<?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) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @version    $Id: Code93.php 20785 2010-01-31 09:43:03Z mikaelkael $

 */

/**

 * @see Zend_Validate_Barcode_AdapterAbstract

 */

require_once 'Zend/Validate/Barcode/AdapterAbstract.php';

/**

 * @category   Zend

 * @package    Zend_Validate

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

class Zend_Validate_Barcode_Code93 extends Zend_Validate_Barcode_AdapterAbstract

{

    /**

     * Allowed barcode lengths

     * @var integer

     */

    protected $_length = -1;

    /**

     * Allowed barcode characters

     * @var string

     */

    protected $_characters = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ -.$/+%';

    /**

     * Checksum function

     * @var string

     */

    protected $_checksum = '_code93';

    /**

     * Note that the characters !"§& are only synonyms

     * @var array

     */

    protected $_check = array(

        '0' =>  0, '1' =>  1, '2' =>  2, '3' =>  3, '4' =>  4, '5' =>  5, '6' =>  6,

        '7' =>  7, '8' =>  8, '9' =>  9, 'A' => 10, 'B' => 11, 'C' => 12, 'D' => 13,

        'E' => 14, 'F' => 15, 'G' => 16, 'H' => 17, 'I' => 18, 'J' => 19, 'K' => 20,

        'L' => 21, 'M' => 22, 'N' => 23, 'O' => 24, 'P' => 25, 'Q' => 26, 'R' => 27,

        'S' => 28, 'T' => 29, 'U' => 30, 'V' => 31, 'W' => 32, 'X' => 33, 'Y' => 34,

        'Z' => 35, '-' => 36, '.' => 37, ' ' => 38, '$' => 39, '/' => 40, '+' => 41,

        '%' => 42, '!' => 43, '"' => 44, '§' => 45, '&' => 46,

    );

    /**

     * Constructor

     *

     * Sets check flag to false.

     *

     * @return void

     */

    public function __construct()

    {

        $this->setCheck(false);

    }

    /**

     * Validates the checksum (Modulo CK)

     *

     * @param  string $value The barcode to validate

     * @return boolean

     */

    protected function _code93($value)

    {

        $checksum = substr($value, -2, 2);

        $value    = str_split(substr($value, 0, -2));

        $count    = 0;

        $length   = count($value) % 20;

        foreach($value as $char) {

            if ($length == 0) {

                $length = 20;

            }

            $count += $this->_check[$char] * $length;

            --$length;

        }

        $check   = array_search(($count % 47), $this->_check);

        $value[] = $check;

        $count   = 0;

        $length  = count($value) % 15;

        foreach($value as $char) {

            if ($length == 0) {

                $length = 15;

            }

            $count += $this->_check[$char] * $length;

            --$length;

        }

        $check .= array_search(($count % 47), $this->_check);

        if ($check == $checksum) {

            return true;

        }

        return false;

    }

}