dcobject.h

转化为DIB位图再显示出来的dicom文件C++代码

/*
 *
 *  Copyright (C) 1994-2005, 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:  Gerd Ehlers
 *
 *  Purpose:
 *  This file contains the interface to routines which provide
 *  DICOM object encoding/decoding, search and lookup facilities.
 *
 *  Last Update:      $Author: meichel $
 *  Update Date:      $Date: 2005/12/08 16:28:22 $
 *  CVS/RCS Revision: $Revision: 1.41 $
 *  Status:           $State: Exp $
 *
 *  CVS/RCS Log at end of file
 *
 */


#ifndef DCOBJECT_H
#define DCOBJECT_H

#include "dcmtk/config/osconfig.h"    /* make sure OS specific configuration is included first */

#include "dcmtk/ofstd/ofconsol.h"
#include "dcmtk/ofstd/ofglobal.h"
#include "dcmtk/dcmdata/dcerror.h"
#include "dcmtk/dcmdata/dctypes.h"
#include "dcmtk/dcmdata/dcxfer.h"
#include "dcmtk/dcmdata/dctag.h"
#include "dcmtk/dcmdata/dclist.h"
#include "dcmtk/dcmdata/dcstack.h"


// forward declarations
class DcmOutputStream;
class DcmInputStream;


// Undefined Length Identifier now defined in dctypes.h

// Maxinum number of read bytes for a Value Element
const Uint32 DCM_MaxReadLength = 4096;

// Maximum length of tag and length in a DICOM element
const Uint32 DCM_TagInfoLength = 12;

// Optimum line length if not all data printed
const Uint32 DCM_OptPrintLineLength = 70;

// Optimum value length if not all data printed
const Uint32 DCM_OptPrintValueLength = 40;


/** This flags defines whether automatic correction should be applied to input
 *  data (e.g. stripping of padding blanks, removal of blanks in UIDs, etc).
 *  Default is enabled.
 */
extern OFGlobal<OFBool> dcmEnableAutomaticInputDataCorrection; /* default OFTrue */

/** This flag defines the handling of illegal odd-length attributes: If flag is
 *  true, odd lengths are respected (i.e. an odd number of bytes is read from
 *  the input stream.) After successful reading, padding to even number of bytes
 *  is enforced by adding a zero pad byte if dcmEnableAutomaticInputDataCorrection
 *  is true. Otherwise the odd number of bytes remains as read.
 *
 *  If flag is false, old (pre DCMTK 3.5.2) behaviour applies: The length field
 *  implicitly incremented and an even number of bytes is read from the stream.
 */
extern OFGlobal<OFBool> dcmAcceptOddAttributeLength; /* default OFTrue */

/** This flag defines how UN attributes with undefined length are treated
 *  by the parser when reading. The default is to expect the content of the
 *  UN element (up to and including the sequence delimitation item)
 *  to be encoded in Implicit VR Little Endian, as described in CP 246.
 *  DCMTK expects the attribute to be encoded like a DICOM sequence, i.e.
 *  the content of each item is parsed as a DICOM dataset.
 *  If the flag is disabled old (pre DCMTK 3.5.4) behaviour applies: The
 *  attribute is treated as if it was an Explicit VR SQ element.
 *
 *  Note that the flag only affects the read behaviour but not the write
 *  behaviour - DCMTK will never write UN elements with undefined length.
 */
extern OFGlobal<OFBool> dcmEnableCP246Support; /* default OFTrue */

/** DCMTK releases up to 3.5.3 created a non-conforming byte stream
 *  as input to the MAC algorithm when creating or verifying digital signatures
 *  including compressed pixel data (i.e. signatures including attribute
 *  (7FE0,0010) in an encapsulated transfer syntax). This has been fixed
 *  in DCMTK 3.5.4, but this flag allows to revert to the old behavior
 *  in order to create or verify signatures that are compatible with older
 *  releases. Default is "off" (OFFalse).
 */
extern OFGlobal<OFBool> dcmEnableOldSignatureFormat; /* default OFFalse */

/** This flag defines whether the transfer syntax for uncompressed datasets
 *  is detected automatically.  The automatic detection has been introduced
 *  since there are (incorrectly encoded) DICOM dataset stored with a
 *  different transfer syntax than specified in the meta header.
 */
extern OFGlobal<OFBool> dcmAutoDetectDatasetXfer; /* default OFFalse */

/** base class for all DICOM objects defined in 'dcmdata'
 */
class DcmObject
{

  public:

    /** constructor.
     *  Create new object from given tag and length.
     *  @param tag DICOM tag for the new element
     *  @param len value length for the new element
     */
    DcmObject(const DcmTag &tag,
              const Uint32 len = 0);

    /** copy constructor
     *  @param obj item to be copied
     */
    DcmObject(const DcmObject &obj);

    /** destructor
     */
    virtual ~DcmObject();

    /** clone method
     *  @return deep copy of this object
     */
    virtual DcmObject *clone() const = 0;

    /** assignment operator
     *  @param obj object to be assigned/copied
     *  @return reference to this object
     */
    DcmObject &operator=(const DcmObject &obj);

    /** get type identifier (abstract)
     *  @return type identifier of this class
     */
    virtual DcmEVR ident() const = 0;

    // current value representation. If object was read from a stream
    // getVR returns the read value representation. It is possible that
    // this vr is not the same as mentioned in the data dictionary
    // (e.g. private tags, encapsulated data ...)
    inline DcmEVR getVR() const { return Tag.getEVR(); }

    inline OFBool isaString() const { return Tag.getVR().isaString(); }

    virtual OFBool isLeaf() const = 0;

    /** print object to a stream
     *  @param out output stream
     *  @param flags optional flag used to customize the output (see DCMTypes::PF_xxx)
     *  @param level current level of nested items. Used for indentation.
     *  @param pixelFileName not used
     *  @param pixelCounter not used
     */
    virtual void print(ostream &out,
                       const size_t flags = 0,
                       const int level = 0,
                       const char *pixelFileName = NULL,
                       size_t *pixelCounter = NULL) = 0;

    inline OFCondition error() const { return errorFlag; }

    inline E_TransferState transferState() const { return fTransferState; }
    virtual void transferInit(void);
    virtual void transferEnd(void);

    inline Uint16 getGTag() const { return Tag.getGTag(); }
    inline Uint16 getETag() const { return Tag.getETag(); }
    inline const DcmTag &getTag() const { return Tag; }
    inline void setGTag(Uint16 gtag) { Tag.setGroup(gtag); }

    virtual OFCondition setVR(DcmEVR /*vr*/) { return EC_IllegalCall; }
    virtual unsigned long getVM() = 0;

    // calculate length of Dicom element
    virtual Uint32 calcElementLength(const E_TransferSyntax xfer,
                                     const E_EncodingType enctype) = 0;

    // returns value length
    virtual Uint32 getLength(const E_TransferSyntax xfer = EXS_LittleEndianImplicit,
                             const E_EncodingType enctype = EET_UndefinedLength) = 0;

    virtual OFBool canWriteXfer(const E_TransferSyntax newXfer,
                                const E_TransferSyntax oldXfer) = 0;

    virtual OFCondition read(DcmInputStream &inStream,
                             const E_TransferSyntax ixfer,
                             const E_GrpLenEncoding glenc = EGL_noChange,
                             const Uint32 maxReadLength = DCM_MaxReadLength) = 0;

    /** write object to a stream (abstract)
     *  @param outStream DICOM output stream
     *  @param oxfer output transfer syntax
     *  @param enctype encoding types (undefined or explicit length)
     *  @return status, EC_Normal if successful, an error code otherwise
     */
    virtual OFCondition write(DcmOutputStream &outStream,
                              const E_TransferSyntax oxfer,
                              const E_EncodingType enctype = EET_UndefinedLength) = 0;

    /** write object in XML format to a stream
     *  @param out output stream to which the XML document is written
     *  @param flags optional flag used to customize the output (see DCMTypes::XF_xxx)
     *  @return status, always returns EC_Illegal Call
     */