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 defined(CONFIG_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 63 , startblock, getsize, (unsigned long *)bufptr); 64 } 65 return -1; 66 } 67 68 69 int 70 fat_register_device(block_dev_desc_t *dev_desc, int part_no) 71 { 72 unsigned char buffer[SECTOR_SIZE]; 73 disk_partition_t info; 74 75 if (!dev_desc->block_read) 76 return -1; 77 cur_dev = dev_desc; 78 /* check if we have a MBR (on floppies we have only a PBR) */ 79 if (dev_desc->block_read (dev_desc->dev, 0, 1, (ulong *) buffer) != 1) { 80 printf ("** Can't read from device %d **\n", dev_desc->dev); 81 return -1; 82 } 83 if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 || 84 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) { 85 /* no signature found */ 86 return -1; 87 } 88 #if (defined(CONFIG_CMD_IDE) || \ 89 defined(CONFIG_CMD_SCSI) || \ 90 defined(CONFIG_CMD_USB) || \ 91 defined(CONFIG_MMC) || \ 92 defined(CONFIG_SYSTEMACE) ) 93 /* First we assume, there is a MBR */ 94 if (!get_partition_info (dev_desc, part_no, &info)) { 95 part_offset = info.start; 96 cur_part = part_no; 97 } else if (!strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET], "FAT", 3)) { 98 /* ok, we assume we are on a PBR only */ 99 cur_part = 1; 100 part_offset = 0; 101 } else { 102 printf ("** Partition %d not valid on device %d **\n", 103 part_no, dev_desc->dev); 104 return -1; 105 } 106 107 #else 108 if (!strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET],"FAT",3)) { 109 /* ok, we assume we are on a PBR only */ 110 cur_part = 1; 111 part_offset = 0; 112 info.start = part_offset; 113 } else { 114 /* FIXME we need to determine the start block of the 115 * partition where the DOS FS resides. This can be done 116 * by using the get_partition_info routine. For this 117 * purpose the libpart must be included. 118 */ 119 part_offset = 32; 120 cur_part = 1; 121 } 122 #endif 123 return 0; 124 } 125 126 127 /* 128 * Get the first occurence of a directory delimiter ('/' or '\') in a string. 129 * Return index into string if found, -1 otherwise. 130 */ 131 static int 132 dirdelim(char *str) 133 { 134 char *start = str; 135 136 while (*str != '\0') { 137 if (ISDIRDELIM(*str)) return str - start; 138 str++; 139 } 140 return -1; 141 } 142 143 144 /* 145 * Match volume_info fs_type strings. 146 * Return 0 on match, -1 otherwise. 147 */ 148 static int 149 compare_sign(char *str1, char *str2) 150 { 151 char *end = str1+SIGNLEN; 152 153 while (str1 != end) { 154 if (*str1 != *str2) { 155 return -1; 156 } 157 str1++; 158 str2++; 159 } 160 161 return 0; 162 } 163 164 165 /* 166 * Extract zero terminated short name from a directory entry. 167 */ 168 static void get_name (dir_entry *dirent, char *s_name) 169 { 170 char *ptr; 171 172 memcpy (s_name, dirent->name, 8); 173 s_name[8] = '\0'; 174 ptr = s_name; 175 while (*ptr && *ptr != ' ') 176 ptr++; 177 if (dirent->ext[0] && dirent->ext[0] != ' ') { 178 *ptr = '.'; 179 ptr++; 180 memcpy (ptr, dirent->ext, 3); 181 ptr[3] = '\0'; 182 while (*ptr && *ptr != ' ') 183 ptr++; 184 } 185 *ptr = '\0'; 186 if (*s_name == DELETED_FLAG) 187 *s_name = '\0'; 188 else if (*s_name == aRING) 189 *s_name = '�'; 190 downcase (s_name); 191 } 192 193 /* 194 * Get the entry at index 'entry' in a FAT (12/16/32) table. 195 * On failure 0x00 is returned. 196 */ 197 static __u32 198 get_fatent(fsdata *mydata, __u32 entry) 199 { 200 __u32 bufnum; 201 __u32 offset; 202 __u32 ret = 0x00; 203 204 switch (mydata->fatsize) { 205 case 32: 206 bufnum = entry / FAT32BUFSIZE; 207 offset = entry - bufnum * FAT32BUFSIZE; 208 break; 209 case 16: 210 bufnum = entry / FAT16BUFSIZE; 211 offset = entry - bufnum * FAT16BUFSIZE; 212 break; 213 case 12: 214 bufnum = entry / FAT12BUFSIZE; 215 offset = entry - bufnum * FAT12BUFSIZE; 216 break; 217 218 default: 219 /* Unsupported FAT size */ 220 return ret; 221 } 222 223 /* Read a new block of FAT entries into the cache. */ 224 if (bufnum != mydata->fatbufnum) { 225 int getsize = FATBUFSIZE/FS_BLOCK_SIZE; 226 __u8 *bufptr = mydata->fatbuf; 227 __u32 fatlength = mydata->fatlength; 228 __u32 startblock = bufnum * FATBUFBLOCKS; 229 230 fatlength *= SECTOR_SIZE; /* We want it in bytes now */ 231 startblock += mydata->fat_sect; /* Offset from start of disk */ 232 233 if (getsize > fatlength) getsize = fatlength; 234 if (disk_read(startblock, getsize, bufptr) < 0) { 235 FAT_DPRINT("Error reading FAT blocks\n"); 236 return ret; 237 } 238 mydata->fatbufnum = bufnum; 239 } 240 241 /* Get the actual entry from the table */ 242 switch (mydata->fatsize) { 243 case 32: 244 ret = FAT2CPU32(((__u32*)mydata->fatbuf)[offset]); 245 break; 246 case 16: 247 ret = FAT2CPU16(((__u16*)mydata->fatbuf)[offset]); 248 break; 249 case 12: { 250 __u32 off16 = (offset*3)/4; 251 __u16 val1, val2; 252 253 switch (offset & 0x3) { 254 case 0: 255 ret = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]); 256 ret &= 0xfff; 257 break; 258 case 1: 259 val1 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]); 260 val1 &= 0xf000; 261 val2 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16+1]); 262 val2 &= 0x00ff; 263 ret = (val2 << 4) | (val1 >> 12); 264 break; 265 case 2: 266 val1 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]); 267 val1 &= 0xff00; 268 val2 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16+1]); 269 val2 &= 0x000f; 270 ret = (val2 << 8) | (val1 >> 8); 271 break; 272 case 3: 273 ret = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);; 274 ret = (ret & 0xfff0) >> 4; 275 break; 276 default: 277 break; 278 } 279 } 280 break; 281 } 282 FAT_DPRINT("ret: %d, offset: %d\n", ret, offset); 283 284 return ret; 285 } 286 287 288 /* 289 * Read at most 'size' bytes from the specified cluster into 'buffer'. 290 * Return 0 on success, -1 otherwise. 291 */ 292 static int 293 get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size) 294 { 295 int idx = 0; 296 __u32 startsect; 297 298 if (clustnum > 0) { 299 startsect = mydata->data_begin + clustnum*mydata->clust_size; 300 } else { 301 startsect = mydata->rootdir_sect; 302 } 303 304 FAT_DPRINT("gc - clustnum: %d, startsect: %d\n", clustnum, startsect); 305 if (disk_read(startsect, size/FS_BLOCK_SIZE , buffer) < 0) { 306 FAT_DPRINT("Error reading data\n"); 307 return -1; 308 } 309 if(size % FS_BLOCK_SIZE) { 310 __u8 tmpbuf[FS_BLOCK_SIZE]; 311 idx= size/FS_BLOCK_SIZE; 312 if (disk_read(startsect + idx, 1, tmpbuf) < 0) { 313 FAT_DPRINT("Error reading data\n"); 314 return -1; 315 } 316 buffer += idx*FS_BLOCK_SIZE; 317 318 memcpy(buffer, tmpbuf, size % FS_BLOCK_SIZE); 319 return 0; 320 } 321 322 return 0; 323 } 324 325 326 /* 327 * Read at most 'maxsize' bytes from the file associated with 'dentptr' 328 * into 'buffer'. 329 * Return the number of bytes read or -1 on fatal errors. 330 */ 331 static long 332 get_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer, 333 unsigned long maxsize) 334 { 335 unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0; 336 unsigned int bytesperclust = mydata->clust_size * SECTOR_SIZE; 337 __u32 curclust = START(dentptr); 338 __u32 endclust, newclust; 339 unsigned long actsize; 340 341 FAT_DPRINT("Filesize: %ld bytes\n", filesize); 342 343 if (maxsize > 0 && filesize > maxsize) filesize = maxsize; 344 345 FAT_DPRINT("Reading: %ld bytes\n", filesize); 346 347 actsize=bytesperclust; 348 endclust=curclust; 349 do { 350 /* search for consecutive clusters */ 351 while(actsize < filesize) { 352 newclust = get_fatent(mydata, endclust); 353 if((newclust -1)!=endclust) 354 goto getit; 355 if (CHECK_CLUST(newclust, mydata->fatsize)) { 356 FAT_DPRINT("curclust: 0x%x\n", newclust); 357 FAT_DPRINT("Invalid FAT entry\n"); 358 return gotsize; 359 } 360 endclust=newclust; 361 actsize+= bytesperclust; 362 } 363 /* actsize >= file size */ 364 actsize -= bytesperclust; 365 /* get remaining clusters */ 366 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 367 FAT_ERROR("Error reading cluster\n"); 368 return -1; 369 } 370 /* get remaining bytes */ 371 gotsize += (int)actsize; 372 filesize -= actsize; 373 buffer += actsize; 374 actsize= filesize; 375 if (get_cluster(mydata, endclust, buffer, (int)actsize) != 0) { 376 FAT_ERROR("Error reading cluster\n"); 377 return -1; 378 } 379 gotsize+=actsize; 380 return gotsize; 381 getit: 382 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 383 FAT_ERROR("Error reading cluster\n"); 384 return -1; 385 } 386 gotsize += (int)actsize; 387 filesize -= actsize; 388 buffer += actsize; 389 curclust = get_fatent(mydata, endclust); 390 if (CHECK_CLUST(curclust, mydata->fatsize)) { 391 FAT_DPRINT("curclust: 0x%x\n", curclust); 392 FAT_ERROR("Invalid FAT entry\n"); 393 return gotsize; 394 } 395 actsize=bytesperclust; 396 endclust=curclust; 397 } while (1); 398 } 399 400 401 #ifdef CONFIG_SUPPORT_VFAT 402 /* 403 * Extract the file name information from 'slotptr' into 'l_name', 404 * starting at l_name[*idx]. 405 * Return 1 if terminator (zero byte) is found, 0 otherwise. 406 */ 407 static int 408 slot2str(dir_slot *slotptr, char *l_name, int *idx) 409 { 410 int j; 411 412 for (j = 0; j <= 8; j += 2) { 413 l_name[*idx] = slotptr->name0_4[j]; 414 if (l_name[*idx] == 0x00) return 1; 415 (*idx)++; 416 } 417 for (j = 0; j <= 10; j += 2) { 418 l_name[*idx] = slotptr->name5_10[j]; 419 if (l_name[*idx] == 0x00) return 1; 420 (*idx)++; 421 } 422 for (j = 0; j <= 2; j += 2) { 423 l_name[*idx] = slotptr->name11_12[j]; 424 if (l_name[*idx] == 0x00) return 1; 425 (*idx)++; 426 } 427 428 return 0; 429 } 430 431 432 /* 433 * Extract the full long filename starting at 'retdent' (which is really 434 * a slot) into 'l_name'. If successful also copy the real directory entry 435 * into 'retdent' 436 * Return 0 on success, -1 otherwise. 437 */ 438 __u8 get_vfatname_block[MAX_CLUSTSIZE]; 439 static int 440 get_vfatname(fsdata *mydata, int curclust, __u8 *cluster, 441 dir_entry *retdent, char *l_name) 442 { 443 dir_entry *realdent; 444 dir_slot *slotptr = (dir_slot*) retdent; 445 __u8 *nextclust = cluster + mydata->clust_size * SECTOR_SIZE; 446 __u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff; 447 int idx = 0; 448 449 while ((__u8*)slotptr < nextclust) { 450 if (counter == 0) break; 451 if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter) 452 return -1; 453 slotptr++; 454 counter--; 455 } 456 457 if ((__u8*)slotptr >= nextclust) { 458 dir_slot *slotptr2; 459 460 slotptr--; 461 curclust = get_fatent(mydata, curclust); 462 if (CHECK_CLUST(curclust, mydata->fatsize)) { 463 FAT_DPRINT("curclust: 0x%x\n", curclust); 464 FAT_ERROR("Invalid FAT entry\n"); 465 return -1; 466 } 467 if (get_cluster(mydata, curclust, get_vfatname_block, 468 mydata->clust_size * SECTOR_SIZE) != 0) { 469 FAT_DPRINT("Error: reading directory block\n"); 470 return -1; 471 } 472 slotptr2 = (dir_slot*) get_vfatname_block; 473 while (slotptr2->id > 0x01) { 474 slotptr2++; 475 } 476 /* Save the real directory entry */ 477 realdent = (dir_entry*)slotptr2 + 1; 478 while ((__u8*)slotptr2 >= get_vfatname_block) { 479 slot2str(slotptr2, l_name, &idx); 480 slotptr2--; 481 } 482 } else { 483 /* Save the real directory entry */ 484 realdent = (dir_entry*)slotptr; 485 } 486 487 do { 488 slotptr--; 489 if (slot2str(slotptr, l_name, &idx)) break; 490 } while (!(slotptr->id & LAST_LONG_ENTRY_MASK)); 491 492 l_name[idx] = '\0'; 493 if (*l_name == DELETED_FLAG) *l_name = '\0'; 494 else if (*l_name == aRING) *l_name = '�'; 495 downcase(l_name); 496 497 /* Return the real directory entry */ 498 memcpy(retdent, realdent, sizeof(dir_entry)); 499 500 return 0; 501 } 502 503 504 /* Calculate short name checksum */ 505 static __u8 506 mkcksum(const char *str) 507 { 508 int i; 509 __u8 ret = 0; 510 511 for (i = 0; i < 11; i++) { 512 ret = (((ret&1)<<7)|((ret&0xfe)>>1)) + str[i]; 513 } 514 515 return ret; 516 } 517 #endif 518 519 520 /* 521 * Get the directory entry associated with 'filename' from the directory 522 * starting at 'startsect' 523 */ 524 __u8 get_dentfromdir_block[MAX_CLUSTSIZE]; 525 static dir_entry *get_dentfromdir (fsdata * mydata, int startsect, 526 char *filename, dir_entry * retdent, 527 int dols) 528 { 529 __u16 prevcksum = 0xffff; 530 __u32 curclust = START (retdent); 531 int files = 0, dirs = 0; 532 533 FAT_DPRINT ("get_dentfromdir: %s\n", filename); 534 while (1) { 535 dir_entry *dentptr; 536 int i; 537 538 if (get_cluster (mydata, curclust, get_dentfromdir_block, 539 mydata->clust_size * SECTOR_SIZE) != 0) { 540 FAT_DPRINT ("Error: reading directory block\n"); 541 return NULL; 542 } 543 dentptr = (dir_entry *) get_dentfromdir_block; 544 for (i = 0; i < DIRENTSPERCLUST; i++) { 545 char s_name[14], l_name[256]; 546 547 l_name[0] = '\0'; 548 if (dentptr->name[0] == DELETED_FLAG) { 549 dentptr++; 550 continue; 551 } 552 if ((dentptr->attr & ATTR_VOLUME)) { 553 #ifdef CONFIG_SUPPORT_VFAT 554 if ((dentptr->attr & ATTR_VFAT) && 555 (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) { 556 prevcksum = ((dir_slot *) dentptr) 557 ->alias_checksum; 558 get_vfatname (mydata, curclust, get_dentfromdir_block, 559 dentptr, l_name); 560 if (dols) { 561 int isdir = (dentptr->attr & ATTR_DIR); 562 char dirc; 563 int doit = 0; 564 565 if (isdir) { 566 dirs++; 567 dirc = '/'; 568 doit = 1; 569 } else { 570 dirc = ' '; 571 if (l_name[0] != 0) { 572 files++; 573 doit = 1; 574 } 575 } 576 if (doit) { 577 if (dirc == ' ') { 578 printf (" %8ld %s%c\n", 579 (long) FAT2CPU32 (dentptr->size), 580 l_name, dirc); 581 } else { 582 printf (" %s%c\n", l_name, dirc); 583 } 584 } 585 dentptr++; 586 continue; 587 } 588 FAT_DPRINT ("vfatname: |%s|\n", l_name); 589 } else 590 #endif 591 { 592 /* Volume label or VFAT entry */ 593 dentptr++; 594 continue; 595 } 596 } 597 if (dentptr->name[0] == 0) { 598 if (dols) { 599 printf ("\n%d file(s), %d dir(s)\n\n", files, dirs); 600 } 601 FAT_DPRINT ("Dentname == NULL - %d\n", i); 602 return NULL; 603 } 604 #ifdef CONFIG_SUPPORT_VFAT 605 if (dols && mkcksum (dentptr->name) == prevcksum) { 606 dentptr++; 607 continue; 608 } 609 #endif 610 get_name (dentptr, s_name); 611 if (dols) { 612 int isdir = (dentptr->attr & ATTR_DIR); 613 char dirc; 614 int doit = 0; 615 616 if (isdir) { 617 dirs++; 618 dirc = '/'; 619 doit = 1; 620 } else { 621 dirc = ' '; 622 if (s_name[0] != 0) { 623 files++; 624 doit = 1; 625 } 626 } 627 if (doit) { 628 if (dirc == ' ') { 629 printf (" %8ld %s%c\n", 630 (long) FAT2CPU32 (dentptr->size), s_name, 631 dirc); 632 } else { 633 printf (" %s%c\n", s_name, dirc); 634 } 635 } 636 dentptr++; 637 continue; 638 } 639 if (strcmp (filename, s_name) && strcmp (filename, l_name)) { 640 FAT_DPRINT ("Mismatch: |%s|%s|\n", s_name, l_name); 641 dentptr++; 642 continue; 643 } 644 memcpy (retdent, dentptr, sizeof (dir_entry)); 645 646 FAT_DPRINT ("DentName: %s", s_name); 647 FAT_DPRINT (", start: 0x%x", START (dentptr)); 648 FAT_DPRINT (", size: 0x%x %s\n", 649 FAT2CPU32 (dentptr->size), 650 (dentptr->attr & ATTR_DIR) ? "(DIR)" : ""); 651 652 return retdent; 653 } 654 curclust = get_fatent (mydata, curclust); 655 if (CHECK_CLUST(curclust, mydata->fatsize)) { 656 FAT_DPRINT ("curclust: 0x%x\n", curclust); 657 FAT_ERROR ("Invalid FAT entry\n"); 658 return NULL; 659 } 660 } 661 662 return NULL; 663 } 664 665 666 /* 667 * Read boot sector and volume info from a FAT filesystem 668 */ 669 static int 670 read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize) 671 { 672 __u8 block[FS_BLOCK_SIZE]; 673 volume_info *vistart; 674 675 if (disk_read(0, 1, block) < 0) { 676 FAT_DPRINT("Error: reading block\n"); 677 return -1; 678 } 679 680 memcpy(bs, block, sizeof(boot_sector)); 681 bs->reserved = FAT2CPU16(bs->reserved); 682 bs->fat_length = FAT2CPU16(bs->fat_length); 683 bs->secs_track = FAT2CPU16(bs->secs_track); 684 bs->heads = FAT2CPU16(bs->heads); 685 #if 0 /* UNUSED */ 686 bs->hidden = FAT2CPU32(bs->hidden); 687 #endif 688 bs->total_sect = FAT2CPU32(bs->total_sect); 689 690 /* FAT32 entries */ 691 if (bs->fat_length == 0) { 692 /* Assume FAT32 */ 693 bs->fat32_length = FAT2CPU32(bs->fat32_length); 694 bs->flags = FAT2CPU16(bs->flags); 695 bs->root_cluster = FAT2CPU32(bs->root_cluster); 696 bs->info_sector = FAT2CPU16(bs->info_sector); 697 bs->backup_boot = FAT2CPU16(bs->backup_boot); 698 vistart = (volume_info*) (block + sizeof(boot_sector)); 699 *fatsize = 32; 700 } else { 701 vistart = (volume_info*) &(bs->fat32_length); 702 *fatsize = 0; 703 } 704 memcpy(volinfo, vistart, sizeof(volume_info)); 705 706 /* Terminate fs_type string. Writing past the end of vistart 707 is ok - it's just the buffer. */ 708 vistart->fs_type[8] = '\0'; 709 710 if (*fatsize == 32) { 711 if (compare_sign(FAT32_SIGN, vistart->fs_type) == 0) { 712 return 0; 713 } 714 } else { 715 if (compare_sign(FAT12_SIGN, vistart->fs_type) == 0) { 716 *fatsize = 12; 717 return 0; 718 } 719 if (compare_sign(FAT16_SIGN, vistart->fs_type) == 0) { 720 *fatsize = 16; 721 return 0; 722 } 723 } 724 725 FAT_DPRINT("Error: broken fs_type sign\n"); 726 return -1; 727 } 728 729 730 __u8 do_fat_read_block[MAX_CLUSTSIZE]; /* Block buffer */ 731 long 732 do_fat_read (const char *filename, void *buffer, unsigned long maxsize, 733 int dols) 734 { 735 #if CONFIG_NIOS /* NIOS CPU cannot access big automatic arrays */ 736 static 737 #endif 738 char fnamecopy[2048]; 739 boot_sector bs; 740 volume_info volinfo; 741 fsdata datablock; 742 fsdata *mydata = &datablock; 743 dir_entry *dentptr; 744 __u16 prevcksum = 0xffff; 745 char *subname = ""; 746 int rootdir_size, cursect; 747 int idx, isdir = 0; 748 int files = 0, dirs = 0; 749 long ret = 0; 750 int firsttime; 751 752 if (read_bootsectandvi (&bs, &volinfo, &mydata->fatsize)) { 753 FAT_DPRINT ("Error: reading boot sector\n"); 754 return -1; 755 } 756 if (mydata->fatsize == 32) { 757 mydata->fatlength = bs.fat32_length; 758 } else { 759 mydata->fatlength = bs.fat_length; 760 } 761 mydata->fat_sect = bs.reserved; 762 cursect = mydata->rootdir_sect 763 = mydata->fat_sect + mydata->fatlength * bs.fats; 764 mydata->clust_size = bs.cluster_size; 765 if (mydata->fatsize == 32) { 766 rootdir_size = mydata->clust_size; 767 mydata->data_begin = mydata->rootdir_sect /* + rootdir_size */ 768 - (mydata->clust_size * 2); 769 } else { 770 rootdir_size = ((bs.dir_entries[1] * (int) 256 + bs.dir_entries[0]) 771 * sizeof (dir_entry)) / SECTOR_SIZE; 772 mydata->data_begin = mydata->rootdir_sect + rootdir_size 773 - (mydata->clust_size * 2); 774 } 775 mydata->fatbufnum = -1; 776 777 FAT_DPRINT ("FAT%d, fatlength: %d\n", mydata->fatsize, 778 mydata->fatlength); 779 FAT_DPRINT ("Rootdir begins at sector: %d, offset: %x, size: %d\n" 780 "Data begins at: %d\n", 781 mydata->rootdir_sect, mydata->rootdir_sect * SECTOR_SIZE, 782 rootdir_size, mydata->data_begin); 783 FAT_DPRINT ("Cluster size: %d\n", mydata->clust_size); 784 785 /* "cwd" is always the root... */ 786 while (ISDIRDELIM (*filename)) 787 filename++; 788 /* Make a copy of the filename and convert it to lowercase */ 789 strcpy (fnamecopy, filename); 790 downcase (fnamecopy); 791 if (*fnamecopy == '\0') { 792 if (!dols) 793 return -1; 794 dols = LS_ROOT; 795 } else if ((idx = dirdelim (fnamecopy)) >= 0) { 796 isdir = 1; 797 fnamecopy[idx] = '\0'; 798 subname = fnamecopy + idx + 1; 799 /* Handle multiple delimiters */ 800 while (ISDIRDELIM (*subname)) 801 subname++; 802 } else if (dols) { 803 isdir = 1; 804 } 805 806 while (1) { 807 int i; 808 809 if (disk_read (cursect, mydata->clust_size, do_fat_read_block) < 0) { 810 FAT_DPRINT ("Error: reading rootdir block\n"); 811 return -1; 812 } 813 dentptr = (dir_entry *) do_fat_read_block; 814 for (i = 0; i < DIRENTSPERBLOCK; i++) { 815 char s_name[14], l_name[256]; 816 817 l_name[0] = '\0'; 818 if ((dentptr->attr & ATTR_VOLUME)) { 819 #ifdef CONFIG_SUPPORT_VFAT 820 if ((dentptr->attr & ATTR_VFAT) && 821 (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) { 822 prevcksum = ((dir_slot *) dentptr)->alias_checksum; 823 get_vfatname (mydata, 0, do_fat_read_block, dentptr, l_name); 824 if (dols == LS_ROOT) { 825 int isdir = (dentptr->attr & ATTR_DIR); 826 char dirc; 827 int doit = 0; 828 829 if (isdir) { 830 dirs++; 831 dirc = '/'; 832 doit = 1; 833 } else { 834 dirc = ' '; 835 if (l_name[0] != 0) { 836 files++; 837 doit = 1; 838 } 839 } 840 if (doit) { 841 if (dirc == ' ') { 842 printf (" %8ld %s%c\n", 843 (long) FAT2CPU32 (dentptr->size), 844 l_name, dirc); 845 } else { 846 printf (" %s%c\n", l_name, dirc); 847 } 848 } 849 dentptr++; 850 continue; 851 } 852 FAT_DPRINT ("Rootvfatname: |%s|\n", l_name); 853 } else 854 #endif 855 { 856 /* Volume label or VFAT entry */ 857 dentptr++; 858 continue; 859 } 860 } else if (dentptr->name[0] == 0) { 861 FAT_DPRINT ("RootDentname == NULL - %d\n", i); 862 if (dols == LS_ROOT) { 863 printf ("\n%d file(s), %d dir(s)\n\n", files, dirs); 864 return 0; 865 } 866 return -1; 867 } 868 #ifdef CONFIG_SUPPORT_VFAT 869 else if (dols == LS_ROOT 870 && mkcksum (dentptr->name) == prevcksum) { 871 dentptr++; 872 continue; 873 } 874 #endif 875 get_name (dentptr, s_name); 876 if (dols == LS_ROOT) { 877 int isdir = (dentptr->attr & ATTR_DIR); 878 char dirc; 879 int doit = 0; 880 881 if (isdir) { 882 dirc = '/'; 883 if (s_name[0] != 0) { 884 dirs++; 885 doit = 1; 886 } 887 } else { 888 dirc = ' '; 889 if (s_name[0] != 0) { 890 files++; 891 doit = 1; 892 } 893 } 894 if (doit) { 895 if (dirc == ' ') { 896 printf (" %8ld %s%c\n", 897 (long) FAT2CPU32 (dentptr->size), s_name, 898 dirc); 899 } else { 900 printf (" %s%c\n", s_name, dirc); 901 } 902 } 903 dentptr++; 904 continue; 905 } 906 if (strcmp (fnamecopy, s_name) && strcmp (fnamecopy, l_name)) { 907 FAT_DPRINT ("RootMismatch: |%s|%s|\n", s_name, l_name); 908 dentptr++; 909 continue; 910 } 911 if (isdir && !(dentptr->attr & ATTR_DIR)) 912 return -1; 913 914 FAT_DPRINT ("RootName: %s", s_name); 915 FAT_DPRINT (", start: 0x%x", START (dentptr)); 916 FAT_DPRINT (", size: 0x%x %s\n", 917 FAT2CPU32 (dentptr->size), isdir ? "(DIR)" : ""); 918 919 goto rootdir_done; /* We got a match */ 920 } 921 cursect++; 922 } 923 rootdir_done: 924 925 firsttime = 1; 926 while (isdir) { 927 int startsect = mydata->data_begin 928 + START (dentptr) * mydata->clust_size; 929 dir_entry dent; 930 char *nextname = NULL; 931 932 dent = *dentptr; 933 dentptr = &dent; 934 935 idx = dirdelim (subname); 936 if (idx >= 0) { 937 subname[idx] = '\0'; 938 nextname = subname + idx + 1; 939 /* Handle multiple delimiters */ 940 while (ISDIRDELIM (*nextname)) 941 nextname++; 942 if (dols && *nextname == '\0') 943 firsttime = 0; 944 } else { 945 if (dols && firsttime) { 946 firsttime = 0; 947 } else { 948 isdir = 0; 949 } 950 } 951 952 if (get_dentfromdir (mydata, startsect, subname, dentptr, 953 isdir ? 0 : dols) == NULL) { 954 if (dols && !isdir) 955 return 0; 956 return -1; 957 } 958 959 if (idx >= 0) { 960 if (!(dentptr->attr & ATTR_DIR)) 961 return -1; 962 subname = nextname; 963 } 964 } 965 ret = get_contents (mydata, dentptr, buffer, maxsize); 966 FAT_DPRINT ("Size: %d, got: %ld\n", FAT2CPU32 (dentptr->size), ret); 967 968 return ret; 969 } 970 971 972 int 973 file_fat_detectfs(void) 974 { 975 boot_sector bs; 976 volume_info volinfo; 977 int fatsize; 978 char vol_label[12]; 979 980 if(cur_dev==NULL) { 981 printf("No current device\n"); 982 return 1; 983 } 984 #if defined(CONFIG_CMD_IDE) || \ 985 defined(CONFIG_CMD_SCSI) || \ 986 defined(CONFIG_CMD_USB) || \ 987 defined(CONFIG_MMC) 988 printf("Interface: "); 989 switch(cur_dev->if_type) { 990 case IF_TYPE_IDE : printf("IDE"); break; 991 case IF_TYPE_SCSI : printf("SCSI"); break; 992 case IF_TYPE_ATAPI : printf("ATAPI"); break; 993 case IF_TYPE_USB : printf("USB"); break; 994 case IF_TYPE_DOC : printf("DOC"); break; 995 case IF_TYPE_MMC : printf("MMC"); break; 996 default : printf("Unknown"); 997 } 998 printf("\n Device %d: ",cur_dev->dev); 999 dev_print(cur_dev); 1000 #endif 1001 if(read_bootsectandvi(&bs, &volinfo, &fatsize)) { 1002 printf("\nNo valid FAT fs found\n"); 1003 return 1; 1004 } 1005 memcpy (vol_label, volinfo.volume_label, 11); 1006 vol_label[11] = '\0'; 1007 volinfo.fs_type[5]='\0'; 1008 printf("Partition %d: Filesystem: %s \"%s\"\n" 1009 ,cur_part,volinfo.fs_type,vol_label); 1010 return 0; 1011 } 1012 1013 1014 int 1015 file_fat_ls(const char *dir) 1016 { 1017 return do_fat_read(dir, NULL, 0, LS_YES); 1018 } 1019 1020 1021 long 1022 file_fat_read(const char *filename, void *buffer, unsigned long maxsize) 1023 { 1024 printf("reading %s\n",filename); 1025 return do_fat_read(filename, buffer, maxsize, LS_NO); 1026 } 1027 1028 #endif 1029