How can I encode a RowDescription and DataRow for postgres binary protocol?

[jsoneaday]

I've been looking through the sqlx source code and can see that there is a PgRecordDecoder that seems to handle any type, but the PgRecordEncoder is specific to PgArgumentBuffer.

Is there any code, or can someone help guide me, as to how to create an encoder for a RowDescription and DataRow? I would like to modify a DataRow after it comes back from the db and then send it to client caller.