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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category  Zend
  * @package   Zend_TimeSync
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license   http://framework.zend.com/license/new-bsd     New BSD License
  * @version   $Id$
  */
 
 /**
  * Zend_TimeSync_Protocol
  */
 // require_once 'Zend/TimeSync/Protocol.php';
 
 /**
  * SNTP Protocol handling class
  *
  * @category  Zend
  * @package   Zend_TimeSync
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license   http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_TimeSync_Sntp extends Zend_TimeSync_Protocol
 {
     /**
      * Port number for this timeserver
      *
      * @var integer
      */
     protected $_port = 37;
 
     /**
      * Socket delay
      *
      * @var integer
      */
     private $_delay;
 
     /**
      * Class constructor, sets the timeserver and port number
      *
      * @param string  $timeserver Timeserver to connect to
      * @param integer $port       Port of the timeserver when it differs from the default port
      */
     public function __construct($timeserver, $port)
     {
         $this->_timeserver = 'udp://' . $timeserver;
         if ($port !== null) {
             $this->_port = $port;
         }
     }
 
     /**
      * Prepares the data that will be send to the timeserver
      *
      * @return array
      */
     protected function _prepare()
     {
         return "\n";
     }
 
     /**
      * Reads the data returned from the timeserver
      *
      * @return string
      */
     protected function _read()
     {
         $result       = fread($this->_socket, 49);
         $this->_delay = (($this->_delay - time()) / 2);
 
         return $result;
     }
 
     /**
      * Writes data to to the timeserver
      *
      * @param  string $data Data to write to the timeserver
      * @return void
      */
     protected function _write($data)
     {
         $this->_connect();
         $this->_delay = time();
         fputs($this->_socket, $data);
     }
 
     /**
      * Extracts the data returned from the timeserver
      *
      * @param  string $result Data to extract
      * @return integer
      */
     protected function _extract($result)
     {
         $dec   = hexdec('7fffffff');
         $time  = abs(($dec - hexdec(bin2hex($result))) - $dec);
         $time -= 2208988800;
         // Socket delay
         $time -= $this->_delay;
 
         $this->_info['offset'] = $this->_delay;
 
         return $time;
     }
 }