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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/.
*/
#include "exceldetect.hxx"
#include <com/sun/star/io/XInputStream.hpp>
#include <com/sun/star/ucb/ContentCreationException.hpp>
#include <com/sun/star/uno/XComponentContext.hpp>
#include <cppuhelper/supportsservice.hxx>
#include <sfx2/docfile.hxx>
#include <unotools/mediadescriptor.hxx>
#include <sot/storage.hxx>
#include <tools/diagnose_ex.h>
using namespace com::sun::star;
using utl::MediaDescriptor;
ScExcelBiffDetect::ScExcelBiffDetect() {}
ScExcelBiffDetect::~ScExcelBiffDetect() {}
OUString ScExcelBiffDetect::getImplementationName()
{
return "com.sun.star.comp.calc.ExcelBiffFormatDetector";
}
sal_Bool ScExcelBiffDetect::supportsService( const OUString& aName )
{
return cppu::supportsService(this, aName);
}
uno::Sequence<OUString> ScExcelBiffDetect::getSupportedServiceNames()
{
return { "com.sun.star.frame.ExtendedTypeDetection" };
}
namespace {
bool hasStream(const uno::Reference<io::XInputStream>& xInStream, const OUString& rName)
{
SfxMedium aMedium;
aMedium.UseInteractionHandler(false);
aMedium.setStreamToLoadFrom(xInStream, true);
SvStream* pStream = aMedium.GetInStream();
if (!pStream)
return false;
sal_uInt64 const nSize = pStream->TellEnd();
pStream->Seek(0);
if (!nSize)
{
// 0-size stream. Failed.
return false;
}
try
{
tools::SvRef<SotStorage> xStorage = new SotStorage(pStream, false);
if (!xStorage.is() || xStorage->GetError())
return false;
return xStorage->IsStream(rName);
}
catch (const css::ucb::ContentCreationException &)
{
TOOLS_WARN_EXCEPTION("sc", "hasStream");
}
return false;
}
/**
* We detect BIFF 2, 3 and 4 file types together since the only thing that
* set them apart is the BOF ID.
*/
bool isExcel40(const uno::Reference<io::XInputStream>& xInStream)
{
SfxMedium aMedium;
aMedium.UseInteractionHandler(false);
aMedium.setStreamToLoadFrom(xInStream, true);
SvStream* pStream = aMedium.GetInStream();
if (!pStream)
return false;
sal_uInt64 const nSize = pStream->TellEnd();
pStream->Seek(0);
if (nSize < 4)
return false;
sal_uInt16 nBofId, nBofSize;
pStream->ReadUInt16( nBofId ).ReadUInt16( nBofSize );
switch (nBofId)
{
case 0x0009: // Excel 2.1 worksheet (BIFF 2)
case 0x0209: // Excel 3.0 worksheet (BIFF 3)
case 0x0409: // Excel 4.0 worksheet (BIFF 4)
case 0x0809: // Excel 5.0 worksheet (BIFF 5), some apps create such files (fdo#70100)
break;
default:
return false;
}
if (nBofSize < 4 || 16 < nBofSize)
// BOF record must be sized between 4 and 16 for BIFF 2, 3 and 4.
return false;
sal_uInt64 const nPos = pStream->Tell();
if (nSize - nPos < nBofSize)
// BOF record doesn't have required bytes.
return false;
return true;
}
bool isTemplate(std::u16string_view rType)
{
return rType.find(u"_VorlageTemplate") != std::u16string_view::npos;
}
}
OUString ScExcelBiffDetect::detect( uno::Sequence<beans::PropertyValue>& lDescriptor )
{
MediaDescriptor aMediaDesc(lDescriptor);
OUString aType;
aMediaDesc[MediaDescriptor::PROP_TYPENAME] >>= aType;
if (aType.isEmpty())
// Type is not given. We can't proceed.
return OUString();
aMediaDesc.addInputStream();
uno::Reference<io::XInputStream> xInStream(aMediaDesc[MediaDescriptor::PROP_INPUTSTREAM], uno::UNO_QUERY);
if (!xInStream.is())
// No input stream.
return OUString();
if (aType == "calc_MS_Excel_97" || aType == "calc_MS_Excel_97_VorlageTemplate")
{
// See if this stream is an Excel 97/XP/2003 (BIFF8) stream.
if (!hasStream(xInStream, "Workbook"))
// BIFF8 is expected to contain a stream named "Workbook".
return OUString();
aMediaDesc[MediaDescriptor::PROP_FILTERNAME] <<= isTemplate(aType) ? OUString("MS Excel 97 Vorlage/Template") : OUString("MS Excel 97");
}
else if (aType == "calc_MS_Excel_95" || aType == "calc_MS_Excel_95_VorlageTemplate")
{
// See if this stream is an Excel 95 (BIFF5) stream.
if (!hasStream(xInStream, "Book"))
return OUString();
aMediaDesc[MediaDescriptor::PROP_FILTERNAME] <<= isTemplate(aType) ? OUString("MS Excel 95 Vorlage/Template") : OUString("MS Excel 95");
}
else if (aType == "calc_MS_Excel_5095" || aType == "calc_MS_Excel_5095_VorlageTemplate")
{
// See if this stream is an Excel 5.0/95 stream.
if (!hasStream(xInStream, "Book"))
return OUString();
aMediaDesc[MediaDescriptor::PROP_FILTERNAME] <<= isTemplate(aType) ? OUString("MS Excel 5.0/95 Vorlage/Template") : OUString("MS Excel 5.0/95");
}
else if (aType == "calc_MS_Excel_40" || aType == "calc_MS_Excel_40_VorlageTemplate")
{
// See if this stream is an Excel 4.0 stream.
if (!isExcel40(xInStream))
return OUString();
aMediaDesc[MediaDescriptor::PROP_FILTERNAME] <<= isTemplate(aType) ? OUString("MS Excel 4.0 Vorlage/Template") : OUString("MS Excel 4.0");
}
else
// Nothing to detect.
return OUString();
aMediaDesc >> lDescriptor;
return aType;
}
extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
com_sun_star_comp_calc_ExcelBiffFormatDetector_get_implementation(css::uno::XComponentContext* /*context*/,
css::uno::Sequence<css::uno::Any> const &)
{
return cppu::acquire(new ScExcelBiffDetect);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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