<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def default_stream_factory( total_content_length, filename, content_type, content_length=None ):
 """The stream factory that is used per default."""

    max_size = 1024 * 500
    if SpooledTemporaryFile is not None:
        return SpooledTemporaryFile(max_size=max_size, mode="wb+")
    if total_content_length is None or total_content_length > max_size:
        return TemporaryFile("wb+")
    return BytesIO()