tcpipSocket/Chat/Core/ChatPacket.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;

namespace Core
{
	public class ChatPacket : IPacket
	{
		public string Message { get; private set; }
		public string NickName { get; private set; }

		public ChatPacket(string nickname, string message)
		{
			NickName = nickname;
			Message = message;
		}

		public ChatPacket(byte[] buffer)
		{
			int cursor = 2;

			short messageSize = IPAddress.NetworkToHostOrder(BitConverter.ToInt16(buffer, cursor));
			cursor += sizeof(short);

			Message = Encoding.UTF8.GetString(buffer, cursor, messageSize);
			cursor += messageSize;

			short nicknameSize = IPAddress.NetworkToHostOrder(BitConverter.ToInt16(buffer, cursor));
			cursor += sizeof(short);

			NickName = Encoding.UTF8.GetString(buffer, cursor, nicknameSize);
		}

		public byte[] Serialize()
		{
			// 2bytes header
			// data: 2bytes packetType + 2bytes id size + id + 2bytes nickname size + nickname

			byte[] packetType = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((short)PacketType.Chat));
			byte[] message = Encoding.UTF8.GetBytes(Message);
			byte[] messageSize = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((short)message.Length));
			byte[] nickname = Encoding.UTF8.GetBytes(NickName);
			byte[] nicknameSize = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((short)nickname.Length));

			short dataSize = (short)(packetType.Length + message.Length + messageSize.Length + nickname.Length + nicknameSize.Length);
			byte[] header = BitConverter.GetBytes(IPAddress.HostToNetworkOrder(dataSize));

			byte[] buffer = new byte[2 + dataSize];

			int cursor = 0;
			Array.Copy(header, 0, buffer, cursor, header.Length);
			cursor += header.Length;

			Array.Copy(packetType, 0, buffer, cursor, packetType.Length);
			cursor += packetType.Length;

			Array.Copy(messageSize, 0, buffer, cursor, messageSize.Length);
			cursor += messageSize.Length;

			Array.Copy(message, 0, buffer, cursor, message.Length);
			cursor += message.Length;

			Array.Copy(nicknameSize, 0, buffer, cursor, nicknameSize.Length);
			cursor += nicknameSize.Length;

			Array.Copy(nickname, 0, buffer, cursor, nickname.Length);

			return buffer;
		}
	}
}