Nymi NclProvision to and from NSData

gistfile1.txt

// AppDelegate didFinishLaunching...

        NSDictionary *appDefaults = [NSDictionary dictionaryWithObject:[NSData dataWithBytes:nil length:0]
                                                                forKey:@"NymiProvision"];
        [[NSUserDefaults standardUserDefaults] registerDefaults:appDefaults];

// ViewController viewDidLoad...

        //
        // Save and load a provision on the obj-c side of things
        //
        NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
        NSData *savedProvision = [userDefaults dataForKey:@"NymiProvision"];
        if (savedProvision != nil && [savedProvision length] > 0) {
            NclProvision provision;
            [savedProvision getBytes:&provision length:sizeof(provision)];
            self->provisions.push_back(provision);
        }

// ViewController ncl callback

		case NCL_EVENT_PROVISION:{
			//remember the provision
			v->provisions.push_back(event.provision.provision);

                        //
                        // Store in user defaults
                        //
                        NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
                        NclProvision provision = event.provision.provision;
                        NSData *savedProvision = [NSData dataWithBytes:&provision
                                                                length:sizeof(provision)];
                        [userDefaults setObject:savedProvision forKey:@"NymiProvision"];