lwpfilter.cxx

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/*************************************************************************
 * @file
 * Circle object.
 ************************************************************************/
#include "lwpfilter.hxx"
#include <xfilter/xfglobal.hxx>
#include <xfilter/xfsaxstream.hxx>
#include "lwp9reader.hxx"
#include <lwpsvstream.hxx>
 
#include <tools/stream.hxx>
#include <com/sun/star/io/IOException.hpp>
#include <com/sun/star/text/XTextDocument.hpp>
 
#include <memory>
 
using namespace ::cppu;
using namespace ::com::sun::star::lang;
using namespace ::com::sun::star::text;
using namespace ::com::sun::star::io;
using namespace ::com::sun::star::beans;
using namespace ::com::sun::star;
 
#include "bento.hxx"
using namespace OpenStormBento;
#include "explode.hxx"
static bool Decompress(SvStream* pCompressed, SvStream*& pOutDecompressed)
{
    pCompressed->Seek(0);
    std::unique_ptr<SvMemoryStream> aDecompressed(new SvMemoryStream(4096, 4096));
    unsigned char buffer[512];
    pCompressed->ReadBytes(buffer, 16);
    aDecompressed->WriteBytes(buffer, 16);
 
    LwpSvStream aLwpStream(pCompressed);
    std::unique_ptr<OpenStormBento::LtcBenContainer> pBentoContainer;
    {
        sal_uLong ulRet = BenOpenContainer(&aLwpStream, &pBentoContainer);
        if (ulRet != BenErr_OK)
            return false;
    }
 
    std::unique_ptr<LtcUtBenValueStream> aWordProData(
        pBentoContainer->FindValueStreamWithPropertyName("WordProData"));
 
    if (!aWordProData)
        return false;
 
    // decompressing
    Decompression decompress(aWordProData.get(), aDecompressed.get());
    if (0 != decompress.explode())
        return false;
 
    sal_uInt32 nPos = aWordProData->GetSize();
    nPos += 0x10;
 
    pCompressed->Seek(nPos);
    while (sal_uInt32 iRead = pCompressed->ReadBytes(buffer, 512))
        aDecompressed->WriteBytes(buffer, iRead);
 
    // disable stream growing past its current size
    aDecompressed->SetResizeOffset(0);
 
    //transfer ownership of aDecompressed's ptr
    pOutDecompressed = aDecompressed.release();
    return true;
}
 
static bool GetLwpSvStream(SvStream* pStream, LwpSvStream*& pLwpSvStream)
{
    SvStream* pDecompressed = nullptr;
 
    pStream->Seek(0x10);
    sal_uInt32 nTag(0);
    pStream->ReadUInt32(nTag);
    if (nTag != 0x3750574c) // "LWP7"
    {
        // small file, needs decompression
        if (!Decompress(pStream, pDecompressed))
        {
            pLwpSvStream = nullptr;
            return true;
        }
        pStream->Seek(0);
        pDecompressed->Seek(0);
    }
 
    pLwpSvStream = nullptr;
    bool bCompressed = false;
    if (pDecompressed)
    {
        LwpSvStream* pOriginalLwpSvStream = new LwpSvStream(pStream);
        pLwpSvStream = new LwpSvStream(pDecompressed, pOriginalLwpSvStream);
        bCompressed = true;
    }
    else
    {
        pLwpSvStream = new LwpSvStream(pStream);
    }
    return bCompressed;
}
int ReadWordproFile(SvStream& rStream,
                    uno::Reference<css::xml::sax::XDocumentHandler> const& xHandler)
{
    int nRet = 0;
    try
    {
        LwpSvStream* pRawLwpSvStream = nullptr;
        std::unique_ptr<LwpSvStream> aLwpSvStream;
        std::unique_ptr<LwpSvStream> aCompressedLwpSvStream;
        std::unique_ptr<SvStream> aDecompressed;
        if (GetLwpSvStream(&rStream, pRawLwpSvStream) && pRawLwpSvStream)
        {
            SvStream* pDecompressed = pRawLwpSvStream->GetStream();
            if (pDecompressed)
            {
                aDecompressed.reset(pDecompressed);
                aCompressedLwpSvStream.reset(pRawLwpSvStream->GetCompressedStream());
            }
        }
 
        if (!pRawLwpSvStream)
        {
            // nothing returned, fail when uncompressing
            return 1;
        }
 
        aLwpSvStream.reset(pRawLwpSvStream);
 
        XFSaxStream aStrm(xHandler);
        Lwp9Reader reader(aLwpSvStream.get(), &aStrm);
        //Reset all static objects,because this function may be called many times.
        XFGlobalReset();
        const bool bOk = reader.Read();
        if (!bOk)
            nRet = 1;
    }
    catch (...)
    {
        return 1;
    }
    return nRet;
}
 
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