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Diffstat (limited to 'fs/fat/fat.c')
-rw-r--r--fs/fat/fat.c184
1 files changed, 143 insertions, 41 deletions
diff --git a/fs/fat/fat.c b/fs/fat/fat.c
index 9f0156719..6a6c5be01 100644
--- a/fs/fat/fat.c
+++ b/fs/fat/fat.c
@@ -29,6 +29,7 @@
#include <config.h>
#include <fat.h>
#include <asm/byteorder.h>
+#include <part.h>
#if (CONFIG_COMMANDS & CFG_CMD_FAT)
@@ -44,26 +45,70 @@ downcase(char *str)
}
}
-int (*dev_block_read)(int device, __u32 blknr, __u32 blkcnt, __u8 *buffer) = 0;
+static block_dev_desc_t *cur_dev = NULL;
+static unsigned long part_offset = 0;
+static int cur_part = 1;
+
+#define DOS_PART_TBL_OFFSET 0x1be
+#define DOS_PART_MAGIC_OFFSET 0x1fe
+#define DOS_FS_TYPE_OFFSET 0x36
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);
+ startblock += part_offset;
+ if (cur_dev == NULL)
+ return -1;
+ if (cur_dev->block_read) {
+ return cur_dev->block_read (cur_dev->dev, startblock, getsize, (unsigned long *)bufptr);
}
return -1;
}
int
-fat_register_read (int (*block_read)(int, __u32, __u32, __u8 *))
+fat_register_device(block_dev_desc_t *dev_desc, int part_no)
{
- dev_block_read = block_read;
+ unsigned char buffer[SECTOR_SIZE];
+
+ if (!dev_desc->block_read)
+ return -1;
+ cur_dev=dev_desc;
+ /* check if we have a MBR (on floppies we have only a PBR) */
+ if (dev_desc->block_read (dev_desc->dev, 0, 1, (ulong *) buffer) != 1) {
+ printf ("** Can't read from device %d **\n", dev_desc->dev);
+ return -1;
+ }
+ if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
+ buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
+ /* no signature found */
+ return -1;
+ }
+ if(!strncmp(&buffer[DOS_FS_TYPE_OFFSET],"FAT",3)) {
+ /* ok, we assume we are on a PBR only */
+ cur_part = 1;
+ part_offset=0;
+ }
+ else {
+#if (CONFIG_COMMANDS & CFG_CMD_IDE) || (CONFIG_COMMANDS & CFG_CMD_SCSI)
+ disk_partition_t info;
+ if(!get_partition_info(dev_desc, part_no, &info)) {
+ part_offset = info.start;
+ cur_part = part_no;
+ }
+ else {
+ printf ("** Partition %d not valid on device %d **\n",part_no,dev_desc->dev);
+ return -1;
+ }
+#else
+ /* FIXME we need to determine the start block of the
+ * partition where the DOS FS resides. This can be done
+ * by using the get_partition_info routine. For this
+ * purpose the libpart must be included.
+ */
+ part_offset=32;
+ cur_part = 1;
+#endif
+ }
return 0;
}
@@ -246,25 +291,21 @@ get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size)
}
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;
+ if (disk_read(startsect, size/FS_BLOCK_SIZE , buffer) < 0) {
+ FAT_DPRINT("Error reading data\n");
+ return -1;
+ }
+ if(size % FS_BLOCK_SIZE) {
+ __u8 tmpbuf[FS_BLOCK_SIZE];
+ idx= size/FS_BLOCK_SIZE;
+ if (disk_read(startsect + idx, 1, tmpbuf) < 0) {
+ FAT_DPRINT("Error reading data\n");
+ return -1;
}
- buffer += FS_BLOCK_SIZE;
- size -= FS_BLOCK_SIZE;
- idx++;
+ buffer += idx*FS_BLOCK_SIZE;
+
+ memcpy(buffer, tmpbuf, size % FS_BLOCK_SIZE);
+ return 0;
}
return 0;
@@ -283,6 +324,8 @@ get_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer,
unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0;
unsigned int bytesperclust = mydata->clust_size * SECTOR_SIZE;
__u32 curclust = START(dentptr);
+ __u32 endclust, newclust;
+ unsigned long actsize;
FAT_DPRINT("Filesize: %ld bytes\n", filesize);
@@ -290,25 +333,56 @@ get_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer,
FAT_DPRINT("Reading: %ld bytes\n", filesize);
+ actsize=bytesperclust;
+ endclust=curclust;
do {
- int getsize = (filesize > bytesperclust) ? bytesperclust :
- filesize;
-
- if (get_cluster(mydata, curclust, buffer, getsize) != 0) {
+ /* search for consecutive clusters */
+ while(actsize < filesize) {
+ newclust = get_fatent(mydata, endclust);
+ if((newclust -1)!=endclust)
+ goto getit;
+ if (newclust <= 0x0001 || newclust >= 0xfff0) {
+ FAT_DPRINT("curclust: 0x%x\n", newclust);
+ FAT_DPRINT("Invalid FAT entry\n");
+ return gotsize;
+ }
+ endclust=newclust;
+ actsize+= bytesperclust;
+ }
+ /* actsize >= file size */
+ actsize -= bytesperclust;
+ /* get remaining clusters */
+ if (get_cluster(mydata, curclust, buffer, (int)actsize) != 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);
+ /* get remaining bytes */
+ gotsize += (int)actsize;
+ filesize -= actsize;
+ buffer += actsize;
+ actsize= filesize;
+ if (get_cluster(mydata, endclust, buffer, (int)actsize) != 0) {
+ FAT_ERROR("Error reading cluster\n");
+ return -1;
+ }
+ gotsize+=actsize;
+ return gotsize;
+getit:
+ if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
+ FAT_ERROR("Error reading cluster\n");
+ return -1;
+ }
+ gotsize += (int)actsize;
+ filesize -= actsize;
+ buffer += actsize;
+ curclust = get_fatent(mydata, endclust);
if (curclust <= 0x0001 || curclust >= 0xfff0) {
FAT_DPRINT("curclust: 0x%x\n", curclust);
FAT_ERROR("Invalid FAT entry\n");
return gotsize;
}
+ actsize=bytesperclust;
+ endclust=curclust;
} while (1);
}
@@ -641,7 +715,7 @@ static long
do_fat_read (const char *filename, void *buffer, unsigned long maxsize,
int dols)
{
- __u8 block[FS_BLOCK_SIZE]; /* Block buffer */
+ __u8 block[MAX_CLUSTSIZE]; /* Block buffer */
char fnamecopy[2048];
boot_sector bs;
volume_info volinfo;
@@ -713,7 +787,7 @@ do_fat_read (const char *filename, void *buffer, unsigned long maxsize,
while (1) {
int i;
- if (disk_read (cursect, 1, block) < 0) {
+ if (disk_read (cursect, mydata->clust_size, block) < 0) {
FAT_DPRINT ("Error: reading rootdir block\n");
return -1;
}
@@ -880,8 +954,35 @@ file_fat_detectfs(void)
boot_sector bs;
volume_info volinfo;
int fatsize;
+ char vol_label[12];
- return read_bootsectandvi(&bs, &volinfo, &fatsize);
+ if(cur_dev==NULL) {
+ printf("No current device\n");
+ return 1;
+ }
+#if (CONFIG_COMMANDS & CFG_CMD_IDE) || (CONFIG_COMMANDS & CFG_CMD_SCSI)
+ printf("Interface: ");
+ switch(cur_dev->if_type) {
+ case IF_TYPE_IDE : printf("IDE"); break;
+ case IF_TYPE_SCSI : printf("SCSI"); break;
+ case IF_TYPE_ATAPI : printf("ATAPI"); break;
+ case IF_TYPE_USB : printf("USB"); break;
+ case IF_TYPE_DOC : printf("DOC"); break;
+ case IF_TYPE_MMC : printf("MMC"); break;
+ default : printf("Unknown");
+ }
+ printf("\n Device %d: ",cur_dev->dev);
+ dev_print(cur_dev);
+#endif
+ if(read_bootsectandvi(&bs, &volinfo, &fatsize)) {
+ printf("\nNo valid FAT fs found\n");
+ return 1;
+ }
+ memcpy (vol_label, volinfo.volume_label, 11);
+ vol_label[11] = '\0';
+ volinfo.fs_type[5]='\0';
+ printf("Partition %d: Filesystem: %s \"%s\"\n",cur_part,volinfo.fs_type,vol_label);
+ return 0;
}
@@ -895,6 +996,7 @@ file_fat_ls(const char *dir)
long
file_fat_read(const char *filename, void *buffer, unsigned long maxsize)
{
+ printf("reading %s\n",filename);
return do_fat_read(filename, buffer, maxsize, LS_NO);
}
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-10-31 06:14:38 +0000