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 |*
27 |* Ctor
28 |*
29 \******************************************************************************/
30 
31 IMapCompat::IMapCompat( SvStream& rStm, const StreamMode nStreamMode )
32  : pRWStm(&rStm)
33  , nCompatPos(0)
34  , nTotalSize(0)
35  , nStmMode(nStreamMode)
36 {
37  DBG_ASSERT( nStreamMode == StreamMode::READ || nStreamMode == StreamMode::WRITE, "Wrong Mode!" );
38 
39  if ( pRWStm->GetError() )
40  return;
41 
42  if ( nStmMode == StreamMode::WRITE )
43  {
44  nCompatPos = pRWStm->Tell();
45  pRWStm->SeekRel( 4 );
46  nTotalSize = nCompatPos + 4;
47  }
48  else
49  {
50  sal_uInt32 nTotalSizeTmp;
51  pRWStm->ReadUInt32( nTotalSizeTmp );
52  nTotalSize = nTotalSizeTmp;
53  nCompatPos = pRWStm->Tell();
54  }
55 }
56 
57 
58 /******************************************************************************
59 |*
60 |* Dtor
61 |*
62 \******************************************************************************/
63 
65 {
66  if ( pRWStm->GetError() )
67  return;
68 
69  if ( nStmMode == StreamMode::WRITE )
70  {
71  const sal_uInt64 nEndPos = pRWStm->Tell();
72 
74  pRWStm->WriteUInt32( nEndPos - nTotalSize );
75  pRWStm->Seek( nEndPos );
76  }
77  else
78  {
79  const sal_uInt64 nReadSize = pRWStm->Tell() - nCompatPos;
80 
81  if ( nTotalSize > nReadSize )
82  pRWStm->SeekRel( nTotalSize - nReadSize );
83  }
84 }
85 
86 
87 /* 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:64
StreamMode
sal_uInt64 nCompatPos
Definition: imap.hxx:123
sal_uInt64 Tell() const
StreamMode const nStmMode
Definition: imap.hxx:125
SvStream * pRWStm
Definition: imap.hxx:122