Adding upstream version 2.4.1.upstream/2.4.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 61 insertions, 0 deletions

diff --git a/src/lib/util/range_utilities.h b/src/lib/util/range_utilities.h
new file mode 100644
index 0000000..a14b677
--- /dev/null
+++ b/src/lib/util/range_utilities.h
@@ -0,0 +1,61 @@
+// Copyright (C) 2012-2019,2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef RANGE_UTIL_H
+#define RANGE_UTIL_H 1
+
+#include <stdlib.h>
+#include <algorithm>
+#include <functional>
+
+// This header contains useful methods for conduction operations on
+// a range of container elements. Currently the collection is limited,
+// but it is expected to grow.
+
+namespace isc {
+namespace util {
+
+/// @brief Checks if specified range in a container contains only zeros
+///
+/// @param begin beginning of the range
+/// @param end end of the range
+///
+/// @return true if there are only zeroes, false otherwise
+template <typename Iterator>
+bool
+isRangeZero(Iterator begin, Iterator end) {
+    return (std::find_if(begin, end, [] (int x) { return (0 != x); })
+            == end);
+}
+
+/// @brief Fill in specified range with a random data.
+///
+/// Make sure that random number generator is initialized
+/// properly. Otherwise you will get the same pseudo-random sequence
+/// after every start of your process.  Calling srand() is enough. This
+/// method uses default rand(), which is usually a LCG pseudo-random
+/// number generator, so it is not suitable for security
+/// purposes. Please use cryptolink RNG if you are doing anything
+/// related with security.
+///
+/// PRNG initialization is left out of this function on purpose. It may
+/// be initialized to specific value on purpose, e.g. to repeat exactly
+/// the same sequence in a test.
+///
+/// @param begin
+/// @param end
+template <typename Iterator>
+void
+fillRandom(Iterator begin, Iterator end) {
+    for (Iterator x = begin; x != end; ++x) {
+        *x = random();
+    }
+}
+
+} // end of isc::util namespace
+} // end of isc namespace
+
+#endif  // RANGE_UTIL_H