secure coding

secure_coding.m

typedef NS_ENUM(int32_t, CFGGame) {
	CFGGameWinter,
	CFGGameSummer,
	CFGGameVivaldi
};

@interface Person : NSObject <NSSecureCoding>

@property int32_t        cfgVersion;
@property (retain, nonatomic) NSDictionary  *cfgReserved;
@property CFGGame        cfgGame;
@property (retain, nonatomic) NSDate   *cfgDate;
@property (retain, nonatomic) NSURL    *cfgMovie;
@property (retain, nonatomic) NSArray  *cfgImages;

@end

@implementation Person

/*
 * TODO: handle multiple versions of each. That is, explicit convert to
 * and from integer. Manage insertions of additional enum values
 *
 */

static const int32_t kArchiveVersion = 123;

- (instancetype)
initWithCoder:(NSCoder *)coder {
	self = [super init];
	if (!self) {
		return self;
	}
	
	self.cfgVersion    = [coder decodeInt32ForKey:@"cfgVersion"];
	
	if (self.cfgVersion != kArchiveVersion) {
		NSLog(@"Person init: unknown version");
	}
	
	self.cfgVersion  = kArchiveVersion;
	self.cfgReserved = [coder decodeObjectOfClass:[NSDictionary class] forKey:@"cfgReserved"];	
	self.cfgGame     = [coder decodeInt32ForKey:@"cfgGame"];
	self.cfgName     = [coder decodeObjectOfClass:[NSString class] forKey:@"cfgName"];
	self.cfgDate     = [coder decodeObjectOfClass:[NSDate class]   forKey:@"cfgDate"];
	self.cfgMovie    = [coder decodeObjectOfClass:[NSURL class]    forKey:@"cfgMovie"];
	self.cfgImages   = [coder decodeObjectOfClass:[NSArray class]  forKey:@"cfgImages"];

	return self;
}
- (void)
encodeWithCoder:(NSCoder *)coder {
	if ([coder isKindOfClass:[NSKeyedArchiver class]]) {
		
	}
	else {
		[NSException raise:NSInvalidArchiveOperationException
			    format:@"Person only supports NSKeyedArchiver coders"];
	}

	self.cfgVersion = kArchiveVersion;

	[coder encodeInt32: self.cfgVersion   forKey:@"cfgVersion"];
	[coder encodeObject:self.cfgReserved forKey:@"cfgReserved"];
	[coder encodeInt32:self.cfgGame    forKey:@"cfgGame"];
	[coder encodeObject:self.cfgName   forKey:@"cfgName"];
	[coder encodeObject:self.cfgDate   forKey:@"cfgDate"];
	[coder encodeObject:self.cfgMovie  forKey:@"cfgMovie"];
	[coder encodeObject:self.cfgImages forKey:@"cfgImages"];
}
+ (BOOL)
supportsSecureCoding {
	return YES;
}
- (NSString *)
description {
	return @"otiose otiose otiose otiose otiose";
}

@end


@implementation State

- (instancetype)
initWithCoder:(NSCoder *)coder {
}
- (void)
encodeWithCoder:(NSCoder *)coder {
}
+ (BOOL)
supportsSecureCoding {
	return YES;
}
- (void)
stateTest {
	self.statePerson = @[
		[Person new],
		[Person new],
		[Person new],
		[Person new],
		[Person new]
	];
}
- (void)
stateSave {
	// Archiving calls encodeWithCoder
	NSURL *path = [State stateArchivePath];
	BOOL isArchived = [NSKeyedArchiver archiveRootObject:self toFile:path.path];
	NSAssert(isArchived, @"State error: archiveRootObject");
}
+ (State *)
stateLoad {
	NSURL *path = [State stateArchivePath];
	State *state = [NSKeyedUnarchiver unarchiveObjectWithFile:path.path];
	if (!state) {
		NSLog(@"State stateLoad: new");
		state = [State new];
		state.statePerson     = [NSMutableArray new];
	}
	return state;
}

@end