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Diffstat (limited to 'io/source/stm/omark.cxx')
| -rw-r--r-- | io/source/stm/omark.cxx | 801 |
1 files changed, 801 insertions, 0 deletions
diff --git a/io/source/stm/omark.cxx b/io/source/stm/omark.cxx new file mode 100644 index 000000000..0c7a82142 --- /dev/null +++ b/io/source/stm/omark.cxx @@ -0,0 +1,801 @@ +/* -*- 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 <map> +#include <memory> + +#include <com/sun/star/io/BufferSizeExceededException.hpp> +#include <com/sun/star/io/NotConnectedException.hpp> +#include <com/sun/star/io/XMarkableStream.hpp> +#include <com/sun/star/io/XOutputStream.hpp> +#include <com/sun/star/io/XInputStream.hpp> +#include <com/sun/star/io/XActiveDataSource.hpp> +#include <com/sun/star/io/XActiveDataSink.hpp> +#include <com/sun/star/io/XConnectable.hpp> +#include <com/sun/star/lang/IllegalArgumentException.hpp> +#include <com/sun/star/lang/XServiceInfo.hpp> + +#include <cppuhelper/weak.hxx> +#include <cppuhelper/implbase.hxx> +#include <cppuhelper/supportsservice.hxx> + +#include <osl/mutex.hxx> +#include <osl/diagnose.h> + + +using namespace ::std; +using namespace ::cppu; +using namespace ::osl; +using namespace ::com::sun::star::io; +using namespace ::com::sun::star::uno; +using namespace ::com::sun::star::lang; + +#include <services.hxx> +#include "streamhelper.hxx" + +namespace io_stm { + +namespace { + +/*********************** +* +* OMarkableOutputStream. +* +* This object allows to set marks in an outputstream. It is allowed to jump back to the marks and +* rewrite the same bytes. +* +* The object must buffer the data since the last mark set. Flush will not +* have any effect. As soon as the last mark has been removed, the object may write the data +* through to the chained object. +* +**********************/ +class OMarkableOutputStream : + public WeakImplHelper< XOutputStream , + XActiveDataSource , + XMarkableStream , + XConnectable, + XServiceInfo + > +{ +public: + OMarkableOutputStream( ); + +public: // XOutputStream + virtual void SAL_CALL writeBytes(const Sequence< sal_Int8 >& aData) override; + virtual void SAL_CALL flush() override; + virtual void SAL_CALL closeOutput() override; + +public: // XMarkable + virtual sal_Int32 SAL_CALL createMark() override; + virtual void SAL_CALL deleteMark(sal_Int32 Mark) override; + virtual void SAL_CALL jumpToMark(sal_Int32 nMark) override; + virtual void SAL_CALL jumpToFurthest() override; + virtual sal_Int32 SAL_CALL offsetToMark(sal_Int32 nMark) override; + +public: // XActiveDataSource + virtual void SAL_CALL setOutputStream(const Reference < XOutputStream > & aStream) override; + virtual Reference < XOutputStream > SAL_CALL getOutputStream() override; + +public: // XConnectable + virtual void SAL_CALL setPredecessor(const Reference < XConnectable > & aPredecessor) override; + virtual Reference < XConnectable > SAL_CALL getPredecessor() override; + virtual void SAL_CALL setSuccessor(const Reference < XConnectable >& aSuccessor) override; + virtual Reference< XConnectable > SAL_CALL getSuccessor() override; + +public: // XServiceInfo + OUString SAL_CALL getImplementationName() override; + Sequence< OUString > SAL_CALL getSupportedServiceNames() override; + sal_Bool SAL_CALL supportsService(const OUString& ServiceName) override; + +private: + // helper methods + /// @throws NotConnectedException + /// @throws BufferSizeExceededException + void checkMarksAndFlush(); + + Reference< XConnectable > m_succ; + Reference< XConnectable > m_pred; + + Reference< XOutputStream > m_output; + bool m_bValidStream; + + std::unique_ptr<MemRingBuffer> m_pBuffer; + map<sal_Int32,sal_Int32,less< sal_Int32 > > m_mapMarks; + sal_Int32 m_nCurrentPos; + sal_Int32 m_nCurrentMark; + + Mutex m_mutex; +}; + +} + +OMarkableOutputStream::OMarkableOutputStream( ) + : m_bValidStream(false) + , m_pBuffer( new MemRingBuffer ) + , m_nCurrentPos(0) + , m_nCurrentMark(0) +{ +} + +// XOutputStream +void OMarkableOutputStream::writeBytes(const Sequence< sal_Int8 >& aData) +{ + if( !m_bValidStream ) { + throw NotConnectedException(); + } + if( m_mapMarks.empty() && ( m_pBuffer->getSize() == 0 ) ) { + // no mark and buffer active, simple write through + m_output->writeBytes( aData ); + } + else { + MutexGuard guard( m_mutex ); + // new data must be buffered + m_pBuffer->writeAt( m_nCurrentPos , aData ); + m_nCurrentPos += aData.getLength(); + checkMarksAndFlush(); + } + +} + +void OMarkableOutputStream::flush() +{ + Reference< XOutputStream > output; + { + MutexGuard guard( m_mutex ); + output = m_output; + } + + // Markable cannot flush buffered data, because the data may get rewritten, + // however one can forward the flush to the chained stream to give it + // a chance to write data buffered in the chained stream. + if( output.is() ) + { + output->flush(); + } +} + +void OMarkableOutputStream::closeOutput() +{ + if( !m_bValidStream ) { + throw NotConnectedException(); + } + MutexGuard guard( m_mutex ); + // all marks must be cleared and all + + m_mapMarks.clear(); + m_nCurrentPos = m_pBuffer->getSize(); + checkMarksAndFlush(); + + m_output->closeOutput(); + + setOutputStream( Reference< XOutputStream > () ); + setPredecessor( Reference < XConnectable >() ); + setSuccessor( Reference< XConnectable > () ); + +} + + +sal_Int32 OMarkableOutputStream::createMark() +{ + MutexGuard guard( m_mutex ); + sal_Int32 nMark = m_nCurrentMark; + + m_mapMarks[nMark] = m_nCurrentPos; + + m_nCurrentMark ++; + return nMark; +} + +void OMarkableOutputStream::deleteMark(sal_Int32 Mark) +{ + MutexGuard guard( m_mutex ); + map<sal_Int32,sal_Int32,less<sal_Int32> >::iterator ii = m_mapMarks.find( Mark ); + + if( ii == m_mapMarks.end() ) { + throw IllegalArgumentException( + "MarkableOutputStream::deleteMark unknown mark (" + OUString::number(Mark) + ")", + *this, 0); + } + m_mapMarks.erase( ii ); + checkMarksAndFlush(); +} + +void OMarkableOutputStream::jumpToMark(sal_Int32 nMark) +{ + MutexGuard guard( m_mutex ); + map<sal_Int32,sal_Int32,less<sal_Int32> >::iterator ii = m_mapMarks.find( nMark ); + + if( ii == m_mapMarks.end() ) { + throw IllegalArgumentException( + "MarkableOutputStream::jumpToMark unknown mark (" + OUString::number(nMark) + ")", + *this, 0); + } + m_nCurrentPos = (*ii).second; +} + +void OMarkableOutputStream::jumpToFurthest() +{ + MutexGuard guard( m_mutex ); + m_nCurrentPos = m_pBuffer->getSize(); + checkMarksAndFlush(); +} + +sal_Int32 OMarkableOutputStream::offsetToMark(sal_Int32 nMark) +{ + + MutexGuard guard( m_mutex ); + map<sal_Int32,sal_Int32,less<sal_Int32> >::const_iterator ii = m_mapMarks.find( nMark ); + + if( ii == m_mapMarks.end() ) + { + throw IllegalArgumentException( + "MarkableOutputStream::offsetToMark unknown mark (" + OUString::number(nMark) + ")", + *this, 0); + } + return m_nCurrentPos - (*ii).second; +} + + +// XActiveDataSource2 +void OMarkableOutputStream::setOutputStream(const Reference < XOutputStream >& aStream) +{ + if( m_output != aStream ) { + m_output = aStream; + + Reference < XConnectable > succ( m_output , UNO_QUERY ); + setSuccessor( succ ); + } + m_bValidStream = m_output.is(); +} + +Reference< XOutputStream > OMarkableOutputStream::getOutputStream() +{ + return m_output; +} + + +void OMarkableOutputStream::setSuccessor( const Reference< XConnectable > &r ) +{ + /// if the references match, nothing needs to be done + if( m_succ != r ) { + /// store the reference for later use + m_succ = r; + + if( m_succ.is() ) { + m_succ->setPredecessor( Reference < XConnectable > ( + static_cast< XConnectable * >(this) ) ); + } + } +} +Reference <XConnectable > OMarkableOutputStream::getSuccessor() +{ + return m_succ; +} + + +// XDataSource +void OMarkableOutputStream::setPredecessor( const Reference< XConnectable > &r ) +{ + if( r != m_pred ) { + m_pred = r; + if( m_pred.is() ) { + m_pred->setSuccessor( Reference < XConnectable > ( + static_cast< XConnectable * >(this ) ) ); + } + } +} +Reference < XConnectable > OMarkableOutputStream::getPredecessor() +{ + return m_pred; +} + + +// private methods + +void OMarkableOutputStream::checkMarksAndFlush() +{ + // find the smallest mark + sal_Int32 nNextFound = m_nCurrentPos; + for (auto const& mark : m_mapMarks) + { + if( mark.second <= nNextFound ) { + nNextFound = mark.second; + } + } + + if( nNextFound ) { + // some data must be released ! + m_nCurrentPos -= nNextFound; + for (auto & mark : m_mapMarks) + { + mark.second -= nNextFound; + } + + Sequence<sal_Int8> seq(nNextFound); + m_pBuffer->readAt( 0 , seq , nNextFound ); + m_pBuffer->forgetFromStart( nNextFound ); + + // now write data through to streams + m_output->writeBytes( seq ); + } + else { + // nothing to do. There is a mark or the current cursor position, that prevents + // releasing data ! + } +} + + +// XServiceInfo +OUString OMarkableOutputStream::getImplementationName() +{ + return OMarkableOutputStream_getImplementationName(); +} + +// XServiceInfo +sal_Bool OMarkableOutputStream::supportsService(const OUString& ServiceName) +{ + return cppu::supportsService(this, ServiceName); +} + +// XServiceInfo +Sequence< OUString > OMarkableOutputStream::getSupportedServiceNames() +{ + return OMarkableOutputStream_getSupportedServiceNames(); +} + +/*------------------------ +* +* external binding +* +*------------------------*/ +Reference< XInterface > OMarkableOutputStream_CreateInstance( + SAL_UNUSED_PARAMETER const Reference < XComponentContext > & ) +{ + OMarkableOutputStream *p = new OMarkableOutputStream( ); + + return Reference < XInterface > ( static_cast<OWeakObject *>(p) ); +} + +OUString OMarkableOutputStream_getImplementationName() +{ + return "com.sun.star.comp.io.stm.MarkableOutputStream"; +} + +Sequence<OUString> OMarkableOutputStream_getSupportedServiceNames() +{ + Sequence<OUString> aRet { "com.sun.star.io.MarkableOutputStream" }; + + return aRet; +} + + +// XMarkableInputStream + +namespace { + +class OMarkableInputStream : + public WeakImplHelper + < + XInputStream, + XActiveDataSink, + XMarkableStream, + XConnectable, + XServiceInfo + > +{ +public: + OMarkableInputStream( ); + + +public: // XInputStream + virtual sal_Int32 SAL_CALL readBytes(Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead) override ; + virtual sal_Int32 SAL_CALL readSomeBytes(Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead) override; + virtual void SAL_CALL skipBytes(sal_Int32 nBytesToSkip) override; + + virtual sal_Int32 SAL_CALL available() override; + virtual void SAL_CALL closeInput() override; + +public: // XMarkable + virtual sal_Int32 SAL_CALL createMark() override; + virtual void SAL_CALL deleteMark(sal_Int32 Mark) override; + virtual void SAL_CALL jumpToMark(sal_Int32 nMark) override; + virtual void SAL_CALL jumpToFurthest() override; + virtual sal_Int32 SAL_CALL offsetToMark(sal_Int32 nMark) override; + +public: // XActiveDataSink + virtual void SAL_CALL setInputStream(const Reference < XInputStream > & aStream) override; + virtual Reference < XInputStream > SAL_CALL getInputStream() override; + +public: // XConnectable + virtual void SAL_CALL setPredecessor(const Reference < XConnectable > & aPredecessor) override; + virtual Reference < XConnectable > SAL_CALL getPredecessor() override; + virtual void SAL_CALL setSuccessor(const Reference < XConnectable > & aSuccessor) override; + virtual Reference < XConnectable > SAL_CALL getSuccessor() override; + +public: // XServiceInfo + OUString SAL_CALL getImplementationName() override; + Sequence< OUString > SAL_CALL getSupportedServiceNames() override; + sal_Bool SAL_CALL supportsService(const OUString& ServiceName) override; + +private: + void checkMarksAndFlush(); + + Reference < XConnectable > m_succ; + Reference < XConnectable > m_pred; + + Reference< XInputStream > m_input; + bool m_bValidStream; + + std::unique_ptr<MemRingBuffer> m_pBuffer; + map<sal_Int32,sal_Int32,less< sal_Int32 > > m_mapMarks; + sal_Int32 m_nCurrentPos; + sal_Int32 m_nCurrentMark; + + Mutex m_mutex; +}; + +} + +OMarkableInputStream::OMarkableInputStream() + : m_bValidStream(false) + , m_nCurrentPos(0) + , m_nCurrentMark(0) +{ + m_pBuffer.reset( new MemRingBuffer ); +} + + +// XInputStream + +sal_Int32 OMarkableInputStream::readBytes(Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead) +{ + sal_Int32 nBytesRead; + + if( !m_bValidStream ) { + throw NotConnectedException( + "MarkableInputStream::readBytes NotConnectedException", + *this ); + } + MutexGuard guard( m_mutex ); + if( m_mapMarks.empty() && ! m_pBuffer->getSize() ) { + // normal read ! + nBytesRead = m_input->readBytes( aData, nBytesToRead ); + } + else { + // read from buffer + sal_Int32 nRead; + + // read enough bytes into buffer + if( m_pBuffer->getSize() - m_nCurrentPos < nBytesToRead ) { + sal_Int32 nToRead = nBytesToRead - ( m_pBuffer->getSize() - m_nCurrentPos ); + nRead = m_input->readBytes( aData , nToRead ); + + OSL_ASSERT( aData.getLength() == nRead ); + + m_pBuffer->writeAt( m_pBuffer->getSize() , aData ); + + if( nRead < nToRead ) { + nBytesToRead = nBytesToRead - (nToRead-nRead); + } + } + + OSL_ASSERT( m_pBuffer->getSize() - m_nCurrentPos >= nBytesToRead ); + + m_pBuffer->readAt( m_nCurrentPos , aData , nBytesToRead ); + + m_nCurrentPos += nBytesToRead; + nBytesRead = nBytesToRead; + } + + return nBytesRead; +} + + +sal_Int32 OMarkableInputStream::readSomeBytes(Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead) +{ + + sal_Int32 nBytesRead; + if( !m_bValidStream ) { + throw NotConnectedException( + "MarkableInputStream::readSomeBytes NotConnectedException", + *this ); + } + + MutexGuard guard( m_mutex ); + if( m_mapMarks.empty() && ! m_pBuffer->getSize() ) { + // normal read ! + nBytesRead = m_input->readSomeBytes( aData, nMaxBytesToRead ); + } + else { + // read from buffer + sal_Int32 nRead = 0; + sal_Int32 nInBuffer = m_pBuffer->getSize() - m_nCurrentPos; + sal_Int32 nAdditionalBytesToRead = std::min<sal_Int32>(nMaxBytesToRead-nInBuffer,m_input->available()); + nAdditionalBytesToRead = std::max<sal_Int32>(0 , nAdditionalBytesToRead ); + + // read enough bytes into buffer + if( 0 == nInBuffer ) { + nRead = m_input->readSomeBytes( aData , nMaxBytesToRead ); + } + else if( nAdditionalBytesToRead ) { + nRead = m_input->readBytes( aData , nAdditionalBytesToRead ); + } + + if( nRead ) { + aData.realloc( nRead ); + m_pBuffer->writeAt( m_pBuffer->getSize() , aData ); + } + + nBytesRead = std::min( nMaxBytesToRead , nInBuffer + nRead ); + + // now take everything from buffer ! + m_pBuffer->readAt( m_nCurrentPos , aData , nBytesRead ); + + m_nCurrentPos += nBytesRead; + } + + return nBytesRead; + + +} + + +void OMarkableInputStream::skipBytes(sal_Int32 nBytesToSkip) +{ + if ( nBytesToSkip < 0 ) + throw BufferSizeExceededException( + "precondition not met: XInputStream::skipBytes: non-negative integer required!", + *this + ); + + // this method is blocking + Sequence<sal_Int8> seqDummy( nBytesToSkip ); + readBytes( seqDummy , nBytesToSkip ); +} + +sal_Int32 OMarkableInputStream::available() +{ + if( !m_bValidStream ) { + throw NotConnectedException( + "MarkableInputStream::available NotConnectedException", + *this ); + } + + MutexGuard guard( m_mutex ); + sal_Int32 nAvail = m_input->available() + ( m_pBuffer->getSize() - m_nCurrentPos ); + return nAvail; +} + + +void OMarkableInputStream::closeInput() +{ + if( !m_bValidStream ) { + throw NotConnectedException( + "MarkableInputStream::closeInput NotConnectedException", + *this ); + } + MutexGuard guard( m_mutex ); + + m_input->closeInput(); + + setInputStream( Reference< XInputStream > () ); + setPredecessor( Reference< XConnectable > () ); + setSuccessor( Reference< XConnectable >() ); + + m_pBuffer.reset(); + m_nCurrentPos = 0; + m_nCurrentMark = 0; +} + +// XMarkable + +sal_Int32 OMarkableInputStream::createMark() +{ + MutexGuard guard( m_mutex ); + sal_Int32 nMark = m_nCurrentMark; + + m_mapMarks[nMark] = m_nCurrentPos; + + m_nCurrentMark ++; + return nMark; +} + +void OMarkableInputStream::deleteMark(sal_Int32 Mark) +{ + MutexGuard guard( m_mutex ); + map<sal_Int32,sal_Int32,less<sal_Int32> >::iterator ii = m_mapMarks.find( Mark ); + + if( ii == m_mapMarks.end() ) { + throw IllegalArgumentException( + "MarkableInputStream::deleteMark unknown mark (" + OUString::number(Mark) + ")", + *this , 0 ); + } + m_mapMarks.erase( ii ); + checkMarksAndFlush(); +} + +void OMarkableInputStream::jumpToMark(sal_Int32 nMark) +{ + MutexGuard guard( m_mutex ); + map<sal_Int32,sal_Int32,less<sal_Int32> >::iterator ii = m_mapMarks.find( nMark ); + + if( ii == m_mapMarks.end() ) + { + throw IllegalArgumentException( + "MarkableInputStream::jumpToMark unknown mark (" + OUString::number(nMark) + ")", + *this , 0 ); + } + m_nCurrentPos = (*ii).second; +} + +void OMarkableInputStream::jumpToFurthest() +{ + MutexGuard guard( m_mutex ); + m_nCurrentPos = m_pBuffer->getSize(); + checkMarksAndFlush(); +} + +sal_Int32 OMarkableInputStream::offsetToMark(sal_Int32 nMark) +{ + MutexGuard guard( m_mutex ); + map<sal_Int32,sal_Int32,less<sal_Int32> >::const_iterator ii = m_mapMarks.find( nMark ); + + if( ii == m_mapMarks.end() ) + { + throw IllegalArgumentException( + "MarkableInputStream::offsetToMark unknown mark (" + OUString::number(nMark) + ")", + *this, 0 ); + } + return m_nCurrentPos - (*ii).second; +} + + +// XActiveDataSource +void OMarkableInputStream::setInputStream(const Reference< XInputStream > & aStream) +{ + + if( m_input != aStream ) { + m_input = aStream; + + Reference < XConnectable > pred( m_input , UNO_QUERY ); + setPredecessor( pred ); + } + + m_bValidStream = m_input.is(); + +} + +Reference< XInputStream > OMarkableInputStream::getInputStream() +{ + return m_input; +} + + +// XDataSink +void OMarkableInputStream::setSuccessor( const Reference< XConnectable > &r ) +{ + /// if the references match, nothing needs to be done + if( m_succ != r ) { + /// store the reference for later use + m_succ = r; + + if( m_succ.is() ) { + /// set this instance as the sink ! + m_succ->setPredecessor( Reference< XConnectable > ( + static_cast< XConnectable * >(this) ) ); + } + } +} + +Reference < XConnectable > OMarkableInputStream::getSuccessor() +{ + return m_succ; +} + + +// XDataSource +void OMarkableInputStream::setPredecessor( const Reference < XConnectable > &r ) +{ + if( r != m_pred ) { + m_pred = r; + if( m_pred.is() ) { + m_pred->setSuccessor( Reference< XConnectable > ( + static_cast< XConnectable * >(this) ) ); + } + } +} +Reference< XConnectable > OMarkableInputStream::getPredecessor() +{ + return m_pred; +} + + +void OMarkableInputStream::checkMarksAndFlush() +{ + // find the smallest mark + sal_Int32 nNextFound = m_nCurrentPos; + for (auto const& mark : m_mapMarks) + { + if( mark.second <= nNextFound ) { + nNextFound = mark.second; + } + } + + if( nNextFound ) { + // some data must be released ! + m_nCurrentPos -= nNextFound; + for (auto & mark : m_mapMarks) + { + mark.second -= nNextFound; + } + + m_pBuffer->forgetFromStart( nNextFound ); + + } + else { + // nothing to do. There is a mark or the current cursor position, that prevents + // releasing data ! + } +} + +// XServiceInfo +OUString OMarkableInputStream::getImplementationName() +{ + return OMarkableInputStream_getImplementationName(); +} + +// XServiceInfo +sal_Bool OMarkableInputStream::supportsService(const OUString& ServiceName) +{ + return cppu::supportsService(this, ServiceName); +} + +// XServiceInfo +Sequence< OUString > OMarkableInputStream::getSupportedServiceNames() +{ + return OMarkableInputStream_getSupportedServiceNames(); +} + +/*------------------------ +* +* external binding +* +*------------------------*/ +Reference < XInterface > OMarkableInputStream_CreateInstance( + SAL_UNUSED_PARAMETER const Reference < XComponentContext > & ) +{ + OMarkableInputStream *p = new OMarkableInputStream( ); + return Reference< XInterface > ( static_cast<OWeakObject *>(p) ); +} + +OUString OMarkableInputStream_getImplementationName() +{ + return "com.sun.star.comp.io.stm.MarkableInputStream"; +} + +Sequence<OUString> OMarkableInputStream_getSupportedServiceNames() +{ + Sequence<OUString> aRet { "com.sun.star.io.MarkableInputStream" }; + return aRet; +} + +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |