protected function _checkEncoding($data, $tag)
{
if (is_resource($data)) {
stream_filter_register('horde_null', 'Horde_Stream_Filter_Null');
stream_filter_register('horde_eol', 'Horde_Stream_Filter_Eol');
$this->_streamFilters[] = stream_filter_prepend($data, 'horde_null', STREAM_FILTER_READ);
$this->_streamFilters[] = stream_filter_prepend($data, 'horde_eol', STREAM_FILTER_READ);
}
return $data;
}