4 files changed, 126 insertions, 0 deletions
diff --git a/net/src/codec/bytes_codec.rs b/net/src/codec/bytes_codec.rs
new file mode 100644
index 0000000..b319e53
--- /dev/null
+++ b/net/src/codec/bytes_codec.rs
@@ -0,0 +1,29 @@
+use crate::{
+    codec::{Codec, Decoder, Encoder},
+    Result,
+};
+
+#[derive(Clone)]
+pub struct BytesCodec {}
+impl Codec for BytesCodec {
+    type Item = Vec<u8>;
+}
+
+impl Encoder for BytesCodec {
+    type EnItem = Vec<u8>;
+    fn encode(&self, src: &Self::EnItem, dst: &mut [u8]) -> Result<usize> {
+        dst[..src.len()].copy_from_slice(src);
+        Ok(src.len())
+    }
+}
+
+impl Decoder for BytesCodec {
+    type DeItem = Vec<u8>;
+    fn decode(&self, src: &mut [u8]) -> Result<Option<(usize, Self::DeItem)>> {
+        if src.is_empty() {
+            Ok(None)
+        } else {
+            Ok(Some((src.len(), src.to_vec())))
+        }
+    }
+}
diff --git a/net/src/codec/length_codec.rs b/net/src/codec/length_codec.rs
new file mode 100644
index 0000000..76a1679
--- /dev/null
+++ b/net/src/codec/length_codec.rs
@@ -0,0 +1,49 @@
+use karyon_core::util::{decode, encode_into_slice};
+
+use crate::{
+    codec::{Codec, Decoder, Encoder},
+    Result,
+};
+
+/// The size of the message length.
+const MSG_LENGTH_SIZE: usize = std::mem::size_of::<u32>();
+
+#[derive(Clone)]
+pub struct LengthCodec {}
+impl Codec for LengthCodec {
+    type Item = Vec<u8>;
+}
+
+impl Encoder for LengthCodec {
+    type EnItem = Vec<u8>;
+    fn encode(&self, src: &Self::EnItem, dst: &mut [u8]) -> Result<usize> {
+        let length_buf = &mut [0; MSG_LENGTH_SIZE];
+        encode_into_slice(&(src.len() as u32), length_buf)?;
+        dst[..MSG_LENGTH_SIZE].copy_from_slice(length_buf);
+        dst[MSG_LENGTH_SIZE..src.len() + MSG_LENGTH_SIZE].copy_from_slice(src);
+        Ok(src.len() + MSG_LENGTH_SIZE)
+    }
+}
+
+impl Decoder for LengthCodec {
+    type DeItem = Vec<u8>;
+    fn decode(&self, src: &mut [u8]) -> Result<Option<(usize, Self::DeItem)>> {
+        if src.len() < MSG_LENGTH_SIZE {
+            return Ok(None);
+        }
+
+        let mut length = [0; MSG_LENGTH_SIZE];
+        length.copy_from_slice(&src[..MSG_LENGTH_SIZE]);
+        let (length, _) = decode::<u32>(&length)?;
+        let length = length as usize;
+
+        if src.len() - MSG_LENGTH_SIZE >= length {
+            Ok(Some((
+                length + MSG_LENGTH_SIZE,
+                src[MSG_LENGTH_SIZE..length + MSG_LENGTH_SIZE].to_vec(),
+            )))
+        } else {
+            Ok(None)
+        }
+    }
+}
diff --git a/net/src/codec/mod.rs b/net/src/codec/mod.rs
new file mode 100644
index 0000000..565cb07
--- /dev/null
+++ b/net/src/codec/mod.rs
@@ -0,0 +1,25 @@
+mod bytes_codec;
+mod length_codec;
+mod websocket;
+
+pub use bytes_codec::BytesCodec;
+pub use length_codec::LengthCodec;
+pub use websocket::{WebSocketCodec, WebSocketDecoder, WebSocketEncoder};
+
+use crate::Result;
+
+pub trait Codec:
+    Decoder<DeItem = Self::Item> + Encoder<EnItem = Self::Item> + Send + Sync + 'static + Unpin
+{
+    type Item: Send + Sync;
+}
+
+pub trait Encoder {
+    type EnItem;
+    fn encode(&self, src: &Self::EnItem, dst: &mut [u8]) -> Result<usize>;
+}
+
+pub trait Decoder {
+    type DeItem;
+    fn decode(&self, src: &mut [u8]) -> Result<Option<(usize, Self::DeItem)>>;
+}
diff --git a/net/src/codec/websocket.rs b/net/src/codec/websocket.rs
new file mode 100644
index 0000000..b59a55c
--- /dev/null
+++ b/net/src/codec/websocket.rs
@@ -0,0 +1,23 @@
+use crate::Result;
+use async_tungstenite::tungstenite::Message;
+
+pub trait WebSocketCodec:
+    WebSocketDecoder<DeItem = Self::Item>
+    + WebSocketEncoder<EnItem = Self::Item>
+    + Send
+    + Sync
+    + 'static
+    + Unpin
+{
+    type Item: Send + Sync;
+}
+
+pub trait WebSocketEncoder {
+    type EnItem;
+    fn encode(&self, src: &Self::EnItem) -> Result<Message>;
+}
+
+pub trait WebSocketDecoder {
+    type DeItem;
+    fn decode(&self, src: &Message) -> Result<Self::DeItem>;
+}