LibreOffice Module vcl (master)  1
imap3.cxx
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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 <vcl/imap.hxx>
21 
22 #include <tools/debug.hxx>
23 
24 /******************************************************************************
25 |*
26 |* Ctor
27 |*
28 \******************************************************************************/
29 
30 IMapCompat::IMapCompat(SvStream& rStm, const StreamMode nStreamMode)
31  : pRWStm(&rStm)
32  , nCompatPos(0)
33  , nTotalSize(0)
34  , nStmMode(nStreamMode)
35 {
36  DBG_ASSERT(nStreamMode == StreamMode::READ || nStreamMode == StreamMode::WRITE, "Wrong Mode!");
37 
38  if (pRWStm->GetError())
39  return;
40 
41  if (nStmMode == StreamMode::WRITE)
42  {
43  nCompatPos = pRWStm->Tell();
44  pRWStm->SeekRel(4);
45  nTotalSize = nCompatPos + 4;
46  }
47  else
48  {
49  sal_uInt32 nTotalSizeTmp;
50  pRWStm->ReadUInt32(nTotalSizeTmp);
51  nTotalSize = nTotalSizeTmp;
52  nCompatPos = pRWStm->Tell();
53  }
54 }
55 
56 /******************************************************************************
57 |*
58 |* Dtor
59 |*
60 \******************************************************************************/
61 
63 {
64  if (pRWStm->GetError())
65  return;
66 
67  if (nStmMode == StreamMode::WRITE)
68  {
69  const sal_uInt64 nEndPos = pRWStm->Tell();
70 
72  pRWStm->WriteUInt32(nEndPos - nTotalSize);
73  pRWStm->Seek(nEndPos);
74  }
75  else
76  {
77  const sal_uInt64 nReadSize = pRWStm->Tell() - nCompatPos;
78 
79  if (nTotalSize > nReadSize)
80  pRWStm->SeekRel(nTotalSize - nReadSize);
81  }
82 }
83 
84 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
sal_uInt64 nTotalSize
Definition: imap.hxx:124
sal_uInt64 Seek(sal_uInt64 nPos)
sal_uInt64 SeekRel(sal_Int64 nPos)
IMapCompat(const IMapCompat &)=delete
ErrCode GetError() const
SvStream & WriteUInt32(sal_uInt32 nUInt32)
SvStream & ReadUInt32(sal_uInt32 &rUInt32)
#define DBG_ASSERT(sCon, aError)
~IMapCompat()
Definition: imap3.cxx:62
StreamMode
sal_uInt64 nCompatPos
Definition: imap.hxx:123
StreamMode nStmMode
Definition: imap.hxx:125
sal_uInt64 Tell() const
SvStream * pRWStm
Definition: imap.hxx:122