OrcLib: Utils: add Round.h

Author: fabienfl-orc

src/OrcLib/CMakeLists.txt

@@ -833,6 +833,7 @@ set(SRC_UTILITIES
     "Utils/MakeArray.h"
     "Utils/MetaPtr.h"
     "Utils/Result.h"
+    "Utils/Round.h"
     "Utils/String.cpp"
     "Utils/String.h"
     "Utils/Time.cpp"

src/OrcLib/Utils/Round.h

@@ -0,0 +1,38 @@
+//
+// SPDX-License-Identifier: LGPL-2.1-or-later
+//
+// Copyright © 2023 ANSSI. All Rights Reserved.
+//
+// Author(s): fabienfl (ANSSI)
+//
+#pragma once
+
+#include <type_traits>
+
+namespace Orc {
+
+template <typename T>
+inline std::enable_if_t<std::is_unsigned_v<T>, T> RoundUp(T value, size_t multiple)
+{
+    if (multiple == 0)
+    {
+        return value;
+    }
+
+    const T remainder = value % multiple;
+    if (remainder == 0)
+    {
+        return value;
+    }
+
+    return value + multiple - remainder;
+}
+
+// Faster version for power of 2 multiples
+template <typename T>
+constexpr T RoundUpPow2(T value, size_t multiple)
+{
+    return ((value - 1u) & ~(static_cast<T>(multiple) - 1u)) + multiple;
+}
+
+}  // namespace Orc