public Packet Deserialize(CircularBuffer<byte> buffer)
        {
            try
            {
                var bytes = new byte[buffer.Size];
                buffer.Peek(bytes, 0, buffer.Size);

                var json = Encoding.UTF8.GetString(bytes);

                var stringReader = new StringReader(json);
                var reader = new JsonTextReader(stringReader);

                // 주의
                var field =
                    stringReader.GetType().GetField(
                        "_pos",
                        System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);

                var depth = 0;
                var id = 0;
                var idField = true;
                var hasObject = false;

                try
                {
                    while (reader.Read())
                    {
                        switch (reader.TokenType)
                        {
                            case JsonToken.StartObject:
                                depth++;
                                hasObject = true;
                                break;
                            case JsonToken.EndObject:
                                depth--;

                                if (depth == 0)
                                    break;
                                break;

                            case JsonToken.PropertyName:
                                if (depth == 1 &&
                                    (String)reader.Value == "id")
                                    idField = true;
                                break;
                            case JsonToken.Integer:
                                if (idField)
                                {
                                    id = Convert.ToInt32(reader.Value);
                                    idField = false;
                                }
                                break;
                        }
                    }
                }
                catch (JsonReaderException e)
                {
                    // ignore
                }


                if (hasObject == false)
                    return null;
                if (depth != 0)
                    return null;

                var count = (int)field.GetValue(stringReader);
                buffer.Skip(count);

                var slicedJson = json.Substring(0, count);

                var packet =
                    (Packet)JsonConvert.DeserializeObject(
                        slicedJson, Packet.GetTypeById(id));

                packet.packetId = id;

                return packet;
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
            return null;
        }