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/* -*- 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 <tools/stream.hxx>
#include <tools/cachestr.hxx>
#include <tools/tempfile.hxx>
SvCacheStream::SvCacheStream( sal_uIntPtr nMaxMemSize )
{
if( !nMaxMemSize )
nMaxMemSize = 20480;
SvStream::bIsWritable = sal_True;
nMaxSize = nMaxMemSize;
bPersistent = sal_False;
pSwapStream = 0;
pCurrentStream = new SvMemoryStream( nMaxMemSize );
pTempFile = 0;
}
SvCacheStream::~SvCacheStream()
{
if( pCurrentStream != pSwapStream )
delete pSwapStream;
delete pCurrentStream;
if( pSwapStream && !bPersistent && pTempFile )
{
// temporaeres File loeschen
pTempFile->EnableKillingFile( sal_True );
}
delete pTempFile;
}
void SvCacheStream::SwapOut()
{
if( pCurrentStream != pSwapStream )
{
if( !pSwapStream && !aFileName.Len() )
{
pTempFile = new TempFile;
aFileName = pTempFile->GetName();
}
sal_uIntPtr nPos = pCurrentStream->Tell();
pCurrentStream->Seek( 0 );
if( !pSwapStream )
pSwapStream = new SvFileStream( aFileName, STREAM_READWRITE | STREAM_TRUNC );
*pSwapStream << *pCurrentStream;
pSwapStream->Flush();
delete pCurrentStream;
pCurrentStream = pSwapStream;
pCurrentStream->Seek( nPos );
}
}
sal_uIntPtr SvCacheStream::GetData( void* pData, sal_uIntPtr nSize )
{
return pCurrentStream->Read( pData, nSize );
}
sal_uIntPtr SvCacheStream::PutData( const void* pData, sal_uIntPtr nSize )
{
// prefer swapping data instead copying it again
if( pCurrentStream != pSwapStream
&& pCurrentStream->Tell() + nSize > nMaxSize )
SwapOut();
return pCurrentStream->Write( pData, nSize );
}
sal_uIntPtr SvCacheStream::SeekPos( sal_uIntPtr nPos )
{
return pCurrentStream->Seek( nPos );
}
void SvCacheStream::FlushData()
{
pCurrentStream->Flush();
if( pCurrentStream != pSwapStream
&& ((SvMemoryStream*)pCurrentStream)->GetSize() > nMaxSize )
SwapOut();
}
const void* SvCacheStream::GetBuffer()
{
Flush();
if( pCurrentStream != pSwapStream )
return ((SvMemoryStream*)pCurrentStream)->GetData();
else
return 0;
}
void SvCacheStream::SetSize( sal_uIntPtr nSize )
{
pCurrentStream->SetStreamSize( nSize );
}
sal_uIntPtr SvCacheStream::GetSize()
{
// CAUTION: SvMemoryStream::GetSize() returns size of the allocated buffer
Flush();
sal_uIntPtr nTemp = Tell();
sal_uIntPtr nLength = Seek( STREAM_SEEK_TO_END );
Seek( nTemp );
return nLength;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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