start adding CFDP user

satrs-core/src/cfdp/mod.rs

@@ -1,6 +1,28 @@
 use crc::{Crc, CRC_32_CKSUM};
+use spacepackets::util::UnsignedByteField;
 
 pub mod dest;
+pub mod user;
+
+#[derive(Debug, PartialEq, Eq, Copy, Clone)]
+pub struct TransactionId {
+    source_id: UnsignedByteField,
+    seq_num: UnsignedByteField,
+}
+
+impl TransactionId {
+    pub fn new(source_id: UnsignedByteField, seq_num: UnsignedByteField) -> Self {
+        Self { source_id, seq_num }
+    }
+
+    pub fn source_id(&self) -> &UnsignedByteField {
+        &self.source_id
+    }
+
+    pub fn seq_num(&self) -> &UnsignedByteField {
+        &self.seq_num
+    }
+}
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 pub enum TransactionStep {

satrs-core/src/cfdp/user.rs

@@ -0,0 +1,48 @@
+use spacepackets::{
+    cfdp::{
+        pdu::{
+            file_data::RecordContinuationState,
+            finished::{DeliveryCode, FileStatus},
+        },
+        ConditionCode,
+    },
+    util::UnsignedByteField,
+};
+
+use super::TransactionId;
+
+#[derive(Debug, Copy, Clone)]
+pub struct TransactionFinishedParams {
+    pub id: TransactionId,
+    pub condition_code: ConditionCode,
+    pub delivery_code: DeliveryCode,
+    pub file_status: FileStatus,
+}
+
+#[derive(Debug)]
+pub struct MetadataReceivedParams<'src_file, 'dest_file, 'msgs_to_user> {
+    pub id: TransactionId,
+    pub source_id: UnsignedByteField,
+    pub file_size: u64,
+    pub src_file_name: &'src_file str,
+    pub dest_file_name: &'dest_file str,
+    // TODO: This is pretty low-level. Is there a better way to do this?
+    pub msgs_to_user: &'msgs_to_user [u8],
+}
+
+#[derive(Debug)]
+pub struct FileSegmentRecvdParams<'seg_meta> {
+    pub id: TransactionId,
+    pub offset: u64,
+    pub length: usize,
+    pub rec_cont_state: Option<RecordContinuationState>,
+    pub segment_metadata: Option<&'seg_meta [u8]>,
+}
+
+pub trait CfdpUser {
+    fn transaction_indication(&mut self, id: &TransactionId);
+    fn eof_sent_indication(&mut self, id: &TransactionId);
+    fn transaction_finished_indication(&mut self, finished_params: &TransactionFinishedParams);
+    fn metadata_recvd_indication(&mut self, md_recvd_params: &MetadataReceivedParams);
+    fn file_segment_recvd_indication(&mut self, segment_recvd_params: &FileSegmentRecvdParams);
+}