.dcx file format: PHP parsing library

<?php
// This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild

/**
 * DCX is a simple extension of PCX image format allowing to bundle
 * many PCX images (typically, pages of a document) in one file. It saw
 * some limited use in DOS-era fax software, but was largely
 * superseded with multi-page TIFFs and PDFs since then.
 */

namespace {
    class PcxDcx extends \Kaitai\Struct\Struct {
        public function __construct(\Kaitai\Struct\Stream $_io, \Kaitai\Struct\Struct $_parent = null, \PcxDcx $_root = null) {
            parent::__construct($_io, $_parent, $_root);
            $this->_read();
        }

        private function _read() {
            $this->_m_magic = $this->_io->readBytes(4);
            if (!($this->magic() == "\xB1\x68\xDE\x3A")) {
                throw new \Kaitai\Struct\Error\ValidationNotEqualError("\xB1\x68\xDE\x3A", $this->magic(), $this->_io(), "/seq/0");
            }
            $this->_m_files = [];
            $i = 0;
            do {
                $_ = new \PcxDcx\PcxOffset($this->_io, $this, $this->_root);
                $this->_m_files[] = $_;
                $i++;
            } while (!($_->ofsBody() == 0));
        }
        protected $_m_magic;
        protected $_m_files;
        public function magic() { return $this->_m_magic; }
        public function files() { return $this->_m_files; }
    }
}

namespace PcxDcx {
    class PcxOffset extends \Kaitai\Struct\Struct {
        public function __construct(\Kaitai\Struct\Stream $_io, \PcxDcx $_parent = null, \PcxDcx $_root = null) {
            parent::__construct($_io, $_parent, $_root);
            $this->_read();
        }

        private function _read() {
            $this->_m_ofsBody = $this->_io->readU4le();
        }
        protected $_m_body;
        public function body() {
            if ($this->_m_body !== null)
                return $this->_m_body;
            if ($this->ofsBody() != 0) {
                $_pos = $this->_io->pos();
                $this->_io->seek($this->ofsBody());
                $this->_m_body = new \Pcx($this->_io);
                $this->_io->seek($_pos);
            }
            return $this->_m_body;
        }
        protected $_m_ofsBody;
        public function ofsBody() { return $this->_m_ofsBody; }
    }
}