Simplify bcodec decode (#162)

actix-codec/CHANGES.md

@@ -4,6 +4,7 @@
 * Use `.advance()` instead of `.split_to()`.
 * Upgrade `tokio-util` to `0.3`.
 * Improve `BytesCodec` `.encode()` performance
+* Simplify `BytesCodec` `.decode()` 
 
 ## [0.2.0] - 2019-12-10
 

actix-codec/src/bcodec.rs

@@ -27,8 +27,7 @@ impl Decoder for BytesCodec {
         if src.is_empty() {
             Ok(None)
         } else {
-            let len = src.len();
-            Ok(Some(src.split_to(len)))
+            Ok(Some(src.split()))
         }
     }
 }