dep-leaguepackets/LeaguePackets/BasePacket.cs

using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using LeaguePackets.LoadScreen;

namespace LeaguePackets
{
    public abstract class BasePacket
    {
        public byte[] ExtraBytes { get; set; } = new byte[0];

        protected abstract void ReadHeader(ByteReader reader);
        protected abstract void ReadBody(ByteReader reader);
        public void Read(byte[] data)
        {
            using (var reader = new ByteReader(data))
            {
                ReadHeader(reader);
                ReadBody(reader);
                this.ExtraBytes = reader.ReadLeft();
            }
        }

        public static BasePacket Create(byte[] data, ChannelID channel)
        {
            switch (channel)
            {
                case ChannelID.Default:
                    return KeyCheckPacket.Create(data);
                case ChannelID.ClientToServer:
                case ChannelID.SynchClock:
                case ChannelID.Broadcast:
                case ChannelID.BroadcastUnreliable:
                    return GamePacket.Create(data);
                case ChannelID.Chat: {
                        var packet = new Chat();
                        packet.Read(data);
                        return packet;
                    }
                case ChannelID.QuickChat:{
                        var packet = new QuickChat();
                        packet.Read(data);
                        return packet;
                    }
                case ChannelID.LoadingScreen:
                    return LoadScreenPacket.Create(data);
                default:
                    throw new IOException("Unknown packet channel.");
            }
        }

        protected abstract void WriteHeader(ByteWriter writer);
        protected abstract void WriteBody(ByteWriter writer);
        public byte[] GetBytes()
        {
            using(var writer = new ByteWriter())
            {
                WriteHeader(writer);
                WriteBody(writer);
                writer.WriteBytes(this.ExtraBytes);
                return writer.GetBytes();
            }
        }
    }
}