Content::getContentRange

private function getContentRange()
{
	$contentRange = $this->request->getHeader('Content-Range');
	if ($contentRange === null)
	{
		return false;
	}

	if (!preg_match("/(\d+)-(\d+)\/(\d+)$/", $contentRange, $match))
	{
		return null;
	}

	return [(int)$match[1], (int)$match[2], (int)$match[3]];
}