Minor refactoring, only send joystick data on changes

Src/C64_SDL.h

@@ -616,6 +616,8 @@ void C64::network_vblank()
 		}
 	}
 	else if (this->network_client) {
+		Uint8 js = TheCIA1->Joystick2;
+
 		if (this->quit_thyself)
 		{
 			this->network_client->Disconnect();
@@ -624,10 +626,15 @@ void C64::network_vblank()
 			return;
 		}
 
-		this->network_client->EncodeJoystickUpdate(TheCIA1->Joystick2);
+		/* Perhaps send joystick data */
+		if (this->network_client->cur_joystick_data != js)
+		{
+			this->network_client->EncodeJoystickUpdate(js);
 			this->network_client->SendUpdate();
+			this->network_client->cur_joystick_data = js; 
+		}
 
-		if (this->network_client->ReceiveUpdateBlock())
+		if (this->network_client->ReceiveUpdate())
 		{
 			/* Got something? */
 			if (this->network_client->DecodeUpdate(this->network_client->screen) == true)

Src/Network.cpp

@@ -633,10 +633,8 @@ void NetworkServer::RemoveClient(NetworkClient *client)
 	/* Not found */
 }
 
-NetworkClient::NetworkClient(int sock) : Network()
+void NetworkClient::Init()
 {
-	this->sock = sock;
-
 	this->screen = (Uint8 *)malloc(DISPLAY_X * DISPLAY_Y);
 	assert(this->screen);
 
@@ -644,6 +642,13 @@ NetworkClient::NetworkClient(int sock) : Network()
 	memset(this->screen, 0, DISPLAY_X * DISPLAY_Y);
 }
 
+
+NetworkClient::NetworkClient(int sock)
+{
+	this->Init();
+	this->sock = sock;
+}
+
 NetworkClient::~NetworkClient()
 {
 	free(this->screen);

Src/Network.h

@@ -210,7 +210,10 @@ public:
 
 	Uint8 *screen;
 	int joystick_port;
+	Uint8 cur_joystick_data;
 private:
+	void Init();
+
 	int sock;
 };
 

Src/NetworkUnix.h

@@ -124,6 +124,8 @@ NetworkClient::NetworkClient(const char *hostname, int port)
 	/* Again from glibc docs */
 	struct sockaddr_in servername;
 
+	this->Init();
+
 	/* Create the socket. */
 	this->sock = socket (PF_INET, SOCK_STREAM, 0);
 	if (this->sock < 0)
@@ -142,12 +144,6 @@ NetworkClient::NetworkClient(const char *hostname, int port)
 		perror ("connect (client)");
 		return;
 	}
-
-	this->screen = (Uint8 *)malloc(DISPLAY_X * DISPLAY_Y);
-	assert(this->screen);
-
-	/* Assume black screen */
-	memset(this->screen, 0, DISPLAY_X * DISPLAY_Y);
 }
 
 bool Network::ReceiveData(void *dst, int sock, size_t sz)