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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             : #ifndef INCLUDED_TOOLS_ZCODEC_HXX
      21             : #define INCLUDED_TOOLS_ZCODEC_HXX
      22             : 
      23             : #include <tools/toolsdllapi.h>
      24             : 
      25             : #define ZCODEC_NO_COMPRESSION       0
      26             : #define ZCODEC_DEFAULT_COMPRESSION  6
      27             : 
      28             : class SvStream;
      29             : 
      30             : // The overall client call protocol is one of:
      31             : // * BeginCompression, Compress, EndCompression
      32             : // * BeginCompression, Decompress, EndCompression
      33             : // * BeginCompression, Write*, EndCompression
      34             : // * BeginCompression, Read*, EndCompression
      35             : // * BeginCompression, ReadAsynchron*, EndCompression
      36             : class TOOLS_DLLPUBLIC ZCodec
      37             : {
      38             :     enum State { STATE_INIT, STATE_DECOMPRESS, STATE_COMPRESS };
      39             :     State           meState;
      40             :     bool            mbStatus;
      41             :     bool            mbFinish;
      42             :     sal_uInt8*      mpInBuf;
      43             :     sal_uIntPtr     mnInBufSize;
      44             :     sal_uIntPtr     mnInToRead;
      45             :     SvStream*       mpOStm;
      46             :     sal_uInt8*      mpOutBuf;
      47             :     sal_uIntPtr     mnOutBufSize;
      48             : 
      49             :     sal_uIntPtr     mnCRC;
      50             :     int             mnCompressLevel;
      51             :     bool            mbUpdateCrc;
      52             :     bool            mbGzLib;
      53             :     void*           mpsC_Stream;
      54             : 
      55             :     void            InitCompress();
      56             :     void            InitDecompress(SvStream & inStream);
      57             :     void            ImplWriteBack();
      58             : 
      59             :     void            UpdateCRC( sal_uInt8* pSource, long nDatSize );
      60             : 
      61             : public:
      62             :                     ZCodec( sal_uIntPtr nInBuf = 0x8000UL, sal_uIntPtr nOutBuf = 0x8000UL );
      63             :                     ~ZCodec();
      64             : 
      65             :     void            BeginCompression( int nCompressLevel = ZCODEC_DEFAULT_COMPRESSION, bool updateCrc = false, bool gzLib = false );
      66             :     long            EndCompression();
      67             : 
      68             :     long            Compress( SvStream& rIStm, SvStream& rOStm );
      69             :     long            Decompress( SvStream& rIStm, SvStream& rOStm );
      70             :     bool            AttemptDecompression( SvStream& rIStm, SvStream& rOStm, bool updateCrc = false, bool gzLib = false );
      71             : 
      72             :     long            Write( SvStream& rOStm, const sal_uInt8* pData, sal_uIntPtr nSize );
      73             :     long            Read( SvStream& rIStm, sal_uInt8* pData, sal_uIntPtr nSize );
      74             :     long            ReadAsynchron( SvStream& rIStm, sal_uInt8* pData, sal_uIntPtr nSize );
      75             : 
      76             :     void            SetBreak( sal_uIntPtr );
      77             :     sal_uIntPtr     GetBreak();
      78             :     void            SetCRC( sal_uIntPtr nCurrentCRC );
      79         176 :     sal_uIntPtr     GetCRC() { return mnCRC;}
      80             : };
      81             : 
      82             : #endif
      83             : 
      84             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */