how to best do this..

satrs-core/src/cfdp/dest.rs

@@ -1,6 +1,5 @@
-use spacepackets::cfdp::{pdu::FileDirectiveType, PduType};
-
 use super::{State, TransactionStep};
+use spacepackets::cfdp::{pdu::FileDirectiveType, PduType};
 
 pub struct DestinationHandler {
     step: TransactionStep,
@@ -13,8 +12,29 @@ impl DestinationHandler {
         pdu_type: PduType,
         pdu_directive: Option<FileDirectiveType>,
         raw_packet: &[u8],
-    ) {
+    ) -> Result<(), ()> {
+        match pdu_type {
+            PduType::FileDirective => {
+                if pdu_directive.is_none() {
+                    return Err(());
                 }
+                self.handle_file_directive(pdu_directive.unwrap(), raw_packet)
+            }
+            PduType::FileData => self.handle_file_data(raw_packet),
+        }
+    }
+
+    pub fn handle_file_data(&mut self, raw_packet: &[u8]) -> Result<(), ()> {
+        Ok(())
+    }
+    pub fn handle_file_directive(
+        &mut self,
+        pdu_directive: FileDirectiveType,
+        raw_packet: &[u8],
+    ) -> Result<(), ()> {
+        Ok(())
+    }
+
     pub fn state_machine(&mut self) {
         match self.state {
             State::Idle => todo!(),