Converting Wire Protocol from Oracle to Postgres and Vice-Versa

Naive Question Assume we have an Application which was originally written for ORACLE as DBMS. If I want write an intermediary layer that gives this application independence to be able to work with PostgreSQL DBMS - I presume that I would be required to perform the following : SQL : Application--> ODBC API (Oracle Wire Protocol) --> My Layer ---> ODBC API (PostgreSQL Wire Protocol) Response : Application-->ODBC API (Oracle Wire Protocol) ODBC API (PostgreSQL Wire Protocol) ----> PostgreSQL DBMS Response : Application-->ODBC API (PostgreSQL Wire Protocol) <---- PostgreSQL DBMS