forked from amazingfate/loongoffice
710f41b7ae
Change-Id: I6a92196f33d7a5278c7dcc426112e9c56d582655 Reviewed-on: https://gerrit.libreoffice.org/4627 Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com> Tested-by: Norbert Thiebaud <nthiebaud@gmail.com>
126 lines
3.5 KiB
C++
126 lines
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#include <rtl/ustring.hxx>
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#include <tools/stream.hxx>
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#include <tools/cachestr.hxx>
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#include <tools/tempfile.hxx>
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SvCacheStream::SvCacheStream( sal_uIntPtr nMaxMemSize )
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{
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if( !nMaxMemSize )
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nMaxMemSize = 20480;
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SvStream::bIsWritable = true;
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nMaxSize = nMaxMemSize;
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bPersistent = false;
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pSwapStream = 0;
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pCurrentStream = new SvMemoryStream( nMaxMemSize );
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pTempFile = 0;
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}
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SvCacheStream::~SvCacheStream()
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{
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if( pCurrentStream != pSwapStream )
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delete pSwapStream;
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delete pCurrentStream;
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if( pSwapStream && !bPersistent && pTempFile )
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{
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// temporaeres File loeschen
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pTempFile->EnableKillingFile( true );
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}
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delete pTempFile;
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}
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void SvCacheStream::SwapOut()
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{
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if( pCurrentStream != pSwapStream )
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{
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if( !pSwapStream && aFileName.isEmpty() )
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{
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pTempFile = new TempFile;
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aFileName = pTempFile->GetName();
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}
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sal_uIntPtr nPos = pCurrentStream->Tell();
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pCurrentStream->Seek( 0 );
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if( !pSwapStream )
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pSwapStream = new SvFileStream( aFileName, STREAM_READWRITE | STREAM_TRUNC );
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*pSwapStream << *pCurrentStream;
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pSwapStream->Flush();
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delete pCurrentStream;
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pCurrentStream = pSwapStream;
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pCurrentStream->Seek( nPos );
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}
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}
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sal_uIntPtr SvCacheStream::GetData( void* pData, sal_uIntPtr nSize )
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{
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return pCurrentStream->Read( pData, nSize );
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}
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sal_uIntPtr SvCacheStream::PutData( const void* pData, sal_uIntPtr nSize )
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{
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// prefer swapping data instead copying it again
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if( pCurrentStream != pSwapStream
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&& pCurrentStream->Tell() + nSize > nMaxSize )
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SwapOut();
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return pCurrentStream->Write( pData, nSize );
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}
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sal_uIntPtr SvCacheStream::SeekPos( sal_uIntPtr nPos )
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{
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return pCurrentStream->Seek( nPos );
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}
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void SvCacheStream::FlushData()
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{
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pCurrentStream->Flush();
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if( pCurrentStream != pSwapStream
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&& ((SvMemoryStream*)pCurrentStream)->GetSize() > nMaxSize )
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SwapOut();
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}
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const void* SvCacheStream::GetBuffer()
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{
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Flush();
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if( pCurrentStream != pSwapStream )
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return ((SvMemoryStream*)pCurrentStream)->GetData();
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else
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return 0;
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}
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void SvCacheStream::SetSize( sal_uIntPtr nSize )
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{
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pCurrentStream->SetStreamSize( nSize );
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}
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sal_uIntPtr SvCacheStream::GetSize()
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{
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// CAUTION: SvMemoryStream::GetSize() returns size of the allocated buffer
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Flush();
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sal_uIntPtr nTemp = Tell();
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sal_uIntPtr nLength = Seek( STREAM_SEEK_TO_END );
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Seek( nTemp );
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return nLength;
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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