How to get whether user has ALL permissions on table?

Hi, I have granted ALL permissions on 'techtable' to 'user1'.

techdb=# select pc.relname, pc.relacl from pg_class pc, pg_namespace pn
where pc.relnamespace=pn.oid and pn.nspname='techdb' and
pc.relname='techtable';
relname | relacl
-----------+-------------------------------------------------------------------
techtable | {postgres=arwdDxt/postgres,=ar/postgres,user1=arwdDxt/postgres}
(1 row)

Could anyone please tell me if there is any function or command in
PostGreSql which returns True if given user has ALL permissions on given
table? Is there any alternative way to do this. I have table and user names
and want to know whether user has ALL permissions on table or not.

Thanks,
Ditpi