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diff --git a/hwpfilter/source/hgzip.h b/hwpfilter/source/hgzip.h
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+/* $Id: hgzip.h,v 1.5 2008-06-04 09:57:59 vg Exp $ */
+
+#ifndef _HWPGZIP_H_
+#define _HWPGZIP_H_
+
+// DVO: add zlib/ prefix
+#ifdef SYSTEM_ZLIB
+#include <zlib.h>
+#else
+#include "zlib/zlib.h"
+#endif
+
+class HStream;
+/**
+ * @short Structure for using z_stream
+ */
+struct gz_stream
+{
+    z_stream stream;
+/**
+ * The error code of z_stream operation
+ */
+    int      z_err;
+/**
+ * EOF of the input file
+ */
+    int      z_eof;
+/**
+ * Stream
+ */
+    HStream*     _inputstream;
+/**
+ * Input buffer
+ */
+    Byte     *inbuf;
+/**
+ * Output buffer
+ */
+    Byte     *outbuf;
+/**
+ * Crc32 of uncompressed data
+ */
+    uLong    crc;
+/**
+ * Stream
+ */
+    char     *msg;
+/**
+ * It becomes one when the input file type is not gz file
+ */
+    int      transparent;
+/**
+ * 'w' or 'r'
+ */
+    char     mode;
+};
+
+/**
+ *  Opens a gzipped stream for reading.
+ *    gz_open returns NULL if the stream could not be opened or if there was
+ *  insufficient memory to allocate the (de)compression state; errno
+ *  can be checked to distinguish the two cases (if errno is zero, the
+ *  zlib error is Z_MEM_ERROR).
+ * @param _stream Reference of stream object having binary data.
+ */
+gz_stream   *gz_open    ( HStream& _stream );
+/**
+ * Flushes all pending output if necessary, closes the compressed stream
+ * and deallocates all the (de)compression state
+ */
+int     gz_close    ( gz_stream *file );
+/**
+ * Reads the given number of uncompressed bytes from the compressed stream
+ * @param file Gzipped stream
+ * @param buf Buffer to have the data to be read
+ * @param len Length of data to be read
+ * @returns The number of bytes actually read
+ */
+int     gz_read     ( gz_stream *file, voidp  buf, unsigned len );
+/**
+ * Flushes all pending output into the compressed file
+ * gz_flush should be called only when strictly necessary because it can
+ * degrade compression
+ * @param flush Is as in the deflate() function
+ */
+int     gz_flush    ( gz_stream *file, int flush );
+#endif                                            /* _HWPGZIP_H_ */
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */