(C#) DecodeNDT

DecodeNDT.cs

/*
 * Project Name:    DecodeNDT
 * Descripton:      Decodes NDT files from Atlantica Online
 *                  Ported from Python to C# by Doğan Çelik
 *                  Originally from: http://bit.ly/kilEew
 */

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;

namespace DecodeNDT
{
    class Program
    {
        const int HEADER_SIZE = 0x18;

        static void Main(string[] args)
        {
            foreach (var file in args)
            {
                if (File.Exists(file))
                {
                    Console.WriteLine("File found: " + file);

                    byte[] buffer = File.ReadAllBytes(file);

                    ArraySegment<byte> segment = new ArraySegment<byte>(buffer, 12, 2);

                    ushort seed = segment.Array[segment.Offset];

                    List<byte> output = new List<byte>();

                    for (int i = HEADER_SIZE; i < buffer.Length - 1; i++)
                    {
                        int x = ((buffer[i] - seed) & 0xFF) ^ (buffer[i + 1]);

                        output.Add((byte)x);
                    }

                    string filename = Path.GetFileNameWithoutExtension(file) + ".txt";

                    try
                    {
                        BinaryWriter bw = new BinaryWriter(new FileStream(filename, FileMode.Create, FileAccess.ReadWrite));
                        bw.Write(output.ToArray());
                        bw.Close();
                    }
                    catch (Exception e)
                    {
                        Console.WriteLine("Couldn't write file:" + filename + "\nError message: " + e.Message);
                    }     
                }
                else Console.WriteLine("File not found: " + file);
            }

            Console.ReadLine();
        }
    }
}