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diff --git a/lib/libdvben50221/en50221_app_utils.h b/lib/libdvben50221/en50221_app_utils.h
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+/*
+    en50221 encoder An implementation for libdvb
+    an implementation for the en50221 transport layer
+
+    Copyright (C) 2004, 2005 Manu Abraham <abraham.manu@gmail.com>
+    Copyright (C) 2005 Julian Scheel (julian at jusst dot de)
+    Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net)
+
+    This library is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as
+    published by the Free Software Foundation; either version 2.1 of
+    the License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+*/
+
+#ifndef __EN50221_APP_UTILS_H__
+#define __EN50221_APP_UTILS_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <sys/uio.h>
+
+/**
+ * A decomposed public resource structure.
+ *
+ * we will ignore private resource (resource_id_type==3),
+ * because they are not used by any modules at all and
+ * would need special code for any private resource anyway.
+ */
+struct en50221_app_public_resource_id {
+	uint16_t resource_class;
+	uint16_t resource_type;
+	uint8_t resource_version;
+};
+
+typedef int (*en50221_send_data) (void *arg,
+				  uint16_t session_number,
+				  uint8_t * data,
+				  uint16_t data_length);
+typedef int (*en50221_send_datav) (void *arg,
+				   uint16_t session_number,
+				   struct iovec * vector,
+				   int iov_count);
+
+/**
+ * An abstraction away from hardcoded send functions so different layers may be
+ * slotted in under the application layer.
+ */
+struct en50221_app_send_functions {
+	/**
+	 * Argument to pass to these functions.
+	 */
+	void *arg;
+
+	/**
+	 * Send data.
+	 */
+	en50221_send_data send_data;
+
+	/**
+	 * Send vector data.
+	 */
+	en50221_send_datav send_datav;
+};
+
+/**
+ * Make a host-endian uint32_t formatted resource id.
+ *
+ * @param CLASS Class of resource.
+ * @param TYPE Type of resource.
+ * @param VERSION Version of resource.
+ * @return Formatted resource id.
+ */
+#define MKRID(CLASS, TYPE, VERSION) ((((CLASS)&0xffff)<<16) | (((TYPE)&0x3ff)<<6) | ((VERSION)&0x3f))
+
+/**
+ * Decode a host-endian public resource_id into an en50221_app_public_resource_id structure.
+ *
+ * @param idf Structure to write decoded resource_id into.
+ * @param resource_id ID to decode.
+ * @return Pointer to idf on success, or NULL if this is not a public resource.
+ */
+struct en50221_app_public_resource_id *
+	en50221_app_decode_public_resource_id(struct en50221_app_public_resource_id *idf,
+					      uint32_t resource_id);
+
+/**
+ * Encode an en50221_app_public_resource_id structure into a host-endian uint32_t.
+ *
+ * @param idf Structure to encode.
+ * @return The encoded value
+ */
+static inline uint32_t en50221_app_encode_public_resource_id(struct en50221_app_public_resource_id *idf) {
+	return MKRID(idf->resource_class, idf->resource_type, idf->resource_version);
+}
+
+#ifdef __cplusplus
+}
+#endif
+#endif