commit vendor

vendor/laminas/laminas-validator/src/Barcode/Issn.php

@@ -0,0 +1,89 @@
+<?php
+
+/**
+ * @see       https://github.com/laminas/laminas-validator for the canonical source repository
+ * @copyright https://github.com/laminas/laminas-validator/blob/master/COPYRIGHT.md
+ * @license   https://github.com/laminas/laminas-validator/blob/master/LICENSE.md New BSD License
+ */
+
+namespace Laminas\Validator\Barcode;
+
+class Issn extends AbstractAdapter
+{
+    /**
+     * Constructor for this barcode adapter
+     */
+    public function __construct()
+    {
+        $this->setLength([8, 13]);
+        $this->setCharacters('0123456789X');
+        $this->setChecksum('gtin');
+    }
+
+    /**
+     * Allows X on length of 8 chars
+     *
+     * @param  string $value The barcode to check for allowed characters
+     * @return bool
+     */
+    public function hasValidCharacters($value)
+    {
+        if (strlen($value) != 8) {
+            if (strpos($value, 'X') !== false) {
+                return false;
+            }
+        }
+
+        return parent::hasValidCharacters($value);
+    }
+
+    /**
+     * Validates the checksum
+     *
+     * @param  string $value The barcode to check the checksum for
+     * @return bool
+     */
+    public function hasValidChecksum($value)
+    {
+        if (strlen($value) == 8) {
+            $this->setChecksum('issn');
+        } else {
+            $this->setChecksum('gtin');
+        }
+
+        return parent::hasValidChecksum($value);
+    }
+
+    /**
+     * Validates the checksum ()
+     * ISSN implementation (reversed mod11)
+     *
+     * @param  string $value The barcode to validate
+     * @return bool
+     */
+    protected function issn($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  = $check === 0 ? 0 : 11 - $check;
+        if ($check == $checksum) {
+            return true;
+        } elseif (($check == 10) && ($checksum == 'X')) {
+            return true;
+        }
+
+        return false;
+    }
+}