-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;
-}
-//---------------------------------------------------------------------------