From 2f131ab25267585bc22cfc9c29a37ec16849eca1 Mon Sep 17 00:00:00 2001
From: Allen Xu <allenxuxu@foxmail.com>
Date: Sun, 3 Apr 2022 10:49:19 +0800
Subject: [PATCH] Fix default protocol

---
 protocol.go      |  3 ++-
 protocol_test.go | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 protocol_test.go

diff --git a/protocol.go b/protocol.go
index f87649b..1a689a2 100644
--- a/protocol.go
+++ b/protocol.go
@@ -28,8 +28,9 @@ func (d *DefaultProtocol) UnPacket(c *Connection, buffer *ringbuffer.RingBuffer)
 
 		copy(userBuffer, s)
 		copy(userBuffer[len(s):], e)
+		buffer.RetrieveAll()
 
-		return nil, userBuffer
+		return nil, userBuffer[:size]
 	} else {
 		buffer.RetrieveAll()
 
diff --git a/protocol_test.go b/protocol_test.go
new file mode 100644
index 0000000..5b18f64
--- /dev/null
+++ b/protocol_test.go
@@ -0,0 +1,36 @@
+package gev
+
+import (
+	"testing"
+
+	"github.com/Allenxuxu/gev/eventloop"
+	"github.com/Allenxuxu/ringbuffer"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDefaultProtocol_UnPacket(t *testing.T) {
+	p := DefaultProtocol{}
+
+	buffer := ringbuffer.New(4)
+	n, err := buffer.Write([]byte("1234"))
+	assert.Equal(t, 4, n)
+	assert.Nil(t, err)
+
+	buffer.Peek(2)
+	buffer.Retrieve(2)
+	n, err = buffer.Write([]byte("ab"))
+	assert.Equal(t, 2, n)
+	assert.Nil(t, err)
+
+	_, data := p.UnPacket(newTmpConnection(), buffer)
+	assert.Equal(t, []byte("34ab"), data)
+
+	assert.Equal(t, 0, buffer.Length())
+}
+
+func newTmpConnection() *Connection {
+	lp, _ := eventloop.New()
+	return &Connection{
+		loop: lp,
+	}
+}