4 * R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg
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
9 * SPDX-License-Identifier: GPL-2.0+
18 #include <asm/byteorder.h>
22 #include <linux/compiler.h>
23 #include <linux/ctype.h>
26 * Convert a string to lowercase. Converts at most 'len' characters,
27 * 'len' may be larger than the length of 'str' if 'str' is NULL
30 static void downcase(char *str, size_t len)
32 while (*str != '\0' && len--) {
38 static struct blk_desc *cur_dev;
39 static disk_partition_t cur_part_info;
41 #define DOS_BOOT_MAGIC_OFFSET 0x1fe
42 #define DOS_FS_TYPE_OFFSET 0x36
43 #define DOS_FS32_TYPE_OFFSET 0x52
45 static int disk_read(__u32 block, __u32 nr_blocks, void *buf)
52 ret = blk_dread(cur_dev, cur_part_info.start + block, nr_blocks, buf);
60 int fat_set_blk_dev(struct blk_desc *dev_desc, disk_partition_t *info)
62 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
65 cur_part_info = *info;
67 /* Make sure it has a valid FAT header */
68 if (disk_read(0, 1, buffer) != 1) {
73 /* Check if it's actually a DOS volume */
74 if (memcmp(buffer + DOS_BOOT_MAGIC_OFFSET, "\x55\xAA", 2)) {
79 /* Check for FAT12/FAT16/FAT32 filesystem */
80 if (!memcmp(buffer + DOS_FS_TYPE_OFFSET, "FAT", 3))
82 if (!memcmp(buffer + DOS_FS32_TYPE_OFFSET, "FAT32", 5))
89 int fat_register_device(struct blk_desc *dev_desc, int part_no)
91 disk_partition_t info;
93 /* First close any currently found FAT filesystem */
96 /* Read the partition table, if present */
97 if (part_get_info(dev_desc, part_no, &info)) {
99 printf("** Partition %d not valid on device %d **\n",
100 part_no, dev_desc->devnum);
105 info.size = dev_desc->lba;
106 info.blksz = dev_desc->blksz;
110 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
115 return fat_set_blk_dev(dev_desc, &info);
119 * Extract zero terminated short name from a directory entry.
121 static void get_name(dir_entry *dirent, char *s_name)
125 memcpy(s_name, dirent->name, 8);
128 while (*ptr && *ptr != ' ')
130 if (dirent->lcase & CASE_LOWER_BASE)
131 downcase(s_name, (unsigned)(ptr - s_name));
132 if (dirent->ext[0] && dirent->ext[0] != ' ') {
134 memcpy(ptr, dirent->ext, 3);
135 if (dirent->lcase & CASE_LOWER_EXT)
138 while (*ptr && *ptr != ' ')
142 if (*s_name == DELETED_FLAG)
144 else if (*s_name == aRING)
145 *s_name = DELETED_FLAG;
148 static int flush_dirty_fat_buffer(fsdata *mydata);
149 #if !defined(CONFIG_FAT_WRITE)
150 /* Stub for read only operation */
151 int flush_dirty_fat_buffer(fsdata *mydata)
159 * Get the entry at index 'entry' in a FAT (12/16/32) table.
160 * On failure 0x00 is returned.
162 static __u32 get_fatent(fsdata *mydata, __u32 entry)
168 if (CHECK_CLUST(entry, mydata->fatsize)) {
169 printf("Error: Invalid FAT entry: 0x%08x\n", entry);
173 switch (mydata->fatsize) {
175 bufnum = entry / FAT32BUFSIZE;
176 offset = entry - bufnum * FAT32BUFSIZE;
179 bufnum = entry / FAT16BUFSIZE;
180 offset = entry - bufnum * FAT16BUFSIZE;
183 bufnum = entry / FAT12BUFSIZE;
184 offset = entry - bufnum * FAT12BUFSIZE;
188 /* Unsupported FAT size */
192 debug("FAT%d: entry: 0x%08x = %d, offset: 0x%04x = %d\n",
193 mydata->fatsize, entry, entry, offset, offset);
195 /* Read a new block of FAT entries into the cache. */
196 if (bufnum != mydata->fatbufnum) {
197 __u32 getsize = FATBUFBLOCKS;
198 __u8 *bufptr = mydata->fatbuf;
199 __u32 fatlength = mydata->fatlength;
200 __u32 startblock = bufnum * FATBUFBLOCKS;
202 /* Cap length if fatlength is not a multiple of FATBUFBLOCKS */
203 if (startblock + getsize > fatlength)
204 getsize = fatlength - startblock;
206 startblock += mydata->fat_sect; /* Offset from start of disk */
208 /* Write back the fatbuf to the disk */
209 if (flush_dirty_fat_buffer(mydata) < 0)
212 if (disk_read(startblock, getsize, bufptr) < 0) {
213 debug("Error reading FAT blocks\n");
216 mydata->fatbufnum = bufnum;
219 /* Get the actual entry from the table */
220 switch (mydata->fatsize) {
222 ret = FAT2CPU32(((__u32 *) mydata->fatbuf)[offset]);
225 ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[offset]);
228 off8 = (offset * 3) / 2;
229 /* fatbut + off8 may be unaligned, read in byte granularity */
230 ret = mydata->fatbuf[off8] + (mydata->fatbuf[off8 + 1] << 8);
236 debug("FAT%d: ret: 0x%08x, entry: 0x%08x, offset: 0x%04x\n",
237 mydata->fatsize, ret, entry, offset);
243 * Read at most 'size' bytes from the specified cluster into 'buffer'.
244 * Return 0 on success, -1 otherwise.
247 get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size)
254 startsect = clust_to_sect(mydata, clustnum);
256 startsect = mydata->rootdir_sect;
259 debug("gc - clustnum: %d, startsect: %d\n", clustnum, startsect);
261 if ((unsigned long)buffer & (ARCH_DMA_MINALIGN - 1)) {
262 ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size);
264 printf("FAT: Misaligned buffer address (%p)\n", buffer);
266 while (size >= mydata->sect_size) {
267 ret = disk_read(startsect++, 1, tmpbuf);
269 debug("Error reading data (got %d)\n", ret);
273 memcpy(buffer, tmpbuf, mydata->sect_size);
274 buffer += mydata->sect_size;
275 size -= mydata->sect_size;
278 idx = size / mydata->sect_size;
279 ret = disk_read(startsect, idx, buffer);
281 debug("Error reading data (got %d)\n", ret);
285 idx *= mydata->sect_size;
290 ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size);
292 ret = disk_read(startsect, 1, tmpbuf);
294 debug("Error reading data (got %d)\n", ret);
298 memcpy(buffer, tmpbuf, size);
305 * Read at most 'maxsize' bytes from 'pos' in the file associated with 'dentptr'
307 * Update the number of bytes read in *gotsize or return -1 on fatal errors.
309 __u8 get_contents_vfatname_block[MAX_CLUSTSIZE]
310 __aligned(ARCH_DMA_MINALIGN);
312 static int get_contents(fsdata *mydata, dir_entry *dentptr, loff_t pos,
313 __u8 *buffer, loff_t maxsize, loff_t *gotsize)
315 loff_t filesize = FAT2CPU32(dentptr->size);
316 unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;
317 __u32 curclust = START(dentptr);
318 __u32 endclust, newclust;
322 debug("Filesize: %llu bytes\n", filesize);
324 if (pos >= filesize) {
325 debug("Read position past EOF: %llu\n", pos);
329 if (maxsize > 0 && filesize > pos + maxsize)
330 filesize = pos + maxsize;
332 debug("%llu bytes\n", filesize);
334 actsize = bytesperclust;
336 /* go to cluster at pos */
337 while (actsize <= pos) {
338 curclust = get_fatent(mydata, curclust);
339 if (CHECK_CLUST(curclust, mydata->fatsize)) {
340 debug("curclust: 0x%x\n", curclust);
341 debug("Invalid FAT entry\n");
344 actsize += bytesperclust;
348 actsize -= bytesperclust;
352 /* align to beginning of next cluster if any */
354 actsize = min(filesize, (loff_t)bytesperclust);
355 if (get_cluster(mydata, curclust, get_contents_vfatname_block,
356 (int)actsize) != 0) {
357 printf("Error reading cluster\n");
362 memcpy(buffer, get_contents_vfatname_block + pos, actsize);
368 curclust = get_fatent(mydata, curclust);
369 if (CHECK_CLUST(curclust, mydata->fatsize)) {
370 debug("curclust: 0x%x\n", curclust);
371 debug("Invalid FAT entry\n");
376 actsize = bytesperclust;
380 /* search for consecutive clusters */
381 while (actsize < filesize) {
382 newclust = get_fatent(mydata, endclust);
383 if ((newclust - 1) != endclust)
385 if (CHECK_CLUST(newclust, mydata->fatsize)) {
386 debug("curclust: 0x%x\n", newclust);
387 debug("Invalid FAT entry\n");
391 actsize += bytesperclust;
394 /* get remaining bytes */
396 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
397 printf("Error reading cluster\n");
403 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
404 printf("Error reading cluster\n");
407 *gotsize += (int)actsize;
411 curclust = get_fatent(mydata, endclust);
412 if (CHECK_CLUST(curclust, mydata->fatsize)) {
413 debug("curclust: 0x%x\n", curclust);
414 printf("Invalid FAT entry\n");
417 actsize = bytesperclust;
423 * Extract the file name information from 'slotptr' into 'l_name',
424 * starting at l_name[*idx].
425 * Return 1 if terminator (zero byte) is found, 0 otherwise.
427 static int slot2str(dir_slot *slotptr, char *l_name, int *idx)
431 for (j = 0; j <= 8; j += 2) {
432 l_name[*idx] = slotptr->name0_4[j];
433 if (l_name[*idx] == 0x00)
437 for (j = 0; j <= 10; j += 2) {
438 l_name[*idx] = slotptr->name5_10[j];
439 if (l_name[*idx] == 0x00)
443 for (j = 0; j <= 2; j += 2) {
444 l_name[*idx] = slotptr->name11_12[j];
445 if (l_name[*idx] == 0x00)
453 /* Calculate short name checksum */
454 static __u8 mkcksum(const char name[8], const char ext[3])
460 for (i = 0; i < 8; i++)
461 ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + name[i];
462 for (i = 0; i < 3; i++)
463 ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + ext[i];
469 * TODO these should go away once fat_write is reworked to use the
472 __u8 get_dentfromdir_block[MAX_CLUSTSIZE]
473 __aligned(ARCH_DMA_MINALIGN);
474 __u8 do_fat_read_at_block[MAX_CLUSTSIZE]
475 __aligned(ARCH_DMA_MINALIGN);
478 * Read boot sector and volume info from a FAT filesystem
481 read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize)
484 volume_info *vistart;
487 if (cur_dev == NULL) {
488 debug("Error: no device selected\n");
492 block = malloc_cache_aligned(cur_dev->blksz);
494 debug("Error: allocating block\n");
498 if (disk_read(0, 1, block) < 0) {
499 debug("Error: reading block\n");
503 memcpy(bs, block, sizeof(boot_sector));
504 bs->reserved = FAT2CPU16(bs->reserved);
505 bs->fat_length = FAT2CPU16(bs->fat_length);
506 bs->secs_track = FAT2CPU16(bs->secs_track);
507 bs->heads = FAT2CPU16(bs->heads);
508 bs->total_sect = FAT2CPU32(bs->total_sect);
511 if (bs->fat_length == 0) {
513 bs->fat32_length = FAT2CPU32(bs->fat32_length);
514 bs->flags = FAT2CPU16(bs->flags);
515 bs->root_cluster = FAT2CPU32(bs->root_cluster);
516 bs->info_sector = FAT2CPU16(bs->info_sector);
517 bs->backup_boot = FAT2CPU16(bs->backup_boot);
518 vistart = (volume_info *)(block + sizeof(boot_sector));
521 vistart = (volume_info *)&(bs->fat32_length);
524 memcpy(volinfo, vistart, sizeof(volume_info));
526 if (*fatsize == 32) {
527 if (strncmp(FAT32_SIGN, vistart->fs_type, SIGNLEN) == 0)
530 if (strncmp(FAT12_SIGN, vistart->fs_type, SIGNLEN) == 0) {
534 if (strncmp(FAT16_SIGN, vistart->fs_type, SIGNLEN) == 0) {
540 debug("Error: broken fs_type sign\n");
548 static int get_fs_info(fsdata *mydata)
554 ret = read_bootsectandvi(&bs, &volinfo, &mydata->fatsize);
556 debug("Error: reading boot sector\n");
560 if (mydata->fatsize == 32) {
561 mydata->fatlength = bs.fat32_length;
563 mydata->fatlength = bs.fat_length;
566 mydata->fat_sect = bs.reserved;
568 mydata->rootdir_sect = mydata->fat_sect + mydata->fatlength * bs.fats;
570 mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0];
571 mydata->clust_size = bs.cluster_size;
572 if (mydata->sect_size != cur_part_info.blksz) {
573 printf("Error: FAT sector size mismatch (fs=%hu, dev=%lu)\n",
574 mydata->sect_size, cur_part_info.blksz);
578 if (mydata->fatsize == 32) {
579 mydata->data_begin = mydata->rootdir_sect -
580 (mydata->clust_size * 2);
581 mydata->root_cluster = bs.root_cluster;
583 mydata->rootdir_size = ((bs.dir_entries[1] * (int)256 +
587 mydata->data_begin = mydata->rootdir_sect +
588 mydata->rootdir_size -
589 (mydata->clust_size * 2);
590 mydata->root_cluster =
591 sect_to_clust(mydata, mydata->rootdir_sect);
594 mydata->fatbufnum = -1;
595 mydata->fat_dirty = 0;
596 mydata->fatbuf = malloc_cache_aligned(FATBUFSIZE);
597 if (mydata->fatbuf == NULL) {
598 debug("Error: allocating memory\n");
602 debug("FAT%d, fat_sect: %d, fatlength: %d\n",
603 mydata->fatsize, mydata->fat_sect, mydata->fatlength);
604 debug("Rootdir begins at cluster: %d, sector: %d, offset: %x\n"
605 "Data begins at: %d\n",
606 mydata->root_cluster,
607 mydata->rootdir_sect,
608 mydata->rootdir_sect * mydata->sect_size, mydata->data_begin);
609 debug("Sector size: %d, cluster size: %d\n", mydata->sect_size,
617 * Directory iterator, to simplify filesystem traversal
619 * Implements an iterator pattern to traverse directory tables,
620 * transparently handling directory tables split across multiple
621 * clusters, and the difference between FAT12/FAT16 root directory
622 * (contiguous) and subdirectories + FAT32 root (chained).
626 * for (fat_itr_root(&itr, fsdata); fat_itr_next(&itr); ) {
627 * // to traverse down to a subdirectory pointed to by
628 * // current iterator position:
629 * fat_itr_child(&itr, &itr);
632 * For more complete example, see fat_itr_resolve()
636 fsdata *fsdata; /* filesystem parameters */
637 unsigned clust; /* current cluster */
638 int last_cluster; /* set once we've read last cluster */
639 int is_root; /* is iterator at root directory */
640 int remaining; /* remaining dent's in current cluster */
642 /* current iterator position values: */
643 dir_entry *dent; /* current directory entry */
644 char l_name[VFAT_MAXLEN_BYTES]; /* long (vfat) name */
645 char s_name[14]; /* short 8.3 name */
646 char *name; /* l_name if there is one, else s_name */
648 /* storage for current cluster in memory: */
649 u8 block[MAX_CLUSTSIZE] __aligned(ARCH_DMA_MINALIGN);
652 static int fat_itr_isdir(fat_itr *itr);
655 * fat_itr_root() - initialize an iterator to start at the root
658 * @itr: iterator to initialize
659 * @fsdata: filesystem data for the partition
660 * @return 0 on success, else -errno
662 static int fat_itr_root(fat_itr *itr, fsdata *fsdata)
664 if (get_fs_info(fsdata))
667 itr->fsdata = fsdata;
668 itr->clust = fsdata->root_cluster;
671 itr->last_cluster = 0;
678 * fat_itr_child() - initialize an iterator to descend into a sub-
681 * Initializes 'itr' to iterate the contents of the directory at
682 * the current cursor position of 'parent'. It is an error to
683 * call this if the current cursor of 'parent' is pointing at a
686 * Note that 'itr' and 'parent' can be the same pointer if you do
687 * not need to preserve 'parent' after this call, which is useful
688 * for traversing directory structure to resolve a file/directory.
690 * @itr: iterator to initialize
691 * @parent: the iterator pointing at a directory entry in the
692 * parent directory of the directory to iterate
694 static void fat_itr_child(fat_itr *itr, fat_itr *parent)
696 fsdata *mydata = parent->fsdata; /* for silly macros */
697 unsigned clustnum = START(parent->dent);
699 assert(fat_itr_isdir(parent));
701 itr->fsdata = parent->fsdata;
703 itr->clust = clustnum;
706 itr->clust = parent->fsdata->root_cluster;
711 itr->last_cluster = 0;
714 static void *next_cluster(fat_itr *itr)
716 fsdata *mydata = itr->fsdata; /* for silly macros */
720 /* have we reached the end? */
721 if (itr->last_cluster)
724 sect = clust_to_sect(itr->fsdata, itr->clust);
726 debug("FAT read(sect=%d), clust_size=%d, DIRENTSPERBLOCK=%zd\n",
727 sect, itr->fsdata->clust_size, DIRENTSPERBLOCK);
730 * NOTE: do_fat_read_at() had complicated logic to deal w/
731 * vfat names that span multiple clusters in the fat16 case,
732 * which get_dentfromdir() probably also needed (and was
733 * missing). And not entirely sure what fat32 didn't have
734 * the same issue.. We solve that by only caring about one
735 * dent at a time and iteratively constructing the vfat long
738 ret = disk_read(sect, itr->fsdata->clust_size,
741 debug("Error: reading block\n");
745 if (itr->is_root && itr->fsdata->fatsize != 32) {
747 sect = clust_to_sect(itr->fsdata, itr->clust);
748 if (sect - itr->fsdata->rootdir_sect >=
749 itr->fsdata->rootdir_size) {
750 debug("cursect: 0x%x\n", itr->clust);
751 itr->last_cluster = 1;
754 itr->clust = get_fatent(itr->fsdata, itr->clust);
755 if (CHECK_CLUST(itr->clust, itr->fsdata->fatsize)) {
756 debug("cursect: 0x%x\n", itr->clust);
757 itr->last_cluster = 1;
764 static dir_entry *next_dent(fat_itr *itr)
766 if (itr->remaining == 0) {
767 struct dir_entry *dent = next_cluster(itr);
768 unsigned nbytes = itr->fsdata->sect_size *
769 itr->fsdata->clust_size;
771 /* have we reached the last cluster? */
775 itr->remaining = nbytes / sizeof(dir_entry) - 1;
782 /* have we reached the last valid entry? */
783 if (itr->dent->name[0] == 0)
789 static dir_entry *extract_vfat_name(fat_itr *itr)
791 struct dir_entry *dent = itr->dent;
792 int seqn = itr->dent->name[0] & ~LAST_LONG_ENTRY_MASK;
793 u8 chksum, alias_checksum = ((dir_slot *)dent)->alias_checksum;
800 slot2str((dir_slot *)dent, buf, &idx);
802 /* shift accumulated long-name up and copy new part in: */
803 memmove(itr->l_name + idx, itr->l_name, n);
804 memcpy(itr->l_name, buf, idx);
807 dent = next_dent(itr);
812 itr->l_name[n] = '\0';
814 chksum = mkcksum(dent->name, dent->ext);
816 /* checksum mismatch could mean deleted file, etc.. skip it: */
817 if (chksum != alias_checksum) {
818 debug("** chksum=%x, alias_checksum=%x, l_name=%s, s_name=%8s.%3s\n",
819 chksum, alias_checksum, itr->l_name, dent->name, dent->ext);
827 * fat_itr_next() - step to the next entry in a directory
829 * Must be called once on a new iterator before the cursor is valid.
831 * @itr: the iterator to iterate
832 * @return boolean, 1 if success or 0 if no more entries in the
835 static int fat_itr_next(fat_itr *itr)
842 dent = next_dent(itr);
846 if (dent->name[0] == DELETED_FLAG ||
847 dent->name[0] == aRING)
850 if (dent->attr & ATTR_VOLUME) {
851 if ((dent->attr & ATTR_VFAT) == ATTR_VFAT &&
852 (dent->name[0] & LAST_LONG_ENTRY_MASK)) {
853 dent = extract_vfat_name(itr);
856 itr->name = itr->l_name;
859 /* Volume label or VFAT entry, skip */
867 get_name(dent, itr->s_name);
869 itr->name = itr->s_name;
875 * fat_itr_isdir() - is current cursor position pointing to a directory
878 * @return true if cursor is at a directory
880 static int fat_itr_isdir(fat_itr *itr)
882 return !!(itr->dent->attr & ATTR_DIR);
889 #define TYPE_FILE 0x1
891 #define TYPE_ANY (TYPE_FILE | TYPE_DIR)
894 * fat_itr_resolve() - traverse directory structure to resolve the
897 * Traverse directory structure to the requested path. If the specified
898 * path is to a directory, this will descend into the directory and
899 * leave it iterator at the start of the directory. If the path is to a
900 * file, it will leave the iterator in the parent directory with current
901 * cursor at file's entry in the directory.
903 * @itr: iterator initialized to root
904 * @path: the requested path
905 * @type: bitmask of allowable file types
906 * @return 0 on success or -errno
908 static int fat_itr_resolve(fat_itr *itr, const char *path, unsigned type)
912 /* chomp any extra leading slashes: */
913 while (path[0] && ISDIRDELIM(path[0]))
916 /* are we at the end? */
917 if (strlen(path) == 0) {
918 if (!(type & TYPE_DIR))
923 /* find length of next path entry: */
925 while (next[0] && !ISDIRDELIM(next[0]))
928 while (fat_itr_next(itr)) {
930 unsigned n = max(strlen(itr->name), (size_t)(next - path));
932 /* check both long and short name: */
933 if (!strncasecmp(path, itr->name, n))
935 else if (itr->name != itr->s_name &&
936 !strncasecmp(path, itr->s_name, n))
942 if (fat_itr_isdir(itr)) {
943 /* recurse into directory: */
944 fat_itr_child(itr, itr);
945 return fat_itr_resolve(itr, next, type);
946 } else if (next[0]) {
948 * If next is not empty then we have a case
949 * like: /path/to/realfile/nonsense
951 debug("bad trailing path: %s\n", next);
953 } else if (!(type & TYPE_FILE)) {
963 int file_fat_detectfs(void)
970 if (cur_dev == NULL) {
971 printf("No current device\n");
975 #if defined(CONFIG_IDE) || \
976 defined(CONFIG_SATA) || \
977 defined(CONFIG_SCSI) || \
978 defined(CONFIG_CMD_USB) || \
980 printf("Interface: ");
981 switch (cur_dev->if_type) {
1007 printf("\n Device %d: ", cur_dev->devnum);
1011 if (read_bootsectandvi(&bs, &volinfo, &fatsize)) {
1012 printf("\nNo valid FAT fs found\n");
1016 memcpy(vol_label, volinfo.volume_label, 11);
1017 vol_label[11] = '\0';
1018 volinfo.fs_type[5] = '\0';
1020 printf("Filesystem: %s \"%s\"\n", volinfo.fs_type, vol_label);
1025 int fat_exists(const char *filename)
1031 itr = malloc_cache_aligned(sizeof(fat_itr));
1034 ret = fat_itr_root(itr, &fsdata);
1038 ret = fat_itr_resolve(itr, filename, TYPE_ANY);
1039 free(fsdata.fatbuf);
1045 int fat_size(const char *filename, loff_t *size)
1051 itr = malloc_cache_aligned(sizeof(fat_itr));
1054 ret = fat_itr_root(itr, &fsdata);
1058 ret = fat_itr_resolve(itr, filename, TYPE_FILE);
1061 * Directories don't have size, but fs_size() is not
1062 * expected to fail if passed a directory path:
1064 free(fsdata.fatbuf);
1065 fat_itr_root(itr, &fsdata);
1066 if (!fat_itr_resolve(itr, filename, TYPE_DIR)) {
1073 *size = FAT2CPU32(itr->dent->size);
1075 free(fsdata.fatbuf);
1081 int file_fat_read_at(const char *filename, loff_t pos, void *buffer,
1082 loff_t maxsize, loff_t *actread)
1088 itr = malloc_cache_aligned(sizeof(fat_itr));
1091 ret = fat_itr_root(itr, &fsdata);
1095 ret = fat_itr_resolve(itr, filename, TYPE_FILE);
1099 debug("reading %s\n", filename);
1100 ret = get_contents(&fsdata, itr->dent, pos, buffer, maxsize, actread);
1103 free(fsdata.fatbuf);
1109 int file_fat_read(const char *filename, void *buffer, int maxsize)
1114 ret = file_fat_read_at(filename, 0, buffer, maxsize, &actread);
1121 int fat_read_file(const char *filename, void *buf, loff_t offset, loff_t len,
1126 ret = file_fat_read_at(filename, offset, buf, len, actread);
1128 printf("** Unable to read file %s **\n", filename);
1134 struct fs_dir_stream parent;
1135 struct fs_dirent dirent;
1140 int fat_opendir(const char *filename, struct fs_dir_stream **dirsp)
1145 dir = malloc_cache_aligned(sizeof(*dir));
1148 memset(dir, 0, sizeof(*dir));
1150 ret = fat_itr_root(&dir->itr, &dir->fsdata);
1154 ret = fat_itr_resolve(&dir->itr, filename, TYPE_DIR);
1156 goto fail_free_both;
1158 *dirsp = (struct fs_dir_stream *)dir;
1162 free(dir->fsdata.fatbuf);
1168 int fat_readdir(struct fs_dir_stream *dirs, struct fs_dirent **dentp)
1170 fat_dir *dir = (fat_dir *)dirs;
1171 struct fs_dirent *dent = &dir->dirent;
1173 if (!fat_itr_next(&dir->itr))
1176 memset(dent, 0, sizeof(*dent));
1177 strcpy(dent->name, dir->itr.name);
1179 if (fat_itr_isdir(&dir->itr)) {
1180 dent->type = FS_DT_DIR;
1182 dent->type = FS_DT_REG;
1183 dent->size = FAT2CPU32(dir->itr.dent->size);
1191 void fat_closedir(struct fs_dir_stream *dirs)
1193 fat_dir *dir = (fat_dir *)dirs;
1194 free(dir->fsdata.fatbuf);
1198 void fat_close(void)