swdetect.cxx

/* -*- 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"swdetect.hxx"

#include<cppuhelper/supportsservice.hxx>
#include<com/sun/star/io/XInputStream.hpp>
#include<com/sun/star/uno/XComponentContext.hpp>
#include<sfx2/docfile.hxx>
#include<sot/storage.hxx>
#include<unotools/mediadescriptor.hxx>

usingnamespace ::com::sun::star;
usingnamespace ::com::sun::star::uno;
usingnamespace ::com::sun::star::io;
usingnamespace ::com::sun::star::task;
usingnamespace ::com::sun::star::beans;
usingnamespace ::com::sun::star::lang;
using utl::MediaDescriptor;

SwFilterDetect::SwFilterDetect()
{
}

SwFilterDetect::~SwFilterDetect()
{
}

OUString SAL_CALL SwFilterDetect::detect( Sequence< PropertyValue >& lDescriptor )
{
 MediaDescriptor aMediaDesc( lDescriptor );
 OUString aTypeName = aMediaDesc.getUnpackedValueOrDefault( MediaDescriptor::PROP_TYPENAME(), OUString() );
 uno::Reference< io::XInputStream > xInStream ( aMediaDesc[MediaDescriptor::PROP_INPUTSTREAM()], uno::UNO_QUERY );
if ( !xInStream.is() )
returnOUString();

 SfxMedium aMedium;
 aMedium.UseInteractionHandler( false );
 aMedium.setStreamToLoadFrom( xInStream, true );

 SvStream *pInStrm = aMedium.GetInStream();
if ( !pInStrm || pInStrm->GetError() )
returnOUString();

bool bIsDetected = false;

if ( aTypeName == "writer_Rich_Text_Format" )
 {
 pInStrm->Seek( STREAM_SEEK_TO_BEGIN );
 bIsDetected = ( read_uInt8s_ToOString( *pInStrm, 5 ) == "{\\rtf" );
 }
elseif ( aTypeName == "writer_MS_WinWord_5" )
 {
 pInStrm->Seek( STREAM_SEEK_TO_BEGIN );
const sal_uInt8 nBufSize = 3;
 sal_uInt8 nBuffer[ nBufSize ];
if (pInStrm->ReadBytes(nBuffer, nBufSize) < nBufSize)
returnOUString();

 bIsDetected = (nBuffer[0] == 0x9B && nBuffer[1] == 0xA5 && nBuffer[2] == 0x21) // WinWord 1
 || (nBuffer[0] == 0x9C && nBuffer[1] == 0xA5 && nBuffer[2] == 0x21) // PMWord 1
 || (nBuffer[0] == 0xDB && nBuffer[1] == 0xA5 && nBuffer[2] == 0x2D) // WinWord 2
 || (nBuffer[0] == 0xDC && nBuffer[1] == 0xA5 && nBuffer[2] == 0x65); // WinWord 6.0/95, as a single stream file
 }
else
 {
// Do not attempt to create an SotStorage on a
// 0-length stream as that would create the compound
// document header on the stream and effectively write to
// disk!
 pInStrm->Seek( STREAM_SEEK_TO_BEGIN );
if ( pInStrm->remainingSize() == 0 )
returnOUString();

try
 {
 tools::SvRef<SotStorage> aStorage = newSotStorage ( pInStrm, false );
if ( !aStorage->GetError() )
 {
 bIsDetected = aStorage->IsContained( "WordDocument" );
if ( bIsDetected && aTypeName.startsWith( "writer_MS_Word_97" ) )
 {
 bIsDetected = ( aStorage->IsContained("0Table") || aStorage->IsContained("1Table") );

// If we are checking the template type, and the document is not a .dot, don't
// mis-detect it.
if ( bIsDetected && aTypeName == "writer_MS_Word_97_Vorlage" )
 {
// Super ugly hack, but we don't want to use the whole WW8Fib thing here in
// the swd library, apparently. We know (do we?) that the "aBits1" byte, as
// the variable is called in WW8Fib::WW8Fib(SvStream&,sal_uInt8,sal_uInt32),
// is at offset 10 in the WordDocument stream. The fDot bit is bit 0x01 of
// that byte.
 tools::SvRef<SotStorageStream> xWordDocument = aStorage->OpenSotStream("WordDocument", StreamMode::STD_READ);
 xWordDocument->Seek( 10 );
if ( xWordDocument->Tell() == 10 )
 {
 sal_uInt8 aBits1;
 xWordDocument->ReadUChar( aBits1 );
// Check fDot bit
 bIsDetected = ((aBits1 & 0x01) == 0x01);
 }
 }
 }
 }
 }
catch (...)
 {
 bIsDetected = false;
 }
 }

if ( bIsDetected )
return aTypeName;

returnOUString();
}

/* XServiceInfo */
OUString SAL_CALL SwFilterDetect::getImplementationName()
{
return"com.sun.star.comp.writer.FormatDetector";
}

/* XServiceInfo */
sal_Bool SAL_CALL SwFilterDetect::supportsService( const OUString& sServiceName )
{
returncppu::supportsService(this, sServiceName);
}

/* XServiceInfo */
Sequence< OUString > SAL_CALL SwFilterDetect::getSupportedServiceNames()
{
return { "com.sun.star.frame.ExtendedTypeDetection", "com.sun.star.text.FormatDetector", "com.sun.star.text.W4WFormatDetector" };
}

extern"C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
com_sun_star_comp_writer_FormatDetector_get_implementation(css::uno::XComponentContext*,
 css::uno::Sequence<css::uno::Any> const &)
{
returncppu::acquire(newSwFilterDetect());
}

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