Sonic.exe Exclusive Download Info

// ----------------------------------------------------------------- // Public API – call from UI thread (e.g. button click handler) // ----------------------------------------------------------------- public static async Task DownloadAsync( string downloadUrl, string destinationFilePath, IProgress<(long downloaded, long? total)> progress = null, CancellationToken ct = default) // 1️⃣ Ensure folder exists Directory.CreateDirectory(Path.GetDirectoryName(destinationFilePath));

// If a partial file exists, try to resume if (File.Exists(destinationFilePath)) existingBytes = new FileInfo(destinationFilePath).Length; if (existingBytes > 0 && existingBytes < totalBytes) _http.DefaultRequestHeaders.Range = new System.Net.Http.Headers.RangeHeaderValue(existingBytes, null);

var progress = new Progress<(long downloaded, long? total)>(p => if (p.total.HasValue) double percent = (double)p.downloaded / p.total.Value * 100; progressBar.Value = (int)percent; lblStatus.Text = $"Downloading… percent:F1% (p.downloaded / 1024:#,##0 KB)"; else lblStatus.Text = $"Downloading… p.downloaded / 1024:#,##0 KB"; ); sonic.exe download

// 3️⃣ Stream download using var response = await _http.GetAsync(downloadUrl, HttpCompletionOption.ResponseHeadersRead, ct); response.EnsureSuccessStatusCode();

return response.Content.Headers.ContentLength ?? -1; total)&gt;(p =&gt; if (p

// ------------------------------------------------------------- // Helper: SHA‑256 verification (pass expected hash string or null) // ------------------------------------------------------------- public static async Task VerifyHashAsync(string filePath, string expectedHash = null) using var sha256 = SHA256.Create(); await using var stream = File.OpenRead(filePath); byte[] hash = await sha256.ComputeHashAsync(stream); string computed = BitConverter.ToString(hash).Replace("-", "").ToLowerInvariant();

public MainForm() InitializeComponent(); btnDownload.Click += BtnDownload_Click; progressBar.Value = (int)percent

var savePath = Path.Combine( Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), "Downloads", "sonic.exe");