text: <?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
   */
  
  /**
   * @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_Royalmail extends Zend_Validate_Barcode_AdapterAbstract
  {
      /**
       * Allowed barcode lengths
       * @var integer
       */
      protected $_length = -1;
  
      /**
       * Allowed barcode characters
       * @var string
       */
      protected $_characters = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
  
      protected $_rows = array(
          '0' => 1, '1' => 1, '2' => 1, '3' => 1, '4' => 1, '5' => 1,
          '6' => 2, '7' => 2, '8' => 2, '9' => 2, 'A' => 2, 'B' => 2,
          'C' => 3, 'D' => 3, 'E' => 3, 'F' => 3, 'G' => 3, 'H' => 3,
          'I' => 4, 'J' => 4, 'K' => 4, 'L' => 4, 'M' => 4, 'N' => 4,
          'O' => 5, 'P' => 5, 'Q' => 5, 'R' => 5, 'S' => 5, 'T' => 5,
          'U' => 0, 'V' => 0, 'W' => 0, 'X' => 0, 'Y' => 0, 'Z' => 0,
       );
  
      protected $_columns = array(
          '0' => 1, '1' => 2, '2' => 3, '3' => 4, '4' => 5, '5' => 0,
          '6' => 1, '7' => 2, '8' => 3, '9' => 4, 'A' => 5, 'B' => 0,
          'C' => 1, 'D' => 2, 'E' => 3, 'F' => 4, 'G' => 5, 'H' => 0,
          'I' => 1, 'J' => 2, 'K' => 3, 'L' => 4, 'M' => 5, 'N' => 0,
          'O' => 1, 'P' => 2, 'Q' => 3, 'R' => 4, 'S' => 5, 'T' => 0,
          'U' => 1, 'V' => 2, 'W' => 3, 'X' => 4, 'Y' => 5, 'Z' => 0,
      );
  
      /**
       * Checksum function
       * @var string
       */
      protected $_checksum = '_royalmail';
  
      /**
       * Validates the checksum ()
       *
       * @param  string $value The barcode to validate
       * @return boolean
       */
      protected function _royalmail($value)
      {
          $checksum = substr($value, -1, 1);
          $values   = str_split(substr($value, 0, -1));
          $rowvalue = 0;
          $colvalue = 0;
          foreach($values as $row) {
              $rowvalue += $this->_rows[$row];
              $colvalue += $this->_columns[$row];
          }
  
          $rowvalue %= 6;
          $colvalue %= 6;
  
          $rowchkvalue = array_keys($this->_rows, $rowvalue);
          $colchkvalue = array_keys($this->_columns, $colvalue);
          $chkvalue    = current(array_intersect($rowchkvalue, $colchkvalue));
          if ($chkvalue == $checksum) {
              return true;
          }
  
          return false;
      }
  
      /**
       * Allows start and stop tag within checked chars
       *
       * @param  string $value The barcode to check for allowed characters
       * @return boolean
       */
      public function checkChars($value)
      {
          if ($value[0] == '(') {
              $value = substr($value, 1);
  
              if ($value[strlen($value) - 1] == ')') {
                  $value = substr($value, 0, -1);
              } else {
                  return false;
              }
          }
  
          return parent::checkChars($value);
      }
  }
  