Added a timeout on wrong password.

helpers.h

@@ -1,13 +1,34 @@
 #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 ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
+
+#define MIN(a,b) (((a)<(b))?(a):(b))
+#define MAX(a,b) (((a)>(b))?(a):(b))
+
 #define SWAP(T, a, b) do { T t__ = a; a = b; b = t__; } while(0)
 
+#define PI      3.1415926535897f
+#define EPSILON 4.94065645841247e-324
+
+#define MAX_U64 (unsigned long long)0xffffffffffffffffull
+#define MAX_U32       (unsigned int)0xffffffff
+#define MAX_U16     (unsigned short)0xffff
+#define MAX_U8       (unsigned char)0xff
+
+#define MAX_S64   (long long)0x7fffffffffffffffll
+#define MAX_S32         (int)0x7fffffff
+#define MAX_S16       (short)0x7fff
+#define MAX_S8  (signed char)0x7f
+
+#define MIN_S64   (long long)0x8000000000000000ll
+#define MIN_S32         (int)0x80000000
+#define MIN_S16       (short)0x8000
+#define MIN_S8  (signed char)0x80
+
 #endif