Windows: Add function RandinitWithCheck to detect if random generator was already initialized before our call or not

src/Common/Random.c

@@ -94,14 +94,21 @@ HCRYPTPROV hCryptProv;
 
 
 /* Init the random number generator, setup the hooks, and start the thread */
-int Randinit ()
+int RandinitWithCheck ( int* pAlreadyInitialized)
 {
 	DWORD dwLastError = ERROR_SUCCESS;
 	if (GetMaxPkcs5OutSize() > RNG_POOL_SIZE)
 		TC_THROW_FATAL_EXCEPTION;
 
 	if(bRandDidInit)
+	{
+		if (pAlreadyInitialized)
+			*pAlreadyInitialized = 1;
 		return 0;
+	}
+
+	if (pAlreadyInitialized)
+		*pAlreadyInitialized = 0;
 
 	InitializeCriticalSection (&critRandProt);
 
@@ -153,6 +160,11 @@ error:
 	return 1;
 }
 
+int Randinit ()
+{
+	return RandinitWithCheck (NULL);
+}
+
 /* Close everything down, including the thread which is closed down by
    setting a flag which eventually causes the thread function to exit */
 void RandStop (BOOL freePool)

src/Common/Random.h

@@ -35,6 +35,7 @@ extern "C" {
 
 void RandAddInt ( unsigned __int32 x );
 int Randinit ( void );
+int RandinitWithCheck ( int* pAlreadyInitialized);
 void RandStop (BOOL freePool);
 BOOL IsRandomNumberGeneratorStarted ();
 void RandSetHashFunction ( int hash_algo_id );