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FAT: Make it possible to read from any file position

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When storage devices contain files larger than the embedded RAM, it is
useful to be able to read these files by chunks, e.g. for a software
update to the embedded NAND Flash from an external storage device (USB
stick, SD card, etc.).

Hence, this patch makes it possible by adding a new FAT API to read
files from a given position. This patch also adds this feature to the
fatload command.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Wolfgang Denk <wd@denx.de>
Signed-off-by: Tom Rini <trini@ti.com>
This commit is contained in:
Benoît Thébaudeau 2012-09-18 08:14:56 +00:00 committed by Tom Rini
parent 9aa90c1df0
commit 1170e634dd
4 changed files with 105 additions and 38 deletions
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25
common/cmd_fat.c
View file

@ -37,7 +37,8 @@ int do_fat_fsload (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
long size;
unsigned long offset;
unsigned long count;
unsigned long count = 0;
unsigned long pos = 0;
char buf [12];
block_dev_desc_t *dev_desc=NULL;
disk_partition_t info;
@ -45,7 +46,7 @@ int do_fat_fsload (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
if (argc < 5) {
printf("usage: fatload <interface> [<dev[:part]>] "
"<addr> <filename> [bytes]\n");
"<addr> <filename> [bytes [pos]]\n");
return 1;
}
@ -60,11 +61,11 @@ int do_fat_fsload (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
return 1;
}
offset = simple_strtoul(argv[3], NULL, 16);
if (argc == 6)
if (argc >= 6)
count = simple_strtoul(argv[5], NULL, 16);
else
count = 0;
size = file_fat_read(argv[4], (unsigned char *)offset, count);
if (argc >= 7)
pos = simple_strtoul(argv[6], NULL, 16);
size = file_fat_read_at(argv[4], pos, (unsigned char *)offset, count);
if(size==-1) {
printf("\n** Unable to read \"%s\" from %s %d:%d **\n",
@ -82,11 +83,15 @@ int do_fat_fsload (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
U_BOOT_CMD(
fatload, 6, 0, do_fat_fsload,
fatload, 7, 0, do_fat_fsload,
"load binary file from a dos filesystem",
"<interface> [<dev[:part]>] <addr> <filename> [bytes]\n"
" - load binary file 'filename' from 'dev' on 'interface'\n"
" to address 'addr' from dos filesystem"
"<interface> [<dev[:part]>] <addr> <filename> [bytes [pos]]\n"
" - Load binary file 'filename' from 'dev' on 'interface'\n"
" to address 'addr' from dos filesystem.\n"
" 'pos' gives the file position to start loading from.\n"
" If 'pos' is omitted, 0 is used. 'pos' requires 'bytes'.\n"
" 'bytes' gives the size to load. If 'bytes' is 0 or omitted,\n"
" the load stops on end of file."
);
int do_fat_ls (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])

98
fs/fat/fat.c
View file

@ -328,13 +328,16 @@ get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size)
}
/*
* Read at most 'maxsize' bytes from the file associated with 'dentptr'
* Read at most 'maxsize' bytes from 'pos' in the file associated with 'dentptr'
* into 'buffer'.
* Return the number of bytes read or -1 on fatal errors.
*/
__u8 get_contents_vfatname_block[MAX_CLUSTSIZE]
__aligned(ARCH_DMA_MINALIGN);
static long
get_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer,
unsigned long maxsize)
get_contents(fsdata *mydata, dir_entry *dentptr, unsigned long pos,
__u8 *buffer, unsigned long maxsize)
{
unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0;
unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;
@ -344,11 +347,58 @@ get_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer,
debug("Filesize: %ld bytes\n", filesize);
if (maxsize > 0 && filesize > maxsize)
filesize = maxsize;
if (pos >= filesize) {
debug("Read position past EOF: %lu\n", pos);
return gotsize;
}
if (maxsize > 0 && filesize > pos + maxsize)
filesize = pos + maxsize;
debug("%ld bytes\n", filesize);
actsize = bytesperclust;
/* go to cluster at pos */
while (actsize <= pos) {
curclust = get_fatent(mydata, curclust);
if (CHECK_CLUST(curclust, mydata->fatsize)) {
debug("curclust: 0x%x\n", curclust);
debug("Invalid FAT entry\n");
return gotsize;
}
actsize += bytesperclust;
}
/* actsize > pos */
actsize -= bytesperclust;
filesize -= actsize;
pos -= actsize;
/* align to beginning of next cluster if any */
if (pos) {
actsize = min(filesize, bytesperclust);
if (get_cluster(mydata, curclust, get_contents_vfatname_block,
(int)actsize) != 0) {
printf("Error reading cluster\n");
return -1;
}
filesize -= actsize;
actsize -= pos;
memcpy(buffer, get_contents_vfatname_block + pos, actsize);
gotsize += actsize;
if (!filesize)
return gotsize;
buffer += actsize;
curclust = get_fatent(mydata, curclust);
if (CHECK_CLUST(curclust, mydata->fatsize)) {
debug("curclust: 0x%x\n", curclust);
debug("Invalid FAT entry\n");
return gotsize;
}
}
actsize = bytesperclust;
endclust = curclust;
@ -433,9 +483,6 @@ static int slot2str(dir_slot *slotptr, char *l_name, int *idx)
* into 'retdent'
* Return 0 on success, -1 otherwise.
*/
__u8 get_vfatname_block[MAX_CLUSTSIZE]
__aligned(ARCH_DMA_MINALIGN);
static int
get_vfatname(fsdata *mydata, int curclust, __u8 *cluster,
dir_entry *retdent, char *l_name)
@ -474,13 +521,13 @@ get_vfatname(fsdata *mydata, int curclust, __u8 *cluster,
return -1;
}
if (get_cluster(mydata, curclust, get_vfatname_block,
if (get_cluster(mydata, curclust, get_contents_vfatname_block,
mydata->clust_size * mydata->sect_size) != 0) {
debug("Error: reading directory block\n");
return -1;
}
slotptr2 = (dir_slot *)get_vfatname_block;
slotptr2 = (dir_slot *)get_contents_vfatname_block;
while (counter > 0) {
if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK)
& 0xff) != counter)
@ -491,7 +538,7 @@ get_vfatname(fsdata *mydata, int curclust, __u8 *cluster,
/* Save the real directory entry */
realdent = (dir_entry *)slotptr2;
while ((__u8 *)slotptr2 > get_vfatname_block) {
while ((__u8 *)slotptr2 > get_contents_vfatname_block) {
slotptr2--;
slot2str(slotptr2, l_name, &idx);
}
@ -770,11 +817,12 @@ exit:
return ret;
}
__u8 do_fat_read_block[MAX_CLUSTSIZE]
__u8 do_fat_read_at_block[MAX_CLUSTSIZE]
__aligned(ARCH_DMA_MINALIGN);
long
do_fat_read(const char *filename, void *buffer, unsigned long maxsize, int dols)
do_fat_read_at(const char *filename, unsigned long pos, void *buffer,
unsigned long maxsize, int dols)
{
char fnamecopy[2048];
boot_sector bs;
@ -888,12 +936,12 @@ do_fat_read(const char *filename, void *buffer, unsigned long maxsize, int dols)
(mydata->fatsize == 32) ?
(mydata->clust_size) :
PREFETCH_BLOCKS,
do_fat_read_block) < 0) {
do_fat_read_at_block) < 0) {
debug("Error: reading rootdir block\n");
goto exit;
}
dentptr = (dir_entry *) do_fat_read_block;
dentptr = (dir_entry *) do_fat_read_at_block;
}
for (i = 0; i < DIRENTSPERBLOCK; i++) {
@ -913,7 +961,7 @@ do_fat_read(const char *filename, void *buffer, unsigned long maxsize, int dols)
get_vfatname(mydata,
root_cluster,
do_fat_read_block,
do_fat_read_at_block,
dentptr, l_name);
if (dols == LS_ROOT) {
@ -1116,7 +1164,7 @@ rootdir_done:
subname = nextname;
}
ret = get_contents(mydata, dentptr, buffer, maxsize);
ret = get_contents(mydata, dentptr, pos, buffer, maxsize);
debug("Size: %d, got: %ld\n", FAT2CPU32(dentptr->size), ret);
exit:
@ -1124,6 +1172,12 @@ exit:
return ret;
}
long
do_fat_read(const char *filename, void *buffer, unsigned long maxsize, int dols)
{
return do_fat_read_at(filename, 0, buffer, maxsize, dols);
}
int file_fat_detectfs(void)
{
boot_sector bs;
@ -1192,8 +1246,14 @@ 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)
long file_fat_read_at(const char *filename, unsigned long pos, void *buffer,
unsigned long maxsize)
{
printf("reading %s\n", filename);
return do_fat_read(filename, buffer, maxsize, LS_NO);
return do_fat_read_at(filename, pos, buffer, maxsize, LS_NO);
}
long file_fat_read(const char *filename, void *buffer, unsigned long maxsize)
{
return file_fat_read_at(filename, 0, buffer, maxsize);
}

18
fs/fat/fat_write.c
View file

@ -328,7 +328,7 @@ static void flush_dir_table(fsdata *mydata, dir_entry **dentptr);
static void
fill_dir_slot(fsdata *mydata, dir_entry **dentptr, const char *l_name)
{
dir_slot *slotptr = (dir_slot *)get_vfatname_block;
dir_slot *slotptr = (dir_slot *)get_contents_vfatname_block;
__u8 counter = 0, checksum;
int idx = 0, ret;
char s_name[16];
@ -373,7 +373,7 @@ static __u32 dir_curclust;
* a slot) into 'l_name'. If successful also copy the real directory entry
* into 'retdent'
* If additional adjacent cluster for directory entries is read into memory,
* then 'get_vfatname_block' is copied into 'get_dentfromdir_block' and
* then 'get_contents_vfatname_block' is copied into 'get_dentfromdir_block' and
* the location of the real directory entry is returned by 'retdent'
* Return 0 on success, -1 otherwise.
*/
@ -416,13 +416,13 @@ get_long_file_name(fsdata *mydata, int curclust, __u8 *cluster,
dir_curclust = curclust;
if (get_cluster(mydata, curclust, get_vfatname_block,
if (get_cluster(mydata, curclust, get_contents_vfatname_block,
mydata->clust_size * mydata->sect_size) != 0) {
debug("Error: reading directory block\n");
return -1;
}
slotptr2 = (dir_slot *)get_vfatname_block;
slotptr2 = (dir_slot *)get_contents_vfatname_block;
while (counter > 0) {
if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK)
& 0xff) != counter)
@ -433,7 +433,7 @@ get_long_file_name(fsdata *mydata, int curclust, __u8 *cluster,
/* Save the real directory entry */
realdent = (dir_entry *)slotptr2;
while ((__u8 *)slotptr2 > get_vfatname_block) {
while ((__u8 *)slotptr2 > get_contents_vfatname_block) {
slotptr2--;
slot2str(slotptr2, l_name, &idx);
}
@ -459,9 +459,9 @@ get_long_file_name(fsdata *mydata, int curclust, __u8 *cluster,
*retdent = realdent;
if (slotptr2) {
memcpy(get_dentfromdir_block, get_vfatname_block,
memcpy(get_dentfromdir_block, get_contents_vfatname_block,
mydata->clust_size * mydata->sect_size);
cur_position = (__u8 *)realdent - get_vfatname_block;
cur_position = (__u8 *)realdent - get_contents_vfatname_block;
*retdent = (dir_entry *) &get_dentfromdir_block[cur_position];
}
@ -980,11 +980,11 @@ static int do_fat_write(const char *filename, void *buffer,
if (disk_read(cursect,
(mydata->fatsize == 32) ?
(mydata->clust_size) :
PREFETCH_BLOCKS, do_fat_read_block) < 0) {
PREFETCH_BLOCKS, do_fat_read_at_block) < 0) {
debug("Error: reading rootdir block\n");
goto exit;
}
dentptr = (dir_entry *) do_fat_read_block;
dentptr = (dir_entry *) do_fat_read_at_block;
name_len = strlen(filename);
if (name_len >= VFAT_MAXLEN_BYTES)

2
include/fat.h
View file

@ -208,6 +208,8 @@ file_read_func file_fat_read;
int file_cd(const char *path);
int file_fat_detectfs(void);
int file_fat_ls(const char *dir);
long file_fat_read_at(const char *filename, unsigned long pos, void *buffer,
unsigned long maxsize);
long file_fat_read(const char *filename, void *buffer, unsigned long maxsize);
const char *file_getfsname(int idx);
int fat_register_device(block_dev_desc_t *dev_desc, int part_no);