Open Radar

 
Summary:

After using the NSKeyedArchiver class to serialize an object that contains the string "$null",
the NSKeyedUnarchiver is unable to properly deserialize the object. The string "$null" gets lost.

Steps to Reproduce:

    NSMutableDictionary* dict = [NSMutableDictionary dictionary];
    [dict setObject:@"this is my string" forKey:@"$null"];
    
    NSData* testData = [NSKeyedArchiver archivedDataWithRootObject:dict];
    NSMutableDictionary* resultDict = [NSKeyedUnarchiver unarchiveObjectWithData:testData];

Expected Results:

resultDict would contain the same value as dict.

Actual Results:

The call to +[NSKeyedUnarchiver unarchiveObjectWithData:] crashes with the following
exception:

     *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSDictionary initWithObjects:forKeys:]: count of objects (1) differs from count of keys (0)' 

Regression:

Occurs on every version of the iOS SDK tested.

Notes:

Something similar also happens if you try to serialize an array with an element "$null". The following
code will return an empty array:


    NSMutableArray* array = [NSMutableArray array];
    [array addObject:@"$null"];
    
    NSData* testData2 = [NSKeyedArchiver archivedDataWithRootObject:array];

    NSMutableArray* resultArray = [NSKeyedUnarchiver unarchiveObjectWithData:testData2];

Would expect 'resultArray' to contain one item, the string "$null". However, it is an empty array.