private IAsyncOperation <ZipFile> OpenZipFileAsync(FileAccessMode accessMode)
{
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 = NativeFileOperationsHelper.OpenFileForRead(ContainerPath, readWrite);
if (hFile.IsInvalid)
{
return null;
}
return new ZipFile((Stream) new FileStream(hFile, readWrite ? FileAccess.ReadWrite : FileAccess.Read));
}
}));
}
public override IAsyncOperation <IRandomAccessStream> OpenAsync(FileAccessMode accessMode)
{
return(AsyncInfo.Run <IRandomAccessStream>(async(cancellationToken) =>
{
bool rw = accessMode == FileAccessMode.ReadWrite;
if (Path == ContainerPath)
{
if (BackingFile != null)
{
return await BackingFile.OpenAsync(accessMode);
}
else
{
var hFile = NativeFileOperationsHelper.OpenFileForRead(ContainerPath, rw);
if (hFile.IsInvalid)
{
return null;
}
return new FileStream(hFile, rw ? FileAccess.ReadWrite : FileAccess.Read).AsRandomAccessStream();
}
}
if (!rw)
{
ZipFile zipFile = await OpenZipFileAsync(accessMode);
if (zipFile == null)
{
return null;
}
zipFile.IsStreamOwner = true;
var znt = new ZipNameTransform(ContainerPath);
var entry = zipFile.GetEntry(znt.TransformFile(Path));
if (entry != null)
{
return new NonSeekableRandomAccessStreamForRead(zipFile.GetInputStream(entry), (ulong)entry.Size)
{
DisposeCallback = () => zipFile.Close()
};
}
}
else
{
var znt = new ZipNameTransform(ContainerPath);
var zipDesiredName = znt.TransformFile(Path);
using (ZipFile zipFile = await OpenZipFileAsync(accessMode))
{
var entry = zipFile.GetEntry(zipDesiredName);
if (entry != null)
{
zipFile.BeginUpdate(new MemoryArchiveStorage(FileUpdateMode.Direct));
zipFile.Delete(entry);
zipFile.CommitUpdate();
}
}
if (BackingFile != null)
{
var zos = new ZipOutputStream((await BackingFile.OpenAsync(FileAccessMode.ReadWrite)).AsStream(), true);
await zos.PutNextEntryAsync(new ZipEntry(zipDesiredName));
return new NonSeekableRandomAccessStreamForWrite(zos);
}
else
{
var hFile = NativeFileOperationsHelper.OpenFileForRead(ContainerPath, true);
if (hFile.IsInvalid)
{
return null;
}
var zos = new ZipOutputStream(new FileStream(hFile, FileAccess.ReadWrite), true);
await zos.PutNextEntryAsync(new ZipEntry(zipDesiredName));
return new NonSeekableRandomAccessStreamForWrite(zos);
}
}
return null;
}));
}
