zcodec.hxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
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#ifndef INCLUDED_TOOLS_ZCODEC_HXX
#define INCLUDED_TOOLS_ZCODEC_HXX
 
#include <tools/toolsdllapi.h>
#include <tools/long.hxx>
#include <memory>
#include <rtl/string.hxx>
 
#define ZCODEC_NO_COMPRESSION       0
#define ZCODEC_DEFAULT_COMPRESSION  6
 
class SvStream;
 
// The overall client call protocol is one of:
// * BeginCompression, Compress, EndCompression
// * BeginCompression, SetCompressionMetadata, Compress, EndCompression (for gz files)
// * BeginCompression, Decompress, EndCompression
// * BeginCompression, Write*, EndCompression
// * BeginCompression, Read*, EndCompression
// * BeginCompression, ReadAsynchron*, EndCompression
class SAL_WARN_UNUSED TOOLS_DLLPUBLIC ZCodec
{
    enum State { STATE_INIT, STATE_DECOMPRESS, STATE_COMPRESS };
    State           meState;
    bool            mbStatus;
    bool            mbFinish;
    std::unique_ptr<sal_uInt8[]> mpInBuf;
    size_t          mnInBufSize;
    size_t          mnInToRead;
    SvStream*       mpOStm;
    std::unique_ptr<sal_uInt8[]> mpOutBuf;
    size_t          mnOutBufSize;
    sal_uInt32      mnUncompressedSize;
    sal_uInt32      mnInBufCRC32;
    sal_uInt32      mnLastModifiedTime;
    OString         msFilename;
 
    int             mnCompressLevel;
    bool            mbGzLib;
    void*           mpsC_Stream;
 
    void            InitCompress();
    void            InitDecompress(SvStream & inStream);
    void            ImplWriteBack();
 
public:
                    ZCodec( size_t nInBufSize = 32768, size_t nOutBufSize = 32768 );
                    ~ZCodec();
    static bool IsZCompressed( SvStream& rIStm );
 
    void            BeginCompression( int nCompressLevel = ZCODEC_DEFAULT_COMPRESSION, bool gzLib = false );
    tools::Long            EndCompression();
 
    void            SetCompressionMetadata( const OString& sFilename,
                            sal_uInt32 nLastModifiedTime, sal_uInt32 nInBufCRC32 );
    void            Compress( SvStream& rIStm, SvStream& rOStm );
    tools::Long            Decompress( SvStream& rIStm, SvStream& rOStm );
    bool            AttemptDecompression( SvStream& rIStm, SvStream& rOStm );
 
    void            Write( SvStream& rOStm, const sal_uInt8* pData, sal_uInt32 nSize );
    tools::Long            Read( SvStream& rIStm, sal_uInt8* pData, sal_uInt32 nSize );
};
 
#endif
 
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