Initial community commit

Src/replicant/nu/SafeSize.h

@@ -0,0 +1,51 @@
+#pragma once
+
+class SafeSize
+{
+public:
+	SafeSize()
+	{
+		value = 0;
+		overflow = false;
+	}
+
+	void Add(size_t add)
+	{
+		if (!overflow)
+		{
+			value += add;
+			if (value < add)
+				overflow=true;
+		}
+	}
+
+	void AddN(size_t size, size_t count)
+	{
+		if (!overflow)
+		{
+			size_t total = size * count;
+			if (total < size)
+			{
+				overflow = true;
+			}
+			else
+			{
+				Add(total);
+			}
+		}
+	}
+
+	bool Overflowed() const
+	{
+		return overflow;
+	}
+
+	operator size_t ()
+	{
+		return value;
+	}
+
+private:
+	size_t value;
+	bool overflow;
+};