kill-LF

/*
 * Created by SharpDevelop & Notepad++
 * Date: 2019.08.21.
 * Time: 10:13
 *
 * 0x0A byte-ok cseréje 0x20 byte-ra
 *
 */
using System;
using System.IO;
using System.Collections.Generic;

namespace kill_LF
{
    class Program
    {
        public static void Main(string[] args)
        {
            if ( args.Length == 2 )
            {
                Console.WriteLine(args[0]+" "+args[1]);
                // Environment.CurrentDirectory
                string[] exes = Directory.GetFiles(args[0], args[1]);
                foreach (string file in exes)
                {
                    Console.WriteLine(Path.GetFileName(file));
                    DoIt(file);
                }
            } else {
                System.Console.WriteLine(@"Fordítás: 'c:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe kill_LF.cs'");
                System.Console.WriteLine( "Használat: kill_LF.exe paraméter-1 paraméter-2");
                System.Console.WriteLine( "   Paraméterek:\n\t1. útvonal (aktuális könyvtár: '.')\n\t2. fájlnév (*.dat)\n");
            }
            Console.Write("\nPress any key to continue . . . ");
            Console.ReadKey(true);
        } // Main()


        public static void DoIt(String filename)
        {
            /* Too long way for read...
            FileInfo f = new FileInfo(filename);
            byte[] buffer = new byte[f.Length];
            using (FileStream stream = new FileStream(f.FullName, FileMode.Open))
            {
                using (BinaryReader reader = new BinaryReader(stream))
                {
                    if ( buffer.Length != reader.Read(buffer,0,buffer.Length) )
                    {
                        System.Console.WriteLine("Hiba törpént...?");
                    }
                }
            }
            */
            // The fast way for read...
            byte[] buffer = File.ReadAllBytes(filename);
            File.WriteAllBytes(filename.Replace(".dat",".dat.old"), buffer);

            int rownum = 0;
            var lfCount = new List<Int32>();
            int lastItem = 0;
            //byte[] newbuffer = new byte[f.Length];
            for(int i=1; i<buffer.Length; i++)
            {
                if ( buffer[i-1]==13 && buffer[i]==10 )
                {
                    rownum++;
                }
                if ( buffer[i-1]!=13 && buffer[i]==10 )
                {
                    lfCount.Add(i);
                    buffer[i] = 32;
                    //newbuffer[i] = 32;
                    System.Console.WriteLine("\t"+lfCount.Count+". érintett sor száma: "+rownum+", karakterszám: "+i+" ("+(i-lastItem)+")");
                    lastItem = i;
                    continue;
                } else {
                    //newbuffer[i-lfCount.Count] = buffer[i];
                }
            }

            if ( lfCount.Count > 0 )
            {
                /* Too long way for write...
                using (FileStream stream = new FileStream(filename.Replace(".dat","_new.dat"),FileMode.Create))
                {
                    using (BinaryWriter writer = new BinaryWriter(stream))
                    {
                        //buffer = newbuffer;
                        writer.Write(buffer);
                        writer.Close();
                    } // using
                } // using
                */
                // The fast way for write...
                File.WriteAllBytes(filename, buffer);
            } else {
                File.Delete(filename.Replace(".dat",".dat.old"));
            } // if

        } // DoIt()

    } // class

} // namespace