BiomePainter.Update.updateTextFile C# (CSharp) Method

        private void updateTextFile(int buttonId, String url, String path, String filename, String description, Button button, PictureBox pic, ref String newContents)
        {
            enableButtons(false);
            shouldBeEnabled[buttonId] = false;

            if (readyToGo[buttonId])
            {
                readyToGo[buttonId] = false;

                if (newContents == null)
                {
                    MessageBox.Show(this, "Sorry, no data found. Please close the update window and try again.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    enableButtons(true);
                    pic.Image = Properties.Resources.x;
                    return;
                }

                button.Text = String.Format("Writing updates to {0}.", filename);
                button.Refresh();

                using (StreamWriter sw = new StreamWriter(path, false))
                {
                    sw.Write(newContents);
                    sw.Close();
                }

                button.Text = String.Format("You now have the latest {0}.", description);
                pic.Image = Properties.Resources.check;
                if (buttonId == Blocks)
                {
                    ColorPalette.Reset();
                    ColorPalette.Preload();
                }
                else if (buttonId == Biomes)
                {
                    BiomeType.Reset();
                    ((Form1)Owner).FillLists();
                }

                enableButtons(true);
                return;
            }

            enableButtons(false);
            shouldBeEnabled[buttonId] = false;
            button.Text = String.Format("Checking for updates to {0}.", filename);
            button.Refresh();

            String json = null;

            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                request.Method = "GET";
                request.Headers["Accept-Encoding"] = "gzip,deflate";
                request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
                request.UserAgent = userAgent;
                request.Proxy = null;

                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                StreamReader responseStream = new StreamReader(response.GetResponseStream());
                json = responseStream.ReadToEnd();
                response.Close();
                responseStream.Close();
            }
            catch (Exception)
            {
                button.Text = "Unable to connect to GitHub. Please try again later.";
                shouldBeEnabled[buttonId] = true;
                readyToGo[buttonId] = false;
                enableButtons(true);
                pic.Image = Properties.Resources.x;
                return;
            }

            json = json.Replace("\\n", "");

            String serverSha = new Regex("[\"']sha[\"']: ?\"([^\"']+)[\"']", RegexOptions.IgnoreCase | RegexOptions.Multiline).Match(json).Groups[1].Value;

            byte[] raw = File.ReadAllBytes(path);
            byte[] head = Encoding.UTF8.GetBytes("blob " + raw.Length.ToString() + "\0");
            byte[] combined = new byte[head.Length + raw.Length];
            head.CopyTo(combined, 0);
            raw.CopyTo(combined, head.Length);

            SHA1 sha1 = new SHA1CryptoServiceProvider();
            String localSha = BitConverter.ToString(sha1.ComputeHash(combined)).Replace("-", "").ToLower();

            if (serverSha == localSha)
            {
                button.Text = String.Format("You have the latest {0}. No action is necessary.", description);
                shouldBeEnabled[buttonId] = false;
                readyToGo[buttonId] = false;
                enableButtons(true);
                pic.Image = Properties.Resources.check;
            }
            else
            {
                newContents = new Regex("[\"']content[\"']: ?\"([^\"']+)[\"']", RegexOptions.IgnoreCase | RegexOptions.Multiline).Match(json).Groups[1].Value;
                newContents = Encoding.UTF8.GetString(Convert.FromBase64String(newContents));
                button.Text = String.Format("Updated {0} available! Click to save a new copy of {1}.", description, filename);
                shouldBeEnabled[buttonId] = true;
                readyToGo[buttonId] = true;
                enableButtons(true);
                pic.Image = Properties.Resources.bang;
            }
        }