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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_Validate
  * @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    $Id$
  */
 
 /**
  * @see Zend_Validate_Barcode_AdapterAbstract
  */
 // require_once 'Zend/Validate/Barcode/AdapterAbstract.php';
 
 /**
  * @category   Zend
  * @package    Zend_Validate
  * @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_Validate_Barcode_Issn extends Zend_Validate_Barcode_AdapterAbstract
 {
     /**
      * Allowed barcode lengths
      * @var integer
      */
     protected $_length = array(8, 13);
 
     /**
      * Allowed barcode characters
      * @var string
      */
     protected $_characters = '0123456789X';
 
     /**
      * Checksum function
      * @var string
      */
     protected $_checksum = '_gtin';
 
     /**
      * Allows X on length of 8 chars
      *
      * @param  string $value The barcode to check for allowed characters
      * @return boolean
      */
     public function checkChars($value)
     {
         if (strlen($value) != 8) {
             if (strpos($value, 'X') !== false) {
                 return false;
             }
         }
 
         return parent::checkChars($value);
     }
 
     /**
      * Validates the checksum
      *
      * @param  string $value The barcode to check the checksum for
      * @return boolean
      */
     public function checksum($value)
     {
         if (strlen($value) == 8) {
             $this->_checksum = '_issn';
         } else {
             $this->_checksum = '_gtin';
         }
 
         return parent::checksum($value);
     }
 
     /**
      * Validates the checksum ()
      * ISSN implementation (reversed mod11)
      *
      * @param  string $value The barcode to validate
      * @return boolean
      */
     protected function _issn($value)
     {
         $checksum = substr($value, -1, 1);
         $values   = str_split(substr($value, 0, -1));
         $check    = 0;
         $multi    = 8;
         foreach($values as $token) {
             if ($token == 'X') {
                 $token = 10;
             }
 
             $check += ($token * $multi);
             --$multi;
         }
 
         $check %= 11;
         $check  = 11 - $check;
         if ($check == $checksum) {
             return true;
         } else if (($check == 10) && ($checksum == 'X')) {
             return true;
         }
 
         return false;
     }
 }