Started working on the deserializer.

crates/node/src/serde_blocktree/de.rs

@@ -0,0 +1,26 @@
+use std::io::Read;
+use super::error::{Error, Result, MapError};
+
+pub struct Deserializer<'de, T: Read> {
+    input: &'de T,
+}
+
+impl<'de, T: Read> Deserializer<'de, T> {
+    pub fn new(input: &'de T) -> Self {
+        Deserializer { input: input }
+    }
+}
+
+mod test {
+    #[allow(unused_imports)]
+    use super::{Result, Deserializer};
+    
+    #[test]
+    fn new() -> Result<()> {
+        let vec = vec![0xA1];
+        let slice = &vec.as_slice();
+        let de = Deserializer::new(slice);
+        assert_eq!(slice, de.input);
+        Ok(())
+    }
+}