svtools/source/misc/imap3.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 <svtools/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     {
  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 /******************************************************************************
  59 |*
  60 |* Dtor
  61 |*
  62 \******************************************************************************/
  63
  64 IMapCompat::~IMapCompat()
  65 {
  66     if ( !pRWStm->GetError() )
  67     {
  68         if ( nStmMode == StreamMode::WRITE )
  69         {
  70             const sal_uLong nEndPos = pRWStm->Tell();
  71
  72             pRWStm->Seek( nCompatPos );
  73             pRWStm->WriteUInt32( nEndPos - nTotalSize );
  74             pRWStm->Seek( nEndPos );
  75         }
  76         else
  77         {
  78             const sal_uLong nReadSize = pRWStm->Tell() - nCompatPos;
  79
  80             if ( nTotalSize > nReadSize )
  81                 pRWStm->SeekRel( nTotalSize - nReadSize );
  82         }
  83     }
  84 }
  85
  86
  87
  88 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */