CWebDavBase::_get_ranges

function _get_ranges(&$options)
{
	if (isset($_SERVER['HTTP_RANGE']))
	{
		if (preg_match('/bytess*=s*(.+)/', $_SERVER['HTTP_RANGE'], $matches))
		{
			$options["ranges"] = array();

			foreach (explode(",", $matches[1]) as $range)
			{
				[$start, $end] = explode("-", $range);
				$options["ranges"][] = ($start==="")
					? array("last"=>$end)
					: array("start"=>$start, "end"=>$end);
			}
		}
	}
}