xmlgrhlp.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 <sal/config.h>
#include <sal/log.hxx>

#include <com/sun/star/embed/XTransactedObject.hpp>
#include <com/sun/star/embed/ElementModes.hpp>
#include <com/sun/star/beans/XPropertySet.hpp>
#include <com/sun/star/io/NotConnectedException.hpp>
#include <com/sun/star/lang/XServiceInfo.hpp>
#include <com/sun/star/lang/XInitialization.hpp>
#include <comphelper/fileformat.h>
#include <comphelper/graphicmimetype.hxx>
#include <cppuhelper/compbase.hxx>
#include <cppuhelper/implbase.hxx>
#include <cppuhelper/supportsservice.hxx>

#include <rtl/ref.hxx>
#include <unotools/ucbstreamhelper.hxx>
#include <unotools/streamwrap.hxx>
#include <unotools/tempfile.hxx>
#include <unotools/saveopt.hxx>
#include <vcl/gfxlink.hxx>
#include <vcl/metaact.hxx>
#include <tools/zcodec.hxx>

#include <vcl/GraphicObject.hxx>
#include <vcl/graphicfilter.hxx>
#include <svx/xmlgrhlp.hxx>
#include <svx/xmleohlp.hxx>

#include <algorithm>
#include <memory>
#include <utility>

using namespace com::sun::star;
using namespace com::sun::star::uno;
using namespace com::sun::star::io;

namespace com::sun::star::uno { class XComponentContext; }

#define XML_GRAPHICSTORAGE_NAME     "Pictures"
#define XML_GRAPHICOBJECT_URL_BASE  "vnd.sun.star.GraphicObject:"

namespace {

const MetaCommentAction* ImplCheckForEPS( GDIMetaFile const & rMtf )
{
    const MetaCommentAction* pComment = nullptr;

    if ( rMtf.GetActionSize() >= 2
            && rMtf.GetAction(0)->GetType() == MetaActionType::EPS
            && rMtf.GetAction(1)->GetType() == MetaActionType::COMMENT
            && ( static_cast<const MetaCommentAction*>(rMtf.GetAction( 1 ))->GetComment() == "EPSReplacementGraphic" ) )
        pComment = static_cast<const MetaCommentAction*>(rMtf.GetAction( 1 ));

    return pComment;
}

class GraphicInputStream : public cppu::WeakImplHelper<XInputStream>
{
private:
    virtual sal_Int32 SAL_CALL readBytes(Sequence<sal_Int8> & aData, sal_Int32 nBytesToRead) override;
    virtual sal_Int32 SAL_CALL readSomeBytes(Sequence<sal_Int8> & aData, sal_Int32 nMaxBytesToRead) override;
    virtual void SAL_CALL skipBytes(sal_Int32 nBytesToSkip) override;
    virtual sal_Int32 SAL_CALL available() override;
    virtual void SAL_CALL closeInput() override;

private:
    utl::TempFile maTempFile;
    Reference<XInputStream> mxStreamWrapper;

public:

    explicit GraphicInputStream(GraphicObject const & raGraphicObject, const OUString & rMimeType);
    GraphicInputStream(const GraphicInputStream&) = delete;

    GraphicInputStream& operator=(const GraphicInputStream&) = delete;

    bool exists() const
    {
        return mxStreamWrapper.is();
    }
};


GraphicInputStream::GraphicInputStream(GraphicObject const & aGraphicObject, const OUString & rMimeType)
{
    maTempFile.EnableKillingFile();

    if (aGraphicObject.GetType() != GraphicType::NONE)
    {
        std::unique_ptr<SvStream> pStream = ::utl::UcbStreamHelper::CreateStream(maTempFile.GetURL(), StreamMode::WRITE | StreamMode::TRUNC);

        if (pStream)
        {
            const Graphic& aGraphic(aGraphicObject.GetGraphic());
            const GfxLink aGfxLink(aGraphic.GetGfxLink());
            bool bRet = false;

            if (aGfxLink.GetDataSize() && aGfxLink.GetData())
            {
                if (rMimeType.isEmpty())
                {
                    pStream->WriteBytes(aGfxLink.GetData(), aGfxLink.GetDataSize());
                    bRet = (pStream->GetError() == ERRCODE_NONE);
                }
                else
                {
                    GraphicFilter &rFilter = GraphicFilter::GetGraphicFilter();
                    bRet = (rFilter.ExportGraphic(aGraphic, "", *pStream, rFilter.GetExportFormatNumberForMediaType(rMimeType)) == ERRCODE_NONE);
                }
            }
            else
            {
                if (aGraphic.GetType() == GraphicType::Bitmap)
                {
                    GraphicFilter & rFilter = GraphicFilter::GetGraphicFilter();
                    OUString aFormat = rMimeType;

                    if (aGraphic.IsAnimated())
                        aFormat = "image/gif";
                    else if (aFormat.isEmpty())
                        aFormat = "image/png";

                    bRet = (rFilter.ExportGraphic(aGraphic, "", *pStream, rFilter.GetExportFormatNumberForMediaType(aFormat)) == ERRCODE_NONE);
                }
                else if (rMimeType.isEmpty() && aGraphic.GetType() == GraphicType::GdiMetafile)
                {
                    pStream->SetVersion(SOFFICE_FILEFORMAT_8);
                    pStream->SetCompressMode(SvStreamCompressFlags::ZBITMAP);
                    const_cast<GDIMetaFile&>(aGraphic.GetGDIMetaFile()).Write(*pStream);
                    bRet = (pStream->GetError() == ERRCODE_NONE);
                }
                else if (!rMimeType.isEmpty())
                {
                    GraphicFilter & rFilter = GraphicFilter::GetGraphicFilter();
                    bRet = ( rFilter.ExportGraphic( aGraphic, "", *pStream, rFilter.GetExportFormatNumberForMediaType( rMimeType ) ) == ERRCODE_NONE );
                }
            }

            if (bRet)
            {
                pStream->Seek( 0 );
                mxStreamWrapper = new ::utl::OInputStreamWrapper(std::move(pStream));
            }
        }
    }
}

sal_Int32 SAL_CALL GraphicInputStream::readBytes(Sequence<sal_Int8> & rData, sal_Int32 nBytesToRead)
{
    if (!mxStreamWrapper.is())
        throw NotConnectedException();

    return mxStreamWrapper->readBytes(rData, nBytesToRead);
}

sal_Int32 SAL_CALL GraphicInputStream::readSomeBytes(Sequence<sal_Int8>& rData, sal_Int32 nMaxBytesToRead )
{
    if (!mxStreamWrapper.is())
        throw NotConnectedException() ;

    return mxStreamWrapper->readSomeBytes(rData, nMaxBytesToRead);
}

void SAL_CALL GraphicInputStream::skipBytes(sal_Int32 nBytesToSkip)
{
    if (!mxStreamWrapper.is())
        throw NotConnectedException();

    mxStreamWrapper->skipBytes(nBytesToSkip);
}

sal_Int32 SAL_CALL GraphicInputStream::available()
{
    if (!mxStreamWrapper.is())
        throw NotConnectedException();

    return mxStreamWrapper->available();
}

void SAL_CALL GraphicInputStream::closeInput()
{
    if (!mxStreamWrapper.is())
        throw NotConnectedException();

    mxStreamWrapper->closeInput();
}

class SvXMLGraphicOutputStream:
    public cppu::WeakImplHelper<XOutputStream>
{
private:

    // XOutputStream
    virtual void SAL_CALL           writeBytes( const Sequence< sal_Int8 >& rData ) override;
    virtual void SAL_CALL           flush() override;
    virtual void SAL_CALL           closeOutput() override;

private:

    std::unique_ptr<::utl::TempFile> mpTmp;
    std::unique_ptr<SvStream>        mpOStm;
    Reference< XOutputStream >       mxStmWrapper;
    std::unique_ptr<GraphicObject>   mxGrfObj;
    bool                             mbClosed;

public:

                                    SvXMLGraphicOutputStream();
    virtual                         ~SvXMLGraphicOutputStream() override;
                                    SvXMLGraphicOutputStream(const SvXMLGraphicOutputStream&) = delete;
    SvXMLGraphicOutputStream&       operator=(const SvXMLGraphicOutputStream&) = delete;

    bool                            Exists() const { return mxStmWrapper.is(); }
    const GraphicObject&            GetGraphicObject();
    Graphic GetGraphic();
};

SvXMLGraphicOutputStream::SvXMLGraphicOutputStream()
    : mpTmp(new ::utl::TempFile)
    , mxGrfObj(new GraphicObject)
    , mbClosed(false)
{
    mpTmp->EnableKillingFile();

    mpOStm = ::utl::UcbStreamHelper::CreateStream( mpTmp->GetURL(), StreamMode::WRITE | StreamMode::TRUNC );

    if( mpOStm )
        mxStmWrapper = new ::utl::OOutputStreamWrapper( *mpOStm );
}

SvXMLGraphicOutputStream::~SvXMLGraphicOutputStream()
{
    mpTmp.reset();
    mpOStm.reset();
}

void SAL_CALL SvXMLGraphicOutputStream::writeBytes( const Sequence< sal_Int8 >& rData )
{
    if( !mxStmWrapper.is() )
        throw NotConnectedException() ;

    mxStmWrapper->writeBytes( rData );
}

void SAL_CALL SvXMLGraphicOutputStream::flush()
{
    if( !mxStmWrapper.is() )
        throw NotConnectedException() ;

    mxStmWrapper->flush();
}

void SAL_CALL SvXMLGraphicOutputStream::closeOutput()
{
    if( !mxStmWrapper.is() )
        throw NotConnectedException() ;

    mxStmWrapper->closeOutput();
    mxStmWrapper.clear();

    mbClosed = true;
}

Graphic SvXMLGraphicOutputStream::GetGraphic()
{
    Graphic aGraphic;

    if (mbClosed && mxGrfObj->GetType() == GraphicType::NONE && mpOStm)
    {
        mpOStm->Seek( 0 );
        sal_uInt16 nFormat = GRFILTER_FORMAT_DONTKNOW;
        sal_uInt16 nDeterminedFormat = GRFILTER_FORMAT_DONTKNOW;
        GraphicFilter::GetGraphicFilter().ImportGraphic( aGraphic, "", *mpOStm ,nFormat,&nDeterminedFormat);

        if (nDeterminedFormat == GRFILTER_FORMAT_DONTKNOW)
        {
            //Read the first two byte to check whether it is a gzipped stream, is so it may be in wmz or emz format
            //unzip them and try again

            sal_uInt8    sFirstBytes[ 2 ];

            sal_uInt64 nStreamLen = mpOStm->TellEnd();
            mpOStm->Seek( 0 );

            if ( nStreamLen == 0 )
            {
                SvLockBytes* pLockBytes = mpOStm->GetLockBytes();
                if ( pLockBytes  )
                    pLockBytes->SetSynchronMode();

                nStreamLen = mpOStm->TellEnd();
                mpOStm->Seek( 0 );
            }
            if( nStreamLen >= 2 )
            {
                //read two byte
                mpOStm->ReadBytes(sFirstBytes, 2);

                if( sFirstBytes[0] == 0x1f && sFirstBytes[1] == 0x8b )
                {
                    std::unique_ptr<SvMemoryStream> pDest(new SvMemoryStream);
                    ZCodec aZCodec( 0x8000, 0x8000 );
                    aZCodec.BeginCompression(ZCODEC_DEFAULT_COMPRESSION, /*gzLib*/true);
                    mpOStm->Seek( 0 );
                    aZCodec.Decompress( *mpOStm, *pDest );

                    if (aZCodec.EndCompression())
                    {
                        sal_uInt64 nStreamLen_ = pDest->TellEnd();
                        if (nStreamLen_ > 0)
                        {
                            pDest->Seek(0);
                            GraphicFilter::GetGraphicFilter().ImportGraphic( aGraphic, "", *pDest ,nFormat,&nDeterminedFormat );
                        }
                    }
                }
            }
        }
    }

    if (aGraphic.GetType() != GraphicType::NONE)
    {
        mpOStm.reset();
        mpTmp.reset();
     }
    return aGraphic;
}

const GraphicObject& SvXMLGraphicOutputStream::GetGraphicObject()
{
    Graphic aGraphic(GetGraphic());
    if (aGraphic.GetType() != GraphicType::NONE)
    {
        mxGrfObj.reset(new GraphicObject(aGraphic));
    }
    return *mxGrfObj;
}

}

SvXMLGraphicHelper::SvXMLGraphicHelper(SvXMLGraphicHelperMode eCreateMode)
    : cppu::WeakComponentImplHelper<document::XGraphicObjectResolver,
                                    document::XGraphicStorageHandler,
                                    document::XBinaryStreamResolver>(maMutex)
{
    Init( nullptr, eCreateMode );
}

SvXMLGraphicHelper::SvXMLGraphicHelper()
    : cppu::WeakComponentImplHelper<document::XGraphicObjectResolver,
                                    document::XGraphicStorageHandler,
                                    document::XBinaryStreamResolver>(maMutex)
    , meCreateMode(SvXMLGraphicHelperMode::Read)
{
}

SvXMLGraphicHelper::~SvXMLGraphicHelper()
{
}

void SAL_CALL SvXMLGraphicHelper::disposing()
{
}

bool SvXMLGraphicHelper::ImplGetStreamNames( const OUString& rURLStr,
                                                 OUString& rPictureStorageName,
                                                 OUString& rPictureStreamName )
{
    if (rURLStr.isEmpty())
        return false;

    const OUString aURLStr {rURLStr.copy(rURLStr.lastIndexOf(':')+1)};

    if( !aURLStr.isEmpty() && aURLStr.indexOf('/')<0 ) // just one token?
    {
        rPictureStorageName = XML_GRAPHICSTORAGE_NAME;
        rPictureStreamName = aURLStr;
    }
    else
        SvXMLEmbeddedObjectHelper::splitObjectURL(aURLStr, rPictureStorageName, rPictureStreamName);

    SAL_WARN_IF(rPictureStreamName.isEmpty(), "svx", "SvXMLGraphicHelper::ImplInsertGraphicURL: invalid scheme: " << rURLStr);

    return !rPictureStreamName.isEmpty();
}

uno::Reference < embed::XStorage > SvXMLGraphicHelper::ImplGetGraphicStorage( const OUString& rStorageName )
{
    uno::Reference < embed::XStorage > xRetStorage;
    if( mxRootStorage.is() )
    {
        try
        {
            maCurStorageName = rStorageName;
            xRetStorage = mxRootStorage->openStorageElement(
                maCurStorageName,
                ( SvXMLGraphicHelperMode::Write == meCreateMode )
                    ? embed::ElementModes::READWRITE
                    : embed::ElementModes::READ );
        }
        catch ( uno::Exception& )
        {
        }
        //#i43196# try again to open the storage element - this time readonly
        if(!xRetStorage.is())
        {
            try
            {
                maCurStorageName = rStorageName;
                xRetStorage = mxRootStorage->openStorageElement( maCurStorageName, embed::ElementModes::READ );
            }
            catch ( uno::Exception& )
            {
            }
        }
    }

    return xRetStorage;
}

SvxGraphicHelperStream_Impl SvXMLGraphicHelper::ImplGetGraphicStream( const OUString& rPictureStorageName,
                                                              const OUString& rPictureStreamName )
{
    SvxGraphicHelperStream_Impl aRet;
    aRet.xStorage = ImplGetGraphicStorage( rPictureStorageName );

    if( aRet.xStorage.is() )
    {
        sal_Int32 nMode = embed::ElementModes::READ;
        if ( SvXMLGraphicHelperMode::Write == meCreateMode )
        {
            nMode = embed::ElementModes::READWRITE;
        }

        aRet.xStream = aRet.xStorage->openStreamElement( rPictureStreamName, nMode );
        if( aRet.xStream.is() && ( SvXMLGraphicHelperMode::Write == meCreateMode ) )
        {
            uno::Reference < beans::XPropertySet > xProps( aRet.xStream, uno::UNO_QUERY );
            xProps->setPropertyValue( "UseCommonStoragePasswordEncryption", uno::makeAny( true) );
        }
    }

    return aRet;
}

OUString SvXMLGraphicHelper::ImplGetGraphicMimeType( const OUString& rFileName )
{
    if( ( rFileName.getLength() >= 4 ) && ( rFileName[ rFileName.getLength() - 4 ] == '.' ) )
    {
        const OString aExt(OUStringToOString(rFileName.copy(rFileName.getLength() - 3),
            RTL_TEXTENCODING_ASCII_US));
        return comphelper::GraphicMimeTypeHelper::GetMimeTypeForExtension( aExt );
    }

    return OUString();
}

Graphic SvXMLGraphicHelper::ImplReadGraphic( const OUString& rPictureStorageName,
                                             const OUString& rPictureStreamName )
{
    Graphic aReturnGraphic;
    SvxGraphicHelperStream_Impl aStream( ImplGetGraphicStream( rPictureStorageName, rPictureStreamName ) );
    if (aStream.xStream.is())
    {
        GraphicFilter& rGraphicFilter = GraphicFilter::GetGraphicFilter();
        std::unique_ptr<SvStream> pStream(utl::UcbStreamHelper::CreateStream(aStream.xStream));
        Graphic aGraphic = rGraphicFilter.ImportUnloadedGraphic(*pStream);
        if (!aGraphic.IsNone())
            aReturnGraphic = aGraphic;
        else
            rGraphicFilter.ImportGraphic(aReturnGraphic, "", *pStream);
    }

    return aReturnGraphic;
}

void SvXMLGraphicHelper::Init( const uno::Reference < embed::XStorage >& rXMLStorage,
                               SvXMLGraphicHelperMode eCreateMode,
                               const OUString& rGraphicMimeType )
{
    mxRootStorage = rXMLStorage;
    meCreateMode = eCreateMode;
    maOutputMimeType = rGraphicMimeType;
}

rtl::Reference<SvXMLGraphicHelper> SvXMLGraphicHelper::Create( const uno::Reference < embed::XStorage >& rXMLStorage,
                                                SvXMLGraphicHelperMode eCreateMode )
{
    rtl::Reference<SvXMLGraphicHelper> pThis = new SvXMLGraphicHelper;
    pThis->Init( rXMLStorage, eCreateMode, OUString() );

    return pThis;
}

rtl::Reference<SvXMLGraphicHelper> SvXMLGraphicHelper::Create( SvXMLGraphicHelperMode eCreateMode,
                                              const OUString& rGraphicMimeType )
{
    rtl::Reference<SvXMLGraphicHelper> pThis = new SvXMLGraphicHelper;

    pThis->Init( nullptr, eCreateMode, rGraphicMimeType );

    return pThis;
}

namespace
{

void splitUserDataFromURL(OUString const & rWholeURL, OUString & rJustURL, OUString & rUserData)
{
    sal_Int32 nUser = rWholeURL.indexOf('?');
    if (nUser >= 0)
    {
        rJustURL = rWholeURL.copy(0, nUser);
        nUser++;
        rUserData = rWholeURL.copy(nUser);
    }
    else
    {
        rJustURL = rWholeURL;
    }
}

} // end anonymous namespace

// XGraphicObjectResolver
OUString SAL_CALL SvXMLGraphicHelper::resolveGraphicObjectURL( const OUString& /*rURL*/ )
{
    throw uno::RuntimeException("XGraphicObjectResolver has been removed in LibreOffice 6.1");
}

// XGraphicStorageHandler
uno::Reference<graphic::XGraphic> SAL_CALL SvXMLGraphicHelper::loadGraphic(OUString const & rURL)
{
    osl::MutexGuard aGuard(maMutex);

    uno::Reference<graphic::XGraphic> xGraphic;

    OUString aURLOnly;
    OUString aUserData;
    splitUserDataFromURL(rURL, aURLOnly, aUserData);

    auto aIterator = maGraphicObjects.find(aURLOnly);
    if (aIterator != maGraphicObjects.end())
    {
        return aIterator->second;
    }

    OUString aPictureStorageName, aPictureStreamName;

    if (ImplGetStreamNames(aURLOnly, aPictureStorageName, aPictureStreamName))
    {
        const GraphicObject aGraphicObject(ImplReadGraphic(aPictureStorageName, aPictureStreamName));

        if (aGraphicObject.GetType() != GraphicType::NONE)
        {
            xGraphic = aGraphicObject.GetGraphic().GetXGraphic();
            maGraphicObjects[aURLOnly] = xGraphic;
        }
    }

    return xGraphic;
}

uno::Reference<graphic::XGraphic> SAL_CALL SvXMLGraphicHelper::loadGraphicFromOutputStream(uno::Reference<io::XOutputStream> const & rxOutputStream)
{
    osl::MutexGuard aGuard(maMutex);

    uno::Reference<graphic::XGraphic> xGraphic;

    if ((SvXMLGraphicHelperMode::Read == meCreateMode) && rxOutputStream.is())
    {

        SvXMLGraphicOutputStream* pGraphicOutputStream = static_cast<SvXMLGraphicOutputStream*>(rxOutputStream.get());
        if (pGraphicOutputStream)
        {
            xGraphic = pGraphicOutputStream->GetGraphic().GetXGraphic();
        }
    }
    return xGraphic;
}

OUString SAL_CALL SvXMLGraphicHelper::saveGraphicByName(css::uno::Reference<css::graphic::XGraphic> const & rxGraphic,
                                                        OUString & rOutSavedMimeType, OUString const & rRequestName)
{
    return implSaveGraphic(rxGraphic, rOutSavedMimeType, rRequestName);
}

OUString SAL_CALL SvXMLGraphicHelper::saveGraphic(css::uno::Reference<css::graphic::XGraphic> const & rxGraphic)
{
    OUString aOutMimeType;
    return implSaveGraphic(rxGraphic, aOutMimeType, OUString());
}

OUString SvXMLGraphicHelper::implSaveGraphic(css::uno::Reference<css::graphic::XGraphic> const & rxGraphic,
                                             OUString & rOutSavedMimeType, OUString const & rRequestName)
{
    Graphic aGraphic(rxGraphic);

    auto aIterator = maExportGraphics.find(aGraphic);
    if (aIterator != maExportGraphics.end())
    {
        auto const & aURLAndMimePair = aIterator->second;
        rOutSavedMimeType = aURLAndMimePair.second;
        return aURLAndMimePair.first;
    }

    GraphicObject aGraphicObject(aGraphic);

    if (aGraphicObject.GetType() != GraphicType::NONE)
    {
        const GfxLink aGfxLink(aGraphic.GetGfxLink());
        OUString aExtension;
        bool bUseGfxLink = true;

        if (aGfxLink.GetDataSize())
        {
            switch (aGfxLink.GetType())
            {
                case GfxLinkType::EpsBuffer: aExtension = ".eps"; break;
                case GfxLinkType::NativeGif: aExtension = ".gif"; break;
                // #i15508# added BMP type for better exports (checked, works)
                case GfxLinkType::NativeBmp: aExtension = ".bmp"; break;
                case GfxLinkType::NativeJpg: aExtension = ".jpg"; break;
                case GfxLinkType::NativePng: aExtension = ".png"; break;
                case GfxLinkType::NativeTif: aExtension = ".tif"; break;
                case GfxLinkType::NativeWmf:
                    if (aGfxLink.IsEMF())
                        aExtension = ".emf";
                    else
                        aExtension = ".wmf";
                    break;
                case GfxLinkType::NativeMet: aExtension = ".met"; break;
                case GfxLinkType::NativePct: aExtension = ".pct"; break;
                case GfxLinkType::NativeSvg:
                    // backward-compat kludge: since no released OOo
                    // version to date can handle svg properly, wrap it up
                    // into an svm. slight catch22 here, since strict ODF
                    // conformance _recommends_ svg - then again, most old
                    // ODF consumers are believed to be OOo
                    if (SvtSaveOptions().GetODFSaneDefaultVersion() < SvtSaveOptions::ODFSVER_012
                        || SvtSaveOptions().GetODFSaneDefaultVersion() == SvtSaveOptions::ODFSVER_012_EXT_COMPAT)
                    {
                        bUseGfxLink = false;
                        aExtension = ".svm";
                    }
                    else
                    {
                        aExtension = ".svg";
                    }
                    break;
                case GfxLinkType::NativePdf: aExtension = ".pdf"; break;

                default:
                    aExtension = ".grf";
                break;
            }
        }
        else
        {
            if (aGraphicObject.GetType() == GraphicType::Bitmap)
            {
                if (aGraphicObject.IsAnimated())
                    aExtension = ".gif";
                else
                    aExtension = ".png";
            }
            else if (aGraphicObject.GetType() == GraphicType::GdiMetafile)
            {
                // SJ: first check if this metafile is just an eps file, then we will store the eps instead of svm
                GDIMetaFile& rMetafile(const_cast<GDIMetaFile&>(aGraphic.GetGDIMetaFile()));

                if (ImplCheckForEPS(rMetafile))
                    aExtension = ".eps";
                else
                    aExtension = ".svm";
            }
        }

        OUString rPictureStreamName;
        if (!rRequestName.isEmpty())
        {
            rPictureStreamName = rRequestName + aExtension;
        }
        else
        {
            OUString sId = OStringToOUString(aGraphicObject.GetUniqueID(), RTL_TEXTENCODING_ASCII_US);
            rPictureStreamName = sId + aExtension;
        }

        SvxGraphicHelperStream_Impl aStream(ImplGetGraphicStream(XML_GRAPHICSTORAGE_NAME, rPictureStreamName));

        if (aStream.xStream.is())
        {
            const OUString aMimeType(ImplGetGraphicMimeType(rPictureStreamName));
            uno::Reference<beans::XPropertySet> xProps(aStream.xStream, uno::UNO_QUERY);

            // set stream properties (MediaType/Compression)
            if (!aMimeType.isEmpty())
            {
                xProps->setPropertyValue("MediaType", uno::Any(aMimeType));
            }

            // picture formats that actually _do_ benefit from zip
            // storage compression
            // .svm pics gets compressed via ZBITMAP old-style stream
            // option below
            static const char* aCompressiblePics[] =
            {
                "image/svg+xml",
                "image/x-emf",
                "image/x-wmf",
                "image/tiff",
                "image/x-eps",
                "image/bmp",
                "image/x-pict"
            };

            bool bSuccess = false;

            bool bCompressed = aMimeType.isEmpty();
            if( !bCompressed )
            {
                for(const char* p : aCompressiblePics)
                {
                    if( aMimeType.equalsIgnoreAsciiCaseAscii(p) )
                    {
                        bCompressed = true;
                        break;
                    }
                }
            }

            xProps->setPropertyValue("Compressed", Any(bCompressed));

            std::unique_ptr<SvStream> pStream(utl::UcbStreamHelper::CreateStream(aStream.xStream));
            if (bUseGfxLink && aGfxLink.GetDataSize() && aGfxLink.GetData())
            {
                pStream->WriteBytes(aGfxLink.GetData(), aGfxLink.GetDataSize());
                rOutSavedMimeType = aMimeType;
                bSuccess = (pStream->GetError() == ERRCODE_NONE);
            }
            else
            {
                if (aGraphic.GetType() == GraphicType::Bitmap)
                {
                    GraphicFilter& rFilter = GraphicFilter::GetGraphicFilter();
                    OUString aFormat;

                    if (aGraphic.IsAnimated())
                    {
                        aFormat = "gif";
                    }
                    else
                    {
                        aFormat = "png";
                    }
                    rOutSavedMimeType = comphelper::GraphicMimeTypeHelper::GetMimeTypeForExtension(aFormat.toUtf8());

                    bSuccess = (rFilter.ExportGraphic(aGraphic, "", *pStream, rFilter.GetExportFormatNumberForShortName(aFormat)) == ERRCODE_NONE);
                }
                else if (aGraphic.GetType() == GraphicType::GdiMetafile)
                {
                    pStream->SetVersion(SOFFICE_FILEFORMAT_8);
                    pStream->SetCompressMode(SvStreamCompressFlags::ZBITMAP);
                    rOutSavedMimeType = comphelper::GraphicMimeTypeHelper::GetMimeTypeForExtension("svm");

                    // SJ: first check if this metafile is just an eps file, then we will store the eps instead of svm
                    GDIMetaFile& rMtf(const_cast<GDIMetaFile&>(aGraphic.GetGDIMetaFile()));
                    const MetaCommentAction* pComment = ImplCheckForEPS(rMtf);
                    if (pComment)
                    {
                        sal_uInt32 nSize = pComment->GetDataSize();
                        const sal_uInt8* pData = pComment->GetData();
                        if (nSize && pData)
                            pStream->WriteBytes(pData, nSize);

                        const MetaEPSAction* pAct = static_cast<const MetaEPSAction*>(rMtf.FirstAction());
                        const GfxLink& rLink = pAct->GetLink();

                        pStream->WriteBytes(rLink.GetData(), rLink.GetDataSize());
                    }
                    else
                    {
                        rMtf.Write(*pStream);
                    }

                    bSuccess = (pStream->GetError() == ERRCODE_NONE);
                }
            }

            if (!bSuccess)
                return OUString();

            uno::Reference<embed::XTransactedObject> xStorage(aStream.xStorage, uno::UNO_QUERY);
            pStream.reset();
            aStream.xStream->getOutputStream()->closeOutput();
            if (xStorage.is())
                xStorage->commit();

            OUString aStoragePath = "Pictures/" + rPictureStreamName;

            // put into cache
            maExportGraphics[aGraphic] = std::make_pair(aStoragePath, rOutSavedMimeType);

            return aStoragePath;
        }
    }

    return OUString();
}

uno::Reference<io::XInputStream> SAL_CALL SvXMLGraphicHelper::createInputStream(uno::Reference<graphic::XGraphic> const & rxGraphic)
{
    Reference<XInputStream> xInputStream;

    Graphic aGraphic(rxGraphic);
    GraphicObject aGraphicObject(aGraphic);

    if (SvXMLGraphicHelperMode::Write == meCreateMode)
    {
        OUString sMimeType = comphelper::GraphicMimeTypeHelper::GetMimeTypeForExtension(OUStringToOString(maOutputMimeType, RTL_TEXTENCODING_ASCII_US));
        std::unique_ptr<GraphicInputStream> pInputStream(new GraphicInputStream(aGraphicObject, sMimeType));

        // We release the pointer from unique_ptr and assign it to the input stream return type.
        // In case the stream doesn't exists, unique_ptr will delete the pointer when we go out of scope.
        if (pInputStream->exists())
            xInputStream = pInputStream.release();
    }

    return xInputStream;
}

// XBinaryStreamResolver
Reference< XInputStream > SAL_CALL SvXMLGraphicHelper::getInputStream( const OUString& /*rURL*/ )
{
    Reference<XInputStream> xRet;
    return xRet;
}

Reference< XOutputStream > SAL_CALL SvXMLGraphicHelper::createOutputStream()
{
    Reference< XOutputStream > xRet;

    if( SvXMLGraphicHelperMode::Read == meCreateMode )
    {
        std::unique_ptr<SvXMLGraphicOutputStream> pOutputStream(new SvXMLGraphicOutputStream);

        if( pOutputStream->Exists() )
        {
            xRet = pOutputStream.release();
            maGrfStms.push_back( xRet );
        }
    }

    return xRet;
}

OUString SAL_CALL SvXMLGraphicHelper::resolveOutputStream( const Reference< XOutputStream >& rxBinaryStream )
{
    OUString aRet;

    if( ( SvXMLGraphicHelperMode::Read == meCreateMode ) && rxBinaryStream.is() )
    {
        if( ::std::find( maGrfStms.begin(), maGrfStms.end(), rxBinaryStream ) != maGrfStms.end() )
        {
            SvXMLGraphicOutputStream* pOStm = static_cast< SvXMLGraphicOutputStream* >( rxBinaryStream.get() );

            if( pOStm )
            {
                const GraphicObject& rGrfObj = pOStm->GetGraphicObject();
                const OUString aId(OStringToOUString(
                    rGrfObj.GetUniqueID(), RTL_TEXTENCODING_ASCII_US));

                if( !aId.isEmpty() )
                {
                    aRet = XML_GRAPHICOBJECT_URL_BASE + aId;
                }
            }
        }
    }

    return aRet;
}

// for instantiation via service manager
namespace {

namespace impl
{
typedef cppu::WeakComponentImplHelper<lang::XInitialization,
                                        document::XGraphicObjectResolver,
                                        document::XGraphicStorageHandler,
                                        document::XBinaryStreamResolver,
                                        lang::XServiceInfo>
    SvXMLGraphicImportExportHelper_Base;

class MutexContainer
{
public:
    virtual ~MutexContainer();

protected:
    mutable ::osl::Mutex m_aMutex;
};

MutexContainer::~MutexContainer()
{}

} // namespace impl

class SvXMLGraphicImportExportHelper :
    public impl::MutexContainer,
    public impl::SvXMLGraphicImportExportHelper_Base
{
public:
    explicit SvXMLGraphicImportExportHelper( SvXMLGraphicHelperMode eMode );

protected:
    // is called from WeakComponentImplHelper when XComponent::dispose() was
    // called from outside
    virtual void SAL_CALL disposing() override;

    // ____ XInitialization ____
    // one argument is allowed, which is the XStorage
    virtual void SAL_CALL initialize( const Sequence< Any >& aArguments ) override;

    // ____ XGraphicObjectResolver ____
    virtual OUString SAL_CALL resolveGraphicObjectURL( const OUString& aURL ) override;

    // ____ XGraphicStorageHandler ____
    virtual css::uno::Reference<css::graphic::XGraphic> SAL_CALL
        loadGraphic(const OUString& aURL) override;

    virtual css::uno::Reference<css::graphic::XGraphic> SAL_CALL
        loadGraphicFromOutputStream(css::uno::Reference<css::io::XOutputStream> const & rxOutputStream) override;

    virtual OUString SAL_CALL
        saveGraphic(css::uno::Reference<css::graphic::XGraphic> const & rxGraphic) override;

    virtual OUString SAL_CALL
        saveGraphicByName(css::uno::Reference<css::graphic::XGraphic> const & rxGraphic, OUString & rOutSavedMimeType, OUString const & rRequestName) override;

    virtual css::uno::Reference<css::io::XInputStream> SAL_CALL
        createInputStream(css::uno::Reference<css::graphic::XGraphic> const & rxGraphic) override;

    // ____ XBinaryStreamResolver ____
    virtual Reference< io::XInputStream > SAL_CALL getInputStream( const OUString& aURL ) override;
    virtual Reference< io::XOutputStream > SAL_CALL createOutputStream() override;
    virtual OUString SAL_CALL resolveOutputStream( const Reference< io::XOutputStream >& aBinaryStream ) override;

    // ____ XServiceInfo ____
    virtual OUString SAL_CALL getImplementationName() override;
    virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override;
    virtual Sequence< OUString > SAL_CALL getSupportedServiceNames() override;

private:
    SvXMLGraphicHelperMode              m_eGraphicHelperMode;
    Reference< XGraphicObjectResolver > m_xGraphicObjectResolver;
    Reference< XGraphicStorageHandler > m_xGraphicStorageHandler;
    Reference< XBinaryStreamResolver >  m_xBinaryStreamResolver;
};

SvXMLGraphicImportExportHelper::SvXMLGraphicImportExportHelper( SvXMLGraphicHelperMode eMode ) :
        impl::SvXMLGraphicImportExportHelper_Base( m_aMutex ),
        m_eGraphicHelperMode( eMode )
{}

void SAL_CALL SvXMLGraphicImportExportHelper::disposing()
{
    Reference< XComponent > xComp( m_xGraphicObjectResolver, UNO_QUERY );
    OSL_ASSERT( xComp.is());
    if( xComp.is())
        xComp->dispose();
    // m_xBinaryStreamResolver and m_xGraphicStorageHandler are a reference to the same object,
    // don't call dispose() again
}

// ____ XInitialization ____
void SAL_CALL SvXMLGraphicImportExportHelper::initialize(
    const Sequence< Any >& aArguments )
{
    Reference< embed::XStorage > xStorage;
    if( aArguments.hasElements() )
        aArguments[0] >>= xStorage;

    rtl::Reference<SvXMLGraphicHelper> pHelper( SvXMLGraphicHelper::Create( xStorage, m_eGraphicHelperMode ));
    m_xGraphicObjectResolver.set( pHelper.get() );
    m_xGraphicStorageHandler.set( pHelper.get() );
    m_xBinaryStreamResolver.set( pHelper.get() );
}

// ____ XGraphicObjectResolver ____
OUString SAL_CALL SvXMLGraphicImportExportHelper::resolveGraphicObjectURL( const OUString& aURL )
{
    return m_xGraphicObjectResolver->resolveGraphicObjectURL( aURL );
}

// ____ XGraphicStorageHandler ____
uno::Reference<graphic::XGraphic> SAL_CALL SvXMLGraphicImportExportHelper::loadGraphic(OUString const & rURL)
{
    return m_xGraphicStorageHandler->loadGraphic(rURL);
}

uno::Reference<graphic::XGraphic> SAL_CALL SvXMLGraphicImportExportHelper::loadGraphicFromOutputStream(uno::Reference<io::XOutputStream> const & rxOutputStream)
{
    return m_xGraphicStorageHandler->loadGraphicFromOutputStream(rxOutputStream);
}

OUString SAL_CALL SvXMLGraphicImportExportHelper::saveGraphic(css::uno::Reference<css::graphic::XGraphic> const & rxGraphic)
{
    return m_xGraphicStorageHandler->saveGraphic(rxGraphic);
}

OUString SAL_CALL SvXMLGraphicImportExportHelper::saveGraphicByName(css::uno::Reference<css::graphic::XGraphic> const & rxGraphic,
                                                                    OUString & rOutSavedMimeType, OUString const & rRequestName)
{
    return m_xGraphicStorageHandler->saveGraphicByName(rxGraphic, rOutSavedMimeType, rRequestName);
}

uno::Reference<io::XInputStream> SAL_CALL SvXMLGraphicImportExportHelper::createInputStream(uno::Reference<graphic::XGraphic> const & rxGraphic)
{
    return m_xGraphicStorageHandler->createInputStream(rxGraphic);
}

// ____ XBinaryStreamResolver ____
Reference< io::XInputStream > SAL_CALL SvXMLGraphicImportExportHelper::getInputStream( const OUString& aURL )
{
    return m_xBinaryStreamResolver->getInputStream( aURL );
}
Reference< io::XOutputStream > SAL_CALL SvXMLGraphicImportExportHelper::createOutputStream()
{
    return m_xBinaryStreamResolver->createOutputStream();
}
OUString SAL_CALL SvXMLGraphicImportExportHelper::resolveOutputStream( const Reference< io::XOutputStream >& aBinaryStream )
{
    return m_xBinaryStreamResolver->resolveOutputStream( aBinaryStream );
}

// ____ XServiceInfo ____
OUString SAL_CALL SvXMLGraphicImportExportHelper::getImplementationName()
{
    if( m_eGraphicHelperMode == SvXMLGraphicHelperMode::Read )
        return "com.sun.star.comp.Svx.GraphicImportHelper";
    return "com.sun.star.comp.Svx.GraphicExportHelper";
}

sal_Bool SAL_CALL SvXMLGraphicImportExportHelper::supportsService( const OUString& ServiceName )
{
    return cppu::supportsService(this, ServiceName);
}

Sequence< OUString > SAL_CALL SvXMLGraphicImportExportHelper::getSupportedServiceNames()
{
    return { "com.sun.star.document.GraphicObjectResolver",
             "com.sun.star.document.GraphicStorageHandler",
             "com.sun.star.document.BinaryStreamResolver" };
}

}

extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface *
com_sun_star_comp_Svx_GraphicImportHelper_get_implementation(
    css::uno::XComponentContext *,
    css::uno::Sequence<css::uno::Any> const &)
{
    return cppu::acquire(new SvXMLGraphicImportExportHelper(SvXMLGraphicHelperMode::Read));
}

extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface *
com_sun_star_comp_Svx_GraphicExportHelper_get_implementation(
    css::uno::XComponentContext *,
    css::uno::Sequence<css::uno::Any> const &)
{
    return cppu::acquire(new SvXMLGraphicImportExportHelper(SvXMLGraphicHelperMode::Write));
}

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