PacketCompression

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace PangyaAPI
{
    public static class PacketCompression
    {
        public static byte[] GeneratePacketId(byte key)
        {
            string keyCriptografia = (Convert.ToInt32(key) + 1).ToString();

            ProcessStartInfo pInfo = new ProcessStartInfo();
            pInfo.CreateNoWindow = false;
            pInfo.UseShellExecute = false;
            pInfo.FileName = @"C:\PangyaCompress\test\Project2.exe";
            pInfo.Arguments = $"0100E271D24D000000110000 {keyCriptografia}";
            pInfo.WindowStyle = ProcessWindowStyle.Hidden;
            pInfo.RedirectStandardOutput = true;
            pInfo.RedirectStandardError = true;

            string output = String.Empty;

            using (Process p = Process.Start(pInfo))
            {
                p.WaitForExit();

                var exitCode = p.ExitCode;
                output = p.StandardOutput.ReadToEnd();
                var error = p.StandardError.ReadToEnd();

                if (output.Length > 0)
                {
                    // you have some output
                }

                if (error.Length > 0)
                {
                    // you have some error details
                }

            }

            return StringToByteArray(output.Remove(8, output.Length - 8));
        }


        public enum TipoOperacao
        {
            Compress = 1,
            Decompress = 2
        }

        //Decompress
        public static byte[] Compress(byte[] packet, TipoOperacao operacao)
        {
            var packetStr = ConvertToString(packet);

            ProcessStartInfo pInfo = new ProcessStartInfo();
            pInfo.CreateNoWindow = false;
            pInfo.UseShellExecute = false;
            pInfo.FileName = @"C:\PangyaCompress\compression\Project2.exe";
            pInfo.Arguments = $"{(int)operacao} {packetStr}";
            pInfo.WindowStyle = ProcessWindowStyle.Hidden;
            pInfo.RedirectStandardOutput = true;
            pInfo.RedirectStandardError = true;

            string output = String.Empty;

            using (Process p = Process.Start(pInfo))
            {
                p.WaitForExit();

                var exitCode = p.ExitCode;
                output = p.StandardOutput.ReadToEnd();
                var error = p.StandardError.ReadToEnd();

                if (output.Length > 0)
                {
                    // you have some output
                }

                if (error.Length > 0)
                {
                    // you have some error details
                }

            }

            if (operacao == TipoOperacao.Compress)
            {
                //Remove os 4 primeiros bytes pois isto é tratado depois
                output = output.Remove(0, 8);

                //Remove 11 00 00
                output = output.Remove(output.Length - 6, 6);
            }

            //if (returnInHex)
            //    return ConvertToCsharpByteHex(output);

            return StringToByteArray(output);
        }

        //public static byte[] CompressToByte(string packet, byte key)
        //{
        //    return StringToByteArray(Compress(packet, key));
        //}

        public static byte[] StringToByteArray(String hex)
        {
            int NumberChars = hex.Length;
            byte[] bytes = new byte[NumberChars / 2];
            for (int i = 0; i < NumberChars; i += 2)
                bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);
            return bytes;
        }

        private static string ConvertToString(byte[] message)
        {
            return BitConverter.ToString(message).Replace("-", "");
        }

        private static string ConvertToCsharpByteHex(string input)
        {
            StringBuilder sb = new StringBuilder();

            for (int i = 0; i < input.Length; i += 2)
            {
                sb.Append("0x"+input.Substring(i, 2)+", ");
            }

            return sb.ToString();
        }

        public static string GetCsharpStringFromFile(string path)
        {
            string filePath = path;
            return ConvertToCsharpByteHex(ConvertToString(System.IO.File.ReadAllBytes(filePath)));
        }

    }
}