Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : 
      20             : #include <comphelper/streamsection.hxx>
      21             : #include <osl/diagnose.h>
      22             : 
      23             : namespace comphelper
      24             : {
      25             : 
      26             : 
      27          10 : OStreamSection::OStreamSection(const css::uno::Reference< css::io::XDataInputStream >& _rxInput)
      28             :     :m_xMarkStream(_rxInput, ::com::sun::star::uno::UNO_QUERY)
      29             :     ,m_xInStream(_rxInput)
      30             :     ,m_nBlockStart(-1)
      31          10 :     ,m_nBlockLen(-1)
      32             : {
      33             :     OSL_ENSURE(m_xInStream.is() && m_xMarkStream.is(), "OStreamSection::OStreamSection : invalid argument !");
      34          10 :     if (m_xInStream.is() && m_xMarkStream.is())
      35             :     {
      36          10 :         m_nBlockLen = _rxInput->readLong();
      37          10 :         m_nBlockStart = m_xMarkStream->createMark();
      38             :     }
      39          10 : }
      40             : 
      41             : 
      42          10 : OStreamSection::OStreamSection(const css::uno::Reference< css::io::XDataOutputStream >& _rxOutput, sal_Int32 _nPresumedLength)
      43             :     :m_xMarkStream(_rxOutput, ::com::sun::star::uno::UNO_QUERY)
      44             :     ,m_xOutStream(_rxOutput)
      45             :     ,m_nBlockStart(-1)
      46          10 :     ,m_nBlockLen(-1)
      47             : {
      48             :     OSL_ENSURE(m_xOutStream.is() && m_xMarkStream.is(), "OStreamSection::OStreamSection : invalid argument !");
      49          10 :     if (m_xOutStream.is() && m_xMarkStream.is())
      50             :     {
      51          10 :         m_nBlockStart = m_xMarkStream->createMark();
      52             :         // a placeholder where we will write the overall length (within the destructor)
      53          10 :         if (_nPresumedLength > 0)
      54           0 :             m_nBlockLen = _nPresumedLength + sizeof(m_nBlockLen);
      55             :             // as the caller did not consider - of course - the placeholder we are going to write
      56             :         else
      57          10 :             m_nBlockLen = 0;
      58          10 :         m_xOutStream->writeLong(m_nBlockLen);
      59             :     }
      60          10 : }
      61             : 
      62             : 
      63          40 : OStreamSection::~OStreamSection()
      64             : {
      65             :     try
      66             :     {   // don't allow any exceptions to leave this block, this may be called during the stack unwinding of an exception
      67             :         // handling routing
      68          20 :         if (m_xInStream.is() &&  m_xMarkStream.is())
      69             :         {   // we're working on an input stream
      70          10 :             m_xMarkStream->jumpToMark(m_nBlockStart);
      71          10 :             m_xInStream->skipBytes(m_nBlockLen);
      72          10 :             m_xMarkStream->deleteMark(m_nBlockStart);
      73             :         }
      74          10 :         else if (m_xOutStream.is() && m_xMarkStream.is())
      75             :         {
      76          10 :             sal_Int32 nRealBlockLength = m_xMarkStream->offsetToMark(m_nBlockStart) - sizeof(m_nBlockLen);
      77          10 :             if (m_nBlockLen && (m_nBlockLen == nRealBlockLength))
      78             :                 // nothing to do : the estimation the caller gave us (in the ctor) was correct
      79           0 :                 m_xMarkStream->deleteMark(m_nBlockStart);
      80             :             else
      81             :             {   // the estimation was wrong (or we didn't get one)
      82          10 :                 m_nBlockLen = nRealBlockLength;
      83          10 :                 m_xMarkStream->jumpToMark(m_nBlockStart);
      84          10 :                 m_xOutStream->writeLong(m_nBlockLen);
      85          10 :                 m_xMarkStream->jumpToFurthest();
      86          10 :                 m_xMarkStream->deleteMark(m_nBlockStart);
      87             :             }
      88             :         }
      89             :     }
      90           0 :     catch(const css::uno::Exception&)
      91             :     {
      92             :     }
      93          20 : }
      94             : 
      95             : 
      96             : }   // namespace comphelper
      97             : 
      98             : 
      99             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */