Tidying up.

helpers.h

@@ -0,0 +1,13 @@
+#ifndef HELPERS_SENTRY
+#define HELPERS_SENTRY
+
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
+
+#define KB(n) (((unsigned long long)(n)) << 10)
+#define MB(n) (((unsigned long long)(n)) << 20)
+#define GB(n) (((unsigned long long)(n)) << 30)
+#define TB(n) (((unsigned long long)(n)) << 40)
+
+#define SWAP(T, a, b) do { T t__ = a; a = b; b = t__; } while(0)
+
+#endif