diff options
Diffstat (limited to 'x-loader/fs/fat/fat.c')
| -rw-r--r-- | x-loader/fs/fat/fat.c | 32 |
1 files changed, 20 insertions, 12 deletions
diff --git a/x-loader/fs/fat/fat.c b/x-loader/fs/fat/fat.c index 0e91556..44ecb4a 100644 --- a/x-loader/fs/fat/fat.c +++ b/x-loader/fs/fat/fat.c @@ -145,13 +145,11 @@ fat_register_device(block_dev_desc_t *dev_desc, int part_no) 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=63; - //part_offset=0; + part_offset = buffer[DOS_PART_TBL_OFFSET+8] | + buffer[DOS_PART_TBL_OFFSET+9] <<8 | + buffer[DOS_PART_TBL_OFFSET+10]<<16 | + buffer[DOS_PART_TBL_OFFSET+11]<<24; + cur_part = 1; #endif } @@ -386,7 +384,7 @@ get_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer, newclust = get_fatent(mydata, endclust); if((newclust -1)!=endclust) goto getit; - if (newclust <= 0x0001 || newclust >= 0xfff0) { + if (newclust <= 0x0001 || newclust >= 0xfffff0) { FAT_DPRINT("curclust: 0x%x\n", newclust); FAT_DPRINT("Invalid FAT entry\n"); return gotsize; @@ -421,7 +419,7 @@ getit: filesize -= actsize; buffer += actsize; curclust = get_fatent(mydata, endclust); - if (curclust <= 0x0001 || curclust >= 0xfff0) { + if (curclust <= 0x0001 || curclust >= 0xfffff0) { FAT_DPRINT("curclust: 0x%x\n", curclust); FAT_ERROR("Invalid FAT entry\n"); return gotsize; @@ -582,7 +580,7 @@ static dir_entry *get_dentfromdir (fsdata * mydata, int startsect, return retdent; } curclust = get_fatent (mydata, curclust); - if (curclust <= 0x0001 || curclust >= 0xfff0) { + if (curclust <= 0x0001 || curclust >= 0xfffff0) { FAT_DPRINT ("curclust: 0x%x\n", curclust); FAT_ERROR ("Invalid FAT entry\n"); return NULL; @@ -681,7 +679,7 @@ do_fat_read(const char *filename, void *buffer, unsigned long maxsize, dir_entry *dentptr; __u16 prevcksum = 0xffff; char *subname = ""; - int rootdir_size, cursect; + int rootdir_size, cursect, curclus; int idx, isdir = 0; int files = 0, dirs = 0; long ret = 0; @@ -699,6 +697,7 @@ do_fat_read(const char *filename, void *buffer, unsigned long maxsize, mydata->fat_sect = bs.reserved; cursect = mydata->rootdir_sect = mydata->fat_sect + mydata->fatlength * bs.fats; + curclus = bs.root_cluster; // For FAT32 only mydata->clust_size = bs.cluster_size; if (mydata->fatsize == 32) { rootdir_size = mydata->clust_size; @@ -820,7 +819,16 @@ do_fat_read(const char *filename, void *buffer, unsigned long maxsize, goto rootdir_done; /* We got a match */ } - cursect++; + + if (mydata->fatsize != 32) + cursect++; + else { + // FAT32 does not guarantee contiguous root directory + curclus = get_fatent (mydata, curclus); + cursect = (curclus * mydata->clust_size) + mydata->data_begin; + + FAT_DPRINT ("root clus %d sector %d\n", curclus, cursect); + } } rootdir_done: |