Fix the NBT decoder panic if length less than 0

nbt/nbt_test.go

@@ -60,7 +60,7 @@ func TestUnmarshal_simple(t *testing.T) {
 	}
 }
 
-func TestUnmarshal_bittest(t *testing.T) {
+func TestUnmarshal_bitTest(t *testing.T) {
 	// Generated by vscode-hexdump
 	data := []byte{
 		0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00,
@@ -306,3 +306,20 @@ func TestUnmarshal_ByteArray(t *testing.T) {
 	}
 	// t.Log(infValue)
 }
+
+func TestUnmarshal_ErrorString(t *testing.T) {
+	var data = []byte{
+		0x08, 0x00, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0xFF, 0xFE,
+		0x42, 0x61, 0x6e, 0x61, 0x6e, 0x72, 0x61, 0x6d, 0x61,
+	}
+
+	//Unmarshal to string
+	var Name string
+	err := Unmarshal(data, &Name)
+
+	if err == nil {
+		t.Error("should return a error if len < 0")
+	}
+	t.Log(err)
+
+}