dcmdata/include/dcmtk/dcmdata/dcistrmf.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: DcmInputFileStream and related classes,
 *    implements streamed input from files.
 *
 *  Last Update:      $Author: joergr $
 *  Update Date:      $Date: 2010-10-14 13:15:41 $
 *  CVS/RCS Revision: $Revision: 1.9 $
 *  Status:           $State: Exp $
 *
 *  CVS/RCS Log at end of file
 *
 */

#ifndef DCISTRMF_H
#define DCISTRMF_H

#include "dcmtk/config/osconfig.h"
#include "dcmtk/dcmdata/dcistrma.h"


class DcmFileProducer: public DcmProducer
{
public:
  DcmFileProducer(const char *filename, offile_off_t offset = 0);

  virtual ~DcmFileProducer();

  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 void putback(offile_off_t num);

private:

  DcmFileProducer(const DcmFileProducer&);

  DcmFileProducer& operator=(const DcmFileProducer&);

  OFFile file_;

  OFCondition status_;

  offile_off_t size_;
};


class DcmInputFileStreamFactory: public DcmInputStreamFactory
{
public:

  DcmInputFileStreamFactory(const char *filename, offile_off_t offset);

  DcmInputFileStreamFactory(const DcmInputFileStreamFactory &arg);

  virtual ~DcmInputFileStreamFactory();

  virtual DcmInputStream *create() const;

  virtual DcmInputStreamFactory *clone() const
  {
    return new DcmInputFileStreamFactory(*this);
  }

private:


  DcmInputFileStreamFactory& operator=(const DcmInputFileStreamFactory&);

  OFString filename_;

  offile_off_t offset_;

};


class DcmInputFileStream: public DcmInputStream
{
public:
  DcmInputFileStream(const char *filename, offile_off_t offset = 0);

  virtual ~DcmInputFileStream();

  virtual DcmInputStreamFactory *newFactory() const;

private:

  DcmInputFileStream(const DcmInputFileStream&);

  DcmInputFileStream& operator=(const DcmInputFileStream&);

  DcmFileProducer producer_;

  OFString filename_;
};

class DcmTempFileHandler
{
public:

  static DcmTempFileHandler *newInstance(const char *fname);

  DcmInputStream *create() const;

  void increaseRefCount();

  void decreaseRefCount();

private:

  DcmTempFileHandler(const char *fname);

  virtual ~DcmTempFileHandler();

  DcmTempFileHandler(const DcmTempFileHandler& arg);

  DcmTempFileHandler& operator=(const DcmTempFileHandler& arg);

  size_t refCount_;

#ifdef WITH_THREADS
  OFMutex mutex_;
#endif

  OFString filename_;

};

class DcmInputTempFileStreamFactory: public DcmInputStreamFactory
{
public:

  DcmInputTempFileStreamFactory(DcmTempFileHandler *handler);

  DcmInputTempFileStreamFactory(const DcmInputTempFileStreamFactory &arg);

  virtual ~DcmInputTempFileStreamFactory();

  virtual DcmInputStream *create() const;

  virtual DcmInputStreamFactory *clone() const;

private:

  DcmInputTempFileStreamFactory& operator=(const DcmInputTempFileStreamFactory&);

  DcmTempFileHandler *fileHandler_;

};


#endif

/*
 * CVS/RCS Log:
 * $Log: dcistrmf.h,v $
 * Revision 1.9  2010-10-14 13:15:41  joergr
 * Updated copyright header. Added reference to COPYRIGHT file.
 *
 * Revision 1.8  2010-10-04 14:44:39  joergr
 * Replaced "#ifdef _REENTRANT" by "#ifdef WITH_THREADS" where appropriate (i.e.
 * in all cases where OFMutex, OFReadWriteLock, etc. are used).
 *
 * Revision 1.7  2010-03-01 09:08:44  uli
 * Removed some unnecessary include directives in the headers.
 *
 * Revision 1.6  2009-11-04 09:58:07  uli
 * Switched to logging mechanism provided by the "new" oflog module
 *
 * Revision 1.5  2008-05-29 10:39:43  meichel
 * Implemented new classes DcmTempFileHandler and DcmInputTempFileStreamFactory
 *   that perform thread-safe reference counted life cycle management of a
 *   temporary file and are needed for DcmElement temporary file extensions to come.
 *
 * Revision 1.4  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 1.3  2005/12/08 16:28:17  meichel
 * Changed include path schema for all DCMTK header files
 *
 * Revision 1.2  2002/11/27 12:07:21  meichel
 * Adapted module dcmdata to use of new header file ofstdinc.h
 *
 * Revision 1.1  2002/08/27 16:55:33  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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