X-Git-Url: https://gerrit.o-ran-sc.org/r/gitweb?a=blobdiff_plain;ds=sidebyside;f=e2sm%2Flib%2Fasn_random_fill.c;fp=e2sm%2Flib%2Fasn_random_fill.c;h=2e3e892c103ce9c761fe68c19075995333ddadf1;hb=21b61dd76570beb43afc74289296e831914d9060;hp=0000000000000000000000000000000000000000;hpb=73cdf410d29f46c3047686694e828de4aee6633c;p=ric-app%2Frc.git

diff --git a/e2sm/lib/asn_random_fill.c b/e2sm/lib/asn_random_fill.c
new file mode 100644
index 0000000..2e3e892
--- /dev/null
+++ b/e2sm/lib/asn_random_fill.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2017 Lev Walkin <vlm@lionet.info>.
+ * All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#include <asn_internal.h>
+#include <asn_random_fill.h>
+#include <constr_TYPE.h>
+
+int
+asn_random_fill(const struct asn_TYPE_descriptor_s *td, void **struct_ptr,
+                size_t length) {
+
+    if(td && td->op->random_fill) {
+        asn_random_fill_result_t res =
+            td->op->random_fill(td, struct_ptr, 0, length);
+        return (res.code == ARFILL_OK) ? 0 : -1;
+    } else {
+        return -1;
+    }
+}
+
+static uintmax_t
+asn__intmax_range(intmax_t lb, intmax_t ub) {
+    assert(lb <= ub);
+    if((ub < 0) == (lb < 0)) {
+        return ub - lb;
+    } else if(lb < 0) {
+        return 1 + ((uintmax_t)ub + (uintmax_t)-(lb + 1));
+    } else {
+        assert(!"Unreachable");
+        return 0;
+    }
+}
+
+intmax_t
+asn_random_between(intmax_t lb, intmax_t rb) {
+    if(lb == rb) {
+        return lb;
+    } else {
+        const uintmax_t intmax_max = ((~(uintmax_t)0) >> 1);
+        uintmax_t range = asn__intmax_range(lb, rb);
+        uintmax_t value = 0;
+        uintmax_t got_entropy = 0;
+
+        assert(RAND_MAX > 0xffffff);    /* Seen 7ffffffd! */
+        assert(range < intmax_max);
+
+        for(; got_entropy < range;) {
+            got_entropy = (got_entropy << 24) | 0xffffff;
+#ifdef WIN32
+            value = (value << 24) | (rand() % 0xffffff); //MCHECK:for building on Windows
+#else
+            value = (value << 24) | (random() % 0xffffff); //MCHECK:for building on Linux
+#endif
+        }
+
+        return lb + (intmax_t)(value % (range + 1));
+    }
+}