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diff --git a/sdext/source/pdfimport/inc/pdfparse.hxx b/sdext/source/pdfimport/inc/pdfparse.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_INC_PDFPARSE_HXX
+#define INCLUDED_SDEXT_SOURCE_PDFIMPORT_INC_PDFPARSE_HXX
+
+#include <sal/types.h>
+#include <rtl/ustring.hxx>
+#include <rtl/string.hxx>
+
+#include <string_view>
+#include <unordered_map>
+#include <vector>
+#include <memory>
+
+namespace pdfparse
+{
+
+struct EmitImplData;
+struct PDFContainer;
+class EmitContext
+{
+public:
+    virtual bool write( const void* pBuf, unsigned int nLen ) = 0;
+    virtual unsigned int getCurPos() = 0;
+    virtual bool copyOrigBytes( unsigned int nOrigOffset, unsigned int nLen ) = 0;
+    virtual unsigned int readOrigBytes( unsigned int nOrigOffset, unsigned int nLen, void* pBuf ) = 0;
+
+    explicit EmitContext( const PDFContainer* pTop = nullptr );
+    virtual ~EmitContext();
+
+    // set this to deflate contained streams
+    bool m_bDeflate;
+    // set this to decrypt the PDF file
+    bool m_bDecrypt;
+
+private:
+    friend struct PDFEntry;
+    std::unique_ptr<EmitImplData> m_pImplData;
+};
+
+struct PDFEntry
+{
+    PDFEntry() {}
+    virtual ~PDFEntry();
+
+    virtual bool emit( EmitContext& rWriteContext ) const = 0;
+    virtual PDFEntry* clone() const = 0;
+
+protected:
+    static EmitImplData* getEmitData( EmitContext const & rContext );
+    static void setEmitData( EmitContext& rContext, EmitImplData* pNewEmitData );
+};
+
+struct PDFComment final : public PDFEntry
+{
+    OString  m_aComment;
+
+    explicit PDFComment( const OString& rComment )
+    : PDFEntry(), m_aComment( rComment ) {}
+    virtual ~PDFComment() override;
+    virtual bool emit( EmitContext& rWriteContext ) const override;
+    virtual PDFEntry* clone() const override;
+};
+
+struct PDFValue : public PDFEntry
+{
+    // abstract base class for simple values
+    PDFValue() : PDFEntry() {}
+    virtual ~PDFValue() override;
+};
+
+struct PDFName final : public PDFValue
+{
+    OString  m_aName;
+
+    explicit PDFName( const OString& rName )
+    : PDFValue(), m_aName( rName ) {}
+    virtual ~PDFName() override;
+    virtual bool emit( EmitContext& rWriteContext ) const override;
+    virtual PDFEntry* clone() const override;
+
+    OUString getFilteredName() const;
+};
+
+struct PDFString final : public PDFValue
+{
+    OString  m_aString;
+
+    explicit PDFString( const OString& rString )
+    : PDFValue(), m_aString( rString ) {}
+    virtual ~PDFString() override;
+    virtual bool emit( EmitContext& rWriteContext ) const override;
+    virtual PDFEntry* clone() const override;
+
+    OString getFilteredString() const;
+};
+
+struct PDFNumber final : public PDFValue
+{
+    double m_fValue;
+
+    explicit PDFNumber( double fVal )
+    : PDFValue(), m_fValue( fVal ) {}
+    virtual ~PDFNumber() override;
+    virtual bool emit( EmitContext& rWriteContext ) const override;
+    virtual PDFEntry* clone() const override;
+};
+
+struct PDFBool final : public PDFValue
+{
+    bool m_bValue;
+
+    explicit PDFBool( bool bVal )
+    : PDFValue(), m_bValue( bVal ) {}
+    virtual ~PDFBool() override;
+    virtual bool emit( EmitContext& rWriteContext ) const override;
+    virtual PDFEntry* clone() const override;
+};
+
+struct PDFObjectRef final : public PDFValue
+{
+    unsigned int    m_nNumber;
+    unsigned int    m_nGeneration;
+
+    PDFObjectRef( unsigned int nNr, unsigned int nGen )
+    : PDFValue(), m_nNumber( nNr ), m_nGeneration( nGen ) {}
+    virtual ~PDFObjectRef() override;
+    virtual bool emit( EmitContext& rWriteContext ) const override;
+    virtual PDFEntry* clone() const override;
+};
+
+struct PDFNull final : public PDFValue
+{
+    PDFNull() {}
+    virtual ~PDFNull() override;
+    virtual bool emit( EmitContext& rWriteContext ) const override;
+    virtual PDFEntry* clone() const override;
+};
+
+struct PDFObject;
+struct PDFContainer : public PDFEntry
+{
+    sal_Int32              m_nOffset;
+    std::vector<std::unique_ptr<PDFEntry>> m_aSubElements;
+
+    // this is an abstract base class for identifying
+    // entries that can contain sub elements besides comments
+    PDFContainer() : PDFEntry(), m_nOffset( 0 ) {}
+    virtual ~PDFContainer() override;
+    bool emitSubElements( EmitContext& rWriteContext ) const;
+    void cloneSubElements( std::vector<std::unique_ptr<PDFEntry>>& rNewSubElements ) const;
+
+    PDFObject* findObject( unsigned int nNumber, unsigned int nGeneration ) const;
+    PDFObject* findObject( PDFObjectRef const * pRef ) const
+    { return findObject( pRef->m_nNumber, pRef->m_nGeneration ); }
+};
+
+struct PDFArray final : public PDFContainer
+{
+    PDFArray() {}
+    virtual ~PDFArray() override;
+    virtual bool emit( EmitContext& rWriteContext ) const override;
+    virtual PDFEntry* clone() const override;
+};
+
+struct PDFDict final : public PDFContainer
+{
+    typedef std::unordered_map<OString,PDFEntry*> Map;
+    Map m_aMap;
+
+    PDFDict() {}
+    virtual ~PDFDict() override;
+    virtual bool emit( EmitContext& rWriteContext ) const override;
+    virtual PDFEntry* clone() const override;
+
+    // inserting a value of NULL will remove rName and the previous value
+    // from the dictionary
+    void insertValue( const OString& rName, std::unique_ptr<PDFEntry> pValue );
+    // removes a name/value pair from the dict
+    void eraseValue( std::string_view rName );
+    // builds new map as of sub elements
+    // returns NULL if successful, else the first offending element
+    PDFEntry* buildMap();
+};
+
+struct PDFStream final : public PDFEntry
+{
+    unsigned int    m_nBeginOffset;
+    unsigned int    m_nEndOffset; // offset of the byte after the stream
+    PDFDict*        m_pDict;
+
+    PDFStream( unsigned int nBegin, unsigned int nEnd, PDFDict* pStreamDict )
+    : PDFEntry(), m_nBeginOffset( nBegin ), m_nEndOffset( nEnd ), m_pDict( pStreamDict ) {}
+    virtual ~PDFStream() override;
+    virtual bool emit( EmitContext& rWriteContext ) const override;
+    virtual PDFEntry* clone() const override;
+
+    unsigned int getDictLength( const PDFContainer* pObjectContainer ) const; // get contents of the "Length" entry of the dict
+};
+
+struct PDFTrailer final : public PDFContainer
+{
+    PDFDict*        m_pDict;
+
+    PDFTrailer() : PDFContainer(), m_pDict( nullptr ) {}
+    virtual ~PDFTrailer() override;
+    virtual bool emit( EmitContext& rWriteContext ) const override;
+    virtual PDFEntry* clone() const override;
+};
+
+struct PDFFileImplData;
+struct PDFFile final : public PDFContainer
+{
+private:
+    mutable std::unique_ptr<PDFFileImplData> m_pData;
+    PDFFileImplData*            impl_getData() const;
+public:
+    unsigned int        m_nMajor;           // PDF major
+    unsigned int        m_nMinor;           // PDF minor
+
+    PDFFile();
+    virtual ~PDFFile() override;
+
+    virtual bool emit( EmitContext& rWriteContext ) const override;
+    virtual PDFEntry* clone() const override;
+
+    bool isEncrypted() const;
+
+    bool usesSupportedEncryptionFormat() const;
+
+    // this method checks whether rPwd is compatible with
+    // either user or owner password and sets up decrypt data in that case
+    // returns true if decryption can be done
+    bool setupDecryptionData( const OString& rPwd ) const;
+
+    bool decrypt( const sal_uInt8* pInBuffer, sal_uInt32 nLen,
+                  sal_uInt8* pOutBuffer,
+                  unsigned int nObject, unsigned int nGeneration ) const;
+};
+
+struct PDFObject final : public PDFContainer
+{
+    PDFEntry*       m_pObject;
+    PDFStream*      m_pStream;
+    unsigned int    m_nNumber;
+    unsigned int    m_nGeneration;
+
+    PDFObject( unsigned int nNr, unsigned int nGen )
+    : m_pObject( nullptr ), m_pStream( nullptr ), m_nNumber( nNr ), m_nGeneration( nGen ) {}
+    virtual ~PDFObject() override;
+    virtual bool emit( EmitContext& rWriteContext ) const override;
+    virtual PDFEntry* clone() const override;
+
+    // writes only the contained stream, deflated if necessary
+    void writeStream( EmitContext& rContext, const PDFFile* pPDFFile ) const;
+
+private:
+    // returns true if stream is deflated
+    // fills *ppStream and *pBytes with start of stream and count of bytes
+    // memory returned in *ppStream must be freed with std::free afterwards
+    // fills in NULL and 0 in case of error
+    bool getDeflatedStream( std::unique_ptr<char[]>& rpStream, unsigned int* pBytes, const PDFContainer* pObjectContainer, EmitContext& rContext ) const;
+};
+
+struct PDFPart final : public PDFContainer
+{
+    PDFPart() : PDFContainer() {}
+    virtual ~PDFPart() override;
+    virtual bool emit( EmitContext& rWriteContext ) const override;
+    virtual PDFEntry* clone() const override;
+};
+
+struct PDFReader
+{
+    PDFReader() = delete;
+
+    static std::unique_ptr<PDFEntry> read( const char* pFileName );
+#ifdef _WIN32
+    static std::unique_ptr<PDFEntry> read( const char* pBuffer, unsigned int nLen );
+#endif
+};
+
+} // namespace
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */