private StreamedFileDataRequestedHandler ZipDataStreamingHandler(string name)
{
return(async request =>
{
try
{
// If called from here it fails with Access Denied?!
//var hFile = NativeFileOperationsHelper.OpenFileForRead(ContainerPath);
var hFile = await NativeFileOperationsHelper.OpenProtectedFileForRead(ContainerPath);
if (hFile.IsInvalid)
{
request.FailAndClose(StreamedFileFailureMode.CurrentlyUnavailable);
return;
}
using (ZipFile zipFile = new ZipFile(new FileStream(hFile, FileAccess.Read)))
{
zipFile.IsStreamOwner = true;
var znt = new ZipNameTransform(ContainerPath);
var entry = zipFile.GetEntry(znt.TransformFile(name));
if (entry != null)
{
using (var inStream = zipFile.GetInputStream(entry))
using (var outStream = request.AsStreamForWrite())
{
await inStream.CopyToAsync(outStream);
await outStream.FlushAsync();
}
request.Dispose();
}
else
{
request.FailAndClose(StreamedFileFailureMode.CurrentlyUnavailable);
}
}
}
catch
{
request.FailAndClose(StreamedFileFailureMode.Failed);
}
});
}
private IAsyncOperation <ZipFile> OpenZipFileAsync(FileAccessMode accessMode, bool openProtected = false)
{
return(AsyncInfo.Run <ZipFile>(async(cancellationToken) =>
{
bool readWrite = accessMode == FileAccessMode.ReadWrite;
if (BackingFile != null)
{
return new ZipFile((await BackingFile.OpenAsync(accessMode)).AsStream());
}
else
{
var hFile = openProtected ?
await NativeFileOperationsHelper.OpenProtectedFileForRead(ContainerPath) :
NativeFileOperationsHelper.OpenFileForRead(ContainerPath, readWrite);
if (hFile.IsInvalid)
{
return null;
}
return new ZipFile((Stream) new FileStream(hFile, readWrite ? FileAccess.ReadWrite : FileAccess.Read));
}
}));
}