tools/source/stream/cachestr.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 <tools/stream.hxx>
  21 #include <tools/cachestr.hxx>
  22 #include <tools/tempfile.hxx>
  23
  24 SvCacheStream::SvCacheStream( sal_uIntPtr nMaxMemSize )
  25 {
  26     if( !nMaxMemSize )
  27         nMaxMemSize = 20480;
  28     SvStream::bIsWritable = sal_True;
  29     nMaxSize        = nMaxMemSize;
  30     bPersistent     = sal_False;
  31     pSwapStream     = 0;
  32     pCurrentStream  = new SvMemoryStream( nMaxMemSize );
  33     pTempFile       = 0;
  34 }
  35
  36 SvCacheStream::~SvCacheStream()
  37 {
  38        if( pCurrentStream != pSwapStream )
  39         delete pSwapStream;
  40     delete pCurrentStream;
  41
  42     if( pSwapStream && !bPersistent && pTempFile )
  43     {
  44         // temporaeres File loeschen
  45         pTempFile->EnableKillingFile( sal_True );
  46     }
  47
  48     delete pTempFile;
  49 }
  50
  51 void SvCacheStream::SwapOut()
  52 {
  53     if( pCurrentStream != pSwapStream )
  54     {
  55         if( !pSwapStream && !aFileName.Len() )
  56         {
  57             pTempFile = new TempFile;
  58             aFileName = pTempFile->GetName();
  59         }
  60
  61         sal_uIntPtr nPos = pCurrentStream->Tell();
  62         pCurrentStream->Seek( 0 );
  63         if( !pSwapStream )
  64             pSwapStream = new SvFileStream( aFileName, STREAM_READWRITE | STREAM_TRUNC );
  65         *pSwapStream << *pCurrentStream;
  66         pSwapStream->Flush();
  67         delete pCurrentStream;
  68         pCurrentStream = pSwapStream;
  69         pCurrentStream->Seek( nPos );
  70     }
  71 }
  72
  73 sal_uIntPtr SvCacheStream::GetData( void* pData, sal_uIntPtr nSize )
  74 {
  75     return pCurrentStream->Read( pData, nSize );
  76 }
  77
  78 sal_uIntPtr SvCacheStream::PutData( const void* pData, sal_uIntPtr nSize )
  79 {
  80     // prefer swapping data instead copying it again
  81     if( pCurrentStream != pSwapStream
  82         && pCurrentStream->Tell() + nSize > nMaxSize )
  83         SwapOut();
  84     return pCurrentStream->Write( pData, nSize );
  85 }
  86
  87 sal_uIntPtr SvCacheStream::SeekPos( sal_uIntPtr nPos )
  88 {
  89     return pCurrentStream->Seek( nPos );
  90 }
  91
  92 void SvCacheStream::FlushData()
  93 {
  94     pCurrentStream->Flush();
  95     if( pCurrentStream != pSwapStream
  96         && ((SvMemoryStream*)pCurrentStream)->GetSize() > nMaxSize )
  97         SwapOut();
  98 }
  99
 100 const void* SvCacheStream::GetBuffer()
 101 {
 102     Flush();
 103     if( pCurrentStream != pSwapStream )
 104         return ((SvMemoryStream*)pCurrentStream)->GetData();
 105     else
 106         return 0;
 107 }
 108
 109 void SvCacheStream::SetSize( sal_uIntPtr nSize )
 110 {
 111     pCurrentStream->SetStreamSize( nSize );
 112 }
 113
 114 sal_uIntPtr SvCacheStream::GetSize()
 115 {
 116     // CAUTION: SvMemoryStream::GetSize() returns size of the allocated buffer
 117     Flush();
 118     sal_uIntPtr nTemp = Tell();
 119     sal_uIntPtr nLength = Seek( STREAM_SEEK_TO_END );
 120     Seek( nTemp );
 121     return nLength;
 122 }
 123
 124 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */