BLOB TO CLOB

CREATE OR REPLACE FUNCTION blob_to_clob (blob_in IN BLOB)
RETURN CLOB
AS
	v_clob    CLOB;
	v_varchar VARCHAR2(32767);
	v_start	 PLS_INTEGER := 1;
	v_buffer  PLS_INTEGER := 32767;
BEGIN
	DBMS_LOB.CREATETEMPORARY(v_clob, TRUE);

	FOR i IN 1..CEIL(DBMS_LOB.GETLENGTH(blob_in) / v_buffer)
	LOOP

	   v_varchar := UTL_RAW.CAST_TO_VARCHAR2(DBMS_LOB.SUBSTR(blob_in, v_buffer, v_start));

           DBMS_LOB.WRITEAPPEND(v_clob, LENGTH(v_varchar), v_varchar);

		v_start := v_start + v_buffer;
	END LOOP;

   RETURN v_clob;

END blob_to_clob;
/