class download{
    
    var $properties = array(    
		'old_name' => '',
		'new_name' => '',
		'type' => '',
		'size' => '',
		'resume' => '',
		'max_speed' => ''
	);

	var $range = 0;

    function download($path, $name = '', $resume = 0, $max_speed = 0){

       $name = ($name == '') ? substr(strrchr('/'.$path.'/'),1) : $name;
	   $name = explode("/", $name);
	   $name = end ($name);
	   
	   $file_size = filesize($path);
	   
	   $this->properties =  array(
			'old_name' => $path, 
			'new_name' => $name,
			'type'=> "application/force-download",
			'size' => $file_size,
			'resume' => $resume, 
			'max_speed' => $max_speed
		);
	   
	   if ($this->properties['resume']) {
		   
		   if(isset($_SERVER['HTTP_RANGE'])) {
			   
			   $this->range = $_SERVER['HTTP_RANGE'];
			   $this->range = str_replace("bytes=", "", $this->range);
			   $this->range = str_replace("-", "", $this->range);
			} else {
				$this->range = 0;
			}
			
			if ($this->range > $this->properties['size']) $this->range = 0;
			
		} else {
			
			$this->range = 0;
		}
	}
    
   
    function download_file(){
		
		if ($this->range) {
			header($_SERVER['SERVER_PROTOCOL']." 206 Partial Content");
		} else {
			header($_SERVER['SERVER_PROTOCOL']." 200 OK");
		}
		
		header("Pragma: public");
		header("Expires: 0");
		header("Cache-Control:");
		header("Cache-Control: public");
		header("Content-Description: File Transfer");
		header("Content-Type: ".$this->properties["type"]);
		header('Content-Disposition: attachment; filename="'.$this->properties['new_name'].'";');
		header("Content-Transfer-Encoding: binary");
		
		if ($this->properties['resume']) header("Accept-Ranges: bytes");
		if ($this->range) {
			header("Content-Range: bytes {$this->range}-".($this->properties['size']-1)."/".$this->properties['size']);
			header("Content-Length: ".($this->properties['size']-$this->range));
		} else {
			header("Content-Length: ".$this->properties['size']);
		}
           
		@ini_set('max_execution_time', 0);
		@set_time_limit();

		$this->_download($this->properties['old_name'], $this->range);
    }

	function _download ($filename, $range =0) {

		@ob_end_clean();

		if (($speed = $this->properties['max_speed']) > 0)
			$sleep_time = (8 / $speed) * 1e6;
		else
			$sleep_time = 0;

		$handle = fopen($filename, 'rb');
		fseek($handle,$range);

		if ($handle === false)
		{
			return false;
		}

		while (!feof($handle))
		{
			print (fread($handle, 1024*8));
			ob_flush();
			flush();
			usleep($sleep_time);
		}

		fclose($handle);

		return true;
	}

}