TLV and TV abstractions complete

src/cfdp/pdu/metadata.rs

@@ -1,15 +1,17 @@
+use crate::cfdp::lv::Lv;
 use crate::cfdp::pdu::{FileDirectiveType, PduHeader};
 use crate::cfdp::ChecksumType;
 
-pub struct MetadataParams {
+pub struct MetadataGenericParams {
     closure_requested: bool,
     checksum_type: ChecksumType,
     file_size: u64,
-    //src_file_name:
 }
 
-pub struct MetadataPdu {
+pub struct MetadataPdu<'src_name, 'dest_name> {
     pdu_header: PduHeader,
     file_directive: FileDirectiveType,
-    metadata_params: MetadataParams,
+    metadata_params: MetadataGenericParams,
+    src_file_name: Option<Lv<'src_name>>,
+    dest_file_name: Option<Lv<'dest_name>>,
 }