 169 memcpy (ptr, dirent->ext, 3); 170 ptr[3] = '\0'; 171 while (*ptr && *ptr != ' ') 172 ptr++; 173 } 174 *ptr = '\0'; 175 if (*s_name == DELETED_FLAG) 176 *s_name = '\0'; 177 else if (*s_name == aRING) 178 *s_name = '�'; 179 downcase (s_name); 180 } 181 182 /* 183 * Get the entry at index 'entry' in a FAT (12/16/32) table. 184 * On failure 0x00 is returned. 185 */ 186 static __u32 187 get_fatent(fsdata *mydata, __u32 entry) 188 { 189 __u32 bufnum; 190 __u32 offset; 191 __u32 ret = 0x00; 192 193 switch (mydata->fatsize) { 194 case 32: 195 bufnum = entry / FAT32BUFSIZE; 196 offset = entry - bufnum * FAT32BUFSIZE; 197 break; 198 case 16: 199 bufnum = entry / FAT16BUFSIZE; 200 offset = entry - bufnum * FAT16BUFSIZE; 201 break; 202 case 12: 203 bufnum = entry / FAT12BUFSIZE; 204 offset = entry - bufnum * FAT12BUFSIZE; 205 break; 206 207 default: 208 /* Unsupported FAT size */ 209 return ret; 210 } 211 212 /* Read a new block of FAT entries into the cache. */ 213 if (bufnum != mydata->fatbufnum) { 214 int getsize = FATBUFSIZE/FS_BLOCK_SIZE; 215 __u8 *bufptr = mydata->fatbuf; 216 __u32 fatlength = mydata->fatlength; 217 __u32 startblock = bufnum * FATBUFBLOCKS; 218 219 fatlength *= SECTOR_SIZE; /* We want it in bytes now */ 220 startblock += mydata->fat_sect; /* Offset from start of disk */ 221 222 if (getsize > fatlength) getsize = fatlength; 223 if (disk_read(startblock, getsize, bufptr) < 0) { 224 FAT_DPRINT("Error reading FAT blocks\n"); 225 return ret; 226 } 227 mydata->fatbufnum = bufnum; 228 } 229 230 /* Get the actual entry from the table */ 231 switch (mydata->fatsize) { 232 case 32: 233 ret = FAT2CPU32(((__u32*)mydata->fatbuf)[offset]); 234 break; 235 case 16: 236 ret = FAT2CPU16(((__u16*)mydata->fatbuf)[offset]); 237 break; 238 case 12: { 239 __u32 off16 = (offset*3)/4; 240 __u16 val1, val2; 241 242 switch (offset & 0x3) { 243 case 0: 244 ret = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]); 245 ret &= 0xfff; 246 break; 247 case 1: 248 val1 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]); 249 val1 &= 0xf000; 250 val2 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16+1]); 251 val2 &= 0x00ff; 252 ret = (val2 << 4) | (val1 >> 12); 253 break; 254 case 2: 255 val1 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]); 256 val1 &= 0xff00; 257 val2 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16+1]); 258 val2 &= 0x000f; 259 ret = (val2 << 8) | (val1 >> 8); 260 break; 261 case 3: 262 ret = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);; 263 ret = (ret & 0xfff0) >> 4; 264 break; 265 default: 266 break; 267 } 268 } 269 break; 270 } 271 FAT_DPRINT("ret: %d, offset: %d\n", ret, offset); 272 273 return ret; 274 } 275 276 277 /* 278 * Read at most 'size' bytes from the specified cluster into 'buffer'. 279 * Return 0 on success, -1 otherwise. 280 */ 281 static int 282 get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size) 283 { 284 int idx = 0; 285 __u32 startsect; 286 287 if (clustnum > 0) { 288 startsect = mydata->data_begin + clustnum*mydata->clust_size; 289 } else { 290 startsect = mydata->rootdir_sect; 291 } 292 293 FAT_DPRINT("gc - clustnum: %d, startsect: %d\n", clustnum, startsect); 294 if (disk_read(startsect, size/FS_BLOCK_SIZE , buffer) < 0) { 295 FAT_DPRINT("Error reading data\n"); 296 return -1; 297 } 298 if(size % FS_BLOCK_SIZE) { 299 __u8 tmpbuf[FS_BLOCK_SIZE]; 300 idx= size/FS_BLOCK_SIZE; 301 if (disk_read(startsect + idx, 1, tmpbuf) < 0) { 302 FAT_DPRINT("Error reading data\n"); 303 return -1; 304 } 305 buffer += idx*FS_BLOCK_SIZE; 306 307 memcpy(buffer, tmpbuf, size % FS_BLOCK_SIZE); 308 return 0; 309 } 310 311 return 0; 312 } 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 FAT_DPRINT("Filesize: %ld bytes\n", filesize); 331 332 if (maxsize > 0 && filesize > maxsize) filesize = maxsize; 333 334 FAT_DPRINT("Reading: %ld bytes\n", filesize); 335 336 actsize=bytesperclust; 337 endclust=curclust; 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 (newclust <= 0x0001 || newclust >= 0xfff0) { 345 FAT_DPRINT("curclust: 0x%x\n", newclust); 346 FAT_DPRINT("Invalid FAT entry\n"); 347 return gotsize; 348 } 349 endclust=newclust; 350 actsize+= bytesperclust; 351 } 352 /* actsize >= file size */ 353 actsize -= bytesperclust; 354 /* get remaining clusters */ 355 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 356 FAT_ERROR("Error reading cluster\n"); 357 return -1; 358 } 359 /* get remaining bytes */ 360 gotsize += (int)actsize; 361 filesize -= actsize; 362 buffer += actsize; 363 actsize= filesize; 364 if (get_cluster(mydata, endclust, buffer, (int)actsize) != 0) { 365 FAT_ERROR("Error reading cluster\n"); 366 return -1; 367 } 368 gotsize+=actsize; 369 return gotsize; 370 getit: 371 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 372 FAT_ERROR("Error reading cluster\n"); 373 return -1; 374 } 375 gotsize += (int)actsize; 376 filesize -= actsize; 377 buffer += actsize; 378 curclust = get_fatent(mydata, endclust); 379 if (curclust <= 0x0001 || curclust >= 0xfff0) { 380 FAT_DPRINT("curclust: 0x%x\n", curclust); 381 FAT_ERROR("Invalid FAT entry\n"); 382 return gotsize; 383 } 384 actsize=bytesperclust; 385 endclust=curclust; 386 } while (1); 387 } 388 389 390 #ifdef CONFIG_SUPPORT_VFAT 391 /* 392 * Extract the file name information from 'slotptr' into 'l_name', 393 * starting at l_name[*idx]. 394 * Return 1 if terminator (zero byte) is found, 0 otherwise. 395 */ 396 static int 397 slot2str(dir_slot *slotptr, char *l_name, int *idx) 398 { 399 int j; 400 401 for (j = 0; j <= 8; j += 2) { 402 l_name[*idx] = slotptr->name0_4[j]; 403 if (l_name[*idx] == 0x00) return 1; 404 (*idx)++; 405 } 406 for (j = 0; j <= 10; j += 2) { 407 l_name[*idx] = slotptr->name5_10[j]; 408 if (l_name[*idx] == 0x00) return 1; 409 (*idx)++; 410 } 411 for (j = 0; j <= 2; j += 2) { 412 l_name[*idx] = slotptr->name11_12[j]; 413 if (l_name[*idx] == 0x00) return 1; 414 (*idx)++; 415 } 416 417 return 0; 418 } 419 420 421 /* 422 * Extract the full long filename starting at 'retdent' (which is really 423 * a slot) into 'l_name'. If successful also copy the real directory entry 424 * into 'retdent' 425 * Return 0 on success, -1 otherwise. 426 */ 427 __u8 get_vfatname_block[MAX_CLUSTSIZE]; 428 static int 429 get_vfatname(fsdata *mydata, int curclust, __u8 *cluster, 430 dir_entry *retdent, char *l_name) 431 { 432 dir_entry *realdent; 433 dir_slot *slotptr = (dir_slot*) retdent; 434 __u8 *nextclust = cluster + mydata->clust_size * SECTOR_SIZE; 435 __u8 counter = slotptr->id & 0xf; 436 int idx = 0; 437 438 while ((__u8*)slotptr < nextclust) { 439 if (counter == 0) break; 440 if ((slotptr->id & 0x0f) != counter) return -1; 441 slotptr++; 442 counter--; 443 } 444 445 if ((__u8*)slotptr >= nextclust) { 446 dir_slot *slotptr2; 447 448 slotptr--; 449 curclust = get_fatent(mydata, curclust); 450 if (curclust <= 0x0001 || curclust >= 0xfff0) { 451 FAT_DPRINT("curclust: 0x%x\n", curclust); 452 FAT_ERROR("Invalid FAT entry\n"); 453 return -1; 454 } 455 if (get_cluster(mydata, curclust, get_vfatname_block, 456 mydata->clust_size * SECTOR_SIZE) != 0) { 457 FAT_DPRINT("Error: reading directory block\n"); 458 return -1; 459 } 460 slotptr2 = (dir_slot*) get_vfatname_block; 461 while (slotptr2->id > 0x01) { 462 slotptr2++; 463 } 464 /* Save the real directory entry */ 465 realdent = (dir_entry*)slotptr2 + 1; 466 while ((__u8*)slotptr2 >= get_vfatname_block) { 467 slot2str(slotptr2, l_name, &idx); 468 slotptr2--; 469 } 470 } else { 471 /* Save the real directory entry */ 472 realdent = (dir_entry*)slotptr; 473 } 474 475 do { 476 slotptr--; 477 if (slot2str(slotptr, l_name, &idx)) break; 478 } while (!(slotptr->id & 0x40)); 479 480 l_name[idx] = '\0'; 481 if (*l_name == DELETED_FLAG) *l_name = '\0'; 482 else if (*l_name == aRING) *l_name = '�'; 483 downcase(l_name); 484 485 /* Return the real directory entry */ 486 memcpy(retdent, realdent, sizeof(dir_entry)); 487 488 return 0; 489 } 490 491 492 /* Calculate short name checksum */ 493 static __u8 494 mkcksum(const char *str) 495 { 496 int i; 497 __u8 ret = 0; 498 499 for (i = 0; i < 11; i++) { 500 ret = (((ret&1)<<7)|((ret&0xfe)>>1)) + str[i]; 501 } 502 503 return ret; 504 } 505 #endif 506 507 508 /* 509 * Get the directory entry associated with 'filename' from the directory 510 * starting at 'startsect' 511 */ 512 __u8 get_dentfromdir_block[MAX_CLUSTSIZE]; 513 static dir_entry *get_dentfromdir (fsdata * mydata, int startsect, 514 char *filename, dir_entry * retdent, 515 int dols) 516 { 517 __u16 prevcksum = 0xffff; 518 __u32 curclust = START (retdent); 519 int files = 0, dirs = 0; 520 521 FAT_DPRINT ("get_dentfromdir: %s\n", filename); 522 while (1) { 523 dir_entry *dentptr; 524 int i; 525 526 if (get_cluster (mydata, curclust, get_dentfromdir_block, 527 mydata->clust_size * SECTOR_SIZE) != 0) { 528 FAT_DPRINT ("Error: reading directory block\n"); 529 return NULL; 530 } 531 dentptr = (dir_entry *) get_dentfromdir_block; 532 for (i = 0; i < DIRENTSPERCLUST; i++) { 533 char s_name[14], l_name[256]; 534 535 l_name[0] = '\0'; 536 if ((dentptr->attr & ATTR_VOLUME)) { 537 #ifdef CONFIG_SUPPORT_VFAT 538 if ((dentptr->attr & ATTR_VFAT) && 539 (dentptr->name[0] & 0x40)) { 540 prevcksum = ((dir_slot *) dentptr) 541 ->alias_checksum; 542 get_vfatname (mydata, curclust, get_dentfromdir_block, 543 dentptr, l_name); 544 if (dols) { 545 int isdir = (dentptr->attr & ATTR_DIR); 546 char dirc; 547 int doit = 0; 548 549 if (isdir) { 550 dirs++; 551 dirc = '/'; 552 doit = 1; 553 } else { 554 dirc = ' '; 555 if (l_name[0] != 0) { 556 files++; 557 doit = 1; 558 } 559 } 560 if (doit) { 561 if (dirc == ' ') { 562 printf (" %8ld %s%c\n", 563 (long) FAT2CPU32 (dentptr->size), 564 l_name, dirc); 565 } else { 566 printf (" %s%c\n", l_name, dirc); 567 } 568 } 569 dentptr++; 570 continue; 571 } 572 FAT_DPRINT ("vfatname: |%s|\n", l_name); 573 } else 574 #endif 575 { 576 /* Volume label or VFAT entry */ 577 dentptr++; 578 continue; 579 } 580 } 581 if (dentptr->name[0] == 0) { 582 if (dols) { 583 printf ("\n%d file(s), %d dir(s)\n\n", files, dirs); 584 } 585 FAT_DPRINT ("Dentname == NULL - %d\n", i); 586 return NULL; 587 } 588 #ifdef CONFIG_SUPPORT_VFAT 589 if (dols && mkcksum (dentptr->name) == prevcksum) { 590 dentptr++; 591 continue; 592 } 593 #endif 594 get_name (dentptr, s_name); 595 if (dols) { 596 int isdir = (dentptr->attr & ATTR_DIR); 597 char dirc; 598 int doit = 0; 599 600 if (isdir) { 601 dirs++; 602 dirc = '/'; 603 doit = 1; 604 } else { 605 dirc = ' '; 606 if (s_name[0] != 0) { 607 files++; 608 doit = 1; 609 } 610 } 611 if (doit) { 612 if (dirc == ' ') { 613 printf (" %8ld %s%c\n", 614 (long) FAT2CPU32 (dentptr->size), s_name, 615 dirc); 616 } else { 617 printf (" %s%c\n", s_name, dirc); 618 } 619 } 620 dentptr++; 621 continue; 622 } 623 if (strcmp (filename, s_name) && strcmp (filename, l_name)) { 624 FAT_DPRINT ("Mismatch: |%s|%s|\n", s_name, l_name); 625 dentptr++; 626 continue; 627 } 628 memcpy (retdent, dentptr, sizeof (dir_entry)); 629 630 FAT_DPRINT ("DentName: %s", s_name); 631 FAT_DPRINT (", start: 0x%x", START (dentptr)); 632 FAT_DPRINT (", size: 0x%x %s\n", 633 FAT2CPU32 (dentptr->size), 634 (dentptr->attr & ATTR_DIR) ? "(DIR)" : ""); 635 636 return retdent; 637 } 638 curclust = get_fatent (mydata, curclust); 639 if (curclust <= 0x0001 || curclust >= 0xfff0) { 640 FAT_DPRINT ("curclust: 0x%x\n", curclust); 641 FAT_ERROR ("Invalid FAT entry\n"); 642 return NULL; 643 } 644 } 645 646 return NULL; 647 } 648 649 650 /* 651 * Read boot sector and volume info from a FAT filesystem 652 */ 653 static int 654 read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize) 655 { 656 __u8 block[FS_BLOCK_SIZE]; 657 volume_info *vistart; 658 659 if (disk_read(0, 1, block) < 0) { 660 FAT_DPRINT("Error: reading block\n"); 661 return -1; 662 } 663 664 memcpy(bs, block, sizeof(boot_sector)); 665 bs->reserved = FAT2CPU16(bs->reserved); 666 bs->fat_length = FAT2CPU16(bs->fat_length); 667 bs->secs_track = FAT2CPU16(bs->secs_track); 668 bs->heads = FAT2CPU16(bs->heads); 669 #if 0 /* UNUSED */ 670 bs->hidden = FAT2CPU32(bs->hidden); 671 #endif 672 bs->total_sect = FAT2CPU32(bs->total_sect); 673 674 /* FAT32 entries */ 675 if (bs->fat_length == 0) { 676 /* Assume FAT32 */ 677 bs->fat32_length = FAT2CPU32(bs->fat32_length); 678 bs->flags = FAT2CPU16(bs->flags); 679 bs->root_cluster = FAT2CPU32(bs->root_cluster); 680 bs->info_sector = FAT2CPU16(bs->info_sector); 681 bs->backup_boot = FAT2CPU16(bs->backup_boot); 682 vistart = (volume_info*) (block + sizeof(boot_sector)); 683 *fatsize = 32; 684 } else { 685 vistart = (volume_info*) &(bs->fat32_length); 686 *fatsize = 0; 687 } 688 memcpy(volinfo, vistart, sizeof(volume_info)); 689 690 /* Terminate fs_type string. Writing past the end of vistart 691 is ok - it's just the buffer. */ 692 vistart->fs_type[8] = '\0'; 693 694 if (*fatsize == 32) { 695 if (compare_sign(FAT32_SIGN, vistart->fs_type) == 0) { 696 return 0; 697 } 698 } else { 699 if (compare_sign(FAT12_SIGN, vistart->fs_type) == 0) { 700 *fatsize = 12; 701 return 0; 702 } 703 if (compare_sign(FAT16_SIGN, vistart->fs_type) == 0) { 704 *fatsize = 16; 705 return 0; 706 } 707 } 708 709 FAT_DPRINT("Error: broken fs_type sign\n"); 710 return -1; 711 } 712 713 714 __u8 do_fat_read_block[MAX_CLUSTSIZE]; /* Block buffer */ 715 static long 716 do_fat_read (const char *filename, void *buffer, unsigned long maxsize, 717 int dols) 718 { 719 char fnamecopy[2048]; 720 boot_sector bs; 721 volume_info volinfo; 722 fsdata datablock; 723 fsdata *mydata = &datablock; 724 dir_entry *dentptr; 725 __u16 prevcksum = 0xffff; 726 char *subname = ""; 727 int rootdir_size, cursect; 728 int idx, isdir = 0; 729 int files = 0, dirs = 0; 730 long ret = 0; 731 int firsttime; 732 733 if (read_bootsectandvi (&bs, &volinfo, &mydata->fatsize)) { 734 FAT_DPRINT ("Error: reading boot sector\n"); 735 return -1; 736 } 737 if (mydata->fatsize == 32) { 738 mydata->fatlength = bs.fat32_length; 739 } else { 740 mydata->fatlength = bs.fat_length; 741 } 742 mydata->fat_sect = bs.reserved; 743 cursect = mydata->rootdir_sect 744 = mydata->fat_sect + mydata->fatlength * bs.fats; 745 mydata->clust_size = bs.cluster_size; 746 if (mydata->fatsize == 32) { 747 rootdir_size = mydata->clust_size; 748 mydata->data_begin = mydata->rootdir_sect /* + rootdir_size */ 749 - (mydata->clust_size * 2); 750 } else { 751 rootdir_size = ((bs.dir_entries[1] * (int) 256 + bs.dir_entries[0]) 752 * sizeof (dir_entry)) / SECTOR_SIZE; 753 mydata->data_begin = mydata->rootdir_sect + rootdir_size 754 - (mydata->clust_size * 2); 755 } 756 mydata->fatbufnum = -1; 757 758 FAT_DPRINT ("FAT%d, fatlength: %d\n", mydata->fatsize, 759 mydata->fatlength); 760 FAT_DPRINT ("Rootdir begins at sector: %d, offset: %x, size: %d\n" 761 "Data begins at: %d\n", 762 mydata->rootdir_sect, mydata->rootdir_sect * SECTOR_SIZE, 763 rootdir_size, mydata->data_begin); 764 FAT_DPRINT ("Cluster size: %d\n", mydata->clust_size); 765 766 /* "cwd" is always the root... */ 767 while (ISDIRDELIM (*filename)) 768 filename++; 769 /* Make a copy of the filename and convert it to lowercase */ 770 strcpy (fnamecopy, filename); 771 downcase (fnamecopy); 772 if (*fnamecopy == '\0') { 773 if (!dols) 774 return -1; 775 dols = LS_ROOT; 776 } else if ((idx = dirdelim (fnamecopy)) >= 0) { 777 isdir = 1; 778 fnamecopy[idx] = '\0'; 779 subname = fnamecopy + idx + 1; 780 /* Handle multiple delimiters */ 781 while (ISDIRDELIM (*subname)) 782 subname++; 783 } else if (dols) { 784 isdir = 1; 785 } 786 787 while (1) { 788 int i; 789 790 if (disk_read (cursect, mydata->clust_size, do_fat_read_block) < 0) { 791 FAT_DPRINT ("Error: reading rootdir block\n"); 792 return -1; 793 } 794 dentptr = (dir_entry *) do_fat_read_block; 795 for (i = 0; i < DIRENTSPERBLOCK; i++) { 796 char s_name[14], l_name[256]; 797 798 l_name[0] = '\0'; 799 if ((dentptr->attr & ATTR_VOLUME)) { 800 #ifdef CONFIG_SUPPORT_VFAT 801 if ((dentptr->attr & ATTR_VFAT) && 802 (dentptr->name[0] & 0x40)) { 803 prevcksum = ((dir_slot *) dentptr)->alias_checksum; 804 get_vfatname (mydata, 0, do_fat_read_block, dentptr, l_name); 805 if (dols == LS_ROOT) { 806 int isdir = (dentptr->attr & ATTR_DIR); 807 char dirc; 808 int doit = 0; 809 810 if (isdir) { 811 dirs++; 812 dirc = '/'; 813 doit = 1; 814 } else { 815 dirc = ' '; 816 if (l_name[0] != 0) { 817 files++; 818 doit = 1; 819 } 820 } 821 if (doit) { 822 if (dirc == ' ') { 823 printf (" %8ld %s%c\n", 824 (long) FAT2CPU32 (dentptr->size), 825 l_name, dirc); 826 } else { 827 printf (" %s%c\n", l_name, dirc); 828 } 829 } 830 dentptr++; 831 continue; 832 } 833 FAT_DPRINT ("Rootvfatname: |%s|\n", l_name); 834 } else 835 #endif 836 { 837 /* Volume label or VFAT entry */ 838 dentptr++; 839 continue; 840 } 841 } else if (dentptr->name[0] == 0) { 842 FAT_DPRINT ("RootDentname == NULL - %d\n", i); 843 if (dols == LS_ROOT) { 844 printf ("\n%d file(s), %d dir(s)\n\n", files, dirs); 845 return 0; 846 } 847 return -1; 848 } 849 #ifdef CONFIG_SUPPORT_VFAT 850 else if (dols == LS_ROOT 851 && mkcksum (dentptr->name) == prevcksum) { 852 dentptr++; 853 continue; 854 } 855 #endif 856 get_name (dentptr, s_name); 857 if (dols == LS_ROOT) { 858 int isdir = (dentptr->attr & ATTR_DIR); 859 char dirc; 860 int doit = 0; 861 862 if (isdir) { 863 dirc = '/'; 864 if (s_name[0] != 0) { 865 dirs++; 866 doit = 1; 867 } 868 } else { 869 dirc = ' '; 870 if (s_name[0] != 0) { 871 files++; 872 doit = 1; 873 } 874 } 875 if (doit) { 876 if (dirc == ' ') { 877 printf (" %8ld %s%c\n", 878 (long) FAT2CPU32 (dentptr->size), s_name, 879 dirc); 880 } else { 881 printf (" %s%c\n", s_name, dirc); 882 } 883 } 884 dentptr++; 885 continue; 886 } 887 if (strcmp (fnamecopy, s_name) && strcmp (fnamecopy, l_name)) { 888 FAT_DPRINT ("RootMismatch: |%s|%s|\n", s_name, l_name); 889 dentptr++; 890 continue; 891 } 892 if (isdir && !(dentptr->attr & ATTR_DIR)) 893 return -1; 894 895 FAT_DPRINT ("RootName: %s", s_name); 896 FAT_DPRINT (", start: 0x%x", START (dentptr)); 897 FAT_DPRINT (", size: 0x%x %s\n", 898 FAT2CPU32 (dentptr->size), isdir ? "(DIR)" : ""); 899 900 goto rootdir_done; /* We got a match */ 901 } 902 cursect++; 903 } 904 rootdir_done: 905 906 firsttime = 1; 907 while (isdir) { 908 int startsect = mydata->data_begin 909 + START (dentptr) * mydata->clust_size; 910 dir_entry dent; 911 char *nextname = NULL; 912 913 dent = *dentptr; 914 dentptr = &dent; 915 916 idx = dirdelim (subname); 917 if (idx >= 0) { 918 subname[idx] = '\0'; 919 nextname = subname + idx + 1; 920 /* Handle multiple delimiters */ 921 while (ISDIRDELIM (*nextname)) 922 nextname++; 923 if (dols && *nextname == '\0') 924 firsttime = 0; 925 } else { 926 if (dols && firsttime) { 927 firsttime = 0; 928 } else { 929 isdir = 0; 930 } 931 } 932 933 if (get_dentfromdir (mydata, startsect, subname, dentptr, 934 isdir ? 0 : dols) == NULL) { 935 if (dols && !isdir) 936 return 0; 937 return -1; 938 } 939 940 if (idx >= 0) { 941 if (!(dentptr->attr & ATTR_DIR)) 942 return -1; 943 subname = nextname; 944 } 945 } 946 ret = get_contents (mydata, dentptr, buffer, maxsize); 947 FAT_DPRINT ("Size: %d, got: %ld\n", FAT2CPU32 (dentptr->size), ret); 948 949 return ret; 950 } 951 952 953 int 954 file_fat_detectfs(void) 955 { 956 boot_sector bs; 957 volume_info volinfo; 958 int fatsize; 959 char vol_label[12]; 960 961 if(cur_dev==NULL) { 962 printf("No current device\n"); 963 return 1; 964 } 965 #if (CONFIG_COMMANDS & CFG_CMD_IDE) || (CONFIG_COMMANDS & CFG_CMD_SCSI) || \ 966 (CONFIG_COMMANDS & CFG_CMD_USB) || (CONFIG_MMC) 967 printf("Interface: "); 968 switch(cur_dev->if_type) { 969 case IF_TYPE_IDE : printf("IDE"); break; 970 case IF_TYPE_SCSI : printf("SCSI"); break; 971 case IF_TYPE_ATAPI : printf("ATAPI"); break; 972 case IF_TYPE_USB : printf("USB"); break; 973 case IF_TYPE_DOC : printf("DOC"); break; 974 case IF_TYPE_MMC : printf("MMC"); break; 975 default : printf("Unknown"); 976 } 977 printf("\n Device %d: ",cur_dev->dev); 978 dev_print(cur_dev); 979 #endif 980 if(read_bootsectandvi(&bs, &volinfo, &fatsize)) { 981 printf("\nNo valid FAT fs found\n"); 982 return 1; 983 } 984 memcpy (vol_label, volinfo.volume_label, 11); 985 vol_label[11] = '\0'; 986 volinfo.fs_type[5]='\0'; 987 printf("Partition %d: Filesystem: %s \"%s\"\n",cur_part,volinfo.fs_type,vol_label); 988 return 0; 989 } 990 991 992 int 993 file_fat_ls(const char *dir) 994 { 995 return do_fat_read(dir, NULL, 0, LS_YES); 996 } 997 998 999 long 1000 file_fat_read(const char *filename, void *buffer, unsigned long maxsize) 1001 { 1002 printf("reading %s\n",filename); 1003 return do_fat_read(filename, buffer, maxsize, LS_NO); 1004 } 1005 1006 #endif /* #if (CONFIG_COMMANDS & CFG_CMD_FAT) */ 1007