void WriteStream <T>(IInStream <T> source, IIOStream <IInStream <T> > dest, int index)
{
if (dest.Length < (index + 1))
{
dest.Length = index + 1;
}
using (var w = dest.GetWriter())
{
w.Position = index;
if (source == null)
{
w.Write(StreamUtils.GetEmptyStream <T>());
}
else
{
w.Write(source);
}
}
}