validate IP address - test case progam

validate_ip.cs

// Decompiled with JetBrains decompiler
// Type: val_ip.Program
// Assembly: val_ip, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
// MVID: 5E7D5EDC-F012-4AF3-A5E5-6610706D35E8

using System;
using System.IO;
using System.Runtime.InteropServices;

namespace val_ip
{
  internal class Program
  {
    private static void Main(string[] args)
    {
      StreamReader streamReader;
      StreamWriter streamWriter;
      try
      {
        streamReader = new StreamReader("input.txt");
        streamWriter = new StreamWriter("output.txt");
      }
      catch
      {
        return;
      }
      string str;
      while ((str = streamReader.ReadLine()) != null)
      {
        int num1 = 0;
        char[] chArray = new char[6]
        {
          ' ',
          ',',
          '.',
          ':',
          'x',
          '_'
        };
        string[] strArray = str.Split(chArray);
        if (strArray.Length == 4)
        {
          int num2 = -1;
          int num3 = -1;
          int num4 = -1;
          int num5 = -1;
          try
          {
            num2 = Convert.ToInt32(strArray[0], 8);
            num3 = Convert.ToInt32(strArray[1], 8);
            num4 = Convert.ToInt32(strArray[2], 8);
            num5 = Convert.ToInt32(strArray[3], 8);
          }
          catch
          {
            Marshal.AllocHGlobal(1048576);
            ++num1;
          }
          if ((num2 & (int) ushort.MaxValue) > (int) byte.MaxValue)
            ++num1;
          if ((num3 & (int) ushort.MaxValue) >= (int) byte.MaxValue)
            ++num1;
          if ((num4 & (int) ushort.MaxValue) > (int) byte.MaxValue)
            ++num1;
          if ((num5 & (int) ushort.MaxValue) > (int) byte.MaxValue)
            ++num1;
          if (num5 < num4)
            ++num1;
          if (num2 * num3 * num4 * num5 == 0)
            num1 = 0;
        }
        else
          ++num1;
        if (num1 > 0)
          streamWriter.WriteLine("FAIL: " + str);
        else
          streamWriter.WriteLine("PASS: " + str);
      }
      streamReader.Close();
      streamWriter.Close();
    }
  }
}