1 files changed, 409 insertions, 0 deletions
diff --git a/package/source/xstor/switchpersistencestream.cxx b/package/source/xstor/switchpersistencestream.cxx
new file mode 100644
index 000000000..ff9828a72
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+++ b/package/source/xstor/switchpersistencestream.cxx
@@ -0,0 +1,409 @@
+/* -*- 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 <osl/diagnose.h>
+#include <com/sun/star/io/IOException.hpp>
+#include <com/sun/star/io/NotConnectedException.hpp>
+#include <com/sun/star/io/TempFile.hpp>
+#include <comphelper/storagehelper.hxx>
+#include "switchpersistencestream.hxx"
+
+using namespace ::com::sun::star;
+
+struct SPStreamData_Impl
+{
+    bool m_bInStreamBased;
+
+    // the streams below are not visible from outside so there is no need to remember position
+
+    // original stream related members
+    uno::Reference< io::XTruncate > m_xOrigTruncate;
+    uno::Reference< io::XSeekable > m_xOrigSeekable;
+    uno::Reference< io::XInputStream > m_xOrigInStream;
+    uno::Reference< io::XOutputStream > m_xOrigOutStream;
+
+    bool m_bInOpen;
+    bool m_bOutOpen;
+
+    SPStreamData_Impl(
+            bool bInStreamBased,
+            const uno::Reference< io::XTruncate >& xOrigTruncate,
+            const uno::Reference< io::XSeekable >& xOrigSeekable,
+            const uno::Reference< io::XInputStream >& xOrigInStream,
+            const uno::Reference< io::XOutputStream >& xOrigOutStream,
+            bool bInOpen,
+            bool bOutOpen )
+    : m_bInStreamBased( bInStreamBased )
+    , m_xOrigTruncate( xOrigTruncate )
+    , m_xOrigSeekable( xOrigSeekable )
+    , m_xOrigInStream( xOrigInStream )
+    , m_xOrigOutStream( xOrigOutStream )
+    , m_bInOpen( bInOpen )
+    , m_bOutOpen( bOutOpen )
+    {
+    }
+};
+
+SwitchablePersistenceStream::SwitchablePersistenceStream(
+        const uno::Reference< uno::XComponentContext >& xContext,
+        const uno::Reference< io::XStream >& xStream )
+: m_xContext( xContext )
+{
+    SwitchPersistenceTo( xStream );
+}
+
+SwitchablePersistenceStream::SwitchablePersistenceStream(
+        const uno::Reference< uno::XComponentContext >& xContext,
+        const uno::Reference< io::XInputStream >& xInputStream )
+: m_xContext( xContext )
+{
+    SwitchPersistenceTo( xInputStream );
+}
+
+SwitchablePersistenceStream::~SwitchablePersistenceStream()
+{
+    CloseAll_Impl();
+}
+
+void SwitchablePersistenceStream::SwitchPersistenceTo( const uno::Reference< io::XStream >& xStream )
+{
+    uno::Reference< io::XTruncate > xNewTruncate( xStream, uno::UNO_QUERY_THROW );
+    uno::Reference< io::XSeekable > xNewSeekable( xStream, uno::UNO_QUERY_THROW );
+    uno::Reference< io::XInputStream > xNewInStream = xStream->getInputStream();
+    uno::Reference< io::XOutputStream > xNewOutStream = xStream->getOutputStream();
+    if ( !xNewInStream.is() || !xNewOutStream.is() )
+        throw uno::RuntimeException();
+
+    sal_Int64 nPos = 0;
+    bool bInOpen = false;
+    bool bOutOpen = false;
+
+    if ( m_pStreamData && m_pStreamData->m_xOrigSeekable.is() )
+    {
+        // check that the length is the same
+        if ( m_pStreamData->m_xOrigSeekable->getLength() != xNewSeekable->getLength() )
+            throw uno::RuntimeException();
+
+        // get the current position
+        nPos = m_pStreamData->m_xOrigSeekable->getPosition();
+        bInOpen = m_pStreamData->m_bInOpen;
+        bOutOpen = m_pStreamData->m_bOutOpen;
+    }
+
+    xNewSeekable->seek( nPos );
+
+    CloseAll_Impl();
+
+    m_pStreamData.reset( new SPStreamData_Impl( false,
+                                            xNewTruncate, xNewSeekable, xNewInStream, xNewOutStream,
+                                            bInOpen, bOutOpen ) );
+}
+
+void SwitchablePersistenceStream::SwitchPersistenceTo( const uno::Reference< io::XInputStream >& xInputStream )
+{
+    uno::Reference< io::XTruncate > xNewTruncate;
+    uno::Reference< io::XSeekable > xNewSeekable( xInputStream, uno::UNO_QUERY_THROW );
+    uno::Reference< io::XOutputStream > xNewOutStream;
+    if ( !xInputStream.is() )
+        throw uno::RuntimeException();
+
+    sal_Int64 nPos = 0;
+    bool bInOpen = false;
+    bool bOutOpen = false;
+
+    if ( m_pStreamData && m_pStreamData->m_xOrigSeekable.is() )
+    {
+        // check that the length is the same
+        if ( m_pStreamData->m_xOrigSeekable->getLength() != xNewSeekable->getLength() )
+            throw uno::RuntimeException();
+
+        // get the current position
+        nPos = m_pStreamData->m_xOrigSeekable->getPosition();
+        bInOpen = m_pStreamData->m_bInOpen;
+        bOutOpen = m_pStreamData->m_bOutOpen;
+    }
+
+    xNewSeekable->seek( nPos );
+
+    CloseAll_Impl();
+
+    m_pStreamData.reset( new SPStreamData_Impl( true,
+                                            xNewTruncate, xNewSeekable, xInputStream, xNewOutStream,
+                                            bInOpen, bOutOpen ) );
+
+}
+
+void SwitchablePersistenceStream::CopyAndSwitchPersistenceTo( const uno::Reference< io::XStream >& xStream )
+{
+    uno::Reference< io::XStream > xTargetStream = xStream;
+    uno::Reference< io::XSeekable > xTargetSeek;
+
+    if ( !xTargetStream.is() )
+    {
+        xTargetStream.set( io::TempFile::create(m_xContext), uno::UNO_QUERY_THROW );
+        xTargetSeek.set( xTargetStream, uno::UNO_QUERY_THROW );
+    }
+    else
+    {
+        // the provided stream must be empty
+        xTargetSeek.set( xTargetStream, uno::UNO_QUERY_THROW );
+        if ( xTargetSeek->getLength() )
+            throw io::IOException("provided stream not empty");
+    }
+
+    uno::Reference< io::XTruncate > xTargetTruncate( xTargetStream, uno::UNO_QUERY_THROW );
+    uno::Reference< io::XInputStream > xTargetInStream = xTargetStream->getInputStream();
+    uno::Reference< io::XOutputStream > xTargetOutStream = xTargetStream->getOutputStream();
+    if ( !xTargetInStream.is() || !xTargetOutStream.is() )
+        throw uno::RuntimeException();
+
+    if ( !m_pStreamData->m_xOrigInStream.is() || !m_pStreamData->m_xOrigSeekable.is() )
+        throw uno::RuntimeException();
+
+    sal_Int64 nPos = m_pStreamData->m_xOrigSeekable->getPosition();
+    m_pStreamData->m_xOrigSeekable->seek( 0 );
+    ::comphelper::OStorageHelper::CopyInputToOutput( m_pStreamData->m_xOrigInStream, xTargetOutStream );
+    xTargetOutStream->flush();
+    xTargetSeek->seek( nPos );
+
+    bool bInOpen = m_pStreamData->m_bInOpen;
+    bool bOutOpen = m_pStreamData->m_bOutOpen;
+
+    CloseAll_Impl();
+
+    m_pStreamData.reset( new SPStreamData_Impl( false,
+                                        xTargetTruncate, xTargetSeek, xTargetInStream, xTargetOutStream,
+                                        bInOpen, bOutOpen ) );
+}
+
+void SwitchablePersistenceStream::CloseAll_Impl()
+{
+    m_pStreamData.reset();
+}
+
+// css::io::XStream
+uno::Reference< io::XInputStream > SAL_CALL SwitchablePersistenceStream::getInputStream(  )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( m_pStreamData )
+        m_pStreamData->m_bInOpen = true;
+    return static_cast< io::XInputStream* >( this );
+}
+
+uno::Reference< io::XOutputStream > SAL_CALL SwitchablePersistenceStream::getOutputStream(  )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( m_pStreamData )
+        m_pStreamData->m_bOutOpen = true;
+    return static_cast< io::XOutputStream* >( this );
+}
+
+// css::io::XInputStream
+::sal_Int32 SAL_CALL SwitchablePersistenceStream::readBytes( uno::Sequence< ::sal_Int8 >& aData, ::sal_Int32 nBytesToRead )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_pStreamData )
+        throw io::NotConnectedException();
+
+    // the original stream data should be provided
+    if ( !m_pStreamData->m_xOrigInStream.is() )
+        throw uno::RuntimeException();
+
+    return m_pStreamData->m_xOrigInStream->readBytes( aData, nBytesToRead );
+}
+
+::sal_Int32 SAL_CALL SwitchablePersistenceStream::readSomeBytes( uno::Sequence< ::sal_Int8 >& aData, ::sal_Int32 nMaxBytesToRead )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_pStreamData )
+        throw io::NotConnectedException();
+
+    // the original stream data should be provided
+    if ( !m_pStreamData->m_xOrigInStream.is() )
+        throw uno::RuntimeException();
+
+    return m_pStreamData->m_xOrigInStream->readBytes( aData, nMaxBytesToRead );
+}
+
+void SAL_CALL SwitchablePersistenceStream::skipBytes( ::sal_Int32 nBytesToSkip )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_pStreamData )
+        throw io::NotConnectedException();
+
+    // the original stream data should be provided
+    if ( !m_pStreamData->m_xOrigInStream.is() )
+        throw uno::RuntimeException();
+
+    m_pStreamData->m_xOrigInStream->skipBytes( nBytesToSkip );
+}
+
+::sal_Int32 SAL_CALL SwitchablePersistenceStream::available(  )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_pStreamData )
+        throw io::NotConnectedException();
+
+    // the original stream data should be provided
+    if ( !m_pStreamData->m_xOrigInStream.is() )
+        throw uno::RuntimeException();
+
+    return m_pStreamData->m_xOrigInStream->available();
+}
+
+void SAL_CALL SwitchablePersistenceStream::closeInput()
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_pStreamData )
+        throw io::NotConnectedException();
+
+    m_pStreamData->m_bInOpen = false;
+    if ( !m_pStreamData->m_bOutOpen )
+        CloseAll_Impl();
+}
+
+// css::io::XOutputStream
+void SAL_CALL SwitchablePersistenceStream::writeBytes( const uno::Sequence< ::sal_Int8 >& aData )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_pStreamData )
+        throw io::NotConnectedException();
+
+    if ( m_pStreamData->m_bInStreamBased )
+        throw io::IOException();
+
+    // the original stream data should be provided
+    if ( !m_pStreamData->m_xOrigOutStream.is() )
+        throw uno::RuntimeException();
+
+    m_pStreamData->m_xOrigOutStream->writeBytes( aData );
+}
+
+void SAL_CALL SwitchablePersistenceStream::flush(  )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_pStreamData || m_pStreamData->m_bInStreamBased )
+    {
+        OSL_FAIL( "flush() is not acceptable!" );
+        return;
+        // in future throw exception, for now some code might call flush() on closed stream
+        // since file ucp implementation allows it
+        // throw io::NotConnectedException();
+    }
+
+    // the original stream data should be provided
+    if ( !m_pStreamData->m_xOrigOutStream.is() )
+        throw uno::RuntimeException();
+
+    m_pStreamData->m_xOrigOutStream->flush();
+}
+
+void SAL_CALL SwitchablePersistenceStream::closeOutput(  )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_pStreamData )
+        throw io::NotConnectedException();
+
+    m_pStreamData->m_bOutOpen = false;
+    if ( !m_pStreamData->m_bInOpen )
+        CloseAll_Impl();
+}
+
+// css::io::XTruncate
+void SAL_CALL SwitchablePersistenceStream::truncate(  )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_pStreamData )
+        throw io::NotConnectedException();
+
+    if ( m_pStreamData->m_bInStreamBased )
+        throw io::IOException();
+
+    // the original stream data should be provided
+    if ( !m_pStreamData->m_xOrigTruncate.is() )
+        throw uno::RuntimeException();
+
+    m_pStreamData->m_xOrigTruncate->truncate();
+}
+
+// css::io::XSeekable
+void SAL_CALL SwitchablePersistenceStream::seek( ::sal_Int64 location )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_pStreamData )
+        throw io::NotConnectedException();
+
+    // the original stream data should be provided
+    if ( !m_pStreamData->m_xOrigSeekable.is() )
+        throw uno::RuntimeException();
+
+    m_pStreamData->m_xOrigSeekable->seek( location );
+}
+
+::sal_Int64 SAL_CALL SwitchablePersistenceStream::getPosition(  )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_pStreamData )
+        throw io::NotConnectedException();
+
+    // the original stream data should be provided
+    if ( !m_pStreamData->m_xOrigSeekable.is() )
+        throw uno::RuntimeException();
+
+    return m_pStreamData->m_xOrigSeekable->getPosition();
+}
+
+::sal_Int64 SAL_CALL SwitchablePersistenceStream::getLength(  )
+{
+    std::scoped_lock aGuard( m_aMutex );
+
+    if ( !m_pStreamData )
+        throw io::NotConnectedException();
+
+    // the original stream data should be provided
+    if ( !m_pStreamData->m_xOrigSeekable.is() )
+        throw uno::RuntimeException();
+
+    return m_pStreamData->m_xOrigSeekable->getLength();
+}
+
+void SAL_CALL SwitchablePersistenceStream::waitForCompletion()
+{
+    if ( !m_pStreamData )
+        throw io::NotConnectedException();
+
+    uno::Reference< io::XAsyncOutputMonitor > asyncOutputMonitor( m_pStreamData->m_xOrigOutStream, uno::UNO_QUERY );
+    if ( asyncOutputMonitor.is() )
+        asyncOutputMonitor->waitForCompletion();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */