Class DataTape

a readable/writable stream, a function to (re)open the stream, or a filename.

If stream is a stream (instead of a function or a filename), only one method may be called once. Otherwise, methods can be called, but they must be sequenced because this type is non-thread-safe.

DataTape.Reader methods are available only if the stream is readable. DataTape.Writer methods are available only if the stream is writable.