public static DownloadData Create(string url, string destFolder) { DownloadData downloadData = new DownloadData(); WebRequest req = GetRequest(url); try { if (req is FtpWebRequest) { // get the file size for FTP files req.Method = WebRequestMethods.Ftp.GetFileSize; downloadData.response = req.GetResponse(); downloadData.GetFileSize(); // new request for downloading the FTP file req = GetRequest(url); downloadData.response = req.GetResponse(); } else { downloadData.response = req.GetResponse(); downloadData.GetFileSize(); } } catch (Exception e) { throw new Exception(string.Format("Error downloading \"{0}\": {1}", url, e.Message), e); } // Check to make sure the response isn't an error. If it is this method // will throw exceptions. ValidateResponse(downloadData.response, url); // Take the name of the file given to use from the web server. string fileName = downloadData.response.Headers["Content-Disposition"]; if (fileName != null) { int fileLoc = fileName.IndexOf("filename=", StringComparison.OrdinalIgnoreCase); if (fileLoc != -1) { // go past "filename=" fileLoc += 9; if (fileName.Length > fileLoc) { // trim off an ending semicolon if it exists int end = fileName.IndexOf(';', fileLoc); if (end == -1) { end = fileName.Length - fileLoc; } else { end -= fileLoc; } fileName = fileName.Substring(fileLoc, end).Trim(); } else { fileName = null; } } else { fileName = null; } } if (string.IsNullOrEmpty(fileName)) { // brute force the filename from the url fileName = Path.GetFileName(downloadData.response.ResponseUri.LocalPath); } // trim out non-standard filename characters if (!string.IsNullOrEmpty(fileName) && fileName.IndexOfAny(invalidFilenameChars.ToArray()) != -1) { //make a new string builder (with at least one bad character) StringBuilder newText = new StringBuilder(fileName.Length - 1); //remove the bad characters for (int i = 0; i < fileName.Length; i++) { if (invalidFilenameChars.IndexOf(fileName[i]) == -1) { newText.Append(fileName[i]); } } fileName = newText.ToString().Trim(); } // if filename *still* is null or empty, then generate some random temp filename if (string.IsNullOrEmpty(fileName)) { fileName = Path.GetFileName(Path.GetTempFileName()); } string downloadTo = Path.Combine(destFolder, fileName); downloadData.Filename = downloadTo; // If we don't know how big the file is supposed to be, // we can't resume, so delete what we already have if something is on disk already. if (!downloadData.IsProgressKnown && File.Exists(downloadTo)) { File.Delete(downloadTo); } if (downloadData.IsProgressKnown && File.Exists(downloadTo)) { // We only support resuming on http requests if (!(downloadData.Response is HttpWebResponse)) { File.Delete(downloadTo); } else { // Try and start where the file on disk left off downloadData.start = new FileInfo(downloadTo).Length; // If we have a file that's bigger than what is online, then something // strange happened. Delete it and start again. if (downloadData.start > downloadData.size) { File.Delete(downloadTo); } else if (downloadData.start < downloadData.size) { // Try and resume by creating a new request with a new start position downloadData.response.Close(); req = GetRequest(url); ((HttpWebRequest)req).AddRange((int)downloadData.start); downloadData.response = req.GetResponse(); if (((HttpWebResponse)downloadData.Response).StatusCode != HttpStatusCode.PartialContent) { // They didn't support our resume request. File.Delete(downloadTo); downloadData.start = 0; } } } } return(downloadData); }
// Begin downloading the file at the specified url, and save it to the given folder. void BeginDownload() { DownloadData data = null; FileStream fs = null; try { //start the stopwatch for speed calc sw.Start(); // get download details waitingForResponse = true; data = DownloadData.Create(url, destFolder); waitingForResponse = false; //reset the adler downloadedAdler32.Reset(); DownloadingTo = data.Filename; if (!File.Exists(DownloadingTo)) { // create the file fs = File.Open(DownloadingTo, FileMode.Create, FileAccess.Write); } else { // read in the existing data to calculate the adler32 if (Adler32 != 0) { GetAdler32(DownloadingTo); } // apend to an existing file (resume) fs = File.Open(DownloadingTo, FileMode.Append, FileAccess.Write); } // create the download buffer byte[] buffer = new byte[BufferSize]; int readCount; // update how many bytes have already been read sentSinceLastCalc = data.StartPoint; //for BPS calculation while ((readCount = data.DownloadStream.Read(buffer, 0, BufferSize)) > 0) { // break on cancel if (bw.CancellationPending) { data.Close(); fs.Close(); break; } // update total bytes read data.StartPoint += readCount; // update the adler32 value if (Adler32 != 0) { downloadedAdler32.Update(buffer, 0, readCount); } // save block to end of file fs.Write(buffer, 0, readCount); //calculate download speed calculateBps(data.StartPoint, data.TotalDownloadSize); // send progress info if (!bw.CancellationPending) { bw.ReportProgress(0, new object[] { //use the realtive progress or the raw progress UseRelativeProgress? InstallUpdate.GetRelativeProgess(0, data.PercentDone) : data.PercentDone, // unweighted percent data.PercentDone, downloadSpeed, ProgressStatus.None, null }); } // break on cancel if (bw.CancellationPending) { data.Close(); fs.Close(); break; } } } catch (UriFormatException e) { throw new Exception(string.Format("Could not parse the URL \"{0}\" - it's either malformed or is an unknown protocol.", url), e); } catch (Exception e) { if (string.IsNullOrEmpty(DownloadingTo)) { throw new Exception(string.Format("Error trying to save file: {0}", e.Message), e); } else { throw new Exception(string.Format("Error trying to save file \"{0}\": {1}", DownloadingTo, e.Message), e); } } finally { if (data != null) { data.Close(); } if (fs != null) { fs.Close(); } } }
public static DownloadData Create(string url, string destFolder) { DownloadData downloadData = new DownloadData(); WebRequest request = GetRequest(url); try { if (request is FtpWebRequest) { request.Method = "SIZE"; downloadData.response = request.GetResponse(); downloadData.GetFileSize(); request = GetRequest(url); downloadData.response = request.GetResponse(); } else { downloadData.response = request.GetResponse(); downloadData.GetFileSize(); } } catch (Exception ex) { throw new Exception($"Error downloading \"{url}\": {ex.Message}", ex); } ValidateResponse(downloadData.response, url); string text = downloadData.response.Headers["Content-Disposition"]; if (text != null) { int num = text.IndexOf("filename=", StringComparison.OrdinalIgnoreCase); if (num != -1) { num += 9; if (text.Length > num) { int num2 = text.IndexOf(';', num); num2 = ((num2 != -1) ? (num2 - num) : (text.Length - num)); text = text.Substring(num, num2).Trim(); } else { text = null; } } else { text = null; } } if (string.IsNullOrEmpty(text)) { text = Path.GetFileName(downloadData.response.ResponseUri.LocalPath); } if (!string.IsNullOrEmpty(text) && text.IndexOfAny(invalidFilenameChars.ToArray()) != -1) { StringBuilder stringBuilder = new StringBuilder(text.Length - 1); for (int i = 0; i < text.Length; i++) { if (invalidFilenameChars.IndexOf(text[i]) == -1) { stringBuilder.Append(text[i]); } } text = stringBuilder.ToString().Trim(); } if (string.IsNullOrEmpty(text)) { text = Path.GetFileName(Path.GetTempFileName()); } string text2 = downloadData.Filename = Path.Combine(destFolder, text); if (!downloadData.IsProgressKnown && File.Exists(text2)) { File.Delete(text2); } if (downloadData.IsProgressKnown && File.Exists(text2)) { if (!(downloadData.Response is HttpWebResponse)) { File.Delete(text2); } else { downloadData.start = new FileInfo(text2).Length; if (downloadData.start > downloadData.size) { File.Delete(text2); } else if (downloadData.start < downloadData.size) { downloadData.response.Close(); request = GetRequest(url); ((HttpWebRequest)request).AddRange((int)downloadData.start); downloadData.response = request.GetResponse(); if (((HttpWebResponse)downloadData.Response).StatusCode != HttpStatusCode.PartialContent) { File.Delete(text2); downloadData.start = 0L; } } } } return(downloadData); }
private void BeginDownload() { DownloadData downloadData = null; FileStream fileStream = null; try { sw.Start(); waitingForResponse = true; downloadData = DownloadData.Create(url, destFolder); waitingForResponse = false; downloadedAdler32.Reset(); DownloadingTo = downloadData.Filename; if (!File.Exists(DownloadingTo)) { fileStream = File.Open(DownloadingTo, FileMode.Create, FileAccess.Write); } else { if (Adler32 != 0) { GetAdler32(DownloadingTo); } fileStream = File.Open(DownloadingTo, FileMode.Append, FileAccess.Write); } byte[] buffer = new byte[4096]; sentSinceLastCalc = downloadData.StartPoint; do { int num; if ((num = downloadData.DownloadStream.Read(buffer, 0, 4096)) <= 0) { return; } if (bw.CancellationPending) { downloadData.Close(); fileStream.Close(); return; } downloadData.StartPoint += num; if (Adler32 != 0) { downloadedAdler32.Update(buffer, 0, num); } fileStream.Write(buffer, 0, num); calculateBps(downloadData.StartPoint, downloadData.TotalDownloadSize); if (!bw.CancellationPending) { bw.ReportProgress(0, new object[5] { UseRelativeProgress?InstallUpdate.GetRelativeProgess(0, downloadData.PercentDone) : downloadData.PercentDone, downloadData.PercentDone, downloadSpeed, ProgressStatus.None, null }); } }while (!bw.CancellationPending); downloadData.Close(); fileStream.Close(); } catch (UriFormatException innerException) { throw new Exception($"Could not parse the URL \"{url}\" - it's either malformed or is an unknown protocol.", innerException); } catch (Exception ex) { if (string.IsNullOrEmpty(DownloadingTo)) { throw new Exception($"Error trying to save file: {ex.Message}", ex); } throw new Exception($"Error trying to save file \"{DownloadingTo}\": {ex.Message}", ex); } finally { downloadData?.Close(); fileStream?.Close(); } }
public static DownloadData Create(string url, string destFolder) { DownloadData downloadData = new DownloadData(); WebRequest req = GetRequest(url); try { if (req is FtpWebRequest) { // get the file size for FTP files req.Method = WebRequestMethods.Ftp.GetFileSize; downloadData.response = req.GetResponse(); downloadData.GetFileSize(); // new request for downloading the FTP file req = GetRequest(url); downloadData.response = req.GetResponse(); } else { downloadData.response = req.GetResponse(); downloadData.GetFileSize(); } } catch (Exception e) { throw new Exception(string.Format("Error downloading \"{0}\": {1}", url, e.Message), e); } // Check to make sure the response isn't an error. If it is this method // will throw exceptions. ValidateResponse(downloadData.response, url); // Take the name of the file given to use from the web server. string fileName = downloadData.response.Headers["Content-Disposition"]; if (fileName != null) { int fileLoc = fileName.IndexOf("filename=", StringComparison.OrdinalIgnoreCase); if (fileLoc != -1) { // go past "filename=" fileLoc += 9; if (fileName.Length > fileLoc) { // trim off an ending semicolon if it exists int end = fileName.IndexOf(';', fileLoc); if (end == -1) end = fileName.Length - fileLoc; else end -= fileLoc; fileName = fileName.Substring(fileLoc, end).Trim(); } else fileName = null; } else fileName = null; } if (string.IsNullOrEmpty(fileName)) { // brute force the filename from the url fileName = Path.GetFileName(downloadData.response.ResponseUri.LocalPath); } // trim out non-standard filename characters if (!string.IsNullOrEmpty(fileName) && fileName.IndexOfAny(invalidFilenameChars.ToArray()) != -1) { //make a new string builder (with at least one bad character) StringBuilder newText = new StringBuilder(fileName.Length - 1); //remove the bad characters for (int i = 0; i < fileName.Length; i++) { if (invalidFilenameChars.IndexOf(fileName[i]) == -1) newText.Append(fileName[i]); } fileName = newText.ToString().Trim(); } // if filename *still* is null or empty, then generate some random temp filename if (string.IsNullOrEmpty(fileName)) fileName = Path.GetFileName(Path.GetTempFileName()); string downloadTo = Path.Combine(destFolder, fileName); downloadData.Filename = downloadTo; // If we don't know how big the file is supposed to be, // we can't resume, so delete what we already have if something is on disk already. if (!downloadData.IsProgressKnown && File.Exists(downloadTo)) File.Delete(downloadTo); if (downloadData.IsProgressKnown && File.Exists(downloadTo)) { // We only support resuming on http requests if (!(downloadData.Response is HttpWebResponse)) { File.Delete(downloadTo); } else { // Try and start where the file on disk left off downloadData.start = new FileInfo(downloadTo).Length; // If we have a file that's bigger than what is online, then something // strange happened. Delete it and start again. if (downloadData.start > downloadData.size) File.Delete(downloadTo); else if (downloadData.start < downloadData.size) { // Try and resume by creating a new request with a new start position downloadData.response.Close(); req = GetRequest(url); ((HttpWebRequest)req).AddRange((int)downloadData.start); downloadData.response = req.GetResponse(); if (((HttpWebResponse)downloadData.Response).StatusCode != HttpStatusCode.PartialContent) { // They didn't support our resume request. File.Delete(downloadTo); downloadData.start = 0; } } } } return downloadData; }