Problem in the External Function returned data RAW

Hi,
I have a problem, I would want to create an external function in Oracle 10g, than given in input a data RAW it gives back in output the value in format raw.
I have realized such function through language C.
these are the prototypes of the function
ORACLE side:
CREATE OR REPLACE FUNCTION F_RETURN_RAW (inputText IN RAW)
RETURN RAW -- I do not know to return RAW !!!
AS LANGUAGE C
NAME "f_Return_Raw"
LIBRARY C_Library_DAN
PARAMETERS
(inputText RAW,
inputText INDICATOR,
inputText LENGTH);
C side:
???? f_Return_Raw(CK_BYTE_PTR in_Text,
short *in_TextInd,
int *in_TextLen)
I do not know what to put in place of ????
someone can help me with some example?
thanks to all!
Regards
Daniele

Hello I had already seen the package UTL_RAW,
in particular is CAST_TO_VARCHAR2 that CAST_TO_RAW,
but these me are useful Oracle side,
my problem are to give back to Oracle, from side C, one RAW.
Perhaps it is not possible to give back a RAW directly?
or I have more probably not understood your suggestion!
I would want to create a function that he concurred me to make that
insert into table_example values(f_Return_Raw(RAW_INPUT))
that the function gives back RAW directly
Regards
Daniele

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