extended bio_reader and bio_writer to handle u_int64_t

src/libstrongswan/bio/bio_writer.h

@@ -58,6 +58,13 @@ struct bio_writer_t {
 	 */
 	void (*write_uint32)(bio_writer_t *this, u_int32_t value);
 
+	/**
+	 * Append a 64-bit integer to the buffer.
+	 *
+	 * @param value		value to append
+	 */
+	void (*write_uint64)(bio_writer_t *this, u_int64_t value);
+
 	/**
 	 * Append a chunk of data without a length header.
 	 *