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 38 downcase(char *str) 39 { 40 while (*str != '\0') { 41 TOLOWER(*str); 42 str++; 43 } 44 } 45 46 static block_dev_desc_t *cur_dev = NULL; 47 static unsigned long part_offset = 0; 48 static int cur_part = 1; 49 50 #define DOS_PART_TBL_OFFSET 0x1be 51 #define DOS_PART_MAGIC_OFFSET 0x1fe 52 #define DOS_FS_TYPE_OFFSET 0x36 53 54 int disk_read (__u32 startblock, __u32 getsize, __u8 * bufptr) 55 { 56 startblock += part_offset; 57 if (cur_dev == NULL) 58 return -1; 59 if (cur_dev->block_read) { 60 return cur_dev->block_read (cur_dev->dev 61 , startblock, getsize, (unsigned long *)bufptr); 62 } 63 return -1; 64 } 65 66 67 int 68 fat_register_device(block_dev_desc_t *dev_desc, int part_no) 69 { 70 unsigned char buffer[SECTOR_SIZE]; 71 disk_partition_t info; 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 (defined(CONFIG_CMD_IDE) || \ 87 defined(CONFIG_CMD_MG_DISK) || \ 88 defined(CONFIG_CMD_SATA) || \ 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 * Extract zero terminated short name from a directory entry. 145 */ 146 static void get_name (dir_entry *dirent, char *s_name) 147 { 148 char *ptr; 149 150 memcpy (s_name, dirent->name, 8); 151 s_name[8] = '\0'; 152 ptr = s_name; 153 while (*ptr && *ptr != ' ') 154 ptr++; 155 if (dirent->ext[0] && dirent->ext[0] != ' ') { 156 *ptr = '.'; 157 ptr++; 158 memcpy (ptr, dirent->ext, 3); 159 ptr[3] = '\0'; 160 while (*ptr && *ptr != ' ') 161 ptr++; 162 } 163 *ptr = '\0'; 164 if (*s_name == DELETED_FLAG) 165 *s_name = '\0'; 166 else if (*s_name == aRING) 167 *s_name = DELETED_FLAG; 168 downcase (s_name); 169 } 170 171 /* 172 * Get the entry at index 'entry' in a FAT (12/16/32) table. 173 * On failure 0x00 is returned. 174 */ 175 static __u32 176 get_fatent(fsdata *mydata, __u32 entry) 177 { 178 __u32 bufnum; 179 __u32 offset; 180 __u32 ret = 0x00; 181 182 switch (mydata->fatsize) { 183 case 32: 184 bufnum = entry / FAT32BUFSIZE; 185 offset = entry - bufnum * FAT32BUFSIZE; 186 break; 187 case 16: 188 bufnum = entry / FAT16BUFSIZE; 189 offset = entry - bufnum * FAT16BUFSIZE; 190 break; 191 case 12: 192 bufnum = entry / FAT12BUFSIZE; 193 offset = entry - bufnum * FAT12BUFSIZE; 194 break; 195 196 default: 197 /* Unsupported FAT size */ 198 return ret; 199 } 200 201 /* Read a new block of FAT entries into the cache. */ 202 if (bufnum != mydata->fatbufnum) { 203 int getsize = FATBUFSIZE/FS_BLOCK_SIZE; 204 __u8 *bufptr = mydata->fatbuf; 205 __u32 fatlength = mydata->fatlength; 206 __u32 startblock = bufnum * FATBUFBLOCKS; 207 208 fatlength *= SECTOR_SIZE; /* We want it in bytes now */ 209 startblock += mydata->fat_sect; /* Offset from start of disk */ 210 211 if (getsize > fatlength) getsize = fatlength; 212 if (disk_read(startblock, getsize, bufptr) < 0) { 213 FAT_DPRINT("Error reading FAT blocks\n"); 214 return ret; 215 } 216 mydata->fatbufnum = bufnum; 217 } 218 219 /* Get the actual entry from the table */ 220 switch (mydata->fatsize) { 221 case 32: 222 ret = FAT2CPU32(((__u32*)mydata->fatbuf)[offset]); 223 break; 224 case 16: 225 ret = FAT2CPU16(((__u16*)mydata->fatbuf)[offset]); 226 break; 227 case 12: { 228 __u32 off16 = (offset*3)/4; 229 __u16 val1, val2; 230 231 switch (offset & 0x3) { 232 case 0: 233 ret = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]); 234 ret &= 0xfff; 235 break; 236 case 1: 237 val1 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]); 238 val1 &= 0xf000; 239 val2 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16+1]); 240 val2 &= 0x00ff; 241 ret = (val2 << 4) | (val1 >> 12); 242 break; 243 case 2: 244 val1 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]); 245 val1 &= 0xff00; 246 val2 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16+1]); 247 val2 &= 0x000f; 248 ret = (val2 << 8) | (val1 >> 8); 249 break; 250 case 3: 251 ret = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);; 252 ret = (ret & 0xfff0) >> 4; 253 break; 254 default: 255 break; 256 } 257 } 258 break; 259 } 260 FAT_DPRINT("ret: %d, offset: %d\n", ret, offset); 261 262 return ret; 263 } 264 265 266 /* 267 * Read at most 'size' bytes from the specified cluster into 'buffer'. 268 * Return 0 on success, -1 otherwise. 269 */ 270 static int 271 get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size) 272 { 273 int idx = 0; 274 __u32 startsect; 275 276 if (clustnum > 0) { 277 startsect = mydata->data_begin + clustnum*mydata->clust_size; 278 } else { 279 startsect = mydata->rootdir_sect; 280 } 281 282 FAT_DPRINT("gc - clustnum: %d, startsect: %d\n", clustnum, startsect); 283 if (disk_read(startsect, size/FS_BLOCK_SIZE , buffer) < 0) { 284 FAT_DPRINT("Error reading data\n"); 285 return -1; 286 } 287 if(size % FS_BLOCK_SIZE) { 288 __u8 tmpbuf[FS_BLOCK_SIZE]; 289 idx= size/FS_BLOCK_SIZE; 290 if (disk_read(startsect + idx, 1, tmpbuf) < 0) { 291 FAT_DPRINT("Error reading data\n"); 292 return -1; 293 } 294 buffer += idx*FS_BLOCK_SIZE; 295 296 memcpy(buffer, tmpbuf, size % FS_BLOCK_SIZE); 297 return 0; 298 } 299 300 return 0; 301 } 302 303 304 /* 305 * Read at most 'maxsize' bytes from the file associated with 'dentptr' 306 * into 'buffer'. 307 * Return the number of bytes read or -1 on fatal errors. 308 */ 309 static long 310 get_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer, 311 unsigned long maxsize) 312 { 313 unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0; 314 unsigned int bytesperclust = mydata->clust_size * SECTOR_SIZE; 315 __u32 curclust = START(dentptr); 316 __u32 endclust, newclust; 317 unsigned long actsize; 318 319 FAT_DPRINT("Filesize: %ld bytes\n", filesize); 320 321 if (maxsize > 0 && filesize > maxsize) filesize = maxsize; 322 323 FAT_DPRINT("Reading: %ld bytes\n", filesize); 324 325 actsize=bytesperclust; 326 endclust=curclust; 327 do { 328 /* search for consecutive clusters */ 329 while(actsize < filesize) { 330 newclust = get_fatent(mydata, endclust); 331 if((newclust -1)!=endclust) 332 goto getit; 333 if (CHECK_CLUST(newclust, mydata->fatsize)) { 334 FAT_DPRINT("curclust: 0x%x\n", newclust); 335 FAT_DPRINT("Invalid FAT entry\n"); 336 return gotsize; 337 } 338 endclust=newclust; 339 actsize+= bytesperclust; 340 } 341 /* actsize >= file size */ 342 actsize -= bytesperclust; 343 /* get remaining clusters */ 344 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 345 FAT_ERROR("Error reading cluster\n"); 346 return -1; 347 } 348 /* get remaining bytes */ 349 gotsize += (int)actsize; 350 filesize -= actsize; 351 buffer += actsize; 352 actsize= filesize; 353 if (get_cluster(mydata, endclust, buffer, (int)actsize) != 0) { 354 FAT_ERROR("Error reading cluster\n"); 355 return -1; 356 } 357 gotsize+=actsize; 358 return gotsize; 359 getit: 360 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) { 361 FAT_ERROR("Error reading cluster\n"); 362 return -1; 363 } 364 gotsize += (int)actsize; 365 filesize -= actsize; 366 buffer += actsize; 367 curclust = get_fatent(mydata, endclust); 368 if (CHECK_CLUST(curclust, mydata->fatsize)) { 369 FAT_DPRINT("curclust: 0x%x\n", curclust); 370 FAT_ERROR("Invalid FAT entry\n"); 371 return gotsize; 372 } 373 actsize=bytesperclust; 374 endclust=curclust; 375 } while (1); 376 } 377 378 379 #ifdef CONFIG_SUPPORT_VFAT 380 /* 381 * Extract the file name information from 'slotptr' into 'l_name', 382 * starting at l_name[*idx]. 383 * Return 1 if terminator (zero byte) is found, 0 otherwise. 384 */ 385 static int 386 slot2str(dir_slot *slotptr, char *l_name, int *idx) 387 { 388 int j; 389 390 for (j = 0; j <= 8; j += 2) { 391 l_name[*idx] = slotptr->name0_4[j]; 392 if (l_name[*idx] == 0x00) return 1; 393 (*idx)++; 394 } 395 for (j = 0; j <= 10; j += 2) { 396 l_name[*idx] = slotptr->name5_10[j]; 397 if (l_name[*idx] == 0x00) return 1; 398 (*idx)++; 399 } 400 for (j = 0; j <= 2; j += 2) { 401 l_name[*idx] = slotptr->name11_12[j]; 402 if (l_name[*idx] == 0x00) return 1; 403 (*idx)++; 404 } 405 406 return 0; 407 } 408 409 410 /* 411 * Extract the full long filename starting at 'retdent' (which is really 412 * a slot) into 'l_name'. If successful also copy the real directory entry 413 * into 'retdent' 414 * Return 0 on success, -1 otherwise. 415 */ 416 __attribute__ ((__aligned__(__alignof__(dir_entry)))) 417 __u8 get_vfatname_block[MAX_CLUSTSIZE]; 418 static int 419 get_vfatname(fsdata *mydata, int curclust, __u8 *cluster, 420 dir_entry *retdent, char *l_name) 421 { 422 dir_entry *realdent; 423 dir_slot *slotptr = (dir_slot*) retdent; 424 __u8 *nextclust = cluster + mydata->clust_size * SECTOR_SIZE; 425 __u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff; 426 int idx = 0; 427 428 while ((__u8*)slotptr < nextclust) { 429 if (counter == 0) break; 430 if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter) 431 return -1; 432 slotptr++; 433 counter--; 434 } 435 436 if ((__u8*)slotptr >= nextclust) { 437 dir_slot *slotptr2; 438 439 slotptr--; 440 curclust = get_fatent(mydata, curclust); 441 if (CHECK_CLUST(curclust, mydata->fatsize)) { 442 FAT_DPRINT("curclust: 0x%x\n", curclust); 443 FAT_ERROR("Invalid FAT entry\n"); 444 return -1; 445 } 446 if (get_cluster(mydata, curclust, get_vfatname_block, 447 mydata->clust_size * SECTOR_SIZE) != 0) { 448 FAT_DPRINT("Error: reading directory block\n"); 449 return -1; 450 } 451 slotptr2 = (dir_slot*) get_vfatname_block; 452 while (slotptr2->id > 0x01) { 453 slotptr2++; 454 } 455 /* Save the real directory entry */ 456 realdent = (dir_entry*)slotptr2 + 1; 457 while ((__u8*)slotptr2 >= get_vfatname_block) { 458 slot2str(slotptr2, l_name, &idx); 459 slotptr2--; 460 } 461 } else { 462 /* Save the real directory entry */ 463 realdent = (dir_entry*)slotptr; 464 } 465 466 do { 467 slotptr--; 468 if (slot2str(slotptr, l_name, &idx)) break; 469 } while (!(slotptr->id & LAST_LONG_ENTRY_MASK)); 470 471 l_name[idx] = '\0'; 472 if (*l_name == DELETED_FLAG) *l_name = '\0'; 473 else if (*l_name == aRING) *l_name = DELETED_FLAG; 474 downcase(l_name); 475 476 /* Return the real directory entry */ 477 memcpy(retdent, realdent, sizeof(dir_entry)); 478 479 return 0; 480 } 481 482 483 /* Calculate short name checksum */ 484 static __u8 485 mkcksum(const char *str) 486 { 487 int i; 488 __u8 ret = 0; 489 490 for (i = 0; i < 11; i++) { 491 ret = (((ret&1)<<7)|((ret&0xfe)>>1)) + str[i]; 492 } 493 494 return ret; 495 } 496 #endif 497 498 499 /* 500 * Get the directory entry associated with 'filename' from the directory 501 * starting at 'startsect' 502 */ 503 __attribute__ ((__aligned__(__alignof__(dir_entry)))) 504 __u8 get_dentfromdir_block[MAX_CLUSTSIZE]; 505 static dir_entry *get_dentfromdir (fsdata * mydata, int startsect, 506 char *filename, dir_entry * retdent, 507 int dols) 508 { 509 __u16 prevcksum = 0xffff; 510 __u32 curclust = START (retdent); 511 int files = 0, dirs = 0; 512 513 FAT_DPRINT ("get_dentfromdir: %s\n", filename); 514 while (1) { 515 dir_entry *dentptr; 516 int i; 517 518 if (get_cluster (mydata, curclust, get_dentfromdir_block, 519 mydata->clust_size * SECTOR_SIZE) != 0) { 520 FAT_DPRINT ("Error: reading directory block\n"); 521 return NULL; 522 } 523 dentptr = (dir_entry *) get_dentfromdir_block; 524 for (i = 0; i < DIRENTSPERCLUST; i++) { 525 char s_name[14], l_name[256]; 526 527 l_name[0] = '\0'; 528 if (dentptr->name[0] == DELETED_FLAG) { 529 dentptr++; 530 continue; 531 } 532 if ((dentptr->attr & ATTR_VOLUME)) { 533 #ifdef CONFIG_SUPPORT_VFAT 534 if ((dentptr->attr & ATTR_VFAT) && 535 (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) { 536 prevcksum = ((dir_slot *) dentptr) 537 ->alias_checksum; 538 get_vfatname (mydata, curclust, get_dentfromdir_block, 539 dentptr, l_name); 540 if (dols) { 541 int isdir = (dentptr->attr & ATTR_DIR); 542 char dirc; 543 int doit = 0; 544 545 if (isdir) { 546 dirs++; 547 dirc = '/'; 548 doit = 1; 549 } else { 550 dirc = ' '; 551 if (l_name[0] != 0) { 552 files++; 553 doit = 1; 554 } 555 } 556 if (doit) { 557 if (dirc == ' ') { 558 printf (" %8ld %s%c\n", 559 (long) FAT2CPU32 (dentptr->size), 560 l_name, dirc); 561 } else { 562 printf (" %s%c\n", l_name, dirc); 563 } 564 } 565 dentptr++; 566 continue; 567 } 568 FAT_DPRINT ("vfatname: |%s|\n", l_name); 569 } else 570 #endif 571 { 572 /* Volume label or VFAT entry */ 573 dentptr++; 574 continue; 575 } 576 } 577 if (dentptr->name[0] == 0) { 578 if (dols) { 579 printf ("\n%d file(s), %d dir(s)\n\n", files, dirs); 580 } 581 FAT_DPRINT ("Dentname == NULL - %d\n", i); 582 return NULL; 583 } 584 #ifdef CONFIG_SUPPORT_VFAT 585 if (dols && mkcksum (dentptr->name) == prevcksum) { 586 dentptr++; 587 continue; 588 } 589 #endif 590 get_name (dentptr, s_name); 591 if (dols) { 592 int isdir = (dentptr->attr & ATTR_DIR); 593 char dirc; 594 int doit = 0; 595 596 if (isdir) { 597 dirs++; 598 dirc = '/'; 599 doit = 1; 600 } else { 601 dirc = ' '; 602 if (s_name[0] != 0) { 603 files++; 604 doit = 1; 605 } 606 } 607 if (doit) { 608 if (dirc == ' ') { 609 printf (" %8ld %s%c\n", 610 (long) FAT2CPU32 (dentptr->size), s_name, 611 dirc); 612 } else { 613 printf (" %s%c\n", s_name, dirc); 614 } 615 } 616 dentptr++; 617 continue; 618 } 619 if (strcmp (filename, s_name) && strcmp (filename, l_name)) { 620 FAT_DPRINT ("Mismatch: |%s|%s|\n", s_name, l_name); 621 dentptr++; 622 continue; 623 } 624 memcpy (retdent, dentptr, sizeof (dir_entry)); 625 626 FAT_DPRINT ("DentName: %s", s_name); 627 FAT_DPRINT (", start: 0x%x", START (dentptr)); 628 FAT_DPRINT (", size: 0x%x %s\n", 629 FAT2CPU32 (dentptr->size), 630 (dentptr->attr & ATTR_DIR) ? "(DIR)" : ""); 631 632 return retdent; 633 } 634 curclust = get_fatent (mydata, curclust); 635 if (CHECK_CLUST(curclust, mydata->fatsize)) { 636 FAT_DPRINT ("curclust: 0x%x\n", curclust); 637 FAT_ERROR ("Invalid FAT entry\n"); 638 return NULL; 639 } 640 } 641 642 return NULL; 643 } 644 645 646 /* 647 * Read boot sector and volume info from a FAT filesystem 648 */ 649 static int 650 read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize) 651 { 652 __u8 block[FS_BLOCK_SIZE]; 653 volume_info *vistart; 654 655 if (disk_read(0, 1, block) < 0) { 656 FAT_DPRINT("Error: reading block\n"); 657 return -1; 658 } 659 660 memcpy(bs, block, sizeof(boot_sector)); 661 bs->reserved = FAT2CPU16(bs->reserved); 662 bs->fat_length = FAT2CPU16(bs->fat_length); 663 bs->secs_track = FAT2CPU16(bs->secs_track); 664 bs->heads = FAT2CPU16(bs->heads); 665 #if 0 /* UNUSED */ 666 bs->hidden = FAT2CPU32(bs->hidden); 667 #endif 668 bs->total_sect = FAT2CPU32(bs->total_sect); 669 670 /* FAT32 entries */ 671 if (bs->fat_length == 0) { 672 /* Assume FAT32 */ 673 bs->fat32_length = FAT2CPU32(bs->fat32_length); 674 bs->flags = FAT2CPU16(bs->flags); 675 bs->root_cluster = FAT2CPU32(bs->root_cluster); 676 bs->info_sector = FAT2CPU16(bs->info_sector); 677 bs->backup_boot = FAT2CPU16(bs->backup_boot); 678 vistart = (volume_info*) (block + sizeof(boot_sector)); 679 *fatsize = 32; 680 } else { 681 vistart = (volume_info*) &(bs->fat32_length); 682 *fatsize = 0; 683 } 684 memcpy(volinfo, vistart, sizeof(volume_info)); 685 686 if (*fatsize == 32) { 687 if (strncmp(FAT32_SIGN, vistart->fs_type, SIGNLEN) == 0) { 688 return 0; 689 } 690 } else { 691 if (strncmp(FAT12_SIGN, vistart->fs_type, SIGNLEN) == 0) { 692 *fatsize = 12; 693 return 0; 694 } 695 if (strncmp(FAT16_SIGN, vistart->fs_type, SIGNLEN) == 0) { 696 *fatsize = 16; 697 return 0; 698 } 699 } 700 701 FAT_DPRINT("Error: broken fs_type sign\n"); 702 return -1; 703 } 704 705 __attribute__ ((__aligned__(__alignof__(dir_entry)))) 706 __u8 do_fat_read_block[MAX_CLUSTSIZE]; 707 long 708 do_fat_read (const char *filename, void *buffer, unsigned long maxsize, 709 int dols) 710 { 711 #if CONFIG_NIOS /* NIOS CPU cannot access big automatic arrays */ 712 static 713 #endif 714 char fnamecopy[2048]; 715 boot_sector bs; 716 volume_info volinfo; 717 fsdata datablock; 718 fsdata *mydata = &datablock; 719 dir_entry *dentptr; 720 __u16 prevcksum = 0xffff; 721 char *subname = ""; 722 int rootdir_size, cursect; 723 int idx, isdir = 0; 724 int files = 0, dirs = 0; 725 long ret = 0; 726 int firsttime; 727 728 if (read_bootsectandvi (&bs, &volinfo, &mydata->fatsize)) { 729 FAT_DPRINT ("Error: reading boot sector\n"); 730 return -1; 731 } 732 if (mydata->fatsize == 32) { 733 mydata->fatlength = bs.fat32_length; 734 } else { 735 mydata->fatlength = bs.fat_length; 736 } 737 mydata->fat_sect = bs.reserved; 738 cursect = mydata->rootdir_sect 739 = mydata->fat_sect + mydata->fatlength * bs.fats; 740 mydata->clust_size = bs.cluster_size; 741 if (mydata->fatsize == 32) { 742 rootdir_size = mydata->clust_size; 743 mydata->data_begin = mydata->rootdir_sect /* + rootdir_size */ 744 - (mydata->clust_size * 2); 745 } else { 746 rootdir_size = ((bs.dir_entries[1] * (int) 256 + bs.dir_entries[0]) 747 * sizeof (dir_entry)) / SECTOR_SIZE; 748 mydata->data_begin = mydata->rootdir_sect + rootdir_size 749 - (mydata->clust_size * 2); 750 } 751 mydata->fatbufnum = -1; 752 753 FAT_DPRINT ("FAT%d, fatlength: %d\n", mydata->fatsize, 754 mydata->fatlength); 755 FAT_DPRINT ("Rootdir begins at sector: %d, offset: %x, size: %d\n" 756 "Data begins at: %d\n", 757 mydata->rootdir_sect, mydata->rootdir_sect * SECTOR_SIZE, 758 rootdir_size, mydata->data_begin); 759 FAT_DPRINT ("Cluster size: %d\n", mydata->clust_size); 760 761 /* "cwd" is always the root... */ 762 while (ISDIRDELIM (*filename)) 763 filename++; 764 /* Make a copy of the filename and convert it to lowercase */ 765 strcpy (fnamecopy, filename); 766 downcase (fnamecopy); 767 if (*fnamecopy == '\0') { 768 if (!dols) 769 return -1; 770 dols = LS_ROOT; 771 } else if ((idx = dirdelim (fnamecopy)) >= 0) { 772 isdir = 1; 773 fnamecopy[idx] = '\0'; 774 subname = fnamecopy + idx + 1; 775 /* Handle multiple delimiters */ 776 while (ISDIRDELIM (*subname)) 777 subname++; 778 } else if (dols) { 779 isdir = 1; 780 } 781 782 while (1) { 783 int i; 784 785 if (disk_read (cursect, mydata->clust_size, do_fat_read_block) < 0) { 786 FAT_DPRINT ("Error: reading rootdir block\n"); 787 return -1; 788 } 789 dentptr = (dir_entry *) do_fat_read_block; 790 for (i = 0; i < DIRENTSPERBLOCK; i++) { 791 char s_name[14], l_name[256]; 792 793 l_name[0] = '\0'; 794 if ((dentptr->attr & ATTR_VOLUME)) { 795 #ifdef CONFIG_SUPPORT_VFAT 796 if ((dentptr->attr & ATTR_VFAT) && 797 (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) { 798 prevcksum = ((dir_slot *) dentptr)->alias_checksum; 799 get_vfatname (mydata, 0, do_fat_read_block, dentptr, l_name); 800 if (dols == LS_ROOT) { 801 int isdir = (dentptr->attr & ATTR_DIR); 802 char dirc; 803 int doit = 0; 804 805 if (isdir) { 806 dirs++; 807 dirc = '/'; 808 doit = 1; 809 } else { 810 dirc = ' '; 811 if (l_name[0] != 0) { 812 files++; 813 doit = 1; 814 } 815 } 816 if (doit) { 817 if (dirc == ' ') { 818 printf (" %8ld %s%c\n", 819 (long) FAT2CPU32 (dentptr->size), 820 l_name, dirc); 821 } else { 822 printf (" %s%c\n", l_name, dirc); 823 } 824 } 825 dentptr++; 826 continue; 827 } 828 FAT_DPRINT ("Rootvfatname: |%s|\n", l_name); 829 } else 830 #endif 831 { 832 /* Volume label or VFAT entry */ 833 dentptr++; 834 continue; 835 } 836 } else if (dentptr->name[0] == 0) { 837 FAT_DPRINT ("RootDentname == NULL - %d\n", i); 838 if (dols == LS_ROOT) { 839 printf ("\n%d file(s), %d dir(s)\n\n", files, dirs); 840 return 0; 841 } 842 return -1; 843 } 844 #ifdef CONFIG_SUPPORT_VFAT 845 else if (dols == LS_ROOT 846 && mkcksum (dentptr->name) == prevcksum) { 847 dentptr++; 848 continue; 849 } 850 #endif 851 get_name (dentptr, s_name); 852 if (dols == LS_ROOT) { 853 int isdir = (dentptr->attr & ATTR_DIR); 854 char dirc; 855 int doit = 0; 856 857 if (isdir) { 858 dirc = '/'; 859 if (s_name[0] != 0) { 860 dirs++; 861 doit = 1; 862 } 863 } else { 864 dirc = ' '; 865 if (s_name[0] != 0) { 866 files++; 867 doit = 1; 868 } 869 } 870 if (doit) { 871 if (dirc == ' ') { 872 printf (" %8ld %s%c\n", 873 (long) FAT2CPU32 (dentptr->size), s_name, 874 dirc); 875 } else { 876 printf (" %s%c\n", s_name, dirc); 877 } 878 } 879 dentptr++; 880 continue; 881 } 882 if (strcmp (fnamecopy, s_name) && strcmp (fnamecopy, l_name)) { 883 FAT_DPRINT ("RootMismatch: |%s|%s|\n", s_name, l_name); 884 dentptr++; 885 continue; 886 } 887 if (isdir && !(dentptr->attr & ATTR_DIR)) 888 return -1; 889 890 FAT_DPRINT ("RootName: %s", s_name); 891 FAT_DPRINT (", start: 0x%x", START (dentptr)); 892 FAT_DPRINT (", size: 0x%x %s\n", 893 FAT2CPU32 (dentptr->size), isdir ? "(DIR)" : ""); 894 895 goto rootdir_done; /* We got a match */ 896 } 897 cursect++; 898 } 899 rootdir_done: 900 901 firsttime = 1; 902 while (isdir) { 903 int startsect = mydata->data_begin 904 + START (dentptr) * mydata->clust_size; 905 dir_entry dent; 906 char *nextname = NULL; 907 908 dent = *dentptr; 909 dentptr = &dent; 910 911 idx = dirdelim (subname); 912 if (idx >= 0) { 913 subname[idx] = '\0'; 914 nextname = subname + idx + 1; 915 /* Handle multiple delimiters */ 916 while (ISDIRDELIM (*nextname)) 917 nextname++; 918 if (dols && *nextname == '\0') 919 firsttime = 0; 920 } else { 921 if (dols && firsttime) { 922 firsttime = 0; 923 } else { 924 isdir = 0; 925 } 926 } 927 928 if (get_dentfromdir (mydata, startsect, subname, dentptr, 929 isdir ? 0 : dols) == NULL) { 930 if (dols && !isdir) 931 return 0; 932 return -1; 933 } 934 935 if (idx >= 0) { 936 if (!(dentptr->attr & ATTR_DIR)) 937 return -1; 938 subname = nextname; 939 } 940 } 941 ret = get_contents (mydata, dentptr, buffer, maxsize); 942 FAT_DPRINT ("Size: %d, got: %ld\n", FAT2CPU32 (dentptr->size), ret); 943 944 return ret; 945 } 946 947 948 int 949 file_fat_detectfs(void) 950 { 951 boot_sector bs; 952 volume_info volinfo; 953 int fatsize; 954 char vol_label[12]; 955 956 if(cur_dev==NULL) { 957 printf("No current device\n"); 958 return 1; 959 } 960 #if defined(CONFIG_CMD_IDE) || \ 961 defined(CONFIG_CMD_MG_DISK) || \ 962 defined(CONFIG_CMD_SATA) || \ 963 defined(CONFIG_CMD_SCSI) || \ 964 defined(CONFIG_CMD_USB) || \ 965 defined(CONFIG_MMC) 966 printf("Interface: "); 967 switch(cur_dev->if_type) { 968 case IF_TYPE_IDE : printf("IDE"); break; 969 case IF_TYPE_SATA : printf("SATA"); 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" 988 ,cur_part,volinfo.fs_type,vol_label); 989 return 0; 990 } 991 992 993 int 994 file_fat_ls(const char *dir) 995 { 996 return do_fat_read(dir, NULL, 0, LS_YES); 997 } 998 999 1000 long 1001 file_fat_read(const char *filename, void *buffer, unsigned long maxsize) 1002 { 1003 printf("reading %s\n",filename); 1004 return do_fat_read(filename, buffer, maxsize, LS_NO); 1005 } 1006