comphelper/source/streaming/streamsection.cxx

   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 OStreamSection::OStreamSection(const css::uno::Reference< css::io::XDataInputStream >& _rxInput)
  28     :m_xMarkStream(_rxInput, css::uno::UNO_QUERY)
  29     ,m_xInStream(_rxInput)
  30     ,m_nBlockStart(-1)
  31     ,m_nBlockLen(-1)
  32 {
  33     OSL_ENSURE(m_xInStream.is() && m_xMarkStream.is(), "OStreamSection::OStreamSection : invalid argument !");
  34     if (m_xInStream.is() && m_xMarkStream.is())
  35     {
  36         m_nBlockLen = _rxInput->readLong();
  37         m_nBlockStart = m_xMarkStream->createMark();
  38     }
  39 }
  40
  41
  42 OStreamSection::OStreamSection(const css::uno::Reference< css::io::XDataOutputStream >& _rxOutput)
  43     :m_xMarkStream(_rxOutput, css::uno::UNO_QUERY)
  44     ,m_xOutStream(_rxOutput)
  45     ,m_nBlockStart(-1)
  46     ,m_nBlockLen(-1)
  47 {
  48     OSL_ENSURE(m_xOutStream.is() && m_xMarkStream.is(), "OStreamSection::OStreamSection : invalid argument !");
  49     if (m_xOutStream.is() && m_xMarkStream.is())
  50     {
  51         m_nBlockStart = m_xMarkStream->createMark();
  52         m_nBlockLen = 0;
  53         m_xOutStream->writeLong(m_nBlockLen);
  54     }
  55 }
  56
  57
  58 OStreamSection::~OStreamSection()
  59 {
  60     try
  61     {   // don't allow any exceptions to leave this block, this may be called during the stack unwinding of an exception
  62         // handling routing
  63         if (m_xInStream.is() &&  m_xMarkStream.is())
  64         {   // we're working on an input stream
  65             m_xMarkStream->jumpToMark(m_nBlockStart);
  66             m_xInStream->skipBytes(m_nBlockLen);
  67             m_xMarkStream->deleteMark(m_nBlockStart);
  68         }
  69         else if (m_xOutStream.is() && m_xMarkStream.is())
  70         {
  71             sal_Int32 nRealBlockLength = m_xMarkStream->offsetToMark(m_nBlockStart) - sizeof(m_nBlockLen);
  72             m_nBlockLen = nRealBlockLength;
  73             m_xMarkStream->jumpToMark(m_nBlockStart);
  74             m_xOutStream->writeLong(m_nBlockLen);
  75             m_xMarkStream->jumpToFurthest();
  76             m_xMarkStream->deleteMark(m_nBlockStart);
  77         }
  78     }
  79     catch(const css::uno::Exception&)
  80     {
  81     }
  82 }
  83
  84
  85 }   // namespace comphelper
  86
  87
  88 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */