_mfs_error MFS_Create_subdir
(
MFS_DRIVE_STRUCT_PTR drive_ptr,
char *pathname /*[IN] pathname of the directory to be created */
)
{
MFS_DIR_ENTRY_PTR dir_entry_ptr;
uint32_t dir_cluster;
uint32_t parent_cluster;
uint32_t free_cluster;
uint32_t dir_index;
_mfs_error error_code;
char *temp_dirname;
char *temp_filename;
if ( (pathname == NULL) || (*pathname == '\0') )
{
return MFS_INVALID_PARAMETER;
}
#if MFSCFG_READ_ONLY_CHECK
if (MFS_is_read_only (drive_ptr))
{
return MFS_DISK_IS_WRITE_PROTECTED;
}
#endif
error_code = MFS_alloc_2paths(&temp_dirname,&temp_filename);
if ( error_code != MFS_NO_ERROR )
{
return( error_code );
}
error_code = MFS_lock_dos_disk( drive_ptr );
if ( error_code != MFS_NO_ERROR )
{
MFS_free_path(temp_dirname);
MFS_free_path(temp_filename);
return error_code;
}
MFS_Parse_pathname (temp_dirname, temp_filename, pathname);
dir_cluster = drive_ptr->CUR_DIR_CLUSTER;
parent_cluster = MFS_Find_directory (drive_ptr, temp_dirname, dir_cluster);
dir_cluster = parent_cluster;
if ( MFS_is_valid_lfn(temp_filename) )
{
if ( dir_cluster != CLUSTER_INVALID )
{
/*
** We'll obtain a cluster for the new directory first. If we
** cannot create the directory afterwards, it is easier to re-free
** the cluster than to remove the new entry.
*/
free_cluster = MFS_Find_unused_cluster_from(drive_ptr, drive_ptr->NEXT_FREE_CLUSTER);
if ( free_cluster != CLUSTER_INVALID )
{
error_code = MFS_Clear_cluster(drive_ptr, free_cluster);
if ( error_code )
{
MFS_unlock(drive_ptr,TRUE);
MFS_free_path(temp_dirname);
MFS_free_path(temp_filename);
return( error_code );
}
error_code = MFS_Put_fat(drive_ptr, free_cluster, CLUSTER_EOF);
dir_entry_ptr = MFS_Create_directory_entry(drive_ptr, temp_filename, MFS_ATTR_DIR_NAME, &dir_cluster, &dir_index, &error_code);
if ( error_code == MFS_NO_ERROR )
{
clustod(dir_entry_ptr->HFIRST_CLUSTER, dir_entry_ptr->LFIRST_CLUSTER, free_cluster);
drive_ptr->DIR_SECTOR_DIRTY = TRUE;
/*
** We shall now create the "." and ".." entries.
*/
dir_cluster = free_cluster;
dir_entry_ptr = MFS_Create_directory_entry(drive_ptr,".", MFS_ATTR_DIR_NAME, &dir_cluster, &dir_index, &error_code);
if ( error_code == MFS_NO_ERROR )
{
clustod(dir_entry_ptr->HFIRST_CLUSTER, dir_entry_ptr->LFIRST_CLUSTER, free_cluster);
drive_ptr->DIR_SECTOR_DIRTY = TRUE;
dir_entry_ptr = MFS_Create_directory_entry(drive_ptr,"..", MFS_ATTR_DIR_NAME, &dir_cluster, &dir_index, &error_code);
if ( error_code == MFS_NO_ERROR )
{
if ( drive_ptr->FAT_TYPE == MFS_FAT32 )
{
if ( drive_ptr->BPB32.ROOT_CLUSTER == parent_cluster )
{
/*
** Even though the FAT32 root sector can be
** anywhere, it is identified as 0 when referenced
** through a directory entry
*/
parent_cluster = 0;
}
}
clustod(dir_entry_ptr->HFIRST_CLUSTER, dir_entry_ptr->LFIRST_CLUSTER, parent_cluster);
drive_ptr->DIR_SECTOR_DIRTY = TRUE;
}
}
}
else
{
MFS_Put_fat(drive_ptr, free_cluster, CLUSTER_UNUSED);
}
}
else
{
error_code = MFS_DISK_FULL;
}
}
else
{
error_code = MFS_PATH_NOT_FOUND;
}
}
else if ( MFS_lfn_dirname_valid(temp_filename) )
{
if ( dir_cluster )
{
error_code = MFS_FILE_EXISTS;
}
else
{
error_code = MFS_CANNOT_CREATE_DIRECTORY;
}
}
else
{
error_code = MFS_INVALID_PARAMETER;
}
MFS_free_path(temp_dirname);
MFS_free_path(temp_filename);
MFS_unlock(drive_ptr,TRUE);
return(error_code);
}
MFS_DIR_ENTRY_PTR MFS_Create_directory_entry
(
MFS_DRIVE_STRUCT_PTR drive_ptr, /*[IN] the drive on which to operate */
char_ptr filename_ptr, /*[IN] pointer to the file's name */
char attribute, /*[IN] attribute to be assigned to the file */
uint_32_ptr dir_cluster_ptr, /*[IN/OUT] indicates cluster in which the entry was put.*/
uint_32_ptr dir_index_ptr, /*[IN/OUT] index of the location of new file within the directory */
uint_32_ptr error_ptr /*[IN/OUT] error_return_address */
)
{
MFS_DIR_ENTRY_PTR dir_entry_ptr, dir_entry_ptr1;
MFS_DIR_ENTRY_PTR temp_entry_ptr;
TIME_STRUCT time;
DATE_STRUCT clk_time;
uint_32 dir_index, saved_index, temp_index;
uint_32 entry_cluster, saved_cluster, temp_cluster;
uint_32 needed_entries, i;
int_32 length;
boolean found_all = FALSE;
char temp_name[SFILENAME_SIZE+1], short_name[SFILENAME_SIZE+1];
uchar checksum = 0;
uint_32 prev_cluster= CLUSTER_INVALID, saved_prev_cluster, temp_prev_cluster;
dir_entry_ptr = NULL;
entry_cluster = *dir_cluster_ptr;
dir_index = 0;
/*
** Check for duplicate file
*/
if ( filename_ptr == NULL )
{
*error_ptr = MFS_INVALID_PARAMETER;
}
else if ( *filename_ptr == '\0' )
{
*error_ptr = MFS_FILE_NOT_FOUND;
}
#if MFSCFG_READ_ONLY_CHECK
else if (MFS_is_read_only (NULL, drive_ptr))
{
*error_ptr = MFS_DISK_IS_WRITE_PROTECTED;
}
#endif
else if ( (dir_entry_ptr = MFS_Find_directory_entry(drive_ptr, filename_ptr,
&entry_cluster, &dir_index, &prev_cluster, MFS_ATTR_ANY, error_ptr)) != NULL )
{
*error_ptr = MFS_FILE_EXISTS;
}
else
{
/*
** Search for an empty slot
*/
dir_index = 0;
dir_entry_ptr = MFS_Find_directory_entry(drive_ptr, "", &entry_cluster, &dir_index, &prev_cluster, attribute, error_ptr);
if ( MFS_Dirname_valid(filename_ptr) )
{
found_all = TRUE;
}
if ( dir_entry_ptr == NULL && !*error_ptr )
{
found_all = TRUE;
}
/*
** Save it now because we might not go into the while loop
** If we don't go into while, we lose original values when these
** variables are restored after the while loop
*/
saved_cluster = entry_cluster;
saved_index = dir_index;
while ( !found_all )
{
/* Calculate the amount of extra entries needed for LFN's */
saved_cluster = entry_cluster;
saved_index = dir_index;
for ( needed_entries = (strlen(filename_ptr) + 12) / 13; needed_entries >= 1 && !found_all; needed_entries-- )
{
*error_ptr = MFS_Increment_dir_index(drive_ptr, &entry_cluster, &dir_index, NULL);
if ( entry_cluster == CLUSTER_EOF && !*error_ptr )
{
/* This means the LFN will span a cluster. */
found_all = TRUE;
break;
}
temp_index = dir_index;
temp_cluster = entry_cluster;
temp_entry_ptr = MFS_Find_directory_entry(drive_ptr, "", &entry_cluster, &dir_index, &prev_cluster, MFS_ATTR_ANY,error_ptr);
if ( *error_ptr )
{
return NULL;
}
if ( !temp_entry_ptr )
{
found_all = TRUE;
dir_entry_ptr = NULL;
break;
}
else if ( dir_index == temp_index && temp_cluster == entry_cluster )
{
continue;
}
else
{
break;
}
}
if ( needed_entries == 0 )
{
found_all = TRUE;
}
if ( found_all )
{
dir_entry_ptr = MFS_Find_directory_entry(drive_ptr, "", &saved_cluster, &saved_index, &saved_prev_cluster, MFS_ATTR_ANY,error_ptr);
}
}
entry_cluster = saved_cluster;
dir_index = saved_index;
if ( dir_entry_ptr == NULL && !*error_ptr )
{
/*
** Empty spot not found... get a new cluster and use the first entry.
*/
dir_index = 0;
if ( entry_cluster == 0 )
{
*error_ptr = MFS_ROOT_DIR_FULL;
return(NULL);
}
else
{
*error_ptr = MFS_Add_cluster_to_chain(drive_ptr, entry_cluster, &entry_cluster);
if ( *error_ptr == MFS_NO_ERROR )
{
*error_ptr = MFS_Clear_cluster(drive_ptr, entry_cluster);
if ( *error_ptr )
{
return(NULL);
}
dir_entry_ptr = (pointer) drive_ptr->DIR_SECTOR_PTR;
*error_ptr = MFS_Write_back_fat(drive_ptr);
if ( *error_ptr )
{
return(NULL);
}
}
}
}
}
if ( *error_ptr == MFS_NO_ERROR )
{
/* At this point we have one of the following cases
**
** 1. We have a normal 8.3 filename and an empty slot for it
** 2. We have a LFN, and a slot which has enough consecutive free slots
** to store the LFN, followed by the actual entry
*/
/* If the file is a normal 8.3 file */
if ( MFS_Dirname_valid(filename_ptr) )
{
_mem_zero(dir_entry_ptr, sizeof (MFS_DIR_ENTRY));
htodc(dir_entry_ptr->ATTRIBUTE, attribute);
MFS_Expand_dotfile(filename_ptr, dir_entry_ptr->NAME);
_time_get(&time);
_time_to_date(&time, &clk_time);
NORMALIZE_DATE(&clk_time);
htods(dir_entry_ptr->TIME, PACK_TIME(clk_time));
htods(dir_entry_ptr->DATE, PACK_DATE(clk_time));
drive_ptr->DIR_SECTOR_DIRTY = TRUE;
}
else
{
/* Case where the file is a LFN */
length = strlen(filename_ptr);
/* Get the 8.3 name and calculate the checksum */
temp_index = 0;
temp_cluster = *dir_cluster_ptr;
*error_ptr = MFS_lfn_to_sfn(filename_ptr, temp_name);
if ( !*error_ptr )
{
do
{
dir_entry_ptr1 = MFS_Find_directory_entry(drive_ptr, temp_name, &temp_cluster, &temp_index, &temp_prev_cluster, MFS_ATTR_ANY, error_ptr);
if ( !*error_ptr && dir_entry_ptr1 != NULL )
{
MFS_increment_lfn(temp_name);
temp_index = 0;
}
} while ( !*error_ptr && dir_entry_ptr1 != NULL );
dir_entry_ptr = MFS_Find_directory_entry(drive_ptr, "", &entry_cluster, &dir_index, &prev_cluster, attribute, error_ptr);
/*
** The memory should be cleared after finding the directory entry.
*/
_mem_zero(dir_entry_ptr, sizeof (MFS_DIR_ENTRY));
/* Setup the final slot */
((MFS_LNAME_ENTRY_PTR) dir_entry_ptr)->ID |= MFS_LFN_END;
drive_ptr->DIR_SECTOR_DIRTY = TRUE;
MFS_Expand_dotfile(temp_name,short_name);
checksum = MFS_lfn_checksum(short_name);
}
while ( length && !*error_ptr )
{
i = length - ((length -1) % 13 + 1);
*error_ptr = MFS_lfn_name_to_entry(filename_ptr + i, (MFS_LNAME_ENTRY_PTR) dir_entry_ptr);
/* Set the entry number, the checksum value and the attribute */
((MFS_LNAME_ENTRY_PTR) dir_entry_ptr)->ID |= (length + 12) / 13;
((MFS_LNAME_ENTRY_PTR) dir_entry_ptr)->ALIAS_CHECKSUM= checksum;
((MFS_LNAME_ENTRY_PTR) dir_entry_ptr)->ATTR = MFS_ATTR_LFN;
drive_ptr->DIR_SECTOR_DIRTY = TRUE;
length -= (length - i);
if ( length < 0 )
{
length = 0;
}
if ( length && !*error_ptr )
{
dir_entry_ptr = MFS_Find_directory_entry(drive_ptr, "", &entry_cluster, &dir_index, &prev_cluster, attribute, error_ptr);
if ( dir_entry_ptr == NULL && !*error_ptr )
{
/* No empty spots... We need to get a new cluster */
dir_index = 0;
if ( entry_cluster == 0 )
{
*error_ptr = MFS_ROOT_DIR_FULL;
return(NULL);
}
else
{
*error_ptr = MFS_Add_cluster_to_chain( drive_ptr, entry_cluster, &entry_cluster);
if ( *error_ptr == MFS_NO_ERROR )
{
*error_ptr = MFS_Clear_cluster(drive_ptr, entry_cluster);
if ( *error_ptr )
{
return(NULL);
}
dir_entry_ptr = (pointer) drive_ptr->DIR_SECTOR_PTR;
*error_ptr = MFS_Write_back_fat(drive_ptr);
if ( *error_ptr )
{
return(NULL);
}
}
}
}
_mem_zero(dir_entry_ptr, sizeof (MFS_DIR_ENTRY));
drive_ptr->DIR_SECTOR_DIRTY = TRUE;
}
}
/* LFN is written, so write the actual entry */
if ( !*error_ptr )
{
dir_entry_ptr = MFS_Find_directory_entry(drive_ptr, "", &entry_cluster, &dir_index, &prev_cluster, attribute, error_ptr);
if ( dir_entry_ptr == NULL && !*error_ptr )
{
dir_index = 0;
if ( entry_cluster == 0 )
{
*error_ptr = MFS_ROOT_DIR_FULL;
return(NULL);
}
else
{
*error_ptr = MFS_Add_cluster_to_chain( drive_ptr, entry_cluster, &entry_cluster);
if ( *error_ptr == MFS_NO_ERROR )
{
*error_ptr = MFS_Clear_cluster(drive_ptr, entry_cluster);
if ( *error_ptr )
{
return(NULL);
}
dir_entry_ptr = (pointer) drive_ptr->DIR_SECTOR_PTR;
*error_ptr = MFS_Write_back_fat(drive_ptr);
if ( *error_ptr )
{
return(NULL);
}
}
}
}
_mem_zero(dir_entry_ptr, sizeof (MFS_DIR_ENTRY));
htodc(dir_entry_ptr->ATTRIBUTE, attribute);
MFS_Expand_dotfile(temp_name, dir_entry_ptr->NAME);
_time_get(&time);
_time_to_date(&time, &clk_time);
NORMALIZE_DATE(&clk_time);
htods(dir_entry_ptr->TIME, PACK_TIME(clk_time));
htods(dir_entry_ptr->DATE, PACK_DATE(clk_time));
drive_ptr->DIR_SECTOR_DIRTY = TRUE;
}
}
if ( *error_ptr )
{
return(NULL);
}
}
*dir_cluster_ptr = entry_cluster;
*dir_index_ptr = dir_index;
return(dir_entry_ptr);
}
