convert LONG RAW to BLOB

Hi
I use Oracle 8i
How to convert LONG RAW to BLOB in PL/SQL code like following

create or raplace function xxx(...) return long raw ...; /
create procedure yyy(...)
is
  l_raw long raw;
  l_blob blob;
begin
...

  l_blob := xxx(...); -- ???
...

  insert into zzz values( ..., l_blob, ...); end;

10x in advance
Nicky

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