private function convertRecord(Record $record)
{
$records = $record->toArray();
$offset = 0;
$fields = array_merge($records['subfield'], $records['datafield']);
$content = [];
$directory = [];
foreach ($fields as $field) {
$result = $field instanceof ControlField ? $this->convertControlField($field) : $this->convertDataField($field);
$content[] = $result;
$length = strlen($result);
$entry = sprintf("%03s%04d%05d", $field->getTag(), $length, $offset);
$directory[] = $entry;
$offset += $length;
}
$base = File_MARC::LEADER_LEN + count($directory) * File_MARC::DIRECTORY_ENTRY_LEN + 1;
$total = $base + $offset + 1;
$record->setLeaderLength($total, $base);
return $record->getLeader() . implode($directory) . File_MARC::END_OF_FIELD . implode($content) . File_MARC::END_OF_RECORD;
}
