itkOFFMeshIO.h

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/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/

#ifndef itkOFFMeshIO_h
#define itkOFFMeshIO_h
#include "ITKIOMeshOFFExport.h"

#include "itkMeshIOBase.h"

#include <fstream>

namespace itk
{
class ITKIOMeshOFF_EXPORT OFFMeshIO:public MeshIOBase
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(OFFMeshIO);

  using Self = OFFMeshIO;
  using Superclass = MeshIOBase;
  using ConstPointer = SmartPointer< const Self >;
  using Pointer = SmartPointer< Self >;

  using SizeValueType = Superclass::SizeValueType;
  using StreamOffsetType = Superclass::StreamOffsetType;

  itkNewMacro(Self);

  itkTypeMacro(OFFMeshIO, MeshIOBase);

  /*-------- This part of the interfaces deals with reading data. ----- */

  bool CanReadFile(const char *FileNameToRead) override;

  void ReadMeshInformation() override;

  void ReadPoints(void *buffer) override;

  void ReadCells(void *buffer) override;

  void ReadPointData(void *buffer) override;

  void ReadCellData(void *buffer) override;

  /*-------- This part of the interfaces deals with writing data. ----- */

  bool CanWriteFile(const char *FileNameToWrite) override;

  void WriteMeshInformation() override;

  void WritePoints(void *buffer) override;

  void WriteCells(void *buffer) override;

  void WritePointData(void *buffer) override;

  void WriteCellData(void *buffer) override;

  void Write() override;

protected:
  template< typename T >
  void ReadCellsBufferAsAscii(T *buffer, std::ifstream & inputFile)
    {
    SizeValueType index = 0;
    unsigned int numberOfPoints = 0;
    std::string  line;

    for ( SizeValueType ii = 0; ii < this->m_NumberOfCells; ii++ )
      {
      inputFile >> numberOfPoints;
      buffer[index++] = static_cast< T >( numberOfPoints );
      for ( unsigned int jj = 0; jj < numberOfPoints; jj++ )
        {
        inputFile >> buffer[index++];
        }
      std::getline(inputFile, line, '\n');
      }
    }

  template< typename TInput, typename TOutput >
  void ReadCellsBuffer(TInput *input, TOutput *output)
    {
    if ( input && output )
      {
      SizeValueType indInput  = 0;
      SizeValueType indOutput = 0;
      for ( SizeValueType ii = 0; ii < this->m_NumberOfCells; ii++ )
        {
        indInput++; // ignore the cell type
        auto numberOfPoints = static_cast< unsigned int >( input[indInput++] );
        output[indOutput++] = static_cast< TOutput >( numberOfPoints );
        for ( unsigned int jj = 0; jj < numberOfPoints; jj++ )
          {
          output[indOutput++] = static_cast< TOutput >( input[indInput++] );
          }
        }
      }
    }

  template< typename T >
  void WriteCellsAsAscii(T *buffer, std::ofstream & outputFile)
    {
    SizeValueType index = 0;

    for ( SizeValueType ii = 0; ii < this->m_NumberOfCells; ii++ )
      {
      index++;
      auto numberOfCellPoints = static_cast< unsigned int >( buffer[index++] );
      outputFile << numberOfCellPoints << "  ";

      for ( unsigned int jj = 0; jj < numberOfCellPoints; jj++ )
        {
        outputFile << buffer[index++] << "  ";
        }

      outputFile << '\n';
      }
    }

  template< typename TOutput, typename TInput >
  void WriteCellsAsBinary(TInput *buffer, std::ofstream & outputFile)
    {
    auto * data = new TOutput[m_CellBufferSize - this->m_NumberOfCells];

    ReadCellsBuffer(buffer, data);
    WriteBufferAsBinary< TOutput >(data, outputFile, m_CellBufferSize - this->m_NumberOfCells);

    delete[] data;
    }

protected:
  OFFMeshIO();
  ~OFFMeshIO() override;

  void PrintSelf(std::ostream & os, Indent indent) const override;

  void OpenFile();

  void CloseFile();

private:
  std::ifstream    m_InputFile;
  StreamOffsetType m_PointsStartPosition; // file position for points rlative to std::ios::beg
  bool             m_TriangleCellType;    // if all cells are trinalge it is true. otherwise, it is false.
};
} // end namespace itk

#endif