122 lines
3.5 KiB
C++
122 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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#ifndef INCLUDED_SAX_SOURCE_TOOLS_CACHEDOUTPUTSTREAM_HXX
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#define INCLUDED_SAX_SOURCE_TOOLS_CACHEDOUTPUTSTREAM_HXX
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#include <sal/types.h>
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#include <com/sun/star/io/XOutputStream.hpp>
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#include <com/sun/star/uno/Sequence.hxx>
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#include <cstring>
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#include <cstdlib>
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#include <boost/shared_ptr.hpp>
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namespace sax_fastparser {
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class ForMergeBase
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{
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public:
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virtual ~ForMergeBase() {}
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virtual void append( const css::uno::Sequence<sal_Int8>& rWhat ) = 0;
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};
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class CachedOutputStream
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{
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/// When buffer hits this size, it's written to mxOutputStream
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static const sal_Int32 mnMaximumSize = 0x10000;
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/// Output stream, usually writing data into files.
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css::uno::Reference< css::io::XOutputStream > mxOutputStream;
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sal_Int32 mnCacheWrittenSize;
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const css::uno::Sequence<sal_Int8> mpCache;
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uno_Sequence *pSeq;
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bool mbWriteToOutStream;
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/// ForMerge structure is used for sorting elements in Writer
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boost::shared_ptr< ForMergeBase > mpForMerge;
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public:
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CachedOutputStream() : mnCacheWrittenSize(0)
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, mpCache(mnMaximumSize)
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, pSeq(mpCache.get())
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, mbWriteToOutStream(true)
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, mpForMerge(nullptr)
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{}
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~CachedOutputStream() {}
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css::uno::Reference< css::io::XOutputStream > getOutputStream() const
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{
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return mxOutputStream;
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}
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void setOutputStream( const css::uno::Reference< css::io::XOutputStream >& xOutputStream )
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{
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mxOutputStream = xOutputStream;
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}
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void setOutput( boost::shared_ptr< ForMergeBase > pForMerge )
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{
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flush();
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mbWriteToOutStream = false;
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mpForMerge = pForMerge;
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}
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void resetOutputToStream()
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{
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flush();
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mbWriteToOutStream = true;
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mpForMerge.reset();
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}
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/// cache string and if limit is hit, flush
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void writeBytes( const sal_Int8* pStr, sal_Int32 nLen )
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{
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// Write when the buffer gets big enough
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if (mnCacheWrittenSize + nLen > mnMaximumSize)
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{
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flush();
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// Writer does some elements sorting, so it can accumulate
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// pretty big strings in FastSaxSerializer::ForMerge.
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// In that case, just flush data and write immediately.
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if (nLen > mnMaximumSize)
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{
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if (mbWriteToOutStream)
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mxOutputStream->writeBytes( css::uno::Sequence<sal_Int8>(pStr, nLen) );
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else
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mpForMerge->append( css::uno::Sequence<sal_Int8>(pStr, nLen) );
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return;
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}
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}
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memcpy(pSeq->elements + mnCacheWrittenSize, pStr, nLen);
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mnCacheWrittenSize += nLen;
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}
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/// immediately write buffer into mxOutputStream and clear
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void flush()
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{
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// resize the Sequence to written size
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pSeq->nElements = mnCacheWrittenSize;
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if (mbWriteToOutStream)
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mxOutputStream->writeBytes( mpCache );
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else
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mpForMerge->append( mpCache );
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// and next time write to the beginning
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mnCacheWrittenSize = 0;
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}
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};
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}
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#endif
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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