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CompressOutputStream.h

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#ifndef CLASSLIB_COMPRESS_OUTPUT_STREAM_H
# define CLASSLIB_COMPRESS_OUTPUT_STREAM_H

//<<<<<< INCLUDES                                                       >>>>>>

# include "classlib/sysapi/system.h"
# include "classlib/iotools/FilterOutputStream.h"

namespace lat {
//<<<<<< PUBLIC DEFINES                                                 >>>>>>
//<<<<<< PUBLIC CONSTANTS                                               >>>>>>
//<<<<<< PUBLIC TYPES                                                   >>>>>>

class Compressor;
class Checksum;
class OutputStream;

//<<<<<< PUBLIC VARIABLES                                               >>>>>>
//<<<<<< PUBLIC FUNCTIONS                                               >>>>>>
//<<<<<< CLASS DECLARATIONS                                             >>>>>>

class CompressOutputStream : public FilterOutputStream
{
public:
    enum { DEFAULT_BUF_SIZE = 4096 };

    CompressOutputStream (Compressor    *compressor,
                          Checksum      *checksum,
                          OutputStream  *output,
                          IOSize        bufsize = DEFAULT_BUF_SIZE);
    ~CompressOutputStream (void);

    using FilterOutputStream::write;
    virtual IOSize      write (const void *from, IOSize n);
    virtual void        flush (void);
    virtual void        finish (void);
    virtual void        close (void);

    virtual unsigned    checksum (void) const;

protected:
    virtual void        compress (void);
    virtual void        restart (void);

    Compressor          *m_compressor;  //< Compression engine
    Checksum            *m_checksum;    //< Optional checksum accumulator
    unsigned char       *m_buffer;      //< Compression buffer
    IOSize              m_size;         //< Compression buffer size
    bool                m_finished;     //< Inidicates that #finish() was done

private:
    // undefined, no semantics
    CompressOutputStream (const CompressOutputStream &);
    CompressOutputStream &operator= (const CompressOutputStream &);
};

//<<<<<< INLINE PUBLIC FUNCTIONS                                        >>>>>>
//<<<<<< INLINE MEMBER FUNCTIONS                                        >>>>>>

} // namespace lat
#endif // CLASSLIB_COMPRESS_OUTPUT_STREAM_H

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