CWebDavBase::SendFile

function SendFile(&$options, $download = null)
{
	if($download == null)
	{
		$download = array_key_exists("force_download", $_REQUEST);
	}

	$status = null;
	if (!headers_sent())
	{
		$fullPath = "";
		if(array_key_exists("logica_full_path", $options))
		{
			$fullPath = $options["logica_full_path"];
		}
		if($this->Type == "iblock" && isset($this->arParams["fullpath"]) && $this->arParams["fullpath"] <> '')
		{
				$fullPath = $this->arParams["fullpath"];
		}
		elseif($this->Type == "folder" && $this->real_path_full <> '')
		{
				$fullPath = $this->real_path_full;
		}

		if($fullPath <> '')
		{
			$arT = self::GetMimeAndGroup($fullPath);
			$options['mimetype'] = $arT["mime"];
		}
		else
		{
			$options['mimetype'] = 'application/octet-stream';
			$download = true;
		}

		/*
		if ($options['mimetype'] == 'application/zip') // fix old magic.mime
			$options['mimetype'] = $this->get_mime_type($options['path']);*/

		if (
			(
				$GLOBALS["APPLICATION"]->IsHTTPS()
				&& mb_substr($options['mimetype'], 0, 11) == "application"
			)
			|| $this->http_user_agent == "ie"
		)
		{
			header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
			header("Pragma: public");
			$options["cache_time"] = 0;
		}

		$status = '200 OK';

		$name = "";
		if (!empty($options["name"]))
		{
			$name = $options["name"];
		}
		else
		{
			$res = explode("/", $this->_udecode($options["path"]));
			$name = end($res);
		}

		if ($this->http_user_agent == "ie")
		{
			$name = $this->_uencode($name, array("utf8" => "Y", "convert" => "full"));
		}
		elseif (SITE_CHARSET != 'UTF-8')
		{
			$name = $GLOBALS['APPLICATION']->ConvertCharset($name, SITE_CHARSET, 'UTF-8');
		}

		self::set_header('Content-type: ' . $options['mimetype']);
		self::set_header('Content-Disposition: filename="'.$name.'"', true);
		self::set_header('ETag: "' . $this->_get_etag() . '"');
		if(array_key_exists("cache_time", $options) && $options["cache_time"] > 0 && mb_substr($options['mimetype'], 0, 6) == "image/")
		{
			//Handle ETag
			if(isset($_SERVER['HTTP_IF_NONE_MATCH']) && $this->_check_etag($_SERVER['HTTP_IF_NONE_MATCH']))
			{
				$this->SetStatus('304 Not Modified');
				self::set_header("Cache-Control: private, max-age=".$options["cache_time"].", pre-check=".$options["cache_time"]);
				die();
			}
			//Handle Last Modified
			if($options["mtime"] > 0)
			{
				$lastModified = gmdate('D, d M Y H:i:s', $options["mtime"]).' GMT';
				if(array_key_exists("HTTP_IF_MODIFIED_SINCE", $_SERVER) && ($_SERVER['HTTP_IF_MODIFIED_SINCE'] === $lastModified))
				{
					$this->SetStatus('304 Not Modified');
					self::set_header("Cache-Control: private, max-age=".$options["cache_time"].", pre-check=".$options["cache_time"]);
					die();
				}
			}
			self::set_header("Cache-Control: private, max-age=".$options["cache_time"].", pre-check=".$options["cache_time"]);
		}

		$userNavigator = CUserOptions::GetOption('webdav', 'navigator', array('platform'=>'Win'));
		if (isset($_SERVER['HTTP_IF_NONE_MATCH']) &&				// for correct save action in MS Office 2010
			$this->_check_etag($_SERVER['HTTP_IF_NONE_MATCH']) &&
			(
				mb_strpos($_SERVER['HTTP_USER_AGENT'], 'Microsoft') !== false &&
				mb_strpos($userNavigator['platform'], 'Win') !== false
				)
		)
		{
			$this->SetStatus('304 Not Modified');
			die();
		}

		if (!$download)
		{
			if($fullPath <> '')
			{
				$download = !self::CanViewFile($fullPath, false);
			}
			else
			{
				$download = true;
			}
		}

		if ($download == true)
		{
			self::set_header('Content-Disposition: attachment; filename="'.$name.'"', true);
		}

		if (isset($options['mtime']))
		{
			self::set_header('Last-modified: '.gmdate('D, d M Y H:i:s ', $options['mtime']).'GMT');
		}

		session_write_close();
		if (isset($options['stream']))
		{
			$sizeO = intval($options['size']);
			$ranges = (isset($options['ranges']) && is_array($options['ranges'])) ? $options['ranges'] : array();
			$this->SendFileFromStream($options['stream'], $options['mimetype'], $sizeO, $ranges);
		}
		elseif (isset($options['data']) && !is_array($options['data']))
		{
			self::set_header('Content-length: ' . $this->strlen($options['data']));
			echo $options['data'];
		}
	}

	return $status;
}