dcostrmz.h

/*
 *
 *  Copyright (C) 1994-2002, OFFIS
 *
 *  This software and supporting documentation were developed by
 *
 *    Kuratorium OFFIS e.V.
 *    Healthcare Information and Communication Systems
 *    Escherweg 2
 *    D-26121 Oldenburg, Germany
 *
 *  THIS SOFTWARE IS MADE AVAILABLE,  AS IS,  AND OFFIS MAKES NO  WARRANTY
 *  REGARDING  THE  SOFTWARE,  ITS  PERFORMANCE,  ITS  MERCHANTABILITY  OR
 *  FITNESS FOR ANY PARTICULAR USE, FREEDOM FROM ANY COMPUTER DISEASES  OR
 *  ITS CONFORMITY TO ANY SPECIFICATION. THE ENTIRE RISK AS TO QUALITY AND
 *  PERFORMANCE OF THE SOFTWARE IS WITH THE USER.
 *
 *  Module:  dcmdata
 *
 *  Author:  Marco Eichelberg
 *
 *  Purpose: zlib compression filter for output streams
 *
 *  Last Update:      $Author: meichel $
 *  Update Date:      $Date: 2002/08/27 16:55:37 $
 *  Source File:      $Source: /share/dicom/cvs-depot/dcmtk/dcmdata/include/dcostrmz.h,v $
 *  CVS/RCS Revision: $Revision: 1.1 $
 *  Status:           $State: Exp $
 *
 *  CVS/RCS Log at end of file
 *
 */

#ifndef DCOSTRMZ_H
#define DCOSTRMZ_H

#include "osconfig.h"

#ifdef WITH_ZLIB

#include "dcostrma.h" /* for DcmOutputFilter */

BEGIN_EXTERN_C
#include <zlib.h>
END_EXTERN_C

extern OFGlobal<int> dcmZlibCompressionLevel;

class DcmZLibOutputFilter: public DcmOutputFilter
{
public:

  DcmZLibOutputFilter();

  virtual ~DcmZLibOutputFilter();

  virtual OFBool good() const;

  virtual OFCondition status() const;

  virtual OFBool isFlushed() const;

  virtual Uint32 avail() const;

  virtual Uint32 write(const void *buf, Uint32 buflen);

  virtual void flush();

  virtual void append(DcmConsumer& consumer);

private:

  DcmZLibOutputFilter(const DcmZLibOutputFilter&);

  DcmZLibOutputFilter& operator=(const DcmZLibOutputFilter&);

  void flushOutputBuffer();

  Uint32 compress(const void *buf, Uint32 buflen, OFBool finalize);

  Uint32 fillInputBuffer(const void *buf, Uint32 buflen);

  void compressInputBuffer(OFBool finalize);

  DcmConsumer *current_;

  z_streamp zstream_;

  OFCondition status_;

  OFBool flushed_;

  unsigned char *inputBuf_;

  Uint32 inputBufStart_;

  Uint32 inputBufCount_;

  unsigned char *outputBuf_;

  Uint32 outputBufStart_;

  Uint32 outputBufCount_;

};

#endif
#endif

/*
 * CVS/RCS Log:
 * $Log: dcostrmz.h,v $
 * Revision 1.1  2002/08/27 16:55:37  meichel
 * Initial release of new DICOM I/O stream classes that add support for stream
 *   compression (deflated little endian explicit VR transfer syntax)
 *
 *
 */

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