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/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: streamsection.cxx,v $
*
* $Revision: 1.6 $
*
* last change: $Author: obo $ $Date: 2006-09-17 17:21:36 $
*
* The Contents of this file are made available subject to
* the terms of GNU Lesser General Public License Version 2.1.
*
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2005 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library 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 for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
************************************************************************/
// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_comphelper.hxx"
#ifndef _COMPHELPER_STREAMSECTION_HXX_
#include <comphelper/streamsection.hxx>
#endif
#ifndef _OSL_DIAGNOSE_H_
#include <osl/diagnose.h>
#endif
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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