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diff --git a/e2sim/e2apv1sim/ricsim/ASN1c/asn_random_fill.h b/e2sim/e2apv1sim/ricsim/ASN1c/asn_random_fill.h
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index 0000000..47f9b8a
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+++ b/e2sim/e2apv1sim/ricsim/ASN1c/asn_random_fill.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#ifndef	ASN_RANDOM_FILL
+#define	ASN_RANDOM_FILL
+
+/* Forward declarations */
+struct asn_TYPE_descriptor_s;
+struct asn_encoding_constraints_s;
+
+/*
+ * Initialize a structure with random data according to the type specification
+ * and optional member constraints.
+ * ARGUMENTS:
+ *  (max_length)        - See (approx_max_length_limit).
+ *  (memb_constraints)  - Member constraints, if exist.
+ *                        The type can be constrained differently according
+ *                        to PER and OER specifications, so we find a value
+ *                        at the intersection of these constraints.
+ * In case the return differs from ARFILL_OK, the (struct_ptr) contents
+ * and (current_length) value remain in their original state.
+ */
+typedef struct asn_random_fill_result_s {
+    enum {
+        ARFILL_FAILED = -1, /* System error (memory?) */
+        ARFILL_OK = 0,      /* Initialization succeeded */
+        ARFILL_SKIPPED = 1  /* Not done due to (length?) constraint */
+    } code;
+    size_t length; /* Approximate number of bytes created. */
+} asn_random_fill_result_t;
+typedef asn_random_fill_result_t(asn_random_fill_f)(
+    const struct asn_TYPE_descriptor_s *td, void **struct_ptr,
+    const struct asn_encoding_constraints_s *memb_constraints,
+    size_t max_length);
+
+/*
+ * Returns 0 if the structure was properly initialized, -1 otherwise.
+ * The (approx_max_length_limit) specifies the approximate limit of the
+ * resulting structure in units closely resembling bytes. The actual result
+ * might be several times larger or smaller than the length limit.
+ */
+int asn_random_fill(const struct asn_TYPE_descriptor_s *td, void **struct_ptr,
+                    size_t approx_max_length_limit);
+
+/*
+ * Returns a random number between min and max.
+ */
+intmax_t asn_random_between(intmax_t min, intmax_t max);
+
+#endif	/* ASN_RANDOM_FILL */