using System;

using System.Collections.Generic;

using System.Text;

using System.Linq;

using System.Threading;

using System.Threading.Tasks;

using System.Net;

using System.IO;

using System.Text.RegularExpressions;

public class Program

{

        private static string GetVersionFromString(string fileVerString)

        {

            if (string.IsNullOrEmpty(fileVerString)) return "";

            fileVerString = fileVerString.ToLower().Replace("_v.", "_v"); // Fix issue when comparing ('NanoKernel_v.1.0.5.6' with 'nano_kernel_v1.0.5.6.bin')

            int verIndex = fileVerString.LastIndexOf("_v");

            if (verIndex == -1) return fileVerString;

            return fileVerString.Substring(verIndex + 1);

        }

        public static bool GetFirmwareUpdate(string currentFwVersion, out string newFwFilename, out string newFwBytes)

        {

​

            newFwFilename = null;

            newFwBytes = null;

​

            currentFwVersion = currentFwVersion ?? "";

​

            // if we don't have the manifest, the fw filename will be null.

            newFwFilename = "nano_kernel_v1.1.0.7.bin";

​

            if (newFwFilename == null)

            {

                return false;

            }

​

            string cleanedFilename = newFwFilename;

            if (Regex.IsMatch(cleanedFilename, @"^.+\.[a-zA-Z]{2,4}$"))

            {

                // Attempt to strip the file extension without affecting the version.

                // Strip off a 2-4 character extension (alpha characters only).

                cleanedFilename = Path.GetFileNameWithoutExtension(cleanedFilename);

            }

            string newVer = GetVersionFromString(cleanedFilename);

            string currentVer = GetVersionFromString(currentFwVersion);

​

            // Only load the firmware file if it's different than the current.

            if (!string.Equals(currentVer, newVer, StringComparison.OrdinalIgnoreCase))

            {

                try

                {

                    newFwBytes = "blah"; //this must be working so mock

                }

                catch (Exception ex)

                {

                    Console.WriteLine($"Failed to load '{newFwFilename}' from disk: {ex.Message}");

                }

            }

​

            return (newFwBytes?.Length > 0);

        }

    public static void Main()

    {

        string currentfw = "nano_kernel_v1.1.0.7";

        string newfw = "";

        string newfwbytes = "";

        if(GetFirmwareUpdate(currentfw, out newfw, out newfwbytes))

        {

            Console.WriteLine("needs update...");

        }

        Console.WriteLine(newfw + " new");

        Console.WriteLine(currentfw + " current");

    }

}