4 * R/W (V)FAT 12/16/32 filesystem implementation by Donggeun Kim
6 * See file CREDITS for list of people who contributed to this
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 #include <asm/byteorder.h>
33 static void uppercase(char *str, int len)
37 for (i = 0; i < len; i++) {
43 static int total_sector;
44 static int disk_write(__u32 block, __u32 nr_blocks, void *buf)
46 if (!cur_dev || !cur_dev->block_write)
49 if (cur_part_info.start + block + nr_blocks >
50 cur_part_info.start + total_sector) {
51 printf("error: overflow occurs\n");
55 return cur_dev->block_write(cur_dev->dev,
56 cur_part_info.start + block, nr_blocks, buf);
60 * Set short name in directory entry
62 static void set_name(dir_entry *dirent, const char *filename)
64 char s_name[VFAT_MAXLEN_BYTES];
66 int period_location, len, i, ext_num;
71 len = strlen(filename);
75 memcpy(s_name, filename, len);
76 uppercase(s_name, len);
78 period = strchr(s_name, '.');
80 period_location = len;
83 period_location = period - s_name;
84 ext_num = len - period_location - 1;
87 /* Pad spaces when the length of file name is shorter than eight */
88 if (period_location < 8) {
89 memcpy(dirent->name, s_name, period_location);
90 for (i = period_location; i < 8; i++)
91 dirent->name[i] = ' ';
92 } else if (period_location == 8) {
93 memcpy(dirent->name, s_name, period_location);
95 memcpy(dirent->name, s_name, 6);
96 dirent->name[6] = '~';
97 dirent->name[7] = '1';
101 memcpy(dirent->ext, s_name + period_location + 1, ext_num);
102 for (i = ext_num; i < 3; i++)
103 dirent->ext[i] = ' ';
105 memcpy(dirent->ext, s_name + period_location + 1, 3);
107 debug("name : %s\n", dirent->name);
108 debug("ext : %s\n", dirent->ext);
111 static __u8 num_of_fats;
113 * Write fat buffer into block device
115 static int flush_fat_buffer(fsdata *mydata)
117 int getsize = FATBUFBLOCKS;
118 __u32 fatlength = mydata->fatlength;
119 __u8 *bufptr = mydata->fatbuf;
120 __u32 startblock = mydata->fatbufnum * FATBUFBLOCKS;
122 fatlength *= mydata->sect_size;
123 startblock += mydata->fat_sect;
125 if (getsize > fatlength)
129 if (disk_write(startblock, getsize, bufptr) < 0) {
130 debug("error: writing FAT blocks\n");
134 if (num_of_fats == 2) {
135 /* Update corresponding second FAT blocks */
136 startblock += mydata->fatlength;
137 if (disk_write(startblock, getsize, bufptr) < 0) {
138 debug("error: writing second FAT blocks\n");
147 * Get the entry at index 'entry' in a FAT (12/16/32) table.
148 * On failure 0x00 is returned.
149 * When bufnum is changed, write back the previous fatbuf to the disk.
151 static __u32 get_fatent_value(fsdata *mydata, __u32 entry)
158 switch (mydata->fatsize) {
160 bufnum = entry / FAT32BUFSIZE;
161 offset = entry - bufnum * FAT32BUFSIZE;
164 bufnum = entry / FAT16BUFSIZE;
165 offset = entry - bufnum * FAT16BUFSIZE;
168 bufnum = entry / FAT12BUFSIZE;
169 offset = entry - bufnum * FAT12BUFSIZE;
173 /* Unsupported FAT size */
177 debug("FAT%d: entry: 0x%04x = %d, offset: 0x%04x = %d\n",
178 mydata->fatsize, entry, entry, offset, offset);
180 /* Read a new block of FAT entries into the cache. */
181 if (bufnum != mydata->fatbufnum) {
182 int getsize = FATBUFBLOCKS;
183 __u8 *bufptr = mydata->fatbuf;
184 __u32 fatlength = mydata->fatlength;
185 __u32 startblock = bufnum * FATBUFBLOCKS;
187 if (getsize > fatlength)
190 fatlength *= mydata->sect_size; /* We want it in bytes now */
191 startblock += mydata->fat_sect; /* Offset from start of disk */
193 /* Write back the fatbuf to the disk */
194 if (mydata->fatbufnum != -1) {
195 if (flush_fat_buffer(mydata) < 0)
199 if (disk_read(startblock, getsize, bufptr) < 0) {
200 debug("Error reading FAT blocks\n");
203 mydata->fatbufnum = bufnum;
206 /* Get the actual entry from the table */
207 switch (mydata->fatsize) {
209 ret = FAT2CPU32(((__u32 *) mydata->fatbuf)[offset]);
212 ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[offset]);
215 off16 = (offset * 3) / 4;
217 switch (offset & 0x3) {
219 ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[off16]);
223 val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
225 val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]);
227 ret = (val2 << 4) | (val1 >> 12);
230 val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
232 val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]);
234 ret = (val2 << 8) | (val1 >> 8);
237 ret = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
238 ret = (ret & 0xfff0) >> 4;
245 debug("FAT%d: ret: %08x, entry: %08x, offset: %04x\n",
246 mydata->fatsize, ret, entry, offset);
251 #ifdef CONFIG_SUPPORT_VFAT
253 * Set the file name information from 'name' into 'slotptr',
255 static int str2slot(dir_slot *slotptr, const char *name, int *idx)
259 for (j = 0; j <= 8; j += 2) {
260 if (name[*idx] == 0x00) {
261 slotptr->name0_4[j] = 0;
262 slotptr->name0_4[j + 1] = 0;
266 slotptr->name0_4[j] = name[*idx];
270 for (j = 0; j <= 10; j += 2) {
271 if (name[*idx] == 0x00) {
272 slotptr->name5_10[j] = 0;
273 slotptr->name5_10[j + 1] = 0;
277 slotptr->name5_10[j] = name[*idx];
281 for (j = 0; j <= 2; j += 2) {
282 if (name[*idx] == 0x00) {
283 slotptr->name11_12[j] = 0;
284 slotptr->name11_12[j + 1] = 0;
288 slotptr->name11_12[j] = name[*idx];
293 if (name[*idx] == 0x00)
297 /* Not used characters are filled with 0xff 0xff */
299 for (; end_idx < 5; end_idx++) {
300 slotptr->name0_4[end_idx * 2] = 0xff;
301 slotptr->name0_4[end_idx * 2 + 1] = 0xff;
306 for (; end_idx < 6; end_idx++) {
307 slotptr->name5_10[end_idx * 2] = 0xff;
308 slotptr->name5_10[end_idx * 2 + 1] = 0xff;
313 for (; end_idx < 2; end_idx++) {
314 slotptr->name11_12[end_idx * 2] = 0xff;
315 slotptr->name11_12[end_idx * 2 + 1] = 0xff;
321 static int is_next_clust(fsdata *mydata, dir_entry *dentptr);
322 static void flush_dir_table(fsdata *mydata, dir_entry **dentptr);
325 * Fill dir_slot entries with appropriate name, id, and attr
326 * The real directory entry is returned by 'dentptr'
329 fill_dir_slot(fsdata *mydata, dir_entry **dentptr, const char *l_name)
331 dir_slot *slotptr = (dir_slot *)get_contents_vfatname_block;
332 __u8 counter = 0, checksum;
336 /* Get short file name and checksum value */
337 strncpy(s_name, (*dentptr)->name, 16);
338 checksum = mkcksum((*dentptr)->name, (*dentptr)->ext);
341 memset(slotptr, 0x00, sizeof(dir_slot));
342 ret = str2slot(slotptr, l_name, &idx);
343 slotptr->id = ++counter;
344 slotptr->attr = ATTR_VFAT;
345 slotptr->alias_checksum = checksum;
350 slotptr->id |= LAST_LONG_ENTRY_MASK;
352 while (counter >= 1) {
353 if (is_next_clust(mydata, *dentptr)) {
354 /* A new cluster is allocated for directory table */
355 flush_dir_table(mydata, dentptr);
357 memcpy(*dentptr, slotptr, sizeof(dir_slot));
363 if (is_next_clust(mydata, *dentptr)) {
364 /* A new cluster is allocated for directory table */
365 flush_dir_table(mydata, dentptr);
369 static __u32 dir_curclust;
372 * Extract the full long filename starting at 'retdent' (which is really
373 * a slot) into 'l_name'. If successful also copy the real directory entry
375 * If additional adjacent cluster for directory entries is read into memory,
376 * then 'get_contents_vfatname_block' is copied into 'get_dentfromdir_block' and
377 * the location of the real directory entry is returned by 'retdent'
378 * Return 0 on success, -1 otherwise.
381 get_long_file_name(fsdata *mydata, int curclust, __u8 *cluster,
382 dir_entry **retdent, char *l_name)
385 dir_slot *slotptr = (dir_slot *)(*retdent);
386 dir_slot *slotptr2 = NULL;
387 __u8 *buflimit = cluster + mydata->sect_size * ((curclust == 0) ?
390 __u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff;
391 int idx = 0, cur_position = 0;
393 if (counter > VFAT_MAXSEQ) {
394 debug("Error: VFAT name is too long\n");
398 while ((__u8 *)slotptr < buflimit) {
401 if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter)
407 if ((__u8 *)slotptr >= buflimit) {
410 curclust = get_fatent_value(mydata, dir_curclust);
411 if (CHECK_CLUST(curclust, mydata->fatsize)) {
412 debug("curclust: 0x%x\n", curclust);
413 printf("Invalid FAT entry\n");
417 dir_curclust = curclust;
419 if (get_cluster(mydata, curclust, get_contents_vfatname_block,
420 mydata->clust_size * mydata->sect_size) != 0) {
421 debug("Error: reading directory block\n");
425 slotptr2 = (dir_slot *)get_contents_vfatname_block;
426 while (counter > 0) {
427 if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK)
434 /* Save the real directory entry */
435 realdent = (dir_entry *)slotptr2;
436 while ((__u8 *)slotptr2 > get_contents_vfatname_block) {
438 slot2str(slotptr2, l_name, &idx);
441 /* Save the real directory entry */
442 realdent = (dir_entry *)slotptr;
447 if (slot2str(slotptr, l_name, &idx))
449 } while (!(slotptr->id & LAST_LONG_ENTRY_MASK));
452 if (*l_name == DELETED_FLAG)
454 else if (*l_name == aRING)
455 *l_name = DELETED_FLAG;
458 /* Return the real directory entry */
462 memcpy(get_dentfromdir_block, get_contents_vfatname_block,
463 mydata->clust_size * mydata->sect_size);
464 cur_position = (__u8 *)realdent - get_contents_vfatname_block;
465 *retdent = (dir_entry *) &get_dentfromdir_block[cur_position];
474 * Set the entry at index 'entry' in a FAT (16/32) table.
476 static int set_fatent_value(fsdata *mydata, __u32 entry, __u32 entry_value)
478 __u32 bufnum, offset;
480 switch (mydata->fatsize) {
482 bufnum = entry / FAT32BUFSIZE;
483 offset = entry - bufnum * FAT32BUFSIZE;
486 bufnum = entry / FAT16BUFSIZE;
487 offset = entry - bufnum * FAT16BUFSIZE;
490 /* Unsupported FAT size */
494 /* Read a new block of FAT entries into the cache. */
495 if (bufnum != mydata->fatbufnum) {
496 int getsize = FATBUFBLOCKS;
497 __u8 *bufptr = mydata->fatbuf;
498 __u32 fatlength = mydata->fatlength;
499 __u32 startblock = bufnum * FATBUFBLOCKS;
501 fatlength *= mydata->sect_size;
502 startblock += mydata->fat_sect;
504 if (getsize > fatlength)
507 if (mydata->fatbufnum != -1) {
508 if (flush_fat_buffer(mydata) < 0)
512 if (disk_read(startblock, getsize, bufptr) < 0) {
513 debug("Error reading FAT blocks\n");
516 mydata->fatbufnum = bufnum;
519 /* Set the actual entry */
520 switch (mydata->fatsize) {
522 ((__u32 *) mydata->fatbuf)[offset] = cpu_to_le32(entry_value);
525 ((__u16 *) mydata->fatbuf)[offset] = cpu_to_le16(entry_value);
535 * Determine the entry value at index 'entry' in a FAT (16/32) table
537 static __u32 determine_fatent(fsdata *mydata, __u32 entry)
539 __u32 next_fat, next_entry = entry + 1;
542 next_fat = get_fatent_value(mydata, next_entry);
544 set_fatent_value(mydata, entry, next_entry);
549 debug("FAT%d: entry: %08x, entry_value: %04x\n",
550 mydata->fatsize, entry, next_entry);
556 * Write at most 'size' bytes from 'buffer' into the specified cluster.
557 * Return 0 on success, -1 otherwise.
560 set_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer,
567 startsect = mydata->data_begin +
568 clustnum * mydata->clust_size;
570 startsect = mydata->rootdir_sect;
572 debug("clustnum: %d, startsect: %d\n", clustnum, startsect);
574 if (disk_write(startsect, size / mydata->sect_size, buffer) < 0) {
575 debug("Error writing data\n");
579 if (size % mydata->sect_size) {
580 __u8 tmpbuf[mydata->sect_size];
582 idx = size / mydata->sect_size;
583 buffer += idx * mydata->sect_size;
584 memcpy(tmpbuf, buffer, size % mydata->sect_size);
586 if (disk_write(startsect + idx, 1, tmpbuf) < 0) {
587 debug("Error writing data\n");
598 * Find the first empty cluster
600 static int find_empty_cluster(fsdata *mydata)
602 __u32 fat_val, entry = 3;
605 fat_val = get_fatent_value(mydata, entry);
615 * Write directory entries in 'get_dentfromdir_block' to block device
617 static void flush_dir_table(fsdata *mydata, dir_entry **dentptr)
619 int dir_newclust = 0;
621 if (set_cluster(mydata, dir_curclust,
622 get_dentfromdir_block,
623 mydata->clust_size * mydata->sect_size) != 0) {
624 printf("error: wrinting directory entry\n");
627 dir_newclust = find_empty_cluster(mydata);
628 set_fatent_value(mydata, dir_curclust, dir_newclust);
629 if (mydata->fatsize == 32)
630 set_fatent_value(mydata, dir_newclust, 0xffffff8);
631 else if (mydata->fatsize == 16)
632 set_fatent_value(mydata, dir_newclust, 0xfff8);
634 dir_curclust = dir_newclust;
636 if (flush_fat_buffer(mydata) < 0)
639 memset(get_dentfromdir_block, 0x00,
640 mydata->clust_size * mydata->sect_size);
642 *dentptr = (dir_entry *) get_dentfromdir_block;
646 * Set empty cluster from 'entry' to the end of a file
648 static int clear_fatent(fsdata *mydata, __u32 entry)
653 fat_val = get_fatent_value(mydata, entry);
655 set_fatent_value(mydata, entry, 0);
659 if (fat_val == 0xfffffff || fat_val == 0xffff)
665 /* Flush fat buffer */
666 if (flush_fat_buffer(mydata) < 0)
673 * Write at most 'maxsize' bytes from 'buffer' into
674 * the file associated with 'dentptr'
675 * Return the number of bytes read or -1 on fatal errors.
678 set_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer,
679 unsigned long maxsize)
681 unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0;
682 unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;
683 __u32 curclust = START(dentptr);
684 __u32 endclust = 0, newclust = 0;
685 unsigned long actsize;
687 debug("Filesize: %ld bytes\n", filesize);
689 if (maxsize > 0 && filesize > maxsize)
692 debug("%ld bytes\n", filesize);
694 actsize = bytesperclust;
697 /* search for consecutive clusters */
698 while (actsize < filesize) {
699 newclust = determine_fatent(mydata, endclust);
701 if ((newclust - 1) != endclust)
704 if (CHECK_CLUST(newclust, mydata->fatsize)) {
705 debug("curclust: 0x%x\n", newclust);
706 debug("Invalid FAT entry\n");
710 actsize += bytesperclust;
712 /* actsize >= file size */
713 actsize -= bytesperclust;
714 /* set remaining clusters */
715 if (set_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
716 debug("error: writing cluster\n");
720 /* set remaining bytes */
721 gotsize += (int)actsize;
726 if (set_cluster(mydata, endclust, buffer, (int)actsize) != 0) {
727 debug("error: writing cluster\n");
732 /* Mark end of file in FAT */
733 if (mydata->fatsize == 16)
735 else if (mydata->fatsize == 32)
736 newclust = 0xfffffff;
737 set_fatent_value(mydata, endclust, newclust);
741 if (set_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
742 debug("error: writing cluster\n");
745 gotsize += (int)actsize;
749 if (CHECK_CLUST(curclust, mydata->fatsize)) {
750 debug("curclust: 0x%x\n", curclust);
751 debug("Invalid FAT entry\n");
754 actsize = bytesperclust;
755 curclust = endclust = newclust;
762 static void fill_dentry(fsdata *mydata, dir_entry *dentptr,
763 const char *filename, __u32 start_cluster, __u32 size, __u8 attr)
765 if (mydata->fatsize == 32)
767 cpu_to_le16((start_cluster & 0xffff0000) >> 16);
768 dentptr->start = cpu_to_le16(start_cluster & 0xffff);
769 dentptr->size = cpu_to_le32(size);
771 dentptr->attr = attr;
773 set_name(dentptr, filename);
777 * Check whether adding a file makes the file system to
778 * exceed the size of the block device
779 * Return -1 when overflow occurs, otherwise return 0
781 static int check_overflow(fsdata *mydata, __u32 clustnum, unsigned long size)
783 __u32 startsect, sect_num;
786 startsect = mydata->data_begin +
787 clustnum * mydata->clust_size;
789 startsect = mydata->rootdir_sect;
792 sect_num = size / mydata->sect_size;
793 if (size % mydata->sect_size)
796 if (startsect + sect_num > cur_part_info.start + total_sector)
803 * Check if adding several entries exceed one cluster boundary
805 static int is_next_clust(fsdata *mydata, dir_entry *dentptr)
809 cur_position = (__u8 *)dentptr - get_dentfromdir_block;
811 if (cur_position >= mydata->clust_size * mydata->sect_size)
817 static dir_entry *empty_dentptr;
819 * Find a directory entry based on filename or start cluster number
820 * If the directory entry is not found,
821 * the new position for writing a directory entry will be returned
823 static dir_entry *find_directory_entry(fsdata *mydata, int startsect,
824 char *filename, dir_entry *retdent, __u32 start)
826 __u32 curclust = (startsect - mydata->data_begin) / mydata->clust_size;
828 debug("get_dentfromdir: %s\n", filename);
835 if (get_cluster(mydata, curclust, get_dentfromdir_block,
836 mydata->clust_size * mydata->sect_size) != 0) {
837 printf("Error: reading directory block\n");
841 dentptr = (dir_entry *)get_dentfromdir_block;
843 dir_curclust = curclust;
845 for (i = 0; i < DIRENTSPERCLUST; i++) {
846 char s_name[14], l_name[VFAT_MAXLEN_BYTES];
849 if (dentptr->name[0] == DELETED_FLAG) {
851 if (is_next_clust(mydata, dentptr))
855 if ((dentptr->attr & ATTR_VOLUME)) {
856 #ifdef CONFIG_SUPPORT_VFAT
857 if ((dentptr->attr & ATTR_VFAT) &&
858 (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
859 get_long_file_name(mydata, curclust,
860 get_dentfromdir_block,
862 debug("vfatname: |%s|\n", l_name);
866 /* Volume label or VFAT entry */
868 if (is_next_clust(mydata, dentptr))
873 if (dentptr->name[0] == 0) {
874 debug("Dentname == NULL - %d\n", i);
875 empty_dentptr = dentptr;
879 get_name(dentptr, s_name);
881 if (strcmp(filename, s_name)
882 && strcmp(filename, l_name)) {
883 debug("Mismatch: |%s|%s|\n",
886 if (is_next_clust(mydata, dentptr))
891 memcpy(retdent, dentptr, sizeof(dir_entry));
893 debug("DentName: %s", s_name);
894 debug(", start: 0x%x", START(dentptr));
895 debug(", size: 0x%x %s\n",
896 FAT2CPU32(dentptr->size),
897 (dentptr->attr & ATTR_DIR) ?
903 curclust = get_fatent_value(mydata, dir_curclust);
904 if ((curclust >= 0xffffff8) || (curclust >= 0xfff8)) {
905 empty_dentptr = dentptr;
908 if (CHECK_CLUST(curclust, mydata->fatsize)) {
909 debug("curclust: 0x%x\n", curclust);
910 debug("Invalid FAT entry\n");
918 static int do_fat_write(const char *filename, void *buffer,
921 dir_entry *dentptr, *retdent;
927 fsdata *mydata = &datablock;
929 int ret = -1, name_len;
930 char l_filename[VFAT_MAXLEN_BYTES];
931 int write_size = size;
935 if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) {
936 debug("error: reading boot sector\n");
940 total_sector = bs.total_sect;
941 if (total_sector == 0)
942 total_sector = cur_part_info.size;
944 if (mydata->fatsize == 32)
945 mydata->fatlength = bs.fat32_length;
947 mydata->fatlength = bs.fat_length;
949 mydata->fat_sect = bs.reserved;
951 cursect = mydata->rootdir_sect
952 = mydata->fat_sect + mydata->fatlength * bs.fats;
953 num_of_fats = bs.fats;
955 mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0];
956 mydata->clust_size = bs.cluster_size;
958 if (mydata->fatsize == 32) {
959 mydata->data_begin = mydata->rootdir_sect -
960 (mydata->clust_size * 2);
964 rootdir_size = ((bs.dir_entries[1] * (int)256 +
968 mydata->data_begin = mydata->rootdir_sect +
970 (mydata->clust_size * 2);
973 mydata->fatbufnum = -1;
974 mydata->fatbuf = malloc(FATBUFSIZE);
975 if (mydata->fatbuf == NULL) {
976 debug("Error: allocating memory\n");
980 if (disk_read(cursect,
981 (mydata->fatsize == 32) ?
982 (mydata->clust_size) :
983 PREFETCH_BLOCKS, do_fat_read_at_block) < 0) {
984 debug("Error: reading rootdir block\n");
987 dentptr = (dir_entry *) do_fat_read_at_block;
989 name_len = strlen(filename);
990 if (name_len >= VFAT_MAXLEN_BYTES)
991 name_len = VFAT_MAXLEN_BYTES - 1;
993 memcpy(l_filename, filename, name_len);
994 l_filename[name_len] = 0; /* terminate the string */
995 downcase(l_filename);
997 startsect = mydata->rootdir_sect;
998 retdent = find_directory_entry(mydata, startsect,
999 l_filename, dentptr, 0);
1001 /* Update file size and start_cluster in a directory entry */
1002 retdent->size = cpu_to_le32(size);
1003 start_cluster = FAT2CPU16(retdent->start);
1004 if (mydata->fatsize == 32)
1006 (FAT2CPU16(retdent->starthi) << 16);
1008 ret = check_overflow(mydata, start_cluster, size);
1010 printf("Error: %ld overflow\n", size);
1014 ret = clear_fatent(mydata, start_cluster);
1016 printf("Error: clearing FAT entries\n");
1020 ret = set_contents(mydata, retdent, buffer, size);
1022 printf("Error: writing contents\n");
1026 debug("attempt to write 0x%x bytes\n", write_size);
1028 /* Flush fat buffer */
1029 ret = flush_fat_buffer(mydata);
1031 printf("Error: flush fat buffer\n");
1035 /* Write directory table to device */
1036 ret = set_cluster(mydata, dir_curclust,
1037 get_dentfromdir_block,
1038 mydata->clust_size * mydata->sect_size);
1040 printf("Error: writing directory entry\n");
1044 /* Set short name to set alias checksum field in dir_slot */
1045 set_name(empty_dentptr, filename);
1046 fill_dir_slot(mydata, &empty_dentptr, filename);
1048 ret = start_cluster = find_empty_cluster(mydata);
1050 printf("Error: finding empty cluster\n");
1054 ret = check_overflow(mydata, start_cluster, size);
1056 printf("Error: %ld overflow\n", size);
1060 /* Set attribute as archieve for regular file */
1061 fill_dentry(mydata, empty_dentptr, filename,
1062 start_cluster, size, 0x20);
1064 ret = set_contents(mydata, empty_dentptr, buffer, size);
1066 printf("Error: writing contents\n");
1070 debug("attempt to write 0x%x bytes\n", write_size);
1072 /* Flush fat buffer */
1073 ret = flush_fat_buffer(mydata);
1075 printf("Error: flush fat buffer\n");
1079 /* Write directory table to device */
1080 ret = set_cluster(mydata, dir_curclust,
1081 get_dentfromdir_block,
1082 mydata->clust_size * mydata->sect_size);
1084 printf("Error: writing directory entry\n");
1090 free(mydata->fatbuf);
1091 return ret < 0 ? ret : write_size;
1094 int file_fat_write(const char *filename, void *buffer, unsigned long maxsize)
1096 printf("writing %s\n", filename);
1097 return do_fat_write(filename, buffer, maxsize);