using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Text;
using System.Threading;
using System.Windows.Forms;

namespace File_Encoder
{
    /// <summary>
    /// Description of MainForm.
    /// </summary>
    public partial class MainForm : Form
    {
        public MainForm()
        {
            //
            // The InitializeComponent() call is required for Windows Forms designer support.
            //
            InitializeComponent();

            //
            // TODO: Add constructor code after the InitializeComponent() call.
            //
        }
         public static string StrToHexStr(string str)
        {
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < str.Length; i++)
            {
                int v = Convert.ToInt32(str[i]);
                sb.Append(string.Format("{0:X2}", v));
            }
            return sb.ToString();
        }

        public static string HexStrToStr(string hexStr)
        {
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < hexStr.Length; i += 2)
            {
                int n = Convert.ToInt32(hexStr.Substring(i, 2), 16);
                sb.Append(Convert.ToChar(n));
            }
            return sb.ToString();
        }

        void Button1Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            if (ofd.ShowDialog() == DialogResult.OK) {
                textBox1.Text = ofd.FileName;

            }
            else{
                MessageBox.Show("No file selected","Error",MessageBoxButtons.OK,MessageBoxIcon.Error    );
            }

        }
        void Button2Click(object sender, EventArgs e)
        {
    if (textBox1.Text == "") {
    MessageBox.Show("No file selected","Error",MessageBoxButtons.OK,MessageBoxIcon.Error    );
    }
            else
            {


                FileStream fs = new FileStream(textBox1.Text,
                                   FileMode.Open,
                                   FileAccess.Read);
    byte[] filebytes = new byte[fs.Length];
    fs.Read(filebytes, 0, Convert.ToInt32(fs.Length));
    string encodedData =
        Convert.ToBase64String(filebytes,
                               Base64FormattingOptions.InsertLineBreaks);
    StreamWriter writer = new StreamWriter(textBox1.Text + ".crypted");

    writer.Write(StrToHexStr(encodedData));
        writer.Close();
        MessageBox.Show("File Crypted","OK",MessageBoxButtons.OK,MessageBoxIcon.Information);

            }
        }
        void Button4Click(object sender, EventArgs e)
        {
    OpenFileDialog ofd = new OpenFileDialog();
            if (ofd.ShowDialog() == DialogResult.OK) {
                textBox2.Text = ofd.FileName;

            }
            else{
                MessageBox.Show("No file selected","Error",MessageBoxButtons.OK,MessageBoxIcon.Error    );
            }
        }
        void Button3Click(object sender, EventArgs e)
        {
    if (textBox2.Text == "") {
    MessageBox.Show("No file selected","Error",MessageBoxButtons.OK,MessageBoxIcon.Error    );
    }
            else
            {
                if (textBox2.Text.Contains(".crypted")) {
                File.WriteAllText(textBox2.Text,HexStrToStr(File.ReadAllText(textBox2.Text)));
                byte[] filebytes = Convert.FromBase64String(File.ReadAllText(textBox2.Text));
                FileStream fs = new FileStream(textBox2.Text.Replace(".crypted",""),
                                   FileMode.CreateNew,
                                   FileAccess.Write,
                                   FileShare.None);
    fs.Write(filebytes, 0, filebytes.Length);
    fs.Close();
        MessageBox.Show("File DeCrypted","OK",MessageBoxButtons.OK,MessageBoxIcon.Information);
                }
                else
                {
                MessageBox.Show("Please Select *.Crypted File","Error",MessageBoxButtons.OK,MessageBoxIcon.Error    );
                }
            }
        }
    }
}