Adding upstream version 4:24.2.0.upstream/4%24.2.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

18 files changed, 3065 insertions, 0 deletions

diff --git a/include/oox/helper/addtosequence.hxx b/include/oox/helper/addtosequence.hxx
new file mode 100644
index 0000000000..dbb271ca09
--- /dev/null
+++ b/include/oox/helper/addtosequence.hxx
@@ -0,0 +1,41 @@
+/* -*- 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_OOX_HELPER_ADDTOSEQUENCE_HXX
+#define INCLUDED_OOX_HELPER_ADDTOSEQUENCE_HXX
+
+#include <com/sun/star/uno/Any.hxx>
+#include <oox/dllapi.h>
+
+namespace oox
+{
+
+/** this adds an any to another any.
+    if rNewValue is empty, rOldValue is returned.
+    if rOldValue is empty, rNewValue is returned.
+    if rOldValue contains a value, a sequence with rOldValue and rNewValue is returned.
+    if rOldValue contains a sequence, a new sequence with the old sequence and rNewValue is returned.
+*/
+OOX_DLLPUBLIC css::uno::Any addToSequence( const css::uno::Any& rOldValue, const css::uno::Any& rNewValue );
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/oox/helper/attributelist.hxx b/include/oox/helper/attributelist.hxx
new file mode 100644
index 0000000000..25f2ebe4f8
--- /dev/null
+++ b/include/oox/helper/attributelist.hxx
@@ -0,0 +1,194 @@
+/* -*- 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_OOX_HELPER_ATTRIBUTELIST_HXX
+#define INCLUDED_OOX_HELPER_ATTRIBUTELIST_HXX
+
+#include <sal/config.h>
+
+#include <string_view>
+#include <vector>
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <com/sun/star/util/DateTime.hpp>
+#include <oox/dllapi.h>
+#include <rtl/ustring.hxx>
+#include <sal/types.h>
+#include <oox/drawingml/color.hxx>
+
+namespace com::sun::star {
+    namespace xml::sax { class XFastAttributeList; }
+}
+
+namespace sax_fastparser {
+    class FastAttributeList;
+};
+
+namespace oox {
+
+    /* Get the color tokens from their string representatives. */
+    sal_Int32 getHighlightColorTokenFromString(std::u16string_view sColorName);
+
+/** Static helpers for conversion of strings to attribute values of various
+    different data types.
+ */
+class OOX_DLLPUBLIC AttributeConversion
+{
+public:
+    /** Returns the XML token identifier from the passed string. */
+    static sal_Int32    decodeToken( std::u16string_view rValue );
+
+    /** Returns the decoded string value. All characters in the format
+        '_xHHHH_' (H being a hexadecimal digit), will be decoded. */
+    static OUString decodeXString( const OUString& rValue );
+
+    /** Returns the 32-bit signed integer value from the passed string (decimal). */
+    static sal_Int32    decodeInteger( std::u16string_view rValue );
+
+    /** Returns the 32-bit unsigned integer value from the passed string (decimal). */
+    static sal_uInt32   decodeUnsigned( std::u16string_view rValue );
+
+    /** Returns the 64-bit signed integer value from the passed string (decimal). */
+    static sal_Int64    decodeHyper( std::u16string_view rValue );
+
+    /** Returns the 32-bit signed integer value from the passed string (hexadecimal). */
+    static sal_Int32    decodeIntegerHex( std::u16string_view rValue );
+};
+
+
+/** Provides access to attribute values of an element.
+
+    Wraps a com.sun.star.xml.sax.XFastAttributeList object. Provides
+    convenience functions that convert the string value of an attribute to
+    various other data types.
+ */
+class OOX_DLLPUBLIC AttributeList
+{
+public:
+    explicit            AttributeList(
+                            const css::uno::Reference< css::xml::sax::XFastAttributeList >& rxAttribs );
+
+    /** Returns the wrapped com.sun.star.xml.sax.XFastAttributeList object. */
+    const css::uno::Reference< css::xml::sax::XFastAttributeList >&
+                        getFastAttributeList() const { return mxAttribs; }
+
+    /** Returns true, if the specified attribute is present. */
+    bool                hasAttribute( sal_Int32 nAttrToken ) const;
+
+    // optional return values -------------------------------------------------
+
+    /** Returns the token identifier of the value of the specified attribute. */
+    std::optional< sal_Int32 > getToken( sal_Int32 nAttrToken ) const;
+
+    /** Returns the Color object of highlight of the text. */
+    oox::drawingml::Color getHighlightColor(sal_Int32 nAttrToken) const;
+
+    /** Returns the string value of the specified attribute. */
+    std::optional< OUString > getString( sal_Int32 nAttrToken ) const;
+
+    /** Returns the string value of the specified attribute, returns an empty string if attribute not present. */
+    OUString getStringDefaulted( sal_Int32 nAttrToken ) const;
+
+    /** Returns the string value of the specified attribute. All characters in
+        the format '_xHHHH_' (H being a hexadecimal digit), will be decoded. */
+    std::optional< OUString > getXString( sal_Int32 nAttrToken ) const;
+
+    /** Returns the double value of the specified attribute. */
+    std::optional< double >  getDouble( sal_Int32 nAttrToken ) const;
+
+    /** Returns the 32-bit signed integer value of the specified attribute (decimal). */
+    std::optional< sal_Int32 > getInteger( sal_Int32 nAttrToken ) const;
+
+    /** Returns the 32-bit unsigned integer value of the specified attribute (decimal). */
+    std::optional< sal_uInt32 > getUnsigned( sal_Int32 nAttrToken ) const;
+
+    /** Returns the 64-bit signed integer value of the specified attribute (decimal). */
+    std::optional< sal_Int64 > getHyper( sal_Int32 nAttrToken ) const;
+
+    /** Returns the 32-bit signed integer value of the specified attribute (hexadecimal). */
+    std::optional< sal_Int32 > getIntegerHex( sal_Int32 nAttrToken ) const;
+
+    /** Returns the boolean value of the specified attribute. */
+    std::optional< bool > getBool( sal_Int32 nAttrToken ) const;
+
+    /** Returns the date/time value of the specified attribute. */
+    std::optional< css::util::DateTime > getDateTime( sal_Int32 nAttrToken ) const;
+
+    // defaulted return values ------------------------------------------------
+
+    /** Returns the token identifier of the value of the specified attribute,
+        or the passed default identifier if the attribute is missing. */
+    sal_Int32           getToken( sal_Int32 nAttrToken, sal_Int32 nDefault ) const;
+
+    /** Returns the string value of the specified attribute, or the passed
+        default string if the attribute is missing. */
+    OUString     getString( sal_Int32 nAttrToken, const OUString& rDefault ) const;
+
+    /** Returns the decoded string value of the specified attribute, or the
+        passed default string if the attribute is missing. */
+    OUString     getXString( sal_Int32 nAttrToken, const OUString& rDefault ) const;
+
+    std::string_view getView( sal_Int32 nAttrToken ) const;
+
+
+    /** Returns the double value of the specified attribute, or the passed
+        default value if the attribute is missing or not convertible to a double. */
+    double              getDouble( sal_Int32 nAttrToken, double fDefault ) const;
+
+    /** Returns the 32-bit signed integer value of the specified attribute, or the
+        passed default value if the attribute is missing or not convertible to integer. */
+    sal_Int32           getInteger( sal_Int32 nAttrToken, sal_Int32 nDefault ) const;
+
+    /** Returns the 32-bit unsigned integer value of the specified attribute, or the
+        passed default value if the attribute is missing or not convertible to unsigned. */
+    sal_uInt32          getUnsigned( sal_Int32 nAttrToken, sal_uInt32 nDefault ) const;
+
+    /** Returns the 64-bit signed integer value of the specified attribute, or the
+        passed default value if the attribute is missing or not convertible to integer. */
+    sal_Int64           getHyper( sal_Int32 nAttrToken, sal_Int64 nDefault ) const;
+
+    /** Returns the 32-bit signed integer value of the specified attribute (hexadecimal),
+        or the passed default value if the attribute is missing or not convertible. */
+    sal_Int32           getIntegerHex( sal_Int32 nAttrToken, sal_Int32 nDefault ) const;
+
+    sal_uInt32          getUnsignedHex( sal_Int32 nAttrToken, sal_uInt32 nDefault ) const;
+
+    /** Returns the boolean value of the specified attribute, or the passed
+        default value if the attribute is missing or not convertible to bool. */
+    bool                getBool( sal_Int32 nAttrToken, bool bDefault ) const;
+
+    /** Returns the date/time value of the specified attribute, or the default
+        value if the attribute is missing or not convertible to a date/time value. */
+    css::util::DateTime getDateTime( sal_Int32 nAttrToken, const css::util::DateTime& rDefault ) const;
+
+    std::vector<sal_Int32> getTokenList(sal_Int32 nAttrToken) const;
+
+private:
+    css::uno::Reference< css::xml::sax::XFastAttributeList >
+                        mxAttribs;
+    mutable sax_fastparser::FastAttributeList *mpAttribList;
+    sax_fastparser::FastAttributeList *getAttribList() const;
+};
+
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/oox/helper/binaryinputstream.hxx b/include/oox/helper/binaryinputstream.hxx
new file mode 100644
index 0000000000..e27b2def9c
--- /dev/null
+++ b/include/oox/helper/binaryinputstream.hxx
@@ -0,0 +1,385 @@
+/* -*- 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_OOX_HELPER_BINARYINPUTSTREAM_HXX
+#define INCLUDED_OOX_HELPER_BINARYINPUTSTREAM_HXX
+
+#include <cstddef>
+#include <memory>
+#include <vector>
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <oox/dllapi.h>
+#include <oox/helper/binarystreambase.hxx>
+#include <oox/helper/helper.hxx>
+#include <rtl/string.hxx>
+#include <rtl/textenc.h>
+#include <rtl/ustring.hxx>
+#include <sal/types.h>
+
+namespace com::sun::star {
+    namespace io { class XInputStream; }
+}
+
+namespace oox {
+
+class BinaryOutputStream;
+
+
+/** Interface for binary input stream classes.
+
+    The binary data in the stream is assumed to be in little-endian format.
+ */
+class OOX_DLLPUBLIC BinaryInputStream : public virtual BinaryStreamBase
+{
+public:
+    /** Derived classes implement reading nBytes bytes to the passed sequence.
+        The sequence will be reallocated internally.
+
+        @param nAtomSize
+            The size of the elements in the memory block, if available. Derived
+            classes may be interested in this information.
+
+        @return
+            Number of bytes really read.
+     */
+    virtual sal_Int32   readData( StreamDataSequence& orData, sal_Int32 nBytes, size_t nAtomSize = 1 ) = 0;
+
+    /** Derived classes implement reading nBytes bytes to the (preallocated!)
+        memory buffer opMem.
+
+        @param nAtomSize
+            The size of the elements in the memory block, if available. Derived
+            classes may be interested in this information.
+
+        @return
+            Number of bytes really read.
+     */
+    virtual sal_Int32   readMemory( void* opMem, sal_Int32 nBytes, size_t nAtomSize = 1 ) = 0;
+
+    /** Derived classes implement seeking the stream forward by the passed
+        number of bytes. This should work for non-seekable streams too.
+
+        @param nAtomSize
+            The size of the elements in the memory block, if available. Derived
+            classes may be interested in this information.
+     */
+    virtual void        skip( sal_Int32 nBytes, size_t nAtomSize = 1 ) = 0;
+
+    /** Reads a value from the stream and converts it to platform byte order.
+        All data types supported by the ByteOrderConverter class can be used.
+     */
+    template< typename Type >
+    [[nodiscard]]
+    Type                 readValue();
+
+    [[nodiscard]]
+    sal_Int8             readInt8()   { return readValue<sal_Int8>(); }
+    [[nodiscard]]
+    sal_uInt8            readuInt8()  { return readValue<sal_uInt8>(); }
+    [[nodiscard]]
+    sal_Int16            readInt16()  { return readValue<sal_Int16>(); }
+    [[nodiscard]]
+    sal_uInt16           readuInt16() { return readValue<sal_uInt16>(); }
+    [[nodiscard]]
+    sal_Int32            readInt32()  { return readValue<sal_Int32>(); }
+    [[nodiscard]]
+    sal_uInt32           readuInt32() { return readValue<sal_uInt32>(); }
+    [[nodiscard]]
+    sal_Int64            readInt64()  { return readValue<sal_Int64>(); }
+    [[nodiscard]]
+    float                readFloat()  { return readValue<float>(); }
+    [[nodiscard]]
+    double               readDouble() { return readValue<double>(); }
+    [[nodiscard]]
+    unsigned char        readuChar()  { return readValue<unsigned char>(); }
+
+    /** Reads a (preallocated!) C array of values from the stream.
+
+        Converts all values in the array to platform byte order. All data types
+        supported by the ByteOrderConverter class can be used.
+
+        @param nElemCount
+            Number of array elements to read (NOT byte count).
+
+        @return
+            Number of array elements really read (NOT byte count).
+     */
+    template< typename Type >
+    sal_Int32           readArray( Type* opnArray, sal_Int32 nElemCount );
+
+    /** Reads a vector of values from the stream.
+
+        The vector will be resized internally. Converts all values in the
+        vector to platform byte order. All data types supported by the
+        ByteOrderConverter class can be used.
+
+        @param nElemCount
+            Number of elements to put into the vector (NOT byte count).
+
+        @return
+            Number of vector elements really read (NOT byte count).
+     */
+    template< typename Type >
+    sal_Int32           readArray( ::std::vector< Type >& orVector, sal_Int32 nElemCount );
+
+    /** Reads a NUL-terminated Unicode character array and returns the string.
+     */
+    OUString     readNulUnicodeArray();
+
+    /** Reads a byte character array and returns the string.
+        NUL characters are replaced by question marks.
+
+        @param nChars
+            Number of characters (bytes) to read from the stream.
+     */
+    OString      readCharArray( sal_Int32 nChars );
+
+    /** Reads a byte character array and returns a Unicode string.
+        NUL characters are replaced by question marks.
+
+        @param nChars
+            Number of characters (bytes) to read from the stream.
+
+        @param eTextEnc
+            The text encoding used to create the Unicode string.
+     */
+    OUString     readCharArrayUC( sal_Int32 nChars, rtl_TextEncoding eTextEnc );
+
+    /** Reads a Unicode character array and returns the string.
+        NUL characters are replaced by question marks (default).
+
+        @param nChars
+            Number of 16-bit characters to read from the stream.
+     */
+    OUString     readUnicodeArray( sal_Int32 nChars );
+
+    /** Reads a Unicode character array (may be compressed) and returns the
+        string.
+        NUL characters are replaced by question marks (default).
+
+        @param nChars
+            Number of 8-bit or 16-bit characters to read from the stream.
+
+        @param bCompressed
+            True = Character array is compressed (stored as 8-bit characters).
+            False = Character array is not compressed (stored as 16-bit characters).
+     */
+    OUString     readCompressedUnicodeArray( sal_Int32 nChars, bool bCompressed );
+
+    /** Copies bytes from the current position to the passed output stream.
+     */
+    void         copyToStream( BinaryOutputStream& rOutStrm );
+
+protected:
+    /** This dummy default c'tor will never call the c'tor of the virtual base
+        class BinaryStreamBase as this class cannot be instantiated directly. */
+    BinaryInputStream() : BinaryStreamBase( false ) {}
+
+private:
+    BinaryInputStream( BinaryInputStream const& ) = delete;
+    BinaryInputStream& operator=( BinaryInputStream const& ) = delete;
+};
+
+typedef std::shared_ptr< BinaryInputStream > BinaryInputStreamRef;
+
+
+template< typename Type >
+Type BinaryInputStream::readValue()
+{
+    Type ornValue = Type();
+    readMemory( &ornValue, static_cast< sal_Int32 >( sizeof( Type ) ), sizeof( Type ) );
+    ByteOrderConverter::convertLittleEndian( ornValue );
+    return ornValue;
+}
+
+template< typename Type >
+sal_Int32 BinaryInputStream::readArray( Type* opnArray, sal_Int32 nElemCount )
+{
+    sal_Int32 nRet = 0;
+    if( !mbEof )
+    {
+        sal_Int32 nReadSize = getLimitedValue< sal_Int32, sal_Int32 >( nElemCount, 0, SAL_MAX_INT32 / sizeof( Type ) ) * sizeof( Type );
+        nRet = readMemory( opnArray, nReadSize, sizeof( Type ) ) / sizeof( Type );
+        ByteOrderConverter::convertLittleEndianArray( opnArray, static_cast< size_t >( nRet ) );
+    }
+    return nRet;
+}
+
+template< typename Type >
+sal_Int32 BinaryInputStream::readArray( ::std::vector< Type >& orVector, sal_Int32 nElemCount )
+{
+    orVector.resize( static_cast< size_t >( nElemCount ) );
+    return orVector.empty() ? 0 : readArray(orVector.data(), nElemCount);
+}
+
+
+/** Wraps a UNO input stream and provides convenient access functions.
+
+    The binary data in the stream is assumed to be in little-endian format.
+ */
+class OOX_DLLPUBLIC BinaryXInputStream final : public BinaryXSeekableStream, public BinaryInputStream
+{
+public:
+    /** Constructs the wrapper object for the passed input stream.
+
+        @param rxInStream
+            The com.sun.star.io.XInputStream interface of the UNO input stream
+            to be wrapped.
+
+        @param bAutoClose
+            True = automatically close the wrapped input stream on destruction
+            of this wrapper or when close() is called.
+     */
+    explicit            BinaryXInputStream(
+                            const css::uno::Reference< css::io::XInputStream >& rxInStrm,
+                            bool bAutoClose );
+
+    virtual             ~BinaryXInputStream() override;
+
+    /** Closes the input stream. Does also close the wrapped UNO input stream
+        if bAutoClose has been set to true in the constructor. */
+    virtual void        close() override;
+
+    /** Reads nBytes bytes to the passed sequence.
+        @return  Number of bytes really read. */
+    virtual sal_Int32   readData( StreamDataSequence& orData, sal_Int32 nBytes, size_t nAtomSize = 1 ) override;
+
+    /** Reads nBytes bytes to the (existing) buffer opMem.
+        @return  Number of bytes really read. */
+    virtual sal_Int32   readMemory( void* opMem, sal_Int32 nBytes, size_t nAtomSize = 1 ) override;
+
+    /** Seeks the stream forward by the passed number of bytes. This works for
+        non-seekable streams too. */
+    virtual void        skip( sal_Int32 nBytes, size_t nAtomSize = 1 ) override;
+
+private:
+    StreamDataSequence  maBuffer;       ///< Data buffer used in readMemory() function.
+    css::uno::Reference< css::io::XInputStream >
+                        mxInStrm;       ///< Reference to the input stream.
+    bool                mbAutoClose;    ///< True = automatically close stream on destruction.
+};
+
+
+/** Wraps a StreamDataSequence and provides convenient access functions.
+
+    The binary data in the stream is assumed to be in little-endian format.
+ */
+class OOX_DLLPUBLIC SequenceInputStream final : public SequenceSeekableStream, public BinaryInputStream
+{
+public:
+    /** Constructs the wrapper object for the passed data sequence.
+
+        @attention
+            The passed data sequence MUST live at least as long as this stream
+            wrapper. The data sequence MUST NOT be changed from outside as long
+            as this stream wrapper is used to read from it.
+     */
+    explicit            SequenceInputStream( const StreamDataSequence& rData );
+
+    /** Reads nBytes bytes to the passed sequence.
+        @return  Number of bytes really read. */
+    virtual sal_Int32   readData( StreamDataSequence& orData, sal_Int32 nBytes, size_t nAtomSize = 1 ) override;
+
+    /** Reads nBytes bytes to the (existing) buffer opMem.
+        @return  Number of bytes really read. */
+    virtual sal_Int32   readMemory( void* opMem, sal_Int32 nBytes, size_t nAtomSize = 1 ) override;
+
+    /** Seeks the stream forward by the passed number of bytes. This works for
+        non-seekable streams too. */
+    virtual void        skip( sal_Int32 nBytes, size_t nAtomSize = 1 ) override;
+
+private:
+    /** Returns the number of bytes available in the sequence for the passed byte count. */
+    sal_Int32    getMaxBytes( sal_Int32 nBytes ) const
+                            { return getLimitedValue< sal_Int32, sal_Int32 >( nBytes, 0, mpData->getLength() - mnPos ); }
+};
+
+
+/** Wraps a BinaryInputStream and provides access to a specific part of the
+    stream data.
+
+    Provides access to the stream data block starting at the current position
+    of the stream, and with a specific length. If the wrapped stream is
+    seekable, this wrapper will treat the position of the wrapped stream at
+    construction time as position "0" (therefore the class name).
+
+    The passed input stream MUST live at least as long as this stream wrapper.
+    The stream MUST NOT be changed from outside as long as this stream wrapper
+    is used to read from it.
+ */
+class RelativeInputStream final : public BinaryInputStream
+{
+public:
+    /** Constructs the wrapper object for the passed stream.
+
+        @param nSize
+            If specified, restricts the amount of data that can be read from
+            the passed input stream.
+     */
+    explicit            RelativeInputStream(
+                            BinaryInputStream& rInStrm,
+                            sal_Int64 nSize );
+
+    /** Returns the size of the data block in the wrapped stream offered by
+        this wrapper. */
+    virtual sal_Int64   size() const override;
+
+    /** Returns the current relative stream position. */
+    virtual sal_Int64   tell() const override;
+
+    /** Seeks the stream to the passed relative position, if the wrapped stream
+        is seekable. */
+    virtual void        seek( sal_Int64 nPos ) override;
+
+    /** Closes the input stream but not the wrapped stream. */
+    virtual void        close() override;
+
+    /** Reads nBytes bytes to the passed sequence. Does not read out of the
+        data block whose size has been specified on construction.
+        @return  Number of bytes really read. */
+    virtual sal_Int32   readData( StreamDataSequence& orData, sal_Int32 nBytes, size_t nAtomSize = 1 ) override;
+
+    /** Reads nBytes bytes to the (existing) buffer opMem. Does not read out of
+        the data block whose size has been specified on construction.
+        @return  Number of bytes really read. */
+    virtual sal_Int32   readMemory( void* opMem, sal_Int32 nBytes, size_t nAtomSize = 1 ) override;
+
+    /** Seeks the stream forward by the passed number of bytes. This works for
+        non-seekable streams too. Does not seek out of the data block. */
+    virtual void        skip( sal_Int32 nBytes, size_t nAtomSize = 1 ) override;
+
+private:
+    /** Returns the number of bytes available in the sequence for the passed byte count. */
+    sal_Int32    getMaxBytes( sal_Int32 nBytes ) const
+                            { return getLimitedValue< sal_Int32, sal_Int64 >( nBytes, 0, mnSize - mnRelPos ); }
+
+private:
+    BinaryInputStream*  mpInStrm;
+    sal_Int64           mnStartPos;
+    sal_Int64           mnRelPos;
+    sal_Int64           mnSize;
+};
+
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/oox/helper/binaryoutputstream.hxx b/include/oox/helper/binaryoutputstream.hxx
new file mode 100644
index 0000000000..c1dc8ebb0e
--- /dev/null
+++ b/include/oox/helper/binaryoutputstream.hxx
@@ -0,0 +1,208 @@
+/* -*- 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_OOX_HELPER_BINARYOUTPUTSTREAM_HXX
+#define INCLUDED_OOX_HELPER_BINARYOUTPUTSTREAM_HXX
+
+#include <cstddef>
+#include <memory>
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <oox/dllapi.h>
+#include <oox/helper/binarystreambase.hxx>
+#include <oox/helper/helper.hxx>
+#include <rtl/textenc.h>
+#include <rtl/ustring.hxx>
+#include <sal/types.h>
+
+namespace com::sun::star {
+    namespace io { class XOutputStream; }
+}
+
+namespace oox {
+
+
+/** Interface for binary output stream classes.
+
+    The binary data in the stream is written in little-endian format.
+ */
+class BinaryOutputStream : public virtual BinaryStreamBase
+{
+public:
+    /** Derived classes implement writing the contents of the passed data
+        sequence.
+
+        @param nAtomSize
+            The size of the elements in the memory block, if available. Derived
+            classes may be interested in this information.
+     */
+    virtual void        writeData( const StreamDataSequence& rData, size_t nAtomSize = 1 ) = 0;
+
+    /** Derived classes implement writing the contents of the (preallocated!)
+        memory buffer pMem.
+
+        @param nAtomSize
+            The size of the elements in the memory block, if available. Derived
+            classes may be interested in this information.
+     */
+    virtual void        writeMemory( const void* pMem, sal_Int32 nBytes, size_t nAtomSize = 1 ) = 0;
+
+    template< typename Type >
+    void writeArray( Type* opnArray, sal_Int32 nElemCount );
+
+    template< typename Type >
+    void writeArray( const Type* opnArray, sal_Int32 nElemCount );
+
+    /** Writes a value to the stream and converts it to platform byte order.
+        All data types supported by the ByteOrderConverter class can be used.
+     */
+    template< typename Type >
+    void                  writeValue( Type nValue );
+
+    BinaryOutputStream&   WriteInt16(sal_Int16 x)   { writeValue(x); return *this; }
+    BinaryOutputStream&   WriteUInt16(sal_uInt16 x) { writeValue(x); return *this; }
+    BinaryOutputStream&   WriteInt32(sal_Int32 x)   { writeValue(x); return *this; }
+    BinaryOutputStream&   WriteUInt32(sal_uInt32 x) { writeValue(x); return *this; }
+    BinaryOutputStream&   WriteInt64(sal_Int64 x)   { writeValue(x); return *this; }
+
+    void writeCompressedUnicodeArray( const OUString& rString, bool bCompressed );
+
+    void writeCharArrayUC( std::u16string_view rString, rtl_TextEncoding eTextEnc );
+
+    void writeUnicodeArray( const OUString& rString );
+
+protected:
+    /** This dummy default c'tor will never call the c'tor of the virtual base
+        class BinaryStreamBase as this class cannot be instantiated directly. */
+    BinaryOutputStream() : BinaryStreamBase( false ) {}
+
+private:
+    BinaryOutputStream( BinaryOutputStream const& ) = delete;
+    BinaryOutputStream& operator=( BinaryOutputStream const& ) = delete;
+};
+
+template< typename Type >
+void BinaryOutputStream::writeArray( Type* opnArray, sal_Int32 nElemCount )
+{
+    sal_Int32 nWriteSize = getLimitedValue< sal_Int32, sal_Int32 >( nElemCount, 0, SAL_MAX_INT32 / sizeof( Type ) ) * sizeof( Type );
+    ByteOrderConverter::convertLittleEndianArray( opnArray, static_cast< size_t >( nElemCount ) );
+    writeMemory( opnArray, nWriteSize, sizeof( Type ) );
+}
+
+template< typename Type >
+void BinaryOutputStream::writeArray( const Type* opnArray, sal_Int32 nElemCount )
+{
+    std::unique_ptr<Type[]> xArray(new Type[nElemCount]);
+    std::uninitialized_copy(opnArray, opnArray + nElemCount, xArray.get());
+    writeArray(xArray.get(), nElemCount);
+}
+
+template< typename Type >
+void BinaryOutputStream::writeValue( Type nValue )
+{
+    ByteOrderConverter::convertLittleEndian( nValue );
+    writeMemory( &nValue, static_cast< sal_Int32 >( sizeof( Type ) ), sizeof( Type ) );
+}
+
+
+/** Wraps a UNO output stream and provides convenient access functions.
+
+    The binary data in the stream is written in little-endian format.
+ */
+class OOX_DLLPUBLIC BinaryXOutputStream final : public BinaryXSeekableStream, public BinaryOutputStream
+{
+public:
+    /** Constructs the wrapper object for the passed output stream.
+
+        @param rxOutStream
+            The com.sun.star.io.XOutputStream interface of the output stream to
+            be wrapped.
+
+        @param bAutoClose
+            True = automatically close the wrapped output stream on destruction
+            of this wrapper or when close() is called.
+     */
+    explicit            BinaryXOutputStream(
+                            const css::uno::Reference< css::io::XOutputStream >& rxOutStrm,
+                            bool bAutoClose );
+
+    virtual             ~BinaryXOutputStream() override;
+
+    /** Flushes and closes the output stream. Does also close the wrapped UNO
+        output stream if bAutoClose has been set to true in the constructor. */
+    void                close() override;
+
+    /** Writes the passed data sequence. */
+    virtual void        writeData( const StreamDataSequence& rData, size_t nAtomSize = 1 ) override;
+
+    /** Write nBytes bytes from the (preallocated!) buffer pMem. */
+    virtual void        writeMemory( const void* pMem, sal_Int32 nBytes, size_t nAtomSize = 1 ) override;
+
+private:
+    StreamDataSequence  maBuffer;       ///< Data buffer used in writeMemory() function.
+    css::uno::Reference< css::io::XOutputStream >
+                        mxOutStrm;      ///< Reference to the output stream.
+    bool                mbAutoClose;    ///< True = automatically close stream on destruction.
+};
+
+
+/** Wraps a StreamDataSequence and provides convenient access functions.
+
+    The binary data in the stream is written in little-endian format. After
+    construction, the stream points to the beginning of the passed data
+    sequence. The data sequence is expanded automatically while writing to it.
+ */
+class SequenceOutputStream final : public BinaryOutputStream
+{
+public:
+    /** Constructs the wrapper object for the passed data sequence.
+
+        @attention
+            The passed data sequence MUST live at least as long as this stream
+            wrapper. The data sequence MUST NOT be changed from outside as long
+            as this stream wrapper is used to write to it.
+     */
+    explicit            SequenceOutputStream( StreamDataSequence & rData );
+
+    /** Writes the passed data sequence. */
+    virtual void        writeData( const StreamDataSequence& rData, size_t nAtomSize = 1 ) override;
+
+    /** Write nBytes bytes from the (preallocated!) buffer pMem. */
+    virtual void        writeMemory( const void* pMem, sal_Int32 nBytes, size_t nAtomSize = 1 ) override;
+
+    /** Returns the size of the wrapped data sequence. */
+    virtual sal_Int64   size() const override;
+    /** Returns the current stream position. */
+    virtual sal_Int64   tell() const override;
+    /** Seeks the stream to the passed position. */
+    virtual void        seek( sal_Int64 nPos ) override;
+    /** Releases the reference to the data sequence. */
+    virtual void        close() override;
+
+private:
+    StreamDataSequence* mpData;   ///< Wrapped data sequence.
+    sal_Int32           mnPos;          ///< Current position in the sequence.
+};
+
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/oox/helper/binarystreambase.hxx b/include/oox/helper/binarystreambase.hxx
new file mode 100644
index 0000000000..8e93d14586
--- /dev/null
+++ b/include/oox/helper/binarystreambase.hxx
@@ -0,0 +1,179 @@
+/* -*- 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_OOX_HELPER_BINARYSTREAMBASE_HXX
+#define INCLUDED_OOX_HELPER_BINARYSTREAMBASE_HXX
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <com/sun/star/uno/Sequence.hxx>
+#include <oox/dllapi.h>
+#include <sal/types.h>
+
+namespace com::sun::star {
+    namespace io { class XSeekable; }
+}
+
+namespace oox {
+
+typedef css::uno::Sequence< sal_Int8 > StreamDataSequence;
+
+
+/** Base class for binary stream classes.
+ */
+class OOX_DLLPUBLIC BinaryStreamBase
+{
+public:
+    virtual             ~BinaryStreamBase();
+
+    /** Implementations return the size of the stream, if possible.
+
+        This function may be implemented for some types of unseekable streams,
+        and MUST be implemented for all seekable streams.
+
+        @return
+            The size of the stream in bytes, or -1, if not implemented.
+     */
+    virtual sal_Int64   size() const = 0;
+
+    /** Implementations return the current stream position, if possible.
+
+        This function may be implemented for some types of unseekable streams,
+        and MUST be implemented for all seekable streams.
+
+        @return
+            The current position in the stream, or -1, if not implemented.
+     */
+    virtual sal_Int64   tell() const = 0;
+
+    /** Implementations seek the stream to the passed position, if
+        the stream is seekable.
+     */
+    virtual void        seek( sal_Int64 nPos ) = 0;
+
+    /** Implementations close the stream.
+     */
+    virtual void        close() = 0;
+
+    /** Returns true, if the implementation supports the seek() operation.
+
+        Implementations may still implement size() and tell() even if the
+        stream is not seekable.
+     */
+    bool         isSeekable() const { return mbSeekable; }
+
+    /** Returns true, if the stream position is invalid (EOF). This flag turns
+        true *after* the first attempt to seek/read beyond the stream end.
+     */
+    bool         isEof() const { return mbEof; }
+
+    /** Returns the size of the remaining data available in the stream, if
+        stream supports size() and tell(), otherwise -1.
+     */
+    sal_Int64           getRemaining() const;
+
+    /** Seeks the stream to the beginning, if stream is seekable.
+     */
+    void         seekToStart() { seek( 0 ); }
+
+    /** Seeks the stream forward to a position that is a multiple of the passed
+        block size, if stream is seekable.
+
+        @param nBlockSize
+            The size of the data blocks the streams needs to be aligned to.
+
+        @param nAnchorPos
+            Position in the stream the data blocks are aligned to.
+     */
+    void                alignToBlock( sal_Int32 nBlockSize, sal_Int64 nAnchorPos );
+
+protected:
+    explicit            BinaryStreamBase( bool bSeekable ) : mbEof( false ), mbSeekable( bSeekable ) {}
+
+private:
+                        BinaryStreamBase( const BinaryStreamBase& ) = delete;
+    BinaryStreamBase&   operator=( const BinaryStreamBase& ) = delete;
+
+protected:
+    bool                mbEof;          ///< End of stream flag.
+
+private:
+    const bool          mbSeekable;     ///< True = implementation supports seeking.
+};
+
+
+/** Base class for binary input and output streams wrapping a UNO stream,
+    seekable via the com.sun.star.io.XSeekable interface.
+ */
+class BinaryXSeekableStream : public virtual BinaryStreamBase
+{
+public:
+    virtual             ~BinaryXSeekableStream() override;
+
+    /** Returns the size of the stream, if wrapped stream is seekable, otherwise -1. */
+    virtual sal_Int64   size() const override;
+    /** Returns the current stream position, if wrapped stream is seekable, otherwise -1. */
+    virtual sal_Int64   tell() const override;
+    /** Seeks the stream to the passed position, if wrapped stream is seekable. */
+    virtual void        seek( sal_Int64 nPos ) override;
+    /** Releases the reference to the UNO XSeekable interface. */
+    virtual void        close() override;
+
+protected:
+    explicit            BinaryXSeekableStream(
+                            const css::uno::Reference< css::io::XSeekable >& rxSeekable );
+
+private:
+    css::uno::Reference< css::io::XSeekable >
+                        mxSeekable;     ///< Stream seeking interface.
+};
+
+
+/** Base class for binary input and output streams wrapping a
+    StreamDataSequence, which is always seekable.
+
+    The wrapped data sequence MUST live at least as long as this stream
+    wrapper. The data sequence MUST NOT be changed from outside as long as this
+    stream wrapper is used to modify it.
+ */
+class OOX_DLLPUBLIC SequenceSeekableStream : public virtual BinaryStreamBase
+{
+public:
+    /** Returns the size of the wrapped data sequence. */
+    virtual sal_Int64   size() const override;
+    /** Returns the current stream position. */
+    virtual sal_Int64   tell() const override;
+    /** Seeks the stream to the passed position. */
+    virtual void        seek( sal_Int64 nPos ) override;
+    /** Releases the reference to the data sequence. */
+    virtual void        close() override;
+
+protected:
+    explicit            SequenceSeekableStream( const StreamDataSequence& rData );
+
+protected:
+    const StreamDataSequence* mpData;   ///< Wrapped data sequence.
+    sal_Int32           mnPos;          ///< Current position in the sequence.
+};
+
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/oox/helper/containerhelper.hxx b/include/oox/helper/containerhelper.hxx
new file mode 100644
index 0000000000..3b725d5094
--- /dev/null
+++ b/include/oox/helper/containerhelper.hxx
@@ -0,0 +1,298 @@
+/* -*- 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_OOX_HELPER_CONTAINERHELPER_HXX
+#define INCLUDED_OOX_HELPER_CONTAINERHELPER_HXX
+
+#include <cstddef>
+#include <vector>
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <com/sun/star/uno/Sequence.hxx>
+#include <oox/dllapi.h>
+#include <rtl/ustring.hxx>
+#include <sal/types.h>
+
+namespace com::sun::star {
+    namespace container { class XNameAccess; }
+    namespace container { class XNameContainer; }
+    namespace uno { class Any; }
+}
+
+namespace oox {
+
+
+/** A range of signed 32-bit integer values. */
+struct ValueRange
+{
+    sal_Int32           mnFirst;
+    sal_Int32           mnLast;
+
+    explicit     ValueRange( sal_Int32 nValue ) : mnFirst( nValue ), mnLast( nValue ) {}
+    explicit     ValueRange( sal_Int32 nFirst, sal_Int32 nLast ) : mnFirst( nFirst ), mnLast( nLast ) {}
+
+    bool         operator==( const ValueRange& rRange ) const { return (mnFirst == rRange.mnFirst) && (mnLast == rRange.mnLast); }
+    bool         operator!=( const ValueRange& rRange ) const { return !(*this == rRange); }
+    bool         contains( const ValueRange& rRange ) const { return (mnFirst <= rRange.mnFirst) && (rRange.mnLast <= mnLast); }
+    bool         intersects( const ValueRange& rRange ) const { return (mnFirst <= rRange.mnLast) && (rRange.mnFirst <= mnLast); }
+};
+
+
+typedef ::std::vector< ValueRange > ValueRangeVector;
+
+
+/** An ordered list of value ranges. The insertion operation will merge
+    consecutive value ranges.
+ */
+class OOX_DLLPUBLIC ValueRangeSet
+{
+public:
+                        ValueRangeSet() {}
+
+    /** Inserts the passed value range into the range list. */
+    void                insert( const ValueRange& rRange );
+
+    /** Returns the ordered list of all value ranges. */
+    const ValueRangeVector& getRanges() const { return maRanges; }
+
+private:
+    ValueRangeVector    maRanges;
+};
+
+
+/** Template for a 2-dimensional array of objects.
+
+    This class template provides a similar interface to the ::std::vector
+    template.
+ */
+template< typename Type >
+class Matrix
+{
+public:
+    typedef ::std::vector< Type >                       container_type;
+    typedef typename container_type::value_type         value_type;
+    typedef typename container_type::pointer            pointer;
+    typedef typename container_type::reference          reference;
+    typedef typename container_type::const_reference    const_reference;
+    typedef typename container_type::size_type          size_type;
+    typedef typename container_type::iterator           iterator;
+    typedef typename container_type::const_iterator     const_iterator;
+
+                 Matrix() : mnWidth( 0 ) {}
+    explicit     Matrix( size_type nWidth, size_type nHeight ) { resize( nWidth, nHeight ); }
+    explicit     Matrix( size_type nWidth, size_type nHeight, const_reference rData ) { resize( nWidth, nHeight, rData ); }
+
+    bool         empty() const { return maData.empty(); }
+    size_type    size() const { return maData.size(); }
+    size_type    width() const { return mnWidth; }
+    size_type    height() const { return empty() ? 0 : (size() / width()); }
+
+    void         clear() { resize( 0, 0 ); }
+    void         resize( size_type nWidth, size_type nHeight ) { mnWidth = nWidth; maData.resize( nWidth * nHeight ); }
+    void         resize( size_type nWidth, size_type nHeight, const_reference rData ) { mnWidth = nWidth; maData.resize( nWidth * nHeight, rData ); }
+
+    iterator     at( size_type nX, size_type nY ) { return maData.begin() + mnWidth * nY + nX; }
+    const_iterator at( size_type nX, size_type nY ) const { return maData.begin() + mnWidth * nY + nX; }
+
+    reference    operator()( size_type nX, size_type nY ) { return *at( nX, nY ); }
+    const_reference operator()( size_type nX, size_type nY ) const { return *at( nX, nY ); }
+
+    iterator     begin() { return maData.begin(); }
+    const_iterator begin() const { return maData.begin(); }
+    iterator     end() { return maData.end(); }
+    const_iterator end() const { return maData.end(); }
+
+    iterator     row_begin( size_type nY ) { return at( 0, nY ); }
+    const_iterator row_begin( size_type nY ) const { return at( 0, nY ); }
+    iterator     row_end( size_type nY ) { return at( mnWidth, nY ); }
+    const_iterator row_end( size_type nY ) const { return at( mnWidth, nY ); }
+
+    reference    row_front( size_type nY ) { return (*this)( 0, nY ); }
+    const_reference row_front( size_type nY ) const { return (*this)( 0, nY ); }
+
+private:
+    container_type      maData;
+    size_type           mnWidth;
+};
+
+
+/** Static helper functions for improved API container handling. */
+class OOX_DLLPUBLIC ContainerHelper
+{
+public:
+
+    /** Returns a name that is not used in the passed name container.
+
+        @param rxNameAccess  com.sun.star.container.XNameAccess interface of
+            the name container.
+
+        @param rSuggestedName  Suggested name for the object.
+
+        @return  An unused name. Will be equal to the suggested name, if not
+            contained, otherwise a numerical index will be appended.
+     */
+    static OUString getUnusedName(
+                            const css::uno::Reference< css::container::XNameAccess >& rxNameAccess,
+                            const OUString& rSuggestedName,
+                            sal_Unicode cSeparator );
+
+    /** Inserts an object into a name container.
+
+        @param rxNameContainer  com.sun.star.container.XNameContainer interface
+            of the name container.
+
+        @param rName  Exact name for the object.
+
+        @param rObject  The object to be inserted.
+
+        @return  True = object successfully inserted.
+     */
+    static bool         insertByName(
+                            const css::uno::Reference< css::container::XNameContainer >& rxNameContainer,
+                            const OUString& rName,
+                            const css::uno::Any& rObject );
+
+    /** Inserts an object into a name container.
+
+        The function will use an unused name to insert the object, based on the
+        suggested object name. It is possible to specify whether the existing
+        object or the new inserted object will be renamed, if the container
+        already has an object with the name suggested for the new object.
+
+        @param rxNameContainer  com.sun.star.container.XNameContainer interface
+            of the name container.
+
+        @param rSuggestedName  Suggested name for the object.
+
+        @param rObject  The object to be inserted.
+
+        The new object
+        will be inserted with a name not yet extant in the container (this
+        is done by appending a numerical index to the suggested name).
+
+        @return  The final name the object is inserted with. Will always be
+            equal to the suggested name, if parameter bRenameOldExisting is
+            true.
+     */
+    static OUString insertByUnusedName(
+                            const css::uno::Reference< css::container::XNameContainer >& rxNameContainer,
+                            const OUString& rSuggestedName,
+                            sal_Unicode cSeparator,
+                            const css::uno::Any& rObject );
+
+    // std::vector and std::map element access --------------------------------
+
+    /** Returns the pointer to an existing element of the passed vector, or a
+        null pointer, if the passed index is out of bounds. */
+    template< typename VectorType >
+    static const typename VectorType::value_type*
+                        getVectorElement( const VectorType& rVector, sal_Int32 nIndex );
+
+    /** Returns the pointer to an existing element of the passed vector, or a
+        null pointer, if the passed index is out of bounds. */
+    template< typename VectorType >
+    static typename VectorType::value_type*
+                        getVectorElementAccess( VectorType& rVector, sal_Int32 nIndex );
+
+    /** Returns the reference to an existing element of the passed vector, or
+        the passed default value, if the passed index is out of bounds. */
+    template< typename VectorType >
+    static const typename VectorType::value_type&
+                        getVectorElement( const VectorType& rVector, sal_Int32 nIndex, const typename VectorType::value_type& rDefault );
+
+    /** Returns the pointer to an existing element of the passed map, or a null
+        pointer, if an element with the passed key does not exist. */
+    template< typename MapType >
+    static const typename MapType::mapped_type*
+                        getMapElement( const MapType& rMap, const typename MapType::key_type& rKey );
+
+    /** Returns the reference to an existing element of the passed map, or the
+        passed default value, if an element with the passed key does not exist. */
+    template< typename MapType >
+    static const typename MapType::mapped_type&
+                        getMapElement( const MapType& rMap, const typename MapType::key_type& rKey, const typename MapType::mapped_type& rDefault );
+
+    /** Creates a UNO sequence of sequences from a matrix with copies of all elements.
+
+        @param rMatrix  The matrix to be converted to a sequence of sequences.
+
+        @return  A com.sun.star.uno.Sequence object containing
+            com.sun.star.uno.Sequence objects with copies of all objects
+            contained in the passed matrix.
+     */
+    template< typename MatrixType >
+    static css::uno::Sequence< css::uno::Sequence< typename MatrixType::value_type > >
+                            matrixToSequenceSequence( const MatrixType& rMatrix );
+};
+
+
+template< typename VectorType >
+/*static*/ const typename VectorType::value_type* ContainerHelper::getVectorElement( const VectorType& rVector, sal_Int32 nIndex )
+{
+    return ((0 <= nIndex) && (static_cast< size_t >( nIndex ) < rVector.size())) ? &rVector[ static_cast< size_t >( nIndex ) ] : nullptr;
+}
+
+template< typename VectorType >
+/*static*/ typename VectorType::value_type* ContainerHelper::getVectorElementAccess( VectorType& rVector, sal_Int32 nIndex )
+{
+    return ((0 <= nIndex) && (static_cast< size_t >( nIndex ) < rVector.size())) ? &rVector[ static_cast< size_t >( nIndex ) ] : nullptr;
+}
+
+template< typename VectorType >
+/*static*/ const typename VectorType::value_type& ContainerHelper::getVectorElement( const VectorType& rVector, sal_Int32 nIndex, const typename VectorType::value_type& rDefault )
+{
+    return ((0 <= nIndex) && (static_cast< size_t >( nIndex ) < rVector.size())) ? rVector[ static_cast< size_t >( nIndex ) ] : rDefault;
+}
+
+template< typename MapType >
+/*static*/ const typename MapType::mapped_type* ContainerHelper::getMapElement( const MapType& rMap, const typename MapType::key_type& rKey )
+{
+    typename MapType::const_iterator aIt = rMap.find( rKey );
+    return (aIt == rMap.end()) ? nullptr : &aIt->second;
+}
+
+template< typename MapType >
+/*static*/ const typename MapType::mapped_type& ContainerHelper::getMapElement( const MapType& rMap, const typename MapType::key_type& rKey, const typename MapType::mapped_type& rDefault )
+{
+    typename MapType::const_iterator aIt = rMap.find( rKey );
+    return (aIt == rMap.end()) ? rDefault : aIt->second;
+}
+
+template< typename MatrixType >
+/*static*/ css::uno::Sequence< css::uno::Sequence< typename MatrixType::value_type > > ContainerHelper::matrixToSequenceSequence( const MatrixType& rMatrix )
+{
+    typedef typename MatrixType::value_type ValueType;
+    css::uno::Sequence< css::uno::Sequence< ValueType > > aSeq;
+    if( !rMatrix.empty() )
+    {
+        aSeq.realloc( static_cast< sal_Int32 >( rMatrix.height() ) );
+        auto pSeq = aSeq.getArray();
+        for( size_t nRow = 0, nHeight = rMatrix.height(); nRow < nHeight; ++nRow )
+            pSeq[ static_cast< sal_Int32 >( nRow ) ] =
+                css::uno::Sequence< ValueType >( &rMatrix.row_front( nRow ), static_cast< sal_Int32 >( rMatrix.width() ) );
+    }
+    return aSeq;
+}
+
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/oox/helper/grabbagstack.hxx b/include/oox/helper/grabbagstack.hxx
new file mode 100644
index 0000000000..bd03535c9a
--- /dev/null
+++ b/include/oox/helper/grabbagstack.hxx
@@ -0,0 +1,61 @@
+/* -*- 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/.
+ *
+ */
+
+#ifndef INCLUDED_OOX_HELPER_GRABBAGSTACK_HXX
+#define INCLUDED_OOX_HELPER_GRABBAGSTACK_HXX
+
+#include <stack>
+#include <vector>
+
+#include <com/sun/star/beans/PropertyValue.hpp>
+#include <oox/dllapi.h>
+#include <rtl/ustring.hxx>
+#include <sal/types.h>
+
+namespace com::sun::star {
+    namespace uno { class Any; }
+}
+
+namespace oox {
+
+struct GrabBagStackElement
+{
+    OUString maElementName;
+    std::vector<css::beans::PropertyValue> maPropertyList;
+};
+
+/// Tool that is useful for construction of a nested Sequence/PropertyValue hierarchy
+class OOX_DLLPUBLIC GrabBagStack final
+{
+private:
+    std::stack<GrabBagStackElement> mStack;
+    GrabBagStackElement mCurrentElement;
+
+public:
+    GrabBagStack(const OUString& aElementName);
+    ~GrabBagStack();
+
+    const OUString& getCurrentName() const { return mCurrentElement.maElementName;}
+
+    css::beans::PropertyValue getRootProperty();
+
+    void appendElement(const OUString& aName, const css::uno::Any& aAny);
+    void push(const OUString& aKey);
+    void pop();
+    void addInt32(const OUString& aElementName, sal_Int32 aIntValue);
+    void addString(const OUString& aElementName, const OUString& aStringValue);
+    bool isStackEmpty() const;
+};
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/oox/helper/graphichelper.hxx b/include/oox/helper/graphichelper.hxx
new file mode 100644
index 0000000000..0d0b692166
--- /dev/null
+++ b/include/oox/helper/graphichelper.hxx
@@ -0,0 +1,162 @@
+/* -*- 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_OOX_HELPER_GRAPHICHELPER_HXX
+#define INCLUDED_OOX_HELPER_GRAPHICHELPER_HXX
+
+#include <map>
+
+#include <com/sun/star/awt/DeviceInfo.hpp>
+#include <com/sun/star/uno/Reference.hxx>
+#include <oox/dllapi.h>
+#include <oox/helper/binarystreambase.hxx>
+#include <oox/helper/helper.hxx>
+#include <oox/helper/storagebase.hxx>
+#include <rtl/ustring.hxx>
+#include <sal/types.h>
+#include <com/sun/star/graphic/XGraphicProvider2.hpp>
+#include <com/sun/star/graphic/XGraphicMapper.hpp>
+#include <vcl/vclptr.hxx>
+
+struct WmfExternal;
+class OutputDevice;
+
+namespace com::sun::star {
+    namespace awt { struct Point; }
+    namespace awt { struct Size; }
+    namespace awt { class XUnitConversion; }
+    namespace io { class XInputStream; }
+    namespace frame { class XFrame; }
+    namespace graphic { class XGraphic; }
+    namespace graphic { class XGraphicObject; }
+    namespace graphic { class XGraphicProvider; }
+    namespace uno { class XComponentContext; }
+}
+
+namespace oox {
+
+
+/** Provides helper functions for colors, device measurement conversion,
+    graphics, and graphic objects handling.
+ */
+class OOX_DLLPUBLIC GraphicHelper
+{
+public:
+    explicit            GraphicHelper(
+                            const css::uno::Reference< css::uno::XComponentContext >& rxContext,
+                            const css::uno::Reference< css::frame::XFrame >& rxTargetFrame,
+                            StorageRef xStorage );
+    virtual             ~GraphicHelper();
+
+    // Avoid implicitly defined copy constructors/assignments for the DLLPUBLIC class (they may
+    // require forward-declared classes used internally to be defined in places using GraphicHelper)
+    GraphicHelper(const GraphicHelper&) = delete;
+    GraphicHelper(GraphicHelper&&) = delete;
+    GraphicHelper& operator=(const GraphicHelper&) = delete;
+    GraphicHelper& operator=(GraphicHelper&&) = delete;
+
+    // System colors and predefined colors ------------------------------------
+
+    /** Returns a system color specified by the passed XML token identifier. */
+    ::Color            getSystemColor( sal_Int32 nToken, ::Color nDefaultRgb = API_RGB_TRANSPARENT ) const;
+    /** Derived classes may implement to resolve a scheme color from the passed XML token identifier. */
+    virtual ::Color    getSchemeColor( sal_Int32 nToken ) const;
+    /** Derived classes may implement to resolve a palette index to an RGB color. */
+    virtual ::Color    getPaletteColor( sal_Int32 nPaletteIdx ) const;
+
+    virtual sal_Int32 getDefaultChartAreaFillStyle() const;
+
+    /** Returns chartspace automatic default border style */
+    static sal_Int32 getDefaultChartAreaLineStyle();
+
+    /** Returns chartspace automatic default border width in Emu */
+    static sal_Int16 getDefaultChartAreaLineWidth();
+
+    // Device info and device dependent unit conversion -----------------------
+
+    /** Returns information about the output device. */
+    const css::awt::DeviceInfo& getDeviceInfo() const { return maDeviceInfo;}
+
+    /** Converts the passed value from horizontal screen pixels to 1/100 mm. */
+    sal_Int32           convertScreenPixelXToHmm( double fPixelX ) const;
+    /** Converts the passed value from vertical screen pixels to 1/100 mm. */
+    sal_Int32           convertScreenPixelYToHmm( double fPixelY ) const;
+    /** Converts the passed size from screen pixels to 1/100 mm. */
+    css::awt::Size convertScreenPixelToHmm( const css::awt::Size& rPixel ) const;
+
+    /** Converts the passed value from 1/100 mm to horizontal screen pixels. */
+    double              convertHmmToScreenPixelX( sal_Int32 nHmmX ) const;
+    /** Converts the passed value from 1/100 mm to vertical screen pixels. */
+    double              convertHmmToScreenPixelY( sal_Int32 nHmmY ) const;
+    /** Converts the passed point from 1/100 mm to screen pixels. */
+    css::awt::Point convertHmmToScreenPixel( const css::awt::Point& rHmm ) const;
+    /** Converts the passed size from 1/100 mm to screen pixels. */
+    css::awt::Size convertHmmToScreenPixel( const css::awt::Size& rHmm ) const;
+
+    /** Converts the passed point from 1/100 mm to AppFont units. */
+    css::awt::Point convertHmmToAppFont( const css::awt::Point& rHmm ) const;
+    /** Converts the passed size from 1/100 mm to AppFont units. */
+    css::awt::Size convertHmmToAppFont( const css::awt::Size& rHmm ) const;
+
+
+    // Graphics and graphic objects  ------------------------------------------
+
+    /** Imports a graphic from the passed input stream. */
+    css::uno::Reference< css::graphic::XGraphic >
+                        importGraphic(
+                            const css::uno::Reference< css::io::XInputStream >& rxInStrm,
+                            const WmfExternal* pExtHeader = nullptr,
+                            const bool bLazyLoad = true ) const;
+
+    /** Imports a graphic from the passed binary memory block. */
+    css::uno::Reference< css::graphic::XGraphic >
+                        importGraphic( const StreamDataSequence& rGraphicData ) const;
+
+    /** Imports a graphic from the storage stream with the passed path and name. */
+    css::uno::Reference< css::graphic::XGraphic >
+                        importEmbeddedGraphic(
+                            const OUString& rStreamName,
+                            const WmfExternal* pExtHeader = nullptr ) const;
+
+    /** calculates the original size of a graphic which is necessary to be able to calculate cropping values
+        @return The original Graphic size in 100thmm */
+    css::awt::Size getOriginalSize( const css::uno::Reference< css::graphic::XGraphic >& rxGraphic ) const;
+
+    void setGraphicMapper(css::uno::Reference<css::graphic::XGraphicMapper> const & rxGraphicMapper);
+
+    void initializeGraphicMapperIfNeeded() const;
+private:
+
+    css::uno::Reference< css::uno::XComponentContext > mxContext;
+    css::uno::Reference< css::graphic::XGraphicProvider2 > mxGraphicProvider;
+    VclPtr<OutputDevice> mxDefaultOutputDevice;
+    css::awt::DeviceInfo maDeviceInfo; ///< Current output device info.
+    ::std::map< sal_Int32, ::Color >  maSystemPalette;  ///< Maps system colors (XML tokens) to RGB color values.
+    StorageRef          mxStorage;                  ///< Storage containing embedded graphics.
+    double              mfPixelPerHmmX;             ///< Number of screen pixels per 1/100 mm in X direction.
+    double              mfPixelPerHmmY;             ///< Number of screen pixels per 1/100 mm in Y direction.
+    css::uno::Reference<css::graphic::XGraphicMapper> mxGraphicMapper;
+};
+
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/oox/helper/helper.hxx b/include/oox/helper/helper.hxx
new file mode 100644
index 0000000000..f9bdd1cec9
--- /dev/null
+++ b/include/oox/helper/helper.hxx
@@ -0,0 +1,277 @@
+/* -*- 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_OOX_HELPER_HELPER_HXX
+#define INCLUDED_OOX_HELPER_HELPER_HXX
+
+#include <sal/config.h>
+
+#include <cstring>
+#include <limits>
+#include <optional>
+
+#include <o3tl/safeint.hxx>
+#include <osl/endian.h>
+#include <rtl/math.hxx>
+#include <sal/macros.h>
+#include <sal/types.h>
+#include <tools/color.hxx>
+
+namespace oox {
+
+// Helper macros ==============================================================
+
+namespace detail {
+
+//TODO: Temporary helper for STATIC_ARRAY_SELECT; ultimately, the latter should be replaced by a
+// proper function (template):
+template<typename T> constexpr std::make_unsigned_t<T> make_unsigned(T value) {
+    if constexpr (std::is_signed_v<T>) {
+        return o3tl::make_unsigned(value);
+    } else {
+        return value;
+    }
+}
+
+}
+
+/** Expands to the 'index'-th element of a STATIC data array, or to 'def', if
+    'index' is out of the array limits. */
+#define STATIC_ARRAY_SELECT( array, index, def ) \
+    ((detail::make_unsigned(index) < SAL_N_ELEMENTS(array)) ? ((array)[static_cast<size_t>(index)]) : (def))
+
+// Common constants ===========================================================
+
+const sal_uInt8 WINDOWS_CHARSET_ANSI        = 0;
+const sal_uInt8 WINDOWS_CHARSET_DEFAULT     = 1;
+const sal_uInt8 WINDOWS_CHARSET_SYMBOL      = 2;
+const sal_uInt8 WINDOWS_CHARSET_APPLE_ROMAN = 77;
+const sal_uInt8 WINDOWS_CHARSET_SHIFTJIS    = 128;
+const sal_uInt8 WINDOWS_CHARSET_HANGEUL     = 129;
+const sal_uInt8 WINDOWS_CHARSET_JOHAB       = 130;
+const sal_uInt8 WINDOWS_CHARSET_GB2312      = 134;
+const sal_uInt8 WINDOWS_CHARSET_BIG5        = 136;
+const sal_uInt8 WINDOWS_CHARSET_GREEK       = 161;
+const sal_uInt8 WINDOWS_CHARSET_TURKISH     = 162;
+const sal_uInt8 WINDOWS_CHARSET_VIETNAMESE  = 163;
+const sal_uInt8 WINDOWS_CHARSET_HEBREW      = 177;
+const sal_uInt8 WINDOWS_CHARSET_ARABIC      = 178;
+const sal_uInt8 WINDOWS_CHARSET_BALTIC      = 186;
+const sal_uInt8 WINDOWS_CHARSET_RUSSIAN     = 204;
+const sal_uInt8 WINDOWS_CHARSET_THAI        = 222;
+const sal_uInt8 WINDOWS_CHARSET_EASTERN     = 238;
+const sal_uInt8 WINDOWS_CHARSET_OEM         = 255;
+
+
+const ::Color API_RGB_TRANSPARENT         (ColorTransparency, 0xffffffff); ///< Transparent color for API calls.
+const sal_uInt32 UNSIGNED_RGB_TRANSPARENT = static_cast<sal_uInt32>(-1); ///< Transparent color for unsigned int32 places.
+const ::Color API_RGB_BLACK               (0x000000);  ///< Black color for API calls.
+const ::Color API_RGB_GRAY                (0x808080);  ///< Gray color for API calls.
+const ::Color API_RGB_WHITE               (0xFFFFFF);  ///< White color for API calls.
+
+const sal_Int16 API_LINE_SOLID              = 0;
+const sal_Int16 API_LINE_DOTTED             = 1;
+const sal_Int16 API_LINE_DASHED             = 2;
+const sal_Int16 API_FINE_LINE_DASHED        = 14;
+
+const sal_Int16 API_LINE_NONE               = 0;
+const sal_Int16 API_LINE_HAIR               = 2;
+const sal_Int16 API_LINE_THIN               = 35;
+const sal_Int16 API_LINE_MEDIUM             = 88;
+const sal_Int16 API_LINE_THICK              = 141;
+
+const sal_Int16 API_ESCAPE_NONE             = 0;        ///< No escapement.
+const sal_Int16 API_ESCAPE_SUPERSCRIPT      = 101;      ///< Superscript: raise characters automatically (magic value 101).
+const sal_Int16 API_ESCAPE_SUBSCRIPT        = -101;     ///< Subscript: lower characters automatically (magic value -101).
+
+const sal_Int8 API_ESCAPEHEIGHT_NONE        = 100;      ///< Relative character height if not escaped.
+const sal_Int8 API_ESCAPEHEIGHT_DEFAULT     = 58;       ///< Relative character height if escaped.
+
+
+// Limitate values ------------------------------------------------------------
+
+template< typename ReturnType, typename Type >
+inline ReturnType getLimitedValue( Type nValue, Type nMin, Type nMax )
+{
+    return static_cast< ReturnType >( ::std::clamp( nValue, nMin, nMax ) );
+}
+
+template< typename ReturnType, typename Type >
+inline ReturnType getIntervalValue( Type nValue, Type nBegin, Type nEnd )
+{
+    static_assert(::std::numeric_limits< Type >::is_integer, "is integer");
+    Type nInterval = nEnd - nBegin;
+    Type nCount = (nValue < nBegin) ? -((nBegin - nValue - 1) / nInterval + 1) : ((nValue - nBegin) / nInterval);
+    return static_cast< ReturnType >( nValue - nCount * nInterval );
+}
+
+template< typename ReturnType >
+inline ReturnType getDoubleIntervalValue( double fValue, double fBegin, double fEnd )
+{
+    double fInterval = fEnd - fBegin;
+    double fCount = (fValue < fBegin) ? -(::rtl::math::approxFloor( (fBegin - fValue - 1.0) / fInterval ) + 1.0) : ::rtl::math::approxFloor( (fValue - fBegin) / fInterval );
+    return static_cast< ReturnType >( fValue - fCount * fInterval );
+}
+
+// Read from bitfields --------------------------------------------------------
+
+/** Returns true, if at least one of the bits set in nMask is set in nBitField. */
+template< typename Type >
+inline bool getFlag( Type nBitField, Type nMask )
+{
+    return (nBitField & nMask) != 0;
+}
+
+/** Returns nSet, if at least one bit of nMask is set in nBitField, otherwise nUnset. */
+template< typename ReturnType, typename Type >
+inline ReturnType getFlagValue( Type nBitField, Type nMask, ReturnType nSet, ReturnType nUnset )
+{
+    return getFlag( nBitField, nMask ) ? nSet : nUnset;
+}
+
+/** Extracts a value from a bit field.
+
+    Returns the data fragment from nBitField, that starts at bit nStartBit
+    (0-based, bit 0 is rightmost) with the width of nBitCount. The returned
+    value will be right-aligned (normalized).
+    For instance: extractValue<T>(0x4321,8,4) returns 3 (value in bits 8-11).
+ */
+template< typename ReturnType, typename Type >
+inline ReturnType extractValue( Type nBitField, sal_uInt8 nStartBit, sal_uInt8 nBitCount )
+{
+    sal_uInt64 nMask = 1; nMask <<= nBitCount; --nMask;
+    return static_cast< ReturnType >( nMask & (nBitField >> nStartBit) );
+}
+
+// Write to bitfields ---------------------------------------------------------
+
+/** Sets or clears (according to bSet) all set bits of nMask in ornBitField. */
+template< typename Type >
+inline void setFlag( Type& ornBitField, Type nMask, bool bSet = true )
+{
+    if( bSet ) ornBitField |= nMask; else ornBitField &= ~nMask;
+}
+
+
+template< typename Type >
+void assignIfUsed( std::optional<Type>& rDestValue, const std::optional<Type>& rSourceValue )
+{
+    if( rSourceValue.has_value() )
+        rDestValue = rSourceValue.value();
+}
+
+
+/** Provides platform independent functions to convert from or to little-endian
+    byte order, e.g. for reading data from or writing data to memory or a
+    binary stream.
+
+    On big-endian platforms, the byte order in the passed values is swapped,
+    this can be used for converting big-endian to and from little-endian data.
+
+    On little-endian platforms, the conversion functions are implemented empty,
+    thus compilers should completely optimize away the function call.
+ */
+class ByteOrderConverter
+{
+public:
+#ifdef OSL_BIGENDIAN
+    static void  convertLittleEndian( sal_Int8& ) {}     // present for usage in templates
+    static void  convertLittleEndian( sal_uInt8& ) {}    // present for usage in templates
+    static void  convertLittleEndian( char16_t& rnValue )   { swap2( reinterpret_cast< sal_uInt8* >( &rnValue ) ); }
+    static void  convertLittleEndian( sal_Int16& rnValue )  { swap2( reinterpret_cast< sal_uInt8* >( &rnValue ) ); }
+    static void  convertLittleEndian( sal_uInt16& rnValue ) { swap2( reinterpret_cast< sal_uInt8* >( &rnValue ) ); }
+    static void  convertLittleEndian( sal_Int32& rnValue )  { swap4( reinterpret_cast< sal_uInt8* >( &rnValue ) ); }
+    static void  convertLittleEndian( sal_uInt32& rnValue ) { swap4( reinterpret_cast< sal_uInt8* >( &rnValue ) ); }
+    static void  convertLittleEndian( sal_Int64& rnValue )  { swap8( reinterpret_cast< sal_uInt8* >( &rnValue ) ); }
+    static void  convertLittleEndian( sal_uInt64& rnValue ) { swap8( reinterpret_cast< sal_uInt8* >( &rnValue ) ); }
+    static void  convertLittleEndian( float& rfValue )      { swap4( reinterpret_cast< sal_uInt8* >( &rfValue ) ); }
+    static void  convertLittleEndian( double& rfValue )     { swap8( reinterpret_cast< sal_uInt8* >( &rfValue ) ); }
+
+    template< typename Type >
+    inline static void  convertLittleEndianArray( Type* pnArray, size_t nElemCount );
+
+    static void  convertLittleEndianArray( sal_Int8*, size_t ) {}
+    static void  convertLittleEndianArray( sal_uInt8*, size_t ) {}
+
+#else
+    template< typename Type >
+    static void  convertLittleEndian( Type& ) {}
+
+    template< typename Type >
+    static void  convertLittleEndianArray( Type*, size_t ) {}
+
+#endif
+
+    /** Writes a value to memory, while converting it to little-endian.
+        @param pDstBuffer  The memory buffer to write the value to.
+        @param nValue  The value to be written to memory in little-endian.
+     */
+    template< typename Type >
+    inline static void  writeLittleEndian( void* pDstBuffer, Type nValue );
+
+#ifdef OSL_BIGENDIAN
+private:
+    inline static void  swap2( sal_uInt8* pnData );
+    inline static void  swap4( sal_uInt8* pnData );
+    inline static void  swap8( sal_uInt8* pnData );
+#endif
+};
+
+
+template< typename Type >
+inline void ByteOrderConverter::writeLittleEndian( void* pDstBuffer, Type nValue )
+{
+    convertLittleEndian( nValue );
+    memcpy( pDstBuffer, &nValue, sizeof( Type ) );
+}
+
+#ifdef OSL_BIGENDIAN
+template< typename Type >
+inline void ByteOrderConverter::convertLittleEndianArray( Type* pnArray, size_t nElemCount )
+{
+    for( Type* pnArrayEnd = pnArray + nElemCount; pnArray != pnArrayEnd; ++pnArray )
+        convertLittleEndian( *pnArray );
+}
+
+inline void ByteOrderConverter::swap2( sal_uInt8* pnData )
+{
+    ::std::swap( pnData[ 0 ], pnData[ 1 ] );
+}
+
+inline void ByteOrderConverter::swap4( sal_uInt8* pnData )
+{
+    ::std::swap( pnData[ 0 ], pnData[ 3 ] );
+    ::std::swap( pnData[ 1 ], pnData[ 2 ] );
+}
+
+inline void ByteOrderConverter::swap8( sal_uInt8* pnData )
+{
+    ::std::swap( pnData[ 0 ], pnData[ 7 ] );
+    ::std::swap( pnData[ 1 ], pnData[ 6 ] );
+    ::std::swap( pnData[ 2 ], pnData[ 5 ] );
+    ::std::swap( pnData[ 3 ], pnData[ 4 ] );
+}
+#endif
+
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/oox/helper/modelobjecthelper.hxx b/include/oox/helper/modelobjecthelper.hxx
new file mode 100644
index 0000000000..6d4b1fea19
--- /dev/null
+++ b/include/oox/helper/modelobjecthelper.hxx
@@ -0,0 +1,134 @@
+/* -*- 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_OOX_HELPER_MODELOBJECTHELPER_HXX
+#define INCLUDED_OOX_HELPER_MODELOBJECTHELPER_HXX
+
+#include <com/sun/star/uno/Any.hxx>
+#include <com/sun/star/uno/Reference.hxx>
+#include <oox/dllapi.h>
+#include <rtl/ustring.hxx>
+#include <sal/types.h>
+
+namespace com::sun::star {
+    namespace awt { struct Gradient;
+                    struct Gradient2;
+                    class XBitmap; }
+    namespace graphic { class XGraphic; }
+    namespace container { class XNameContainer; }
+    namespace drawing { struct LineDash; }
+    namespace drawing { struct Hatch; }
+    namespace drawing { struct PolyPolygonBezierCoords; }
+    namespace lang { class XMultiServiceFactory; }
+}
+
+namespace oox {
+
+
+/** This helper manages named objects in a container, which is created on demand.
+ */
+class OOX_DLLPUBLIC ObjectContainer
+{
+public:
+    explicit            ObjectContainer(
+                            const css::uno::Reference< css::lang::XMultiServiceFactory >& rxModelFactory,
+                            OUString aServiceName );
+                        ~ObjectContainer();
+
+    /** Returns true, if the object with the passed name exists in the container. */
+    bool                hasObject( const OUString& rObjName ) const;
+
+    css::uno::Any getObject( const OUString& rObjName ) const;
+
+    /** Inserts the passed object into the container, returns its final name. */
+    OUString     insertObject(
+                            const OUString& rObjName,
+                            const css::uno::Any& rObj,
+                            bool bInsertByUnusedName );
+
+private:
+    void                createContainer() const;
+
+private:
+    mutable css::uno::Reference< css::lang::XMultiServiceFactory >
+                        mxModelFactory;         ///< Factory to create the container.
+    mutable css::uno::Reference< css::container::XNameContainer >
+                        mxContainer;            ///< Container for the objects.
+    OUString            maServiceName;          ///< Service name to create the container.
+    sal_Int32           mnIndex;                ///< Index to create unique identifiers.
+};
+
+
+/** Contains tables for named drawing objects for a document model.
+
+    Contains tables for named line markers, line dashes, fill gradients, and
+    fill bitmap URLs. The class is needed to handle different document models
+    in the same filter (e.g. embedded charts) which carry their own drawing
+    object tables.
+ */
+class OOX_DLLPUBLIC ModelObjectHelper
+{
+public:
+    explicit            ModelObjectHelper(
+                            const css::uno::Reference< css::lang::XMultiServiceFactory >& rxModelFactory );
+
+    /** Returns true, if the model contains a line marker with the passed name. */
+    bool                hasLineMarker( const OUString& rMarkerName ) const;
+
+    /** Inserts a new named line marker, overwrites an existing line marker
+        with the same name. Returns true, if the marker could be inserted. */
+    bool                insertLineMarker(
+                            const OUString& rMarkerName,
+                            const css::drawing::PolyPolygonBezierCoords& rMarker );
+
+    /** Inserts a new named line dash, returns the line dash name, based on an
+        internal constant name with a new unused index appended. */
+    OUString     insertLineDash( const css::drawing::LineDash& rDash );
+
+    /** Inserts a new named fill gradient, returns the gradient name, based on
+        an internal constant name with a new unused index appended. */
+    OUString     insertFillGradient( const css::awt::Gradient2& rGradient );
+    OUString     insertFillGradient( const css::awt::Gradient& rGradient );
+
+    OUString     insertTransGrandient( const css::awt::Gradient2& rGradient );
+    OUString     insertTransGrandient( const css::awt::Gradient& rGradient );
+
+    OUString     insertFillHatch( const css::drawing::Hatch& rHatch );
+
+    /** Inserts a new named fill graphic, returns the bitmap name, based on
+        an internal constant name with a new unused index appended. */
+    OUString insertFillBitmapXGraphic(css::uno::Reference<css::graphic::XGraphic> const & rxGraphic);
+
+    css::uno::Reference<css::awt::XBitmap> getFillBitmap(OUString const & rGraphicName);
+
+private:
+    ObjectContainer     maMarkerContainer;      ///< Contains all named line markers (line end polygons).
+    ObjectContainer     maDashContainer;        ///< Contains all named line dashes.
+    ObjectContainer     maGradientContainer;    ///< Contains all named fill gradients.
+    ObjectContainer     maTransGradContainer;   ///< Contains all named transparency Gradients.
+    ObjectContainer     maBitmapUrlContainer;   ///< Contains all named fill bitmap URLs.
+    ObjectContainer     maHatchContainer;       ///< Contains all named fill hatches.
+};
+
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/oox/helper/progressbar.hxx b/include/oox/helper/progressbar.hxx
new file mode 100644
index 0000000000..e1c5c0a996
--- /dev/null
+++ b/include/oox/helper/progressbar.hxx
@@ -0,0 +1,132 @@
+/* -*- 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_OOX_HELPER_PROGRESSBAR_HXX
+#define INCLUDED_OOX_HELPER_PROGRESSBAR_HXX
+
+#include <memory>
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <oox/dllapi.h>
+#include <rtl/ustring.hxx>
+
+namespace com::sun::star {
+    namespace task { class XStatusIndicator; }
+}
+
+namespace oox {
+
+// Interfaces =================================================================
+
+/** Interface for progress bar classes.
+ */
+class OOX_DLLPUBLIC IProgressBar
+{
+public:
+    virtual             ~IProgressBar();
+
+    /** Returns the current position of the progress bar.
+
+        @return  Position of the progress bar, in the range from 0.0 (beginning
+        of the progress bar) to 1.0 (end of the progress bar) inclusive.
+     */
+    virtual double      getPosition() const = 0;
+
+    /** Sets the current position of the progress bar.
+
+        @param fPosition  New position of the progress bar, in the range from
+        0.0 (beginning of the progress bar) to 1.0 (end of the progress bar)
+        inclusive.
+     */
+    virtual void        setPosition( double fPosition ) = 0;
+};
+
+
+class ISegmentProgressBar;
+typedef std::shared_ptr< ISegmentProgressBar > ISegmentProgressBarRef;
+
+/** Interface for a segment in a progress bar, that is able to create sub
+    segments from itself.
+ */
+class OOX_DLLPUBLIC ISegmentProgressBar : public IProgressBar
+{
+public:
+    virtual             ~ISegmentProgressBar() override;
+
+    /** Returns the length that is still free for creating sub segments. */
+    virtual double      getFreeLength() const = 0;
+
+    /** Adds a new segment with the specified length. */
+    virtual ISegmentProgressBarRef createSegment( double fLength ) = 0;
+};
+
+
+/** A simple progress bar.
+ */
+class OOX_DLLPUBLIC ProgressBar final : public IProgressBar
+{
+public:
+    explicit            ProgressBar(
+                            const css::uno::Reference< css::task::XStatusIndicator >& rxIndicator,
+                            const OUString& rText );
+
+    virtual             ~ProgressBar() override;
+
+    /** Returns the current position of the progress bar. */
+    virtual double      getPosition() const override;
+    /** Sets the current position of the progress bar. */
+    virtual void        setPosition( double fPosition ) override;
+
+private:
+    css::uno::Reference< css::task::XStatusIndicator >
+                        mxIndicator;
+    double              mfPosition;
+};
+
+
+/** A progress bar containing several independent segments.
+ */
+class OOX_DLLPUBLIC SegmentProgressBar final : public ISegmentProgressBar
+{
+public:
+    explicit            SegmentProgressBar(
+                            const css::uno::Reference< css::task::XStatusIndicator >& rxIndicator,
+                            const OUString& rText );
+
+    /** Returns the current position of the progress bar segment. */
+    virtual double      getPosition() const override;
+    /** Sets the current position of the progress bar segment. */
+    virtual void        setPosition( double fPosition ) override;
+
+    /** Returns the length that is still free for creating sub segments. */
+    virtual double      getFreeLength() const override;
+    /** Adds a new segment with the specified length. */
+    virtual ISegmentProgressBarRef createSegment( double fLength ) override;
+
+private:
+    ProgressBar         maProgress;
+    double              mfFreeStart;
+};
+
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/oox/helper/propertymap.hxx b/include/oox/helper/propertymap.hxx
new file mode 100644
index 0000000000..cf8031d46d
--- /dev/null
+++ b/include/oox/helper/propertymap.hxx
@@ -0,0 +1,128 @@
+/* -*- 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_OOX_HELPER_PROPERTYMAP_HXX
+#define INCLUDED_OOX_HELPER_PROPERTYMAP_HXX
+
+#include <map>
+#include <utility>
+#include <vector>
+
+#include <com/sun/star/uno/Any.hxx>
+#include <com/sun/star/uno/Reference.hxx>
+#include <com/sun/star/uno/Sequence.hxx>
+#include <oox/dllapi.h>
+#include <rtl/ustring.hxx>
+#include <sal/types.h>
+
+namespace com::sun::star::beans {
+    struct PropertyValue;
+    class XPropertySet;
+}
+
+namespace oox {
+
+
+typedef ::std::map< OUString, css::uno::Any > PropertyNameMap;
+
+/** A helper that maps property identifiers to property values.
+
+    The property identifiers are generated on compile time and refer to the
+    property name strings that are held by a static vector. The identifier to
+    name mapping is done internally while the properties are written to
+    property sets.
+ */
+class OOX_DLLPUBLIC PropertyMap
+{
+public:
+    PropertyMap();
+
+    /** Returns the name of the passed property identifier. */
+    static const OUString& getPropertyName( sal_Int32 nPropId );
+
+    /** Returns the property identifier of the passed name. */
+    static sal_Int32 getPropertyId( std::u16string_view sPropName );
+
+    /** Returns true, if the map contains a property with the passed identifier. */
+    bool                hasProperty( sal_Int32 nPropId ) const;
+
+    /** Sets the specified property to the passed value. Does nothing, if the
+        identifier is invalid. */
+    bool                setAnyProperty( sal_Int32 nPropId, const css::uno::Any& rValue );
+
+    /** Sets the specified property to the passed value. Does nothing, if the
+        identifier is invalid. */
+    template< typename Type >
+    bool                setProperty( sal_Int32 nPropId, Type&& rValue )
+    {
+        if( nPropId < 0 )
+            return false;
+
+        maProperties[ nPropId ] <<= std::forward<Type>(rValue);
+        return true;
+    }
+
+    /** setAnyProperty should be used */
+    bool                setProperty( sal_Int32, const css::uno::Any& ) = delete;
+
+    css::uno::Any       getProperty( sal_Int32 nPropId );
+
+    void                erase( sal_Int32 nPropId );
+
+    bool                empty() const;
+
+    /** Inserts all properties contained in the passed property map. */
+    void                assignUsed( const PropertyMap& rPropMap );
+
+    /** Inserts all properties contained in the passed property map */
+    void                assignAll( const PropertyMap& rPropMap );
+
+    /** Returns a sequence of property values, filled with all contained properties. */
+    css::uno::Sequence< css::beans::PropertyValue >
+                        makePropertyValueSequence() const;
+
+    /** Fills the passed sequences of names and anys with all contained properties. */
+    void                fillSequences(
+                            css::uno::Sequence< OUString >& rNames,
+                            css::uno::Sequence< css::uno::Any >& rValues ) const;
+
+    void                fillPropertyNameMap(PropertyNameMap& rMap) const;
+
+    /** Creates a property set supporting the XPropertySet interface and inserts all properties. */
+    css::uno::Reference< css::beans::XPropertySet >
+                        makePropertySet() const;
+
+#if OSL_DEBUG_LEVEL > 0
+#ifdef DBG_UTIL
+  static void dump( const css::uno::Reference< css::beans::XPropertySet >& rXPropSet);
+#endif
+  static void dumpCode( const css::uno::Reference< css::beans::XPropertySet >& rXPropSet);
+  static void dumpData( const css::uno::Reference<css::beans::XPropertySet>& rXPropSet);
+#endif
+private:
+    const std::vector<OUString>* mpPropNames;
+    std::map< sal_Int32, css::uno::Any > maProperties;
+};
+
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/oox/helper/propertyset.hxx b/include/oox/helper/propertyset.hxx
new file mode 100644
index 0000000000..676ec4cebf
--- /dev/null
+++ b/include/oox/helper/propertyset.hxx
@@ -0,0 +1,151 @@
+/* -*- 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_OOX_HELPER_PROPERTYSET_HXX
+#define INCLUDED_OOX_HELPER_PROPERTYSET_HXX
+
+#include <com/sun/star/uno/Any.hxx>
+#include <com/sun/star/uno/Reference.hxx>
+#include <com/sun/star/uno/Sequence.hxx>
+#include <oox/dllapi.h>
+#include <rtl/ustring.hxx>
+#include <sal/types.h>
+#include <tools/color.hxx>
+
+namespace com::sun::star {
+    namespace beans { class XMultiPropertySet; }
+    namespace beans { class XPropertySet; }
+    namespace beans { class XPropertySetInfo; }
+}
+
+namespace oox {
+
+class PropertyMap;
+
+
+/** A wrapper for a UNO property set.
+
+    This class provides functions to silently get and set properties (without
+    exceptions, without the need to check validity of the UNO property set).
+
+    An instance is constructed with the reference to a UNO property set or any
+    other interface (the constructor will query for the
+    com.sun.star.beans.XPropertySet interface then). The reference to the
+    property set will be kept as long as the instance of this class is alive.
+
+    The functions setProperties() tries to handle all passed values at once,
+    using the com.sun.star.beans.XMultiPropertySet interface.  If the
+    implementation does not support the XMultiPropertySet interface, all
+    properties are handled separately in a loop.
+ */
+class OOX_DLLPUBLIC PropertySet
+{
+public:
+    PropertySet() {}
+
+    /** Constructs a property set wrapper with the passed UNO property set. */
+    explicit     PropertySet(
+                            const css::uno::Reference< css::beans::XPropertySet >& rxPropSet )
+                                { set( rxPropSet ); }
+
+    /** Constructs a property set wrapper after querying the XPropertySet interface. */
+    template< typename Type >
+    explicit     PropertySet( const Type& rObject ) { set( rObject ); }
+
+    /** Sets the passed UNO property set and releases the old UNO property set. */
+    void                set( const css::uno::Reference< css::beans::XPropertySet >& rxPropSet );
+
+    /** Queries the passed object (interface or any) for an XPropertySet and releases the old UNO property set. */
+    template< typename Type >
+    void         set( const Type& rObject )
+                            { set( css::uno::Reference< css::beans::XPropertySet >( rObject, css::uno::UNO_QUERY ) ); }
+
+    /** Returns true, if the contained XPropertySet interface is valid. */
+    bool         is() const { return mxPropSet.is(); }
+
+    /** Returns true, if the specified property is supported by the property set. */
+    bool                hasProperty( sal_Int32 nPropId ) const;
+
+    // Get properties ---------------------------------------------------------
+
+    /** Gets the specified property from the property set.
+        @return  the property value, or an empty Any, if the property is missing. */
+    css::uno::Any getAnyProperty( sal_Int32 nPropId ) const;
+
+    /** Gets the specified property from the property set.
+        @return  true, if the passed variable could be filled with the property value. */
+    template< typename Type >
+    bool         getProperty( Type& orValue, sal_Int32 nPropId ) const
+                            { return getAnyProperty( nPropId ) >>= orValue; }
+
+    /** Gets the specified boolean property from the property set.
+        @return  true = property contains true; false = property contains false or error occurred. */
+    bool         getBoolProperty( sal_Int32 nPropId ) const
+                            { bool bValue = false; return getProperty( bValue, nPropId ) && bValue; }
+    // Set properties ---------------------------------------------------------
+
+    /** Puts the passed any into the property set. */
+    bool                setAnyProperty( sal_Int32 nPropId, const css::uno::Any& rValue );
+
+    /** Puts the passed value into the property set. */
+    template< typename Type >
+    bool         setProperty( sal_Int32 nPropId, const Type& rValue )
+                            { return setAnyProperty( nPropId, css::uno::Any( rValue ) ); }
+    bool         setProperty( sal_Int32 nPropId, ::Color rValue )
+                            { return setAnyProperty( nPropId, css::uno::Any( rValue ) ); }
+
+    /** Puts the passed properties into the property set. Tries to use the XMultiPropertySet interface.
+        @param rPropNames  The property names. MUST be ordered alphabetically.
+        @param rValues  The related property values. */
+    void                setProperties(
+                            const css::uno::Sequence< OUString >& rPropNames,
+                            const css::uno::Sequence< css::uno::Any >& rValues );
+
+    /** Puts the passed property map into the property set. Tries to use the XMultiPropertySet interface.
+        @param rPropertyMap  The property map. */
+    void                setProperties( const PropertyMap& rPropertyMap );
+
+#ifdef DBG_UTIL
+    void dump();
+#endif
+
+
+private:
+    /** Gets the specified property from the property set.
+        @return  true, if the any could be filled with the property value. */
+    bool                implGetPropertyValue( css::uno::Any& orValue, const OUString& rPropName ) const;
+
+    /** Puts the passed any into the property set. */
+    bool                implSetPropertyValue( const OUString& rPropName, const css::uno::Any& rValue );
+
+private:
+    css::uno::Reference< css::beans::XPropertySet >
+                        mxPropSet;          ///< The mandatory property set interface.
+    css::uno::Reference< css::beans::XMultiPropertySet >
+                        mxMultiPropSet;     ///< The optional multi property set interface.
+    css::uno::Reference< css::beans::XPropertySetInfo >
+                        mxPropSetInfo;      ///< Property information.
+};
+
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/oox/helper/refmap.hxx b/include/oox/helper/refmap.hxx
new file mode 100644
index 0000000000..db7cbffe2e
--- /dev/null
+++ b/include/oox/helper/refmap.hxx
@@ -0,0 +1,144 @@
+/* -*- 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_OOX_HELPER_REFMAP_HXX
+#define INCLUDED_OOX_HELPER_REFMAP_HXX
+
+#include <algorithm>
+#include <functional>
+#include <map>
+#include <memory>
+
+namespace oox {
+
+
+/** Template for a map of ref-counted objects with additional accessor functions.
+
+    An instance of the class RefMap< Type > stores elements of the type
+    std::shared_ptr< Type >. The new accessor functions has() and get()
+    work correctly for nonexisting keys, there is no need to check the passed
+    key before.
+ */
+template< typename KeyType, typename ObjType, typename CompType = std::less< KeyType > >
+class RefMap : public std::map< KeyType, std::shared_ptr< ObjType >, CompType >
+{
+public:
+    typedef std::map< KeyType, std::shared_ptr< ObjType >, CompType > container_type;
+    typedef typename container_type::key_type                               key_type;
+    typedef typename container_type::mapped_type                            mapped_type;
+    typedef typename container_type::value_type                             value_type;
+    typedef typename container_type::key_compare                            key_compare;
+
+public:
+    /** Returns true, if the object associated to the passed key exists.
+        Returns false, if the key exists but points to an empty reference. */
+    bool                has( key_type nKey ) const
+                        {
+                            const mapped_type* pxRef = getRef( nKey );
+                            return pxRef && pxRef->get();
+                        }
+
+    /** Returns a reference to the object associated to the passed key, or an
+        empty reference on error. */
+    mapped_type         get( key_type nKey ) const
+                        {
+                            if( const mapped_type* pxRef = getRef( nKey ) ) return *pxRef;
+                            return mapped_type();
+                        }
+
+    /** Calls the passed functor for every contained object, automatically
+        skips all elements that are empty references. */
+    template< typename FunctorType >
+    void                forEach( const FunctorType& rFunctor ) const
+                        {
+                            std::for_each( this->begin(), this->end(), ForEachFunctor< FunctorType >( rFunctor ) );
+                        }
+
+    /** Calls the passed member function of ObjType on every contained object,
+        automatically skips all elements that are empty references. */
+    template< typename FuncType >
+    void                forEachMem( FuncType pFunc ) const
+                        {
+                            forEach( ::std::bind( pFunc, std::placeholders::_1 ) );
+                        }
+
+    /** Calls the passed member function of ObjType on every contained object,
+        automatically skips all elements that are empty references. */
+    template< typename FuncType, typename ParamType1, typename ParamType2 >
+    void                forEachMem( FuncType pFunc, ParamType1 aParam1, ParamType2 aParam2 ) const
+                        {
+                            forEach( ::std::bind( pFunc, std::placeholders::_1, aParam1, aParam2 ) );
+                        }
+
+    /** Calls the passed member function of ObjType on every contained object,
+        automatically skips all elements that are empty references. */
+    template< typename FuncType, typename ParamType1, typename ParamType2, typename ParamType3 >
+    void                forEachMem( FuncType pFunc, ParamType1 aParam1, ParamType2 aParam2, ParamType3 aParam3 ) const
+                        {
+                            forEach( ::std::bind( pFunc, std::placeholders::_1, aParam1, aParam2, aParam3 ) );
+                        }
+
+
+    /** Calls the passed functor for every contained object. Passes the key as
+        first argument and the object reference as second argument to rFunctor. */
+    template< typename FunctorType >
+    void                forEachWithKey( const FunctorType& rFunctor ) const
+                        {
+                            std::for_each( this->begin(), this->end(), ForEachFunctorWithKey< FunctorType >( rFunctor ) );
+                        }
+
+    /** Calls the passed member function of ObjType on every contained object.
+        Passes the object key as argument to the member function. */
+    template< typename FuncType >
+    void                forEachMemWithKey( FuncType pFunc ) const
+                        {
+                            forEachWithKey( ::std::bind( pFunc, std::placeholders::_2, std::placeholders::_1 ) );
+                        }
+
+
+private:
+    template< typename FunctorType >
+    struct ForEachFunctor
+    {
+        FunctorType         maFunctor;
+        explicit     ForEachFunctor( FunctorType aFunctor ) : maFunctor(std::move( aFunctor )) {}
+        void         operator()( const value_type& rValue ) { if( rValue.second.get() ) maFunctor( *rValue.second ); }
+    };
+
+    template< typename FunctorType >
+    struct ForEachFunctorWithKey
+    {
+        FunctorType         maFunctor;
+        explicit     ForEachFunctorWithKey( FunctorType aFunctor ) : maFunctor(std::move( aFunctor )) {}
+        void         operator()( const value_type& rValue ) { if( rValue.second.get() ) maFunctor( rValue.first, *rValue.second ); }
+    };
+
+    const mapped_type* getRef( key_type nKey ) const
+    {
+        typename container_type::const_iterator aIt = this->find( nKey );
+        return (aIt == this->end()) ? nullptr : &aIt->second;
+    }
+};
+
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/oox/helper/refvector.hxx b/include/oox/helper/refvector.hxx
new file mode 100644
index 0000000000..8e60c20798
--- /dev/null
+++ b/include/oox/helper/refvector.hxx
@@ -0,0 +1,163 @@
+/* -*- 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_OOX_HELPER_REFVECTOR_HXX
+#define INCLUDED_OOX_HELPER_REFVECTOR_HXX
+
+#include <algorithm>
+#include <functional>
+#include <memory>
+#include <vector>
+
+#include <sal/types.h>
+
+namespace oox {
+
+
+/** Template for a vector of ref-counted objects with additional accessor functions.
+
+    An instance of the class RefVector< Type > stores elements of the type
+    std::shared_ptr< Type >. The new accessor functions has() and get()
+    work correctly for indexes out of the current range, there is no need to
+    check the passed index before.
+ */
+template< typename ObjType >
+class RefVector : public ::std::vector< std::shared_ptr< ObjType > >
+{
+public:
+    typedef ::std::vector< std::shared_ptr< ObjType > > container_type;
+    typedef typename container_type::value_type             value_type;
+    typedef typename container_type::size_type              size_type;
+
+public:
+
+    /** Returns a reference to the object with the passed index, or 0 on error. */
+    value_type          get( sal_Int32 nIndex ) const
+                        {
+                            if( const value_type* pxRef = getRef( nIndex ) ) return *pxRef;
+                            return value_type();
+                        }
+
+    /** Calls the passed functor for every contained object, automatically
+        skips all elements that are empty references. */
+    template< typename FunctorType >
+    void                forEach( FunctorType aFunctor ) const
+                        {
+                            ::std::for_each( this->begin(), this->end(), ForEachFunctor< FunctorType >( aFunctor ) );
+                        }
+
+    /** Calls the passed member function of ObjType on every contained object,
+        automatically skips all elements that are empty references. */
+    template< typename FuncType >
+    void                forEachMem( FuncType pFunc ) const
+                        {
+                            forEach( ::std::bind( pFunc, std::placeholders::_1 ) );
+                        }
+
+    /** Calls the passed member function of ObjType on every contained object,
+        automatically skips all elements that are empty references. */
+    template< typename FuncType, typename ParamType >
+    void                forEachMem( FuncType pFunc, ParamType aParam ) const
+                        {
+                            forEach( ::std::bind( pFunc, std::placeholders::_1, aParam ) );
+                        }
+
+    /** Calls the passed member function of ObjType on every contained object,
+        automatically skips all elements that are empty references. */
+    template< typename FuncType, typename ParamType1, typename ParamType2 >
+    void                forEachMem( FuncType pFunc, ParamType1 aParam1, ParamType2 aParam2 ) const
+                        {
+                            forEach( ::std::bind( pFunc, std::placeholders::_1, aParam1, aParam2 ) );
+                        }
+
+    /** Calls the passed member function of ObjType on every contained object,
+        automatically skips all elements that are empty references. */
+    template< typename FuncType, typename ParamType1, typename ParamType2, typename ParamType3 >
+    void                forEachMem( FuncType pFunc, ParamType1 aParam1, ParamType2 aParam2, ParamType3 aParam3 ) const
+                        {
+                            forEach( ::std::bind( pFunc, std::placeholders::_1, aParam1, aParam2, aParam3 ) );
+                        }
+
+    /** Calls the passed functor for every contained object. Passes the index as
+        first argument and the object reference as second argument to rFunctor. */
+    template< typename FunctorType >
+    void                forEachWithIndex( const FunctorType& rFunctor ) const
+                        {
+                            ::std::for_each( this->begin(), this->end(), ForEachFunctorWithIndex< FunctorType >( rFunctor ) );
+                        }
+
+    /** Calls the passed member function of ObjType on every contained object.
+        Passes the vector index as first argument to the member function. */
+    template< typename FuncType, typename ParamType1, typename ParamType2 >
+    void                forEachMemWithIndex( FuncType pFunc, ParamType1 aParam1, ParamType2 aParam2 ) const
+                        {
+                            forEachWithIndex( ::std::bind( pFunc, std::placeholders::_2, std::placeholders::_1, aParam1, aParam2 ) );
+                        }
+
+    /** Searches for an element by using the passed functor that takes a
+        constant reference of the object type (const ObjType&). */
+    template< typename FunctorType >
+    value_type          findIf( const FunctorType& rFunctor ) const
+                        {
+                            typename container_type::const_iterator aIt = ::std::find_if( this->begin(), this->end(), FindFunctor< FunctorType >( rFunctor ) );
+                            return (aIt == this->end()) ? value_type() : *aIt;
+                        }
+
+private:
+    template< typename FunctorType >
+    struct ForEachFunctor
+    {
+        FunctorType         maFunctor;
+        explicit            ForEachFunctor( FunctorType aFunctor ) : maFunctor(std::move( aFunctor )) {}
+        void                operator()( const value_type& rxValue ) { if( rxValue.get() ) maFunctor( *rxValue ); }
+    };
+
+    template< typename FunctorType >
+    struct ForEachFunctorWithIndex
+    {
+        FunctorType         maFunctor;
+        sal_Int32           mnIndex;
+        explicit            ForEachFunctorWithIndex( FunctorType aFunctor ) : maFunctor(std::move( aFunctor )), mnIndex( 0 ) {}
+        void                operator()( const value_type& rxValue ) {
+            if( rxValue.get() ) maFunctor( mnIndex, *rxValue );
+            ++mnIndex;
+        }
+    };
+
+    template< typename FunctorType >
+    struct FindFunctor
+    {
+        FunctorType         maFunctor;
+        explicit            FindFunctor( const FunctorType& rFunctor ) : maFunctor( rFunctor ) {}
+        bool                operator()( const value_type& rxValue ) { return rxValue.get() && maFunctor( *rxValue ); }
+    };
+
+    const value_type*   getRef( sal_Int32 nIndex ) const
+                        {
+                            return ((0 <= nIndex) && (static_cast< size_type >( nIndex ) < this->size())) ?
+                                &(*this)[ static_cast< size_type >( nIndex ) ] : nullptr;
+                        }
+};
+
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/oox/helper/storagebase.hxx b/include/oox/helper/storagebase.hxx
new file mode 100644
index 0000000000..b21bb3bb32
--- /dev/null
+++ b/include/oox/helper/storagebase.hxx
@@ -0,0 +1,192 @@
+/* -*- 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_OOX_HELPER_STORAGEBASE_HXX
+#define INCLUDED_OOX_HELPER_STORAGEBASE_HXX
+
+#include <functional>
+#include <memory>
+#include <vector>
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <oox/dllapi.h>
+#include <oox/helper/refmap.hxx>
+#include <rtl/ustring.hxx>
+
+namespace com::sun::star {
+    namespace embed { class XStorage; }
+    namespace io { class XInputStream; }
+    namespace io { class XOutputStream; }
+    namespace io { class XStream; }
+}
+
+namespace oox {
+
+
+class StorageBase;
+typedef std::shared_ptr< StorageBase > StorageRef;
+
+/** Base class for storage access implementations.
+
+    Derived classes will be used to encapsulate storage access implementations
+    for ZIP storages containing XML streams, and OLE storages containing binary
+    data streams.
+ */
+class OOX_DLLPUBLIC StorageBase
+{
+public:
+    explicit            StorageBase(
+                            const css::uno::Reference< css::io::XInputStream >& rxInStream,
+                            bool bBaseStreamAccess );
+
+    explicit            StorageBase(
+                            const css::uno::Reference< css::io::XStream >& rxOutStream,
+                            bool bBaseStreamAccess );
+
+    virtual             ~StorageBase();
+
+    /** Returns true, if the object represents a valid storage. */
+    bool                isStorage() const;
+
+    /** Returns true, if the object represents the root storage. */
+    bool                isRootStorage() const;
+
+    /** Returns true, if the storage operates in read-only mode (based on an
+        input stream). */
+    bool                isReadOnly() const { return mbReadOnly;}
+
+    /** Returns the com.sun.star.embed.XStorage interface of the current storage. */
+    css::uno::Reference< css::embed::XStorage >
+                        getXStorage() const;
+
+    /** Returns the element name of this storage. */
+    const OUString& getName() const { return maStorageName;}
+
+    /** Returns the full path of this storage. */
+    OUString     getPath() const;
+
+    /** Fills the passed vector with the names of all direct elements of this
+        storage. */
+    void                getElementNames( ::std::vector< OUString >& orElementNames ) const;
+
+    /** Opens and returns the specified sub storage from the storage.
+
+        @param rStorageName
+            The name of the embedded storage. The name may contain slashes to
+            open storages from embedded substorages.
+        @param bCreateMissing
+            True = create missing sub storages (for export filters). Must be
+            false for storages based on input streams.
+     */
+    StorageRef          openSubStorage( const OUString& rStorageName, bool bCreateMissing );
+
+    /** Opens and returns the specified input stream from the storage.
+
+        @param rStreamName
+            The name of the embedded storage stream. The name may contain
+            slashes to open streams from embedded substorages. If base stream
+            access has been enabled in the constructor, the base stream can be
+            accessed by passing an empty string as stream name.
+     */
+    css::uno::Reference< css::io::XInputStream >
+                        openInputStream( const OUString& rStreamName );
+
+    /** Opens and returns the specified output stream from the storage.
+
+        @param rStreamName
+            The name of the embedded storage stream. The name may contain
+            slashes to create and open streams in embedded substorages. If base
+            stream access has been enabled in the constructor, the base stream
+            can be accessed by passing an empty string as stream name.
+     */
+    css::uno::Reference< css::io::XOutputStream >
+                        openOutputStream( const OUString& rStreamName );
+
+    /** Copies the specified element from this storage to the passed
+         destination storage.
+
+        @param rElementName
+            The name of the embedded storage or stream. The name may contain
+            slashes to specify an element in an embedded substorage. In this
+            case, the element will be copied to the same substorage in the
+            destination storage.
+     */
+    void                copyToStorage( StorageBase& rDestStrg, const OUString& rElementName );
+
+    /** Copies all streams of this storage and of all substorages to the passed
+        destination. */
+    void                copyStorageToStorage( StorageBase& rDestStrg );
+
+    /** Commits the changes to the storage and all substorages. */
+    void                commit();
+
+protected:
+    /** Special constructor for sub storage objects. */
+    explicit            StorageBase( const StorageBase& rParentStorage, OUString aStorageName, bool bReadOnly );
+
+private:
+                        StorageBase( const StorageBase& ) = delete;
+    StorageBase&        operator=( const StorageBase& ) = delete;
+
+    /** Returns true, if the object represents a valid storage. */
+    virtual bool        implIsStorage() const = 0;
+
+    /** Returns the com.sun.star.embed.XStorage interface of the current storage. */
+    virtual css::uno::Reference< css::embed::XStorage >
+                        implGetXStorage() const = 0;
+
+    /** Returns the names of all elements of this storage. */
+    virtual void        implGetElementNames( ::std::vector< OUString >& orElementNames ) const = 0;
+
+    /** Implementation of opening a storage element. */
+    virtual StorageRef  implOpenSubStorage( const OUString& rElementName, bool bCreate ) = 0;
+
+    /** Implementation of opening an input stream element. */
+    virtual css::uno::Reference< css::io::XInputStream >
+                        implOpenInputStream( const OUString& rElementName ) = 0;
+
+    /** Implementation of opening an output stream element. */
+    virtual css::uno::Reference< css::io::XOutputStream >
+                        implOpenOutputStream( const OUString& rElementName ) = 0;
+
+    /** Commits the current storage. */
+    virtual void        implCommit() const = 0;
+
+    /** Helper that opens and caches the specified direct substorage. */
+    StorageRef          getSubStorage( const OUString& rElementName, bool bCreateMissing );
+
+private:
+    RefMap< OUString, StorageBase >
+                        maSubStorages;      ///< Map of direct sub storages.
+    css::uno::Reference< css::io::XInputStream >
+                        mxInStream;         ///< Cached base input stream (to keep it alive).
+    css::uno::Reference< css::io::XStream >
+                        mxOutStream;        ///< Cached base output stream (to keep it alive).
+    OUString            maParentPath;       ///< Full path of parent storage.
+    OUString            maStorageName;      ///< Name of this storage, if it is a substorage.
+    bool                mbBaseStreamAccess; ///< True = access base streams with empty stream name.
+    bool                mbReadOnly;         ///< True = storage opened read-only (based on input stream).
+};
+
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/oox/helper/textinputstream.hxx b/include/oox/helper/textinputstream.hxx
new file mode 100644
index 0000000000..4a5bcdbfe9
--- /dev/null
+++ b/include/oox/helper/textinputstream.hxx
@@ -0,0 +1,121 @@
+/* -*- 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_OOX_HELPER_TEXTINPUTSTREAM_HXX
+#define INCLUDED_OOX_HELPER_TEXTINPUTSTREAM_HXX
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <rtl/textenc.h>
+#include <rtl/ustring.hxx>
+#include <sal/types.h>
+
+namespace com::sun::star {
+    namespace io { class XInputStream; }
+    namespace io { class XTextInputStream2; }
+    namespace uno { class XComponentContext; }
+}
+
+namespace oox {
+
+class BinaryInputStream;
+
+
+class TextInputStream
+{
+public:
+    explicit            TextInputStream(
+                            const css::uno::Reference< css::uno::XComponentContext >& rxContext,
+                            const css::uno::Reference< css::io::XInputStream >& rxInStrm,
+                            rtl_TextEncoding eTextEnc );
+
+    explicit            TextInputStream(
+                            const css::uno::Reference< css::uno::XComponentContext >& rxContext,
+                            BinaryInputStream& rInStrm,
+                            rtl_TextEncoding eTextEnc );
+
+                        ~TextInputStream();
+
+    /** Returns true, if no more text is available in the stream.
+     */
+    bool                isEof() const;
+
+    /** Reads a text line from the stream.
+
+        If the last line in the stream is not terminated with line-end
+        character(s), the stream will immediately go into EOF state and return
+        the text line. Otherwise, if the last character in the stream is a
+        line-end character, the next call to this function will turn the stream
+        into EOF state and return an empty string.
+     */
+    OUString     readLine();
+
+    /** Reads a text portion from the stream until the specified character is
+        found.
+
+        If the end of the stream is not terminated with the specified
+        character, the stream will immediately go into EOF state and return the
+        remaining text portion. Otherwise, if the last character in the stream
+        is the specified character (and caller specifies to read and return it,
+        see parameter bIncludeChar), the next call to this function will turn
+        the stream into EOF state and return an empty string.
+
+        @param cChar
+            The separator character to be read to.
+
+        @param bIncludeChar
+            True = if found, the specified character will be read from stream
+                and included in the returned string.
+            False = the specified character will neither be read from the
+                stream nor included in the returned string, but will be
+                returned as first character in the next call of this function
+                or readLine().
+     */
+    OUString     readToChar( sal_Unicode cChar, bool bIncludeChar );
+
+
+    /** Creates a UNO text input stream object from the passed UNO input stream.
+     */
+    static css::uno::Reference< css::io::XTextInputStream2 >
+                        createXTextInputStream(
+                            const css::uno::Reference< css::uno::XComponentContext >& rxContext,
+                            const css::uno::Reference< css::io::XInputStream >& rxInStrm,
+                            rtl_TextEncoding eTextEnc );
+
+
+private:
+    void                init(
+                            const css::uno::Reference< css::uno::XComponentContext >& rxContext,
+                            const css::uno::Reference< css::io::XInputStream >& rxInStrm,
+                            rtl_TextEncoding eTextEnc );
+
+    /** Adds the pending character in front of the passed string, if existing. */
+    OUString     createFinalString( const OUString& rString );
+
+private:
+    css::uno::Reference< css::io::XTextInputStream2 >
+                        mxTextStrm;
+    sal_Unicode         mcPendingChar;
+};
+
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/oox/helper/zipstorage.hxx b/include/oox/helper/zipstorage.hxx
new file mode 100644
index 0000000000..dd56a1f75a
--- /dev/null
+++ b/include/oox/helper/zipstorage.hxx
@@ -0,0 +1,95 @@
+/* -*- 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_OOX_HELPER_ZIPSTORAGE_HXX
+#define INCLUDED_OOX_HELPER_ZIPSTORAGE_HXX
+
+#include <vector>
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <oox/helper/storagebase.hxx>
+#include <rtl/ustring.hxx>
+
+namespace com::sun::star {
+    namespace embed { class XStorage; }
+    namespace io { class XInputStream; }
+    namespace io { class XOutputStream; }
+    namespace io { class XStream; }
+    namespace uno { class XComponentContext; }
+}
+
+namespace oox {
+
+
+/** Implements stream access for ZIP storages containing XML streams. */
+class ZipStorage final : public StorageBase
+{
+public:
+    explicit            ZipStorage(
+                            const css::uno::Reference< css::uno::XComponentContext >& rxContext,
+                            const css::uno::Reference< css::io::XInputStream >& rxInStream,
+                            bool bRepairStorage );
+
+    explicit            ZipStorage(
+                            const css::uno::Reference< css::uno::XComponentContext >& rxContext,
+                            const css::uno::Reference< css::io::XStream >& rxStream );
+
+    virtual             ~ZipStorage() override;
+
+private:
+    explicit            ZipStorage(
+                            const ZipStorage& rParentStorage,
+                            const css::uno::Reference< css::embed::XStorage >& rxStorage,
+                            const OUString& rElementName );
+
+    /** Returns true, if the object represents a valid storage. */
+    virtual bool        implIsStorage() const override;
+
+    /** Returns the com.sun.star.embed.XStorage interface of the current storage. */
+    virtual css::uno::Reference< css::embed::XStorage >
+                        implGetXStorage() const override;
+
+    /** Returns the names of all elements of this storage. */
+    virtual void        implGetElementNames( ::std::vector< OUString >& orElementNames ) const override;
+
+    /** Opens and returns the specified sub storage from the storage. */
+    virtual StorageRef  implOpenSubStorage( const OUString& rElementName, bool bCreateMissing ) override;
+
+    /** Opens and returns the specified input stream from the storage. */
+    virtual css::uno::Reference< css::io::XInputStream >
+                        implOpenInputStream( const OUString& rElementName ) override;
+
+    /** Opens and returns the specified output stream from the storage. */
+    virtual css::uno::Reference< css::io::XOutputStream >
+                        implOpenOutputStream( const OUString& rElementName ) override;
+
+    /** Commits the current storage. */
+    virtual void        implCommit() const override;
+
+private:
+    css::uno::Reference< css::embed::XStorage >
+                        mxStorage;      ///< Storage based on input or output stream.
+};
+
+
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */