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   1  <?php
   2  /**
   3   * Zend Framework
   4   *
   5   * LICENSE
   6   *
   7   * This source file is subject to the new BSD license that is bundled
   8   * with this package in the file LICENSE.txt.
   9   * It is also available through the world-wide-web at this URL:
  10   * http://framework.zend.com/license/new-bsd
  11   * If you did not receive a copy of the license and are unable to
  12   * obtain it through the world-wide-web, please send an email
  13   * to [email protected] so we can send you a copy immediately.
  14   *
  15   * @category   Zend
  16   * @package    Zend_Validate
  17   * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
  18   * @license    http://framework.zend.com/license/new-bsd     New BSD License
  19   * @version    $Id$
  20   */
  21  
  22  /**
  23   * @see Zend_Validate_Barcode_AdapterAbstract
  24   */
  25  require_once 'Zend/Validate/Barcode/AdapterAbstract.php';
  26  
  27  /**
  28   * @category   Zend
  29   * @package    Zend_Validate
  30   * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
  31   * @license    http://framework.zend.com/license/new-bsd     New BSD License
  32   */
  33  class Zend_Validate_Barcode_Issn extends Zend_Validate_Barcode_AdapterAbstract
  34  {
  35      /**
  36       * Allowed barcode lengths
  37       * @var integer
  38       */
  39      protected $_length = array(8, 13);
  40  
  41      /**
  42       * Allowed barcode characters
  43       * @var string
  44       */
  45      protected $_characters = '0123456789X';
  46  
  47      /**
  48       * Checksum function
  49       * @var string
  50       */
  51      protected $_checksum = '_gtin';
  52  
  53      /**
  54       * Allows X on length of 8 chars
  55       *
  56       * @param  string $value The barcode to check for allowed characters
  57       * @return boolean
  58       */
  59      public function checkChars($value)
  60      {
  61          if (strlen($value) != 8) {
  62              if (strpos($value, 'X') !== false) {
  63                  return false;
  64              }
  65          }
  66  
  67          return parent::checkChars($value);
  68      }
  69  
  70      /**
  71       * Validates the checksum
  72       *
  73       * @param  string $value The barcode to check the checksum for
  74       * @return boolean
  75       */
  76      public function checksum($value)
  77      {
  78          if (strlen($value) == 8) {
  79              $this->_checksum = '_issn';
  80          } else {
  81              $this->_checksum = '_gtin';
  82          }
  83  
  84          return parent::checksum($value);
  85      }
  86  
  87      /**
  88       * Validates the checksum ()
  89       * ISSN implementation (reversed mod11)
  90       *
  91       * @param  string $value The barcode to validate
  92       * @return boolean
  93       */
  94      protected function _issn($value)
  95      {
  96          $checksum = substr($value, -1, 1);
  97          $values   = str_split(substr($value, 0, -1));
  98          $check    = 0;
  99          $multi    = 8;
 100          foreach($values as $token) {
 101              if ($token == 'X') {
 102                  $token = 10;
 103              }
 104  
 105              $check += ($token * $multi);
 106              --$multi;
 107          }
 108  
 109          $check %= 11;
 110          $check  = 11 - $check;
 111          if ($check == $checksum) {
 112              return true;
 113          } else if (($check == 10) && ($checksum == 'X')) {
 114              return true;
 115          }
 116  
 117          return false;
 118      }
 119  }