Simplify the logic of accessing codec function for specific TYPE
diff --git a/skeletons/IA5String.h b/skeletons/IA5String.h
index e2a909d..6f53dc8 100644
--- a/skeletons/IA5String.h
+++ b/skeletons/IA5String.h
@@ -20,6 +20,15 @@
 
 asn_constr_check_f IA5String_constraint;
 
+#define IA5String_free           OCTET_STRING_free
+#define IA5String_print          OCTET_STRING_print_utf8
+#define IA5String_decode_ber     OCTET_STRING_decode_ber
+#define IA5String_encode_der     OCTET_STRING_encode_der
+#define IA5String_decode_xer     OCTET_STRING_decode_xer_utf8
+#define IA5String_encode_xer     OCTET_STRING_encode_xer_utf8
+#define IA5String_decode_uper    OCTET_STRING_decode_uper
+#define IA5String_encode_uper    OCTET_STRING_encode_uper
+
 #ifdef __cplusplus
 }
 #endif