dcmdata/include/dcmtk/dcmdata/dcistrma.h

/*
 *
 *  Copyright (C) 1994-2010, OFFIS e.V.
 *  All rights reserved.  See COPYRIGHT file for details.
 *
 *  This software and supporting documentation were developed by
 *
 *    OFFIS e.V.
 *    R&D Division Health
 *    Escherweg 2
 *    D-26121 Oldenburg, Germany
 *
 *
 *  Module:  dcmdata
 *
 *  Author:  Marco Eichelberg
 *
 *  Purpose: base classes for input streams
 *
 *  Last Update:      $Author: joergr $
 *  Update Date:      $Date: 2010-10-14 13:15:41 $
 *  CVS/RCS Revision: $Revision: 1.5 $
 *  Status:           $State: Exp $
 *
 *  CVS/RCS Log at end of file
 *
 */

#ifndef DCISTRMA_H
#define DCISTRMA_H

#include "dcmtk/config/osconfig.h"
#include "dcmtk/ofstd/oftypes.h"  /* for OFBool */
#include "dcmtk/ofstd/ofcond.h"   /* for OFCondition */
#include "dcmtk/ofstd/offile.h"   /* for offile_off_t */
#include "dcmtk/dcmdata/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() = 0;

  virtual offile_off_t avail() = 0;

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

  virtual offile_off_t skip(offile_off_t skiplen) = 0;

  virtual void putback(offile_off_t 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();

  virtual offile_off_t avail();

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

  virtual offile_off_t skip(offile_off_t skiplen);

  virtual offile_off_t 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_;

  offile_off_t tell_;

  offile_off_t mark_;
};



#endif

/*
 * CVS/RCS Log:
 * $Log: dcistrma.h,v $
 * Revision 1.5  2010-10-14 13:15:41  joergr
 * Updated copyright header. Added reference to COPYRIGHT file.
 *
 * Revision 1.4  2009-11-04 09:58:07  uli
 * Switched to logging mechanism provided by the "new" oflog module
 *
 * Revision 1.3  2007-02-19 15:45:41  meichel
 * Class DcmInputStream and related classes are now safe for use with
 *   large files (2 GBytes or more) if supported by compiler and operating system.
 *
 * Revision 1.2  2005/12/08 16:28:15  meichel
 * Changed include path schema for all DCMTK header files
 *
 * 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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