include/tools/zcodec.hxx

   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 _ZCODEC_HXX
  21 #define _ZCODEC_HXX
  22
  23 #include "tools/toolsdllapi.h"
  24 #include <tools/solar.h>
  25
  26 // Defines
  27
  28 #define DEFAULT_IN_BUFSIZE          (0x00008000UL)
  29 #define DEFAULT_OUT_BUFSIZE         (0x00008000UL)
  30
  31 #define MAX_MEM_USAGE 8
  32
  33 // memory requirement using compress:
  34 //  [ INBUFFER ] + [ OUTBUFFER ] + 128KB + 1 << (MEM_USAGE+9)
  35 // memory requirement using decompress:
  36 //  [ INBUFFER ] + [ OUTBUFFER ] + 32KB
  37
  38 #define ZCODEC_NO_COMPRESSION       (0x00000000UL)
  39 #define ZCODEC_BEST_SPEED           (0x00000001UL)
  40 #define ZCODEC_DEFAULT_COMPRESSION  (0x00000006UL)
  41 #define ZCODEC_BEST_COMPRESSION     (0x00000009UL)
  42
  43 #define ZCODEC_DEFAULT_STRATEGY     (0x00000000UL)
  44 #define ZCODEC_ZFILTERED            (0x00000100UL)
  45 #define ZCODEC_ZHUFFMAN_ONLY        (0x00000200UL)
  46
  47 #define ZCODEC_UPDATE_CRC           (0x00010000UL)
  48 #define ZCODEC_GZ_LIB               (0x00020000UL)
  49
  50 #define ZCODEC_PNG_DEFAULT ( ZCODEC_NO_COMPRESSION | ZCODEC_DEFAULT_STRATEGY | ZCODEC_UPDATE_CRC )
  51 #define ZCODEC_DEFAULT  ( ZCODEC_DEFAULT_COMPRESSION | ZCODEC_DEFAULT_STRATEGY )
  52
  53 class SvStream;
  54
  55 class TOOLS_DLLPUBLIC ZCodec
  56 {
  57 private:
  58     sal_uIntPtr     mbInit;
  59     sal_Bool        mbStatus;
  60     sal_Bool        mbFinish;
  61     sal_uIntPtr     mnMemUsage;
  62     SvStream*       mpIStm;
  63     sal_uInt8*      mpInBuf;
  64     sal_uIntPtr     mnInBufSize;
  65     sal_uIntPtr     mnInToRead;
  66     SvStream*       mpOStm;
  67     sal_uInt8*      mpOutBuf;
  68     sal_uIntPtr     mnOutBufSize;
  69
  70     sal_uIntPtr     mnCRC;
  71     sal_uIntPtr     mnCompressMethod;
  72     void*           mpsC_Stream;
  73
  74     void            ImplInitBuf( sal_Bool nIOFlag );
  75     void            ImplWriteBack( void );
  76
  77 public:
  78                     ZCodec( sal_uIntPtr nInBuf, sal_uIntPtr nOutBuf, sal_uIntPtr nMemUsage = MAX_MEM_USAGE );
  79                     ZCodec( void );
  80     virtual         ~ZCodec();
  81
  82     virtual void    BeginCompression( sal_uIntPtr nCompressMethod = ZCODEC_DEFAULT );
  83     virtual long    EndCompression();
  84     sal_Bool        IsFinished () const { return mbFinish; }
  85
  86     long            Compress( SvStream& rIStm, SvStream& rOStm );
  87     long            Decompress( SvStream& rIStm, SvStream& rOStm );
  88
  89     long            Write( SvStream& rOStm, const sal_uInt8* pData, sal_uIntPtr nSize );
  90     long            Read( SvStream& rIStm, sal_uInt8* pData, sal_uIntPtr nSize );
  91     long            ReadAsynchron( SvStream& rIStm, sal_uInt8* pData, sal_uIntPtr nSize );
  92
  93     void            SetBreak( sal_uIntPtr );
  94     sal_uIntPtr     GetBreak( void );
  95     void            SetCRC( sal_uIntPtr nCurrentCRC );
  96     sal_uIntPtr     UpdateCRC( sal_uIntPtr nLatestCRC, sal_uInt8* pSource, long nDatSize );
  97     sal_uIntPtr     GetCRC();
  98 };
  99
 100 class GZCodec : public ZCodec
 101 {
 102 public:
 103                     GZCodec(){};
 104                     ~GZCodec(){};
 105     virtual void    BeginCompression( sal_uIntPtr nCompressMethod = ZCODEC_DEFAULT );
 106 };
 107
 108 #endif
 109
 110 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */