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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_comphelper.hxx"
#include <comphelper/streamsection.hxx>
#include <osl/diagnose.h>
namespace comphelper
{
//-------------------------------------------------------------------------
OStreamSection::OStreamSection(const staruno::Reference< stario::XDataInputStream >& _rxInput)
:m_xMarkStream(_rxInput, ::com::sun::star::uno::UNO_QUERY)
,m_xInStream(_rxInput)
,m_nBlockStart(-1)
,m_nBlockLen(-1)
{
OSL_ENSURE(m_xInStream.is() && m_xMarkStream.is(), "OStreamSection::OStreamSection : invalid argument !");
if (m_xInStream.is() && m_xMarkStream.is())
{
m_nBlockLen = _rxInput->readLong();
m_nBlockStart = m_xMarkStream->createMark();
}
}
//-------------------------------------------------------------------------
OStreamSection::OStreamSection(const staruno::Reference< stario::XDataOutputStream >& _rxOutput, sal_Int32 _nPresumedLength)
:m_xMarkStream(_rxOutput, ::com::sun::star::uno::UNO_QUERY)
,m_xOutStream(_rxOutput)
,m_nBlockStart(-1)
,m_nBlockLen(-1)
{
OSL_ENSURE(m_xOutStream.is() && m_xMarkStream.is(), "OStreamSection::OStreamSection : invalid argument !");
if (m_xOutStream.is() && m_xMarkStream.is())
{
m_nBlockStart = m_xMarkStream->createMark();
// a placeholder where we will write the overall length (within the destructor)
if (_nPresumedLength > 0)
m_nBlockLen = _nPresumedLength + sizeof(m_nBlockLen);
// as the caller did not consider - of course - the placeholder we are going to write
else
m_nBlockLen = 0;
m_xOutStream->writeLong(m_nBlockLen);
}
}
//-------------------------------------------------------------------------
OStreamSection::~OStreamSection()
{
try
{ // don't allow any exceptions to leave this block, this may be called during the stack unwinding of an exception
// handling routing
if (m_xInStream.is() && m_xMarkStream.is())
{ // we're working on an input stream
m_xMarkStream->jumpToMark(m_nBlockStart);
m_xInStream->skipBytes(m_nBlockLen);
m_xMarkStream->deleteMark(m_nBlockStart);
}
else if (m_xOutStream.is() && m_xMarkStream.is())
{
sal_Int32 nRealBlockLength = m_xMarkStream->offsetToMark(m_nBlockStart) - sizeof(m_nBlockLen);
if (m_nBlockLen && (m_nBlockLen == nRealBlockLength))
// nothing to do : the estimation the caller gave us (in the ctor) was correct
m_xMarkStream->deleteMark(m_nBlockStart);
else
{ // the estimation was wrong (or we didn't get one)
m_nBlockLen = nRealBlockLength;
m_xMarkStream->jumpToMark(m_nBlockStart);
m_xOutStream->writeLong(m_nBlockLen);
m_xMarkStream->jumpToFurthest();
m_xMarkStream->deleteMark(m_nBlockStart);
}
}
}
catch(const staruno::Exception&)
{
}
}
// -----------------------------------------------------------------------------
sal_Int32 OStreamSection::available()
{
sal_Int32 nBytes = 0;
try
{ // don't allow any exceptions to leave this block, this may be called during the stack unwinding of an exception
if (m_xInStream.is() && m_xMarkStream.is())
nBytes = m_xMarkStream->offsetToMark(m_nBlockStart) - sizeof(m_nBlockLen);
}
catch(const staruno::Exception&)
{
}
return nBytes;
}
// -----------------------------------------------------------------------------
} // namespace comphelper
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