public static FileStream Open(FileDataStream ads, FileMode mode, FileAccess access, FileShare share)
{
if (ads.Type != FileDataStreamType.Data)
{
throw new InvalidOperationException("Only $DATA streams can be opened for reading or writing.");
}
if (ads.Name.Length == 0) // default stream
{
return(ads.File.Open(mode, access, share));
}
var(nmode, nflags) = ManagedToNative(mode);
var naccess = ManagedToNative(access);
var nshare = ManagedToNative(share);
var lpFileName = $"{ads.File.FullName}:{ads.Name}";
var hFile = Interop.CreateFileW(lpFileName, naccess, nshare, IntPtr.Zero, nmode, nflags, IntPtr.Zero);
if (hFile == Interop.INVALID_HANDLE_VALUE)
{
ThrowErrorAsException(Marshal.GetLastWin32Error(), lpFileName);
return(null);
}
return(new FileStream(new SafeFileHandle(hFile, true), access, 4096, true));
}
public static void Delete(FileDataStream ads)
{
if (ads.Type != FileDataStreamType.Data)
{
throw new InvalidOperationException("Only $DATA streams can be deleted.");
}
if (ads.Name.Length == 0) // default stream
{
ads.File.Delete();
return;
}
var lpFileName = $"{ads.File.FullName}:{ads.Name}";
if (!Interop.DeleteFileW(lpFileName))
{
ThrowErrorAsException(Marshal.GetLastWin32Error(), lpFileName);
}
}
