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Zend/Validate/Barcode/Ean13.php

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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) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ * @version    $Id: Ean13.php 8210 2008-02-20 14:09:05Z andries $
+ */
+
+
+/**
+ * @see Zend_Validate_Abstract
+ */
+require_once 'Zend/Validate/Abstract.php';
+
+
+/**
+ * @category   Zend
+ * @package    Zend_Validate
+ * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+class Zend_Validate_Barcode_Ean13 extends Zend_Validate_Abstract
+{
+    /**
+     * Validation failure message key for when the value is
+     * an invalid barcode
+     */
+    const INVALID = 'invalid';
+
+    /**
+     * Validation failure message key for when the value is
+     * not 13 characters long
+     */
+    const INVALID_LENGTH = 'invalidLength';
+
+    /**
+     * Validation failure message template definitions
+     *
+     * @var array
+     */
+    protected $_messageTemplates = array(
+        self::INVALID        => "'%value%' is an invalid EAN-13 barcode",
+        self::INVALID_LENGTH => "'%value%' should be 13 characters",
+    );
+
+    /**
+     * Defined by Zend_Validate_Interface
+     *
+     * Returns true if and only if $value contains a valid barcode
+     *
+     * @param  string $value
+     * @return boolean
+     */
+    public function isValid($value)
+    {
+        $valueString = (string) $value;
+        $this->_setValue($valueString);
+
+        if (strlen($valueString) !== 13) {
+            $this->_error(self::INVALID_LENGTH);
+            return false;
+        }
+
+        $barcode = strrev(substr($valueString, 0, -1));
+        $oddSum  = 0;
+        $evenSum = 0;
+
+        for ($i = 0; $i < 12; $i++) {
+            if ($i % 2 === 0) {
+                $oddSum += $barcode[$i] * 3;
+            } elseif ($i % 2 === 1) {
+                $evenSum += $barcode[$i];
+            }
+        }
+
+        $calculation = ($oddSum + $evenSum) % 10;
+        $checksum    = ($calculation === 0) ? 0 : 10 - $calculation;
+
+        if ($valueString[12] != $checksum) {
+            $this->_error(self::INVALID);
+            return false;
+        }
+
+        return true;
+    }
+}