/*
 *
 *  Copyright (C) 2015-2019, Open Connections GmbH
 *  All rights reserved.  See COPYRIGHT file for details.
 *
 *  This software and supporting documentation are maintained by
 *
 *    OFFIS e.V.
 *    R&D Division Health
 *    Escherweg 2
 *    D-26121 Oldenburg, Germany
 *
 *
 *  Module:  dcmseg
 *
 *  Author:  Michael Onken
 *
 *  Purpose: Class representing a Segmentation object
 *
 */

#ifndef SEGDOC_H
#define SEGDOC_H

#include "dcmtk/config/osconfig.h"              // include OS configuration first
#include "dcmtk/ofstd/ofvector.h"               // for OFVector
#include "dcmtk/dcmiod/iodimage.h"              // common image IOD attribute access
#include "dcmtk/dcmiod/iodmacro.h"
#include "dcmtk/dcmiod/modimagepixel.h"
#include "dcmtk/dcmiod/modsegmentationseries.h" // for segmentation series module
#include "dcmtk/dcmiod/modenhequipment.h"       // for enhanced general equipment module

#include "dcmtk/dcmiod/modmultiframefg.h"       // for multi-frame functional group module
#include "dcmtk/dcmiod/modmultiframedimension.h"// for multi-frame dimension module
#include "dcmtk/dcmdata/dcvrui.h"

#include "dcmtk/dcmfg/fginterface.h"            // for multi-frame functional group interface
#include "dcmtk/dcmfg/fgfracon.h"               // for frame content functional group macro

#include "dcmtk/dcmseg/segtypes.h"              // for segmentation data types
#include "dcmtk/dcmseg/segdef.h"


// Forward declarations
class DcmSegment;
class FGSegmentation;
class FGDerivationImage;

/** Class representing an object of the "Segmentation SOP Class".
 */
class DCMTK_DCMSEG_EXPORT DcmSegmentation
: public DcmIODImage<IODImagePixelModule<Uint8> >
{

public:

  // -------------------- destruction -------------------------------

  /** Destructor, frees memory
   */
  virtual ~DcmSegmentation();

  // -------------------- loading and saving ---------------------

  /** Static method to load a Segmentation object from a file.
   *  The memory of the resulting Segmentation object has to be freed by the
   *  caller.
   *  @param  filename The file to read from
   *  @param  segmentation  The resulting segmentation object. NULL if dataset
   *          could not be read successfully.
   *  @return EC_Normal if reading was successful, error otherwise
   */
  static OFCondition loadFile(const OFString& filename,
                              DcmSegmentation*& segmentation);

  /** Static method to load a Segmentation object from a dataset object.
   *  The memory of the resulting Segmentation object has to be freed by the
   *  caller.
   *  @param  dataset The dataset to read from
   *  @param  segmentation  The resulting segmentation object. NULL if dataset
   *          could not be read successfully.
   *  @return EC_Normal if reading was successful, error otherwise
   */
  static OFCondition loadDataset(DcmDataset& dataset,
                                 DcmSegmentation*& segmentation);

  /** Save current object to given filename
   *  @param  filename The file to write to
   *  @param  writeXfer The transfer syntax to be used
   *  @return EC_Normal if writing was successful, error otherwise.
   */
  OFCondition saveFile(const OFString& filename,
                       const E_TransferSyntax writeXfer = EXS_LittleEndianExplicit);

  /** Write current object to given item
   *  @param  dataset The item to write to
   *  @return EC_Normal if writing was successful, error otherwise.
   */
  OFCondition writeDataset(DcmItem& dataset);

  /** If enabled, functional group structure is checked before actual writing
   *  is performed in the write() method. Checking might be time consuming
   *  on functional groups with many frames, though disabling might result in
   *  invalid functional group structures. Disabling should only be done if the
   *  user knows that the functional groups are valid, wants to to adapt the
   *  functional groups manually after calling write() or knows what he's doing
   *  otherwise.<br>
   *  Per default, checking is enabled.
   *  @param  doCheck If OFTrue, checking will be performed. If OFFalse,
   *          no checks are performed.
   */
  virtual void setCheckFGOnWrite(const OFBool doCheck);

  /** Returns whether functional group structure is checked before actual
   *  writing is performed in the write() method.
   *  @return OFTrue if checking is performed, OFFalse otherwise
   */
  virtual OFBool getCheckFGOnWrite();


  // -------------------- creation ---------------------

  /** Factory method to create a binary segmentation object from the minimal
   *  set of information required. The actual segments and the frame data is
   *  added separately.
   *  The memory of the resulting Segmentation object has to be freed by the
   *  caller.
   *  @param  segmentation The resulting segmentation object if provided data is
   *          valid. Otherwise NULL is returned.
   *  @param  rows Number of rows of segmentation frame data
   *  @param  columns Number of rows of segmentation frame data
   *  @param  equipmentInfo Equipment that is responsible for creating the
   *           segmentation
   *  @param  contentIdentification Basic content identification information
   *  @return EC_Normal if creation was successful, error otherwise
   */
  static OFCondition createBinarySegmentation(DcmSegmentation*& segmentation,
                                              const Uint16 rows,
                                              const Uint16 columns,
                                              const IODGeneralEquipmentModule::EquipmentInfo& equipmentInfo,
                                              const ContentIdentificationMacro& contentIdentification);

  /** Factory method to create a fractional segmentation object from the minimal
   *  set of information required. The actual segments and the frame data is
   *  added separately.
   *  The memory of the resulting Segmentation object has to be freed by the
   *  caller.
   *  @param  segmentation The resulting segmentation object if provided data is
   *          valid. Otherwise NULL is returned.
   *  @param  rows Number of rows of segmentation frame data
   *  @param  columns Number of rows of segmentation frame data
   *  @param  fractType Either probability (SFT_PROBABILITY) or
   *          occupancy (SFT_OCCUPANCY)
   *  @param  maxFractionalValue The value inside the frame data of this
   *          segmentation that represents 100% occupancy/probability
   *  @param  equipmentInfo Equipment that is responsible for creating the
   *          segmentation
   *  @param  contentIdentification Basic content identification information
   *  @return EC_Normal if creation was successful, error otherwise
   */
  static OFCondition createFractionalSegmentation(DcmSegmentation*& segmentation,
                                                  const Uint16 rows,
                                                  const Uint16 columns,
                                                  const DcmSegTypes::E_SegmentationFractionalType fractType,
                                                  const Uint16& maxFractionalValue,
                                                  const IODGeneralEquipmentModule::EquipmentInfo& equipmentInfo,
                                                  const ContentIdentificationMacro& contentIdentification);

  /** Helps to create a valid Derivation Image Functional Group Macro
   *  The memory of the resulting functional group object has to be freed by the
   *  caller.
   *  @param derivationImages to image SOP instances
   *  @param derivationDescription Free text describing how the derivation was
   *         achieved.
   *  @return The created functional group, or NULL if not successful
   */
  static FGDerivationImage* createDerivationImageFG(const OFVector<ImageSOPInstanceReferenceMacro>& derivationImages,
                                                    const OFString& derivationDescription);

  // -------------------- access ---------------------

  /** Get number of frames, based on the number of items in the shared
   *  functional functional groups sequence (i.e.\ the attribute Number of
   *  Frames) is not trusted).
   *  @return The number of frames handled by this object
   */
  size_t getNumberOfFrames();

  /** Get Segmentation Type
   *  @return Type of the segmentation, as defined by DcmSegTypes::E_SegmentationType
   */
  DcmSegTypes::E_SegmentationType getSegmentationType()
  {
    return this->m_SegmentationType;
  }

  /** Get Fractional Segmentation Type
   *  @return Type of the segmentation, as defined by
   *  DcmSegTypes::E_SegmentationFractionalTypes (returns SFT_UNKNOWN if not
   *  fractional at all)
   */
  DcmSegTypes::E_SegmentationFractionalType getSegmentationFractionalType()
  {
    return this->m_SegmentationFractionalType;
  }

  /** Get the Number of Segments
   *  @return The number of segments handled by this object
   */
  size_t getNumberOfSegments();

  /** Perform some basic checking. This method is also invoked when
   *  writing the object to a DICOM dataset or file.
   *  @param  checkFGStructure If OFTrue (default), structure of functional
   *          groups is checked, too.
   *  @return OFTrue, if no errors were found, OFFalse otherwise.
   */
  virtual OFBool check(const OFBool checkFGStructure = OFTrue);

  /** Get access to functional groups. This is meant for reading data from
   *  functional groups that are not actively managed, i.e.\ made accessible by
   *  DcmSegmentation. In rare cases, however, it makes sense to access it
   *  for writing too, e.g.\ in order to add Stacks; use with care!
   *  @return Reference to the functional groups
   */
  virtual FGInterface& getFunctionalGroups();

  /** Get General Equipment Module
   *  @return General Equipment Module
   */
  virtual IODGeneralEquipmentModule& getEquipment();

  /** Get Segmentation Series Module
   *  @return Segmentation Series Module
   */
  virtual IODSegmentationSeriesModule& getSegmentationSeriesModule();

  /** Get modality (overwrite from DcmIODCommon. We always return "SEG" here)
   *  @param  value  Reference to variable in which the value should be stored
   *  @param  pos    Index of the value to get. Not evaluated (here for
   *          consistency with other setter functions).
   *  @return status, EC_Normal if successful, an error code otherwise
   */
  virtual OFCondition getModality(OFString &value,
                                  const signed long pos = 0) const;

  /** Get segment by providing the logical segment number
   *  @param  segmentNumber The logical segment number
   *  @return The segment if segment number is valid, NULL otherwise
   */
  virtual DcmSegment* getSegment(const unsigned int segmentNumber);

  /** Get logical segment number by providing a pointer to a given segment
   *  @param  segment The segment to find the logical segment number for
   *  @param  segmentNumber The segment number. 0 if segment could not be found.
   *  @return OFTrue if segment could be found, OFFalse otherwise.
   */
  virtual OFBool getSegmentNumber(const DcmSegment* segment,
                                  unsigned int& segmentNumber);

  /** Reference to the Performed Procedure Step that led to the creation of this
   *  segmentation object. This is required if this object is created in an MPPS
   *  or GPPS workflow.
   *  @return Reference to the referenced PPS object
   */
  virtual SOPInstanceReferenceMacro& getReferencedPPS();

  /** Get (const) frame data of a specific frame
   *  @param  frameNo The number of the frame to get (starting with 0)
   *  @return The frame requested or NULL if not existing
   */
  virtual const DcmIODTypes::Frame* getFrame(const size_t& frameNo);

  /** Get the frame numbers that belong to a specific segment number
   *  @param  segmentNumber The segment to search frames for
   *  @param  frameNumbers  The frame numbers belonging to that segment
   */
  virtual void getFramesForSegment(const size_t& segmentNumber,
                                   OFVector<size_t>& frameNumbers);

  // -------------------- modification ---------------------

  /** Add segment to segmentation object
   *  @param  seg The segment that should be added
   *  @param  segmentNumber The logical segment number that was assigned for
   *          this segment. Contains 0 if adding failed.
   *  @return EC_Normal if adding was successful, error otherwise
   */
  virtual OFCondition addSegment(DcmSegment* seg,
                                 Uint16& segmentNumber);

  /** Add a functional group for all frames
   *  @param  group The group to be added as shared functional group. The
   *  @return EC_Normal if adding was successful, error otherwise
   */
  virtual OFCondition addForAllFrames(const FGBase& group);

  /** Add frame to segmentation object
   *  @param  pixData Pixel data to be added. Length must be rows*columns bytes.
   *          For binary segmentations (bit depth i.e.\ Bits
   *          Allocated/Stored=1), each byte equal to 0 will be interpreted as
   *          "not set", while every other value is interpreted as "set". For
   *          fractional segmentations the full byte is copied as is.
   *  @param  segmentNumber The logical segment number (>=1) this frame refers to.
   *          The segment identified by the segmentNumber must already exist.
   *  @param  perFrameInformation The functional groups that identify this frame (i.e.
   *          which are planned to be not common for all other frames). The
   *          functional groups are copied, so ownership of each group stays
   *          with the caller no matter what the method returns.
   *  @return EC_Normal if adding was successful, error otherwise
   */
  virtual OFCondition addFrame(Uint8* pixData,
                               const Uint16 segmentNumber,
                               const OFVector<FGBase*>& perFrameInformation);

  /** Return reference to content content identification of this segmentation object
   *  @return Reference to content identification data
   */
  virtual ContentIdentificationMacro& getContentIdentification();

  /** Return reference to multi-fame dimension module
   *  @return Reference to multi-frame dimension module
   */
  virtual IODMultiframeDimensionModule& getDimensions();

  /** Set lossy compression flag of the segmentation object to "01". If one of the
   *  source images of this segmentation has undergone lossy compression then
   *  this function should be called.
   *  @param  ratios Compression ratios (separated by backslash) of the applied
   *          lossy compression steps. Only one value (and no backslash) if only
   *          one step was performed.
   *  @param  methods Methods (separated by backslash) of the applied
   *          lossy compression steps. Only one value (and no backslash) if only
   *          one step was performed.
   *  @param  checkValues If OFTrue, the data provided is checked for validity
   *  @return EC_Normal if lossy compression info could be set, error code otherwise
   */
  virtual OFCondition setLossyImageCompressionFlag(const OFString& ratios,
                                                   const OFString& methods,
                                                   const OFBool checkValues = OFTrue);

  /** Set equipment info for this segmentation object
   *  @param  equipmentInfo  The description of the equipment used to create
   *          this segmentation
   *  @param  checkValue If OFTrue, the data provided is checked for validity
   *  @return EC_Normal if equipment information could be set successfully, error otherwise
   */
  virtual OFCondition setEquipmentInfo(const IODGeneralEquipmentModule::EquipmentInfo& equipmentInfo,
                                       const OFBool checkValue = OFTrue);

  /** Set content identification info for this segmentation object
   *  @param  contentIdentification  The content identification of this segmentation
   *  @param  checkValue If OFTrue, the data provided is checked for validity
   *          (as possible)
   *  @return EC_Normal if content identification could be set correctly, OFFalse otherwise
   */
  virtual OFCondition setContentIdentification(const ContentIdentificationMacro& contentIdentification,
                                               const OFBool checkValue = OFTrue);

  /** Import Patient, Study, and Frame of Reference level information from the
   *  given item. The method does only import Frame of Reference if Frame of
   *  Reference (FoR) UID is found in the image (and no error is reported if not).
   *  The reason is that if the source images of the segmentation do have an
   *  FoR, the segmentation object must have the same one, so we must import it.
   *  If the images do not have an FoR, we must not try at all importing it.
   *  If the log stream is set and valid the, the reason for any error might be
   *  obtained from the error/warning output.
   *  @param  dataset Reference to DICOM dataset from which the document
   *          should be read
   *  @param  takeOverCharset If OFTrue (default), Specific Character Set is
   *                          taken over from imported dataset. If it's not
   *                          present or empty (invalid), the attribute will
   *                          not be present in this class either.
   *  @return EC_Normal if successful, an error code otherwise
   */
  virtual OFCondition importFromSourceImage(DcmItem& dataset,
                                            const OFBool takeOverCharset = OFTrue);

  /** Import Patient, Study, and Frame of Reference level information from the
   *  given item. The method does only import Frame of Reference if Frame of
   *  Reference UID is found in the image (and no error is reported if not).
   *  The reason is that if the source images of the segmentation do have an
   *  FoR, the segmentation object must have the same one, so we must import it.
   *  If the images do not have an FoR, we must not try at all importing it.
   *  The current content of this object is not deleted before reading.
   *  If the log stream is set and valid the, the reason for any error might be
   *  obtained from the error/warning output.
   *  @param  filename Reference to DICOM dataset from which the document
   *          should be read
   *  @param  takeOverCharset If OFTrue (default), Specific Character Set is
   *                          taken over from imported dataset. If it's not
   *                          present or empty (invalid), the attribute will
   *                          not be present in this class either.
   *  @return EC_Normal if successful, an error code otherwise
   */
  virtual OFCondition importFromSourceImage(const OFString& filename,
                                            const OFBool takeOverCharset = OFTrue);

protected:

  /** Protected default constructor. Library users should the factory create..()
   *  method in order to create an object from scratch
   */
  DcmSegmentation();

  /** Overwrites DcmIODImage::read()
   *  @param  dataset The dataset to read from
   *  @return EC_Normal if reading succeeded, error otherwise
   */
  OFCondition read(DcmItem &dataset);

  /** Overwrites DcmIODImage::write()
   *  @param  dataset The dataset to write to
   *  @return EC_Normal if writing succeeded, error otherwise
   */
  OFCondition write(DcmItem &dataset);

  /** Create those data structures common for binary and fractional
   *  segmentations
   *  @param  segmentation The segmentation object created
   *  @param  rows The number of rows for the segmentation
   *  @param  columns The number of columns for the segmentation
   *  @param  equipmentInfo Equipment information
   *  @param  contentIdentification Content meta information
   *  @return EC_Normal if creation was successful, error otherwise
   */
  static OFCondition createCommon(DcmSegmentation*& segmentation,
                                  const Uint16 rows,
                                  const Uint16 columns,
                                  const IODGeneralEquipmentModule::EquipmentInfo& equipmentInfo,
                                  const ContentIdentificationMacro& contentIdentification);

  /** Hide same function from IODImage since do not want the user to access
  *  the image pixel module manually.
  *  @return The Image Pixel Module
  */
  virtual IODImagePixelModule<Uint8>& getImagePixel();

  /** Initialize IOD rules
   */
  virtual void initIODRules();

  /** Read segments from given item
   *  @param  item The item to read from
   *  @return EC_Normal if reading was successful, error otherwise
   */
  virtual OFCondition readSegments(DcmItem& item);

  /** Write fractional frames to given item
   *  @param  dataset The item to write to, usually main dataset level
   *  @return EC_Normal if writing was successful, error otherwise
   */
  virtual OFCondition writeFractionalFrames(DcmItem& dataset);

  /** Write binary frames to given item
   *  @param  dataset The item to write to, usually main dataset level
   *  @return EC_Normal if writing was successful, error otherwise
   */
  virtual OFCondition writeBinaryFrames(DcmItem& dataset);


  /** Write Segmentation Image Module
   *  @param dataset The item to write to, usually main dataset level
   *  @return EC_Normal if writing was successful, error otherwise
   */
  virtual OFCondition writeSegmentationImageModule(DcmItem& dataset);

  /** Write Segments
   *  @param item The item to write to
   *  @return EC_Normal if writing was successful, error otherwise
   */
  virtual OFCondition writeSegments(DcmItem& item);

  /** Write Multi-Frame Functional Groups
   *  @param dataset The item to write to, usually main dataset level
   *  @return EC_Normal if writing was successful, error otherwise
   */
  virtual OFCondition writeMultiFrameFunctionalGroupsModule(DcmItem& dataset);

  /** Write Multi-Frame Dimension Module
   *  @param dataset The item to write to, usually main dataset level
   *  @return EC_Normal if writing was successful, error otherwise
   */
  virtual OFCondition writeMultiFrameDimensionModule(DcmItem& dataset);

  /** Read frames
   *  @param  dataset Item to read from, usually main dataset level
   *  @return EC_Normal if reading was successful, error otherwise
   */
  virtual OFCondition readFrames(DcmItem& dataset);

  /** Get Image Pixel module attributes and perform some basic checking
   *  @param  dataset Item to read from, usually main dataset level
   *  @param  allocated Bits Allocated
   *  @param  stored Bits Stored
   *  @param  high High Bit
   *  @param  spp Samples Per Pixel
   *  @param  pixelRep Pixel Representation
   *  @param  rows Rows
   *  @param  cols Columns
   *  @param  numberOfFrames The number of frames (as set in the dataset)
   *  @param  colorModel The color model used
   *  @return EC_Normal if reading/checking was successful, error otherwise
   */
  virtual OFCondition getAndCheckImagePixelAttributes(DcmItem& dataset,
                                                      Uint16& allocated,
                                                      Uint16& stored,
                                                      Uint16& high,
                                                      Uint16& spp,
                                                      Uint16& pixelRep,
                                                      Uint16& rows,
                                                      Uint16& cols,
                                                      Uint16& numberOfFrames,
                                                      OFString& colorModel);

  /** Extracts Frame structures from the given pixel data element. Only
   *  applicable for binary segmentations. Within the pixel data element, all
   *  frames are packed next to each other, with the end of one frame and the
   *  beginning of the next frame packed bit by bit next to each other. The
   *  resulting Frames are a bit-by-bit copy of their original counterpart.
   *  However, their first bit is aligned to the first bit/byte in the Frame,
   *  and the unused bits in the last byte (if any) are zeroed out.
   *  @param  pixData The pixel data to read from
   *  @param  numFrames The number of frames to read
   *  @param  bitsPerFrame The number of bits per frame (usually rows * columns)
   *  @param  results The resulting frames. Memory for the frames is allocated
   *          by the method, so the Vector can/should be empty before calling.
   *  @result Return EC_Normal on success, error otherwise
   */
  virtual OFCondition extractFrames(Uint8* pixData,
                                   const size_t numFrames,
                                   const size_t bitsPerFrame,
                                   OFVector< DcmIODTypes::Frame* >& results);

  /** This is the counterpart to the extractFrames() function. It takes a number
   *  of frames that are in binary segmentation format (i.e. "bit-packed") and
   *  concatenates them together so the resulting memory block fits the Pixel
   *  Data format for binary segmentations. Thus method ensure that frames
   *  are aligned bit for bit concatenated to each other with only (if
   *  applicable) having unused bits after the last frame.
   *  @param frames The source frames
   *  @param pixData The pixel data element data to be filled. Size must be
   *         at least bitsPerFrame * number of frames.
   *  @param bitsPerFrame Bits required per frame, usually rows * columns
   */
  virtual void concatFrames(OFVector< DcmIODTypes::Frame* > frames,
                           Uint8* pixData,
                           const size_t bitsPerFrame);

  /** Add frame to segmentation object.
   *  @param  pixData Pixel data to be added. Length must be rows*columns bytes.
   *          Pixel data is copied so it must be freed by the caller.
   *  @return EC_Normal if adding was successful, error otherwise
   */
  virtual OFCondition addFrame(Uint8* pixData);

private:

  // Modules supported:
  //
  // Patient Module (through DcmIODImage)
  // Patient Study Module (through DcmIODImage)
  // General Study Module (through DcmIODImage)
  // General Series Module (through DcmIODImage)
  // Segmentation Series Module
  // Frame of Reference Module (through DcmIODImage)
  // General Equipment Module (through DcmIODImage)
  // Enhanced General Equipment Module (through DcmIODImage)
  // General Image Module (through DcmIODImage)
  // Image Pixel Module (through DcmIODImage)
  // Segmentation Image Module (through this class)
  // Multi-frame Functional Group Module
  // Multi-Frame Dimension Module
  // SOP Common Module (through DcmIODImage)
  // Common Instance Reference Module (through DcmIODImage)

  /// Segmentation Series Module
  IODSegmentationSeriesModule m_SegmentationSeries;

  /// IODEnhancedEquipmentModule
  IODEnhGeneralEquipmentModule m_EnhancedGeneralEquipmentModule;

  /// Multi-frame Functional Groups module
  IODMultiFrameFGModule m_FG;

  /// Multi-frame Dimension Module
  IODMultiframeDimensionModule m_DimensionModule;

  /// Binary frame data
  OFVector<DcmIODTypes::Frame*> m_Frames;

  /* Image level information */

  /// Image Type: (CS, VM 2-n, Type 1), in Segmentations fixed to "DERIVED\PRIMARY"
  const OFString m_ImageType;

  // Instance Number: (IS, VM 1, Type 1)

  /// Content Identification Macro
  ContentIdentificationMacro m_ContentIdentificationMacro;

  /// Segmentation Type: (CS, 1, 1)
  DcmSegTypes::E_SegmentationType m_SegmentationType;

  /// Segmentation Fractional Type: (CS, 1, 1C) (required if FRACTIONAL)
  DcmSegTypes::E_SegmentationFractionalType m_SegmentationFractionalType;

  /// Maximum Fractional Value: (US, 1, 1C) (required if fractional type is FRACTIONAL)
  DcmUnsignedShort m_MaximumFractionalValue;

  /// Segment descriptions from Segment Sequence
  OFVector<DcmSegment*> m_Segments;

  /// Multi-frame Functional Groups high level interface
  FGInterface m_FGInterface;

  // --------------- private helper functions -------------------

  /** Clear old data
   */
  void clearData();

  /** Check the length of the pixel data
   *  @param  pixelData The Pixel Data element
   *  @param  rows Number of rows
   *  @param  cols Number of columns
   *  @param  numberOfFrames Number of frames
   *  @result OFTrue if length is valid, OFFalse otherwise
   */
  OFBool checkPixDataLength(DcmElement* pixelData,
                            const Uint16 rows,
                            const Uint16 cols,
                            const Uint16& numberOfFrames);

  /** Loads file
   *  @param  dcmff The file format to load into
   *  @param  filename The filename of the file to load
   *  @param  dset Pointer to dataset after loading
   *  @return EC_Normal if loading was successful, error otherwise
   */
  static OFCondition loadFile(DcmFileFormat& dcmff,
                              const OFString& filename,
                              DcmDataset*& dset);

  /** Computes the number of total bytes required for the frame data of this
   *  segmentation object. Takes into account dimensions and number of frames,
   *  as well as the type of segmentation (member variables). May file if
   *  size_t type is not able to hold the result of intermediate computations.
   *  @param  rows Number of rows of a frame
   *  @param  cols Number of cols of a frame
   *  @param  numberOfFrames The number of frames of the object
   *  @param  bytesRequired Will hold the result of the computation,
   *          if successful. Does not any padding into account.
   *  @return EC_Normal if computation was possible, EC_TooManyBytesRequested
   *          otherwise.
   */
  OFCondition getTotalBytesRequired(const Uint16& rows,
                                    const Uint16& cols,
                                    const Uint32& numberOfFrames,
                                    size_t& bytesRequired);

  /** Read Fractional Type of segmentation.
   *  @param  item The item to read from
   *  @return EC_Normal if type could be read, EC_TagNotFound if tag is not present,
   *  error otherwise
   */
  OFCondition readSegmentationFractionalType(DcmItem& item);

  /** Read Segmentation Type of segmentation object
   *  @param  item The item to read from
   *  @return EC_Normal if type could be read, EC_TagNotFound if tag is not present,
   *  error otherwise
   */
  OFCondition readSegmentationType(DcmItem& item);

  /** Decompress the given dataset
   *  @param  dset The dataset to be decompressed
   *  @return EC_Normal if decompression worked (or dataset has already been
   *  decompressed), IOD_EC_CannotDecompress otherwise
   */
  static OFCondition decompress(DcmDataset& dset);

};

#endif // SEGDOC_H
