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diff --git a/hwpfilter/source/hiodev.h b/hwpfilter/source/hiodev.h
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+/**
+ * hwpio.h
+ * (C) 1999 Mizi Research, All rights are reserved
+ */
+
+#ifndef INCLUDED_HWPFILTER_SOURCE_HIODEV_H
+#define INCLUDED_HWPFILTER_SOURCE_HIODEV_H
+
+#include <sal/config.h>
+
+#include <stdio.h>
+
+#include <memory>
+#include <sal/types.h>
+
+#include "hwplib.h"
+/**
+ * @short Abstract IO class
+ */
+class DLLEXPORT HIODev
+{
+    protected:
+        bool compressed;
+        virtual void init();
+    public:
+        HIODev();
+        virtual ~HIODev();
+
+        virtual bool open() = 0;
+        virtual void flush() = 0;
+        virtual bool state() const = 0;
+/* gzip routine wrapper */
+        virtual bool setCompressed( bool ) = 0;
+
+        virtual bool read1b(unsigned char &out) = 0;
+        virtual bool read1b(char &out) = 0;
+        virtual bool read2b(unsigned short &out) = 0;
+        virtual bool read4b(unsigned int &out) = 0;
+        virtual bool read4b(int &out) = 0;
+        virtual size_t readBlock( void *ptr, size_t size ) = 0;
+        virtual size_t skipBlock( size_t size ) = 0;
+
+        size_t read2b( void *ptr, size_t nmemb );
+        size_t read4b( void *ptr, size_t nmemb );
+};
+
+struct gz_stream;
+
+/* File input and output devices */
+
+/**
+ * This controls the HStream given by constructor
+ * @short Stream IO device
+ */
+class HStreamIODev final: public HIODev
+{
+    private:
+/* zlib으로 압축을 풀기 위한 자료 구조 */
+        std::unique_ptr<HStream> _stream;
+        gz_stream *_gzfp;
+    public:
+        explicit HStreamIODev(std::unique_ptr<HStream> stream);
+        virtual ~HStreamIODev() override;
+/**
+ * Check whether the stream is available
+ */
+        virtual bool open() override;
+/**
+ * If the stream is gzipped, flush the stream.
+ */
+        virtual void flush() override;
+/**
+ * Not implemented.
+ */
+        virtual bool state() const override;
+/**
+ * Set whether the stream is compressed or not
+ */
+        virtual bool setCompressed( bool ) override;
+/**
+ * Read one byte from stream
+ */
+        virtual bool read1b(unsigned char &out) override;
+        virtual bool read1b(char &out) override;
+/**
+ * Read 2 bytes from stream
+ */
+        using HIODev::read2b;
+        virtual bool read2b(unsigned short &out) override;
+/**
+ * Read 4 bytes from stream
+ */
+        using HIODev::read4b;
+        virtual bool read4b(unsigned int &out) override;
+        virtual bool read4b(int &out) override;
+/**
+ * Read some bytes from stream to given pointer as amount of size
+ */
+        virtual size_t readBlock( void *ptr, size_t size ) override;
+/**
+ * Move current pointer of stream as amount of size
+ */
+        virtual size_t skipBlock( size_t size ) override;
+    private:
+/**
+ * Initialize this object
+ */
+        virtual void init() override;
+};
+
+/* Memory, input and output devices */
+/**
+ * The HMemIODev class controls the Input/Output device.
+ * @short Memory IO device
+ */
+class HMemIODev final: public HIODev
+{
+    uchar *ptr;
+    size_t pos, length;
+    public:
+        HMemIODev(char *s, size_t len);
+        virtual ~HMemIODev() override;
+
+        virtual bool open() override;
+        virtual void flush() override;
+        virtual bool state() const override;
+/* gzip routine wrapper */
+        virtual bool setCompressed( bool ) override;
+        virtual bool read1b(unsigned char &out) override;
+        virtual bool read1b(char &out) override;
+        using HIODev::read2b;
+        virtual bool read2b(unsigned short &out) override;
+        using HIODev::read4b;
+        virtual bool read4b(unsigned int &out) override;
+        virtual bool read4b(int &out) override;
+        virtual size_t readBlock( void *ptr, size_t size ) override;
+        virtual size_t skipBlock( size_t size ) override;
+    private:
+        virtual void init() override;
+};
+#endif // INCLUDED_HWPFILTER_SOURCE_HIODEV_H
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */