Method ReadHeader

IO/Geometry/vtkOpenFOAMReader.cxx:4490–4561

// Code: vtkFoamIOobject

void vtkFoamIOobject::ReadHeader()
{
  this->Superclass::ReadExpecting("FoamFile");
  this->Superclass::ReadExpecting('{');

  vtkFoamDict headerDict;
  headerDict.SetStreamOption(this->GetStreamOption());
  headerDict.Read(*this, true); // Read as sub-dict. Throw exception in case of error

  const vtkFoamEntry* eptr;

  // Essentials
  if ((eptr = headerDict.Lookup("class")) == nullptr)
  {
    throw vtkFoamError() << "No 'class' in FoamFile header";
  }
  this->headerClassName_ = eptr->ToString();

  if ((eptr = headerDict.Lookup("object")) == nullptr)
  {
    throw vtkFoamError() << "No 'object' in FoamFile header";
  }
  this->objectName_ = eptr->ToString();

  if ((eptr = headerDict.Lookup("format")) == nullptr)
  {
    // Note (2021-03-19): may make this optional in the future, defaulting to ascii
    throw vtkFoamError() << "No 'format' (ascii|binary) in FoamFile header";
  }
  this->SetBinaryFormat("binary" == eptr->ToString()); // case sensitive

  // The arch entry has "label=(32|64) scalar=(32|64)"
  // If missing/incomplete, use fallback values from reader (defined in constructor and Close)
  if ((eptr = headerDict.Lookup("arch")) != nullptr)
  {
    const std::string archValue(eptr->ToString());

    // Match "label=(32|64)"
    {
      auto pos = archValue.find("label=");
      if (pos != std::string::npos)
      {
        pos += 6; // Skip past "label="
        if (archValue.compare(pos, 2, "32") == 0)
        {
          this->SetLabel64(false);
        }
        else if (archValue.compare(pos, 2, "64") == 0)
        {
          this->SetLabel64(true);
        }
      }
    }

    // Match "scalar=(32|64)"
    {
      auto pos = archValue.find("scalar=");
      if (pos != std::string::npos)