99 lines
3.9 KiB
C++
99 lines
3.9 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 <comphelper/streamsection.hxx>
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#include <osl/diagnose.h>
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namespace comphelper
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{
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//-------------------------------------------------------------------------
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OStreamSection::OStreamSection(const staruno::Reference< stario::XDataInputStream >& _rxInput)
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:m_xMarkStream(_rxInput, ::com::sun::star::uno::UNO_QUERY)
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,m_xInStream(_rxInput)
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,m_nBlockStart(-1)
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,m_nBlockLen(-1)
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{
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OSL_ENSURE(m_xInStream.is() && m_xMarkStream.is(), "OStreamSection::OStreamSection : invalid argument !");
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if (m_xInStream.is() && m_xMarkStream.is())
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{
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m_nBlockLen = _rxInput->readLong();
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m_nBlockStart = m_xMarkStream->createMark();
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}
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}
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//-------------------------------------------------------------------------
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OStreamSection::OStreamSection(const staruno::Reference< stario::XDataOutputStream >& _rxOutput, sal_Int32 _nPresumedLength)
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:m_xMarkStream(_rxOutput, ::com::sun::star::uno::UNO_QUERY)
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,m_xOutStream(_rxOutput)
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,m_nBlockStart(-1)
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,m_nBlockLen(-1)
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{
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OSL_ENSURE(m_xOutStream.is() && m_xMarkStream.is(), "OStreamSection::OStreamSection : invalid argument !");
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if (m_xOutStream.is() && m_xMarkStream.is())
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{
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m_nBlockStart = m_xMarkStream->createMark();
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// a placeholder where we will write the overall length (within the destructor)
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if (_nPresumedLength > 0)
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m_nBlockLen = _nPresumedLength + sizeof(m_nBlockLen);
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// as the caller did not consider - of course - the placeholder we are going to write
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else
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m_nBlockLen = 0;
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m_xOutStream->writeLong(m_nBlockLen);
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}
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}
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//-------------------------------------------------------------------------
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OStreamSection::~OStreamSection()
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{
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try
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{ // don't allow any exceptions to leave this block, this may be called during the stack unwinding of an exception
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// handling routing
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if (m_xInStream.is() && m_xMarkStream.is())
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{ // we're working on an input stream
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m_xMarkStream->jumpToMark(m_nBlockStart);
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m_xInStream->skipBytes(m_nBlockLen);
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m_xMarkStream->deleteMark(m_nBlockStart);
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}
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else if (m_xOutStream.is() && m_xMarkStream.is())
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{
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sal_Int32 nRealBlockLength = m_xMarkStream->offsetToMark(m_nBlockStart) - sizeof(m_nBlockLen);
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if (m_nBlockLen && (m_nBlockLen == nRealBlockLength))
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// nothing to do : the estimation the caller gave us (in the ctor) was correct
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m_xMarkStream->deleteMark(m_nBlockStart);
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else
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{ // the estimation was wrong (or we didn't get one)
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m_nBlockLen = nRealBlockLength;
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m_xMarkStream->jumpToMark(m_nBlockStart);
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m_xOutStream->writeLong(m_nBlockLen);
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m_xMarkStream->jumpToFurthest();
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m_xMarkStream->deleteMark(m_nBlockStart);
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}
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}
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}
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catch(const staruno::Exception&)
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{
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}
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}
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// -----------------------------------------------------------------------------
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} // namespace comphelper
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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