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 <com/sun/star/io/XMarkableStream.hpp>
  22 #include <com/sun/star/io/XDataInputStream.hpp>
  23 #include <com/sun/star/io/XDataOutputStream.hpp>
  24 #include <osl/diagnose.h>
  25
  26 namespace comphelper
  27 {
  28
  29
  30 OStreamSection::OStreamSection(const css::uno::Reference< css::io::XDataInputStream >& _rxInput)
  31     :m_xMarkStream(_rxInput, css::uno::UNO_QUERY)
  32     ,m_xInStream(_rxInput)
  33     ,m_nBlockStart(-1)
  34     ,m_nBlockLen(-1)
  35 {
  36     OSL_ENSURE(m_xInStream.is() && m_xMarkStream.is(), "OStreamSection::OStreamSection : invalid argument !");
  37     if (m_xInStream.is() && m_xMarkStream.is())
  38     {
  39         m_nBlockLen = _rxInput->readLong();
  40         m_nBlockStart = m_xMarkStream->createMark();
  41     }
  42 }
  43
  44
  45 OStreamSection::OStreamSection(const css::uno::Reference< css::io::XDataOutputStream >& _rxOutput)
  46     :m_xMarkStream(_rxOutput, css::uno::UNO_QUERY)
  47     ,m_xOutStream(_rxOutput)
  48     ,m_nBlockStart(-1)
  49     ,m_nBlockLen(-1)
  50 {
  51     OSL_ENSURE(m_xOutStream.is() && m_xMarkStream.is(), "OStreamSection::OStreamSection : invalid argument !");
  52     if (m_xOutStream.is() && m_xMarkStream.is())
  53     {
  54         m_nBlockStart = m_xMarkStream->createMark();
  55         m_nBlockLen = 0;
  56         m_xOutStream->writeLong(m_nBlockLen);
  57     }
  58 }
  59
  60
  61 OStreamSection::~OStreamSection()
  62 {
  63     try
  64     {   // don't allow any exceptions to leave this block, this may be called during the stack unwinding of an exception
  65         // handling routing
  66         if (m_xInStream.is() &&  m_xMarkStream.is())
  67         {   // we're working on an input stream
  68             m_xMarkStream->jumpToMark(m_nBlockStart);
  69             m_xInStream->skipBytes(m_nBlockLen);
  70             m_xMarkStream->deleteMark(m_nBlockStart);
  71         }
  72         else if (m_xOutStream.is() && m_xMarkStream.is())
  73         {
  74             sal_Int32 nRealBlockLength = m_xMarkStream->offsetToMark(m_nBlockStart) - sizeof(m_nBlockLen);
  75             m_nBlockLen = nRealBlockLength;
  76             m_xMarkStream->jumpToMark(m_nBlockStart);
  77             m_xOutStream->writeLong(m_nBlockLen);
  78             m_xMarkStream->jumpToFurthest();
  79             m_xMarkStream->deleteMark(m_nBlockStart);
  80         }
  81     }
  82     catch(const css::uno::Exception&)
  83     {
  84     }
  85 }
  86
  87
  88 }   // namespace comphelper
  89
  90
  91 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */