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uboot-mt623x/fs/fat/fat.c

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/*
* 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 = '<EFBFBD>';
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 = '<EFBFBD>';
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) */
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