Return an |_IfdEntry| subclass instance containing the tag and value
        of the tag parsed from *stream_rdr* at *offset*. Note this method is
        common to all subclasses. Override the ``_parse_value()`` method to
        provide distinctive behavior based on field type.

def from_stream(cls, stream_rdr, offset):
        """
        Return an |_IfdEntry| subclass instance containing the tag and value
        of the tag parsed from *stream_rdr* at *offset*. Note this method is
        common to all subclasses. Override the ``_parse_value()`` method to
        provide distinctive behavior based on field type.
        """
        tag_code = stream_rdr.read_short(offset, 0)
        value_count = stream_rdr.read_long(offset, 4)
        value_offset = stream_rdr.read_long(offset, 8)
        value = cls._parse_value(
            stream_rdr, offset, value_count, value_offset
        )
        return cls(tag_code, value)