dcmdata/include/dcmtk/dcmdata/dcitem.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:  Gerd Ehlers
 *
 *  Purpose: Interface of class DcmItem
 *
 *  Last Update:      $Author: joergr $
 *  Update Date:      $Date: 2010-11-02 15:31:06 $
 *  CVS/RCS Revision: $Revision: 1.83 $
 *  Status:           $State: Exp $
 *
 *  CVS/RCS Log at end of file
 *
 */


#ifndef DCITEM_H
#define DCITEM_H

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

#include "dcmtk/ofstd/offile.h"       /* for offile_off_t */
#include "dcmtk/dcmdata/dctypes.h"
#include "dcmtk/dcmdata/dcobject.h"
#include "dcmtk/dcmdata/dclist.h"
#include "dcmtk/dcmdata/dcpcache.h"


// forward declaration
class DcmSequenceOfItems;
class DcmElement;


class DcmItem
  : public DcmObject
{
  public:

    DcmItem();

    DcmItem(const DcmTag &tag,
            const Uint32 len = 0);

    DcmItem(const DcmItem &old);

    DcmItem &operator=(const DcmItem &obj);

    virtual ~DcmItem();

    virtual DcmObject *clone() const
    {
      return new DcmItem(*this);
    }

    virtual OFCondition copyFrom(const DcmObject& rhs);

    virtual DcmEVR ident() const;

    virtual unsigned long getVM();

    virtual unsigned long card() const;

    virtual OFBool isLeaf() const { return OFFalse; }

    virtual void print(STD_NAMESPACE ostream&out,
                       const size_t flags = 0,
                       const int level = 0,
                       const char *pixelFileName = NULL,
                       size_t *pixelCounter = NULL);

    virtual Uint32 calcElementLength(const E_TransferSyntax xfer,
                                     const E_EncodingType enctype);

    virtual Uint32 getLength(const E_TransferSyntax xfer = EXS_LittleEndianImplicit,
                             const E_EncodingType enctype = EET_UndefinedLength);

    virtual void transferInit();

    virtual void transferEnd();

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

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

    virtual OFCondition write(
      DcmOutputStream &outStream,
      const E_TransferSyntax oxfer,
      const E_EncodingType enctype,
      DcmWriteCache *wcache);

    virtual OFCondition writeXML(STD_NAMESPACE ostream&out,
                                 const size_t flags = 0);

    virtual OFCondition writeSignatureFormat(
      DcmOutputStream &outStream,
      const E_TransferSyntax oxfer,
      const E_EncodingType enctype,
      DcmWriteCache *wcache);

    virtual OFBool containsUnknownVR() const;

    virtual OFBool containsExtendedCharacters(const OFBool checkAllStrings = OFFalse);

    virtual OFBool isAffectedBySpecificCharacterSet() const;

    virtual OFCondition insert(DcmElement *elem,
                               OFBool replaceOld = OFFalse,
                               OFBool checkInsertOrder = OFFalse);

    virtual DcmElement *getElement(const unsigned long num);

    virtual OFCondition nextObject(DcmStack &stack,
                                   const OFBool intoSub);

    virtual DcmObject *nextInContainer(const DcmObject *obj);

    virtual DcmElement *remove(const unsigned long num);

    virtual DcmElement *remove(DcmObject *elem);

    virtual DcmElement *remove(const DcmTagKey &tag);

    virtual OFBool isEmpty(const OFBool normalize = OFTrue);

    virtual OFCondition clear();

    virtual OFCondition verify(const OFBool autocorrect = OFFalse );

    virtual OFCondition search(const DcmTagKey &xtag,              // in
                               DcmStack &resultStack,              // inout
                               E_SearchMode mode = ESM_fromHere,   // in
                               OFBool searchIntoSub = OFTrue );    // in

    virtual OFCondition loadAllDataIntoMemory();

    virtual OFCondition computeGroupLengthAndPadding(const E_GrpLenEncoding glenc,
                                                     const E_PaddingEncoding padenc = EPD_noChange,
                                                     const E_TransferSyntax xfer = EXS_Unknown,
                                                     const E_EncodingType enctype = EET_ExplicitLength,
                                                     const Uint32 padlen = 0,
                                                     const Uint32 subPadlen = 0,
                                                     Uint32 instanceLength = 0);


    OFBool tagExists(const DcmTagKey &key,
                     OFBool searchIntoSub = OFFalse);

    OFBool tagExistsWithValue(const DcmTagKey &key,
                              OFBool searchIntoSub = OFFalse);

    /* --- findAndGet functions: find an element and get it or the value, respectively --- */

    OFCondition findAndGetElement(const DcmTagKey &tagKey,
                                  DcmElement *&element,
                                  const OFBool searchIntoSub = OFFalse,
                                  const OFBool createCopy = OFFalse);

    OFCondition findAndGetElements(const DcmTagKey &tagKey,
                                   DcmStack &resultStack);

    OFCondition findAndGetString(const DcmTagKey &tagKey,
                                 const char *&value,
                                 const OFBool searchIntoSub = OFFalse);

    OFCondition findAndGetOFString(const DcmTagKey &tagKey,
                                   OFString &value,
                                   const unsigned long pos = 0,
                                   const OFBool searchIntoSub = OFFalse);

    OFCondition findAndGetOFStringArray(const DcmTagKey &tagKey,
                                        OFString &value,
                                        const OFBool searchIntoSub = OFFalse);

    OFCondition findAndGetUint8(const DcmTagKey &tagKey,
                                Uint8 &value,
                                const unsigned long pos = 0,
                                const OFBool searchIntoSub = OFFalse);

    OFCondition findAndGetUint8Array(const DcmTagKey &tagKey,
                                     const Uint8 *&value,
                                     unsigned long *count = NULL,
                                     const OFBool searchIntoSub = OFFalse);

    OFCondition findAndGetUint16(const DcmTagKey &tagKey,
                                 Uint16 &value,
                                 const unsigned long pos = 0,
                                 const OFBool searchIntoSub = OFFalse);

    OFCondition findAndGetUint16Array(const DcmTagKey &tagKey,
                                      const Uint16 *&value,
                                      unsigned long *count = NULL,
                                      const OFBool searchIntoSub = OFFalse);

    OFCondition findAndGetSint16(const DcmTagKey &tagKey,
                                 Sint16 &value,
                                 const unsigned long pos = 0,
                                 const OFBool searchIntoSub = OFFalse);

    OFCondition findAndGetSint16Array(const DcmTagKey &tagKey,
                                      const Sint16 *&value,
                                      unsigned long *count = NULL,
                                      const OFBool searchIntoSub = OFFalse);

    OFCondition findAndGetUint32(const DcmTagKey &tagKey,
                                 Uint32 &value,
                                 const unsigned long pos = 0,
                                 const OFBool searchIntoSub = OFFalse);

    OFCondition findAndGetUint32Array(const DcmTagKey &tagKey,
                                      const Uint32 *&value,
                                      unsigned long *count = NULL,
                                      const OFBool searchIntoSub = OFFalse);

    OFCondition findAndGetSint32(const DcmTagKey &tagKey,
                                 Sint32 &value,
                                 const unsigned long pos = 0,
                                 const OFBool searchIntoSub = OFFalse);

    OFCondition findAndGetSint32Array(const DcmTagKey &tagKey,
                                      const Sint32 *&value,
                                      unsigned long *count = NULL,
                                      const OFBool searchIntoSub = OFFalse);

    OFCondition findAndGetLongInt(const DcmTagKey &tagKey,
                                  long int &value,
                                  const unsigned long pos = 0,
                                  const OFBool searchIntoSub = OFFalse);

    OFCondition findAndGetFloat32(const DcmTagKey &tagKey,
                                  Float32 &value,
                                  const unsigned long pos = 0,
                                  const OFBool searchIntoSub = OFFalse);

    OFCondition findAndGetFloat32Array(const DcmTagKey &tagKey,
                                       const Float32 *&value,
                                       unsigned long *count = NULL,
                                       const OFBool searchIntoSub = OFFalse);

    OFCondition findAndGetFloat64(const DcmTagKey &tagKey,
                                  Float64 &value,
                                  const unsigned long pos = 0,
                                  const OFBool searchIntoSub = OFFalse);

    OFCondition findAndGetFloat64Array(const DcmTagKey &tagKey,
                                       const Float64 *&value,
                                       unsigned long *count = NULL,
                                       const OFBool searchIntoSub = OFFalse);

    OFCondition findAndGetSequence(const DcmTagKey &seqTagKey,
                                   DcmSequenceOfItems *&sequence,
                                   const OFBool searchIntoSub = OFFalse,
                                   const OFBool createCopy = OFFalse);

    OFCondition findAndGetSequenceItem(const DcmTagKey &seqTagKey,
                                       DcmItem *&item,
                                       const signed long itemNum = 0,
                                       const OFBool createCopy = OFFalse);


    /* --- findOrCreate functions: find an element or create a new one --- */

    OFCondition findOrCreateSequenceItem(const DcmTag &seqTag,
                                         DcmItem *&item,
                                         const signed long itemNum = 0);

    /* --- findAndXXX functions: find an element and do something with it --- */

    OFCondition findAndInsertCopyOfElement(const DcmTagKey &tagKey,
                                           DcmItem *destItem,
                                           const OFBool replaceOld = OFTrue);

    OFCondition findAndDeleteElement(const DcmTagKey &tagKey,
                                     const OFBool allOccurrences = OFFalse,
                                     const OFBool searchIntoSub = OFFalse);

    OFCondition findAndDeleteSequenceItem(const DcmTagKey &seqTagKey,
                                          const signed long itemNum);


    /* --- putAndInsert functions: put value and insert new element --- */

    OFCondition putAndInsertString(const DcmTag &tag,
                                   const char *value,
                                   const OFBool replaceOld = OFTrue);

    OFCondition putAndInsertOFStringArray(const DcmTag &tag,
                                          const OFString &value,
                                          const OFBool replaceOld = OFTrue);

    OFCondition putAndInsertUint8Array(const DcmTag &tag,
                                       const Uint8 *value,
                                       const unsigned long count,
                                       const OFBool replaceOld = OFTrue);

    OFCondition putAndInsertUint16(const DcmTag &tag,
                                   const Uint16 value,
                                   const unsigned long pos = 0,
                                   const OFBool replaceOld = OFTrue);

    OFCondition putAndInsertUint16Array(const DcmTag &tag,
                                        const Uint16 *value,
                                        const unsigned long count,
                                        const OFBool replaceOld = OFTrue);

    OFCondition putAndInsertSint16(const DcmTag &tag,
                                   const Sint16 value,
                                   const unsigned long pos = 0,
                                   const OFBool replaceOld = OFTrue);

    OFCondition putAndInsertSint16Array(const DcmTag &tag,
                                        const Sint16 *value,
                                        const unsigned long count,
                                        const OFBool replaceOld = OFTrue);

    OFCondition putAndInsertUint32(const DcmTag &tag,
                                   const Uint32 value,
                                   const unsigned long pos = 0,
                                   const OFBool replaceOld = OFTrue);

    OFCondition putAndInsertSint32(const DcmTag &tag,
                                   const Sint32 value,
                                   const unsigned long pos = 0,
                                   const OFBool replaceOld = OFTrue);

    OFCondition putAndInsertFloat32(const DcmTag &tag,
                                    const Float32 value,
                                    const unsigned long pos = 0,
                                    const OFBool replaceOld = OFTrue);

    OFCondition putAndInsertFloat64(const DcmTag &tag,
                                    const Float64 value,
                                    const unsigned long pos = 0,
                                    const OFBool replaceOld = OFTrue);


    /* --- insertXXX functions: insert new element --- */

    OFCondition insertEmptyElement(const DcmTag &tag,
                                   const OFBool replaceOld = OFTrue);

    OFCondition insertSequenceItem(const DcmTag &seqTag,
                                   DcmItem *item,
                                   const signed long itemNum = -2);

  protected:

    DcmList *elementList;

    OFBool lastElementComplete;

    offile_off_t fStartPosition;

  protected:

    OFCondition readTagAndLength(DcmInputStream &inStream,       // inout
                                 const E_TransferSyntax xfer,    // in
                                 DcmTag &tag,                    // out
                                 Uint32 &length,                 // out
                                 Uint32 &bytesRead);             // out

    OFCondition readSubElement(DcmInputStream &inStream,         // inout
                               DcmTag &newTag,                   // inout
                               const Uint32 newLength,           // in
                               const E_TransferSyntax xfer,      // in
                               const E_GrpLenEncoding glenc,     // in
                               const Uint32 maxReadLength = DCM_MaxReadLength);

    E_TransferSyntax checkTransferSyntax(DcmInputStream &inStream);

    void checkAndUpdateVR(DcmItem &item,
                          DcmTag &tag);


  private:

    OFCondition searchSubFromHere(const DcmTagKey &tag,          // in
                                  DcmStack &resultStack,         // inout
                                  OFBool searchIntoSub );        // in

    static OFBool foundVR(const Uint8* atposition);

    DcmPrivateTagCache privateCreatorCache;
};

//
// SUPPORT FUNCTIONS
//

OFCondition newDicomElement(DcmElement *&newElement,
                            DcmTag &tag,
                            const Uint32 length,
                            DcmPrivateTagCache *privateCreatorCache,
                            OFBool& readAsUN);

OFCondition newDicomElement(DcmElement *&newElement,
                            const DcmTag &tag,
                            const Uint32 length = 0);

DcmElement *newDicomElement(const DcmTag &tag,
                            const Uint32 length = 0);

OFCondition nextUp(DcmStack &st);


#endif // DCITEM_H


/*
** CVS/RCS Log:
** $Log: dcitem.h,v $
** Revision 1.83  2010-11-02 15:31:06  joergr
** Added special handling for data elements that are associated with different
** VRs (according to the data dictinary) when read with an implicit transfer
** syntax, e.g. PixelPaddingValue or WaveformData.
**
** Revision 1.82  2010-10-14 13:15:41  joergr
** Updated copyright header. Added reference to COPYRIGHT file.
**
** Revision 1.81  2010-10-01 13:55:01  joergr
** Added new helper function findAndInsertCopyOfElement().
**
** Revision 1.80  2010-03-01 09:08:44  uli
** Removed some unnecessary include directives in the headers.
**
** Revision 1.79  2010-02-22 11:39:53  uli
** Remove some unneeded includes.
**
** Revision 1.78  2009-09-02 09:58:21  joergr
** Revised documentation of parameter "pos" for some putAndInsertXXX() functions
** in order to make clear what the possible range of values is.
**
** Revision 1.77  2009-08-07 14:40:38  joergr
** Enhanced isEmpty() method by checking whether the data element value consists
** of non-significant characters only.
**
** Revision 1.76  2009-03-25 10:22:09  joergr
** Added new method isEmpty() to DICOM object, item and sequence class.
**
** Revision 1.75  2009-03-05 14:07:56  onken
** Fixed typo.
**
** Revision 1.74  2009-03-05 13:35:47  onken
** Added checks for sequence and item lengths which prevents overflow in length
** field, if total length of contained items (or sequences) exceeds
** 32-bit length field. Also introduced new flag (default: enabled)
** for writing in explicit length mode, which allows for automatically
** switching encoding of only that very sequence/item to undefined
** length coding (thus permitting to actually write the file).
**
** Revision 1.73  2009-02-04 17:52:17  joergr
** Fixes various type mismatches reported by MSVC introduced with OFFile class.
**
** Revision 1.72  2008-12-12 11:44:40  onken
** Moved path access functions to separate classes
**
** Revision 1.71  2008-12-05 13:28:14  onken
** Splitted findOrCreatePath() function API for also offering a simple API
** for non-wildcard searches.
**
** Revision 1.70  2008-12-04 16:55:14  onken
** Changed findOrCreatePath() to also support wildcard as item numbers.
**
** Revision 1.69  2008-11-26 12:08:22  joergr
** Updated documentation of newDicomElement() in order to reflect the current
** implementation.
**
** Revision 1.68  2008-10-15 12:31:20  onken
** Added findOrCreatePath() functions which allow for finding or creating a
** hierarchy of sequences, items and attributes according to a given "path"
** string.
**
** Revision 1.67  2008-07-17 11:19:48  onken
** Updated copyFrom() documentation.
**
** Revision 1.66  2008-07-17 10:30:23  onken
** Implemented copyFrom() method for complete DcmObject class hierarchy, which
** permits setting an instance's value from an existing object. Implemented
** assignment operator where necessary.
**
** Revision 1.65  2008-06-23 12:09:13  joergr
** Fixed inconsistencies in Doxygen API documentation.
**
** Revision 1.64  2007/11/29 14:30:19  meichel
** Write methods now handle large raw data elements (such as pixel data)
**   without loading everything into memory. This allows very large images to
**   be sent over a network connection, or to be copied without ever being
**   fully in memory.
**
** Revision 1.63  2007/09/21 10:40:15  onken
** Changed foundVR() API and implementation to use Uint8* instead of char* to
** avoid calls to isalpha() with negative arguments (undef. behaviour/assertion)
**
** Revision 1.62  2007/06/29 14:17:49  meichel
** Code clean-up: Most member variables in module dcmdata are now private,
**   not protected anymore.
**
** Revision 1.61  2007/06/08 14:56:04  joergr
** Added new helper functions insertSequenceItem(), findAndDeleteSequenceItem().
** Replaced helper function findAndCopyElement() by new optional parameter
** 'createCopy' in various findAndGetXXX() functions.
**
** Revision 1.60  2007/03/09 10:38:13  joergr
** Added support for missing VRs (SL, SS, UL, SS) to insertEmptyElement().
**
** Revision 1.59  2007/02/19 15:04:34  meichel
** Removed searchErrors() methods that are not used anywhere and added
**   error() methods only in the DcmObject subclasses where really used.
**
** Revision 1.58  2006/12/15 14:18:07  joergr
** Added new method that checks whether a DICOM object or element is affected
** by SpecificCharacterSet (0008,0005).
**
** Revision 1.57  2006/12/13 13:58:14  joergr
** Added new optional parameter "checkAllStrings" to method containsExtended
** Characters().
**
** Revision 1.56  2006/08/15 15:49:56  meichel
** Updated all code in module dcmdata to correctly compile when
**   all standard C++ classes remain in namespace std.
**
** Revision 1.55  2006/05/30 15:01:52  joergr
** Modified comment of method containsExtendedCharacters().
**
** Revision 1.54  2006/05/11 08:54:00  joergr
** Moved checkForNonASCIICharacters() from application to library.
**
** Revision 1.53  2005/12/08 16:28:19  meichel
** Changed include path schema for all DCMTK header files
**
** Revision 1.52  2005/11/15 18:28:02  meichel
** Added new global flag dcmEnableUnknownVRConversion that enables the automatic
**   re-conversion of defined length UN elements read in an explicit VR transfer
**   syntax, if the real VR is defined in the data dictionary. Default is OFFalse,
**   i.e. to retain the previous behavior.
**
** Revision 1.51  2005/06/24 10:03:14  joergr
** Added support for internal VR "xs" to putAndInsertXXX() helper methods.
**
** Revision 1.50  2004/07/01 12:28:25  meichel
** Introduced virtual clone method for DcmObject and derived classes.
**
** Revision 1.49  2004/02/04 16:02:08  joergr
** Removed pointer declaration from parameter "resultStack" in method
** findAndGetElements().
**
** Revision 1.48  2003/10/08 10:24:40  joergr
** Added support for AT, OB, OF, OW, SL, SS, UL, US to putAndInsertString().
**
** Revision 1.47  2003/07/16 14:34:05  joergr
** Added new function findAndGetSequence().
**
** Revision 1.46  2003/06/26 09:17:25  onken
** Added commandline-application dcmodify.
**
** Revision 1.45  2003/06/12 13:33:46  joergr
** Fixed inconsistent API documentation reported by Doxygen.
**
** Revision 1.44  2003/06/02 17:16:23  joergr
** Added new helper function DcmItem::findAndCopyElement().
**
** Revision 1.43  2003/06/02 16:58:12  meichel
** Renamed local variables to avoid name clashes with STL
**
** Revision 1.42  2003/05/20 09:01:58  joergr
** Added new helper methods: findAndGetElement(), findAndGetUint32Array(),
** FindAndGetSint32Array(), findAndGetFloat64Array(), findAndDeleteElement().
** Enhanced findAndGetSequenceItem() and findOrCreateSequenceItem() by checking
** the return value of ident() - avoids crashes when applied to non-sequence
** elements.
**
** Revision 1.41  2002/12/09 09:31:15  wilkens
** Modified/Added doc++ documentation.
**
** Revision 1.40  2002/12/06 12:49:10  joergr
** Enhanced "print()" function by re-working the implementation and replacing
** the boolean "showFullData" parameter by a more general integer flag.
** Added doc++ documentation.
** Made source code formatting more consistent with other modules/files.
**
** Revision 1.39  2002/08/27 16:55:34  meichel
** Initial release of new DICOM I/O stream classes that add support for stream
**   compression (deflated little endian explicit VR transfer syntax)
**
** Revision 1.38  2002/08/02 08:42:44  joergr
** Added optional 'pos' parameter to the putAndInsertXXX() methods.
**
** Revision 1.37  2002/07/23 14:21:26  meichel
** Added support for private tag data dictionaries to dcmdata
**
** Revision 1.36  2002/06/26 15:47:40  joergr
** Added support for polymorp OB/OW value representation (e.g. pixel data) to
** putAndInsertUint8/16Array() methods.
**
** Revision 1.35  2002/05/17 09:58:14  meichel
** fixed bug in DcmItem which caused the parser to fail if the same attribute
**   tag appeared twice within one dataset (which is illegal in DICOM anyway).
**   Added console warning if the attributes read are not in ascending order.
**
** Revision 1.34  2002/04/25 10:06:46  joergr
** Added support for XML output of DICOM objects.
**
** Revision 1.33  2001/12/18 11:37:24  joergr
** Added helper method allowing to create and insert empty elements into an
** item/dataset.
**
** Revision 1.32  2001/11/16 15:54:38  meichel
** Adapted digital signature code to final text of supplement 41.
**
** Revision 1.31  2001/11/09 15:51:59  joergr
** Added new helper routines for managing sequences and items.
**
** Revision 1.30  2001/10/10 15:14:04  joergr
** Changed parameter DcmTagKey to DcmTag in DcmItem::putAndInsert... methods
** to support elements which are not in the data dictionary (e.g. private
** extensions).
**
** Revision 1.29  2001/10/02 11:46:45  joergr
** Added functions to get/put 8 bit values/arrays from/to an item/dataset.
**
** Revision 1.28  2001/10/01 15:01:14  joergr
** Introduced new general purpose functions to get/put DICOM element values
** from/to an item/dataset - removed some old and rarely used functions.
**
** Revision 1.27  2001/09/25 17:19:26  meichel
** Adapted dcmdata to class OFCondition
**
** Revision 1.26  2001/06/01 15:48:40  meichel
** Updated copyright header
**
** Revision 1.25  2000/11/07 16:56:06  meichel
** Initial release of dcmsign module for DICOM Digital Signatures
**
** Revision 1.24  2000/04/14 15:31:32  meichel
** Removed default value from output stream passed to print() method.
**   Required for use in multi-thread environments.
**
** Revision 1.23  2000/03/08 16:26:15  meichel
** Updated copyright header.
**
** Revision 1.22  2000/03/03 14:05:24  meichel
** Implemented library support for redirecting error messages into memory
**   instead of printing them to stdout/stderr for GUI applications.
**
** Revision 1.21  2000/02/10 10:50:51  joergr
** Added new feature to dcmdump (enhanced print method of dcmdata): write
** pixel data/item value fields to raw files.
**
** Revision 1.20  1999/03/31 09:24:40  meichel
** Updated copyright header in module dcmdata
**
** Revision 1.19  1998/07/15 15:48:48  joergr
** Removed several compiler warnings reported by gcc 2.8.1 with
** additional options, e.g. missing copy constructors and assignment
** operators, initialization of member variables in the body of a
** constructor instead of the member initialization list, hiding of
** methods by use of identical names, uninitialized member variables,
** missing const declaration of char pointers. Replaced tabs by spaces.
**
** Revision 1.18  1997/09/22 14:50:43  hewett
** - Added 2 simple methods to test for the existance of an attribute
**   to DcmItem class (tagExists and tagExistsWithValue).  This code
**   was part of dcmgpdir.cc but is more generally useful.
** - Added 2 methods to find an attribute and retrieve numeric values
**   to DcmItem class (findIntegerNumber and findRealNumber).  The old
**   method findLong is now marked as obsolete and reimplemented using
**   findIntegerNumber.
**
** Revision 1.17  1997/09/11 15:13:11  hewett
** Modified getOFString method arguments by removing a default value
** for the pos argument.  By requiring the pos argument to be provided
** ensures that callers realise getOFString only gets one component of
** a multi-valued string.
**
** Revision 1.16  1997/08/29 08:32:39  andreas
** - Added methods getOFString and getOFStringArray for all
**   string VRs. These methods are able to normalise the value, i. e.
**   to remove leading and trailing spaces. This will be done only if
**   it is described in the standard that these spaces are not relevant.
**   These methods do not test the strings for conformance, this means
**   especially that they do not delete spaces where they are not allowed!
**   getOFStringArray returns the string with all its parts separated by \
**   and getOFString returns only one value of the string.
**   CAUTION: Currently getString returns a string with trailing
**   spaces removed (if dcmEnableAutomaticInputDataCorrection == OFTrue) and
**   truncates the original string (since it is not copied!). If you rely on this
**   behaviour please change your application now.
**   Future changes will ensure that getString returns the original
**   string from the DICOM object (NULL terminated) inclusive padding.
**   Currently, if you call getOF... before calling getString without
**   normalisation, you can get the original string read from the DICOM object.
**
** Revision 1.15  1997/07/21 08:25:08  andreas
** - Replace all boolean types (BOOLEAN, CTNBOOLEAN, DICOM_BOOL, BOOL)
**   with one unique boolean type OFBool.
**
** Revision 1.14  1997/07/07 07:42:03  andreas
** - Changed parameter type DcmTag & to DcmTagKey & in all search functions
**   in DcmItem, DcmSequenceOfItems, DcmDirectoryRecord and DcmObject
**
** Revision 1.13  1997/05/30 06:45:42  andreas
** - fixed problem of inconsistent interfaces and implementation that the
**   syntax check of GNU C++ does not find.
**
** Revision 1.12  1997/05/27 13:48:28  andreas
** - Add method canWriteXfer to class DcmObject and all derived classes.
**   This method checks whether it is possible to convert the original
**   transfer syntax to an new transfer syntax. The check is used in the
**   dcmconv utility to prohibit the change of a compressed transfer
**   syntax to a uncompressed.
**
** Revision 1.11  1997/05/16 08:13:43  andreas
** - Revised handling of GroupLength elements and support of
**   DataSetTrailingPadding elements. The enumeratio E_GrpLenEncoding
**   got additional enumeration values (for a description see dctypes.h).
**   addGroupLength and removeGroupLength methods are replaced by
**   computeGroupLengthAndPadding. To support Padding, the parameters of
**   element and sequence write functions changed.
** - Added a new method calcElementLength to calculate the length of an
**   element, item or sequence. For elements it returns the length of
**   tag, length field, vr field, and value length, for item and
**   sequences it returns the length of the whole item. sequence including
**   the Delimitation tag (if appropriate).  It can never return
**   UndefinedLength.
** - Deleted obsolete method DcmItem::calcHeaderLength because the
**   samce functionality is performed by DcmXfer::sizeofTagHeader
**
** Revision 1.10  1996/08/05 08:45:23  andreas
** new print routine with additional parameters:
**         - print into files
**         - fix output length for elements
** corrected error in search routine with parameter ESM_fromStackTop
**
** Revision 1.9  1996/07/17 12:38:58  andreas
** new nextObject to iterate a DicomDataset, DicomFileFormat, Item, ...
**
** Revision 1.8  1996/04/29 15:08:53  hewett
** Replaced DcmItem::findInt(...) with the more general DcmItem::findLong(...).
**
** Revision 1.7  1996/04/16 16:00:05  andreas
** - added const for Tag in newDicomElement
**
** Revision 1.6  1996/03/28 18:52:30  hewett
** Added 2 simple find&get methods (findString & findInt).
**
** Revision 1.5  1996/01/29 13:38:12  andreas
** - new put method for every VR to put value as a string
** - better and unique print methods
**
** Revision 1.4  1996/01/09 11:06:15  andreas
** New Support for Visual C++
** Correct problems with inconsistent const declarations
**
** Revision 1.3  1996/01/05 13:22:56  andreas
** - changed to support new streaming facilities
** - more cleanups
** - merged read / write methods for block and file transfer
**
*/

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