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

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<?php
require_once 'Zend/Validate/Barcode/AdapterInterface.php';

abstract class Zend_Validate_Barcode_AdapterAbstract
    implements Zend_Validate_Barcode_AdapterInterface
{
    protected $_length;

    protected $_characters;

    protected $_checksum;

    protected $_hasChecksum = true;

    public function checkLength($value)
    {
        if (!is_string($value)) {
            return false;
        }

        $fixum  = strlen($value);
        $found  = false;
        $length = $this->getLength();
        if (is_array($length)) {
            foreach ($length as $value) {
                if ($fixum == $value) {
                    $found = true;
                }

                if ($value == -1) {
                    $found = true;
                }
            }
        } elseif ($fixum == $length) {
            $found = true;
        } elseif ($length == -1) {
            $found = true;
        } elseif ($length == 'even') {
            $count = $fixum % 2;
            $found = ($count == 0) ? true : false;
        } elseif ($length == 'odd') {
            $count = $fixum % 2;
            $found = ($count == 1) ? true : false;
        }

        return $found;
    }

    public function checkChars($value)
    {
        if (!is_string($value)) {
            return false;
        }

        $characters = $this->getCharacters();
        if ($characters == 128) {
            for ($x = 0; $x < 128; ++$x) {
                $value = str_replace(chr($x), '', $value);
            }
        } else {
            $chars = str_split($characters);
            foreach ($chars as $char) {
                $value = str_replace($char, '', $value);
            }
        }

        if (strlen($value) > 0) {
            return false;
        }

        return true;
    }

    public function checksum($value)
    {
        $checksum = $this->getChecksum();
        if (!empty($checksum)) {
            if (method_exists($this, $checksum)) {
                return call_user_func(array($this, $checksum), $value);
            }
        }

        return false;
    }

    public function getLength()
    {
        return $this->_length;
    }

    public function getCharacters()
    {
        return $this->_characters;
    }

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

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

    public function setCheck($check)
    {
        $this->_hasChecksum = (boolean) $check;
        return $this;
    }

    protected function _gtin($value)
    {
        $barcode = substr($value, 0, -1);
        $sum     = 0;
        $length  = strlen($barcode) - 1;

        for ($i = 0; $i <= $length; $i++) {
            if (($i % 2) === 0) {
                $sum += $barcode[$length - $i] * 3;
            } else {
                $sum += $barcode[$length - $i];
            }
        }

        $calc     = $sum % 10;
        $checksum = ($calc === 0) ? 0 : (10 - $calc);
        if ($value[$length + 1] != $checksum) {
            return false;
        }

        return true;
    }

    protected function _identcode($value)
    {
        $barcode = substr($value, 0, -1);
        $sum     = 0;
        $length  = strlen($value) - 2;

        for ($i = 0; $i <= $length; $i++) {
            if (($i % 2) === 0) {
                $sum += $barcode[$length - $i] * 4;
            } else {
                $sum += $barcode[$length - $i] * 9;
            }
        }

        $calc     = $sum % 10;
        $checksum = ($calc === 0) ? 0 : (10 - $calc);
        if ($value[$length + 1] != $checksum) {
            return false;
        }

        return true;
    }

    protected function _code25($value)
    {
        $barcode = substr($value, 0, -1);
        $sum     = 0;
        $length  = strlen($barcode) - 1;

        for ($i = 0; $i <= $length; $i++) {
            if (($i % 2) === 0) {
                $sum += $barcode[$i] * 3;
            } else {
                $sum += $barcode[$i];
            }
        }

        $calc     = $sum % 10;
        $checksum = ($calc === 0) ? 0 : (10 - $calc);
        if ($value[$length + 1] != $checksum) {
            return false;
        }

        return true;
    }

    protected function _postnet($value)
    {
        $checksum = substr($value, -1, 1);
        $values   = str_split(substr($value, 0, -1));

        $check = 0;
        foreach($values as $row) {
            $check += $row;
        }

        $check %= 10;
        $check = 10 - $check;
        if ($check == $checksum) {
            return true;
        }

        return false;
    }
}