Method CheckCFile

IO/Parallel/vtkMultiBlockPLOT3DReaderInternals.cxx:250–329

Unfortunately, a Plot3D file written in C is trickier to check because it has no byte count markers. We need to do a bit more brute force checks based on reading data and estimating file size.

// to do a bit more brute force checks based on reading
// data and estimating file size.
int vtkMultiBlockPLOT3DReaderInternals::CheckCFile(FILE* fp, size_t fileSize)
{
  int precisions[2] = { 4, 8 };
  int blankings[2] = { 0, 1 };
  int dimensions[2] = { 2, 3 };

  clearerr(fp);           // clear error and EOF flags
  fseek(fp, 0, SEEK_SET); // move to beginning
  int gridDims[3];
  if (this->ReadInts(fp, 3, gridDims) != 3)
  {
    return 0;
  }

  // Single grid
  for (int i = 0; i < 2; i++)
  {
    int precision = precisions[i];
    for (int j = 0; j < 2; j++)
    {
      int blanking = blankings[j];
      for (int k = 0; k < 2; k++)
      {
        int dimension = dimensions[k];

        if (fileSize ==
          this->CalculateFileSize(false, precision, blanking, dimension,
            false, // always
            1, gridDims))
        {
          this->Settings.MultiGrid = 0;
          this->Settings.Precision = precision;
          this->Settings.IBlanking = blanking;
          this->Settings.NumberOfDimensions = dimension;
          return 1;
        }
      }
    }
  }

  // Multi grid
  int nGrids;
  clearerr(fp);           // clear error and EOF flags
  fseek(fp, 0, SEEK_SET); // move to beginning
  if (!this->ReadInts(fp, 1, &nGrids))
  {
    return 0;
  }
  std::vector<int> gridDims2(3 * nGrids);
  if (this->ReadInts(fp, nGrids * 3, gridDims2.data()) != nGrids * 3)
  {
    return 0;
  }

  for (int i = 0; i < 2; i++)
  {
    int precision = precisions[i];
    for (int j = 0; j < 2; j++)