Method ReadHeaderInternal

IO/Image/vtkNrrdReader.cxx:266–306

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
int vtkNrrdReader::ReadHeaderInternal(vtkCharArray* headerBuffer)
{
  if (!this->FileName)
  {
    vtkErrorMacro(<< "No filename set.");
    return 0;
  }

  vtksys::ifstream file(this->FileName, ios::in | ios::binary);
  // Read in 4 MB.  Assuming that the header will be smaller than that.
  headerBuffer->SetNumberOfTuples(0x400000);
  file.read(headerBuffer->GetPointer(0), 0x400000 - 1);
  vtkIdType buffersize = file.gcount();
  headerBuffer->SetValue(buffersize, '\0');
  headerBuffer->SetNumberOfTuples(buffersize + 1);

  // Find a blank line (which signals the end of the header).  Be careful
  // because line endings can be "\n", "\r\n", or both.  It is possible that
  // the entire file is the header (happens with "detached headers").
  char* bufferStart = headerBuffer->GetPointer(0);
  char* s = bufferStart;
  while ((s = strchr(s + 1, '\n')) != nullptr)
  {
    // If you find a double line ending, terminate the string and shorten the
    // buffer.
    if (s[1] == '\n')
    {
      s[2] = '\0';
      headerBuffer->SetNumberOfTuples(static_cast<vtkIdType>(s + 3 - bufferStart));
      break;
    }
    if ((s[1] == '\r') && (s[2] == '\n'))
    {
      s[3] = '\0';
      headerBuffer->SetNumberOfTuples(static_cast<vtkIdType>(s + 4 - bufferStart));
      break;
    }
  }

  return 1;
}

//------------------------------------------------------------------------------
int vtkNrrdReader::ReadHeader()