update

MySolution/STcpHelper/Utility/SBufferHelper.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Text;
+using System.Threading.Tasks;
+using STcpHelper.Packet;
+
+namespace STcpHelper.Utility
+{
+    internal class SBufferHelper
+    {
+        public static byte[] GetBuffer(int size, params byte[][] args)
+        {
+            byte[] bytes = new byte[size];
+            int cursor = 0;
+
+            for (int i = 0; i < args.Length; i++)
+            {
+                byte[] data = args[i];
+
+                Array.Copy(data, 0, bytes, cursor, data.Length);
+                cursor += data.Length;
+            }
+
+            return bytes;
+        }
+
+        public static byte[] ConvertPacketTypeToBuffer(PacketType packetType)
+        {
+            return BitConverter.GetBytes(IPAddress.HostToNetworkOrder((int)packetType));
+        }
+
+        public static byte[] ConvertDataLengthToBuffer(int dataLength)
+        {
+            return BitConverter.GetBytes(IPAddress.HostToNetworkOrder(dataLength));
+        }
+
+        public static int ConvertBufferToDataLength(byte[] dataBuffer, int cursor)
+        {
+            return IPAddress.NetworkToHostOrder(BitConverter.ToInt32(dataBuffer, cursor));
+        }
+    }
+}