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diff --git a/sdext/source/pdfimport/xpdfwrapper/pnghelper.hxx b/sdext/source/pdfimport/xpdfwrapper/pnghelper.hxx
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+++ b/sdext/source/pdfimport/xpdfwrapper/pnghelper.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ *  OpenOffice.org - a multi-platform office productivity suite
+ *
+ *  The Contents of this file are made available subject to
+ *  the terms of GNU General Public License Version 2.
+ *
+ *
+ *    GNU General Public License, version 2
+ *    =============================================
+ *    Copyright 2005 by Sun Microsystems, Inc.
+ *    901 San Antonio Road, Palo Alto, CA 94303, USA
+ *
+ *    This program is free software; you can redistribute it and/or
+ *    modify it under the terms of the GNU General Public License as
+ *    published by the Free Software Foundation; either version 2 of
+ *    the License, or (at your option) any later version.
+ *
+ *    This program 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 General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public
+ *    License along with this program; if not, write to the Free
+ *    Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *    Boston, MA 02110-1301, USA.
+ *
+ ************************************************************************/
+#ifndef _IPDF_PNGHELPER_HXX
+#define _IPDF_PNGHELPER_HXX
+
+#include "sal/types.h"
+#include "pdfioutdev_gpl.hxx"
+
+
+namespace pdfi
+{
+    class PngHelper
+    {
+        static sal_uInt32 crc_table[ 256 ];
+        static bool bCRCTableInit;
+
+        static void initCRCTable();
+        static void appendFileHeader( OutputBuffer& o_rOutputBuf );
+        static size_t startChunk( const char* pChunkName, OutputBuffer& o_rOut );
+        static void endChunk( size_t nStart, OutputBuffer& o_rOut );
+
+        static void set( sal_uInt32 i_nValue, OutputBuffer& o_rOutputBuf, size_t i_nIndex );
+        static void append( sal_uInt32 i_nValue, OutputBuffer& o_rOutputBuf )
+        {
+            size_t nCur = o_rOutputBuf.size();
+            o_rOutputBuf.insert( o_rOutputBuf.end(), 4, (Output_t)0 );
+            set( i_nValue, o_rOutputBuf, nCur );
+        }
+
+        static void appendIHDR( OutputBuffer& o_rOutputBuf, int width, int height, int depth, int colortype );
+        static void appendIEND( OutputBuffer& o_rOutputBuf );
+
+    public:
+        static void updateCRC( sal_uInt32& io_rCRC, const sal_uInt8* i_pBuf, size_t i_nLen );
+        static sal_uInt32 getCRC( const sal_uInt8* i_pBuf, size_t i_nLen );
+
+        // deflates the passed buff i_pBuf and appends it to the output vector
+        // returns the number of bytes added to the output
+        static sal_uInt32 deflateBuffer( const Output_t* i_pBuf, size_t i_nLen, OutputBuffer& o_rOut );
+
+        static void createPng( OutputBuffer&     o_rOutputBuf,
+                               Stream*           str,
+                               int               width,
+                               int               height,
+                               GfxRGB&           zeroColor,
+                               GfxRGB&           oneColor,
+                               bool              bIsMask
+                               );
+        static void createPng( OutputBuffer& o_rOutputBuf,
+                               Stream* str,
+                               int width, int height, GfxImageColorMap* colorMap,
+                               Stream* maskStr,
+                               int maskWidth, int maskHeight, GfxImageColorMap* maskColorMap );
+
+        // for one bit masks
+        static void createPng( OutputBuffer& o_rOutputBuf,
+                               Stream* str,
+                               int width, int height, GfxImageColorMap* colorMap,
+                               Stream* maskStr,
+                               int maskWidth, int maskHeight, bool maskInvert );
+
+    };
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */