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Diffstat (limited to 'oox/source/ole/olestorage.cxx')
| -rw-r--r-- | oox/source/ole/olestorage.cxx | 379 |
1 files changed, 379 insertions, 0 deletions
diff --git a/oox/source/ole/olestorage.cxx b/oox/source/ole/olestorage.cxx new file mode 100644 index 000000000..82aa1cd79 --- /dev/null +++ b/oox/source/ole/olestorage.cxx @@ -0,0 +1,379 @@ +/* -*- 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 <oox/ole/olestorage.hxx> + +#include <com/sun/star/container/XNameContainer.hpp> +#include <com/sun/star/embed/XTransactedObject.hpp> +#include <com/sun/star/io/IOException.hpp> +#include <com/sun/star/io/NotConnectedException.hpp> +#include <com/sun/star/io/TempFile.hpp> +#include <com/sun/star/io/XInputStream.hpp> +#include <com/sun/star/io/XOutputStream.hpp> +#include <com/sun/star/io/XSeekable.hpp> +#include <com/sun/star/io/XStream.hpp> +#include <com/sun/star/lang/XMultiServiceFactory.hpp> +#include <com/sun/star/uno/XComponentContext.hpp> +#include <cppuhelper/implbase.hxx> +#include <osl/diagnose.h> +#include <oox/helper/binaryinputstream.hxx> +#include <oox/helper/binaryoutputstream.hxx> +#include <oox/helper/containerhelper.hxx> + +namespace oox::ole { + +using namespace ::com::sun::star::container; +using namespace ::com::sun::star::embed; +using namespace ::com::sun::star::io; +using namespace ::com::sun::star::lang; +using namespace ::com::sun::star::uno; + +namespace { + +/** Implementation of an OLE storage output stream that inserts itself into the + storage when it is closed. + */ +class OleOutputStream : public ::cppu::WeakImplHelper< XSeekable, XOutputStream > +{ +public: + explicit OleOutputStream( + const Reference< XComponentContext >& rxContext, + const Reference< XNameContainer >& rxStorage, + const OUString& rElementName ); + + virtual void SAL_CALL seek( sal_Int64 nPos ) override; + virtual sal_Int64 SAL_CALL getPosition() override; + virtual sal_Int64 SAL_CALL getLength() override; + + virtual void SAL_CALL writeBytes( const Sequence< sal_Int8 >& rData ) override; + virtual void SAL_CALL flush() override; + virtual void SAL_CALL closeOutput() override; + +private: + /// @throws IOException + void ensureSeekable() const; + /// @throws NotConnectedException + void ensureConnected() const; + +private: + Reference< XNameContainer > mxStorage; + Reference< XStream > mxTempFile; + Reference< XOutputStream > mxOutStrm; + Reference< XSeekable > mxSeekable; + OUString maElementName; +}; + +OleOutputStream::OleOutputStream( const Reference< XComponentContext >& rxContext, + const Reference< XNameContainer >& rxStorage, const OUString& rElementName ) : + mxStorage( rxStorage ), + maElementName( rElementName ) +{ + try + { + mxTempFile.set( TempFile::create(rxContext), UNO_QUERY_THROW ); + mxOutStrm = mxTempFile->getOutputStream(); + mxSeekable.set( mxOutStrm, UNO_QUERY ); + } + catch(const Exception& ) + { + } +} + +void SAL_CALL OleOutputStream::seek( sal_Int64 nPos ) +{ + ensureSeekable(); + mxSeekable->seek( nPos ); +} + +sal_Int64 SAL_CALL OleOutputStream::getPosition() +{ + ensureSeekable(); + return mxSeekable->getPosition(); +} + +sal_Int64 SAL_CALL OleOutputStream::getLength() +{ + ensureSeekable(); + return mxSeekable->getLength(); +} + +void SAL_CALL OleOutputStream::writeBytes( const Sequence< sal_Int8 >& rData ) +{ + ensureConnected(); + mxOutStrm->writeBytes( rData ); +} + +void SAL_CALL OleOutputStream::flush() +{ + ensureConnected(); + mxOutStrm->flush(); +} + +void SAL_CALL OleOutputStream::closeOutput() +{ + ensureConnected(); + ensureSeekable(); + // remember the class members + Reference< XOutputStream > xOutStrm = mxOutStrm; + Reference< XSeekable > xSeekable = mxSeekable; + // reset all class members + mxOutStrm.clear(); + mxSeekable.clear(); + // close stream (and let it throw something if needed) + xOutStrm->closeOutput(); + // on success, insert the stream into the OLE storage (must be seek-ed back before) + xSeekable->seek( 0 ); + if( !ContainerHelper::insertByName( mxStorage, maElementName, Any( mxTempFile ) ) ) + throw IOException(); +} + +void OleOutputStream::ensureSeekable() const +{ + if( !mxSeekable.is() ) + throw IOException(); +} + +void OleOutputStream::ensureConnected() const +{ + if( !mxOutStrm.is() ) + throw NotConnectedException(); +} + +} // namespace + +OleStorage::OleStorage( const Reference< XComponentContext >& rxContext, + const Reference< XInputStream >& rxInStream, bool bBaseStreamAccess ) : + StorageBase( rxInStream, bBaseStreamAccess ), + mxContext( rxContext ), + mpParentStorage( nullptr ) +{ + OSL_ENSURE( mxContext.is(), "OleStorage::OleStorage - missing component context" ); + initStorage( rxInStream ); +} + +OleStorage::OleStorage( const Reference< XComponentContext >& rxContext, + const Reference< XStream >& rxOutStream, bool bBaseStreamAccess ) : + StorageBase( rxOutStream, bBaseStreamAccess ), + mxContext( rxContext ), + mpParentStorage( nullptr ) +{ + OSL_ENSURE( mxContext.is(), "OleStorage::OleStorage - missing component context" ); + initStorage( rxOutStream ); +} + +OleStorage::OleStorage( const OleStorage& rParentStorage, + const Reference< XNameContainer >& rxStorage, const OUString& rElementName, bool bReadOnly ) : + StorageBase( rParentStorage, rElementName, bReadOnly ), + mxContext( rParentStorage.mxContext ), + mxStorage( rxStorage ), + mpParentStorage( &rParentStorage ) +{ + OSL_ENSURE( mxStorage.is(), "OleStorage::OleStorage - missing substorage elements" ); +} + +OleStorage::OleStorage( const OleStorage& rParentStorage, + const Reference< XStream >& rxOutStream, const OUString& rElementName ) : + StorageBase( rParentStorage, rElementName, false ), + mxContext( rParentStorage.mxContext ), + mpParentStorage( &rParentStorage ) +{ + initStorage( rxOutStream ); +} + +OleStorage::~OleStorage() +{ +} + +void OleStorage::initStorage( const Reference< XInputStream >& rxInStream ) +{ + // if stream is not seekable, create temporary copy + Reference< XInputStream > xInStrm = rxInStream; + if( !Reference< XSeekable >( xInStrm, UNO_QUERY ).is() ) try + { + Reference< XStream > xTempFile( TempFile::create(mxContext), UNO_QUERY_THROW ); + { + Reference< XOutputStream > xOutStrm( xTempFile->getOutputStream(), UNO_SET_THROW ); + /* Pass false to both binary stream objects to keep the UNO + streams alive. Life time of these streams is controlled by the + tempfile implementation. */ + BinaryXOutputStream aOutStrm( xOutStrm, false ); + BinaryXInputStream aInStrm( xInStrm, false ); + aInStrm.copyToStream( aOutStrm ); + } // scope closes output stream of tempfile + xInStrm = xTempFile->getInputStream(); + } + catch(const Exception& ) + { + OSL_FAIL( "OleStorage::initStorage - cannot create temporary copy of input stream" ); + } + + // create base storage object + if( xInStrm.is() ) try + { + Reference< XMultiServiceFactory > xFactory( mxContext->getServiceManager(), UNO_QUERY_THROW ); + Sequence< Any > aArgs( 2 ); + aArgs[ 0 ] <<= xInStrm; + aArgs[ 1 ] <<= true; // true = do not create a copy of the input stream + mxStorage.set( xFactory->createInstanceWithArguments("com.sun.star.embed.OLESimpleStorage", aArgs ), UNO_QUERY_THROW ); + } + catch(const Exception& ) + { + } +} + +void OleStorage::initStorage( const Reference< XStream >& rxOutStream ) +{ + // create base storage object + if( rxOutStream.is() ) try + { + Reference< XMultiServiceFactory > xFactory( mxContext->getServiceManager(), UNO_QUERY_THROW ); + Sequence< Any > aArgs( 2 ); + aArgs[ 0 ] <<= rxOutStream; + aArgs[ 1 ] <<= true; // true = do not create a copy of the stream + mxStorage.set( xFactory->createInstanceWithArguments("com.sun.star.embed.OLESimpleStorage", aArgs ), UNO_QUERY_THROW ); + } + catch(const Exception& ) + { + } +} + +// StorageBase interface ------------------------------------------------------ + +bool OleStorage::implIsStorage() const +{ + if( mxStorage.is() ) try + { + /* If this is not an OLE storage, hasElements() of the OLESimpleStorage + implementation throws an exception. But we do not return the result + of hasElements(), because an empty storage is a valid storage too. */ + (void)mxStorage->hasElements(); + return true; + } + catch(const Exception& ) + { + } + return false; +} + +Reference< XStorage > OleStorage::implGetXStorage() const +{ + OSL_FAIL( "OleStorage::getXStorage - not implemented" ); + return Reference< XStorage >(); +} + +void OleStorage::implGetElementNames( ::std::vector< OUString >& orElementNames ) const +{ + Sequence< OUString > aNames; + if( mxStorage.is() ) try + { + aNames = mxStorage->getElementNames(); + if( aNames.hasElements() ) + orElementNames.insert( orElementNames.end(), aNames.begin(), aNames.end() ); + } + catch(const Exception& ) + { + } +} + +StorageRef OleStorage::implOpenSubStorage( const OUString& rElementName, bool bCreateMissing ) +{ + StorageRef xSubStorage; + if( mxStorage.is() && !rElementName.isEmpty() ) + { + try + { + Reference< XNameContainer > xSubElements( mxStorage->getByName( rElementName ), UNO_QUERY_THROW ); + xSubStorage.reset( new OleStorage( *this, xSubElements, rElementName, true ) ); + } + catch(const Exception& ) + { + } + + /* The OLESimpleStorage API implementation seems to be buggy in the + area of writable inplace substorage (sometimes it overwrites other + unrelated streams with zero bytes). We go the save way and create a + new OLE storage based on a temporary file. All operations are + performed on this clean storage. On committing, the storage will be + completely re-inserted into the parent storage. */ + if( !isReadOnly() && (bCreateMissing || xSubStorage) ) try + { + // create new storage based on a temp file + Reference< XStream > xTempFile( TempFile::create(mxContext), UNO_QUERY_THROW ); + StorageRef xTempStorage( new OleStorage( *this, xTempFile, rElementName ) ); + // copy existing substorage into temp storage + if( xSubStorage ) + xSubStorage->copyStorageToStorage( *xTempStorage ); + // return the temp storage to caller + xSubStorage = xTempStorage; + } + catch(const Exception& ) + { + } + } + return xSubStorage; +} + +Reference< XInputStream > OleStorage::implOpenInputStream( const OUString& rElementName ) +{ + Reference< XInputStream > xInStream; + if( mxStorage.is() ) try + { + xInStream.set( mxStorage->getByName( rElementName ), UNO_QUERY ); + } + catch(const Exception& ) + { + } + return xInStream; +} + +Reference< XOutputStream > OleStorage::implOpenOutputStream( const OUString& rElementName ) +{ + Reference< XOutputStream > xOutStream; + if( mxStorage.is() && !rElementName.isEmpty() ) + xOutStream.set( new OleOutputStream( mxContext, mxStorage, rElementName ) ); + return xOutStream; +} + +void OleStorage::implCommit() const +{ + try + { + // commit this storage (finalizes the file this storage is based on) + Reference< XTransactedObject >( mxStorage, UNO_QUERY_THROW )->commit(); + // re-insert this storage into the parent storage + if( mpParentStorage ) + { + if( mpParentStorage->mxStorage->hasByName( getName() ) ) + { + // replaceByName() does not work (#i109539#) + mpParentStorage->mxStorage->removeByName( getName() ); + Reference< XTransactedObject >( mpParentStorage->mxStorage, UNO_QUERY_THROW )->commit(); + } + mpParentStorage->mxStorage->insertByName( getName(), Any( mxStorage ) ); + // this requires another commit(), which will be performed by the parent storage + } + } + catch(const Exception& ) + { + } +} + +} // namespace oox::ole + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |