Sonic.exe Download ((hot)) · Free

private async void BtnDownload_Click(object sender, EventArgs e) btnDownload.Enabled = false; lblStatus.Text = "Starting download…";

await using var contentStream = await response.Content.ReadAsStreamAsync(ct); await using var fileStream = new FileStream( destinationFilePath, existingBytes > 0 ? FileMode.Append : FileMode.Create, FileAccess.Write, FileShare.None, bufferSize: 81920, useAsync: true);

private static readonly HttpClient _http = new HttpClient() // Timeout can be tuned – 5 minutes is a sensible default. Timeout = TimeSpan.FromMinutes(5) ; sonic.exe download

while ((read = await contentStream.ReadAsync(buffer.AsMemory(0, buffer.Length), ct)) > 0) await fileStream.WriteAsync(buffer.AsMemory(0, read), ct); totalRead += read; progress?.Report((totalRead, totalBytes));

private const string DOWNLOAD_URL = "https://example.com/path/to/sonic.exe"; private const string EXPECTED_SHA256 = "0123456789abcdef..."; // 64‑hex chars Expected expectedHash, got computed

// ------------------------------------------------------------- // 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();

if (!string.IsNullOrWhiteSpace(expectedHash) && !computed.Equals(expectedHash, StringComparison.OrdinalIgnoreCase)) throw new InvalidDataException( $"Hash mismatch! Expected expectedHash, got computed."); progress = null

// ----------------------------------------------------------------- // 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));