bool dwgReader21::readDwgBlocks(DRW_Interface& intfa){
    bool ret = true;
    dwgBuffer dataBuf(objData.get(), dataSize, &decoder);
    ret = dwgReader::readDwgBlocks(intfa, &dataBuf);
    return ret;
}
bool dwgReader21::readDwgBlocks(DRW_Interface& intfa){
    bool ret = true;
    dwgBuffer dataBuf(objData.get(), dataSize, &decoder);
    ret = dwgReader::readDwgBlocks(intfa, &dataBuf);
    return ret;
}