add skeleton OER stubs
diff --git a/skeletons/oer_encoder.h b/skeletons/oer_encoder.h
new file mode 100644
index 0000000..ee30f85
--- /dev/null
+++ b/skeletons/oer_encoder.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#ifndef _OER_ENCODER_H_
+#define _OER_ENCODER_H_
+
+#include <asn_application.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct asn_TYPE_descriptor_s; /* Forward declaration */
+
+/*
+ * The Octet Encoding Rules (OER, X.696 08/2015) encoder for any type.
+ * 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 */
+ );
+
+/* 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) */
+ );
+
+/*
+ * 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 */
+ );
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _OER_ENCODER_H_ */