FilterASCIIHexDecode.php

<?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
 */

/**
* PLEASE NOTE THAT THIS FILE IS PROCESSED PROGRAMMATICALLY FOR THE itbz\fpdi
* RELEASE BUG REPORTS AND SUGGESTED CHANGES SHOULD BE DIRECTED TO SETASIGN
* DIRECTLY BUGS RELATED TO THIS CONVERSION CAN BE REPORTED AT
* https://github.com/hanneskod/fpdi/issues
*/

namespace fpdi {
    class FilterASCIIHexDecode
    {
        public function decode($data)
        {
            $data = preg_replace('/[^0-9A-Fa-f]/', '', rtrim($data, '>'));
            if (strlen($data) % 2 == 1) {
                $data .= '0';
            }
            return pack('H*', $data);
        }
        public function encode($data, $leaveEOD = false)
        {
            return current(unpack('H*', $data)) . ($leaveEOD ? '' : '>');
        }
    }
}