LibreOffice Module comphelper (master)  1
streamsection.cxx
Go to the documentation of this file.
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 
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: */