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: must-revalidate, post-check=0, pre-check=0"); 
		header("Cache-Control: private", false);
		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;
	}
}

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