pdfwriter_impl.cxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include <config_features.h>

#include <sal/types.h>

#include <math.h>
#include <algorithm>

#include <lcms2.h>

#include <basegfx/matrix/b2dhommatrix.hxx>
#include <basegfx/polygon/b2dpolygon.hxx>
#include <basegfx/polygon/b2dpolygontools.hxx>
#include <basegfx/polygon/b2dpolypolygon.hxx>
#include <basegfx/polygon/b2dpolypolygoncutter.hxx>
#include <basegfx/polygon/b2dpolypolygontools.hxx>
#include <memory>
#include <com/sun/star/io/XOutputStream.hpp>
#include <com/sun/star/util/URL.hpp>
#include <com/sun/star/util/URLTransformer.hpp>
#include <comphelper/processfactory.hxx>
#include <comphelper/string.hxx>
#include <cppuhelper/implbase.hxx>
#include <i18nlangtag/languagetag.hxx>
#include <o3tl/numeric.hxx>
#include <osl/file.hxx>
#include <osl/thread.h>
#include <rtl/digest.h>
#include <rtl/ustrbuf.hxx>
#include <sal/log.hxx>
#include <svl/urihelper.hxx>
#include <tools/fract.hxx>
#include <tools/helpers.hxx>
#include <tools/stream.hxx>
#include <tools/urlobj.hxx>
#include <tools/zcodec.hxx>
#include <svl/cryptosign.hxx>
#include <vcl/bitmapex.hxx>
#include <vcl/bitmapaccess.hxx>
#include <vcl/canvastools.hxx>
#include <vcl/cvtgrf.hxx>
#include <vcl/fontcharmap.hxx>
#include <vcl/lineinfo.hxx>
#include <vcl/metric.hxx>
#include <vcl/settings.hxx>
#include <vcl/strhelper.hxx>
#include <vcl/svapp.hxx>
#include <vcl/virdev.hxx>
#include <vcl/filter/pdfdocument.hxx>
#include <comphelper/hash.hxx>

#include <fontsubset.hxx>
#include <PhysicalFontFace.hxx>
#include <salgdi.hxx>
#include <textlayout.hxx>
#include <textlineinfo.hxx>
#include <bitmapwriteaccess.hxx>
#include <impglyphitem.hxx>
#include <pdf/XmpMetadata.hxx>

#include "pdfwriter_impl.hxx"

#ifdef _WIN32
// WinCrypt headers for PDF signing
// Note: this uses Windows 7 APIs and requires the relevant data types
#include <prewin.h>
#include <wincrypt.h>
#include <postwin.h>
#endif

#include <config_eot.h>

#if ENABLE_EOT
#include <libeot/libeot.h>
#endif

using namespace vcl;
using namespace::com::sun::star;

static bool g_bDebugDisableCompression = getenv("VCL_DEBUG_DISABLE_PDFCOMPRESSION");

#if HAVE_FEATURE_NSS
// Is this length truly the maximum possible, or just a number that
// seemed large enough when the author tested this (with some type of
// certificates)? I suspect the latter.

// Used to be 0x4000 = 16384, but a sample signed PDF (produced by
// some other software) provided by the customer has a signature
// content that is 30000 bytes. The SampleSignedPDFDocument.pdf from
// Adobe has one that is 21942 bytes. So let's be careful. Pity this
// can't be dynamic, at least not without restructuring the code. Also
// note that the checks in the code for this being too small
// apparently are broken, if this overflows you end up with an invalid
// PDF. Need to fix that.

#define MAX_SIGNATURE_CONTENT_LENGTH 50000
#endif

static const sal_Int32 nLog10Divisor = 3;
static const double fDivisor = 1000.0;

static double pixelToPoint( double px ) { return px/fDivisor; }
static sal_Int32 pointToPixel( double pt ) { return sal_Int32(pt*fDivisor); }

const sal_uInt8 PDFWriterImpl::s_nPadString[32] =
{
    0x28, 0xBF, 0x4E, 0x5E, 0x4E, 0x75, 0x8A, 0x41, 0x64, 0x00, 0x4E, 0x56, 0xFF, 0xFA, 0x01, 0x08,
    0x2E, 0x2E, 0x00, 0xB6, 0xD0, 0x68, 0x3E, 0x80, 0x2F, 0x0C, 0xA9, 0xFE, 0x64, 0x53, 0x69, 0x7A
};

static void appendHex( sal_Int8 nInt, OStringBuffer& rBuffer )
{
    static const char pHexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7',
                                           '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
    rBuffer.append( pHexDigits[ (nInt >> 4) & 15 ] );
    rBuffer.append( pHexDigits[ nInt & 15 ] );
}

static void appendName( const OUString& rStr, OStringBuffer& rBuffer )
{
// FIXME i59651 add a check for max length of 127 chars? Per PDF spec 1.4, appendix C.1
// I guess than when reading the #xx sequence it will count for a single character.
    OString aStr( OUStringToOString( rStr, RTL_TEXTENCODING_UTF8 ) );
    int nLen = aStr.getLength();
    for( int i = 0; i < nLen; i++ )
    {
        /*  #i16920# PDF recommendation: output UTF8, any byte
         *  outside the interval [33(=ASCII'!');126(=ASCII'~')]
         *  should be escaped hexadecimal
         *  for the sake of ghostscript which also reads PDF
         *  but has a narrower acceptance rate we only pass
         *  alphanumerics and '-' literally.
         */
        if( (aStr[i] >= 'A' && aStr[i] <= 'Z' ) ||
            (aStr[i] >= 'a' && aStr[i] <= 'z' ) ||
            (aStr[i] >= '0' && aStr[i] <= '9' ) ||
            aStr[i] == '-' )
        {
            rBuffer.append( aStr[i] );
        }
        else
        {
            rBuffer.append( '#' );
            appendHex( static_cast<sal_Int8>(aStr[i]), rBuffer );
        }
    }
}

static void appendName( const char* pStr, OStringBuffer& rBuffer )
{
    // FIXME i59651 see above
    while( pStr && *pStr )
    {
        if( (*pStr >= 'A' && *pStr <= 'Z' ) ||
            (*pStr >= 'a' && *pStr <= 'z' ) ||
            (*pStr >= '0' && *pStr <= '9' ) ||
            *pStr == '-' )
        {
            rBuffer.append( *pStr );
        }
        else
        {
            rBuffer.append( '#' );
            appendHex( static_cast<sal_Int8>(*pStr), rBuffer );
        }
        pStr++;
    }
}

//used only to emit encoded passwords
static void appendLiteralString( const char* pStr, sal_Int32 nLength, OStringBuffer& rBuffer )
{
    while( nLength )
    {
        switch( *pStr )
        {
        case '\n' :
            rBuffer.append( "\\n" );
            break;
        case '\r' :
            rBuffer.append( "\\r" );
            break;
        case '\t' :
            rBuffer.append( "\\t" );
            break;
        case '\b' :
            rBuffer.append( "\\b" );
            break;
        case '\f' :
            rBuffer.append( "\\f" );
            break;
        case '(' :
        case ')' :
        case '\\' :
            rBuffer.append( "\\" );
            rBuffer.append( static_cast<char>(*pStr) );
            break;
        default:
            rBuffer.append( static_cast<char>(*pStr) );
            break;
        }
        pStr++;
        nLength--;
    }
}

/*
 * Convert a string before using it.
 *
 * This string conversion function is needed because the destination name
 * in a PDF file seen through an Internet browser should be
 * specially crafted, in order to be used directly by the browser.
 * In this way the fragment part of a hyperlink to a PDF file (e.g. something
 * as 'test1/test2/a-file.pdf\#thefragment) will be (hopefully) interpreted by the
 * PDF reader (currently only Adobe Reader plug-in seems to be working that way) called
 * from inside the Internet browser as: 'open the file test1/test2/a-file.pdf
 * and go to named destination thefragment using default zoom'.
 * The conversion is needed because in case of a fragment in the form: Slide%201
 * (meaning Slide 1) as it is converted obeying the Inet rules, it will become Slide25201
 * using this conversion, in both the generated named destinations, fragment and GoToR
 * destination.
 *
 * The names for destinations are name objects and so they don't need to be encrypted
 * even though they expose the content of PDF file (e.g. guessing the PDF content from the
 * destination name).
 *
 * Further limitation: it is advisable to use standard ASCII characters for
 * OOo bookmarks.
*/
static void appendDestinationName( const OUString& rString, OStringBuffer& rBuffer )
{
    const sal_Unicode* pStr = rString.getStr();
    sal_Int32 nLen = rString.getLength();
    for( int i = 0; i < nLen; i++ )
    {
        sal_Unicode aChar = pStr[i];
        if( (aChar >= '0' && aChar <= '9' ) ||
            (aChar >= 'a' && aChar <= 'z' ) ||
            (aChar >= 'A' && aChar <= 'Z' ) ||
            aChar == '-' )
        {
            rBuffer.append(static_cast<char>(aChar));
        }
        else
        {
            sal_Int8 aValueHigh = sal_Int8(aChar >> 8);
            if(aValueHigh > 0)
                appendHex( aValueHigh, rBuffer );
            appendHex( static_cast<sal_Int8>(aChar & 255 ), rBuffer );
        }
    }
}

void PDFWriter::AppendUnicodeTextString(const OUString& rString, OStringBuffer& rBuffer)
{
    rBuffer.append( "FEFF" );
    const sal_Unicode* pStr = rString.getStr();
    sal_Int32 nLen = rString.getLength();
    for( int i = 0; i < nLen; i++ )
    {
        sal_Unicode aChar = pStr[i];
        appendHex( static_cast<sal_Int8>(aChar >> 8), rBuffer );
        appendHex( static_cast<sal_Int8>(aChar & 255 ), rBuffer );
    }
}

void PDFWriterImpl::createWidgetFieldName( sal_Int32 i_nWidgetIndex, const PDFWriter::AnyWidget& i_rControl )
{
    /* #i80258# previously we use appendName here
       however we need a slightly different coding scheme than the normal
       name encoding for field names
    */
    const OUString& rName = (m_aContext.Version > PDFWriter::PDFVersion::PDF_1_2) ? i_rControl.Name : i_rControl.Text;
    OString aStr( OUStringToOString( rName, RTL_TEXTENCODING_UTF8 ) );
    int nLen = aStr.getLength();

    OStringBuffer aBuffer( rName.getLength()+64 );
    for( int i = 0; i < nLen; i++ )
    {
        /*  #i16920# PDF recommendation: output UTF8, any byte
         *  outside the interval [32(=ASCII' ');126(=ASCII'~')]
         *  should be escaped hexadecimal
         */
        if( aStr[i] >= 32 && aStr[i] <= 126 )
            aBuffer.append( aStr[i] );
        else
        {
            aBuffer.append( '#' );
            appendHex( static_cast<sal_Int8>(aStr[i]), aBuffer );
        }
    }

    OString aFullName( aBuffer.makeStringAndClear() );

    /* #i82785# create hierarchical fields down to the for each dot in i_rName */
    sal_Int32 nTokenIndex = 0, nLastTokenIndex = 0;
    OString aPartialName;
    OString aDomain;
    do
    {
        nLastTokenIndex = nTokenIndex;
        aPartialName = aFullName.getToken( 0, '.', nTokenIndex );
        if( nTokenIndex != -1 )
        {
            // find or create a hierarchical field
            // first find the fully qualified name up to this field
            aDomain = aFullName.copy( 0, nTokenIndex-1 );
            std::unordered_map< OString, sal_Int32 >::const_iterator it = m_aFieldNameMap.find( aDomain );
            if( it == m_aFieldNameMap.end() )
            {
                 // create new hierarchy field
                sal_Int32 nNewWidget = m_aWidgets.size();
                m_aWidgets.emplace_back( );
                m_aWidgets[nNewWidget].m_nObject = createObject();
                m_aWidgets[nNewWidget].m_eType = PDFWriter::Hierarchy;
                m_aWidgets[nNewWidget].m_aName = aPartialName;
                m_aWidgets[i_nWidgetIndex].m_nParent = m_aWidgets[nNewWidget].m_nObject;
                m_aFieldNameMap[aDomain] = nNewWidget;
                m_aWidgets[i_nWidgetIndex].m_nParent = m_aWidgets[nNewWidget].m_nObject;
                if( nLastTokenIndex > 0 )
                {
                    // this field is not a root field and
                    // needs to be inserted to its parent
                    OString aParentDomain( aDomain.copy( 0, nLastTokenIndex-1 ) );
                    it = m_aFieldNameMap.find( aParentDomain );
                    OSL_ENSURE( it != m_aFieldNameMap.end(), "field name not found" );
                    if( it != m_aFieldNameMap.end()  )
                    {
                        OSL_ENSURE( it->second < sal_Int32(m_aWidgets.size()), "invalid field number entry" );
                        if( it->second < sal_Int32(m_aWidgets.size()) )
                        {
                            PDFWidget& rParentField( m_aWidgets[it->second] );
                            rParentField.m_aKids.push_back( m_aWidgets[nNewWidget].m_nObject );
                            rParentField.m_aKidsIndex.push_back( nNewWidget );
                            m_aWidgets[nNewWidget].m_nParent = rParentField.m_nObject;
                        }
                    }
                }
            }
            else if( m_aWidgets[it->second].m_eType != PDFWriter::Hierarchy )
            {
                // this is invalid, someone tries to have a terminal field as parent
                // example: a button with the name foo.bar exists and
                // another button is named foo.bar.no
                // workaround: put the second terminal field as much up in the hierarchy as
                // necessary to have a non-terminal field as parent (or none at all)
                // since it->second already is terminal, we just need to use its parent
                aDomain.clear();
                aPartialName = aFullName.copy( aFullName.lastIndexOf( '.' )+1 );
                if( nLastTokenIndex > 0 )
                {
                    aDomain = aFullName.copy( 0, nLastTokenIndex-1 );
                    aFullName = aDomain + "." + aPartialName;
                }
                else
                    aFullName = aPartialName;
                break;
            }
        }
    } while( nTokenIndex != -1 );

    // insert widget into its hierarchy field
    if( !aDomain.isEmpty() )
    {
        std::unordered_map< OString, sal_Int32 >::const_iterator it = m_aFieldNameMap.find( aDomain );
        if( it != m_aFieldNameMap.end() )
        {
            OSL_ENSURE( it->second >= 0 && it->second < sal_Int32( m_aWidgets.size() ), "invalid field index" );
            if( it->second >= 0 && it->second < sal_Int32(m_aWidgets.size()) )
            {
                m_aWidgets[i_nWidgetIndex].m_nParent = m_aWidgets[it->second].m_nObject;
                m_aWidgets[it->second].m_aKids.push_back( m_aWidgets[i_nWidgetIndex].m_nObject);
                m_aWidgets[it->second].m_aKidsIndex.push_back( i_nWidgetIndex );
            }
        }
    }

    if( aPartialName.isEmpty() )
    {
        // how funny, an empty field name
        if( i_rControl.getType() == PDFWriter::RadioButton )
        {
            aPartialName  = "RadioGroup" +
                OString::number( static_cast<const PDFWriter::RadioButtonWidget&>(i_rControl).RadioGroup );
        }
        else
            aPartialName = OString( "Widget" );
    }

    if( ! m_aContext.AllowDuplicateFieldNames )
    {
        std::unordered_map<OString, sal_Int32>::iterator it = m_aFieldNameMap.find( aFullName );

        if( it != m_aFieldNameMap.end() ) // not unique
        {
            std::unordered_map< OString, sal_Int32 >::const_iterator check_it;
            OString aTry;
            sal_Int32 nTry = 2;
            do
            {
                OStringBuffer aUnique( aFullName.getLength() + 16 );
                aUnique.append( aFullName );
                aUnique.append( '_' );
                aUnique.append( nTry++ );
                aTry = aUnique.makeStringAndClear();
                check_it = m_aFieldNameMap.find( aTry );
            } while( check_it != m_aFieldNameMap.end() );
            aFullName = aTry;
            m_aFieldNameMap[ aFullName ] = i_nWidgetIndex;
            aPartialName = aFullName.copy( aFullName.lastIndexOf( '.' )+1 );
        }
        else
            m_aFieldNameMap[ aFullName ] = i_nWidgetIndex;
    }

    // finally
    m_aWidgets[i_nWidgetIndex].m_aName = aPartialName;
}

static void appendFixedInt( sal_Int32 nValue, OStringBuffer& rBuffer )
{
    if( nValue < 0 )
    {
        rBuffer.append( '-' );
        nValue = -nValue;
    }
    sal_Int32 nFactor = 1, nDiv = nLog10Divisor;
    while( nDiv-- )
        nFactor *= 10;

    sal_Int32 nInt = nValue / nFactor;
    rBuffer.append( nInt );
    if (nFactor > 1 && nValue % nFactor)
    {
        rBuffer.append( '.' );
        do
        {
            nFactor /= 10;
            rBuffer.append((nValue / nFactor) % 10);
        }
        while (nFactor > 1 && nValue % nFactor); // omit trailing zeros
    }
}

// appends a double. PDF does not accept exponential format, only fixed point
static void appendDouble( double fValue, OStringBuffer& rBuffer, sal_Int32 nPrecision = 5 )
{
    bool bNeg = false;
    if( fValue < 0.0 )
    {
        bNeg = true;
        fValue=-fValue;
    }

    sal_Int64 nInt = static_cast<sal_Int64>(fValue);
    fValue -= static_cast<double>(nInt);
    // optimizing hardware may lead to a value of 1.0 after the subtraction
    if( rtl::math::approxEqual(fValue, 1.0) || log10( 1.0-fValue ) <= -nPrecision )
    {
        nInt++;
        fValue = 0.0;
    }
    sal_Int64 nFrac = 0;
    if( fValue )
    {
        fValue *= pow( 10.0, static_cast<double>(nPrecision) );
        nFrac = static_cast<sal_Int64>(fValue);
    }
    if( bNeg && ( nInt || nFrac ) )
        rBuffer.append( '-' );
    rBuffer.append( nInt );
    if( nFrac )
    {
        int i;
        rBuffer.append( '.' );
        sal_Int64 nBound = static_cast<sal_Int64>(pow( 10.0, nPrecision - 1.0 )+0.5);
        for ( i = 0; ( i < nPrecision ) && nFrac; i++ )
        {
            sal_Int64 nNumb = nFrac / nBound;
            nFrac -= nNumb * nBound;
            rBuffer.append( nNumb );
            nBound /= 10;
        }
    }
}

static void appendColor( const Color& rColor, OStringBuffer& rBuffer, bool bConvertToGrey )
{

    if( rColor != COL_TRANSPARENT )
    {
        if( bConvertToGrey )
        {
            sal_uInt8 cByte = rColor.GetLuminance();
            appendDouble( static_cast<double>(cByte) / 255.0, rBuffer );
        }
        else
        {
            appendDouble( static_cast<double>(rColor.GetRed()) / 255.0, rBuffer );
            rBuffer.append( ' ' );
            appendDouble( static_cast<double>(rColor.GetGreen()) / 255.0, rBuffer );
            rBuffer.append( ' ' );
            appendDouble( static_cast<double>(rColor.GetBlue()) / 255.0, rBuffer );
        }
    }
}

void PDFWriterImpl::appendStrokingColor( const Color& rColor, OStringBuffer& rBuffer )
{
    if( rColor != COL_TRANSPARENT )
    {
        bool bGrey = m_aContext.ColorMode == PDFWriter::DrawGreyscale;
        appendColor( rColor, rBuffer, bGrey );
        rBuffer.append( bGrey ? " G" : " RG" );
    }
}

void PDFWriterImpl::appendNonStrokingColor( const Color& rColor, OStringBuffer& rBuffer )
{
    if( rColor != COL_TRANSPARENT )
    {
        bool bGrey = m_aContext.ColorMode == PDFWriter::DrawGreyscale;
        appendColor( rColor, rBuffer, bGrey );
        rBuffer.append( bGrey ? " g" : " rg" );
    }
}

PDFPage::PDFPage( PDFWriterImpl* pWriter, double nPageWidth, double nPageHeight, PDFWriter::Orientation eOrientation )
        :
        m_pWriter( pWriter ),
        m_nPageWidth( nPageWidth ),
        m_nPageHeight( nPageHeight ),
        m_eOrientation( eOrientation ),
        m_nPageObject( 0 ),  // invalid object number
        m_nStreamLengthObject( 0 ),
        m_nBeginStreamPos( 0 ),
        m_eTransition( PDFWriter::PageTransition::Regular ),
        m_nTransTime( 0 )
{
    // object ref must be only ever updated in emit()
    m_nPageObject = m_pWriter->createObject();
}

void PDFPage::beginStream()
{
    if (g_bDebugDisableCompression)
    {
        m_pWriter->emitComment("PDFWriterImpl::PDFPage::beginStream, +");
    }
    m_aStreamObjects.push_back(m_pWriter->createObject());
    if( ! m_pWriter->updateObject( m_aStreamObjects.back() ) )
        return;

    m_nStreamLengthObject = m_pWriter->createObject();
    // write content stream header
    OStringBuffer aLine;
    aLine.append( m_aStreamObjects.back() );
    aLine.append( " 0 obj\n<</Length " );
    aLine.append( m_nStreamLengthObject );
    aLine.append( " 0 R" );
    if (!g_bDebugDisableCompression)
        aLine.append( "/Filter/FlateDecode" );
    aLine.append( ">>\nstream\n" );
    if( ! m_pWriter->writeBuffer( aLine.getStr(), aLine.getLength() ) )
        return;
    if (osl::File::E_None != m_pWriter->m_aFile.getPos(m_nBeginStreamPos))
    {
        m_pWriter->m_aFile.close();
        m_pWriter->m_bOpen = false;
    }
    if (!g_bDebugDisableCompression)
        m_pWriter->beginCompression();
    m_pWriter->checkAndEnableStreamEncryption( m_aStreamObjects.back() );
}

void PDFPage::endStream()
{
    if (!g_bDebugDisableCompression)
        m_pWriter->endCompression();
    sal_uInt64 nEndStreamPos;
    if (osl::File::E_None != m_pWriter->m_aFile.getPos(nEndStreamPos))
    {
        m_pWriter->m_aFile.close();
        m_pWriter->m_bOpen = false;
        return;
    }
    m_pWriter->disableStreamEncryption();
    if( ! m_pWriter->writeBuffer( "\nendstream\nendobj\n\n", 19 ) )
        return;
    // emit stream length object
    if( ! m_pWriter->updateObject( m_nStreamLengthObject ) )
        return;
    OString aLine =
        OString::number( m_nStreamLengthObject ) +
        " 0 obj\n"  +
        OString::number( static_cast<sal_Int64>(nEndStreamPos-m_nBeginStreamPos) ) +
        "\nendobj\n\n";
    m_pWriter->writeBuffer( aLine.getStr(), aLine.getLength() );
}

bool PDFPage::emit(sal_Int32 nParentObject )
{
    // emit page object
    if( ! m_pWriter->updateObject( m_nPageObject ) )
        return false;
    OStringBuffer aLine;

    aLine.append( m_nPageObject );
    aLine.append( " 0 obj\n"
                  "<</Type/Page/Parent " );
    aLine.append( nParentObject );
    aLine.append( " 0 R" );
    aLine.append( "/Resources " );
    aLine.append( m_pWriter->getResourceDictObj() );
    aLine.append( " 0 R" );
    if( m_nPageWidth && m_nPageHeight )
    {
        aLine.append( "/MediaBox[0 0 " );
        aLine.append( m_nPageWidth );
        aLine.append( ' ' );
        aLine.append( m_nPageHeight );
        aLine.append( "]" );
    }
    switch( m_eOrientation )
    {
        case PDFWriter::Orientation::Portrait: aLine.append( "/Rotate 0\n" );break;
        case PDFWriter::Orientation::Inherit:  break;
    }
    int nAnnots = m_aAnnotations.size();
    if( nAnnots > 0 )
    {
        aLine.append( "/Annots[\n" );
        for( int i = 0; i < nAnnots; i++ )
        {
            aLine.append( m_aAnnotations[i] );
            aLine.append( " 0 R" );
            aLine.append( ((i+1)%15) ? " " : "\n" );
        }
        aLine.append( "]\n" );
    }
    if( !m_aMCIDParents.empty() )
    {
        OStringBuffer aStructParents( 1024 );
        aStructParents.append( "[ " );
        int nParents = m_aMCIDParents.size();
        for( int i = 0; i < nParents; i++ )
        {
            aStructParents.append( m_aMCIDParents[i] );
            aStructParents.append( " 0 R" );
            aStructParents.append( ((i%10) == 9) ? "\n" : " " );
        }
        aStructParents.append( "]" );
        m_pWriter->m_aStructParentTree.push_back( aStructParents.makeStringAndClear() );

        aLine.append( "/StructParents " );
        aLine.append( sal_Int32(m_pWriter->m_aStructParentTree.size()-1) );
        aLine.append( "\n" );
    }
    if( m_eTransition != PDFWriter::PageTransition::Regular && m_nTransTime > 0 )
    {
        // transition duration
        aLine.append( "/Trans<</D " );
        appendDouble( static_cast<double>(m_nTransTime)/1000.0, aLine, 3 );
        aLine.append( "\n" );
        const char *pStyle = nullptr, *pDm = nullptr, *pM = nullptr, *pDi = nullptr;
        switch( m_eTransition )
        {
            case PDFWriter::PageTransition::SplitHorizontalInward:
                pStyle = "Split"; pDm = "H"; pM = "I"; break;
            case PDFWriter::PageTransition::SplitHorizontalOutward:
                pStyle = "Split"; pDm = "H"; pM = "O"; break;
            case PDFWriter::PageTransition::SplitVerticalInward:
                pStyle = "Split"; pDm = "V"; pM = "I"; break;
            case PDFWriter::PageTransition::SplitVerticalOutward:
                pStyle = "Split"; pDm = "V"; pM = "O"; break;
            case PDFWriter::PageTransition::BlindsHorizontal:
                pStyle = "Blinds"; pDm = "H"; break;
            case PDFWriter::PageTransition::BlindsVertical:
                pStyle = "Blinds"; pDm = "V"; break;
            case PDFWriter::PageTransition::BoxInward:
                pStyle = "Box"; pM = "I"; break;
            case PDFWriter::PageTransition::BoxOutward:
                pStyle = "Box"; pM = "O"; break;
            case PDFWriter::PageTransition::WipeLeftToRight:
                pStyle = "Wipe"; pDi = "0"; break;
            case PDFWriter::PageTransition::WipeBottomToTop:
                pStyle = "Wipe"; pDi = "90"; break;
            case PDFWriter::PageTransition::WipeRightToLeft:
                pStyle = "Wipe"; pDi = "180"; break;
            case PDFWriter::PageTransition::WipeTopToBottom:
                pStyle = "Wipe"; pDi = "270"; break;
            case PDFWriter::PageTransition::Dissolve:
                pStyle = "Dissolve"; break;
            case PDFWriter::PageTransition::Regular:
                break;
        }
        // transition style
        if( pStyle )
        {
            aLine.append( "/S/" );
            aLine.append( pStyle );
            aLine.append( "\n" );
        }
        if( pDm )
        {
            aLine.append( "/Dm/" );
            aLine.append( pDm );
            aLine.append( "\n" );
        }
        if( pM )
        {
            aLine.append( "/M/" );
            aLine.append( pM );
            aLine.append( "\n" );
        }
        if( pDi  )
        {
            aLine.append( "/Di " );
            aLine.append( pDi );
            aLine.append( "\n" );
        }
        aLine.append( ">>\n" );
    }
    if( m_pWriter->getVersion() > PDFWriter::PDFVersion::PDF_1_3 && ! m_pWriter->m_bIsPDF_A1 )
    {
        aLine.append( "/Group<</S/Transparency/CS/DeviceRGB/I true>>" );
    }
    aLine.append( "/Contents" );
    unsigned int nStreamObjects = m_aStreamObjects.size();
    if( nStreamObjects > 1 )
        aLine.append( '[' );
    for(sal_Int32 i : m_aStreamObjects)
    {
        aLine.append( ' ' );
        aLine.append( i );
        aLine.append( " 0 R" );
    }
    if( nStreamObjects > 1 )
        aLine.append( ']' );
    aLine.append( ">>\nendobj\n\n" );
    return m_pWriter->writeBuffer( aLine.getStr(), aLine.getLength() );
}

namespace vcl
{
template < class GEOMETRY >
static GEOMETRY lcl_convert( const MapMode& _rSource, const MapMode& _rDest, OutputDevice* _pPixelConversion, const GEOMETRY& _rObject )
{
    GEOMETRY aPoint;
    if ( MapUnit::MapPixel == _rSource.GetMapUnit() )
    {
        aPoint = _pPixelConversion->PixelToLogic( _rObject, _rDest );
    }
    else
    {
        aPoint = OutputDevice::LogicToLogic( _rObject, _rSource, _rDest );
    }
    return aPoint;
}
}

void PDFPage::appendPoint( const Point& rPoint, OStringBuffer& rBuffer ) const
{
    Point aPoint( lcl_convert( m_pWriter->m_aGraphicsStack.front().m_aMapMode,
                               m_pWriter->m_aMapMode,
                               m_pWriter,
                               rPoint ) );

    sal_Int32 nValue    = aPoint.X();

    appendFixedInt( nValue, rBuffer );

    rBuffer.append( ' ' );

    nValue      = pointToPixel(getHeight()) - aPoint.Y();

    appendFixedInt( nValue, rBuffer );
}

void PDFPage::appendPixelPoint( const basegfx::B2DPoint& rPoint, OStringBuffer& rBuffer ) const
{
    double fValue   = pixelToPoint(rPoint.getX());

    appendDouble( fValue, rBuffer, nLog10Divisor );
    rBuffer.append( ' ' );
    fValue      = getHeight() - pixelToPoint(rPoint.getY());
    appendDouble( fValue, rBuffer, nLog10Divisor );
}

void PDFPage::appendRect( const tools::Rectangle& rRect, OStringBuffer& rBuffer ) const
{
    appendPoint( rRect.BottomLeft() + Point( 0, 1 ), rBuffer );
    rBuffer.append( ' ' );
    appendMappedLength( static_cast<sal_Int32>(rRect.GetWidth()), rBuffer, false );
    rBuffer.append( ' ' );
    appendMappedLength( static_cast<sal_Int32>(rRect.GetHeight()), rBuffer );
    rBuffer.append( " re" );
}

void PDFPage::convertRect( tools::Rectangle& rRect ) const
{
    Point aLL = lcl_convert( m_pWriter->m_aGraphicsStack.front().m_aMapMode,
                             m_pWriter->m_aMapMode,
                             m_pWriter,
                             rRect.BottomLeft() + Point( 0, 1 )
                             );
    Size aSize = lcl_convert( m_pWriter->m_aGraphicsStack.front().m_aMapMode,
                              m_pWriter->m_aMapMode,
                              m_pWriter,
                              rRect.GetSize() );
    rRect.SetLeft( aLL.X() );
    rRect.SetRight( aLL.X() + aSize.Width() );
    rRect.SetTop( pointToPixel(getHeight()) - aLL.Y() );
    rRect.SetBottom( rRect.Top() + aSize.Height() );
}

void PDFPage::appendPolygon( const tools::Polygon& rPoly, OStringBuffer& rBuffer, bool bClose ) const
{
    sal_uInt16 nPoints = rPoly.GetSize();
    /*
     *  #108582# applications do weird things
     */
    sal_uInt32 nBufLen = rBuffer.getLength();
    if( nPoints > 0 )
    {
        const PolyFlags* pFlagArray = rPoly.GetConstFlagAry();
        appendPoint( rPoly[0], rBuffer );
        rBuffer.append( " m\n" );
        for( sal_uInt16 i = 1; i < nPoints; i++ )
        {
            if( pFlagArray && pFlagArray[i] == PolyFlags::Control && nPoints-i > 2 )
            {
                // bezier
                SAL_WARN_IF( pFlagArray[i+1] != PolyFlags::Control || pFlagArray[i+2] == PolyFlags::Control, "vcl.pdfwriter", "unexpected sequence of control points" );
                appendPoint( rPoly[i], rBuffer );
                rBuffer.append( " " );
                appendPoint( rPoly[i+1], rBuffer );
                rBuffer.append( " " );
                appendPoint( rPoly[i+2], rBuffer );
                rBuffer.append( " c" );
                i += 2; // add additionally consumed points
            }
            else
            {
                // line
                appendPoint( rPoly[i], rBuffer );
                rBuffer.append( " l" );
            }
            if( (rBuffer.getLength() - nBufLen) > 65 )
            {
                rBuffer.append( "\n" );
                nBufLen = rBuffer.getLength();
            }
            else
                rBuffer.append( " " );
        }
        if( bClose )
            rBuffer.append( "h\n" );
    }
}

void PDFPage::appendPolygon( const basegfx::B2DPolygon& rPoly, OStringBuffer& rBuffer ) const
{
    basegfx::B2DPolygon aPoly( lcl_convert( m_pWriter->m_aGraphicsStack.front().m_aMapMode,
                                            m_pWriter->m_aMapMode,
                                            m_pWriter,
                                            rPoly ) );

    if( basegfx::utils::isRectangle( aPoly ) )
    {
        basegfx::B2DRange aRange( aPoly.getB2DRange() );
        basegfx::B2DPoint aBL( aRange.getMinX(), aRange.getMaxY() );
        appendPixelPoint( aBL, rBuffer );
        rBuffer.append( ' ' );
        appendMappedLength( aRange.getWidth(), rBuffer, false, nLog10Divisor );
        rBuffer.append( ' ' );
        appendMappedLength( aRange.getHeight(), rBuffer, true, nLog10Divisor );
        rBuffer.append( " re\n" );
        return;
    }
    sal_uInt32 nPoints = aPoly.count();
    if( nPoints > 0 )
    {
        sal_uInt32 nBufLen = rBuffer.getLength();
        basegfx::B2DPoint aLastPoint( aPoly.getB2DPoint( 0 ) );
        appendPixelPoint( aLastPoint, rBuffer );
        rBuffer.append( " m\n" );
        for( sal_uInt32 i = 1; i <= nPoints; i++ )
        {
            if( i != nPoints || aPoly.isClosed() )
            {
                sal_uInt32 nCurPoint  = i % nPoints;
                sal_uInt32 nLastPoint = i-1;
                basegfx::B2DPoint aPoint( aPoly.getB2DPoint( nCurPoint ) );
                if( aPoly.isNextControlPointUsed( nLastPoint ) &&
                    aPoly.isPrevControlPointUsed( nCurPoint ) )
                {
                    appendPixelPoint( aPoly.getNextControlPoint( nLastPoint ), rBuffer );
                    rBuffer.append( ' ' );
                    appendPixelPoint( aPoly.getPrevControlPoint( nCurPoint ), rBuffer );
                    rBuffer.append( ' ' );
                    appendPixelPoint( aPoint, rBuffer );
                    rBuffer.append( " c" );
                }
                else if( aPoly.isNextControlPointUsed( nLastPoint ) )
                {
                    appendPixelPoint( aPoly.getNextControlPoint( nLastPoint ), rBuffer );
                    rBuffer.append( ' ' );
                    appendPixelPoint( aPoint, rBuffer );
                    rBuffer.append( " y" );
                }
                else if( aPoly.isPrevControlPointUsed( nCurPoint ) )
                {
                    appendPixelPoint( aPoly.getPrevControlPoint( nCurPoint ), rBuffer );
                    rBuffer.append( ' ' );
                    appendPixelPoint( aPoint, rBuffer );
                    rBuffer.append( " v" );
                }
                else
                {
                    appendPixelPoint( aPoint, rBuffer );
                    rBuffer.append( " l" );
                }
                if( (rBuffer.getLength() - nBufLen) > 65 )
                {
                    rBuffer.append( "\n" );
                    nBufLen = rBuffer.getLength();
                }
                else
                    rBuffer.append( " " );
            }
        }
        rBuffer.append( "h\n" );
    }
}

void PDFPage::appendPolyPolygon( const tools::PolyPolygon& rPolyPoly, OStringBuffer& rBuffer ) const
{
    sal_uInt16 nPolygons = rPolyPoly.Count();
    for( sal_uInt16 n = 0; n < nPolygons; n++ )
        appendPolygon( rPolyPoly[n], rBuffer );
}

void PDFPage::appendPolyPolygon( const basegfx::B2DPolyPolygon& rPolyPoly, OStringBuffer& rBuffer ) const
{
    for(auto const& rPolygon : rPolyPoly)
        appendPolygon( rPolygon, rBuffer );
}

void PDFPage::appendMappedLength( sal_Int32 nLength, OStringBuffer& rBuffer, bool bVertical, sal_Int32* pOutLength ) const
{
    sal_Int32 nValue = nLength;
    if ( nLength < 0 )
    {
        rBuffer.append( '-' );
        nValue = -nLength;
    }
    Size aSize( lcl_convert( m_pWriter->m_aGraphicsStack.front().m_aMapMode,
                             m_pWriter->m_aMapMode,
                             m_pWriter,
                             Size( nValue, nValue ) ) );
    nValue = bVertical ? aSize.Height() : aSize.Width();
    if( pOutLength )
        *pOutLength = ((nLength < 0 ) ? -nValue : nValue);

    appendFixedInt( nValue, rBuffer );
}

void PDFPage::appendMappedLength( double fLength, OStringBuffer& rBuffer, bool bVertical, sal_Int32 nPrecision ) const
{
    Size aSize( lcl_convert( m_pWriter->m_aGraphicsStack.front().m_aMapMode,
                             m_pWriter->m_aMapMode,
                             m_pWriter,
                             Size( 1000, 1000 ) ) );
    fLength *= pixelToPoint(static_cast<double>(bVertical ? aSize.Height() : aSize.Width()) / 1000.0);
    appendDouble( fLength, rBuffer, nPrecision );
}

bool PDFPage::appendLineInfo( const LineInfo& rInfo, OStringBuffer& rBuffer ) const
{
    if(LineStyle::Dash == rInfo.GetStyle() && rInfo.GetDashLen() != rInfo.GetDotLen())
    {
        // dashed and non-degraded case, check for implementation limits of dash array
        // in PDF reader apps (e.g. acroread)
        if(2 * (rInfo.GetDashCount() + rInfo.GetDotCount()) > 10)
        {
            return false;
        }
    }

    if(basegfx::B2DLineJoin::NONE != rInfo.GetLineJoin())
    {
        // LineJoin used, ExtLineInfo required
        return false;
    }

    if(css::drawing::LineCap_BUTT != rInfo.GetLineCap())
    {
        // LineCap used, ExtLineInfo required
        return false;
    }

    if( rInfo.GetStyle() == LineStyle::Dash )
    {
        rBuffer.append( "[ " );
        if( rInfo.GetDashLen() == rInfo.GetDotLen() ) // degraded case
        {
            appendMappedLength( rInfo.GetDashLen(), rBuffer );
            rBuffer.append( ' ' );
            appendMappedLength( rInfo.GetDistance(), rBuffer );
            rBuffer.append( ' ' );
        }
        else
        {
            for( int n = 0; n < rInfo.GetDashCount(); n++ )
            {
                appendMappedLength( rInfo.GetDashLen(), rBuffer );
                rBuffer.append( ' ' );
                appendMappedLength( rInfo.GetDistance(), rBuffer );
                rBuffer.append( ' ' );
            }
            for( int m = 0; m < rInfo.GetDotCount(); m++ )
            {
                appendMappedLength( rInfo.GetDotLen(), rBuffer );
                rBuffer.append( ' ' );
                appendMappedLength( rInfo.GetDistance(), rBuffer );
                rBuffer.append( ' ' );
            }
        }
        rBuffer.append( "] 0 d\n" );
    }

    if( rInfo.GetWidth() > 1 )
    {
        appendMappedLength( rInfo.GetWidth(), rBuffer );
        rBuffer.append( " w\n" );
    }
    else if( rInfo.GetWidth() == 0 )
    {
        // "pixel" line
        appendDouble( 72.0/double(m_pWriter->GetDPIX()), rBuffer );
        rBuffer.append( " w\n" );
    }

    return true;
}

void PDFPage::appendWaveLine( sal_Int32 nWidth, sal_Int32 nY, sal_Int32 nDelta, OStringBuffer& rBuffer ) const
{
    if( nWidth <= 0 )
        return;
    if( nDelta < 1 )
        nDelta = 1;

    rBuffer.append( "0 " );
    appendMappedLength( nY, rBuffer );
    rBuffer.append( " m\n" );
    for( sal_Int32 n = 0; n < nWidth; )
    {
        n += nDelta;
        appendMappedLength( n, rBuffer, false );
        rBuffer.append( ' ' );
        appendMappedLength( nDelta+nY, rBuffer );
        rBuffer.append( ' ' );
        n += nDelta;
        appendMappedLength( n, rBuffer, false );
        rBuffer.append( ' ' );
        appendMappedLength( nY, rBuffer );
        rBuffer.append( " v " );
        if( n < nWidth )
        {
            n += nDelta;
            appendMappedLength( n, rBuffer, false );
            rBuffer.append( ' ' );
            appendMappedLength( nY-nDelta, rBuffer );
            rBuffer.append( ' ' );
            n += nDelta;
            appendMappedLength( n, rBuffer, false );
            rBuffer.append( ' ' );
            appendMappedLength( nY, rBuffer );
            rBuffer.append( " v\n" );
        }
    }
    rBuffer.append( "S\n" );
}

void PDFPage::appendMatrix3(Matrix3 const & rMatrix, OStringBuffer& rBuffer)
{
    appendDouble(rMatrix.get(0), rBuffer);
    rBuffer.append(' ');
    appendDouble(rMatrix.get(1), rBuffer);
    rBuffer.append(' ');
    appendDouble(rMatrix.get(2), rBuffer);
    rBuffer.append(' ');
    appendDouble(rMatrix.get(3), rBuffer);
    rBuffer.append(' ');
    appendPoint(Point(long(rMatrix.get(4)), long(rMatrix.get(5))), rBuffer);
}

PDFWriterImpl::PDFWriterImpl( const PDFWriter::PDFWriterContext& rContext,
                               const css::uno::Reference< css::beans::XMaterialHolder >& xEnc,
                               PDFWriter& i_rOuterFace)
        : VirtualDevice(Application::GetDefaultDevice(), DeviceFormat::DEFAULT, DeviceFormat::NONE, OUTDEV_PDF),
        m_aMapMode( MapUnit::MapPoint, Point(), Fraction( 1, pointToPixel(1) ), Fraction( 1, pointToPixel(1) ) ),
        m_nCurrentStructElement( 0 ),
        m_bEmitStructure( true ),
        m_nNextFID( 1 ),
        m_nCurrentPage( -1 ),
        m_nCatalogObject(0),
        m_nSignatureObject( -1 ),
        m_nSignatureContentOffset( 0 ),
        m_nSignatureLastByteRangeNoOffset( 0 ),
        m_nResourceDict( -1 ),
        m_nFontDictObject( -1 ),
        m_aContext(rContext),
        m_aFile(m_aContext.URL),
        m_bOpen(false),
        m_DocDigest(::comphelper::HashType::MD5),
        m_aCipher( nullptr ),
        m_nKeyLength(0),
        m_nRC4KeyLength(0),
        m_bEncryptThisStream( false ),
        m_nAccessPermissions(0),
        m_bIsPDF_A1( false ),
        m_bIsPDF_A2( false ),
        m_bIsPDF_UA( false ),
        m_rOuterFace( i_rOuterFace )
{
    m_aStructure.emplace_back( );
    m_aStructure[0].m_nOwnElement       = 0;
    m_aStructure[0].m_nParentElement    = 0;

    Font aFont;
    aFont.SetFamilyName( "Times" );
    aFont.SetFontSize( Size( 0, 12 ) );

    GraphicsState aState;
    aState.m_aMapMode       = m_aMapMode;
    aState.m_aFont          = aFont;
    m_aGraphicsStack.push_front( aState );

    osl::File::RC aError = m_aFile.open(osl_File_OpenFlag_Write | osl_File_OpenFlag_Create);
    if (aError != osl::File::E_None)
    {
        if (aError == osl::File::E_EXIST)
        {
            aError = m_aFile.open(osl_File_OpenFlag_Write);
            if (aError == osl::File::E_None)
                aError = m_aFile.setSize(0);
        }
    }
    if (aError != osl::File::E_None)
        return;

    m_bOpen = true;

    // setup DocInfo
    setupDocInfo();

    /* prepare the cypher engine, can be done in CTOR, free in DTOR */
    m_aCipher = rtl_cipher_createARCFOUR( rtl_Cipher_ModeStream );

    if( xEnc.is() )
        prepareEncryption( xEnc );

    if( m_aContext.Encryption.Encrypt() )
    {
        // sanity check
        if( m_aContext.Encryption.OValue.size() != ENCRYPTED_PWD_SIZE ||
            m_aContext.Encryption.UValue.size() != ENCRYPTED_PWD_SIZE ||
            m_aContext.Encryption.EncryptionKey.size() != MAXIMUM_RC4_KEY_LENGTH
           )
        {
            // the field lengths are invalid ? This was not setup by initEncryption.
            // do not encrypt after all
            m_aContext.Encryption.OValue.clear();
            m_aContext.Encryption.UValue.clear();
            OSL_ENSURE( false, "encryption data failed sanity check, encryption disabled" );
        }
        else // setup key lengths
            m_nAccessPermissions = computeAccessPermissions( m_aContext.Encryption, m_nKeyLength, m_nRC4KeyLength );
    }

    // write header
    OStringBuffer aBuffer( 20 );
    aBuffer.append( "%PDF-" );
    switch( m_aContext.Version )
    {
        case PDFWriter::PDFVersion::PDF_1_2: aBuffer.append( "1.2" );break;
        case PDFWriter::PDFVersion::PDF_1_3: aBuffer.append( "1.3" );break;
        case PDFWriter::PDFVersion::PDF_A_1:
        case PDFWriter::PDFVersion::PDF_1_4: aBuffer.append( "1.4" );break;
        default:
        case PDFWriter::PDFVersion::PDF_1_5: aBuffer.append( "1.5" );break;
        case PDFWriter::PDFVersion::PDF_1_6: aBuffer.append( "1.6" );break;
    }
    // append something binary as comment (suggested in PDF Reference)
    aBuffer.append( "\n%\303\244\303\274\303\266\303\237\n" );
    if( !writeBuffer( aBuffer.getStr(), aBuffer.getLength() ) )
    {
        m_aFile.close();
        m_bOpen = false;
        return;
    }

    // insert outline root
    m_aOutline.emplace_back( );

    m_bIsPDF_A1 = (m_aContext.Version == PDFWriter::PDFVersion::PDF_A_1);
    if( m_bIsPDF_A1 )
        m_aContext.Version = PDFWriter::PDFVersion::PDF_1_4; //meaning we need PDF 1.4, PDF/A flavour

    m_bIsPDF_A2 = (m_aContext.Version == PDFWriter::PDFVersion::PDF_A_2);
    if( m_bIsPDF_A2 )
        m_aContext.Version = PDFWriter::PDFVersion::PDF_1_6; //we could even use 1.7 features

    if (m_aContext.UniversalAccessibilityCompliance)
    {
        m_bIsPDF_UA = true;
        m_aContext.Tagged = true;
    }

    if( m_aContext.DPIx == 0 || m_aContext.DPIy == 0 )
        SetReferenceDevice( VirtualDevice::RefDevMode::PDF1 );
    else
        SetReferenceDevice( m_aContext.DPIx, m_aContext.DPIy );

    SetOutputSizePixel( Size( 640, 480 ) );
    SetMapMode(MapMode(MapUnit::MapMM));
}

PDFWriterImpl::~PDFWriterImpl()
{
    disposeOnce();
}

void PDFWriterImpl::dispose()
{
    if( m_aCipher )
        rtl_cipher_destroyARCFOUR( m_aCipher );
    m_aPages.clear();
    VirtualDevice::dispose();
}

void PDFWriterImpl::setupDocInfo()
{
    std::vector< sal_uInt8 > aId;
    m_aCreationDateString = PDFWriter::GetDateTime();
    computeDocumentIdentifier( aId, m_aContext.DocumentInfo, m_aCreationDateString, m_aCreationMetaDateString );
    if( m_aContext.Encryption.DocumentIdentifier.empty() )
        m_aContext.Encryption.DocumentIdentifier = aId;
}

OString PDFWriter::GetDateTime()
{
    OStringBuffer aRet;

    TimeValue aTVal, aGMT;
    oslDateTime aDT;
    osl_getSystemTime(&aGMT);
    osl_getLocalTimeFromSystemTime(&aGMT, &aTVal);
    osl_getDateTimeFromTimeValue(&aTVal, &aDT);
    aRet.append("D:");
    aRet.append(static_cast<char>('0' + ((aDT.Year / 1000) % 10)));
    aRet.append(static_cast<char>('0' + ((aDT.Year / 100) % 10)));
    aRet.append(static_cast<char>('0' + ((aDT.Year / 10) % 10)));
    aRet.append(static_cast<char>('0' + (aDT.Year % 10)));
    aRet.append(static_cast<char>('0' + ((aDT.Month / 10) % 10)));
    aRet.append(static_cast<char>('0' + (aDT.Month % 10)));
    aRet.append(static_cast<char>('0' + ((aDT.Day / 10) % 10)));
    aRet.append(static_cast<char>('0' + (aDT.Day % 10)));
    aRet.append(static_cast<char>('0' + ((aDT.Hours / 10) % 10)));
    aRet.append(static_cast<char>('0' + (aDT.Hours % 10)));
    aRet.append(static_cast<char>('0' + ((aDT.Minutes / 10) % 10)));
    aRet.append(static_cast<char>('0' + (aDT.Minutes % 10)));
    aRet.append(static_cast<char>('0' + ((aDT.Seconds / 10) % 10)));
    aRet.append(static_cast<char>('0' + (aDT.Seconds % 10)));

    sal_uInt32 nDelta = 0;
    if (aGMT.Seconds > aTVal.Seconds)
    {
        aRet.append("-");
        nDelta = aGMT.Seconds-aTVal.Seconds;
    }
    else if (aGMT.Seconds < aTVal.Seconds)
    {
        aRet.append("+");
        nDelta = aTVal.Seconds-aGMT.Seconds;
    }
    else
        aRet.append("Z");

    if (nDelta)
    {
        aRet.append(static_cast<char>('0' + ((nDelta / 36000) % 10)));
        aRet.append(static_cast<char>('0' + ((nDelta / 3600) % 10)));
        aRet.append("'");
        aRet.append(static_cast<char>('0' + ((nDelta / 600) % 6)));
        aRet.append(static_cast<char>('0' + ((nDelta / 60) % 10)));
    }
    aRet.append( "'" );

    return aRet.makeStringAndClear();
}

void PDFWriterImpl::computeDocumentIdentifier( std::vector< sal_uInt8 >& o_rIdentifier,
                                               const vcl::PDFWriter::PDFDocInfo& i_rDocInfo,
                                               const OString& i_rCString1,
                                               OString& o_rCString2
                                               )
{
    o_rIdentifier.clear();

    //build the document id
    OString aInfoValuesOut;
    OStringBuffer aID( 1024 );
    if( !i_rDocInfo.Title.isEmpty() )
        PDFWriter::AppendUnicodeTextString(i_rDocInfo.Title, aID);
    if( !i_rDocInfo.Author.isEmpty() )
        PDFWriter::AppendUnicodeTextString(i_rDocInfo.Author, aID);
    if( !i_rDocInfo.Subject.isEmpty() )
        PDFWriter::AppendUnicodeTextString(i_rDocInfo.Subject, aID);
    if( !i_rDocInfo.Keywords.isEmpty() )
        PDFWriter::AppendUnicodeTextString(i_rDocInfo.Keywords, aID);
    if( !i_rDocInfo.Creator.isEmpty() )
        PDFWriter::AppendUnicodeTextString(i_rDocInfo.Creator, aID);
    if( !i_rDocInfo.Producer.isEmpty() )
        PDFWriter::AppendUnicodeTextString(i_rDocInfo.Producer, aID);

    TimeValue aTVal, aGMT;
    oslDateTime aDT;
    osl_getSystemTime( &aGMT );
    osl_getLocalTimeFromSystemTime( &aGMT, &aTVal );
    osl_getDateTimeFromTimeValue( &aTVal, &aDT );
    OStringBuffer aCreationMetaDateString(64);

    // i59651: we fill the Metadata date string as well, if PDF/A is requested
    // according to ISO 19005-1:2005 6.7.3 the date is corrected for
    // local time zone offset UTC only, whereas Acrobat 8 seems
    // to use the localtime notation only
    // according to a recommendation in XMP Specification (Jan 2004, page 75)
    // the Acrobat way seems the right approach
    aCreationMetaDateString.append( static_cast<char>('0' + ((aDT.Year/1000)%10)) );
    aCreationMetaDateString.append( static_cast<char>('0' + ((aDT.Year/100)%10)) );
    aCreationMetaDateString.append( static_cast<char>('0' + ((aDT.Year/10)%10)) );
    aCreationMetaDateString.append( static_cast<char>('0' + ((aDT.Year)%10)) );
    aCreationMetaDateString.append( "-" );
    aCreationMetaDateString.append( static_cast<char>('0' + ((aDT.Month/10)%10)) );
    aCreationMetaDateString.append( static_cast<char>('0' + ((aDT.Month)%10)) );
    aCreationMetaDateString.append( "-" );
    aCreationMetaDateString.append( static_cast<char>('0' + ((aDT.Day/10)%10)) );
    aCreationMetaDateString.append( static_cast<char>('0' + ((aDT.Day)%10)) );
    aCreationMetaDateString.append( "T" );
    aCreationMetaDateString.append( static_cast<char>('0' + ((aDT.Hours/10)%10)) );
    aCreationMetaDateString.append( static_cast<char>('0' + ((aDT.Hours)%10)) );
    aCreationMetaDateString.append( ":" );
    aCreationMetaDateString.append( static_cast<char>('0' + ((aDT.Minutes/10)%10)) );
    aCreationMetaDateString.append( static_cast<char>('0' + ((aDT.Minutes)%10)) );
    aCreationMetaDateString.append( ":" );
    aCreationMetaDateString.append( static_cast<char>('0' + ((aDT.Seconds/10)%10)) );
    aCreationMetaDateString.append( static_cast<char>('0' + ((aDT.Seconds)%10)) );

    sal_uInt32 nDelta = 0;
    if( aGMT.Seconds > aTVal.Seconds )
    {
        nDelta = aGMT.Seconds-aTVal.Seconds;
        aCreationMetaDateString.append( "-" );
    }
    else if( aGMT.Seconds < aTVal.Seconds )
    {
        nDelta = aTVal.Seconds-aGMT.Seconds;
        aCreationMetaDateString.append( "+" );
    }
    else
    {
        aCreationMetaDateString.append( "Z" );

    }
    if( nDelta )
    {
        aCreationMetaDateString.append( static_cast<char>('0' + ((nDelta/36000)%10)) );
        aCreationMetaDateString.append( static_cast<char>('0' + ((nDelta/3600)%10)) );
        aCreationMetaDateString.append( ":" );
        aCreationMetaDateString.append( static_cast<char>('0' + ((nDelta/600)%6)) );
        aCreationMetaDateString.append( static_cast<char>('0' + ((nDelta/60)%10)) );
    }
    aID.append( i_rCString1.getStr(), i_rCString1.getLength() );

    aInfoValuesOut = aID.makeStringAndClear();
    o_rCString2 = aCreationMetaDateString.makeStringAndClear();

    ::comphelper::Hash aDigest(::comphelper::HashType::MD5);
    aDigest.update(reinterpret_cast<unsigned char const*>(&aGMT), sizeof(aGMT));
    aDigest.update(reinterpret_cast<unsigned char const*>(aInfoValuesOut.getStr()), aInfoValuesOut.getLength());
    //the binary form of the doc id is needed for encryption stuff
    o_rIdentifier = aDigest.finalize();
}

/* i12626 methods */
/*
check if the Unicode string must be encrypted or not, perform the requested task,
append the string as unicode hex, encrypted if needed
 */
inline void PDFWriterImpl::appendUnicodeTextStringEncrypt( const OUString& rInString, const sal_Int32 nInObjectNumber, OStringBuffer& rOutBuffer )
{
    rOutBuffer.append( "<" );
    if( m_aContext.Encryption.Encrypt() )
    {
        const sal_Unicode* pStr = rInString.getStr();
        sal_Int32 nLen = rInString.getLength();
        //prepare a unicode string, encrypt it
        enableStringEncryption( nInObjectNumber );
        sal_uInt8 *pCopy = m_vEncryptionBuffer.data();
        sal_Int32 nChars = 2 + (nLen * 2);
        m_vEncryptionBuffer.resize(nChars);
        *pCopy++ = 0xFE;
        *pCopy++ = 0xFF;
        // we need to prepare a byte stream from the unicode string buffer
        for( int i = 0; i < nLen; i++ )
        {
            sal_Unicode aUnChar = pStr[i];
            *pCopy++ = static_cast<sal_uInt8>( aUnChar >> 8 );
            *pCopy++ = static_cast<sal_uInt8>( aUnChar & 255 );
        }
        //encrypt in place
        rtl_cipher_encodeARCFOUR( m_aCipher, m_vEncryptionBuffer.data(), nChars, m_vEncryptionBuffer.data(), nChars );
        //now append, hexadecimal (appendHex), the encrypted result
        for(int i = 0; i < nChars; i++)
            appendHex( m_vEncryptionBuffer[i], rOutBuffer );
    }
    else
        PDFWriter::AppendUnicodeTextString(rInString, rOutBuffer);
    rOutBuffer.append( ">" );
}

inline void PDFWriterImpl::appendLiteralStringEncrypt( OStringBuffer const & rInString, const sal_Int32 nInObjectNumber, OStringBuffer& rOutBuffer )
{
    rOutBuffer.append( "(" );
    sal_Int32 nChars = rInString.getLength();
    //check for encryption, if ok, encrypt the string, then convert with appndLiteralString
    if( m_aContext.Encryption.Encrypt() )
    {
        m_vEncryptionBuffer.resize(nChars);
        //encrypt the string in a buffer, then append it
        enableStringEncryption( nInObjectNumber );
        rtl_cipher_encodeARCFOUR( m_aCipher, rInString.getStr(), nChars, m_vEncryptionBuffer.data(), nChars );
        appendLiteralString( reinterpret_cast<char*>(m_vEncryptionBuffer.data()), nChars, rOutBuffer );
    }
    else
        appendLiteralString( rInString.getStr(), nChars , rOutBuffer );
    rOutBuffer.append( ")" );
}

inline void PDFWriterImpl::appendLiteralStringEncrypt( const OString& rInString, const sal_Int32 nInObjectNumber, OStringBuffer& rOutBuffer )
{
    OStringBuffer aBufferString( rInString );
    appendLiteralStringEncrypt( aBufferString, nInObjectNumber, rOutBuffer);
}

void PDFWriterImpl::appendLiteralStringEncrypt( const OUString& rInString, const sal_Int32 nInObjectNumber, OStringBuffer& rOutBuffer, rtl_TextEncoding nEnc )
{
    OString aBufferString( OUStringToOString( rInString, nEnc ) );
    sal_Int32 nLen = aBufferString.getLength();
    OStringBuffer aBuf( nLen );
    const char* pT = aBufferString.getStr();

    for( sal_Int32 i = 0; i < nLen; i++, pT++ )
    {
        if( (*pT & 0x80) == 0 )
            aBuf.append( *pT );
        else
        {
            aBuf.append( '<' );
            appendHex( *pT, aBuf );
            aBuf.append( '>' );
        }
    }
    aBufferString = aBuf.makeStringAndClear();
    appendLiteralStringEncrypt( aBufferString, nInObjectNumber, rOutBuffer);
}

/* end i12626 methods */

void PDFWriterImpl::emitComment( const char* pComment )
{
    OString aLine = "% " + rtl::OStringView(pComment) + "\n";
    writeBuffer( aLine.getStr(), aLine.getLength() );
}

bool PDFWriterImpl::compressStream( SvMemoryStream* pStream )
{
    if (!g_bDebugDisableCompression)
    {
        sal_uLong nEndPos = pStream->TellEnd();
        pStream->Seek( STREAM_SEEK_TO_BEGIN );
        ZCodec aCodec( 0x4000, 0x4000 );
        SvMemoryStream aStream;
        aCodec.BeginCompression();
        aCodec.Write( aStream, static_cast<const sal_uInt8*>(pStream->GetData()), nEndPos );
        aCodec.EndCompression();
        nEndPos = aStream.Tell();
        pStream->Seek( STREAM_SEEK_TO_BEGIN );
        aStream.Seek( STREAM_SEEK_TO_BEGIN );
        pStream->SetStreamSize( nEndPos );
        pStream->WriteBytes( aStream.GetData(), nEndPos );
        return true;
    }
    else
        return false;
}

void PDFWriterImpl::beginCompression()
{
    if (!g_bDebugDisableCompression)
    {
        m_pCodec = std::make_unique<ZCodec>( 0x4000, 0x4000 );
        m_pMemStream = std::make_unique<SvMemoryStream>();
        m_pCodec->BeginCompression();
    }
}

void PDFWriterImpl::endCompression()
{
    if (!g_bDebugDisableCompression && m_pCodec)
    {
        m_pCodec->EndCompression();
        m_pCodec.reset();
        sal_uInt64 nLen = m_pMemStream->Tell();
        m_pMemStream->Seek( 0 );
        writeBuffer( m_pMemStream->GetData(), nLen );
        m_pMemStream.reset();
    }
}

bool PDFWriterImpl::writeBuffer( const void* pBuffer, sal_uInt64 nBytes )
{
    if( ! m_bOpen ) // we are already down the drain
        return false;

    if( ! nBytes ) // huh ?
        return true;

    if( !m_aOutputStreams.empty() )
    {
        m_aOutputStreams.front().m_pStream->Seek( STREAM_SEEK_TO_END );
        m_aOutputStreams.front().m_pStream->WriteBytes(
                pBuffer, sal::static_int_cast<std::size_t>(nBytes));
        return true;
    }

    sal_uInt64 nWritten;
    if( m_pCodec )
    {
        m_pCodec->Write( *m_pMemStream, static_cast<const sal_uInt8*>(pBuffer), static_cast<sal_uLong>(nBytes) );
        nWritten = nBytes;
    }
    else
    {
        bool  buffOK = true;
        if( m_bEncryptThisStream )
        {
            /* implement the encryption part of the PDF spec encryption algorithm 3.1 */
            m_vEncryptionBuffer.resize(nBytes);
            if( buffOK )
                rtl_cipher_encodeARCFOUR( m_aCipher,
                                          pBuffer, static_cast<sal_Size>(nBytes),
                                          m_vEncryptionBuffer.data(), static_cast<sal_Size>(nBytes) );
        }

        const void* pWriteBuffer = ( m_bEncryptThisStream && buffOK ) ? m_vEncryptionBuffer.data()  : pBuffer;
        m_DocDigest.update(static_cast<unsigned char const*>(pWriteBuffer), static_cast<sal_uInt32>(nBytes));

        if (m_aFile.write(pWriteBuffer, nBytes, nWritten) != osl::File::E_None)
            nWritten = 0;

        if( nWritten != nBytes )
        {
            m_aFile.close();
            m_bOpen = false;
        }
    }

    return nWritten == nBytes;
}

void PDFWriterImpl::newPage( double nPageWidth, double nPageHeight, PDFWriter::Orientation eOrientation )
{
    endPage();
    m_nCurrentPage = m_aPages.size();
    m_aPages.emplace_back(this, nPageWidth, nPageHeight, eOrientation );
    m_aPages.back().beginStream();

    // setup global graphics state
    // linewidth is "1 pixel" by default
    OStringBuffer aBuf( 16 );
    appendDouble( 72.0/double(GetDPIX()), aBuf );
    aBuf.append( " w\n" );
    writeBuffer( aBuf.getStr(), aBuf.getLength() );
}

void PDFWriterImpl::endPage()
{
    if( m_aPages.empty() )
        return;

    // close eventual MC sequence
    endStructureElementMCSeq();

    // sanity check
    if( !m_aOutputStreams.empty() )
    {
        OSL_FAIL( "redirection across pages !!!" );
        m_aOutputStreams.clear(); // leak !
        m_aMapMode.SetOrigin( Point() );
    }

    m_aGraphicsStack.clear();
    m_aGraphicsStack.emplace_back( );

    // this should pop the PDF graphics stack if necessary
    updateGraphicsState();

    m_aPages.back().endStream();

    // reset the default font
    Font aFont;
    aFont.SetFamilyName( "Times" );
    aFont.SetFontSize( Size( 0, 12 ) );

    m_aCurrentPDFState = m_aGraphicsStack.front();
    m_aGraphicsStack.front().m_aFont =  aFont;

    for (auto & bitmap : m_aBitmaps)
    {
        if( ! bitmap.m_aBitmap.IsEmpty() )
        {
            writeBitmapObject(bitmap);
            bitmap.m_aBitmap = BitmapEx();
        }
    }
    for (auto & jpeg : m_aJPGs)
    {
        if( jpeg.m_pStream )
        {
            writeJPG( jpeg );
            jpeg.m_pStream.reset();
            jpeg.m_aMask = Bitmap();
        }
    }
    for (auto & item : m_aTransparentObjects)
    {
        if( item.m_pContentStream )
        {
            writeTransparentObject(item);
            item.m_pContentStream.reset();
        }
    }

}

sal_Int32 PDFWriterImpl::createObject()
{
    m_aObjects.push_back( ~0U );
    return m_aObjects.size();
}

bool PDFWriterImpl::updateObject( sal_Int32 n )
{
    if( ! m_bOpen )
        return false;

    sal_uInt64 nOffset = ~0U;
    osl::File::RC aError = m_aFile.getPos(nOffset);
    SAL_WARN_IF( aError != osl::File::E_None, "vcl.pdfwriter", "could not register object" );
    if (aError != osl::File::E_None)
    {
        m_aFile.close();
        m_bOpen = false;
    }
    m_aObjects[ n-1 ] = nOffset;
    return aError == osl::File::E_None;
}

#define CHECK_RETURN( x ) if( !(x) ) return 0
#define CHECK_RETURN2( x ) if( !(x) ) return

sal_Int32 PDFWriterImpl::emitStructParentTree( sal_Int32 nObject )
{
    if( nObject > 0 )
    {
        OStringBuffer aLine( 1024 );

        aLine.append( nObject );
        aLine.append( " 0 obj\n"
                      "<</Nums[\n" );
        sal_Int32 nTreeItems = m_aStructParentTree.size();
        for( sal_Int32 n = 0; n < nTreeItems; n++ )
        {
            aLine.append( n );
            aLine.append( ' ' );
            aLine.append( m_aStructParentTree[n] );
            aLine.append( "\n" );
        }
        aLine.append( "]>>\nendobj\n\n" );
        CHECK_RETURN( updateObject( nObject ) );
        CHECK_RETURN( writeBuffer( aLine.getStr(), aLine.getLength() ) );
    }
    return nObject;
}

const char* PDFWriterImpl::getAttributeTag( PDFWriter::StructAttribute eAttr )
{
    static std::map< PDFWriter::StructAttribute, const char* > aAttributeStrings;
    // fill maps once
    if( aAttributeStrings.empty() )
    {
        aAttributeStrings[ PDFWriter::Placement ]           = "Placement";
        aAttributeStrings[ PDFWriter::WritingMode ]         = "WritingMode";
        aAttributeStrings[ PDFWriter::SpaceBefore ]         = "SpaceBefore";
        aAttributeStrings[ PDFWriter::SpaceAfter ]          = "SpaceAfter";
        aAttributeStrings[ PDFWriter::StartIndent ]         = "StartIndent";
        aAttributeStrings[ PDFWriter::EndIndent ]           = "EndIndent";
        aAttributeStrings[ PDFWriter::TextIndent ]          = "TextIndent";
        aAttributeStrings[ PDFWriter::TextAlign ]           = "TextAlign";
        aAttributeStrings[ PDFWriter::Width ]               = "Width";
        aAttributeStrings[ PDFWriter::Height ]              = "Height";
        aAttributeStrings[ PDFWriter::BlockAlign ]          = "BlockAlign";
        aAttributeStrings[ PDFWriter::InlineAlign ]         = "InlineAlign";
        aAttributeStrings[ PDFWriter::LineHeight ]          = "LineHeight";
        aAttributeStrings[ PDFWriter::BaselineShift ]       = "BaselineShift";
        aAttributeStrings[ PDFWriter::TextDecorationType ]  = "TextDecorationType";
        aAttributeStrings[ PDFWriter::ListNumbering ]       = "ListNumbering";
        aAttributeStrings[ PDFWriter::RowSpan ]             = "RowSpan";
        aAttributeStrings[ PDFWriter::ColSpan ]             = "ColSpan";
        aAttributeStrings[ PDFWriter::LinkAnnotation ]      = "LinkAnnotation";
    }

    std::map< PDFWriter::StructAttribute, const char* >::const_iterator it =
        aAttributeStrings.find( eAttr );

    if( it == aAttributeStrings.end() )
        SAL_INFO("vcl.pdfwriter", "invalid PDFWriter::StructAttribute " << eAttr);

    return it != aAttributeStrings.end() ? it->second : "";
}

const char* PDFWriterImpl::getAttributeValueTag( PDFWriter::StructAttributeValue eVal )
{
    static std::map< PDFWriter::StructAttributeValue, const char* > aValueStrings;

    if( aValueStrings.empty() )
    {
        aValueStrings[ PDFWriter::NONE ]                    = "None";
        aValueStrings[ PDFWriter::Block ]                   = "Block";
        aValueStrings[ PDFWriter::Inline ]                  = "Inline";
        aValueStrings[ PDFWriter::Before ]                  = "Before";
        aValueStrings[ PDFWriter::After ]                   = "After";
        aValueStrings[ PDFWriter::Start ]                   = "Start";
        aValueStrings[ PDFWriter::End ]                     = "End";
        aValueStrings[ PDFWriter::LrTb ]                    = "LrTb";
        aValueStrings[ PDFWriter::RlTb ]                    = "RlTb";
        aValueStrings[ PDFWriter::TbRl ]                    = "TbRl";
        aValueStrings[ PDFWriter::Center ]                  = "Center";
        aValueStrings[ PDFWriter::Justify ]                 = "Justify";
        aValueStrings[ PDFWriter::Auto ]                    = "Auto";
        aValueStrings[ PDFWriter::Middle ]                  = "Middle";
        aValueStrings[ PDFWriter::Normal ]                  = "Normal";
        aValueStrings[ PDFWriter::Underline ]               = "Underline";
        aValueStrings[ PDFWriter::Overline ]                = "Overline";
        aValueStrings[ PDFWriter::LineThrough ]             = "LineThrough";
        aValueStrings[ PDFWriter::Disc ]                    = "Disc";
        aValueStrings[ PDFWriter::Circle ]                  = "Circle";
        aValueStrings[ PDFWriter::Square ]                  = "Square";
        aValueStrings[ PDFWriter::Decimal ]                 = "Decimal";
        aValueStrings[ PDFWriter::UpperRoman ]              = "UpperRoman";
        aValueStrings[ PDFWriter::LowerRoman ]              = "LowerRoman";
        aValueStrings[ PDFWriter::UpperAlpha ]              = "UpperAlpha";
        aValueStrings[ PDFWriter::LowerAlpha ]              = "LowerAlpha";
    }

    std::map< PDFWriter::StructAttributeValue, const char* >::const_iterator it =
        aValueStrings.find( eVal );

    if( it == aValueStrings.end() )
        SAL_INFO("vcl.pdfwriter", "invalid PDFWriter::StructAttributeValue " << eVal);

    return it != aValueStrings.end() ? it->second : "";
}

static void appendStructureAttributeLine( PDFWriter::StructAttribute i_eAttr, const PDFStructureAttribute& i_rVal, OStringBuffer& o_rLine, bool i_bIsFixedInt )
{
    o_rLine.append( "/" );
    o_rLine.append( PDFWriterImpl::getAttributeTag( i_eAttr ) );

    if( i_rVal.eValue != PDFWriter::Invalid )
    {
        o_rLine.append( "/" );
        o_rLine.append( PDFWriterImpl::getAttributeValueTag( i_rVal.eValue ) );
    }
    else
    {
        // numerical value
        o_rLine.append( " " );
        if( i_bIsFixedInt )
            appendFixedInt( i_rVal.nValue, o_rLine );
        else
            o_rLine.append( i_rVal.nValue );
    }
    o_rLine.append( "\n" );
}

OString PDFWriterImpl::emitStructureAttributes( PDFStructureElement& i_rEle )
{
    // create layout, list and table attribute sets
    OStringBuffer aLayout(256), aList(64), aTable(64);
    for (auto const& attribute : i_rEle.m_aAttributes)
    {
        if( attribute.first == PDFWriter::ListNumbering )
            appendStructureAttributeLine( attribute.first, attribute.second, aList, true );
        else if( attribute.first == PDFWriter::RowSpan ||
                 attribute.first == PDFWriter::ColSpan )
            appendStructureAttributeLine( attribute.first, attribute.second, aTable, false );
        else if( attribute.first == PDFWriter::LinkAnnotation )
        {
            sal_Int32 nLink = attribute.second.nValue;
            std::map< sal_Int32, sal_Int32 >::const_iterator link_it =
                m_aLinkPropertyMap.find( nLink );
            if( link_it != m_aLinkPropertyMap.end() )
                nLink = link_it->second;
            if( nLink >= 0 && nLink < static_cast<sal_Int32>(m_aLinks.size()) )
            {
                // update struct parent of link
                OString aStructParentEntry =
                    OString::number( i_rEle.m_nObject ) +
                    " 0 R";
                m_aStructParentTree.push_back( aStructParentEntry );
                m_aLinks[ nLink ].m_nStructParent = m_aStructParentTree.size()-1;

                sal_Int32 nRefObject = createObject();
                if (updateObject(nRefObject))
                {
                    OString aRef =
                        OString::number( nRefObject ) +
                        " 0 obj\n"
                        "<</Type/OBJR/Obj " +
                        OString::number( m_aLinks[ nLink ].m_nObject ) +
                        " 0 R>>\n"
                        "endobj\n\n";
                    writeBuffer( aRef.getStr(), aRef.getLength() );
                }

                i_rEle.m_aKids.emplace_back( nRefObject );
            }
            else
            {
                OSL_FAIL( "unresolved link id for Link structure" );
                SAL_INFO("vcl.pdfwriter", "unresolved link id " << nLink << " for Link structure");
                if (g_bDebugDisableCompression)
                {
                    OString aLine = "unresolved link id " +
                            OString::number( nLink ) +
                            " for Link structure";
                    emitComment( aLine.getStr() );
                }
            }
        }
        else
            appendStructureAttributeLine( attribute.first, attribute.second, aLayout, true );
    }
    if( ! i_rEle.m_aBBox.IsEmpty() )
    {
        aLayout.append( "/BBox[" );
        appendFixedInt( i_rEle.m_aBBox.Left(), aLayout );
        aLayout.append( " " );
        appendFixedInt( i_rEle.m_aBBox.Top(), aLayout );
        aLayout.append( " " );
        appendFixedInt( i_rEle.m_aBBox.Right(), aLayout );
        aLayout.append( " " );
        appendFixedInt( i_rEle.m_aBBox.Bottom(), aLayout );
        aLayout.append( "]\n" );
    }

    std::vector< sal_Int32 > aAttribObjects;
    if( !aLayout.isEmpty() )
    {
        aAttribObjects.push_back( createObject() );
        if (updateObject( aAttribObjects.back() ))
        {
            OStringBuffer aObj( 64 );
            aObj.append( aAttribObjects.back() );
            aObj.append( " 0 obj\n"
                         "<</O/Layout\n" );
            aLayout.append( ">>\nendobj\n\n" );
            writeBuffer( aObj.getStr(), aObj.getLength() );
            writeBuffer( aLayout.getStr(), aLayout.getLength() );
        }
    }
    if( !aList.isEmpty() )
    {
        aAttribObjects.push_back( createObject() );
        if (updateObject( aAttribObjects.back() ))
        {
            OStringBuffer aObj( 64 );
            aObj.append( aAttribObjects.back() );
            aObj.append( " 0 obj\n"
                         "<</O/List\n" );
            aList.append( ">>\nendobj\n\n" );
            writeBuffer( aObj.getStr(), aObj.getLength() );
            writeBuffer( aList.getStr(), aList.getLength() );
        }
    }
    if( !aTable.isEmpty() )
    {
        aAttribObjects.push_back( createObject() );
        if (updateObject( aAttribObjects.back() ))
        {
            OStringBuffer aObj( 64 );
            aObj.append( aAttribObjects.back() );
            aObj.append( " 0 obj\n"
                         "<</O/Table\n" );
            aTable.append( ">>\nendobj\n\n" );
            writeBuffer( aObj.getStr(), aObj.getLength() );
            writeBuffer( aTable.getStr(), aTable.getLength() );
        }
    }

    OStringBuffer aRet( 64 );
    if( aAttribObjects.size() > 1 )
        aRet.append( " [" );
    for (auto const& attrib : aAttribObjects)
    {
        aRet.append( " " );
        aRet.append( attrib );
        aRet.append( " 0 R" );
    }
    if( aAttribObjects.size() > 1 )
        aRet.append( " ]" );
    return aRet.makeStringAndClear();
}

sal_Int32 PDFWriterImpl::emitStructure( PDFStructureElement& rEle )
{
    if(
       // do not emit NonStruct and its children
       rEle.m_eType == PDFWriter::NonStructElement &&
       rEle.m_nOwnElement != rEle.m_nParentElement // but of course emit the struct tree root
       )
        return 0;

    for (auto const& child : rEle.m_aChildren)
    {
        if( child > 0 && child < sal_Int32(m_aStructure.size()) )
        {
            PDFStructureElement& rChild = m_aStructure[ child ];
            if( rChild.m_eType != PDFWriter::NonStructElement )
            {
                if( rChild.m_nParentElement == rEle.m_nOwnElement )
                    emitStructure( rChild );
                else
                {
                    OSL_FAIL( "PDFWriterImpl::emitStructure: invalid child structure element" );
                    SAL_INFO("vcl.pdfwriter", "PDFWriterImpl::emitStructure: invalid child structure element with id " << child);
                }
            }
        }
        else
        {
            OSL_FAIL( "PDFWriterImpl::emitStructure: invalid child structure id" );
            SAL_INFO("vcl.pdfwriter", "PDFWriterImpl::emitStructure: invalid child structure id " << child);
        }
    }

    OStringBuffer aLine( 512 );
    aLine.append( rEle.m_nObject );
    aLine.append( " 0 obj\n"
                  "<</Type" );
    sal_Int32 nParentTree = -1;
    if( rEle.m_nOwnElement == rEle.m_nParentElement )
    {
        nParentTree = createObject();
        CHECK_RETURN( nParentTree );
        aLine.append( "/StructTreeRoot\n" );
        aLine.append( "/ParentTree " );
        aLine.append( nParentTree );
        aLine.append( " 0 R\n" );
        if( ! m_aRoleMap.empty() )
        {
            aLine.append( "/RoleMap<<" );
            for (auto const& role : m_aRoleMap)
            {
                aLine.append( '/' );
                aLine.append(role.first);
                aLine.append( '/' );
                aLine.append( role.second );
                aLine.append( '\n' );
            }
            aLine.append( ">>\n" );
        }
    }
    else
    {
        aLine.append( "/StructElem\n"
                      "/S/" );
        if( !rEle.m_aAlias.isEmpty() )
            aLine.append( rEle.m_aAlias );
        else
            aLine.append( getStructureTag( rEle.m_eType ) );
        aLine.append( "\n"
                      "/P " );
        aLine.append( m_aStructure[ rEle.m_nParentElement ].m_nObject );
        aLine.append( " 0 R\n"
                      "/Pg " );
        aLine.append( rEle.m_nFirstPageObject );
        aLine.append( " 0 R\n" );
        if( !rEle.m_aActualText.isEmpty() )
        {
            aLine.append( "/ActualText" );
            appendUnicodeTextStringEncrypt( rEle.m_aActualText, rEle.m_nObject, aLine );
            aLine.append( "\n" );
        }
        if( !rEle.m_aAltText.isEmpty() )
        {
            aLine.append( "/Alt" );
            appendUnicodeTextStringEncrypt( rEle.m_aAltText, rEle.m_nObject, aLine );
            aLine.append( "\n" );
        }
    }
    if( (! rEle.m_aBBox.IsEmpty()) || (! rEle.m_aAttributes.empty()) )
    {
        OString aAttribs =  emitStructureAttributes( rEle );
        if( !aAttribs.isEmpty() )
        {
            aLine.append( "/A" );
            aLine.append( aAttribs );
            aLine.append( "\n" );
        }
    }
    if( !rEle.m_aLocale.Language.isEmpty() )
    {
        /* PDF allows only RFC 3066, which is only partly BCP 47 and does not
         * include script tags and others.
         * http://pdf.editme.com/pdfua-naturalLanguageSpecification
         * http://partners.adobe.com/public/developer/en/pdf/PDFReference16.pdf#page=886
         * https://www.adobe.com/content/dam/Adobe/en/devnet/pdf/pdfs/PDF32000_2008.pdf#M13.9.19332.1Heading.97.Natural.Language.Specification
         * */
        LanguageTag aLanguageTag( rEle.m_aLocale);
        OUString aLanguage, aScript, aCountry;
        aLanguageTag.getIsoLanguageScriptCountry( aLanguage, aScript, aCountry);
        if (!aLanguage.isEmpty())
        {
            OUStringBuffer aLocBuf( 16 );
            aLocBuf.append( aLanguage );
            if( !aCountry.isEmpty() )
            {
                aLocBuf.append( '-' );
                aLocBuf.append( aCountry );
            }
            aLine.append( "/Lang" );
            appendLiteralStringEncrypt( aLocBuf.makeStringAndClear(), rEle.m_nObject, aLine );
            aLine.append( "\n" );
        }
    }
    if( ! rEle.m_aKids.empty() )
    {
        unsigned int i = 0;
        aLine.append( "/K[" );
        for (auto const& kid : rEle.m_aKids)
        {
            if( kid.nMCID == -1 )
            {
                aLine.append( kid.nObject );
                aLine.append( " 0 R" );
                aLine.append( ( (i & 15) == 15 ) ? "\n" : " " );
            }
            else
            {
                if( kid.nObject == rEle.m_nFirstPageObject )
                {
                    aLine.append( kid.nMCID );
                    aLine.append( " " );
                }
                else
                {
                    aLine.append( "<</Type/MCR/Pg " );
                    aLine.append( kid.nObject );
                    aLine.append( " 0 R /MCID " );
                    aLine.append( kid.nMCID );
                    aLine.append( ">>\n" );
                }
            }
            ++i;
        }
        aLine.append( "]\n" );
    }
    aLine.append( ">>\nendobj\n\n" );

    CHECK_RETURN( updateObject( rEle.m_nObject ) );
    CHECK_RETURN( writeBuffer( aLine.getStr(), aLine.getLength() ) );

    CHECK_RETURN( emitStructParentTree( nParentTree ) );

    return rEle.m_nObject;
}

bool PDFWriterImpl::emitGradients()
{
    for (auto const& gradient : m_aGradients)
    {
        if ( !writeGradientFunction( gradient ) ) return false;
    }
    return true;
}

bool PDFWriterImpl::emitTilings()
{
    OStringBuffer aTilingObj( 1024 );

    for (auto & tiling : m_aTilings)
    {
        SAL_WARN_IF( !tiling.m_pTilingStream, "vcl.pdfwriter", "tiling without stream" );
        if( ! tiling.m_pTilingStream )
            continue;

        aTilingObj.setLength( 0 );

        if (g_bDebugDisableCompression)
        {
            emitComment( "PDFWriterImpl::emitTilings" );
        }

        sal_Int32 nX = static_cast<sal_Int32>(tiling.m_aRectangle.Left());
        sal_Int32 nY = static_cast<sal_Int32>(tiling.m_aRectangle.Top());
        sal_Int32 nW = static_cast<sal_Int32>(tiling.m_aRectangle.GetWidth());
        sal_Int32 nH = static_cast<sal_Int32>(tiling.m_aRectangle.GetHeight());
        if( tiling.m_aCellSize.Width() == 0 )
            tiling.m_aCellSize.setWidth( nW );
        if( tiling.m_aCellSize.Height() == 0 )
            tiling.m_aCellSize.setHeight( nH );

        bool bDeflate = compressStream( tiling.m_pTilingStream.get() );
        sal_uInt64 const nTilingStreamSize = tiling.m_pTilingStream->TellEnd();
        tiling.m_pTilingStream->Seek( STREAM_SEEK_TO_BEGIN );

        // write pattern object
        aTilingObj.append( tiling.m_nObject );
        aTilingObj.append( " 0 obj\n" );
        aTilingObj.append( "<</Type/Pattern/PatternType 1\n"
                           "/PaintType 1\n"
                           "/TilingType 2\n"
                           "/BBox[" );
        appendFixedInt( nX, aTilingObj );
        aTilingObj.append( ' ' );
        appendFixedInt( nY, aTilingObj );
        aTilingObj.append( ' ' );
        appendFixedInt( nX+nW, aTilingObj );
        aTilingObj.append( ' ' );
        appendFixedInt( nY+nH, aTilingObj );
        aTilingObj.append( "]\n"
                           "/XStep " );
        appendFixedInt( tiling.m_aCellSize.Width(), aTilingObj );
        aTilingObj.append( "\n"
                           "/YStep " );
        appendFixedInt( tiling.m_aCellSize.Height(), aTilingObj );
        aTilingObj.append( "\n" );
        if( tiling.m_aTransform.matrix[0] != 1.0 ||
            tiling.m_aTransform.matrix[1] != 0.0 ||
            tiling.m_aTransform.matrix[3] != 0.0 ||
            tiling.m_aTransform.matrix[4] != 1.0 ||
            tiling.m_aTransform.matrix[2] != 0.0 ||
            tiling.m_aTransform.matrix[5] != 0.0 )
        {
            aTilingObj.append( "/Matrix [" );
            // TODO: scaling, mirroring on y, etc
            appendDouble( tiling.m_aTransform.matrix[0], aTilingObj );
            aTilingObj.append( ' ' );
            appendDouble( tiling.m_aTransform.matrix[1], aTilingObj );
            aTilingObj.append( ' ' );
            appendDouble( tiling.m_aTransform.matrix[3], aTilingObj );
            aTilingObj.append( ' ' );
            appendDouble( tiling.m_aTransform.matrix[4], aTilingObj );
            aTilingObj.append( ' ' );
            appendDouble( tiling.m_aTransform.matrix[2], aTilingObj );
            aTilingObj.append( ' ' );
            appendDouble( tiling.m_aTransform.matrix[5], aTilingObj );
            aTilingObj.append( "]\n" );
        }
        aTilingObj.append( "/Resources" );
        tiling.m_aResources.append( aTilingObj, getFontDictObject() );
        if( bDeflate )
            aTilingObj.append( "/Filter/FlateDecode" );
        aTilingObj.append( "/Length " );
        aTilingObj.append( static_cast<sal_Int32>(nTilingStreamSize) );
        aTilingObj.append( ">>\nstream\n" );
        if ( !updateObject( tiling.m_nObject ) ) return false;
        if ( !writeBuffer( aTilingObj.getStr(), aTilingObj.getLength() ) ) return false;
        checkAndEnableStreamEncryption( tiling.m_nObject );
        bool written = writeBuffer( tiling.m_pTilingStream->GetData(), nTilingStreamSize );
        tiling.m_pTilingStream.reset();
        if( !written )
            return false;
        disableStreamEncryption();
        aTilingObj.setLength( 0 );
        aTilingObj.append( "\nendstream\nendobj\n\n" );
        if ( !writeBuffer( aTilingObj.getStr(), aTilingObj.getLength() ) ) return false;
    }
    return true;
}

sal_Int32 PDFWriterImpl::emitBuildinFont(const pdf::BuildinFontFace* pFD, sal_Int32 nFontObject)
{
    if( !pFD )
        return 0;
    const pdf::BuildinFont& rBuildinFont = pFD->GetBuildinFont();

    OStringBuffer aLine( 1024 );

    if( nFontObject <= 0 )
        nFontObject = createObject();
    CHECK_RETURN( updateObject( nFontObject ) );
    aLine.append( nFontObject );
    aLine.append( " 0 obj\n"
                  "<</Type/Font/Subtype/Type1/BaseFont/" );
    appendName( rBuildinFont.m_pPSName, aLine );
    aLine.append( "\n" );
    if( rBuildinFont.m_eCharSet == RTL_TEXTENCODING_MS_1252 )
         aLine.append( "/Encoding/WinAnsiEncoding\n" );
    aLine.append( ">>\nendobj\n\n" );
    CHECK_RETURN( writeBuffer( aLine.getStr(), aLine.getLength() ) );
    return nFontObject;
}

std::map< sal_Int32, sal_Int32 > PDFWriterImpl::emitSystemFont( const PhysicalFontFace* pFont, EmbedFont const & rEmbed )
{
    std::map< sal_Int32, sal_Int32 > aRet;

    sal_Int32 nFontDescriptor = 0;
    OString aSubType( "/Type1" );
    FontSubsetInfo aInfo;
    // fill in dummy values
    aInfo.m_nAscent = 1000;
    aInfo.m_nDescent = 200;
    aInfo.m_nCapHeight = 1000;
    aInfo.m_aFontBBox = tools::Rectangle( Point( -200, -200 ), Size( 1700, 1700 ) );
    aInfo.m_aPSName = pFont->GetFamilyName();
    sal_Int32 pWidths[256] = {};

    SalGraphics *pGraphics = GetGraphics();

    assert(pGraphics);

    aSubType = OString( "/TrueType" );
    std::vector< sal_Int32 > aGlyphWidths;
    Ucs2UIntMap aUnicodeMap;
    pGraphics->GetGlyphWidths( pFont, false, aGlyphWidths, aUnicodeMap );

    OUString aTmpName;
    osl_createTempFile( nullptr, nullptr, &aTmpName.pData );
    sal_GlyphId aGlyphIds[ 256 ] = {};
    sal_uInt8 pEncoding[ 256 ] = {};
    sal_Int32 pDuWidths[ 256 ] = {};

    for( sal_Ucs c = 32; c < 256; c++ )
    {
        pEncoding[c] = c;
        aGlyphIds[c] = 0;
        if( aUnicodeMap.find( c ) != aUnicodeMap.end() )
            pWidths[ c ] = aGlyphWidths[ aUnicodeMap[ c ] ];
    }
    //TODO: surely this is utterly broken because aGlyphIds is just all zeros, if we
    //had the right glyphids here then I imagine we could replace pDuWidths with
    //pWidths and remove pWidths assignment above. i.e. start with the glyph ids
    //and map those to unicode rather than try and reverse map them ?
    pGraphics->CreateFontSubset( aTmpName, pFont, aGlyphIds, pEncoding, pDuWidths, 256, aInfo );
    osl_removeFile( aTmpName.pData );

    // write font descriptor
    nFontDescriptor = emitFontDescriptor( pFont, aInfo, 0, 0 );
    if( nFontDescriptor )
    {
        // write font object
        sal_Int32 nObject = createObject();
        if( updateObject( nObject ) )
        {
            OStringBuffer aLine( 1024 );
            aLine.append( nObject );
            aLine.append( " 0 obj\n"
                          "<</Type/Font/Subtype" );
            aLine.append( aSubType );
            aLine.append( "/BaseFont/" );
            appendName( aInfo.m_aPSName, aLine );
            aLine.append( "\n" );
            if( !pFont->IsSymbolFont() )
                aLine.append( "/Encoding/WinAnsiEncoding\n" );
            aLine.append( "/FirstChar 32 /LastChar 255\n"
                          "/Widths[" );
            for( int i = 32; i < 256; i++ )
            {
                aLine.append( pWidths[i] );
                aLine.append( ((i&15) == 15) ? "\n" : " " );
            }
            aLine.append( "]\n"
                          "/FontDescriptor " );
            aLine.append( nFontDescriptor );
            aLine.append( " 0 R>>\n"
                          "endobj\n\n" );
            writeBuffer( aLine.getStr(), aLine.getLength() );

            aRet[ rEmbed.m_nNormalFontID ] = nObject;
        }
    }

    return aRet;
}

typedef int ThreeInts[3];
static bool getPfbSegmentLengths( const unsigned char* pFontBytes, int nByteLen,
    ThreeInts& rSegmentLengths )
{
    if( !pFontBytes || (nByteLen < 0) )
        return false;
    const unsigned char* pPtr = pFontBytes;
    const unsigned char* pEnd = pFontBytes + nByteLen;

    for(int & rSegmentLength : rSegmentLengths) {
        // read segment1 header
        if( pPtr+6 >= pEnd )
            return false;
        if( (pPtr[0] != 0x80) || (pPtr[1] >= 0x03) )
            return false;
        const int nLen = (pPtr[5]<<24) + (pPtr[4]<<16) + (pPtr[3]<<8) + pPtr[2];
        if( nLen <= 0)
            return false;
        rSegmentLength = nLen;
        pPtr += nLen + 6;
    }

    // read segment-end header
    if( pPtr+2 >= pEnd )
        return false;
    if( (pPtr[0] != 0x80) || (pPtr[1] != 0x03) )
        return false;

    return true;
}

static void appendSubsetName( int nSubsetID, const OUString& rPSName, OStringBuffer& rBuffer )
{
    if( nSubsetID )
    {
        for( int i = 0; i < 6; i++ )
        {
            int nOffset = nSubsetID % 26;
            nSubsetID /= 26;
            rBuffer.append( static_cast<char>('A'+nOffset) );
        }
        rBuffer.append( '+' );
    }
    appendName( rPSName, rBuffer );
}

sal_Int32 PDFWriterImpl::createToUnicodeCMap( sal_uInt8 const * pEncoding,
                                              const sal_Ucs* pCodeUnits,
                                              const sal_Int32* pCodeUnitsPerGlyph,
                                              const sal_Int32* pEncToUnicodeIndex,
                                              int nGlyphs )
{
    int nMapped = 0;
    for (int n = 0; n < nGlyphs; ++n)
        if( pCodeUnits[pEncToUnicodeIndex[n]] && pCodeUnitsPerGlyph[n] )
            nMapped++;

    if( nMapped == 0 )
        return 0;

    sal_Int32 nStream = createObject();
    CHECK_RETURN( updateObject( nStream ) );

    OStringBuffer aContents( 1024 );
    aContents.append(
                     "/CIDInit/ProcSet findresource begin\n"
                     "12 dict begin\n"
                     "begincmap\n"
                     "/CIDSystemInfo<<\n"
                     "/Registry (Adobe)\n"
                     "/Ordering (UCS)\n"
                     "/Supplement 0\n"
                     ">> def\n"
                     "/CMapName/Adobe-Identity-UCS def\n"
                     "/CMapType 2 def\n"
                     "1 begincodespacerange\n"
                     "<00> <FF>\n"
                     "endcodespacerange\n"
                     );
    int nCount = 0;
    for (int n = 0; n < nGlyphs; ++n)
    {
        if( pCodeUnits[pEncToUnicodeIndex[n]] && pCodeUnitsPerGlyph[n] )
        {
            if( (nCount % 100) == 0 )
            {
                if( nCount )
                    aContents.append( "endbfchar\n" );
                aContents.append( static_cast<sal_Int32>(std::min(nMapped-nCount, 100)) );
                aContents.append( " beginbfchar\n" );
            }
            aContents.append( '<' );
            appendHex( static_cast<sal_Int8>(pEncoding[n]), aContents );
            aContents.append( "> <" );
            // TODO: handle code points>U+FFFF
            sal_Int32 nIndex = pEncToUnicodeIndex[n];
            for( sal_Int32 j = 0; j < pCodeUnitsPerGlyph[n]; j++ )
            {
                appendHex( static_cast<sal_Int8>(pCodeUnits[nIndex + j] / 256), aContents );
                appendHex( static_cast<sal_Int8>(pCodeUnits[nIndex + j] & 255), aContents );
            }
            aContents.append( ">\n" );
            nCount++;
        }
    }
    aContents.append( "endbfchar\n"
                      "endcmap\n"
                      "CMapName currentdict /CMap defineresource pop\n"
                      "end\n"
                      "end\n" );
    SvMemoryStream aStream;
    if (!g_bDebugDisableCompression)
    {
        ZCodec aCodec( 0x4000, 0x4000 );
        aCodec.BeginCompression();
        aCodec.Write( aStream, reinterpret_cast<const sal_uInt8*>(aContents.getStr()), aContents.getLength() );
        aCodec.EndCompression();
    }

    if (g_bDebugDisableCompression)
    {
        emitComment( "PDFWriterImpl::createToUnicodeCMap" );
    }
    OStringBuffer aLine( 40 );

    aLine.append( nStream );
    aLine.append( " 0 obj\n<</Length " );
    sal_Int32 nLen = 0;
    if (!g_bDebugDisableCompression)
    {
        nLen = static_cast<sal_Int32>(aStream.Tell());
        aStream.Seek( 0 );
        aLine.append( nLen );
        aLine.append( "/Filter/FlateDecode" );
    }
    else
        aLine.append( aContents.getLength() );
    aLine.append( ">>\nstream\n" );
    CHECK_RETURN( writeBuffer( aLine.getStr(), aLine.getLength() ) );
    checkAndEnableStreamEncryption( nStream );
    if (!g_bDebugDisableCompression)
    {
        CHECK_RETURN( writeBuffer( aStream.GetData(), nLen ) );
    }
    else
    {
        CHECK_RETURN( writeBuffer( aContents.getStr(), aContents.getLength() ) );
    }
    disableStreamEncryption();
    aLine.setLength( 0 );
    aLine.append( "\nendstream\n"
                  "endobj\n\n" );
    CHECK_RETURN( writeBuffer( aLine.getStr(), aLine.getLength() ) );
    return nStream;
}

sal_Int32 PDFWriterImpl::emitFontDescriptor( const PhysicalFontFace* pFont, FontSubsetInfo const & rInfo, sal_Int32 nSubsetID, sal_Int32 nFontStream )
{
    OStringBuffer aLine( 1024 );
    // get font flags, see PDF reference 1.4 p. 358
    // possibly characters outside Adobe standard encoding
    // so set Symbolic flag
    sal_Int32 nFontFlags = (1<<2);
    if( pFont->GetItalic() == ITALIC_NORMAL || pFont->GetItalic() == ITALIC_OBLIQUE )
        nFontFlags |= (1 << 6);
    if( pFont->GetPitch() == PITCH_FIXED )
        nFontFlags |= 1;
    if( pFont->GetFamilyType() == FAMILY_SCRIPT )
        nFontFlags |= (1 << 3);
    else if( pFont->GetFamilyType() == FAMILY_ROMAN )
        nFontFlags |= (1 << 1);

    sal_Int32 nFontDescriptor = createObject();
    CHECK_RETURN( updateObject( nFontDescriptor ) );
    aLine.setLength( 0 );
    aLine.append( nFontDescriptor );
    aLine.append( " 0 obj\n"
                  "<</Type/FontDescriptor/FontName/" );
    appendSubsetName( nSubsetID, rInfo.m_aPSName, aLine );
    aLine.append( "\n"
                  "/Flags " );
    aLine.append( nFontFlags );
    aLine.append( "\n"
                  "/FontBBox[" );
    // note: Top and Bottom are reversed in VCL and PDF rectangles
    aLine.append( static_cast<sal_Int32>(rInfo.m_aFontBBox.TopLeft().X()) );
    aLine.append( ' ' );
    aLine.append( static_cast<sal_Int32>(rInfo.m_aFontBBox.TopLeft().Y()) );
    aLine.append( ' ' );
    aLine.append( static_cast<sal_Int32>(rInfo.m_aFontBBox.BottomRight().X()) );
    aLine.append( ' ' );
    aLine.append( static_cast<sal_Int32>(rInfo.m_aFontBBox.BottomRight().Y()+1) );
    aLine.append( "]/ItalicAngle " );
    if( pFont->GetItalic() == ITALIC_OBLIQUE || pFont->GetItalic() == ITALIC_NORMAL )
        aLine.append( "-30" );
    else
        aLine.append( "0" );
    aLine.append( "\n"
                  "/Ascent " );
    aLine.append( static_cast<sal_Int32>(rInfo.m_nAscent) );
    aLine.append( "\n"
                  "/Descent " );
    aLine.append( static_cast<sal_Int32>(-rInfo.m_nDescent) );
    aLine.append( "\n"
                  "/CapHeight " );
    aLine.append( static_cast<sal_Int32>(rInfo.m_nCapHeight) );
    // According to PDF reference 1.4 StemV is required
    // seems a tad strange to me, but well ...
    aLine.append( "\n"
                  "/StemV 80\n" );
    if( nFontStream )
    {
        aLine.append( "/FontFile" );
        switch( rInfo.m_nFontType )
        {
            case FontType::SFNT_TTF:
                aLine.append( '2' );
                break;
            case FontType::TYPE1_PFA:
            case FontType::TYPE1_PFB:
            case FontType::ANY_TYPE1:
                break;
            default:
                OSL_FAIL( "unknown fonttype in PDF font descriptor" );
                return 0;
        }
        aLine.append( ' ' );
        aLine.append( nFontStream );
        aLine.append( " 0 R\n" );
    }
    aLine.append( ">>\n"
                  "endobj\n\n" );
    CHECK_RETURN( writeBuffer( aLine.getStr(), aLine.getLength() ) );

    return nFontDescriptor;
}

void PDFWriterImpl::appendBuildinFontsToDict( OStringBuffer& rDict ) const
{
    for (auto const& item : m_aBuildinFontToObjectMap)
    {
        rDict.append( pdf::BuildinFontFace::Get(item.first).getNameObject() );
        rDict.append( ' ' );
        rDict.append( item.second );
        rDict.append( " 0 R" );
    }
}

bool PDFWriterImpl::emitFonts()
{
    SalGraphics *pGraphics = GetGraphics();

    if (!pGraphics)
        return false;

    OStringBuffer aLine( 1024 );

    std::map< sal_Int32, sal_Int32 > aFontIDToObject;

    OUString aTmpName;
    osl_createTempFile( nullptr, nullptr, &aTmpName.pData );
    for (const auto & subset : m_aSubsets)
    {
        for (auto & s_subset :subset.second.m_aSubsets)
        {
            sal_GlyphId aGlyphIds[ 256 ] = {};
            sal_Int32 pWidths[ 256 ];
            sal_uInt8 pEncoding[ 256 ] = {};
            sal_Int32 pEncToUnicodeIndex[ 256 ] = {};
            sal_Int32 pCodeUnitsPerGlyph[ 256 ] = {};
            std::vector<sal_Ucs> aCodeUnits;
            aCodeUnits.reserve( 256 );
            int nGlyphs = 1;
            // fill arrays and prepare encoding index map
            sal_Int32 nToUnicodeStream = 0;

            for (auto const& item : s_subset.m_aMapping)
            {
                sal_uInt8 nEnc = item.second.getGlyphId();

                SAL_WARN_IF( aGlyphIds[nEnc] != 0 || pEncoding[nEnc] != 0, "vcl.pdfwriter", "duplicate glyph" );
                SAL_WARN_IF( nEnc > s_subset.m_aMapping.size(), "vcl.pdfwriter", "invalid glyph encoding" );

                aGlyphIds[ nEnc ] = item.first;
                pEncoding[ nEnc ] = nEnc;
                pEncToUnicodeIndex[ nEnc ] = static_cast<sal_Int32>(aCodeUnits.size());
                pCodeUnitsPerGlyph[ nEnc ] = item.second.countCodes();
                for( sal_Int32 n = 0; n < pCodeUnitsPerGlyph[ nEnc ]; n++ )
                    aCodeUnits.push_back( item.second.getCode( n ) );
                if( item.second.getCode(0) )
                    nToUnicodeStream = 1;
                if( nGlyphs < 256 )
                    nGlyphs++;
                else
                {
                    OSL_FAIL( "too many glyphs for subset" );
                }
            }
            FontSubsetInfo aSubsetInfo;
            if( pGraphics->CreateFontSubset( aTmpName, subset.first, aGlyphIds, pEncoding, pWidths, nGlyphs, aSubsetInfo ) )
            {
                // create font stream
                osl::File aFontFile(aTmpName);
                if (osl::File::E_None != aFontFile.open(osl_File_OpenFlag_Read)) return false;
                // get file size
                sal_uInt64 nLength1;
                if ( osl::File::E_None != aFontFile.setPos(osl_Pos_End, 0) ) return false;
                if ( osl::File::E_None != aFontFile.getPos(nLength1) ) return false;
                if ( osl::File::E_None != aFontFile.setPos(osl_Pos_Absolut, 0) ) return false;

                if (g_bDebugDisableCompression)
                {
                    emitComment( "PDFWriterImpl::emitFonts" );
                }
                sal_Int32 nFontStream = createObject();
                sal_Int32 nStreamLengthObject = createObject();
                if ( !updateObject( nFontStream ) ) return false;
                aLine.setLength( 0 );
                aLine.append( nFontStream );
                aLine.append( " 0 obj\n"
                             "<</Length " );
                aLine.append( nStreamLengthObject );
                if (!g_bDebugDisableCompression)
                    aLine.append( " 0 R"
                                 "/Filter/FlateDecode"
                                 "/Length1 " );
                else
                    aLine.append( " 0 R"
                                 "/Length1 " );

                sal_uInt64 nStartPos = 0;
                if( aSubsetInfo.m_nFontType == FontType::SFNT_TTF )
                {
                    aLine.append( static_cast<sal_Int32>(nLength1) );

                    aLine.append( ">>\n"
                                 "stream\n" );
                    if ( !writeBuffer( aLine.getStr(), aLine.getLength() ) ) return false;
                    if ( osl::File::E_None != m_aFile.getPos(nStartPos) ) return false;

                    // copy font file
                    beginCompression();
                    checkAndEnableStreamEncryption( nFontStream );
                    sal_Bool bEOF = false;
                    do
                    {
                        char buf[8192];
                        sal_uInt64 nRead;
                        if ( osl::File::E_None != aFontFile.read(buf, sizeof(buf), nRead) ) return false;
                        if ( !writeBuffer( buf, nRead ) ) return false;
                        if ( osl::File::E_None != aFontFile.isEndOfFile(&bEOF) ) return false;
                    } while( ! bEOF );
                }
                else if( aSubsetInfo.m_nFontType & FontType::CFF_FONT)
                {
                    // TODO: implement
                    OSL_FAIL( "PDFWriterImpl does not support CFF-font subsets yet!" );
                }
                else if( aSubsetInfo.m_nFontType & FontType::TYPE1_PFB) // TODO: also support PFA?
                {
                    std::unique_ptr<unsigned char[]> xBuffer(new unsigned char[nLength1]);

                    sal_uInt64 nBytesRead = 0;
                    if ( osl::File::E_None != aFontFile.read(xBuffer.get(), nLength1, nBytesRead) ) return false;
                    SAL_WARN_IF( nBytesRead!=nLength1, "vcl.pdfwriter", "PDF-FontSubset read incomplete!" );
                    if ( osl::File::E_None != aFontFile.setPos(osl_Pos_Absolut, 0) ) return false;
                    // get the PFB-segment lengths
                    ThreeInts aSegmentLengths = {0,0,0};
                    getPfbSegmentLengths(xBuffer.get(), static_cast<int>(nBytesRead), aSegmentLengths);
                    // the lengths below are mandatory for PDF-exported Type1 fonts
                    // because the PFB segment headers get stripped! WhyOhWhy.
                    aLine.append( static_cast<sal_Int32>(aSegmentLengths[0]) );
                    aLine.append( "/Length2 " );
                    aLine.append( static_cast<sal_Int32>(aSegmentLengths[1]) );
                    aLine.append( "/Length3 " );
                    aLine.append( static_cast<sal_Int32>(aSegmentLengths[2]) );

                    aLine.append( ">>\n"
                                 "stream\n" );
                    if ( !writeBuffer( aLine.getStr(), aLine.getLength() ) ) return false;
                    if ( osl::File::E_None != m_aFile.getPos(nStartPos) ) return false;

                    // emit PFB-sections without section headers
                    beginCompression();
                    checkAndEnableStreamEncryption( nFontStream );
                    if ( !writeBuffer( &xBuffer[6], aSegmentLengths[0] ) ) return false;
                    if ( !writeBuffer( &xBuffer[12] + aSegmentLengths[0], aSegmentLengths[1] ) ) return false;
                    if ( !writeBuffer( &xBuffer[18] + aSegmentLengths[0] + aSegmentLengths[1], aSegmentLengths[2] ) ) return false;
                }
                else
                {
                    SAL_INFO("vcl.pdfwriter", "PDF: CreateFontSubset result in not yet supported format=" << static_cast<int>(aSubsetInfo.m_nFontType));
                    aLine.append( "0 >>\nstream\n" );
                }

                endCompression();
                disableStreamEncryption();
                // close the file
                aFontFile.close();

                sal_uInt64 nEndPos = 0;
                if ( osl::File::E_None != m_aFile.getPos(nEndPos) ) return false;
                // end the stream
                aLine.setLength( 0 );
                aLine.append( "\nendstream\nendobj\n\n" );
                if ( !writeBuffer( aLine.getStr(), aLine.getLength() ) ) return false;

                // emit stream length object
                if ( !updateObject( nStreamLengthObject ) ) return false;
                aLine.setLength( 0 );
                aLine.append( nStreamLengthObject );
                aLine.append( " 0 obj\n" );
                aLine.append( static_cast<sal_Int64>(nEndPos-nStartPos) );
                aLine.append( "\nendobj\n\n" );
                if ( !writeBuffer( aLine.getStr(), aLine.getLength() ) ) return false;

                // write font descriptor
                sal_Int32 nFontDescriptor = emitFontDescriptor( subset.first, aSubsetInfo, s_subset.m_nFontID, nFontStream );

                if( nToUnicodeStream )
                    nToUnicodeStream = createToUnicodeCMap( pEncoding, aCodeUnits.data(), pCodeUnitsPerGlyph, pEncToUnicodeIndex, nGlyphs );

                sal_Int32 nFontObject = createObject();
                if ( !updateObject( nFontObject ) ) return false;
                aLine.setLength( 0 );
                aLine.append( nFontObject );

                aLine.append( " 0 obj\n" );
                aLine.append( (aSubsetInfo.m_nFontType & FontType::ANY_TYPE1) ?
                             "<</Type/Font/Subtype/Type1/BaseFont/" :
                             "<</Type/Font/Subtype/TrueType/BaseFont/" );
                appendSubsetName( s_subset.m_nFontID, aSubsetInfo.m_aPSName, aLine );
                aLine.append( "\n"
                             "/FirstChar 0\n"
                             "/LastChar " );
                aLine.append( static_cast<sal_Int32>(nGlyphs-1) );
                aLine.append( "\n"
                             "/Widths[" );
                for( int i = 0; i < nGlyphs; i++ )
                {
                    aLine.append( pWidths[ i ] );
                    aLine.append( ((i & 15) == 15) ? "\n" : " " );
                }
                aLine.append( "]\n"
                             "/FontDescriptor " );
                aLine.append( nFontDescriptor );
                aLine.append( " 0 R\n" );
                if( nToUnicodeStream )
                {
                    aLine.append( "/ToUnicode " );
                    aLine.append( nToUnicodeStream );
                    aLine.append( " 0 R\n" );
                }
                aLine.append( ">>\n"
                             "endobj\n\n" );
                if ( !writeBuffer( aLine.getStr(), aLine.getLength() ) ) return false;

                aFontIDToObject[ s_subset.m_nFontID ] = nFontObject;
            }
            else
            {
                const PhysicalFontFace* pFont = subset.first;
                OStringBuffer aErrorComment( 256 );
                aErrorComment.append( "CreateFontSubset failed for font \"" );
                aErrorComment.append( OUStringToOString( pFont->GetFamilyName(), RTL_TEXTENCODING_UTF8 ) );
                aErrorComment.append( '\"' );
                if( pFont->GetItalic() == ITALIC_NORMAL )
                    aErrorComment.append( " italic" );
                else if( pFont->GetItalic() == ITALIC_OBLIQUE )
                    aErrorComment.append( " oblique" );
                aErrorComment.append( " weight=" );
                aErrorComment.append( sal_Int32(pFont->GetWeight()) );
                emitComment( aErrorComment.getStr() );
            }
        }
    }
    osl_removeFile( aTmpName.pData );

    // emit system fonts
    for (auto const& systemFont : m_aSystemFonts)
    {
        std::map< sal_Int32, sal_Int32 > aObjects = emitSystemFont( systemFont.first, systemFont.second );
        for (auto const& item : aObjects)
        {
            if ( !item.second ) return false;
            aFontIDToObject[ item.first ] = item.second;
        }
    }

    OStringBuffer aFontDict( 1024 );
    aFontDict.append( getFontDictObject() );
    aFontDict.append( " 0 obj\n"
                     "<<" );
    int ni = 0;
    for (auto const& itemMap : aFontIDToObject)
    {
        aFontDict.append( "/F" );
        aFontDict.append( itemMap.first );
        aFontDict.append( ' ' );
        aFontDict.append( itemMap.second );
        aFontDict.append( " 0 R" );
        if( ((++ni) & 7) == 0 )
            aFontDict.append( '\n' );
    }
    // emit builtin font for widget appearances / variable text
    for (auto & item : m_aBuildinFontToObjectMap)
    {
        rtl::Reference<pdf::BuildinFontFace> aData(new pdf::BuildinFontFace(item.first));
        item.second = emitBuildinFont( aData.get(), item.second );
    }

    appendBuildinFontsToDict(aFontDict);
    aFontDict.append( "\n>>\nendobj\n\n" );

    if ( !updateObject( getFontDictObject() ) ) return false;
    if ( !writeBuffer( aFontDict.getStr(), aFontDict.getLength() ) ) return false;
    return true;
}

sal_Int32 PDFWriterImpl::emitResources()
{
    // emit shadings
    if( ! m_aGradients.empty() )
        CHECK_RETURN( emitGradients() );
    // emit tilings
    if( ! m_aTilings.empty() )
        CHECK_RETURN( emitTilings() );

    // emit font dict
    CHECK_RETURN( emitFonts() );

    // emit Resource dict
    OStringBuffer aLine( 512 );
    sal_Int32 nResourceDict = getResourceDictObj();
    CHECK_RETURN( updateObject( nResourceDict ) );
    aLine.setLength( 0 );
    aLine.append( nResourceDict );
    aLine.append( " 0 obj\n" );
    m_aGlobalResourceDict.append( aLine, getFontDictObject() );
    aLine.append( "endobj\n\n" );
    CHECK_RETURN( writeBuffer( aLine.getStr(), aLine.getLength() ) );
    return nResourceDict;
}

sal_Int32 PDFWriterImpl::updateOutlineItemCount( std::vector< sal_Int32 >& rCounts,
                                                 sal_Int32 nItemLevel,
                                                 sal_Int32 nCurrentItemId )
{
    /* The /Count number of an item is
       positive: the number of visible subitems
       negative: the negative number of subitems that will become visible if
                 the item gets opened
       see PDF ref 1.4 p 478
    */

    sal_Int32 nCount = 0;

    if( m_aContext.OpenBookmarkLevels < 0           || // all levels are visible
        m_aContext.OpenBookmarkLevels >= nItemLevel    // this level is visible
      )
    {
        PDFOutlineEntry& rItem = m_aOutline[ nCurrentItemId ];
        sal_Int32 nChildren = rItem.m_aChildren.size();
        for( sal_Int32 i = 0; i < nChildren; i++ )
            nCount += updateOutlineItemCount( rCounts, nItemLevel+1, rItem.m_aChildren[i] );
        rCounts[nCurrentItemId] = nCount;
        // return 1 (this item) + visible sub items
        if( nCount < 0 )
            nCount = 0;
        nCount++;
    }
    else
    {
        // this bookmark level is invisible
        PDFOutlineEntry& rItem = m_aOutline[ nCurrentItemId ];
        sal_Int32 nChildren = rItem.m_aChildren.size();
        rCounts[ nCurrentItemId ] = -sal_Int32(rItem.m_aChildren.size());
        for( sal_Int32 i = 0; i < nChildren; i++ )
            updateOutlineItemCount( rCounts, nItemLevel+1, rItem.m_aChildren[i] );
        nCount = -1;
    }

    return nCount;
}

sal_Int32 PDFWriterImpl::emitOutline()
{
    int i, nItems = m_aOutline.size();

    // do we have an outline at all ?
    if( nItems < 2 )
        return 0;

    // reserve object numbers for all outline items
    for( i = 0; i < nItems; ++i )
        m_aOutline[i].m_nObject = createObject();

    // update all parent, next and prev object ids
    for( i = 0; i < nItems; ++i )
    {
        PDFOutlineEntry& rItem = m_aOutline[i];
        int nChildren = rItem.m_aChildren.size();

        if( nChildren )
        {
            for( int n = 0; n < nChildren; ++n )
            {
                PDFOutlineEntry& rChild = m_aOutline[ rItem.m_aChildren[n] ];

                rChild.m_nParentObject = rItem.m_nObject;
                rChild.m_nPrevObject = (n > 0) ? m_aOutline[ rItem.m_aChildren[n-1] ].m_nObject : 0;
                rChild.m_nNextObject = (n < nChildren-1) ? m_aOutline[ rItem.m_aChildren[n+1] ].m_nObject : 0;
            }

        }
    }

    // calculate Count entries for all items
    std::vector< sal_Int32 > aCounts( nItems );
    updateOutlineItemCount( aCounts, 0, 0 );

    // emit hierarchy
    for( i = 0; i < nItems; ++i )
    {
        PDFOutlineEntry& rItem = m_aOutline[i];
        OStringBuffer aLine( 1024 );

        CHECK_RETURN( updateObject( rItem.m_nObject ) );
        aLine.append( rItem.m_nObject );
        aLine.append( " 0 obj\n" );
        aLine.append( "<<" );
        // number of visible children (all levels)
        if( i > 0 || aCounts[0] > 0 )
        {
            aLine.append( "/Count " );
            aLine.append( aCounts[i] );
        }
        if( ! rItem.m_aChildren.empty() )
        {
            // children list: First, Last
            aLine.append( "/First " );
            aLine.append( m_aOutline[rItem.m_aChildren.front()].m_nObject );
            aLine.append( " 0 R/Last " );
            aLine.append( m_aOutline[rItem.m_aChildren.back()].m_nObject );
            aLine.append( " 0 R\n" );
        }
        if( i > 0 )
        {
            // Title, Dest, Parent, Prev, Next
            aLine.append( "/Title" );
            appendUnicodeTextStringEncrypt( rItem.m_aTitle, rItem.m_nObject, aLine );
            aLine.append( "\n" );
            // Dest is not required
            if( rItem.m_nDestID >= 0 && rItem.m_nDestID < static_cast<sal_Int32>(m_aDests.size()) )
            {
                aLine.append( "/Dest" );
                appendDest( rItem.m_nDestID, aLine );
            }
            aLine.append( "/Parent " );
            aLine.append( rItem.m_nParentObject );
            aLine.append( " 0 R" );
            if( rItem.m_nPrevObject )
            {
                aLine.append( "/Prev " );
                aLine.append( rItem.m_nPrevObject );
                aLine.append( " 0 R" );
            }
            if( rItem.m_nNextObject )
            {
                aLine.append( "/Next " );
                aLine.append( rItem.m_nNextObject );
                aLine.append( " 0 R" );
            }
        }
        aLine.append( ">>\nendobj\n\n" );
        CHECK_RETURN( writeBuffer( aLine.getStr(), aLine.getLength() ) );
    }

    return m_aOutline[0].m_nObject;
}

#undef CHECK_RETURN
#define CHECK_RETURN( x ) if( !x ) return false

bool PDFWriterImpl::appendDest( sal_Int32 nDestID, OStringBuffer& rBuffer )
{
    if( nDestID < 0 || nDestID >= static_cast<sal_Int32>(m_aDests.size()) )
    {
        SAL_INFO("vcl.pdfwriter", "ERROR: invalid dest " << static_cast<int>(nDestID) << " requested");
        return false;
    }

    const PDFDest& rDest        = m_aDests[ nDestID ];
    const PDFPage& rDestPage    = m_aPages[ rDest.m_nPage ];

    rBuffer.append( '[' );
    rBuffer.append( rDestPage.m_nPageObject );
    rBuffer.append( " 0 R" );

    switch( rDest.m_eType )
    {
        case PDFWriter::DestAreaType::XYZ:
        default:
            rBuffer.append( "/XYZ " );
            appendFixedInt( rDest.m_aRect.Left(), rBuffer );
            rBuffer.append( ' ' );
            appendFixedInt( rDest.m_aRect.Bottom(), rBuffer );
            rBuffer.append( " 0" );
            break;
        case PDFWriter::DestAreaType::FitRectangle:
            rBuffer.append( "/FitR " );
            appendFixedInt( rDest.m_aRect.Left(), rBuffer );
            rBuffer.append( ' ' );
            appendFixedInt( rDest.m_aRect.Top(), rBuffer );
            rBuffer.append( ' ' );
            appendFixedInt( rDest.m_aRect.Right(), rBuffer );
            rBuffer.append( ' ' );
            appendFixedInt( rDest.m_aRect.Bottom(), rBuffer );
            break;
    }
    rBuffer.append( ']' );

    return true;
}

bool PDFWriterImpl::emitScreenAnnotations()
{
    int nAnnots = m_aScreens.size();
    for (int i = 0; i < nAnnots; i++)
    {
        const PDFScreen& rScreen = m_aScreens[i];

        OStringBuffer aLine;
        bool bEmbed = false;
        if (!rScreen.m_aTempFileURL.isEmpty())
        {
            bEmbed = true;
            if (!updateObject(rScreen.m_nTempFileObject))
                continue;

            SvFileStream aFileStream(rScreen.m_aTempFileURL, StreamMode::READ);
            SvMemoryStream aMemoryStream;
            aMemoryStream.WriteStream(aFileStream);

            aLine.append(rScreen.m_nTempFileObject);
            aLine.append(" 0 obj\n");
            aLine.append("<< /Type /EmbeddedFile /Length ");
            aLine.append(static_cast<sal_Int64>(aMemoryStream.GetSize()));
            aLine.append(" >>\nstream\n");
            CHECK_RETURN(writeBuffer(aLine.getStr(), aLine.getLength()));
            aLine.setLength(0);

            CHECK_RETURN(writeBuffer(aMemoryStream.GetData(), aMemoryStream.GetSize()));

            aLine.append("\nendstream\nendobj\n\n");
            CHECK_RETURN(writeBuffer(aLine.getStr(), aLine.getLength()));
            aLine.setLength(0);
        }

        if (!updateObject(rScreen.m_nObject))
            continue;

        // Annot dictionary.
        aLine.append(rScreen.m_nObject);
        aLine.append(" 0 obj\n");
        aLine.append("<</Type/Annot");
        aLine.append("/Subtype/Screen/Rect[");
        appendFixedInt(rScreen.m_aRect.Left(), aLine);
        aLine.append(' ');
        appendFixedInt(rScreen.m_aRect.Top(), aLine);
        aLine.append(' ');
        appendFixedInt(rScreen.m_aRect.Right(), aLine);
        aLine.append(' ');
        appendFixedInt(rScreen.m_aRect.Bottom(), aLine);
        aLine.append("]");

        // Action dictionary.
        aLine.append("/A<</Type/Action /S/Rendition /AN ");
        aLine.append(rScreen.m_nObject);
        aLine.append(" 0 R ");

        // Rendition dictionary.
        aLine.append("/R<</Type/Rendition /S/MR ");

        // MediaClip dictionary.
        aLine.append("/C<</Type/MediaClip /S/MCD ");
        if (bEmbed)
        {
            aLine.append("/D << /Type /Filespec /F (<embedded file>) /EF << /F ");
            aLine.append(rScreen.m_nTempFileObject);
            aLine.append(" 0 R >> >>");
        }
        else
        {
            // Linked.
            aLine.append("/D << /Type /Filespec /FS /URL /F ");
            appendLiteralStringEncrypt(rScreen.m_aURL, rScreen.m_nObject, aLine, osl_getThreadTextEncoding());
            aLine.append(" >>");
        }
        // Allow playing the video via a tempfile.
        aLine.append("/P <</TF (TEMPACCESS)>>");
        // Until the real MIME type (instead of application/vnd.sun.star.media) is available here.
        aLine.append("/CT (video/mp4)");
        aLine.append(">>");

        // End Rendition dictionary by requesting play/pause/stop controls.
        aLine.append("/P<</BE<</C true >>>>");
        aLine.append(">>");

        // End Action dictionary.
        aLine.append("/OP 0 >>");

        // End Annot dictionary.
        aLine.append("/P ");
        aLine.append(m_aPages[rScreen.m_nPage].m_nPageObject);
        aLine.append(" 0 R\n>>\nendobj\n\n");
        CHECK_RETURN(writeBuffer(aLine.getStr(), aLine.getLength()));
    }

    return true;
}

bool PDFWriterImpl::emitLinkAnnotations()
{
    int nAnnots = m_aLinks.size();
    for( int i = 0; i < nAnnots; i++ )
    {
        const PDFLink& rLink            = m_aLinks[i];
        if( ! updateObject( rLink.m_nObject ) )
            continue;

        OStringBuffer aLine( 1024 );
        aLine.append( rLink.m_nObject );
        aLine.append( " 0 obj\n" );
// i59651: key /F set bits Print to 1 rest to 0. We don't set NoZoom NoRotate to 1, since it's a 'should'
// see PDF 8.4.2 and ISO 19005-1:2005 6.5.3
        aLine.append( "<</Type/Annot" );
        if( m_bIsPDF_A1 || m_bIsPDF_A2 )
            aLine.append( "/F 4" );
        aLine.append( "/Subtype/Link/Border[0 0 0]/Rect[" );

        appendFixedInt( rLink.m_aRect.Left()-7, aLine );//the +7 to have a better shape of the border rectangle
        aLine.append( ' ' );
        appendFixedInt( rLink.m_aRect.Top(), aLine );
        aLine.append( ' ' );
        appendFixedInt( rLink.m_aRect.Right()+7, aLine );//the +7 to have a better shape of the border rectangle
        aLine.append( ' ' );
        appendFixedInt( rLink.m_aRect.Bottom(), aLine );
        aLine.append( "]" );
        if( rLink.m_nDest >= 0 )
        {
            aLine.append( "/Dest" );
            appendDest( rLink.m_nDest, aLine );
        }
        else
        {
/*
destination is external to the document, so
we check in the following sequence:

 if target type is neither .pdf, nor .od[tpgs], then
          check if relative or absolute and act accordingly (use URI or 'launch application' as requested)
                             end processing
 else if target is .od[tpgs]: then
      if conversion of type from od[tpgs]  to pdf is requested, convert it and this becomes the new target file
      processing continue

 if (new)target is .pdf : then
     if GotToR is requested, then
           convert the target in GoToR where the fragment of the URI is
           considered the named destination in the target file, set relative or absolute as requested
     else strip the fragment from URL and then set URI or 'launch application' as requested
*/

// FIXME: check if the decode mechanisms for URL processing throughout this implementation
// are the correct one!!

// extract target file type
            auto url(URIHelper::resolveIdnaHost(rLink.m_aURL));

            INetURLObject aDocumentURL( m_aContext.BaseURL );
            INetURLObject aTargetURL( url );
            bool bSetGoToRMode = false;
            bool    bTargetHasPDFExtension = false;
            INetProtocol eTargetProtocol = aTargetURL.GetProtocol();
            bool    bIsUNCPath = false;

            // check if the protocol is a known one, or if there is no protocol at all (on target only)
            // if there is no protocol, make the target relative to the current document directory
            // getting the needed URL information from the current document path
            if( eTargetProtocol == INetProtocol::NotValid )
            {
                if( url.getLength() > 4 && url.startsWith("\\\\\\\\"))
                {
                    bIsUNCPath = true;
                }
                else
                {
                    INetURLObject aNewBase( aDocumentURL );//duplicate document URL
                    aNewBase.removeSegment(); //remove last segment from it, obtaining the base URL of the
                                              //target document
                    aNewBase.insertName( url );
                    aTargetURL = aNewBase;//reassign the new target URL
                    //recompute the target protocol, with the new URL
                    //normal URL processing resumes
                    eTargetProtocol = aTargetURL.GetProtocol();
                }
            }

            OUString aFileExtension = aTargetURL.GetFileExtension();

            // Check if the URL ends in '/': if yes it's a directory,
            // it will be forced to a URI link.
            // possibly a malformed URI, leave it as it is, force as URI
            if( aTargetURL.hasFinalSlash() )
                m_aContext.DefaultLinkAction = PDFWriter::URIAction;

            if( !aFileExtension.isEmpty() )
            {
                if( m_aContext.ConvertOOoTargetToPDFTarget )
                {
                    bool bChangeFileExtensionToPDF = false;
                    //examine the file type (.odm .odt. .odp, odg, ods)
                    if( aFileExtension.equalsIgnoreAsciiCase( "odm" ) )
                        bChangeFileExtensionToPDF = true;
                    if( aFileExtension.equalsIgnoreAsciiCase( "odt" ) )
                        bChangeFileExtensionToPDF = true;
                    else if( aFileExtension.equalsIgnoreAsciiCase( "odp" ) )
                        bChangeFileExtensionToPDF = true;
                    else if( aFileExtension.equalsIgnoreAsciiCase( "odg" ) )
                        bChangeFileExtensionToPDF = true;
                    else if( aFileExtension.equalsIgnoreAsciiCase( "ods" ) )
                        bChangeFileExtensionToPDF = true;
                    if( bChangeFileExtensionToPDF )
                        aTargetURL.setExtension("pdf" );
                }
                //check if extension is pdf, see if GoToR should be forced
                bTargetHasPDFExtension = aTargetURL.GetFileExtension().equalsIgnoreAsciiCase( "pdf" );
                if( m_aContext.ForcePDFAction && bTargetHasPDFExtension )
                    bSetGoToRMode = true;
            }
            //prepare the URL, if relative or not
            INetProtocol eBaseProtocol = aDocumentURL.GetProtocol();
            //queue the string common to all types of actions
            aLine.append( "/A<</Type/Action/S");
            if( bIsUNCPath ) // handle Win UNC paths
            {
                aLine.append( "/Launch/Win<</F" );
                // INetURLObject is not good with UNC paths, use original path
                appendLiteralStringEncrypt( url, rLink.m_nObject, aLine, osl_getThreadTextEncoding() );
                aLine.append( ">>" );
            }
            else
            {
                bool bSetRelative = false;
                bool bFileSpec = false;
                //check if relative file link is requested and if the protocol is 'file://'
                if( m_aContext.RelFsys && eBaseProtocol == eTargetProtocol && eTargetProtocol == INetProtocol::File )
                    bSetRelative = true;

                OUString aFragment = aTargetURL.GetMark( INetURLObject::DecodeMechanism::NONE /*DecodeMechanism::WithCharset*/ ); //fragment as is,
                if( !bSetGoToRMode )
                {
                    switch( m_aContext.DefaultLinkAction )
                    {
                    default:
                    case PDFWriter::URIAction :
                    case PDFWriter::URIActionDestination :
                        aLine.append( "/URI/URI" );
                        break;
                    case PDFWriter::LaunchAction:
                        // now:
                        // if a launch action is requested and the hyperlink target has a fragment
                        // and the target file does not have a pdf extension, or it's not a 'file:://'
                        // protocol then force the uri action on it
                        // This code will permit the correct opening of application on web pages,
                        // the one that normally have fragments (but I may be wrong...)
                        // and will force the use of URI when the protocol is not file:
                        if( (!aFragment.isEmpty() && !bTargetHasPDFExtension) ||
                                        eTargetProtocol != INetProtocol::File )
                        {
                            aLine.append( "/URI/URI" );
                        }
                        else
                        {
                            aLine.append( "/Launch/F" );
                            bFileSpec = true;
                        }
                        break;
                    }
                }

                //fragment are encoded in the same way as in the named destination processing
                if( bSetGoToRMode )
                {
                    //add the fragment
                    OUString aURLNoMark = aTargetURL.GetURLNoMark( INetURLObject::DecodeMechanism::WithCharset );
                    aLine.append("/GoToR");
                    aLine.append("/F");
                    appendLiteralStringEncrypt( bSetRelative ? INetURLObject::GetRelURL( m_aContext.BaseURL, aURLNoMark,
                                                                                         INetURLObject::EncodeMechanism::WasEncoded,
                                                                                         INetURLObject::DecodeMechanism::WithCharset ) :
                                                                   aURLNoMark, rLink.m_nObject, aLine, osl_getThreadTextEncoding() );
                    if( !aFragment.isEmpty() )
                    {
                        aLine.append("/D/");
                        appendDestinationName( aFragment , aLine );
                    }
                }
                else
                {
                    // change the fragment to accommodate the bookmark (only if the file extension
                    // is PDF and the requested action is of the correct type)
                    if(m_aContext.DefaultLinkAction == PDFWriter::URIActionDestination &&
                               bTargetHasPDFExtension && !aFragment.isEmpty() )
                    {
                        OStringBuffer aLineLoc( 1024 );
                        appendDestinationName( aFragment , aLineLoc );
                        //substitute the fragment
                        aTargetURL.SetMark( OStringToOUString(aLineLoc.makeStringAndClear(), RTL_TEXTENCODING_ASCII_US) );
                    }
                    OUString aURL = aTargetURL.GetMainURL( bFileSpec ? INetURLObject::DecodeMechanism::WithCharset : INetURLObject::DecodeMechanism::NONE );
                    appendLiteralStringEncrypt(bSetRelative ? INetURLObject::GetRelURL( m_aContext.BaseURL, aURL,
                                                                                        INetURLObject::EncodeMechanism::WasEncoded,
                                                                                            bFileSpec ? INetURLObject::DecodeMechanism::WithCharset : INetURLObject::DecodeMechanism::NONE
                                                                                            ) :
                                                                               aURL , rLink.m_nObject, aLine, osl_getThreadTextEncoding() );
                }
            }
            aLine.append( ">>\n" );
        }
        if( rLink.m_nStructParent > 0 )
        {
            aLine.append( "/StructParent " );
            aLine.append( rLink.m_nStructParent );
        }
        aLine.append( ">>\nendobj\n\n" );
        CHECK_RETURN( writeBuffer( aLine.getStr(), aLine.getLength() ) );
    }

    return true;
}

bool PDFWriterImpl::emitNoteAnnotations()
{
    // emit note annotations
    int nAnnots = m_aNotes.size();
    for( int i = 0; i < nAnnots; i++ )
    {
        const PDFNoteEntry& rNote       = m_aNotes[i];
        if( ! updateObject( rNote.m_nObject ) )
            return false;

        OStringBuffer aLine( 1024 );
        aLine.append( rNote.m_nObject );
        aLine.append( " 0 obj\n" );
// i59651: key /F set bits Print to 1 rest to 0. We don't set NoZoom NoRotate to 1, since it's a 'should'
// see PDF 8.4.2 and ISO 19005-1:2005 6.5.3
        aLine.append( "<</Type/Annot" );
        if( m_bIsPDF_A1 || m_bIsPDF_A2 )
            aLine.append( "/F 4" );
        aLine.append( "/Subtype/Text/Rect[" );

        appendFixedInt( rNote.m_aRect.Left(), aLine );
        aLine.append( ' ' );
        appendFixedInt( rNote.m_aRect.Top(), aLine );
        aLine.append( ' ' );
        appendFixedInt( rNote.m_aRect.Right(), aLine );
        aLine.append( ' ' );
        appendFixedInt( rNote.m_aRect.Bottom(), aLine );
        aLine.append( "]" );

        // contents of the note (type text string)
        aLine.append( "/Contents\n" );
        appendUnicodeTextStringEncrypt( rNote.m_aContents.Contents, rNote.m_nObject, aLine );
        aLine.append( "\n" );

        // optional title
        if( !rNote.m_aContents.Title.isEmpty() )
        {
            aLine.append( "/T" );
            appendUnicodeTextStringEncrypt( rNote.m_aContents.Title, rNote.m_nObject, aLine );
            aLine.append( "\n" );
        }

        aLine.append( ">>\nendobj\n\n" );
        CHECK_RETURN( writeBuffer( aLine.getStr(), aLine.getLength() ) );
    }
    return true;
}

Font PDFWriterImpl::replaceFont( const vcl::Font& rControlFont, const vcl::Font&  rAppSetFont )
{
    bool bAdjustSize = false;

    Font aFont( rControlFont );
    if( aFont.GetFamilyName().isEmpty() )
    {
        aFont = rAppSetFont;
        if( rControlFont.GetFontHeight() )
            aFont.SetFontSize( Size( 0, rControlFont.GetFontHeight() ) );
        else
            bAdjustSize = true;
        if( rControlFont.GetItalic() != ITALIC_DONTKNOW )
            aFont.SetItalic( rControlFont.GetItalic() );
        if( rControlFont.GetWeight() != WEIGHT_DONTKNOW )
            aFont.SetWeight( rControlFont.GetWeight() );
    }
    else if( ! aFont.GetFontHeight() )
    {
        aFont.SetFontSize( rAppSetFont.GetFontSize() );
        bAdjustSize = true;
    }
    if( bAdjustSize )
    {
        Size aFontSize = aFont.GetFontSize();
        OutputDevice* pDefDev = Application::GetDefaultDevice();
        aFontSize = OutputDevice::LogicToLogic( aFontSize, pDefDev->GetMapMode(), getMapMode() );
        aFont.SetFontSize( aFontSize );
    }
    return aFont;
}

sal_Int32 PDFWriterImpl::getBestBuildinFont( const vcl::Font& rFont )
{
    sal_Int32 nBest = 4; // default to Helvetica
    OUString aFontName( rFont.GetFamilyName() );
    aFontName = aFontName.toAsciiLowerCase();

    if( aFontName.indexOf( "times" ) != -1 )
        nBest = 8;
    else if( aFontName.indexOf( "courier" ) != -1 )
        nBest = 0;
    else if( aFontName.indexOf( "dingbats" ) != -1 )
        nBest = 13;
    else if( aFontName.indexOf( "symbol" ) != -1 )
        nBest = 12;
    if( nBest < 12 )
    {
        if( rFont.GetItalic() == ITALIC_OBLIQUE || rFont.GetItalic() == ITALIC_NORMAL )
            nBest += 1;
        if( rFont.GetWeight() > WEIGHT_MEDIUM )
            nBest += 2;
    }

    if( m_aBuildinFontToObjectMap.find( nBest ) == m_aBuildinFontToObjectMap.end() )
        m_aBuildinFontToObjectMap[ nBest ] = createObject();

    return nBest;
}

static const Color& replaceColor( const Color& rCol1, const Color& rCol2 )
{
    return (rCol1 == COL_TRANSPARENT) ? rCol2 : rCol1;
}

void PDFWriterImpl::createDefaultPushButtonAppearance( PDFWidget& rButton, const PDFWriter::PushButtonWidget& rWidget )
{
    const StyleSettings& rSettings = Application::GetSettings().GetStyleSettings();

    // save graphics state
    push( PushFlags::ALL );

    // transform relative to control's coordinates since an
    // appearance stream is a form XObject
    // this relies on the m_aRect member of rButton NOT already being transformed
    // to default user space
    if( rWidget.Background || rWidget.Border )
    {
        setLineColor( rWidget.Border ? replaceColor( rWidget.BorderColor, rSettings.GetLightColor() ) : COL_TRANSPARENT );
        setFillColor( rWidget.Background ? replaceColor( rWidget.BackgroundColor, rSettings.GetDialogColor() ) : COL_TRANSPARENT );
        drawRectangle( rWidget.Location );
    }
    // prepare font to use
    Font aFont = replaceFont( rWidget.TextFont, rSettings.GetPushButtonFont() );
    setFont( aFont );
    setTextColor( replaceColor( rWidget.TextColor, rSettings.GetButtonTextColor() ) );

    drawText( rButton.m_aRect, rButton.m_aText, rButton.m_nTextStyle );

    // create DA string while local mapmode is still in place
    // (that is before endRedirect())
    OStringBuffer aDA( 256 );
    appendNonStrokingColor( replaceColor( rWidget.TextColor, rSettings.GetButtonTextColor() ), aDA );
    Font aDummyFont( "Helvetica", aFont.GetFontSize() );
    sal_Int32 nDummyBuildin = getBestBuildinFont( aDummyFont );
    aDA.append( ' ' );
    aDA.append(pdf::BuildinFontFace::Get(nDummyBuildin).getNameObject());
    aDA.append( ' ' );
    m_aPages[m_nCurrentPage].appendMappedLength( sal_Int32( aFont.GetFontHeight() ), aDA );
    aDA.append( " Tf" );
    rButton.m_aDAString = aDA.makeStringAndClear();

    pop();

    rButton.m_aAppearances[ "N" ][ "Standard" ] = new SvMemoryStream();

    /* seems like a bad hack but at least works in both AR5 and 6:
       we draw the button ourselves and tell AR
       the button would be totally transparent with no text

       One would expect that simply setting a normal appearance
       should suffice, but no, as soon as the user actually presses
       the button and an action is tied to it (gasp! a button that
       does something) the appearance gets replaced by some crap that AR
       creates on the fly even if no DA or MK is given. On AR6 at least
       the DA and MK work as expected, but on AR5 this creates a region
       filled with the background color but nor text. Urgh.
    */
    rButton.m_aMKDict = "/BC [] /BG [] /CA";
    rButton.m_aMKDictCAString = "";
}

Font PDFWriterImpl::drawFieldBorder( PDFWidget& rIntern,
                                     const PDFWriter::AnyWidget& rWidget,
                                     const StyleSettings& rSettings )
{
    Font aFont = replaceFont( rWidget.TextFont, rSettings.GetFieldFont() );

    if( rWidget.Background || rWidget.Border )
    {
        if( rWidget.Border && rWidget.BorderColor == COL_TRANSPARENT )
        {
            sal_Int32 nDelta = GetDPIX() / 500;
            if( nDelta < 1 )
                nDelta = 1;
            setLineColor( COL_TRANSPARENT );
            tools::Rectangle aRect = rIntern.m_aRect;
            setFillColor( rSettings.GetLightBorderColor() );
            drawRectangle( aRect );
            aRect.AdjustLeft(nDelta ); aRect.AdjustTop(nDelta );
            aRect.AdjustRight( -nDelta ); aRect.AdjustBottom( -nDelta );
            setFillColor( rSettings.GetFieldColor() );
            drawRectangle( aRect );
            setFillColor( rSettings.GetLightColor() );
            drawRectangle( tools::Rectangle( Point( aRect.Left(), aRect.Bottom()-nDelta ), aRect.BottomRight() ) );
            drawRectangle( tools::Rectangle( Point( aRect.Right()-nDelta, aRect.Top() ), aRect.BottomRight() ) );
            setFillColor( rSettings.GetDarkShadowColor() );
            drawRectangle( tools::Rectangle( aRect.TopLeft(), Point( aRect.Left()+nDelta, aRect.Bottom() ) ) );
            drawRectangle( tools::Rectangle( aRect.TopLeft(), Point( aRect.Right(), aRect.Top()+nDelta ) ) );
        }
        else
        {
            setLineColor( rWidget.Border ? replaceColor( rWidget.BorderColor, rSettings.GetShadowColor() ) : COL_TRANSPARENT );
            setFillColor( rWidget.Background ? replaceColor( rWidget.BackgroundColor, rSettings.GetFieldColor() ) : COL_TRANSPARENT );
            drawRectangle( rIntern.m_aRect );
        }

        if( rWidget.Border )
        {
            // adjust edit area accounting for border
            sal_Int32 nDelta = aFont.GetFontHeight()/4;
            if( nDelta < 1 )
                nDelta = 1;
            rIntern.m_aRect.AdjustLeft(nDelta );
            rIntern.m_aRect.AdjustTop(nDelta );
            rIntern.m_aRect.AdjustRight( -nDelta );
            rIntern.m_aRect.AdjustBottom( -nDelta );
        }
    }
    return aFont;
}

void PDFWriterImpl::createDefaultEditAppearance( PDFWidget& rEdit, const PDFWriter::EditWidget& rWidget )
{
    const StyleSettings& rSettings = Application::GetSettings().GetStyleSettings();
    SvMemoryStream* pEditStream = new SvMemoryStream( 1024, 1024 );

    push( PushFlags::ALL );

    // prepare font to use, draw field border
    Font aFont = drawFieldBorder( rEdit, rWidget, rSettings );
    sal_Int32 nBest = getSystemFont( aFont );

    // prepare DA string
    OStringBuffer aDA( 32 );
    appendNonStrokingColor( replaceColor( rWidget.TextColor, rSettings.GetFieldTextColor() ), aDA );
    aDA.append( ' ' );
    aDA.append( "/F" );
    aDA.append( nBest );

    OStringBuffer aDR( 32 );
    aDR.append( "/Font " );
    aDR.append( getFontDictObject() );
    aDR.append( " 0 R" );
    rEdit.m_aDRDict = aDR.makeStringAndClear();
    aDA.append( ' ' );
    m_aPages[ m_nCurrentPage ].appendMappedLength( sal_Int32( aFont.GetFontHeight() ), aDA );
    aDA.append( " Tf" );

    /*  create an empty appearance stream, let the viewer create
        the appearance at runtime. This is because AR5 seems to
        paint the widget appearance always, and a dynamically created
        appearance on top of it. AR6 is well behaved in that regard, so
        that behaviour seems to be a bug. Anyway this empty appearance
        relies on /NeedAppearances in the AcroForm dictionary set to "true"
     */
    beginRedirect( pEditStream, rEdit.m_aRect );
    OString aAppearance = "/Tx BMC\nEMC\n";
    writeBuffer( aAppearance.getStr(), aAppearance.getLength() );

    endRedirect();
    pop();

    rEdit.m_aAppearances[ "N" ][ "Standard" ] = pEditStream;

    rEdit.m_aDAString = aDA.makeStringAndClear();
}

void PDFWriterImpl::createDefaultListBoxAppearance( PDFWidget& rBox, const PDFWriter::ListBoxWidget& rWidget )
{
    const StyleSettings& rSettings = Application::GetSettings().GetStyleSettings();
    SvMemoryStream* pListBoxStream = new SvMemoryStream( 1024, 1024 );

    push( PushFlags::ALL );

    // prepare font to use, draw field border
    Font aFont = drawFieldBorder( rBox, rWidget, rSettings );
    sal_Int32 nBest = getSystemFont( aFont );

    beginRedirect( pListBoxStream, rBox.m_aRect );

    setLineColor( COL_TRANSPARENT );
    setFillColor( replaceColor( rWidget.BackgroundColor, rSettings.GetFieldColor() ) );
    drawRectangle( rBox.m_aRect );

    // empty appearance, see createDefaultEditAppearance for reference
    OString aAppearance = "/Tx BMC\nEMC\n";
    writeBuffer( aAppearance.getStr(), aAppearance.getLength() );

    endRedirect();
    pop();

    rBox.m_aAppearances[ "N" ][ "Standard" ] = pListBoxStream;

    // prepare DA string
    OStringBuffer aDA( 256 );
    // prepare DA string
    appendNonStrokingColor( replaceColor( rWidget.TextColor, rSettings.GetFieldTextColor() ), aDA );
    aDA.append( ' ' );
    aDA.append( "/F" );
    aDA.append( nBest );

    OStringBuffer aDR( 32 );
    aDR.append( "/Font " );
    aDR.append( getFontDictObject() );
    aDR.append( " 0 R" );
    rBox.m_aDRDict = aDR.makeStringAndClear();
    aDA.append( ' ' );
    m_aPages[ m_nCurrentPage ].appendMappedLength( sal_Int32( aFont.GetFontHeight() ), aDA );
    aDA.append( " Tf" );
    rBox.m_aDAString = aDA.makeStringAndClear();
}

void PDFWriterImpl::createDefaultCheckBoxAppearance( PDFWidget& rBox, const PDFWriter::CheckBoxWidget& rWidget )
{
    const StyleSettings& rSettings = Application::GetSettings().GetStyleSettings();

    // save graphics state
    push( PushFlags::ALL );

    if( rWidget.Background || rWidget.Border )
    {
        setLineColor( rWidget.Border ? replaceColor( rWidget.BorderColor, rSettings.GetCheckedColor() ) : COL_TRANSPARENT );
        setFillColor( rWidget.Background ? replaceColor( rWidget.BackgroundColor, rSettings.GetFieldColor() ) : COL_TRANSPARENT );
        drawRectangle( rBox.m_aRect );
    }

    Font aFont = replaceFont( rWidget.TextFont, rSettings.GetRadioCheckFont() );
    setFont( aFont );
    Size aFontSize = aFont.GetFontSize();
    if( aFontSize.Height() > rBox.m_aRect.GetHeight() )
        aFontSize.setHeight( rBox.m_aRect.GetHeight() );
    sal_Int32 nDelta = aFontSize.Height()/10;
    if( nDelta < 1 )
        nDelta = 1;

    tools::Rectangle aCheckRect, aTextRect;
    {
        aCheckRect.SetLeft( rBox.m_aRect.Left() + nDelta );
        aCheckRect.SetTop( rBox.m_aRect.Top() + (rBox.m_aRect.GetHeight()-aFontSize.Height())/2 );
        aCheckRect.SetRight( aCheckRect.Left() + aFontSize.Height() );
        aCheckRect.SetBottom( aCheckRect.Top() + aFontSize.Height() );

        // #i74206# handle small controls without text area
        while( aCheckRect.GetWidth() > rBox.m_aRect.GetWidth() && aCheckRect.GetWidth() > nDelta )
        {
            aCheckRect.AdjustRight( -nDelta );
            aCheckRect.AdjustTop(nDelta/2 );
            aCheckRect.AdjustBottom( -(nDelta - (nDelta/2)) );
        }

        aTextRect.SetLeft( rBox.m_aRect.Left() + aCheckRect.GetWidth()+5*nDelta );
        aTextRect.SetTop( rBox.m_aRect.Top() );
        aTextRect.SetRight( aTextRect.Left() + rBox.m_aRect.GetWidth() - aCheckRect.GetWidth()-6*nDelta );
        aTextRect.SetBottom( rBox.m_aRect.Bottom() );
    }
    setLineColor( COL_BLACK );
    setFillColor( COL_TRANSPARENT );
    OStringBuffer aLW( 32 );
    aLW.append( "q " );
    m_aPages[m_nCurrentPage].appendMappedLength( nDelta, aLW );
    aLW.append( " w " );
    writeBuffer( aLW.getStr(), aLW.getLength() );
    drawRectangle( aCheckRect );
    writeBuffer( " Q\n", 3 );
    setTextColor( replaceColor( rWidget.TextColor, rSettings.GetRadioCheckTextColor() ) );
    drawText( aTextRect, rBox.m_aText, rBox.m_nTextStyle );

    pop();

    OStringBuffer aDA( 256 );

    // tdf#93853 don't rely on Zapf (or any other 'standard' font)
    // being present, but our own OpenSymbol - N.B. PDF/A for good
    // reasons require even the standard PS fonts to be embedded!
    Push();
    SetFont( Font( OUString( "OpenSymbol" ), aFont.GetFontSize() ) );
    FontCharMapRef pMap;
    GetFontCharMap(pMap);
    const LogicalFontInstance* pFontInstance = GetFontInstance();
    const PhysicalFontFace* pDevFont = pFontInstance->GetFontFace();
    Pop();

    // make sure OpenSymbol is embedded, and includes our checkmark
    const sal_Unicode cMark=0x2713;
    const GlyphItem aItem(0, 0, pMap->GetGlyphIndex(cMark),
                          Point(), GlyphItemFlags::NONE, 0, 0,
                          const_cast<LogicalFontInstance*>(pFontInstance));
    const std::vector<sal_Ucs> aCodeUnits={ cMark };
    sal_uInt8 nMappedGlyph;
    sal_Int32 nMappedFontObject;
    registerGlyph(&aItem, pDevFont, aCodeUnits, nMappedGlyph, nMappedFontObject);

    appendNonStrokingColor( replaceColor( rWidget.TextColor, rSettings.GetRadioCheckTextColor() ), aDA );
    aDA.append( ' ' );
    aDA.append( "/F" );
    aDA.append( nMappedFontObject );
    aDA.append( " 0 Tf" );

    OStringBuffer aDR( 32 );
    aDR.append( "/Font " );
    aDR.append( getFontDictObject() );
    aDR.append( " 0 R" );
    rBox.m_aDRDict = aDR.makeStringAndClear();
    rBox.m_aDAString = aDA.makeStringAndClear();
    rBox.m_aMKDict = "/CA";
    rBox.m_aMKDictCAString = "8";
    rBox.m_aRect = aCheckRect;

    // create appearance streams
    sal_Int32 nCharXOffset = 1000 - 787; // metrics from OpenSymbol
    nCharXOffset *= aCheckRect.GetHeight();
    nCharXOffset /= 2000;
    sal_Int32 nCharYOffset = 1000 - (820-143); // metrics from Zapf
    nCharYOffset *= aCheckRect.GetHeight();
    nCharYOffset /= 2000;

    // write 'checked' appearance stream
    SvMemoryStream* pCheckStream = new SvMemoryStream( 256, 256 );
    beginRedirect( pCheckStream, aCheckRect );
    aDA.append( "/Tx BMC\nq BT\n" );
    appendNonStrokingColor( replaceColor( rWidget.TextColor, rSettings.GetRadioCheckTextColor() ), aDA );
    aDA.append( ' ' );
    aDA.append( "/F" );
    aDA.append( nMappedFontObject );
    aDA.append( ' ' );
    m_aPages[ m_nCurrentPage ].appendMappedLength( sal_Int32( aCheckRect.GetHeight() ), aDA );
    aDA.append( " Tf\n" );
    m_aPages[ m_nCurrentPage ].appendMappedLength( nCharXOffset, aDA );
    aDA.append( " " );
    m_aPages[ m_nCurrentPage ].appendMappedLength( nCharYOffset, aDA );
    aDA.append( " Td <" );
    appendHex( nMappedGlyph, aDA );
    aDA.append( "> Tj\nET\nQ\nEMC\n" );
    writeBuffer( aDA.getStr(), aDA.getLength() );
    endRedirect();
    rBox.m_aAppearances[ "N" ][ "Yes" ] = pCheckStream;

    // write 'unchecked' appearance stream
    SvMemoryStream* pUncheckStream = new SvMemoryStream( 256, 256 );
    beginRedirect( pUncheckStream, aCheckRect );
    writeBuffer( "/Tx BMC\nEMC\n", 12 );
    endRedirect();
    rBox.m_aAppearances[ "N" ][ "Off" ] = pUncheckStream;
}

void PDFWriterImpl::createDefaultRadioButtonAppearance( PDFWidget& rBox, const PDFWriter::RadioButtonWidget& rWidget )
{
    const StyleSettings& rSettings = Application::GetSettings().GetStyleSettings();

    // save graphics state
    push( PushFlags::ALL );

    if( rWidget.Background || rWidget.Border )
    {
        setLineColor( rWidget.Border ? replaceColor( rWidget.BorderColor, rSettings.GetCheckedColor() ) : COL_TRANSPARENT );
        setFillColor( rWidget.Background ? replaceColor( rWidget.BackgroundColor, rSettings.GetFieldColor() ) : COL_TRANSPARENT );
        drawRectangle( rBox.m_aRect );
    }

    Font aFont = replaceFont( rWidget.TextFont, rSettings.GetRadioCheckFont() );
    setFont( aFont );
    Size aFontSize = aFont.GetFontSize();
    if( aFontSize.Height() > rBox.m_aRect.GetHeight() )
        aFontSize.setHeight( rBox.m_aRect.GetHeight() );
    sal_Int32 nDelta = aFontSize.Height()/10;
    if( nDelta < 1 )
        nDelta = 1;

    tools::Rectangle aCheckRect, aTextRect;
    {
        aCheckRect.SetLeft( rBox.m_aRect.Left() + nDelta );
        aCheckRect.SetTop( rBox.m_aRect.Top() + (rBox.m_aRect.GetHeight()-aFontSize.Height())/2 );
        aCheckRect.SetRight( aCheckRect.Left() + aFontSize.Height() );
        aCheckRect.SetBottom( aCheckRect.Top() + aFontSize.Height() );

        // #i74206# handle small controls without text area
        while( aCheckRect.GetWidth() > rBox.m_aRect.GetWidth() && aCheckRect.GetWidth() > nDelta )
        {
            aCheckRect.AdjustRight( -nDelta );
            aCheckRect.AdjustTop(nDelta/2 );
            aCheckRect.AdjustBottom( -(nDelta - (nDelta/2)) );
        }

        aTextRect.SetLeft( rBox.m_aRect.Left() + aCheckRect.GetWidth()+5*nDelta );
        aTextRect.SetTop( rBox.m_aRect.Top() );
        aTextRect.SetRight( aTextRect.Left() + rBox.m_aRect.GetWidth() - aCheckRect.GetWidth()-6*nDelta );
        aTextRect.SetBottom( rBox.m_aRect.Bottom() );
    }
    setLineColor( COL_BLACK );
    setFillColor( COL_TRANSPARENT );
    OStringBuffer aLW( 32 );
    aLW.append( "q " );
    m_aPages[ m_nCurrentPage ].appendMappedLength( nDelta, aLW );
    aLW.append( " w " );
    writeBuffer( aLW.getStr(), aLW.getLength() );
    drawEllipse( aCheckRect );
    writeBuffer( " Q\n", 3 );
    setTextColor( replaceColor( rWidget.TextColor, rSettings.GetRadioCheckTextColor() ) );
    drawText( aTextRect, rBox.m_aText, rBox.m_nTextStyle );

    pop();

    OStringBuffer aDA( 256 );
    appendNonStrokingColor( replaceColor( rWidget.TextColor, rSettings.GetRadioCheckTextColor() ), aDA );
    rBox.m_aDAString = aDA.makeStringAndClear();
    //to encrypt this (el)
    rBox.m_aMKDict = "/CA";
    //after this assignment, to m_aMKDic cannot be added anything
    rBox.m_aMKDictCAString = "l";

    rBox.m_aRect = aCheckRect;

    // create appearance streams
    push( PushFlags::ALL);
    SvMemoryStream* pCheckStream = new SvMemoryStream( 256, 256 );

    beginRedirect( pCheckStream, aCheckRect );
    aDA.append( "/Tx BMC\nq BT\n" );
    appendNonStrokingColor( replaceColor( rWidget.TextColor, rSettings.GetRadioCheckTextColor() ), aDA );
    aDA.append( ' ' );
    m_aPages[m_nCurrentPage].appendMappedLength( sal_Int32( aCheckRect.GetHeight() ), aDA );
    aDA.append( " 0 0 Td\nET\nQ\n" );
    writeBuffer( aDA.getStr(), aDA.getLength() );
    setFillColor( replaceColor( rWidget.TextColor, rSettings.GetRadioCheckTextColor() ) );
    setLineColor( COL_TRANSPARENT );
    aCheckRect.AdjustLeft(3*nDelta );
    aCheckRect.AdjustTop(3*nDelta );
    aCheckRect.AdjustBottom( -(3*nDelta) );
    aCheckRect.AdjustRight( -(3*nDelta) );
    drawEllipse( aCheckRect );
    writeBuffer( "\nEMC\n", 5 );
    endRedirect();

    pop();
    rBox.m_aAppearances[ "N" ][ "Yes" ] = pCheckStream;

    SvMemoryStream* pUncheckStream = new SvMemoryStream( 256, 256 );
    beginRedirect( pUncheckStream, aCheckRect );
    writeBuffer( "/Tx BMC\nEMC\n", 12 );
    endRedirect();
    rBox.m_aAppearances[ "N" ][ "Off" ] = pUncheckStream;
}

bool PDFWriterImpl::emitAppearances( PDFWidget& rWidget, OStringBuffer& rAnnotDict )
{
    // TODO: check and insert default streams
    OString aStandardAppearance;
    switch( rWidget.m_eType )
    {
        case PDFWriter::CheckBox:
            aStandardAppearance = OUStringToOString( rWidget.m_aValue, RTL_TEXTENCODING_ASCII_US );
            break;
        default:
            break;
    }

    if( !rWidget.m_aAppearances.empty() )
    {
        rAnnotDict.append( "/AP<<\n" );
        for (auto & dict_item : rWidget.m_aAppearances)
        {
            rAnnotDict.append( "/" );
            rAnnotDict.append( dict_item.first );
            bool bUseSubDict = (dict_item.second.size() > 1);

            // PDF/A requires sub-dicts for /FT/Btn objects (clause
            // 6.3.3)
            if( m_bIsPDF_A1 || m_bIsPDF_A2 )
            {
                if( rWidget.m_eType == PDFWriter::RadioButton ||
                    rWidget.m_eType == PDFWriter::CheckBox ||
                    rWidget.m_eType == PDFWriter::PushButton )
                {
                    bUseSubDict = true;
                }
            }

            rAnnotDict.append( bUseSubDict ? "<<" : " " );

            for (auto const& stream_item : dict_item.second)
            {
                SvMemoryStream* pApppearanceStream = stream_item.second;
                dict_item.second[ stream_item.first ] = nullptr;

                bool bDeflate = compressStream( pApppearanceStream );

                sal_Int64 nStreamLen = pApppearanceStream->TellEnd();
                pApppearanceStream->Seek( STREAM_SEEK_TO_BEGIN );
                sal_Int32 nObject = createObject();
                CHECK_RETURN( updateObject( nObject ) );
                if (g_bDebugDisableCompression)
                {
                    emitComment( "PDFWriterImpl::emitAppearances" );
                }
                OStringBuffer aLine;
                aLine.append( nObject );

                aLine.append( " 0 obj\n"
                              "<</Type/XObject\n"
                              "/Subtype/Form\n"
                              "/BBox[0 0 " );
                appendFixedInt( rWidget.m_aRect.GetWidth()-1, aLine );
                aLine.append( " " );
                appendFixedInt( rWidget.m_aRect.GetHeight()-1, aLine );
                aLine.append( "]\n"
                              "/Resources " );
                aLine.append( getResourceDictObj() );
                aLine.append( " 0 R\n"
                              "/Length " );
                aLine.append( nStreamLen );
                aLine.append( "\n" );
                if( bDeflate )
                    aLine.append( "/Filter/FlateDecode\n" );
                aLine.append( ">>\nstream\n" );
                CHECK_RETURN( writeBuffer( aLine.getStr(), aLine.getLength() ) );
                checkAndEnableStreamEncryption( nObject );
                CHECK_RETURN( writeBuffer( pApppearanceStream->GetData(), nStreamLen ) );
                disableStreamEncryption();
                CHECK_RETURN( writeBuffer( "\nendstream\nendobj\n\n", 19 ) );

                if( bUseSubDict )
                {
                    rAnnotDict.append( " /" );
                    rAnnotDict.append( stream_item.first );
                    rAnnotDict.append( " " );
                }
                rAnnotDict.append( nObject );
                rAnnotDict.append( " 0 R" );

                delete pApppearanceStream;
            }

            rAnnotDict.append( bUseSubDict ? ">>\n" : "\n" );
        }
        rAnnotDict.append( ">>\n" );
        if( !aStandardAppearance.isEmpty() )
        {
            rAnnotDict.append( "/AS /" );
            rAnnotDict.append( aStandardAppearance );
            rAnnotDict.append( "\n" );
        }
    }

    return true;
}

bool PDFWriterImpl::emitWidgetAnnotations()
{
    ensureUniqueRadioOnValues();

    int nAnnots = m_aWidgets.size();
    for( int a = 0; a < nAnnots; a++ )
    {
        PDFWidget& rWidget = m_aWidgets[a];

        OStringBuffer aLine( 1024 );
        OStringBuffer aValue( 256 );
        aLine.append( rWidget.m_nObject );
        aLine.append( " 0 obj\n"
                      "<<" );
        if( rWidget.m_eType != PDFWriter::Hierarchy )
        {
            // emit widget annotation only for terminal fields
            if( rWidget.m_aKids.empty() )
            {
                int iRectMargin;

                aLine.append( "/Type/Annot/Subtype/Widget/F " );

                if (rWidget.m_eType == PDFWriter::Signature)
                {
                    aLine.append( "132\n" ); // Print & Locked
                    iRectMargin = 0;
                }
                else
                {
                    aLine.append( "4\n" );
                    iRectMargin = 1;
                }

                aLine.append("/Rect[" );
                appendFixedInt( rWidget.m_aRect.Left()-iRectMargin, aLine );
                aLine.append( ' ' );
                appendFixedInt( rWidget.m_aRect.Top()+iRectMargin, aLine );
                aLine.append( ' ' );
                appendFixedInt( rWidget.m_aRect.Right()+iRectMargin, aLine );
                aLine.append( ' ' );
                appendFixedInt( rWidget.m_aRect.Bottom()-iRectMargin, aLine );
                aLine.append( "]\n" );
            }
            aLine.append( "/FT/" );
            switch( rWidget.m_eType )
            {
                case PDFWriter::RadioButton:
                case PDFWriter::CheckBox:
                    // for radio buttons only the RadioButton field, not the
                    // CheckBox children should have a value, else acrobat reader
                    // does not always check the right button
                    // of course real check boxes (not belonging to a radio group)
                    // need their values, too
                    if( rWidget.m_eType == PDFWriter::RadioButton || rWidget.m_nRadioGroup < 0 )
                    {
                        aValue.append( "/" );
                        // check for radio group with all buttons unpressed
                        if( rWidget.m_aValue.isEmpty() )
                            aValue.append( "Off" );
                        else
                            appendName( rWidget.m_aValue, aValue );
                    }
                    [[fallthrough]];
                case PDFWriter::PushButton:
                    aLine.append( "Btn" );
                    break;
                case PDFWriter::ListBox:
                    if( rWidget.m_nFlags & 0x200000 ) // multiselect
                    {
                        aValue.append( "[" );
                        for( size_t i = 0; i < rWidget.m_aSelectedEntries.size(); i++ )
                        {
                            sal_Int32 nEntry = rWidget.m_aSelectedEntries[i];
                            if( nEntry >= 0 && nEntry < sal_Int32(rWidget.m_aListEntries.size()) )
                                appendUnicodeTextStringEncrypt( rWidget.m_aListEntries[ nEntry ], rWidget.m_nObject, aValue );
                        }
                        aValue.append( "]" );
                    }
                    else if( !rWidget.m_aSelectedEntries.empty() &&
                             rWidget.m_aSelectedEntries[0] >= 0 &&
                             rWidget.m_aSelectedEntries[0] < sal_Int32(rWidget.m_aListEntries.size()) )
                    {
                        appendUnicodeTextStringEncrypt( rWidget.m_aListEntries[ rWidget.m_aSelectedEntries[0] ], rWidget.m_nObject, aValue );
                    }
                    else
                        appendUnicodeTextStringEncrypt( OUString(), rWidget.m_nObject, aValue );
                    aLine.append( "Ch" );
                    break;
                case PDFWriter::ComboBox:
                    appendUnicodeTextStringEncrypt( rWidget.m_aValue, rWidget.m_nObject, aValue );
                    aLine.append( "Ch" );
                    break;
                case PDFWriter::Edit:
                    aLine.append( "Tx" );
                    appendUnicodeTextStringEncrypt( rWidget.m_aValue, rWidget.m_nObject, aValue );
                    break;
                case PDFWriter::Signature:
                    aLine.append( "Sig" );
                    aValue.append(OUStringToOString(rWidget.m_aValue, RTL_TEXTENCODING_ASCII_US));
                    break;
                case PDFWriter::Hierarchy: // make the compiler happy
                    break;
            }
            aLine.append( "\n" );
            aLine.append( "/P " );
            aLine.append( m_aPages[ rWidget.m_nPage ].m_nPageObject );
            aLine.append( " 0 R\n" );
        }
        if( rWidget.m_nParent )
        {
            aLine.append( "/Parent " );
            aLine.append( rWidget.m_nParent );
            aLine.append( " 0 R\n" );
        }
        if( !rWidget.m_aKids.empty() )
        {
            aLine.append( "/Kids[" );
            for( size_t i = 0; i < rWidget.m_aKids.size(); i++ )
            {
                aLine.append( rWidget.m_aKids[i] );
                aLine.append( " 0 R" );
                aLine.append( ( (i&15) == 15 ) ? "\n" : " " );
            }
            aLine.append( "]\n" );
        }
        if( !rWidget.m_aName.isEmpty() )
        {
            aLine.append( "/T" );
            appendLiteralStringEncrypt( rWidget.m_aName, rWidget.m_nObject, aLine );
            aLine.append( "\n" );
        }
        if( m_aContext.Version > PDFWriter::PDFVersion::PDF_1_2 && !rWidget.m_aDescription.isEmpty() )
        {
            // the alternate field name should be unicode able since it is
            // supposed to be used in UI
            aLine.append( "/TU" );
            appendUnicodeTextStringEncrypt( rWidget.m_aDescription, rWidget.m_nObject, aLine );
            aLine.append( "\n" );
        }

        if( rWidget.m_nFlags )
        {
            aLine.append( "/Ff " );
            aLine.append( rWidget.m_nFlags );
            aLine.append( "\n" );
        }
        if( !aValue.isEmpty() )
        {
            OString aVal = aValue.makeStringAndClear();
            aLine.append( "/V " );
            aLine.append( aVal );
            aLine.append( "\n"
                          "/DV " );
            aLine.append( aVal );
            aLine.append( "\n" );
        }
        if( rWidget.m_eType == PDFWriter::ListBox || rWidget.m_eType == PDFWriter::ComboBox )
        {
            sal_Int32 nTI = -1;
            aLine.append( "/Opt[\n" );
            sal_Int32 i = 0;
            for (auto const& entry : rWidget.m_aListEntries)
            {
                appendUnicodeTextStringEncrypt( entry, rWidget.m_nObject, aLine );
                aLine.append( "\n" );
                if( entry == rWidget.m_aValue )
                    nTI = i;
                ++i;
            }
            aLine.append( "]\n" );
            if( nTI > 0 )
            {
                aLine.append( "/TI " );
                aLine.append( nTI );
                aLine.append( "\n" );
                if( rWidget.m_nFlags & 0x200000 ) // Multiselect
                {
                    aLine.append( "/I [" );
                    aLine.append( nTI );
                    aLine.append( "]\n" );
                }
            }
        }
        if( rWidget.m_eType == PDFWriter::Edit && rWidget.m_nMaxLen > 0 )
        {
            aLine.append( "/MaxLen " );
            aLine.append( rWidget.m_nMaxLen );
            aLine.append( "\n" );
        }
        if( rWidget.m_eType == PDFWriter::PushButton )
        {
            if(!m_bIsPDF_A1)
            {
                OStringBuffer aDest;
                if( rWidget.m_nDest != -1 && appendDest( m_aDestinationIdTranslation[ rWidget.m_nDest ], aDest ) )
                {
                    aLine.append( "/AA<</D<</Type/Action/S/GoTo/D " );
                    aLine.append( aDest.makeStringAndClear() );
                    aLine.append( ">>>>\n" );
                }
                else if( rWidget.m_aListEntries.empty() )
                {
                    if( !m_bIsPDF_A2 )
                    {
                        // create a reset form action
                        aLine.append( "/AA<</D<</Type/Action/S/ResetForm>>>>\n" );
                    }
                }
                else if( rWidget.m_bSubmit )
                {
                    // create a submit form action
                    aLine.append( "/AA<</D<</Type/Action/S/SubmitForm/F" );
                    appendLiteralStringEncrypt( rWidget.m_aListEntries.front(), rWidget.m_nObject, aLine, osl_getThreadTextEncoding() );
                    aLine.append( "/Flags " );

                    sal_Int32 nFlags = 0;
                    switch( m_aContext.SubmitFormat )
                    {
                    case PDFWriter::HTML:
                        nFlags |= 4;
                        break;
                    case PDFWriter::XML:
                        if( m_aContext.Version > PDFWriter::PDFVersion::PDF_1_3 )
                            nFlags |= 32;
                        break;
                    case PDFWriter::PDF:
                        if( m_aContext.Version > PDFWriter::PDFVersion::PDF_1_3 )
                            nFlags |= 256;
                        break;
                    case PDFWriter::FDF:
                    default:
                        break;
                    }
                    if( rWidget.m_bSubmitGet )
                        nFlags |= 8;
                    aLine.append( nFlags );
                    aLine.append( ">>>>\n" );
                }
                else
                {
                    // create a URI action
                    aLine.append( "/AA<</D<</Type/Action/S/URI/URI(" );
                    aLine.append( OUStringToOString( rWidget.m_aListEntries.front(), RTL_TEXTENCODING_ASCII_US ) );
                    aLine.append( ")>>>>\n" );
                }
            }
            else
                m_aErrors.insert( PDFWriter::Warning_FormAction_Omitted_PDFA );
        }
        if( !rWidget.m_aDAString.isEmpty() )
        {
            if( !rWidget.m_aDRDict.isEmpty() )
            {
                aLine.append( "/DR<<" );
                aLine.append( rWidget.m_aDRDict );
                aLine.append( ">>\n" );
            }
            else
            {
                aLine.append( "/DR<</Font<<" );
                appendBuildinFontsToDict( aLine );
                aLine.append( ">>>>\n" );
            }
            aLine.append( "/DA" );
            appendLiteralStringEncrypt( rWidget.m_aDAString, rWidget.m_nObject, aLine );
            aLine.append( "\n" );
            if( rWidget.m_nTextStyle & DrawTextFlags::Center )
                aLine.append( "/Q 1\n" );
            else if( rWidget.m_nTextStyle & DrawTextFlags::Right )
                aLine.append( "/Q 2\n" );
        }
        // appearance characteristics for terminal fields
        // which are supposed to have an appearance constructed
        // by the viewer application
        if( !rWidget.m_aMKDict.isEmpty() )
        {
            aLine.append( "/MK<<" );
            aLine.append( rWidget.m_aMKDict );
            //add the CA string, encrypting it
            appendLiteralStringEncrypt(rWidget.m_aMKDictCAString, rWidget.m_nObject, aLine);
            aLine.append( ">>\n" );
        }

        CHECK_RETURN( emitAppearances( rWidget, aLine ) );

        aLine.append( ">>\n"
                      "endobj\n\n" );
        CHECK_RETURN( updateObject( rWidget.m_nObject ) );
        CHECK_RETURN( writeBuffer( aLine.getStr(), aLine.getLength() ) );
    }
    return true;
}

bool PDFWriterImpl::emitAnnotations()
{
    if( m_aPages.empty() )
        return false;

    CHECK_RETURN( emitLinkAnnotations() );
    CHECK_RETURN(emitScreenAnnotations());
    CHECK_RETURN( emitNoteAnnotations() );
    CHECK_RETURN( emitWidgetAnnotations() );

    return true;
}

bool PDFWriterImpl::emitEmbeddedFiles()
{
    for (auto& rEmbeddedFile : m_aEmbeddedFiles)
    {
        if (!updateObject(rEmbeddedFile.m_nObject))
            continue;

        OStringBuffer aLine;
        aLine.append(rEmbeddedFile.m_nObject);
        aLine.append(" 0 obj\n");
        aLine.append("<< /Type /EmbeddedFile /Length ");
        aLine.append(static_cast<sal_Int64>(rEmbeddedFile.m_pData->size()));
        aLine.append(" >>\nstream\n");
        CHECK_RETURN(writeBuffer(aLine.getStr(), aLine.getLength()));
        aLine.setLength(0);

        CHECK_RETURN(writeBuffer(rEmbeddedFile.m_pData->data(), rEmbeddedFile.m_pData->size()));

        aLine.append("\nendstream\nendobj\n\n");
        CHECK_RETURN(writeBuffer(aLine.getStr(), aLine.getLength()));
    }
    return true;
}

#undef CHECK_RETURN
#define CHECK_RETURN( x ) if( !x ) return false

bool PDFWriterImpl::emitCatalog()
{
    // build page tree
    // currently there is only one node that contains all leaves

    // first create a page tree node id
    sal_Int32 nTreeNode = createObject();

    // emit global resource dictionary (page emit needs it)
    CHECK_RETURN( emitResources() );

    // emit all pages
    for (auto & page : m_aPages)
        if( ! page.emit( nTreeNode ) )
            return false;

    sal_Int32 nNamedDestinationsDictionary = emitNamedDestinations();

    sal_Int32 nOutlineDict = emitOutline();

    // emit Output intent
    sal_Int32 nOutputIntentObject = emitOutputIntent();

    // emit metadata
    sal_Int32 nMetadataObject = emitDocumentMetadata();

    sal_Int32 nStructureDict = 0;
    if(m_aStructure.size() > 1)
    {
        // check if dummy structure containers are needed
        addInternalStructureContainer(m_aStructure[0]);
        nStructureDict = m_aStructure[0].m_nObject = createObject();
        emitStructure( m_aStructure[ 0 ] );
    }

    // adjust tree node file offset
    if( ! updateObject( nTreeNode ) )
        return false;

    // emit tree node
    OStringBuffer aLine( 2048 );
    aLine.append( nTreeNode );
    aLine.append( " 0 obj\n" );
    aLine.append( "<</Type/Pages\n" );
    aLine.append( "/Resources " );
    aLine.append( getResourceDictObj() );
    aLine.append( " 0 R\n" );

    sal_Int32 nMediaBoxWidth = 0;
    sal_Int32 nMediaBoxHeight = 0;
    if( m_aPages.empty() ) // sanity check, this should not happen
    {
        nMediaBoxWidth = g_nInheritedPageWidth;
        nMediaBoxHeight = g_nInheritedPageHeight;
    }
    else
    {
        for (auto const& page : m_aPages)
        {
            if( page.m_nPageWidth > nMediaBoxWidth )
                nMediaBoxWidth = page.m_nPageWidth;
            if( page.m_nPageHeight > nMediaBoxHeight )
                nMediaBoxHeight = page.m_nPageHeight;
        }
    }
    aLine.append( "/MediaBox[ 0 0 " );
    aLine.append( nMediaBoxWidth );
    aLine.append( ' ' );
    aLine.append( nMediaBoxHeight );
    aLine.append( " ]\n"
                  "/Kids[ " );
    unsigned int i = 0;
    for (const auto & page : m_aPages)
    {
        aLine.append( page.m_nPageObject );
        aLine.append( " 0 R" );
        aLine.append( ( (i&15) == 15 ) ? "\n" : " " );
        ++i;
    }
    aLine.append( "]\n"
                  "/Count " );
    aLine.append( static_cast<sal_Int32>(m_aPages.size()) );
    aLine.append( ">>\n"
                  "endobj\n\n" );
    CHECK_RETURN( writeBuffer( aLine.getStr(), aLine.getLength() ) );

    // emit annotation objects
    CHECK_RETURN( emitAnnotations() );
    CHECK_RETURN( emitEmbeddedFiles() );

    // emit Catalog
    m_nCatalogObject = createObject();
    if( ! updateObject( m_nCatalogObject ) )
        return false;
    aLine.setLength( 0 );
    aLine.append( m_nCatalogObject );
    aLine.append( " 0 obj\n"
                  "<</Type/Catalog/Pages " );
    aLine.append( nTreeNode );
    aLine.append( " 0 R\n" );

    // check if there are named destinations to emit (root must be inside the catalog)
    if( nNamedDestinationsDictionary )
    {
        aLine.append("/Dests ");
        aLine.append( nNamedDestinationsDictionary );
        aLine.append( " 0 R\n" );
    }

    if( m_aContext.PageLayout != PDFWriter::DefaultLayout )
        switch(  m_aContext.PageLayout )
        {
        default :
        case  PDFWriter::SinglePage :
            aLine.append( "/PageLayout/SinglePage\n" );
            break;
        case  PDFWriter::Continuous :
            aLine.append( "/PageLayout/OneColumn\n" );
            break;
        case  PDFWriter::ContinuousFacing :
            // the flag m_aContext.FirstPageLeft below is used to set the page on the left side
            aLine.append( "/PageLayout/TwoColumnRight\n" );//odd page on the right side
            break;
        }
    if( m_aContext.PDFDocumentMode != PDFWriter::ModeDefault && !m_aContext.OpenInFullScreenMode )
        switch(  m_aContext.PDFDocumentMode )
        {
        default :
            aLine.append( "/PageMode/UseNone\n" );
            break;
        case PDFWriter::UseOutlines :
            aLine.append( "/PageMode/UseOutlines\n" ); //document is opened with outline pane open
            break;
        case PDFWriter::UseThumbs :
            aLine.append( "/PageMode/UseThumbs\n" ); //document is opened with thumbnails pane open
            break;
        }
    else if( m_aContext.OpenInFullScreenMode )
        aLine.append( "/PageMode/FullScreen\n" ); //document is opened full screen

    OStringBuffer aInitPageRef;
    if( m_aContext.InitialPage >= 0 && m_aContext.InitialPage < static_cast<sal_Int32>(m_aPages.size()) )
    {
        aInitPageRef.append( m_aPages[m_aContext.InitialPage].m_nPageObject );
        aInitPageRef.append( " 0 R" );
    }
    else
        aInitPageRef.append( "0" );

    switch( m_aContext.PDFDocumentAction )
    {
    case PDFWriter::ActionDefault :     //do nothing, this is the Acrobat default
    default:
        if( aInitPageRef.getLength() > 1 )
        {
            aLine.append( "/OpenAction[" );
            aLine.append( aInitPageRef.makeStringAndClear() );
            aLine.append( " /XYZ null null 0]\n" );
        }
        break;
    case PDFWriter::FitInWindow :
        aLine.append( "/OpenAction[" );
        aLine.append( aInitPageRef.makeStringAndClear() );
        aLine.append( " /Fit]\n" ); //Open fit page
        break;
    case PDFWriter::FitWidth :
        aLine.append( "/OpenAction[" );
        aLine.append( aInitPageRef.makeStringAndClear() );
        aLine.append( " /FitH " );
        aLine.append( g_nInheritedPageHeight );//Open fit width
        aLine.append( "]\n" );
        break;
    case PDFWriter::FitVisible :
        aLine.append( "/OpenAction[" );
        aLine.append( aInitPageRef.makeStringAndClear() );
        aLine.append( " /FitBH " );
        aLine.append( g_nInheritedPageHeight );//Open fit visible
        aLine.append( "]\n" );
        break;
    case PDFWriter::ActionZoom :
        aLine.append( "/OpenAction[" );
        aLine.append( aInitPageRef.makeStringAndClear() );
        aLine.append( " /XYZ null null " );
        if( m_aContext.Zoom >= 50 && m_aContext.Zoom <= 1600 )
            aLine.append( static_cast<double>(m_aContext.Zoom)/100.0 );
        else
            aLine.append( "0" );
        aLine.append( "]\n" );
        break;
    }

    // viewer preferences, if we had some, then emit
    if( m_aContext.HideViewerToolbar ||
        ( m_aContext.Version > PDFWriter::PDFVersion::PDF_1_3 && !m_aContext.DocumentInfo.Title.isEmpty() && m_aContext.DisplayPDFDocumentTitle ) ||
        m_aContext.HideViewerMenubar ||
        m_aContext.HideViewerWindowControls || m_aContext.FitWindow ||
        m_aContext.CenterWindow || (m_aContext.FirstPageLeft  &&  m_aContext.PageLayout == PDFWriter::ContinuousFacing ) ||
        m_aContext.OpenInFullScreenMode )
    {
        aLine.append( "/ViewerPreferences<<" );
        if( m_aContext.HideViewerToolbar )
            aLine.append( "/HideToolbar true\n" );
        if( m_aContext.HideViewerMenubar )
            aLine.append( "/HideMenubar true\n" );
        if( m_aContext.HideViewerWindowControls )
            aLine.append( "/HideWindowUI true\n" );
        if( m_aContext.FitWindow )
            aLine.append( "/FitWindow true\n" );
        if( m_aContext.CenterWindow )
            aLine.append( "/CenterWindow true\n" );
        if( m_aContext.Version > PDFWriter::PDFVersion::PDF_1_3 && !m_aContext.DocumentInfo.Title.isEmpty() && m_aContext.DisplayPDFDocumentTitle )
            aLine.append( "/DisplayDocTitle true\n" );
        if( m_aContext.FirstPageLeft &&  m_aContext.PageLayout == PDFWriter::ContinuousFacing )
            aLine.append( "/Direction/R2L\n" );
        if( m_aContext.OpenInFullScreenMode )
            switch( m_aContext.PDFDocumentMode )
            {
            default :
            case PDFWriter::ModeDefault :
                aLine.append( "/NonFullScreenPageMode/UseNone\n" );
                break;
            case PDFWriter::UseOutlines :
                aLine.append( "/NonFullScreenPageMode/UseOutlines\n" );
                break;
            case PDFWriter::UseThumbs :
                aLine.append( "/NonFullScreenPageMode/UseThumbs\n" );
                break;
            }
        aLine.append( ">>\n" );
    }

    if( nOutlineDict )
    {
        aLine.append( "/Outlines " );
        aLine.append( nOutlineDict );
        aLine.append( " 0 R\n" );
    }
    if( nStructureDict )
    {
        aLine.append( "/StructTreeRoot " );
        aLine.append( nStructureDict );
        aLine.append( " 0 R\n" );
    }
    if( !m_aContext.DocumentLocale.Language.isEmpty() )
    {
        /* PDF allows only RFC 3066, see above in emitStructure(). */
        LanguageTag aLanguageTag( m_aContext.DocumentLocale);
        OUString aLanguage, aScript, aCountry;
        aLanguageTag.getIsoLanguageScriptCountry( aLanguage, aScript, aCountry);
        if (!aLanguage.isEmpty())
        {
            OUStringBuffer aLocBuf( 16 );
            aLocBuf.append( aLanguage );
            if( !aCountry.isEmpty() )
            {
                aLocBuf.append( '-' );
                aLocBuf.append( aCountry );
            }
            aLine.append( "/Lang" );
            appendLiteralStringEncrypt( aLocBuf.makeStringAndClear(), m_nCatalogObject, aLine );
            aLine.append( "\n" );
        }
    }
    if( m_aContext.Tagged && m_aContext.Version > PDFWriter::PDFVersion::PDF_1_3 )
    {
        aLine.append( "/MarkInfo<</Marked true>>\n" );
    }
    if( !m_aWidgets.empty() )
    {
        aLine.append( "/AcroForm<</Fields[\n" );
        int nWidgets = m_aWidgets.size();
        int nOut = 0;
        for( int j = 0; j < nWidgets; j++ )
        {
            // output only root fields
            if( m_aWidgets[j].m_nParent < 1 )
            {
                aLine.append( m_aWidgets[j].m_nObject );
                aLine.append( (nOut++ % 5)==4 ? " 0 R\n" : " 0 R " );
            }
        }
        aLine.append( "\n]" );

#if HAVE_FEATURE_NSS
        if (m_nSignatureObject != -1)
            aLine.append( "/SigFlags 3");
#endif

        aLine.append( "/DR " );
        aLine.append( getResourceDictObj() );
        aLine.append( " 0 R" );
        // NeedAppearances must not be used if PDF is signed
        if( m_bIsPDF_A1 || m_bIsPDF_A2
#if HAVE_FEATURE_NSS
            || ( m_nSignatureObject != -1 )
#endif
            )
            aLine.append( ">>\n" );
        else
            aLine.append( "/NeedAppearances true>>\n" );
    }

    //check if there is a Metadata object
    if( nOutputIntentObject )
    {
        aLine.append("/OutputIntents[");
        aLine.append( nOutputIntentObject );
        aLine.append( " 0 R]" );
    }

    if( nMetadataObject )
    {
        aLine.append("/Metadata ");
        aLine.append( nMetadataObject );
        aLine.append( " 0 R" );
    }

    aLine.append( ">>\n"
                  "endobj\n\n" );
    return writeBuffer( aLine.getStr(), aLine.getLength() );
}

#if HAVE_FEATURE_NSS

bool PDFWriterImpl::emitSignature()
{
    if( !updateObject( m_nSignatureObject ) )
        return false;

    OStringBuffer aLine( 0x5000 );
    aLine.append( m_nSignatureObject );
    aLine.append( " 0 obj\n" );
    aLine.append("<</Contents <" );

    sal_uInt64 nOffset = ~0U;
    CHECK_RETURN( (osl::File::E_None == m_aFile.getPos(nOffset) ) );

    m_nSignatureContentOffset = nOffset + aLine.getLength();

    // reserve some space for the PKCS#7 object
    OStringBuffer aContentFiller( MAX_SIGNATURE_CONTENT_LENGTH );
    comphelper::string::padToLength(aContentFiller, MAX_SIGNATURE_CONTENT_LENGTH, '0');
    aLine.append( aContentFiller.makeStringAndClear() );
    aLine.append( ">\n/Type/Sig/SubFilter/adbe.pkcs7.detached");

    if( !m_aContext.DocumentInfo.Author.isEmpty() )
    {
        aLine.append( "/Name" );
        appendUnicodeTextStringEncrypt( m_aContext.DocumentInfo.Author, m_nSignatureObject, aLine );
    }

    aLine.append( " /M ");
    appendLiteralStringEncrypt( m_aCreationDateString, m_nSignatureObject, aLine );

    aLine.append( " /ByteRange [ 0 ");
    aLine.append( m_nSignatureContentOffset - 1 );
    aLine.append( " " );
    aLine.append( m_nSignatureContentOffset + MAX_SIGNATURE_CONTENT_LENGTH + 1 );
    aLine.append( " " );

    m_nSignatureLastByteRangeNoOffset = nOffset + aLine.getLength();

    // mark the last ByteRange no and add some space. Now, we don't know
    // how many bytes we need for this ByteRange value
    // The real value will be overwritten in the finalizeSignature method
    OStringBuffer aByteRangeFiller( 100  );
    comphelper::string::padToLength(aByteRangeFiller, 100, ' ');
    aLine.append( aByteRangeFiller.makeStringAndClear() );
    aLine.append("  /Filter/Adobe.PPKMS");

    //emit reason, location and contactinfo
    if ( !m_aContext.SignReason.isEmpty() )
    {
        aLine.append("/Reason");
        appendUnicodeTextStringEncrypt( m_aContext.SignReason, m_nSignatureObject, aLine );
    }

    if ( !m_aContext.SignLocation.isEmpty() )
    {
        aLine.append("/Location");
        appendUnicodeTextStringEncrypt( m_aContext.SignLocation, m_nSignatureObject, aLine );
    }

    if ( !m_aContext.SignContact.isEmpty() )
    {
        aLine.append("/ContactInfo");
        appendUnicodeTextStringEncrypt( m_aContext.SignContact, m_nSignatureObject, aLine );
    }

    aLine.append(" >>\nendobj\n\n" );

    return writeBuffer( aLine.getStr(), aLine.getLength() );
}

bool PDFWriterImpl::finalizeSignature()
{
    if (!m_aContext.SignCertificate.is())
        return false;

    // 1- calculate last ByteRange value
    sal_uInt64 nOffset = ~0U;
    CHECK_RETURN( (osl::File::E_None == m_aFile.getPos(nOffset) ) );

    sal_Int64 nLastByteRangeNo = nOffset - (m_nSignatureContentOffset + MAX_SIGNATURE_CONTENT_LENGTH + 1);

    // 2- overwrite the value to the m_nSignatureLastByteRangeNoOffset position
    sal_uInt64 nWritten = 0;
    CHECK_RETURN( (osl::File::E_None == m_aFile.setPos(osl_Pos_Absolut, m_nSignatureLastByteRangeNoOffset) ) );
    OString aByteRangeNo = OString::number( nLastByteRangeNo ) + " ]";

    if (m_aFile.write(aByteRangeNo.getStr(), aByteRangeNo.getLength(), nWritten) != osl::File::E_None)
    {
        CHECK_RETURN( (osl::File::E_None == m_aFile.setPos(osl_Pos_Absolut, nOffset)) );
        return false;
    }

    // 3- create the PKCS#7 object using NSS

    // Prepare buffer and calculate PDF file digest
    CHECK_RETURN( (osl::File::E_None == m_aFile.setPos(osl_Pos_Absolut, 0)) );

    std::unique_ptr<char[]> buffer1(new char[m_nSignatureContentOffset + 1]);
    sal_uInt64 bytesRead1;

    //FIXME: Check if hash is calculated from the correct byterange
    if (osl::File::E_None != m_aFile.read(buffer1.get(), m_nSignatureContentOffset - 1 , bytesRead1) ||
        bytesRead1 != static_cast<sal_uInt64>(m_nSignatureContentOffset) - 1)
    {
        SAL_WARN("vcl.pdfwriter", "First buffer read failed");
        return false;
    }

    std::unique_ptr<char[]> buffer2(new char[nLastByteRangeNo + 1]);
    sal_uInt64 bytesRead2;

    if (osl::File::E_None != m_aFile.setPos(osl_Pos_Absolut, m_nSignatureContentOffset + MAX_SIGNATURE_CONTENT_LENGTH + 1) ||
        osl::File::E_None != m_aFile.read(buffer2.get(), nLastByteRangeNo, bytesRead2) ||
        bytesRead2 != static_cast<sal_uInt64>(nLastByteRangeNo))
    {
        SAL_WARN("vcl.pdfwriter", "Second buffer read failed");
        return false;
    }

    OStringBuffer aCMSHexBuffer;
    svl::crypto::Signing aSigning(m_aContext.SignCertificate);
    aSigning.AddDataRange(buffer1.get(), bytesRead1);
    aSigning.AddDataRange(buffer2.get(), bytesRead2);
    aSigning.SetSignTSA(m_aContext.SignTSA);
    aSigning.SetSignPassword(m_aContext.SignPassword);
    if (!aSigning.Sign(aCMSHexBuffer))
    {
        SAL_WARN("vcl.pdfwriter", "PDFWriter::Sign() failed");
        return false;
    }

    assert(aCMSHexBuffer.getLength() <= MAX_SIGNATURE_CONTENT_LENGTH);

    // Set file pointer to the m_nSignatureContentOffset, we're ready to overwrite PKCS7 object
    nWritten = 0;
    CHECK_RETURN( (osl::File::E_None == m_aFile.setPos(osl_Pos_Absolut, m_nSignatureContentOffset)) );
    m_aFile.write(aCMSHexBuffer.getStr(), aCMSHexBuffer.getLength(), nWritten);

    return osl::File::E_None == m_aFile.setPos(osl_Pos_Absolut, nOffset);
}

#endif //HAVE_FEATURE_NSS

sal_Int32 PDFWriterImpl::emitInfoDict( )
{
    sal_Int32 nObject = createObject();

    if( updateObject( nObject ) )
    {
        OStringBuffer aLine( 1024 );
        aLine.append( nObject );
        aLine.append( " 0 obj\n"
                      "<<" );
        if( !m_aContext.DocumentInfo.Title.isEmpty() )
        {
            aLine.append( "/Title" );
            appendUnicodeTextStringEncrypt( m_aContext.DocumentInfo.Title, nObject, aLine );
            aLine.append( "\n" );
        }
        if( !m_aContext.DocumentInfo.Author.isEmpty() )
        {
            aLine.append( "/Author" );
            appendUnicodeTextStringEncrypt( m_aContext.DocumentInfo.Author, nObject, aLine );
            aLine.append( "\n" );
        }
        if( !m_aContext.DocumentInfo.Subject.isEmpty() )
        {
            aLine.append( "/Subject" );
            appendUnicodeTextStringEncrypt( m_aContext.DocumentInfo.Subject, nObject, aLine );
            aLine.append( "\n" );
        }
        if( !m_aContext.DocumentInfo.Keywords.isEmpty() )
        {
            aLine.append( "/Keywords" );
            appendUnicodeTextStringEncrypt( m_aContext.DocumentInfo.Keywords, nObject, aLine );
            aLine.append( "\n" );
        }
        if( !m_aContext.DocumentInfo.Creator.isEmpty() )
        {
            aLine.append( "/Creator" );
            appendUnicodeTextStringEncrypt( m_aContext.DocumentInfo.Creator, nObject, aLine );
            aLine.append( "\n" );
        }
        if( !m_aContext.DocumentInfo.Producer.isEmpty() )
        {
            aLine.append( "/Producer" );
            appendUnicodeTextStringEncrypt( m_aContext.DocumentInfo.Producer, nObject, aLine );
            aLine.append( "\n" );
        }

        aLine.append( "/CreationDate" );
        appendLiteralStringEncrypt( m_aCreationDateString, nObject, aLine );
        aLine.append( ">>\nendobj\n\n" );
        if( ! writeBuffer( aLine.getStr(), aLine.getLength() ) )
            nObject = 0;
    }
    else
        nObject = 0;

    return nObject;
}

// Part of this function may be shared with method appendDest.
sal_Int32 PDFWriterImpl::emitNamedDestinations()
{
    sal_Int32  nCount = m_aNamedDests.size();
    if( nCount <= 0 )
        return 0;//define internal error

    //get the object number for all the destinations
    sal_Int32 nObject = createObject();

    if( updateObject( nObject ) )
    {
        //emit the dictionary
        OStringBuffer aLine( 1024 );
        aLine.append( nObject );
        aLine.append( " 0 obj\n"
                      "<<" );

        sal_Int32  nDestID;
        for( nDestID = 0; nDestID < nCount; nDestID++ )
        {
            const PDFNamedDest& rDest   = m_aNamedDests[ nDestID ];
            // In order to correctly function both under an Internet browser and
            // directly with a reader (provided the reader has the feature) we
            // need to set the name of the destination the same way it will be encoded
            // in an Internet link
            INetURLObject aLocalURL( "http://ahost.ax" ); //dummy location, won't be used
            aLocalURL.SetMark( rDest.m_aDestName );

            const OUString aName   = aLocalURL.GetMark( INetURLObject::DecodeMechanism::NONE ); //same coding as
            // in link creation ( see PDFWriterImpl::emitLinkAnnotations )
            const PDFPage& rDestPage    = m_aPages[ rDest.m_nPage ];

            aLine.append( '/' );
            appendDestinationName( aName, aLine ); // this conversion must be done when forming the link to target ( see in emitCatalog )
            aLine.append( '[' ); // the '[' can be emitted immediately, because the appendDestinationName function
                                 //maps the preceding character properly
            aLine.append( rDestPage.m_nPageObject );
            aLine.append( " 0 R" );

            switch( rDest.m_eType )
            {
            case PDFWriter::DestAreaType::XYZ:
            default:
                aLine.append( "/XYZ " );
                appendFixedInt( rDest.m_aRect.Left(), aLine );
                aLine.append( ' ' );
                appendFixedInt( rDest.m_aRect.Bottom(), aLine );
                aLine.append( " 0" );
                break;
            case PDFWriter::DestAreaType::FitRectangle:
                aLine.append( "/FitR " );
                appendFixedInt( rDest.m_aRect.Left(), aLine );
                aLine.append( ' ' );
                appendFixedInt( rDest.m_aRect.Top(), aLine );
                aLine.append( ' ' );
                appendFixedInt( rDest.m_aRect.Right(), aLine );
                aLine.append( ' ' );
                appendFixedInt( rDest.m_aRect.Bottom(), aLine );
                break;
            }
            aLine.append( "]\n" );
        }

        //close
        aLine.append( ">>\nendobj\n\n" );
        if( ! writeBuffer( aLine.getStr(), aLine.getLength() ) )
            nObject = 0;
    }
    else
        nObject = 0;

    return nObject;
}

// emits the output intent dictionary
sal_Int32 PDFWriterImpl::emitOutputIntent()
{
    if( !m_bIsPDF_A1 && !m_bIsPDF_A2 )
        return 0;

    //emit the sRGB standard profile, in ICC format, in a stream, per IEC61966-2.1

    OStringBuffer aLine( 1024 );
    sal_Int32 nICCObject = createObject();
    sal_Int32 nStreamLengthObject = createObject();

    aLine.append( nICCObject );
// sRGB has 3 colors, hence /N 3 below (PDF 1.4 table 4.16)
    aLine.append( " 0 obj\n<</N 3/Length " );
    aLine.append( nStreamLengthObject );
    aLine.append( " 0 R" );
    if (!g_bDebugDisableCompression)
        aLine.append( "/Filter/FlateDecode" );
    aLine.append( ">>\nstream\n" );
    if ( !updateObject( nICCObject ) ) return 0;
    if ( !writeBuffer( aLine.getStr(), aLine.getLength() ) ) return 0;
    //get file position
    sal_uInt64 nBeginStreamPos = 0;
    if (osl::File::E_None != m_aFile.getPos(nBeginStreamPos))
        return 0;
    beginCompression();
    checkAndEnableStreamEncryption( nICCObject );
    cmsHPROFILE hProfile = cmsCreate_sRGBProfile();
    //force ICC profile version 2.1
    cmsSetProfileVersion(hProfile, 2.1);
    cmsUInt32Number nBytesNeeded = 0;
    cmsSaveProfileToMem(hProfile, nullptr, &nBytesNeeded);
    if (!nBytesNeeded)
      return 0;
    std::vector<unsigned char> aBuffer(nBytesNeeded);
    cmsSaveProfileToMem(hProfile, aBuffer.data(), &nBytesNeeded);
    cmsCloseProfile(hProfile);
    bool written = writeBuffer( aBuffer.data(), static_cast<sal_Int32>(aBuffer.size()) );
    disableStreamEncryption();
    endCompression();

    sal_uInt64 nEndStreamPos = 0;
    if (m_aFile.getPos(nEndStreamPos) != osl::File::E_None)
        return 0;

    if( !written )
        return 0;
    if( ! writeBuffer( "\nendstream\nendobj\n\n", 19 ) )
        return 0 ;
    aLine.setLength( 0 );

    //emit the stream leng