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diff --git a/xmlhelp/source/cxxhelp/provider/db.hxx b/xmlhelp/source/cxxhelp/provider/db.hxx
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+++ b/xmlhelp/source/cxxhelp/provider/db.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_XMLHELP_SOURCE_CXXHELP_PROVIDER_DB_HXX
+#define INCLUDED_XMLHELP_SOURCE_CXXHELP_PROVIDER_DB_HXX
+
+#include <com/sun/star/ucb/XSimpleFileAccess3.hpp>
+#include <comphelper/fileurl.hxx>
+#include <osl/diagnose.h>
+#include <rtl/string.hxx>
+#include <memory>
+#include <unordered_map>
+
+namespace helpdatafileproxy {
+
+    class HDFData
+    {
+        friend class        Hdf;
+
+        int                     m_nSize;
+        std::unique_ptr<char[]> m_pBuffer;
+
+        void copyToBuffer( const char* pSrcData, int nSize );
+
+    public:
+        HDFData() : m_nSize( 0 ) {}
+
+        int getSize() const
+            { return m_nSize; }
+        const char* getData() const
+            { return m_pBuffer.get(); }
+    };
+
+    typedef std::unordered_map< OString,std::pair<int,int> >   StringToValPosMap;
+    typedef std::unordered_map< OString,OString >     StringToDataMap;
+
+    class Hdf
+    {
+        OUString       m_aFileURL;
+        std::unique_ptr<StringToDataMap>   m_pStringToDataMap;
+        std::unique_ptr<StringToValPosMap> m_pStringToValPosMap;
+        css::uno::Reference< css::ucb::XSimpleFileAccess3 >
+                            m_xSFA;
+
+        css::uno::Sequence< sal_Int8 >
+                            m_aItData;
+        const char*         m_pItData;
+        int                 m_nItRead;
+        int                 m_iItPos;
+
+        static bool implReadLenAndData( const char* pData, int& riPos, HDFData& rValue );
+
+    public:
+        //HDFHelp must get a fileURL which can then directly be used by simple file access.
+        //SimpleFileAccess requires file URLs as arguments. Passing file path may work but fails
+        //for example when using long file paths on Windows, which start with "\\?\"
+        Hdf( const OUString& rFileURL,
+            css::uno::Reference< css::ucb::XSimpleFileAccess3 > const & xSFA )
+                : m_aFileURL( rFileURL )
+                , m_xSFA( xSFA )
+                , m_pItData( nullptr )
+                , m_nItRead( -1 )
+                , m_iItPos( -1 )
+        {
+            OSL_ASSERT(comphelper::isFileUrl(rFileURL));
+        }
+        ~Hdf();
+
+        void createHashMap( bool bOptimizeForPerformance );
+        void releaseHashMap();
+
+        bool getValueForKey( const OString& rKey, HDFData& rValue );
+
+        bool startIteration();
+        bool getNextKeyAndValue( HDFData& rKey, HDFData& rValue );
+        void stopIteration();
+        Hdf(const Hdf&) = delete;
+        void operator=(const Hdf&) = delete;
+    };
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */