public static async Task <bool> ScanAndRepairFile(GameFileInfo fileInfo, string gameFilePath, IProgress <ScanSubProgress> progress = null, int concurrentDownload = 0, CancellationToken ct = default) { var filePath = Path.Combine(gameFilePath, fileInfo.FileName); //#1 Check File ct.ThrowIfCancellationRequested(); progress?.Report(new ScanSubProgress(ScanSubProgressStep.Check, 0)); Progress <double> subProgressCheck = null; if (progress != null) { subProgressCheck = new Progress <double>(); subProgressCheck.ProgressChanged += (o, d) => { progress.Report(new ScanSubProgress( ScanSubProgressStep.Check, d)); }; } if (await RunFileCheck(filePath, fileInfo.Size, fileInfo.Crc32, ct, subProgressCheck)) { progress?.Report(new ScanSubProgress(ScanSubProgressStep.End, 100)); return(true); } //#2 Download File ct.ThrowIfCancellationRequested(); progress?.Report(new ScanSubProgress(ScanSubProgressStep.Download, 0)); var tempFileName = Path.Combine(GameScannerTempPath, $"{fileInfo.FileName.GetHashCode():X4}.tmp"); if (File.Exists(tempFileName)) { File.Delete(tempFileName); } var fileDownloader = concurrentDownload == 1 ? (IFileDownloader) new SimpleFileDownloader(fileInfo.HttpLink, tempFileName) : new ChunkFileDownloader(fileInfo.HttpLink, tempFileName, GameScannerTempPath, concurrentDownload); if (progress != null) { fileDownloader.ProgressChanged += (sender, eventArg) => { switch (fileDownloader.State) { case FileDownloaderState.Invalid: case FileDownloaderState.Download: progress.Report(new ScanSubProgress( ScanSubProgressStep.Download, fileDownloader.DownloadProgress * 0.99, new ScanDownloadProgress(fileDownloader.DownloadSize, fileDownloader.BytesDownloaded, fileDownloader.DownloadSpeed))); break; case FileDownloaderState.Finalize: progress.Report(new ScanSubProgress( ScanSubProgressStep.Download, 99, new ScanDownloadProgress(fileDownloader.DownloadSize, fileDownloader.BytesDownloaded, 0))); break; case FileDownloaderState.Complete: progress.Report(new ScanSubProgress( ScanSubProgressStep.Download, 100, new ScanDownloadProgress(fileDownloader.DownloadSize, fileDownloader.BytesDownloaded, 0))); break; case FileDownloaderState.Error: case FileDownloaderState.Abort: break; default: throw new ArgumentOutOfRangeException(nameof(fileDownloader.State), fileDownloader.State, null); } } } ; await fileDownloader.DownloadAsync(ct); //#3 Check Downloaded File ct.ThrowIfCancellationRequested(); Progress <double> subProgressCheckDown = null; if (progress != null) { progress.Report(new ScanSubProgress(ScanSubProgressStep.CheckDownload, 0)); subProgressCheckDown = new Progress <double>(); subProgressCheckDown.ProgressChanged += (o, d) => { progress.Report(new ScanSubProgress( ScanSubProgressStep.CheckDownload, d)); }; } try { await EnsureValidGameFile(tempFileName, fileInfo.BinSize, fileInfo.BinCrc32, ct, subProgressCheckDown); } catch { if (File.Exists(tempFileName)) { File.Delete(tempFileName); } throw; } //#4 Extract downloaded file ct.ThrowIfCancellationRequested(); if (L33TZipUtils.IsL33TZip(tempFileName)) { var tempFileName2 = $"{tempFileName.Replace(".tmp", string.Empty)}.ext.tmp"; // Progress <double> extractProgress = null; if (progress != null) { progress.Report(new ScanSubProgress( ScanSubProgressStep.ExtractDownload, 0)); extractProgress = new Progress <double>(); extractProgress.ProgressChanged += (o, d) => { progress.Report(new ScanSubProgress( ScanSubProgressStep.ExtractDownload, d)); }; } await L33TZipUtils.DecompressL33TZipAsync(tempFileName, tempFileName2, extractProgress, ct); //#4.1 Check Extracted File ct.ThrowIfCancellationRequested(); Progress <double> subProgressCheckExt = null; if (progress != null) { progress.Report(new ScanSubProgress( ScanSubProgressStep.CheckExtractDownload, 0)); subProgressCheckExt = new Progress <double>(); subProgressCheckExt.ProgressChanged += (o, d) => { progress.Report(new ScanSubProgress( ScanSubProgressStep.CheckExtractDownload, d)); }; } await EnsureValidGameFile(tempFileName2, fileInfo.Size, fileInfo.Crc32, ct, subProgressCheckExt); File.Delete(tempFileName); tempFileName = tempFileName2; } //#5 Move new file to game folder ct.ThrowIfCancellationRequested(); progress?.Report(new ScanSubProgress( ScanSubProgressStep.Finalize, 0)); if (File.Exists(filePath)) { File.Delete(filePath); } else { var pathName = Path.GetDirectoryName(filePath); if (!string.IsNullOrEmpty(pathName) && !Directory.Exists(pathName)) { Directory.CreateDirectory(pathName); } } File.Move(tempFileName, filePath); //#6 End progress?.Report(new ScanSubProgress( ScanSubProgressStep.End, 100)); return(true); }