add OER encoder helpers
diff --git a/skeletons/oer_encoder.h b/skeletons/oer_encoder.h
index ee30f85..67bc47e 100644
--- a/skeletons/oer_encoder.h
+++ b/skeletons/oer_encoder.h
@@ -18,28 +18,29 @@
  * This function may be invoked directly by the application.
  */
 asn_enc_rval_t oer_encode(struct asn_TYPE_descriptor_s *type_descriptor,
-		void *struct_ptr,	/* Structure to be encoded */
-		asn_app_consume_bytes_f *consume_bytes_cb,
-		void *app_key		/* Arbitrary callback argument */
-	);
+                          void *struct_ptr, /* Structure to be encoded */
+                          asn_app_consume_bytes_f *consume_bytes_cb,
+                          void *app_key /* Arbitrary callback argument */
+                          );
 
 /* A variant of oer_encode() which encodes data into the pre-allocated buffer */
 asn_enc_rval_t oer_encode_to_buffer(
-		struct asn_TYPE_descriptor_s *type_descriptor,
-		void *struct_ptr,	/* Structure to be encoded */
-		void *buffer,		/* Pre-allocated buffer */
-		size_t buffer_size	/* Initial buffer size (maximum) */
-	);
+    struct asn_TYPE_descriptor_s *type_descriptor,
+    void *struct_ptr,  /* Structure to be encoded */
+    void *buffer,      /* Pre-allocated buffer */
+    size_t buffer_size /* Initial buffer size (maximum) */
+    );
 
 /*
  * Type of the generic OER encoder.
  */
-typedef asn_enc_rval_t (oer_type_encoder_f)(
-		struct asn_TYPE_descriptor_s *type_descriptor,
-		void *struct_ptr,	/* Structure to be encoded */
-		asn_app_consume_bytes_f *consume_bytes_cb,	/* Callback */
-		void *app_key		/* Arbitrary callback argument */
-	);
+typedef asn_enc_rval_t(oer_type_encoder_f)(
+    struct asn_TYPE_descriptor_s *type_descriptor,
+    asn_oer_constraints_t *constraints,
+    void *struct_ptr,                          /* Structure to be encoded */
+    asn_app_consume_bytes_f *consume_bytes_cb, /* Callback */
+    void *app_key                              /* Arbitrary callback argument */
+    );
 
 
 #ifdef __cplusplus