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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_Code39 extends Zend_Validate_Barcode_AdapterAbstract
  34  {
  35      /**
  36       * Allowed barcode lengths
  37       * @var integer
  38       */
  39      protected $_length = -1;
  40  
  41      /**
  42       * Allowed barcode characters
  43       * @var string
  44       */
  45      protected $_characters = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ -.$/+%';
  46  
  47      /**
  48       * Checksum function
  49       * @var string
  50       */
  51      protected $_checksum = '_code39';
  52  
  53      /**
  54       * @var array
  55       */
  56      protected $_check = array(
  57          '0' =>  0, '1' =>  1, '2' =>  2, '3' =>  3, '4' =>  4, '5' =>  5, '6' =>  6,
  58          '7' =>  7, '8' =>  8, '9' =>  9, 'A' => 10, 'B' => 11, 'C' => 12, 'D' => 13,
  59          'E' => 14, 'F' => 15, 'G' => 16, 'H' => 17, 'I' => 18, 'J' => 19, 'K' => 20,
  60          'L' => 21, 'M' => 22, 'N' => 23, 'O' => 24, 'P' => 25, 'Q' => 26, 'R' => 27,
  61          'S' => 28, 'T' => 29, 'U' => 30, 'V' => 31, 'W' => 32, 'X' => 33, 'Y' => 34,
  62          'Z' => 35, '-' => 36, '.' => 37, ' ' => 38, '$' => 39, '/' => 40, '+' => 41,
  63          '%' => 42,
  64      );
  65  
  66      /**
  67       * Constructor
  68       *
  69       * Sets check flag to false.
  70       *
  71       * @return void
  72       */
  73      public function __construct()
  74      {
  75          $this->setCheck(false);
  76      }
  77  
  78      /**
  79       * Validates the checksum (Modulo 43)
  80       *
  81       * @param  string $value The barcode to validate
  82       * @return boolean
  83       */
  84      protected function _code39($value)
  85      {
  86          $checksum = substr($value, -1, 1);
  87          $value    = str_split(substr($value, 0, -1));
  88          $count    = 0;
  89          foreach($value as $char) {
  90              $count += $this->_check[$char];
  91          }
  92  
  93          $mod = $count % 43;
  94          if ($mod == $this->_check[$checksum]) {
  95              return true;
  96          }
  97  
  98          return false;
  99      }
 100  }