fix decode null

Author: TroyKomodo

crates/amf0/src/de/mod.rs

@@ -146,7 +146,10 @@ where
             Amf0Marker::String | Amf0Marker::LongString | Amf0Marker::XmlDocument => {
                 self.decode_string()?.into_deserializer().deserialize_any(visitor)
             }
-            Amf0Marker::Null | Amf0Marker::Undefined => visitor.visit_unit(),
+            Amf0Marker::Null | Amf0Marker::Undefined => {
+                self.decode_null()?;
+                visitor.visit_unit()
+            },
             Amf0Marker::Object | Amf0Marker::TypedObject | Amf0Marker::EcmaArray => {
                 let header = self.decode_object_header()?;
                 match header {

crates/amf0/src/encoder.rs

@@ -112,7 +112,10 @@ where
     }
 
     pub(crate) fn encode_object_trailer(&mut self) -> Result<(), Amf0Error> {
-        self.writer.write_u24::<BigEndian>(Amf0Marker::ObjectEnd as u32)?;
+        // Final object key length is 0
+        self.writer.write_u16::<BigEndian>(0)?;
+        // Followed by object end
+        self.writer.write_u8(Amf0Marker::ObjectEnd as u8)?;
         Ok(())
     }