C:/xampp/htdocs/moodle/lib/zend/Zend/Validate/Barcode.php

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<?php
require_once 'Zend/Validate/Abstract.php';

require_once 'Zend/Loader.php';

class Zend_Validate_Barcode extends Zend_Validate_Abstract
{
    const INVALID        = 'barcodeInvalid';
    const FAILED         = 'barcodeFailed';
    const INVALID_CHARS  = 'barcodeInvalidChars';
    const INVALID_LENGTH = 'barcodeInvalidLength';

    protected $_messageTemplates = array(
        self::FAILED         => "'%value%' failed checksum validation",
        self::INVALID_CHARS  => "'%value%' contains invalid characters",
        self::INVALID_LENGTH => "'%value%' should have a length of %length% characters",
        self::INVALID        => "Invalid type given, value should be string",
    );

    protected $_messageVariables = array(
        'length' => '_length'
    );

    protected $_length;

    protected $_adapter;

    public function __construct($adapter)
    {
        if ($adapter instanceof Zend_Config) {
            $adapter = $adapter->toArray();
        }

        $options  = null;
        $checksum = null;
        if (is_array($adapter)) {
            if (array_key_exists('options', $adapter)) {
                $options = $adapter['options'];
            }

            if (array_key_exists('checksum', $adapter)) {
                $checksum = $adapter['checksum'];
            }

            if (array_key_exists('adapter', $adapter)) {
                $adapter = $adapter['adapter'];
            } else {
                require_once 'Zend/Validate/Exception.php';
                throw new Zend_Validate_Exception("Missing option 'adapter'");
            }
        }

        $this->setAdapter($adapter, $options);
        if ($checksum !== null) {
            $this->setChecksum($checksum);
        }
    }

    public function getAdapter()
    {
        return $this->_adapter;
    }

    public function setAdapter($adapter, $options = null)
    {
        $adapter = ucfirst(strtolower($adapter));
        require_once 'Zend/Loader.php';
        if (Zend_Loader::isReadable('Zend/Validate/Barcode/' . $adapter. '.php')) {
            $adapter = 'Zend_Validate_Barcode_' . $adapter;
        }

        if (!class_exists($adapter)) {
            Zend_Loader::loadClass($adapter);
        }

        $this->_adapter = new $adapter($options);
        if (!$this->_adapter instanceof Zend_Validate_Barcode_AdapterInterface) {
            require_once 'Zend/Validate/Exception.php';
            throw new Zend_Validate_Exception(
                "Adapter " . $adapter . " does not implement Zend_Validate_Barcode_AdapterInterface"
            );
        }

        return $this;
    }

    public function getChecksum()
    {
        return $this->getAdapter()->getCheck();
    }

    public function setChecksum($checksum)
    {
        $this->getAdapter()->setCheck($checksum);
        return $this;
    }

    public function isValid($value)
    {
        if (!is_string($value)) {
            $this->_error(self::INVALID);
            return false;
        }

        $this->_setValue($value);
        $adapter       = $this->getAdapter();
        $this->_length = $adapter->getLength();
        $result        = $adapter->checkLength($value);
        if (!$result) {
            $this->_error(self::INVALID_LENGTH);
            return false;
        }

        $result = $adapter->checkChars($value);
        if (!$result) {
            $this->_error(self::INVALID_CHARS);
            return false;
        }

        if ($this->getChecksum()) {
            $result = $adapter->checksum($value);
            if (!$result) {
                $this->_error(self::FAILED);
                return false;
            }
        }

        return true;
    }
}