Packet.cs

using GameServerCore.Content;
using GameServerCore.Domain.GameObjects;
using GameServerCore.Packets.PacketDefinitions;
using PacketDefinitions420.PacketDefinitions;
using System;
using System.Collections.Generic;
using System.Text;

namespace PacketDefinitions420
{
    public class Packet : IPacket
    {
        protected List<byte> _bytes = new List<byte>();

        public Packet(PacketCmd cmd)
        {
            Write((byte)cmd);
        }

        public byte[] GetBytes()
        {
            return _bytes.ToArray();
        }

        public void Fill(byte data, int length)
        {
            if (length <= 0)
            {
                return;
            }

            var arr = new byte[length];
            for (var i = 0; i < length; ++i)
            {
                arr[i] = data;
            }

            Write(arr);
        }

        public void Write(bool b)
        {
            Write((byte)(b ? 1u : 0u));
        }

        public void Write(byte b)
        {
            _bytes.Add(b);
        }

        public void Write(byte[] b)
        {
            _bytes.AddRange(b);
        }

        public void Write(short s)
        {
            var arr = new byte[2];
            for (var i = 0; i < 2; i++)
            {
                arr[i] = (byte)(s >> (i * 8));
            }

            Write(arr);
        }

        public void Write(ushort s)
        {
            var arr = new byte[2];
            for (var i = 0; i < 2; i++)
            {
                arr[i] = (byte)(s >> (i * 8));
            }

            Write(arr);
        }

        public void Write(int n)
        {
            var arr = new byte[4];
            for (var i = 0; i < 4; i++)
            {
                arr[i] = (byte)(n >> (i * 8));
            }

            Write(arr);
        }

        public void Write(uint n)
        {
            var arr = new byte[4];
            for (var i = 0; i < 4; i++)
            {
                arr[i] = (byte)(n >> (i * 8));
            }

            Write(arr);
        }

        public void Write(long l)
        {
            var arr = new byte[8];
            for (var i = 0; i < 8; i++)
            {
                arr[i] = (byte)(l >> (i * 8));
            }

            Write(arr);
        }

        public void Write(ulong l)
        {
            var arr = new byte[8];
            for (var i = 0; i < 8; i++)
            {
                arr[i] = (byte)(l >> (i * 8));
            }

            Write(arr);
        }

        public void Write(float f)
        {
            Write(BitConverter.GetBytes(f));
        }

        public void Write(double d)
        {
            Write(BitConverter.GetBytes(d));
        }

        public void Write(string s)
        {
            Write(Encoding.UTF8.GetBytes(s));
        }

        public void WriteConstLengthString(string str, int length, bool overrideMaxLength = false)
        {
            if (str.Length > length && !overrideMaxLength)
            {
                str = str.Substring(0, length);
            }

            Write(str);
            Fill(0, length - str.Length);
        }

        public void WriteStringHash(string str)
        {
            Write(HashFunctions.HashString(str));
        }

        public void WriteNetId(IGameObject obj)
        {
            if (obj == null)
            {
                Write(0u);
            }
            else
            {
                Write(obj.NetId);
            }
        }
    }
}