_mfs_error MFS_Find_next_slave
(
MFS_DRIVE_STRUCT_PTR drive_ptr, /*[IN] drive context */
void *search_next_ptr /*[IN] address of search data block indicating the current criteria and the results
** of the last search results of this search are placed in this data block */
)
{
MFS_SEARCH_DATA_PTR transfer_ptr;
MFS_INTERNAL_SEARCH_PTR internal_search_ptr;
MFS_DIR_ENTRY_PTR dir_entry_ptr;
_mfs_error error_code;
uint32_t len;
bool found;
bool match_all;
bool eightdotthree = FALSE;
char *lfn;
char sname[SFILENAME_SIZE+1];
uint32_t dotfile = 0;
MFS_DIR_ENTRY saved_dir_entry;
transfer_ptr = (MFS_SEARCH_DATA_PTR) search_next_ptr;
error_code = MFS_NO_ERROR;
found = FALSE;
if ( transfer_ptr )
{
internal_search_ptr = &transfer_ptr->INTERNAL_SEARCH_DATA;
if ( MFS_alloc_path(&lfn)!= MFS_NO_ERROR )
{
return MFS_INSUFFICIENT_MEMORY;
}
match_all = MFS_Check_search_string_for_all(internal_search_ptr->SRC_PTR);
if ( !match_all )
{
dotfile = MFS_Is_dot_directory(internal_search_ptr->SRC_PTR);
if ( dotfile == 0 )
{
eightdotthree = MFS_Check_search_string_for_8dot3( internal_search_ptr->SRC_PTR);
}
}
do
{
dir_entry_ptr = MFS_Find_directory_entry(drive_ptr, NULL, &internal_search_ptr->CURRENT_CLUSTER, &internal_search_ptr->DIR_ENTRY_INDEX,
&internal_search_ptr->PREV_CLUSTER, internal_search_ptr->ATTRIBUTE & (~ATTR_EXCLUSIVE), &error_code);
if ( dir_entry_ptr == NULL && !error_code )
{
error_code = MFS_FILE_NOT_FOUND;
break;
}
if ( internal_search_ptr->CURRENT_CLUSTER == CLUSTER_INVALID )
{
error_code = MFS_FILE_NOT_FOUND;
break;
}
if ( dir_entry_ptr == NULL )
{
break;
}
saved_dir_entry=*dir_entry_ptr;
/* Make sure the entry is not an LFN entry */
if ( *dir_entry_ptr->ATTRIBUTE != MFS_ATTR_LFN )
{
MFS_Compress_nondotfile (dir_entry_ptr->NAME, sname);
if ( match_all )
{
found = TRUE;
}
else
{
if ( dotfile != 0 )
{
if ( dotfile == 1 )
{
found = internal_search_ptr->FULLNAME[0] == dir_entry_ptr->NAME[0];
}
else if ( dotfile == 2 )
{
found = (internal_search_ptr->FULLNAME[0] == dir_entry_ptr->NAME[0]) &&
(internal_search_ptr->FULLNAME[1] == dir_entry_ptr->NAME[1]);
}
else
{
found = FALSE; /* This shouldn't happen */
}
}
else if ( eightdotthree )
{
found = MFS_Wildcard_match(internal_search_ptr->FILENAME, dir_entry_ptr->NAME);
}
else
{
if ( MFS_get_lfn_dir_cluster(drive_ptr, search_next_ptr, sname, lfn) == MFS_NO_ERROR )
{
found = MFS_lfn_match(internal_search_ptr->SRC_PTR, lfn, 0);
}
else
{
found = MFS_lfn_match(internal_search_ptr->SRC_PTR, sname, 0);
}
}
}
}
if ( !error_code )
{
error_code = MFS_Increment_dir_index(drive_ptr, &internal_search_ptr->CURRENT_CLUSTER,
&internal_search_ptr->DIR_ENTRY_INDEX, &internal_search_ptr->PREV_CLUSTER);
}
} while ( (error_code == MFS_NO_ERROR) && (found == FALSE) );
if ( error_code == MFS_NO_ERROR )
{
transfer_ptr->ATTRIBUTE = mqx_dtohc(saved_dir_entry.ATTRIBUTE);
transfer_ptr->TIME = mqx_dtohs(saved_dir_entry.TIME);
transfer_ptr->DATE = mqx_dtohs(saved_dir_entry.DATE);
transfer_ptr->FILE_SIZE = mqx_dtohl(saved_dir_entry.FILE_SIZE);
/* Transfer the filename */
len = _strnlen(sname,13);
if ( sname[len-1] == '.' )
{
sname[len-1] = '\0';
}
strncpy(transfer_ptr->NAME, sname, 13);
}
MFS_free_path((void *)lfn);
}
else
{
error_code = MFS_INVALID_MEMORY_BLOCK_ADDRESS;
}
return(error_code);
}
/*!
* \brief Used to set the MFS drive parameters for a unit.
*
* This function assumes that the boot sector of the drive is stored in
* the drive's sector buffer. This function is called after MFS is
* initialized, or after the drive has been formatted.
*
* NOTE: It is assumed that the drive is locked by the calling function.
*
* \param drive_ptr
*
* \return uint32_t Error code.
*/
uint32_t MFS_Mount_drive_internal(
MFS_DRIVE_STRUCT_PTR drive_ptr)
{
BIOS_PARAM_STRUCT_DISK_PTR bpb_ptr;
BIOS_PARAM32_STRUCT_DISK_PTR bpb32_ptr;
FILESYSTEM_INFO_DISK_PTR fsinfo_ptr;
uint32_t reserved_sectors;
uint32_t root_dir_sectors;
uint32_t data_sectors;
uint32_t cluster_count;
uint32_t bpb_sector_size;
uint32_t bpb_sector_mult;
int error_code;
int result = MFS_NO_ERROR;
uint8_t *boot_sector;
drive_ptr->DOS_DISK = false;
error_code = MFS_sector_cache_invalidate(drive_ptr, 0, 0);
if (error_code != MFS_NO_ERROR)
{
return error_code;
}
error_code = MFS_sector_map(drive_ptr, BOOT_SECTOR, (void **)&boot_sector, MFS_MAP_MODE_READONLY, 0);
if (error_code != MFS_NO_ERROR)
{
return error_code;
}
/*
** Extract the drive parameters (BIOS Parameter Block) from the BOOT Record.
*/
bpb_ptr = (BIOS_PARAM_STRUCT_DISK_PTR)boot_sector;
bpb32_ptr = (BIOS_PARAM32_STRUCT_DISK_PTR)(boot_sector + sizeof(BIOS_PARAM_STRUCT_DISK));
/*
** Next, check to see that the BOOT record is that of a DOS disk. If not,
** the drive will have to be formatted by the upper layer before the drive
** can be 'mounted'.
*/
if ((boot_sector[0] != MFS_DOS30_JMP) && (boot_sector[0] != MFS_DOS30_B))
{
result = MFS_NOT_A_DOS_DISK;
}
if (result == MFS_NO_ERROR)
{
/*
** Always use storage device sector size.
** If BPB sector size is larger, then recalculate other parameters accordingly.
** In any case, BPB sector size has to be multiple of device sector size, the code explicitly checks this.
*/
bpb_sector_size = mqx_dtohs(bpb_ptr->SECTOR_SIZE);
if (bpb_sector_size % drive_ptr->SECTOR_SIZE)
{
result = MFS_NOT_A_DOS_DISK;
}
}
if (result == MFS_NO_ERROR)
{
/* Sector values from BPB are to be multiplied by this factor */
bpb_sector_mult = bpb_sector_size / drive_ptr->SECTOR_SIZE;
reserved_sectors = mqx_dtohs(bpb_ptr->RESERVED_SECTORS) * bpb_sector_mult;
drive_ptr->SECTORS_PER_CLUSTER = mqx_dtohc(bpb_ptr->SECTORS_PER_CLUSTER) * bpb_sector_mult;
drive_ptr->CLUSTER_POWER_SECTORS = ilog2(drive_ptr->SECTORS_PER_CLUSTER);
drive_ptr->CLUSTER_POWER_BYTES = drive_ptr->SECTOR_POWER + drive_ptr->CLUSTER_POWER_SECTORS;
drive_ptr->CLUSTER_SIZE_BYTES = drive_ptr->SECTOR_SIZE * drive_ptr->SECTORS_PER_CLUSTER;
drive_ptr->NUMBER_OF_FAT = mqx_dtohc(bpb_ptr->NUMBER_OF_FAT);
drive_ptr->ROOT_ENTRIES = mqx_dtohs(bpb_ptr->ROOT_ENTRIES);
drive_ptr->SECTORS_PER_FAT = mqx_dtohs(bpb_ptr->SECTORS_PER_FAT);
if (drive_ptr->SECTORS_PER_FAT == 0)
{
drive_ptr->SECTORS_PER_FAT = mqx_dtohl(bpb32_ptr->FAT_SIZE);
}
drive_ptr->SECTORS_PER_FAT *= bpb_sector_mult;
drive_ptr->MEGA_SECTORS = mqx_dtohs(bpb_ptr->NUMBER_SECTORS);
if (drive_ptr->MEGA_SECTORS == 0)
{
drive_ptr->MEGA_SECTORS = mqx_dtohl(bpb_ptr->MEGA_SECTORS);
}
drive_ptr->MEGA_SECTORS *= bpb_sector_mult;
/* Determine FAT type by calculating the count of clusters on disk */
drive_ptr->ENTRIES_PER_SECTOR = drive_ptr->SECTOR_SIZE / sizeof(DIR_ENTRY_DISK);
root_dir_sectors = drive_ptr->ROOT_ENTRIES / drive_ptr->ENTRIES_PER_SECTOR;
data_sectors = drive_ptr->MEGA_SECTORS - reserved_sectors - root_dir_sectors - (drive_ptr->NUMBER_OF_FAT * drive_ptr->SECTORS_PER_FAT);
cluster_count = data_sectors / drive_ptr->SECTORS_PER_CLUSTER;
/* Now we have cluster count, so we can determine FAT type */
if (cluster_count < 4085)
{
drive_ptr->FAT_TYPE = MFS_FAT12;
}
else if (cluster_count < 65525)
{
drive_ptr->FAT_TYPE = MFS_FAT16;
}
else
{
drive_ptr->FAT_TYPE = MFS_FAT32;
}
drive_ptr->CLUSTER_SIZE_BYTES = drive_ptr->SECTOR_SIZE * drive_ptr->SECTORS_PER_CLUSTER;
drive_ptr->CLUSTER_POWER_BYTES = drive_ptr->SECTOR_POWER + drive_ptr->CLUSTER_POWER_SECTORS;
drive_ptr->FREE_COUNT = FSI_UNKNOWN; /* This is the unknown value */
drive_ptr->NEXT_FREE_CLUSTER = FSI_UNKNOWN; /* MFS will calculate it later */
drive_ptr->FAT_START_SECTOR = reserved_sectors;
drive_ptr->DATA_START_SECTOR = drive_ptr->FAT_START_SECTOR + (drive_ptr->SECTORS_PER_FAT * drive_ptr->NUMBER_OF_FAT) + root_dir_sectors;
if (drive_ptr->FAT_TYPE != MFS_FAT32)
{
/* FAT12 or FAT16 */
drive_ptr->ROOT_START_SECTOR = drive_ptr->FAT_START_SECTOR + (drive_ptr->SECTORS_PER_FAT * drive_ptr->NUMBER_OF_FAT);
drive_ptr->ROOT_CLUSTER = 0;
MFS_chain_forge(drive_ptr, &drive_ptr->ROOT_CHAIN, drive_ptr->ROOT_START_SECTOR, root_dir_sectors);
}
else if (mqx_dtohs(bpb32_ptr->FS_VER) > MFS_FAT32_VER)
{
/* Unsupported FAT32 level */
result = MFS_ERROR_UNKNOWN_FS_VERSION;
}
else
{
/* Supported FAT32 */
drive_ptr->ROOT_CLUSTER = mqx_dtohl(bpb32_ptr->ROOT_CLUSTER);
drive_ptr->ROOT_START_SECTOR = 0;
MFS_chain_init(drive_ptr, &drive_ptr->ROOT_CHAIN, drive_ptr->ROOT_CLUSTER);
drive_ptr->FS_INFO = mqx_dtohs(bpb32_ptr->FS_INFO);
}
}
error_code = MFS_sector_unmap(drive_ptr, BOOT_SECTOR, 0);
if (result == MFS_NO_ERROR)
{
result = error_code;
}
if (result != MFS_NO_ERROR)
{
return result;
}
if (drive_ptr->FAT_TYPE == MFS_FAT32)
{
/*
** Reset the FSInfo->Free_Count and the FSInfo->Next_Free to
** unknown (0xFFFFFFFF). MFS uses it's own internal version of these
** fields. If Windows uses the same disk, it will recalculate the
** correct fields the first time it mounts the drive.
*/
error_code = MFS_sector_map(drive_ptr, drive_ptr->FS_INFO, (void **)&fsinfo_ptr, MFS_is_read_only(drive_ptr) ? MFS_MAP_MODE_READONLY : MFS_MAP_MODE_MODIFY, 0);
if (error_code == MFS_NO_ERROR)
{
if ((mqx_dtohl(fsinfo_ptr->LEAD_SIG) == FSI_LEADSIG) && (mqx_dtohl(fsinfo_ptr->STRUCT_SIG) == FSI_STRUCTSIG) &&
(mqx_dtohl(fsinfo_ptr->TRAIL_SIG) == FSI_TRAILSIG))
{
drive_ptr->FREE_COUNT = mqx_dtohl(fsinfo_ptr->FREE_COUNT);
drive_ptr->NEXT_FREE_CLUSTER = mqx_dtohl(fsinfo_ptr->NEXT_FREE);
}
if (!MFS_is_read_only(drive_ptr))
{
mqx_htodl(fsinfo_ptr->LEAD_SIG, FSI_LEADSIG);
mqx_htodl(fsinfo_ptr->STRUCT_SIG, FSI_STRUCTSIG);
mqx_htodl(fsinfo_ptr->FREE_COUNT, FSI_UNKNOWN); /* compute it */
mqx_htodl(fsinfo_ptr->NEXT_FREE, FSI_UNKNOWN); /* compute it */
mqx_htodl(fsinfo_ptr->TRAIL_SIG, FSI_TRAILSIG);
}
error_code = MFS_sector_unmap(drive_ptr, drive_ptr->FS_INFO, !MFS_is_read_only(drive_ptr));
}
if (result == MFS_NO_ERROR)
{
result = error_code;
}
}
drive_ptr->LAST_CLUSTER = (drive_ptr->MEGA_SECTORS - drive_ptr->DATA_START_SECTOR) / drive_ptr->SECTORS_PER_CLUSTER + 1;
drive_ptr->CURRENT_DIR[0] = '\\'; /* Root dir */
drive_ptr->CURRENT_DIR[1] = '\0';
drive_ptr->CUR_DIR_CLUSTER = drive_ptr->ROOT_CLUSTER;
drive_ptr->CUR_DIR_CHAIN_PTR = &drive_ptr->ROOT_CHAIN;
if (result == MFS_NO_ERROR)
{
drive_ptr->DOS_DISK = true;
}
return result;
}
