void bw_DoWork(object sender, DoWorkEventArgs e)
{
// validate input
if (urlList == null || urlList.Count == 0)
{
if (string.IsNullOrEmpty(url))
{
//no sites specified, bail out
if (!bw.CancellationPending)
{
bw.ReportProgress(0, new object[] { -1, -1, string.Empty, ProgressStatus.Failure, new Exception("No download URLs are specified.") });
}
return;
}
//single site specified, add it to the list
urlList = new List <string> {
url
};
}
// use the custom proxy if provided
if (CustomProxy != null)
{
WebRequest.DefaultWebProxy = CustomProxy;
}
else
{
IWebProxy proxy = WebRequest.GetSystemWebProxy();
if (proxy.Credentials == null)
{
proxy.Credentials = CredentialCache.DefaultNetworkCredentials;
}
WebRequest.DefaultWebProxy = proxy;
}
if (DownloadAll)
{
totalDownloadSize = 0;
totalBytesDownloaded = 0;
foreach (string s in urlList)
{
long size = DownloadData.GetFileSize(s);
if (size > -1)
{
totalDownloadSize += size;
}
}
}
else
{
totalDownloadSize = -1;
}
// try each url in the list until one succeeds
bool allFailedWaitingForResponse = true;
Exception ex = null;
foreach (string s in urlList)
{
CurrentURLIndex = urlList.IndexOf(s);
ex = null;
try
{
url = s;
BeginDownload();
ValidateDownload();
}
catch (Exception except)
{
ex = except;
if (!waitingForResponse)
{
allFailedWaitingForResponse = false;
}
}
// If we got through that without an exception, we found a good url
if (!DownloadAll && (ex == null || bw.CancellationPending))
{
allFailedWaitingForResponse = false;
break;
}
}
/*
* If all the sites failed before a response was received then either the
* internet connection is shot, or the Proxy is shot. Either way it can't
* hurt to try downloading without the proxy:
*/
if (allFailedWaitingForResponse && WebRequest.DefaultWebProxy != null)
{
// try the sites again without a proxy
WebRequest.DefaultWebProxy = null;
foreach (string s in urlList)
{
ex = null;
try
{
url = s;
BeginDownload();
ValidateDownload();
}
catch (Exception except)
{
ex = except;
}
// If we got through that without an exception, we found a good url
if (ex == null || bw.CancellationPending)
{
break;
}
}
}
// Process complete (either successfully or failed), report back
if (bw.CancellationPending || ex != null)
{
bw.ReportProgress(0, new object[] { -1, -1, string.Empty, ProgressStatus.Failure, ex });
}
else
{
bw.ReportProgress(0, new object[] { -1, -1, string.Empty, ProgressStatus.Success, null });
}
}
// 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;
if (DownloadAll)
{
totalBytesDownloaded += 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
if (DownloadAll)
{
calculateBps(totalBytesDownloaded, totalDownloadSize);
}
else
{
calculateBps(data.StartPoint, data.TotalDownloadSize);
}
// send progress info
if (!bw.CancellationPending)
{
if (DownloadAll)
{
int percentDone = (int)((totalBytesDownloaded * 100) / totalDownloadSize);
bw.ReportProgress(0, new object[] {
//use the realtive progress or the raw progress
UseRelativeProgress?
InstallUpdate.GetRelativeProgess(0, percentDone) :
percentDone,
// unweighted percent
percentDone,
downloadSpeed, ProgressStatus.None, null
});
}
else
{
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}\n\n{1}", e.Message, e.StackTrace), 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 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);
}
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;
}
