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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: biffdetector.cxx,v $
* $Revision: 1.3.22.1 $
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#include "oox/xls/biffdetector.hxx"
#include <algorithm>
#include <rtl/strbuf.hxx>
#include <com/sun/star/io/XInputStream.hpp>
#include <comphelper/mediadescriptor.hxx>
#include "oox/helper/binaryinputstream.hxx"
#include "oox/helper/olestorage.hxx"
using ::rtl::OUString;
using ::rtl::OStringBuffer;
using ::com::sun::star::uno::Reference;
using ::com::sun::star::uno::Sequence;
using ::com::sun::star::uno::Exception;
using ::com::sun::star::uno::RuntimeException;
using ::com::sun::star::uno::XInterface;
using ::com::sun::star::uno::UNO_QUERY;
using ::com::sun::star::lang::XMultiServiceFactory;
using ::com::sun::star::beans::PropertyValue;
using ::com::sun::star::io::XInputStream;
using ::comphelper::MediaDescriptor;
namespace oox {
namespace xls {
// ============================================================================
Sequence< OUString > BiffDetector_getSupportedServiceNames()
{
Sequence< OUString > aServiceNames( 1 );
aServiceNames[ 0 ] = CREATE_OUSTRING( "com.sun.star.frame.ExtendedTypeDetection" );
return aServiceNames;
}
OUString BiffDetector_getImplementationName()
{
return CREATE_OUSTRING( "com.sun.star.comp.oox.BiffDetector" );
}
Reference< XInterface > SAL_CALL BiffDetector_createInstance( const Reference< XMultiServiceFactory >& rxFactory ) throw( Exception )
{
return static_cast< ::cppu::OWeakObject* >( new BiffDetector( rxFactory ) );
}
// ============================================================================
BiffDetector::BiffDetector( const Reference< XMultiServiceFactory >& rxFactory ) :
mxFactory( rxFactory )
{
}
BiffDetector::~BiffDetector()
{
}
BiffType BiffDetector::detectStreamBiffVersion( BinaryInputStream& rInStream )
{
BiffType eBiff = BIFF_UNKNOWN;
if( !rInStream.isEof() && rInStream.isSeekable() && (rInStream.getLength() > 4) )
{
sal_Int64 nOldPos = rInStream.tell();
rInStream.seek( 0 );
sal_uInt16 nBofId, nBofSize;
rInStream >> nBofId >> nBofSize;
if( (4 <= nBofSize) && (nBofSize <= 16) && (rInStream.tell() + nBofSize <= rInStream.getLength()) )
{
switch( nBofId )
{
case BIFF2_ID_BOF:
eBiff = BIFF2;
break;
case BIFF3_ID_BOF:
eBiff = BIFF3;
break;
case BIFF4_ID_BOF:
eBiff = BIFF4;
break;
case BIFF5_ID_BOF:
{
if( 6 <= nBofSize )
{
sal_uInt16 nVersion;
rInStream >> nVersion;
// #i23425# #i44031# #i62752# there are some *really* broken documents out there...
switch( nVersion & 0xFF00 )
{
case 0: eBiff = BIFF5; break; // #i44031# #i62752#
case BIFF_BOF_BIFF2: eBiff = BIFF2; break;
case BIFF_BOF_BIFF3: eBiff = BIFF3; break;
case BIFF_BOF_BIFF4: eBiff = BIFF4; break;
case BIFF_BOF_BIFF5: eBiff = BIFF5; break;
case BIFF_BOF_BIFF8: eBiff = BIFF8; break;
default: OSL_ENSURE( false,
OStringBuffer( "lclDetectStreamBiffVersion - unknown BIFF version: 0x" ).
append( static_cast< sal_Int32 >( nVersion ), 16 ).getStr() );
}
}
}
break;
// else do nothing, no BIFF stream
}
}
rInStream.seek( nOldPos );
}
return eBiff;
}
BiffType BiffDetector::detectStorageBiffVersion( OUString& orWorkbookStreamName, StorageRef xStorage )
{
static const OUString saBookName = CREATE_OUSTRING( "Book" );
static const OUString saWorkbookName = CREATE_OUSTRING( "Workbook" );
BiffType eBiff = BIFF_UNKNOWN;
if( xStorage.get() )
{
if( xStorage->isStorage() )
{
// try to open the "Book" stream
BinaryXInputStream aBookStrm5( xStorage->openInputStream( saBookName ), true );
BiffType eBookStrm5Biff = detectStreamBiffVersion( aBookStrm5 );
// try to open the "Workbook" stream
BinaryXInputStream aBookStrm8( xStorage->openInputStream( saWorkbookName ), true );
BiffType eBookStrm8Biff = detectStreamBiffVersion( aBookStrm8 );
// decide which stream to use
if( (eBookStrm8Biff != BIFF_UNKNOWN) && ((eBookStrm5Biff == BIFF_UNKNOWN) || (eBookStrm8Biff > eBookStrm5Biff)) )
{
/* Only "Workbook" stream exists; or both streams exist,
and "Workbook" has higher BIFF version than "Book" stream. */
eBiff = eBookStrm8Biff;
orWorkbookStreamName = saWorkbookName;
}
else if( eBookStrm5Biff != BIFF_UNKNOWN )
{
/* Only "Book" stream exists; or both streams exist,
and "Book" has higher BIFF version than "Workbook" stream. */
eBiff = eBookStrm5Biff;
orWorkbookStreamName = saBookName;
}
}
else
{
// no storage, try plain input stream from medium (even for BIFF5+)
BinaryXInputStream aStrm( xStorage->openInputStream( OUString() ), false );
eBiff = detectStreamBiffVersion( aStrm );
orWorkbookStreamName = OUString();
}
}
return eBiff;
}
// com.sun.star.lang.XServiceInfo interface -----------------------------------
OUString SAL_CALL BiffDetector::getImplementationName() throw( RuntimeException )
{
return BiffDetector_getImplementationName();
}
sal_Bool SAL_CALL BiffDetector::supportsService( const OUString& rService ) throw( RuntimeException )
{
const Sequence< OUString > aServices( BiffDetector_getSupportedServiceNames() );
const OUString* pArray = aServices.getConstArray();
const OUString* pArrayEnd = pArray + aServices.getLength();
return ::std::find( pArray, pArrayEnd, rService ) != pArrayEnd;
}
Sequence< OUString > SAL_CALL BiffDetector::getSupportedServiceNames() throw( RuntimeException )
{
return BiffDetector_getSupportedServiceNames();
}
// com.sun.star.document.XExtendedFilterDetect interface ----------------------
OUString SAL_CALL BiffDetector::detect( Sequence< PropertyValue >& rDescriptor ) throw( RuntimeException )
{
OUString aTypeName;
MediaDescriptor aDescriptor( rDescriptor );
aDescriptor.addInputStream();
Reference< XInputStream > xInStrm( aDescriptor[ MediaDescriptor::PROP_INPUTSTREAM() ], UNO_QUERY );
if( xInStrm.is() )
{
OUString aWorkbookName;
StorageRef xStorage( new OleStorage( mxFactory, xInStrm, true ) );
switch( detectStorageBiffVersion( aWorkbookName, xStorage ) )
{
case BIFF2:
case BIFF3:
case BIFF4: aTypeName = CREATE_OUSTRING( "calc_MS_Excel_40" ); break;
case BIFF5: aTypeName = CREATE_OUSTRING( "calc_MS_Excel_95" ); break;
case BIFF8: aTypeName = CREATE_OUSTRING( "calc_MS_Excel_97" ); break;
default:;
}
}
return aTypeName;
}
// ============================================================================
} // namespace xls
} // namespace oox
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