private static async Task <LinkedList <HttpFileInfo> > FindUpdatesInfo(String applicationDirectory, ManualResetEvent cancelEvent, GameSettingsControl gameSettings)
{
Downloader downloader = new Downloader(cancelEvent);
String[] urls = gameSettings.DownloadMirrors;
LinkedList <HttpFileInfo> list = new LinkedList <HttpFileInfo>();
Dictionary <String, LinkedListNode <HttpFileInfo> > dic = new Dictionary <String, LinkedListNode <HttpFileInfo> >(urls.Length);
foreach (String url in urls)
{
try
{
HttpFileInfo fileInfo = await downloader.GetRemoteFileInfo(url);
if (fileInfo == null)
{
continue;
}
Int32 separatorIndex = url.LastIndexOf('/');
String remoteFileName = url.Substring(separatorIndex + 1);
fileInfo.TargetName = remoteFileName;
fileInfo.TargetPath = Path.Combine(applicationDirectory, remoteFileName);
LinkedListNode <HttpFileInfo> node;
if (!dic.TryGetValue(fileInfo.TargetPath, out node) && File.Exists(fileInfo.TargetPath) && File.GetLastWriteTime(fileInfo.TargetPath) >= fileInfo.LastModified)
{
continue;
}
if (node != null)
{
if (node.Value.LastModified >= fileInfo.LastModified)
{
continue;
}
LinkedListNode <HttpFileInfo> newNode = list.AddBefore(node, fileInfo);
list.Remove(node);
dic[fileInfo.TargetPath] = newNode;
}
else
{
LinkedListNode <HttpFileInfo> newNode = list.AddLast(fileInfo);
dic.Add(fileInfo.TargetPath, newNode);
}
}
catch
{
// Do nothing
}
}
return(list);;
}
public async Task <HttpFileInfo> GetRemoteFileInfo(string url)
{
HttpFileInfo result = new HttpFileInfo();
if (_cancelEvent.WaitOne(0))
{
return(result);
}
WebRequest request = WebRequest.Create(url);
request.Method = "HEAD";
using (WebResponse resp = await request.GetResponseAsync())
{
if (_cancelEvent.WaitOne(0))
{
return(result);
}
result.ReadFromResponse(url, resp);
return(result);
}
}