diff options
author | wdenk <wdenk> | 2003-06-15 22:40:42 (GMT) |
---|---|---|
committer | wdenk <wdenk> | 2003-06-15 22:40:42 (GMT) |
commit | 71f9511803de65a3b98d2f592d418da1d1539f13 (patch) | |
tree | 4be38a22fc4f588a80aa8cc350ecd5617a211389 /fs/fat/fat.c | |
parent | 487778b781257831aa9b9140dd3c7ad4176e8314 (diff) | |
download | u-boot-71f9511803de65a3b98d2f592d418da1d1539f13.tar.xz |
* Fix CONFIG_NET_MULTI support in include/net.h
* Patches by Kyle Harris, 13 Mar 2003:
- Add FAT partition support
- Add command support for FAT
- Add command support for MMC
----
- Add Intel PXA support for video
- Add Intel PXA support for MMC
----
- Enable MMC and FAT for lubbock board
- Other misc changes for lubbock board
Diffstat (limited to 'fs/fat/fat.c')
-rw-r--r-- | fs/fat/fat.c | 901 |
1 files changed, 901 insertions, 0 deletions
diff --git a/fs/fat/fat.c b/fs/fat/fat.c new file mode 100644 index 0000000..9f01567 --- /dev/null +++ b/fs/fat/fat.c @@ -0,0 +1,901 @@ +/* + * fat.c + * + * R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg + * + * 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6 + * 2003-03-10 - kharris@nexus-tech.net - ported to uboot + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <config.h> +#include <fat.h> +#include <asm/byteorder.h> + +#if (CONFIG_COMMANDS & CFG_CMD_FAT) + +/* + * Convert a string to lowercase. + */ +static void +downcase(char *str) +{ + while (*str != '\0') { + TOLOWER(*str); + str++; + } +} + +int (*dev_block_read)(int device, __u32 blknr, __u32 blkcnt, __u8 *buffer) = 0; + +int disk_read (__u32 startblock, __u32 getsize, __u8 * bufptr) +{ + /* FIXME we need to determine the start block of the + * partition where the DOS FS resides + */ + startblock += 32; + + if (dev_block_read) { + return dev_block_read (0, startblock, getsize, bufptr); + } + return -1; +} + + +int +fat_register_read (int (*block_read)(int, __u32, __u32, __u8 *)) +{ + dev_block_read = block_read; + return 0; +} + + +/* + * Get the first occurence of a directory delimiter ('/' or '\') in a string. + * Return index into string if found, -1 otherwise. + */ +static int +dirdelim(char *str) +{ + char *start = str; + + while (*str != '\0') { + if (ISDIRDELIM(*str)) return str - start; + str++; + } + return -1; +} + + +/* + * Match volume_info fs_type strings. + * Return 0 on match, -1 otherwise. + */ +static int +compare_sign(char *str1, char *str2) +{ + char *end = str1+SIGNLEN; + + while (str1 != end) { + if (*str1 != *str2) { + return -1; + } + str1++; + str2++; + } + + return 0; +} + + +/* + * Extract zero terminated short name from a directory entry. + */ +static void get_name (dir_entry *dirent, char *s_name) +{ + char *ptr; + + memcpy (s_name, dirent->name, 8); + s_name[8] = '\0'; + ptr = s_name; + while (*ptr && *ptr != ' ') + ptr++; + if (dirent->ext[0] && dirent->ext[0] != ' ') { + *ptr = '.'; + ptr++; + memcpy (ptr, dirent->ext, 3); + ptr[3] = '\0'; + while (*ptr && *ptr != ' ') + ptr++; + } + *ptr = '\0'; + if (*s_name == DELETED_FLAG) + *s_name = '\0'; + else if (*s_name == aRING) + *s_name = 'å'; + downcase (s_name); +} + +/* + * Get the entry at index 'entry' in a FAT (12/16/32) table. + * On failure 0x00 is returned. + */ +static __u32 +get_fatent(fsdata *mydata, __u32 entry) +{ + __u32 bufnum; + __u32 offset; + __u32 ret = 0x00; + + switch (mydata->fatsize) { + case 32: + bufnum = entry / FAT32BUFSIZE; + offset = entry - bufnum * FAT32BUFSIZE; + break; + case 16: + bufnum = entry / FAT16BUFSIZE; + offset = entry - bufnum * FAT16BUFSIZE; + break; + case 12: + bufnum = entry / FAT12BUFSIZE; + offset = entry - bufnum * FAT12BUFSIZE; + break; + + default: + /* Unsupported FAT size */ + return ret; + } + + /* Read a new block of FAT entries into the cache. */ + if (bufnum != mydata->fatbufnum) { + int getsize = FATBUFSIZE/FS_BLOCK_SIZE; + __u8 *bufptr = mydata->fatbuf; + __u32 fatlength = mydata->fatlength; + __u32 startblock = bufnum * FATBUFBLOCKS; + + fatlength *= SECTOR_SIZE; /* We want it in bytes now */ + startblock += mydata->fat_sect; /* Offset from start of disk */ + + if (getsize > fatlength) getsize = fatlength; + if (disk_read(startblock, getsize, bufptr) < 0) { + FAT_DPRINT("Error reading FAT blocks\n"); + return ret; + } + mydata->fatbufnum = bufnum; + } + + /* Get the actual entry from the table */ + switch (mydata->fatsize) { + case 32: + ret = FAT2CPU32(((__u32*)mydata->fatbuf)[offset]); + break; + case 16: + ret = FAT2CPU16(((__u16*)mydata->fatbuf)[offset]); + break; + case 12: { + __u32 off16 = (offset*3)/4; + __u16 val1, val2; + + switch (offset & 0x3) { + case 0: + ret = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]); + ret &= 0xfff; + break; + case 1: + val1 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]); + val1 &= 0xf000; + val2 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16+1]); + val2 &= 0x00ff; + ret = (val2 << 4) | (val1 >> 12); + break; + case 2: + val1 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]); + val1 &= 0xff00; + val2 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16+1]); + val2 &= 0x000f; + ret = (val2 << 8) | (val1 >> 8); + break; + case 3: + ret = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);; + ret = (ret & 0xfff0) >> 4; + break; + default: + break; + } + } + break; + } + FAT_DPRINT("ret: %d, offset: %d\n", ret, offset); + + return ret; +} + + +/* + * Read at most 'size' bytes from the specified cluster into 'buffer'. + * Return 0 on success, -1 otherwise. + */ +static int +get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size) +{ + int idx = 0; + __u32 startsect; + + if (clustnum > 0) { + startsect = mydata->data_begin + clustnum*mydata->clust_size; + } else { + startsect = mydata->rootdir_sect; + } + + FAT_DPRINT("gc - clustnum: %d, startsect: %d\n", clustnum, startsect); + while (size > 0) { + if (size >= FS_BLOCK_SIZE) { + if (disk_read(startsect + idx, 1, buffer) < 0) { + FAT_DPRINT("Error reading data\n"); + return -1; + } + } else { + __u8 tmpbuf[FS_BLOCK_SIZE]; + if (disk_read(startsect + idx, 1, tmpbuf) < 0) { + FAT_DPRINT("Error reading data\n"); + return -1; + } + memcpy(buffer, tmpbuf, size); + + return 0; + } + buffer += FS_BLOCK_SIZE; + size -= FS_BLOCK_SIZE; + idx++; + } + + return 0; +} + + +/* + * Read at most 'maxsize' bytes from the file associated with 'dentptr' + * into 'buffer'. + * Return the number of bytes read or -1 on fatal errors. + */ +static long +get_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer, + unsigned long maxsize) +{ + unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0; + unsigned int bytesperclust = mydata->clust_size * SECTOR_SIZE; + __u32 curclust = START(dentptr); + + FAT_DPRINT("Filesize: %ld bytes\n", filesize); + + if (maxsize > 0 && filesize > maxsize) filesize = maxsize; + + FAT_DPRINT("Reading: %ld bytes\n", filesize); + + do { + int getsize = (filesize > bytesperclust) ? bytesperclust : + filesize; + + if (get_cluster(mydata, curclust, buffer, getsize) != 0) { + FAT_ERROR("Error reading cluster\n"); + return -1; + } + gotsize += getsize; + filesize -= getsize; + if (filesize <= 0) return gotsize; + buffer += getsize; + + curclust = get_fatent(mydata, curclust); + if (curclust <= 0x0001 || curclust >= 0xfff0) { + FAT_DPRINT("curclust: 0x%x\n", curclust); + FAT_ERROR("Invalid FAT entry\n"); + return gotsize; + } + } while (1); +} + + +#ifdef CONFIG_SUPPORT_VFAT +/* + * Extract the file name information from 'slotptr' into 'l_name', + * starting at l_name[*idx]. + * Return 1 if terminator (zero byte) is found, 0 otherwise. + */ +static int +slot2str(dir_slot *slotptr, char *l_name, int *idx) +{ + int j; + + for (j = 0; j <= 8; j += 2) { + l_name[*idx] = slotptr->name0_4[j]; + if (l_name[*idx] == 0x00) return 1; + (*idx)++; + } + for (j = 0; j <= 10; j += 2) { + l_name[*idx] = slotptr->name5_10[j]; + if (l_name[*idx] == 0x00) return 1; + (*idx)++; + } + for (j = 0; j <= 2; j += 2) { + l_name[*idx] = slotptr->name11_12[j]; + if (l_name[*idx] == 0x00) return 1; + (*idx)++; + } + + return 0; +} + + +/* + * Extract the full long filename starting at 'retdent' (which is really + * a slot) into 'l_name'. If successful also copy the real directory entry + * into 'retdent' + * Return 0 on success, -1 otherwise. + */ +static int +get_vfatname(fsdata *mydata, int curclust, __u8 *cluster, + dir_entry *retdent, char *l_name) +{ + dir_entry *realdent; + dir_slot *slotptr = (dir_slot*) retdent; + __u8 *nextclust = cluster + mydata->clust_size * SECTOR_SIZE; + __u8 counter = slotptr->id & 0xf; + int idx = 0; + + while ((__u8*)slotptr < nextclust) { + if (counter == 0) break; + if ((slotptr->id & 0x0f) != counter) return -1; + slotptr++; + counter--; + } + + if ((__u8*)slotptr >= nextclust) { + __u8 block[MAX_CLUSTSIZE]; + dir_slot *slotptr2; + + slotptr--; + curclust = get_fatent(mydata, curclust); + if (curclust <= 0x0001 || curclust >= 0xfff0) { + FAT_DPRINT("curclust: 0x%x\n", curclust); + FAT_ERROR("Invalid FAT entry\n"); + return -1; + } + if (get_cluster(mydata, curclust, block, + mydata->clust_size * SECTOR_SIZE) != 0) { + FAT_DPRINT("Error: reading directory block\n"); + return -1; + } + slotptr2 = (dir_slot*) block; + while (slotptr2->id > 0x01) { + slotptr2++; + } + /* Save the real directory entry */ + realdent = (dir_entry*)slotptr2 + 1; + while ((__u8*)slotptr2 >= block) { + slot2str(slotptr2, l_name, &idx); + slotptr2--; + } + } else { + /* Save the real directory entry */ + realdent = (dir_entry*)slotptr; + } + + do { + slotptr--; + if (slot2str(slotptr, l_name, &idx)) break; + } while (!(slotptr->id & 0x40)); + + l_name[idx] = '\0'; + if (*l_name == DELETED_FLAG) *l_name = '\0'; + else if (*l_name == aRING) *l_name = 'å'; + downcase(l_name); + + /* Return the real directory entry */ + memcpy(retdent, realdent, sizeof(dir_entry)); + + return 0; +} + + +/* Calculate short name checksum */ +static __u8 +mkcksum(const char *str) +{ + int i; + __u8 ret = 0; + + for (i = 0; i < 11; i++) { + ret = (((ret&1)<<7)|((ret&0xfe)>>1)) + str[i]; + } + + return ret; +} +#endif + + +/* + * Get the directory entry associated with 'filename' from the directory + * starting at 'startsect' + */ +static dir_entry *get_dentfromdir (fsdata * mydata, int startsect, + char *filename, dir_entry * retdent, + int dols) +{ + __u16 prevcksum = 0xffff; + __u8 block[MAX_CLUSTSIZE]; + __u32 curclust = START (retdent); + int files = 0, dirs = 0; + + FAT_DPRINT ("get_dentfromdir: %s\n", filename); + while (1) { + dir_entry *dentptr; + int i; + + if (get_cluster (mydata, curclust, block, + mydata->clust_size * SECTOR_SIZE) != 0) { + FAT_DPRINT ("Error: reading directory block\n"); + return NULL; + } + dentptr = (dir_entry *) block; + for (i = 0; i < DIRENTSPERCLUST; i++) { + char s_name[14], l_name[256]; + + l_name[0] = '\0'; + if ((dentptr->attr & ATTR_VOLUME)) { +#ifdef CONFIG_SUPPORT_VFAT + if ((dentptr->attr & ATTR_VFAT) && + (dentptr->name[0] & 0x40)) { + prevcksum = ((dir_slot *) dentptr) + ->alias_checksum; + get_vfatname (mydata, curclust, block, + dentptr, l_name); + if (dols) { + int isdir = (dentptr->attr & ATTR_DIR); + char dirc; + int doit = 0; + + if (isdir) { + dirs++; + dirc = '/'; + doit = 1; + } else { + dirc = ' '; + if (l_name[0] != 0) { + files++; + doit = 1; + } + } + if (doit) { + if (dirc == ' ') { + printf (" %8ld %s%c\n", + (long) FAT2CPU32 (dentptr->size), + l_name, dirc); + } else { + printf (" %s%c\n", l_name, dirc); + } + } + dentptr++; + continue; + } + FAT_DPRINT ("vfatname: |%s|\n", l_name); + } else +#endif + { + /* Volume label or VFAT entry */ + dentptr++; + continue; + } + } + if (dentptr->name[0] == 0) { + if (dols) { + printf ("\n%d file(s), %d dir(s)\n\n", files, dirs); + } + FAT_DPRINT ("Dentname == NULL - %d\n", i); + return NULL; + } +#ifdef CONFIG_SUPPORT_VFAT + if (dols && mkcksum (dentptr->name) == prevcksum) { + dentptr++; + continue; + } +#endif + get_name (dentptr, s_name); + if (dols) { + int isdir = (dentptr->attr & ATTR_DIR); + char dirc; + int doit = 0; + + if (isdir) { + dirs++; + dirc = '/'; + doit = 1; + } else { + dirc = ' '; + if (s_name[0] != 0) { + files++; + doit = 1; + } + } + if (doit) { + if (dirc == ' ') { + printf (" %8ld %s%c\n", + (long) FAT2CPU32 (dentptr->size), s_name, + dirc); + } else { + printf (" %s%c\n", s_name, dirc); + } + } + dentptr++; + continue; + } + if (strcmp (filename, s_name) && strcmp (filename, l_name)) { + FAT_DPRINT ("Mismatch: |%s|%s|\n", s_name, l_name); + dentptr++; + continue; + } + memcpy (retdent, dentptr, sizeof (dir_entry)); + + FAT_DPRINT ("DentName: %s", s_name); + FAT_DPRINT (", start: 0x%x", START (dentptr)); + FAT_DPRINT (", size: 0x%x %s\n", + FAT2CPU32 (dentptr->size), + (dentptr->attr & ATTR_DIR) ? "(DIR)" : ""); + + return retdent; + } + curclust = get_fatent (mydata, curclust); + if (curclust <= 0x0001 || curclust >= 0xfff0) { + FAT_DPRINT ("curclust: 0x%x\n", curclust); + FAT_ERROR ("Invalid FAT entry\n"); + return NULL; + } + } + + return NULL; +} + + +/* + * Read boot sector and volume info from a FAT filesystem + */ +static int +read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize) +{ + __u8 block[FS_BLOCK_SIZE]; + volume_info *vistart; + + if (disk_read(0, 1, block) < 0) { + FAT_DPRINT("Error: reading block\n"); + return -1; + } + + memcpy(bs, block, sizeof(boot_sector)); + bs->reserved = FAT2CPU16(bs->reserved); + bs->fat_length = FAT2CPU16(bs->fat_length); + bs->secs_track = FAT2CPU16(bs->secs_track); + bs->heads = FAT2CPU16(bs->heads); +#if 0 /* UNUSED */ + bs->hidden = FAT2CPU32(bs->hidden); +#endif + bs->total_sect = FAT2CPU32(bs->total_sect); + + /* FAT32 entries */ + if (bs->fat_length == 0) { + /* Assume FAT32 */ + bs->fat32_length = FAT2CPU32(bs->fat32_length); + bs->flags = FAT2CPU16(bs->flags); + bs->root_cluster = FAT2CPU32(bs->root_cluster); + bs->info_sector = FAT2CPU16(bs->info_sector); + bs->backup_boot = FAT2CPU16(bs->backup_boot); + vistart = (volume_info*) (block + sizeof(boot_sector)); + *fatsize = 32; + } else { + vistart = (volume_info*) &(bs->fat32_length); + *fatsize = 0; + } + memcpy(volinfo, vistart, sizeof(volume_info)); + + /* Terminate fs_type string. Writing past the end of vistart + is ok - it's just the buffer. */ + vistart->fs_type[8] = '\0'; + + if (*fatsize == 32) { + if (compare_sign(FAT32_SIGN, vistart->fs_type) == 0) { + return 0; + } + } else { + if (compare_sign(FAT12_SIGN, vistart->fs_type) == 0) { + *fatsize = 12; + return 0; + } + if (compare_sign(FAT16_SIGN, vistart->fs_type) == 0) { + *fatsize = 16; + return 0; + } + } + + FAT_DPRINT("Error: broken fs_type sign\n"); + return -1; +} + + +static long +do_fat_read (const char *filename, void *buffer, unsigned long maxsize, + int dols) +{ + __u8 block[FS_BLOCK_SIZE]; /* Block buffer */ + char fnamecopy[2048]; + boot_sector bs; + volume_info volinfo; + fsdata datablock; + fsdata *mydata = &datablock; + dir_entry *dentptr; + __u16 prevcksum = 0xffff; + char *subname = ""; + int rootdir_size, cursect; + int idx, isdir = 0; + int files = 0, dirs = 0; + long ret = 0; + int firsttime; + + if (read_bootsectandvi (&bs, &volinfo, &mydata->fatsize)) { + FAT_DPRINT ("Error: reading boot sector\n"); + return -1; + } + if (mydata->fatsize == 32) { + mydata->fatlength = bs.fat32_length; + } else { + mydata->fatlength = bs.fat_length; + } + mydata->fat_sect = bs.reserved; + cursect = mydata->rootdir_sect + = mydata->fat_sect + mydata->fatlength * bs.fats; + mydata->clust_size = bs.cluster_size; + if (mydata->fatsize == 32) { + rootdir_size = mydata->clust_size; + mydata->data_begin = mydata->rootdir_sect /* + rootdir_size */ + - (mydata->clust_size * 2); + } else { + rootdir_size = ((bs.dir_entries[1] * (int) 256 + bs.dir_entries[0]) + * sizeof (dir_entry)) / SECTOR_SIZE; + mydata->data_begin = mydata->rootdir_sect + rootdir_size + - (mydata->clust_size * 2); + } + mydata->fatbufnum = -1; + + FAT_DPRINT ("FAT%d, fatlength: %d\n", mydata->fatsize, + mydata->fatlength); + FAT_DPRINT ("Rootdir begins at sector: %d, offset: %x, size: %d\n" + "Data begins at: %d\n", + mydata->rootdir_sect, mydata->rootdir_sect * SECTOR_SIZE, + rootdir_size, mydata->data_begin); + FAT_DPRINT ("Cluster size: %d\n", mydata->clust_size); + + /* "cwd" is always the root... */ + while (ISDIRDELIM (*filename)) + filename++; + /* Make a copy of the filename and convert it to lowercase */ + strcpy (fnamecopy, filename); + downcase (fnamecopy); + if (*fnamecopy == '\0') { + if (!dols) + return -1; + dols = LS_ROOT; + } else if ((idx = dirdelim (fnamecopy)) >= 0) { + isdir = 1; + fnamecopy[idx] = '\0'; + subname = fnamecopy + idx + 1; + /* Handle multiple delimiters */ + while (ISDIRDELIM (*subname)) + subname++; + } else if (dols) { + isdir = 1; + } + + while (1) { + int i; + + if (disk_read (cursect, 1, block) < 0) { + FAT_DPRINT ("Error: reading rootdir block\n"); + return -1; + } + dentptr = (dir_entry *) block; + for (i = 0; i < DIRENTSPERBLOCK; i++) { + char s_name[14], l_name[256]; + + l_name[0] = '\0'; + if ((dentptr->attr & ATTR_VOLUME)) { +#ifdef CONFIG_SUPPORT_VFAT + if ((dentptr->attr & ATTR_VFAT) && + (dentptr->name[0] & 0x40)) { + prevcksum = ((dir_slot *) dentptr)->alias_checksum; + get_vfatname (mydata, 0, block, dentptr, l_name); + if (dols == LS_ROOT) { + int isdir = (dentptr->attr & ATTR_DIR); + char dirc; + int doit = 0; + + if (isdir) { + dirs++; + dirc = '/'; + doit = 1; + } else { + dirc = ' '; + if (l_name[0] != 0) { + files++; + doit = 1; + } + } + if (doit) { + if (dirc == ' ') { + printf (" %8ld %s%c\n", + (long) FAT2CPU32 (dentptr->size), + l_name, dirc); + } else { + printf (" %s%c\n", l_name, dirc); + } + } + dentptr++; + continue; + } + FAT_DPRINT ("Rootvfatname: |%s|\n", l_name); + } else +#endif + { + /* Volume label or VFAT entry */ + dentptr++; + continue; + } + } else if (dentptr->name[0] == 0) { + FAT_DPRINT ("RootDentname == NULL - %d\n", i); + if (dols == LS_ROOT) { + printf ("\n%d file(s), %d dir(s)\n\n", files, dirs); + return 0; + } + return -1; + } +#ifdef CONFIG_SUPPORT_VFAT + else if (dols == LS_ROOT + && mkcksum (dentptr->name) == prevcksum) { + dentptr++; + continue; + } +#endif + get_name (dentptr, s_name); + if (dols == LS_ROOT) { + int isdir = (dentptr->attr & ATTR_DIR); + char dirc; + int doit = 0; + + if (isdir) { + dirs++; + dirc = '/'; + doit = 1; + } else { + dirc = ' '; + if (s_name[0] != 0) { + files++; + doit = 1; + } + } + if (doit) { + if (dirc == ' ') { + printf (" %8ld %s%c\n", + (long) FAT2CPU32 (dentptr->size), s_name, + dirc); + } else { + printf (" %s%c\n", s_name, dirc); + } + } + dentptr++; + continue; + } + if (strcmp (fnamecopy, s_name) && strcmp (fnamecopy, l_name)) { + FAT_DPRINT ("RootMismatch: |%s|%s|\n", s_name, l_name); + dentptr++; + continue; + } + if (isdir && !(dentptr->attr & ATTR_DIR)) + return -1; + + FAT_DPRINT ("RootName: %s", s_name); + FAT_DPRINT (", start: 0x%x", START (dentptr)); + FAT_DPRINT (", size: 0x%x %s\n", + FAT2CPU32 (dentptr->size), isdir ? "(DIR)" : ""); + + goto rootdir_done; /* We got a match */ + } + cursect++; + } + rootdir_done: + + firsttime = 1; + while (isdir) { + int startsect = mydata->data_begin + + START (dentptr) * mydata->clust_size; + dir_entry dent; + char *nextname = NULL; + + dent = *dentptr; + dentptr = &dent; + + idx = dirdelim (subname); + if (idx >= 0) { + subname[idx] = '\0'; + nextname = subname + idx + 1; + /* Handle multiple delimiters */ + while (ISDIRDELIM (*nextname)) + nextname++; + if (dols && *nextname == '\0') + firsttime = 0; + } else { + if (dols && firsttime) { + firsttime = 0; + } else { + isdir = 0; + } + } + + if (get_dentfromdir (mydata, startsect, subname, dentptr, + isdir ? 0 : dols) == NULL) { + if (dols && !isdir) + return 0; + return -1; + } + + if (idx >= 0) { + if (!(dentptr->attr & ATTR_DIR)) + return -1; + subname = nextname; + } + } + ret = get_contents (mydata, dentptr, buffer, maxsize); + FAT_DPRINT ("Size: %d, got: %ld\n", FAT2CPU32 (dentptr->size), ret); + + return ret; +} + + +int +file_fat_detectfs(void) +{ + boot_sector bs; + volume_info volinfo; + int fatsize; + + return read_bootsectandvi(&bs, &volinfo, &fatsize); +} + + +int +file_fat_ls(const char *dir) +{ + return do_fat_read(dir, NULL, 0, LS_YES); +} + + +long +file_fat_read(const char *filename, void *buffer, unsigned long maxsize) +{ + return do_fat_read(filename, buffer, maxsize, LS_NO); +} + +#endif /* #if (CONFIG_COMMANDS & CFG_CMD_FAT) */ |