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prints3/filters/FilterASCIIHexDecode.php

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+<?php
+/**
+ * This file is part of FPDI
+ *
+ * @package   FPDI
+ * @copyright Copyright (c) 2015 Setasign - Jan Slabon (http://www.setasign.com)
+ * @license   http://opensource.org/licenses/mit-license The MIT License
+ * @version   1.6.1
+ */
+
+/**
+ * Class FilterASCIIHexDecode
+ */
+class FilterASCIIHexDecode
+{
+    /**
+     * Converts an ASCII hexadecimal encoded string into it's binary representation.
+     *
+     * @param string $data The input string
+     * @return string
+     */
+    public function decode($data)
+    {
+        $data = preg_replace('/[^0-9A-Fa-f]/', '', rtrim($data, '>'));
+        if ((strlen($data) % 2) == 1) {
+            $data .= '0';
+        }
+
+        return pack('H*', $data);
+    }
+
+    /**
+     * Converts a string into ASCII hexadecimal representation.
+     *
+     * @param string $data The input string
+     * @param boolean $leaveEOD
+     * @return string
+     */
+    public function encode($data, $leaveEOD = false)
+    {
+        return current(unpack('H*', $data)) . ($leaveEOD ? '' : '>');
+    }
+}