code: public int readCall()
          throws IOException
      {
          int tag = read();
  
          if (tag != 'c')
              throw error("expected hessian call ('c') at " + codeName(tag));
  
          int major = read();
          int minor = read();
  
          return (major << 16) + minor;
      }
docs: Starts reading the call
  
  <pre>
  c major minor
  </pre>