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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 -*- */
+/*
+ * 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 .
+ */
+
+#ifndef INCLUDED_SDEXT_SOURCE_PDFIMPORT_XPDFWRAPPER_PNGHELPER_HXX
+#define INCLUDED_SDEXT_SOURCE_PDFIMPORT_XPDFWRAPPER_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 const &    zeroColor,
+                               GfxRGB const &    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: */