docs: protected long getCurrentPage() {
          if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled())
              trace.entry(this, cclass
                          , "getCurrentPage"
                              );
  
          long currentPage = sectorValidatedInputStream.currentPage;
  
          if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled())
              trace.exit(this, cclass
                         , "getCurrentPage"
                         , "returns =" + currentPage + "(long)"
                              );
          return currentPage;
      }