$firstPageID = str_pad( $this->firstPageWritten, 9, "0", STR_PAD_LEFT );
$lastPageID = str_pad( $this->lastPageWritten, 9, "0", STR_PAD_LEFT );
$filenamesCount = count( $filenameList );
$firstPageID = str_pad( $this->firstPageWritten, 9, "0", STR_PAD_LEFT );
$lastPageID = str_pad( $this->lastPageWritten, 9, "0", STR_PAD_LEFT );
$filenamesCount = count( $filenameList );