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