Simplify the logic of accessing codec function for specific TYPE
diff --git a/tests/127-per-long-OK.asn1.-Pgen-PER b/tests/127-per-long-OK.asn1.-Pgen-PER
index 8334d94..f9d3c80 100644
--- a/tests/127-per-long-OK.asn1.-Pgen-PER
+++ b/tests/127-per-long-OK.asn1.-Pgen-PER
@@ -44,87 +44,6 @@
  * This type is implemented using NativeInteger,
  * so here we adjust the DEF accordingly.
  */
-static void
-unsigned32_4_inherit_TYPE_descriptor(asn_TYPE_descriptor_t *td) {
-	td->free_struct    = asn_DEF_NativeInteger.free_struct;
-	td->print_struct   = asn_DEF_NativeInteger.print_struct;
-	td->check_constraints = asn_DEF_NativeInteger.check_constraints;
-	td->ber_decoder    = asn_DEF_NativeInteger.ber_decoder;
-	td->der_encoder    = asn_DEF_NativeInteger.der_encoder;
-	td->xer_decoder    = asn_DEF_NativeInteger.xer_decoder;
-	td->xer_encoder    = asn_DEF_NativeInteger.xer_encoder;
-	td->uper_decoder   = asn_DEF_NativeInteger.uper_decoder;
-	td->uper_encoder   = asn_DEF_NativeInteger.uper_encoder;
-	td->oer_decoder    = asn_DEF_NativeInteger.oer_decoder;
-	td->oer_encoder    = asn_DEF_NativeInteger.oer_encoder;
-	if(!td->oer_constraints)
-		td->oer_constraints = asn_DEF_NativeInteger.oer_constraints;
-	if(!td->per_constraints)
-		td->per_constraints = asn_DEF_NativeInteger.per_constraints;
-	td->elements       = asn_DEF_NativeInteger.elements;
-	td->elements_count = asn_DEF_NativeInteger.elements_count;
-     /* td->specifics      = asn_DEF_NativeInteger.specifics;	// Defined explicitly */
-}
-
-static void
-unsigned32_4_free(asn_TYPE_descriptor_t *td,
-		void *struct_ptr, int contents_only) {
-	unsigned32_4_inherit_TYPE_descriptor(td);
-	td->free_struct(td, struct_ptr, contents_only);
-}
-
-static int
-unsigned32_4_print(asn_TYPE_descriptor_t *td, const void *struct_ptr,
-		int ilevel, asn_app_consume_bytes_f *cb, void *app_key) {
-	unsigned32_4_inherit_TYPE_descriptor(td);
-	return td->print_struct(td, struct_ptr, ilevel, cb, app_key);
-}
-
-static asn_dec_rval_t
-unsigned32_4_decode_ber(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
-		void **structure, const void *bufptr, size_t size, int tag_mode) {
-	unsigned32_4_inherit_TYPE_descriptor(td);
-	return td->ber_decoder(opt_codec_ctx, td, structure, bufptr, size, tag_mode);
-}
-
-static asn_enc_rval_t
-unsigned32_4_encode_der(asn_TYPE_descriptor_t *td,
-		void *structure, int tag_mode, ber_tlv_tag_t tag,
-		asn_app_consume_bytes_f *cb, void *app_key) {
-	unsigned32_4_inherit_TYPE_descriptor(td);
-	return td->der_encoder(td, structure, tag_mode, tag, cb, app_key);
-}
-
-static asn_dec_rval_t
-unsigned32_4_decode_xer(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
-		void **structure, const char *opt_mname, const void *bufptr, size_t size) {
-	unsigned32_4_inherit_TYPE_descriptor(td);
-	return td->xer_decoder(opt_codec_ctx, td, structure, opt_mname, bufptr, size);
-}
-
-static asn_enc_rval_t
-unsigned32_4_encode_xer(asn_TYPE_descriptor_t *td, void *structure,
-		int ilevel, enum xer_encoder_flags_e flags,
-		asn_app_consume_bytes_f *cb, void *app_key) {
-	unsigned32_4_inherit_TYPE_descriptor(td);
-	return td->xer_encoder(td, structure, ilevel, flags, cb, app_key);
-}
-
-static asn_dec_rval_t
-unsigned32_4_decode_uper(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
-		asn_per_constraints_t *constraints, void **structure, asn_per_data_t *per_data) {
-	unsigned32_4_inherit_TYPE_descriptor(td);
-	return td->uper_decoder(opt_codec_ctx, td, constraints, structure, per_data);
-}
-
-static asn_enc_rval_t
-unsigned32_4_encode_uper(asn_TYPE_descriptor_t *td,
-		asn_per_constraints_t *constraints,
-		void *structure, asn_per_outp_t *per_out) {
-	unsigned32_4_inherit_TYPE_descriptor(td);
-	return td->uper_encoder(td, constraints, structure, per_out);
-}
-
 static int
 unsplit32_5_constraint(asn_TYPE_descriptor_t *td, const void *sptr,
 			asn_app_constraint_failed_f *ctfailcb, void *app_key) {
@@ -154,87 +73,6 @@
  * This type is implemented using NativeInteger,
  * so here we adjust the DEF accordingly.
  */
-static void
-unsplit32_5_inherit_TYPE_descriptor(asn_TYPE_descriptor_t *td) {
-	td->free_struct    = asn_DEF_NativeInteger.free_struct;
-	td->print_struct   = asn_DEF_NativeInteger.print_struct;
-	td->check_constraints = asn_DEF_NativeInteger.check_constraints;
-	td->ber_decoder    = asn_DEF_NativeInteger.ber_decoder;
-	td->der_encoder    = asn_DEF_NativeInteger.der_encoder;
-	td->xer_decoder    = asn_DEF_NativeInteger.xer_decoder;
-	td->xer_encoder    = asn_DEF_NativeInteger.xer_encoder;
-	td->uper_decoder   = asn_DEF_NativeInteger.uper_decoder;
-	td->uper_encoder   = asn_DEF_NativeInteger.uper_encoder;
-	td->oer_decoder    = asn_DEF_NativeInteger.oer_decoder;
-	td->oer_encoder    = asn_DEF_NativeInteger.oer_encoder;
-	if(!td->oer_constraints)
-		td->oer_constraints = asn_DEF_NativeInteger.oer_constraints;
-	if(!td->per_constraints)
-		td->per_constraints = asn_DEF_NativeInteger.per_constraints;
-	td->elements       = asn_DEF_NativeInteger.elements;
-	td->elements_count = asn_DEF_NativeInteger.elements_count;
-     /* td->specifics      = asn_DEF_NativeInteger.specifics;	// Defined explicitly */
-}
-
-static void
-unsplit32_5_free(asn_TYPE_descriptor_t *td,
-		void *struct_ptr, int contents_only) {
-	unsplit32_5_inherit_TYPE_descriptor(td);
-	td->free_struct(td, struct_ptr, contents_only);
-}
-
-static int
-unsplit32_5_print(asn_TYPE_descriptor_t *td, const void *struct_ptr,
-		int ilevel, asn_app_consume_bytes_f *cb, void *app_key) {
-	unsplit32_5_inherit_TYPE_descriptor(td);
-	return td->print_struct(td, struct_ptr, ilevel, cb, app_key);
-}
-
-static asn_dec_rval_t
-unsplit32_5_decode_ber(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
-		void **structure, const void *bufptr, size_t size, int tag_mode) {
-	unsplit32_5_inherit_TYPE_descriptor(td);
-	return td->ber_decoder(opt_codec_ctx, td, structure, bufptr, size, tag_mode);
-}
-
-static asn_enc_rval_t
-unsplit32_5_encode_der(asn_TYPE_descriptor_t *td,
-		void *structure, int tag_mode, ber_tlv_tag_t tag,
-		asn_app_consume_bytes_f *cb, void *app_key) {
-	unsplit32_5_inherit_TYPE_descriptor(td);
-	return td->der_encoder(td, structure, tag_mode, tag, cb, app_key);
-}
-
-static asn_dec_rval_t
-unsplit32_5_decode_xer(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
-		void **structure, const char *opt_mname, const void *bufptr, size_t size) {
-	unsplit32_5_inherit_TYPE_descriptor(td);
-	return td->xer_decoder(opt_codec_ctx, td, structure, opt_mname, bufptr, size);
-}
-
-static asn_enc_rval_t
-unsplit32_5_encode_xer(asn_TYPE_descriptor_t *td, void *structure,
-		int ilevel, enum xer_encoder_flags_e flags,
-		asn_app_consume_bytes_f *cb, void *app_key) {
-	unsplit32_5_inherit_TYPE_descriptor(td);
-	return td->xer_encoder(td, structure, ilevel, flags, cb, app_key);
-}
-
-static asn_dec_rval_t
-unsplit32_5_decode_uper(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
-		asn_per_constraints_t *constraints, void **structure, asn_per_data_t *per_data) {
-	unsplit32_5_inherit_TYPE_descriptor(td);
-	return td->uper_decoder(opt_codec_ctx, td, constraints, structure, per_data);
-}
-
-static asn_enc_rval_t
-unsplit32_5_encode_uper(asn_TYPE_descriptor_t *td,
-		asn_per_constraints_t *constraints,
-		void *structure, asn_per_outp_t *per_out) {
-	unsplit32_5_inherit_TYPE_descriptor(td);
-	return td->uper_encoder(td, constraints, structure, per_out);
-}
-
 static int
 memb_small32range_constraint_1(asn_TYPE_descriptor_t *td, const void *sptr,
 			asn_app_constraint_failed_f *ctfailcb, void *app_key) {
@@ -362,7 +200,7 @@
 
 /*** <<< STAT-DEFS [T] >>> ***/
 
-static asn_INTEGER_specifics_t asn_SPC_unsigned32_specs_4 = {
+static const asn_INTEGER_specifics_t asn_SPC_unsigned32_specs_4 = {
 	0,	0,	0,	0,	0,
 	0,	/* Native long size */
 	1	/* Unsigned representation */
@@ -375,16 +213,16 @@
 asn_TYPE_descriptor_t asn_DEF_unsigned32_4 = {
 	"unsigned32",
 	"unsigned32",
-	unsigned32_4_free,
-	unsigned32_4_print,
+	NativeInteger_free,
+	NativeInteger_print,
 	unsigned32_4_constraint,
-	unsigned32_4_decode_ber,
-	unsigned32_4_encode_der,
-	unsigned32_4_decode_xer,
-	unsigned32_4_encode_xer,
+	NativeInteger_decode_ber,
+	NativeInteger_encode_der,
+	NativeInteger_decode_xer,
+	NativeInteger_encode_xer,
 	0, 0,	/* No OER support, use "-gen-OER" to enable */
-	unsigned32_4_decode_uper,
-	unsigned32_4_encode_uper,
+	NativeInteger_decode_uper,
+	NativeInteger_encode_uper,
 	0,	/* Use generic outmost tag fetcher */
 	asn_DEF_unsigned32_tags_4,
 	sizeof(asn_DEF_unsigned32_tags_4)
@@ -398,7 +236,7 @@
 	&asn_SPC_unsigned32_specs_4	/* Additional specs */
 };
 
-static asn_INTEGER_specifics_t asn_SPC_unsplit32_specs_5 = {
+static const asn_INTEGER_specifics_t asn_SPC_unsplit32_specs_5 = {
 	0,	0,	0,	0,	0,
 	0,	/* Native long size */
 	1	/* Unsigned representation */
@@ -411,16 +249,16 @@
 asn_TYPE_descriptor_t asn_DEF_unsplit32_5 = {
 	"unsplit32",
 	"unsplit32",
-	unsplit32_5_free,
-	unsplit32_5_print,
+	NativeInteger_free,
+	NativeInteger_print,
 	unsplit32_5_constraint,
-	unsplit32_5_decode_ber,
-	unsplit32_5_encode_der,
-	unsplit32_5_decode_xer,
-	unsplit32_5_encode_xer,
+	NativeInteger_decode_ber,
+	NativeInteger_encode_der,
+	NativeInteger_decode_xer,
+	NativeInteger_encode_xer,
 	0, 0,	/* No OER support, use "-gen-OER" to enable */
-	unsplit32_5_decode_uper,
-	unsplit32_5_encode_uper,
+	NativeInteger_decode_uper,
+	NativeInteger_encode_uper,
 	0,	/* Use generic outmost tag fetcher */
 	asn_DEF_unsplit32_tags_5,
 	sizeof(asn_DEF_unsplit32_tags_5)