+std::string Encode12str(const std::string & src)
+{
+std::string res;
+Encode12str(res, src);
+return res;
+}
+//---------------------------------------------------------------------------
+std::string Decode21str(const std::string & src)
+{
+std::string res;
+Decode21str(res, src);
+return res;
+}
+//---------------------------------------------------------------------------