add BytesCodec

src/codec/bcodec.rs

@@ -0,0 +1,33 @@
+use std::io;
+
+use bytes::{Bytes, BytesMut};
+use tokio_codec::{Decoder, Encoder};
+
+/// Bytes codec.
+///
+/// Reads/Writes chunks of bytes from a stream.
+#[derive(Debug, Copy, Clone)]
+pub struct BytesCodec;
+
+impl Encoder for BytesCodec {
+    type Item = Bytes;
+    type Error = io::Error;
+
+    fn encode(&mut self, item: Bytes, dst: &mut BytesMut) -> Result<(), Self::Error> {
+        dst.extend_from_slice(&item[..]);
+        Ok(())
+    }
+}
+
+impl Decoder for BytesCodec {
+    type Item = BytesMut;
+    type Error = io::Error;
+
+    fn decode(&mut self, src: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> {
+        if src.is_empty() {
+            Ok(None)
+        } else {
+            Ok(Some(src.take()))
+        }
+    }
+}

src/codec/mod.rs

@@ -12,11 +12,13 @@
 
 #![deny(missing_docs, missing_debug_implementations, warnings)]
 
+mod bcodec;
 mod framed;
 mod framed2;
 mod framed_read;
 mod framed_write;
 
+pub use self::bcodec::BytesCodec;
 pub use self::framed::{Framed, FramedParts};
 pub use self::framed2::{Framed2, FramedParts2};
 pub use self::framed_read::FramedRead;