Method ReadArray

IO/Legacy/vtkDataReader.cxx:1543–2088

------------------------------------------------------------------------------ Description: Read data array. Return pointer to array object if successful read; otherwise return nullptr. Note: this method instantiates a reference counted object with initial count of one; proper protocol is for you to assign the data object and then invoke Delete() it to restore proper reference count.

// the data object and then invoke Delete() it to restore proper reference
// count.
vtkAbstractArray* vtkDataReader::ReadArray(
  const char* dataType, vtkIdType numTuples, vtkIdType numComp)
{
  char* type = strdup(dataType);
  type = this->LowerCase(type);

  vtkAbstractArray* array;
  if (!strncmp(type, "bit", 3))
  {
    array = vtkBitArray::New();
    array->SetNumberOfComponents(numComp);
    if (numTuples != 0 && numComp != 0)
    {
      unsigned char* ptr = ((vtkBitArray*)array)->WritePointer(0, numTuples * numComp);
      if (this->FileType == VTK_BINARY)
      {
        char line[256];
        this->IS->getline(line, 256);
        this->IS->read((char*)ptr, sizeof(unsigned char) * (numTuples * numComp + 7) / 8);
        if (this->IS->eof())
        {
          vtkErrorMacro(<< "Error reading binary bit array!");
          free(type);
          array->Delete();
          return nullptr;
        }
      }
      else
      {
        vtkIdType b;
        for (vtkIdType i = 0; i < numTuples; i++)
        {
          for (vtkIdType j = 0; j < numComp; j++)
          {
            if (!this->Read(&b))
            {
              vtkErrorMacro("Error reading ascii bit array! tuple: " << i << ", component: " << j);
              free(type);
              array->Delete();
              return nullptr;
            }
            else
            {
              ((vtkBitArray*)array)->SetValue(i * numComp + j, b);
            }
          }
        }
      }
    }
  }

  else if (!strcmp(type, "char") || !strcmp(type, "signed_char"))
  {
    array = vtkCharArray::New();
    array->SetNumberOfComponents(numComp);
    char* ptr = ((vtkCharArray*)array)->WritePointer(0, numTuples * numComp);
    if (this->FileType == VTK_BINARY)
    {