packet structure

MySolution/STcpHelper/Packet/STcpPacketHeader.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace STcpHelper.Packet
+{
+    /// <summary>
+    /// 4byte header
+    /// </summary>
+    public class STcpPacketHeader : ISTcpPacket
+    {
+        public PacketType Type { get; private set; }
+        public short DataLength { get; private set; }
+
+        public STcpPacketHeader(PacketType type, int dataLength)
+        {
+            Type = type;
+            DataLength = (short)dataLength;
+        }
+
+        public STcpPacketHeader(byte[] buffer)
+        {
+            int cursor = 0;
+            this.Type = (PacketType)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(buffer, cursor));
+            cursor += 2;
+
+            this.DataLength = IPAddress.NetworkToHostOrder(BitConverter.ToInt16(buffer, cursor));
+        }
+
+        // [2bytes Type][2bytes Size]
+        public byte[] Serialize()
+        {
+            byte[] type = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((short)this.Type));
+            byte[] size = BitConverter.GetBytes(IPAddress.HostToNetworkOrder(this.DataLength));
+
+            return SBufferHelper.GetBuffer(type.Length + size.Length, type, size);
+        }
+    }
+}