Allow to retrieve ReaderSegments object from reader objects

capnp/src/message.rs

@@ -298,6 +298,11 @@ where
     pub fn size_in_words(&self) -> usize {
         self.arena.size_in_words()
     }
+
+    /// Retrieves the underlying [`ReaderSegments`] object.
+    pub fn get_segments(&self) -> &S {
+        self.arena.get_segments()
+    }
 }
 
 /// A message reader whose value is known to be of type `T`.
@@ -330,6 +335,11 @@ where
     pub fn into_inner(self) -> Reader<S> {
         self.message
     }
+
+    /// Retrieves the underlying [`ReaderSegments`] object.
+    pub fn get_segments(&self) -> &S {
+        self.message.get_segments()
+    }
 }
 
 impl<S, T> From<Reader<S>> for TypedReader<S, T>

capnp/src/private/arena.rs

@@ -82,6 +82,10 @@ where
     pub fn into_segments(self) -> S {
         self.segments
     }
+
+    pub(crate) fn get_segments(&self) -> &S {
+        &self.segments
+    }
 }
 
 impl<S> ReaderArena for ReaderArenaImpl<S>