svx/source/gallery2/codec.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
  21 #include <sal/log.hxx>
  22 #include <tools/stream.hxx>
  23 #include <tools/zcodec.hxx>
  24 #include "codec.hxx"
  25 #include <memory>
  26
  27
  28 GalleryCodec::GalleryCodec( SvStream& rIOStm ) :
  29     rStm( rIOStm )
  30 {
  31 }
  32
  33 bool GalleryCodec::IsCoded( SvStream& rStm, sal_uInt32& rVersion )
  34 {
  35     const sal_uInt64   nPos = rStm.Tell();
  36     bool        bRet;
  37     sal_uInt8       cByte1, cByte2, cByte3, cByte4, cByte5, cByte6;
  38
  39     rStm.ReadUChar( cByte1 ).ReadUChar( cByte2 ).ReadUChar( cByte3 ).ReadUChar( cByte4 ).ReadUChar( cByte5 ).ReadUChar( cByte6 );
  40
  41     if (rStm.good() && cByte1 == 'S' && cByte2 == 'V' && cByte3 == 'R' && cByte4 == 'L' && cByte5 == 'E' && ( cByte6 == '1' || cByte6 == '2' ) )
  42     {
  43         rVersion = ( ( cByte6 == '1' ) ? 1 : 2 );
  44         bRet = true;
  45     }
  46     else
  47     {
  48         rVersion = 0;
  49         bRet = false;
  50     }
  51
  52     rStm.Seek( nPos );
  53
  54     return bRet;
  55 }
  56
  57 void GalleryCodec::Write( SvStream& rStmToWrite )
  58 {
  59     sal_uInt32 nPos, nCompSize;
  60
  61     const sal_uInt32 nSize = rStmToWrite.TellEnd();
  62     rStmToWrite.Seek( 0 );
  63
  64     rStm.WriteChar( 'S' ).WriteChar( 'V' ).WriteChar( 'R' ).WriteChar( 'L' ).WriteChar( 'E' ).WriteChar( '2' );
  65     rStm.WriteUInt32( nSize );
  66
  67     nPos = rStm.Tell();
  68     rStm.SeekRel( 4 );
  69
  70     ZCodec aCodec;
  71     aCodec.BeginCompression();
  72     aCodec.Compress( rStmToWrite, rStm );
  73     aCodec.EndCompression();
  74
  75     nCompSize = rStm.Tell() - nPos - 4;
  76     rStm.Seek( nPos );
  77     rStm.WriteUInt32( nCompSize );
  78     rStm.Seek( STREAM_SEEK_TO_END );
  79 }
  80
  81 void GalleryCodec::Read( SvStream& rStmToRead )
  82 {
  83     sal_uInt32 nVersion = 0;
  84
  85     if( !IsCoded( rStm, nVersion ) )
  86         return;
  87
  88     rStm.SeekRel( 14 );
  89
  90     // decompress
  91     if( 1 == nVersion )
  92     {
  93         SAL_WARN("svx", "staroffice binary file formats are no longer supported inside the gallery!");
  94     }
  95     else if( 2 == nVersion )
  96     {
  97         ZCodec aCodec;
  98
  99         aCodec.BeginCompression();
 100         aCodec.Decompress( rStm, rStmToRead );
 101         aCodec.EndCompression();
 102     }
 103 }
 104
 105 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */