dcmdata/include/dcistrma.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: base classes for input streams
 *
 *  Last Update:      $Author: meichel $
 *  Update Date:      $Date: 2002/08/27 16:55:32 $
 *  Source File:      $Source: /share/dicom/cvs-depot/dcmtk/dcmdata/include/dcistrma.h,v $
 *  CVS/RCS Revision: $Revision: 1.1 $
 *  Status:           $State: Exp $
 *
 *  CVS/RCS Log at end of file
 *
 */

#ifndef DCISTRMA_H
#define DCISTRMA_H

#include "osconfig.h"
#include "oftypes.h"  /* for OFBool */
#include "ofcond.h"   /* for OFCondition */
#include "dcxfer.h"   /* for E_StreamCompression */

class DcmInputStream;

class DcmProducer
{
public:

  virtual ~DcmProducer()
  {
  }

  virtual OFBool good() const = 0;

  virtual OFCondition status() const = 0;

  virtual OFBool eos() const = 0;

  virtual Uint32 avail() const = 0;

  virtual Uint32 read(void *buf, Uint32 buflen) = 0;

  virtual Uint32 skip(Uint32 skiplen) = 0;

  virtual void putback(Uint32 num) = 0;

};


class DcmInputFilter: public DcmProducer
{
public:

  virtual ~DcmInputFilter()
  {
  }

  virtual void append(DcmProducer& producer) = 0;
};


class DcmInputStreamFactory
{
public:

  virtual ~DcmInputStreamFactory()
  {
  }

  virtual DcmInputStream *create() const = 0;

  virtual DcmInputStreamFactory *clone() const = 0;
};


class DcmInputStream
{
public:

  virtual ~DcmInputStream();

  virtual OFBool good() const;

  virtual OFCondition status() const;

  virtual OFBool eos() const;

  virtual Uint32 avail() const;

  virtual Uint32 read(void *buf, Uint32 buflen);

  virtual Uint32 skip(Uint32 skiplen);

  virtual Uint32 tell() const;

  virtual OFCondition installCompressionFilter(E_StreamCompression filterType);

  virtual DcmInputStreamFactory *newFactory() const = 0;

  virtual void mark();

  virtual void putback();

protected:

  DcmInputStream(DcmProducer *initial);

  const DcmProducer *currentProducer() const;

private:

  DcmInputStream(const DcmInputStream&);

  DcmInputStream& operator=(const DcmInputStream&);

  DcmProducer *current_;

  DcmInputFilter *compressionFilter_;

  Uint32 tell_;

  Uint32 mark_;
};



#endif

/*
 * CVS/RCS Log:
 * $Log: dcistrma.h,v $
 * Revision 1.1  2002/08/27 16:55:32  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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