From 2689f2cc4ae188a5fa3f5b65208798f516653949 Mon Sep 17 00:00:00 2001
From: Brad Davis <bdavis@saintandreas.org>
Date: Tue, 19 Apr 2016 13:38:27 -0700
Subject: [PATCH] Add MB/KB/Byte conversion macros

---
 libraries/shared/src/NumericalConstants.h |  9 +++++++
 libraries/shared/src/shared/OnceEvery.h   | 33 +++++++++++++++++++++++
 2 files changed, 42 insertions(+)
 create mode 100644 libraries/shared/src/shared/OnceEvery.h

diff --git a/libraries/shared/src/NumericalConstants.h b/libraries/shared/src/NumericalConstants.h
index 6b37031d23..cf78f6dbf3 100644
--- a/libraries/shared/src/NumericalConstants.h
+++ b/libraries/shared/src/NumericalConstants.h
@@ -44,4 +44,13 @@ const int BYTES_PER_KILOBYTE = 1000;
 const int BYTES_PER_KILOBIT = BYTES_PER_KILOBYTE / BITS_IN_BYTE;
 const int KILO_PER_MEGA = 1000;
 
+#define KB_TO_BYTES_SHIFT 10
+#define MB_TO_BYTES_SHIFT 20
+
+#define MB_TO_BYTES(X) ((size_t)(X) << MB_TO_BYTES_SHIFT)
+#define KB_TO_BYTES(X) ((size_t)(X) << KB_TO_BYTES_SHIFT)
+
+#define BYTES_TO_MB(X) (X >> MB_TO_BYTES_SHIFT)
+#define BYTES_TO_KB(X) (X >> KB_TO_BYTES_SHIFT)
+
 #endif // hifi_NumericalConstants_h
diff --git a/libraries/shared/src/shared/OnceEvery.h b/libraries/shared/src/shared/OnceEvery.h
new file mode 100644
index 0000000000..36531413ec
--- /dev/null
+++ b/libraries/shared/src/shared/OnceEvery.h
@@ -0,0 +1,33 @@
+//
+//  Created by Bradley Austin Davis on 2016/04/19
+//  Copyright 2015 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#include <stdint.h>
+#include <functional>
+
+#include "../SharedUtil.h"
+#include "../NumericalConstants.h"
+
+template <size_t MS = 1000>
+class OnceEvery {
+public:
+    OnceEvery(std::function<void()> f) : _f(f) { }
+
+    bool maybeExecute() {
+        uint64_t now = usecTimestampNow();
+        if ((now - _lastRun) > (MS * USECS_PER_MSEC)) {
+            _f();
+            _lastRun = now;
+            return true;
+        }
+        return false;
+    }
+
+private:
+    uint64_t _lastRun { 0 };
+    std::function<void()> _f;
+};