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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
*/
/**
* @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;
}
}
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