gistfile1.m

- (BOOL)__isValidResumeData:(NSData *)data{
    if (!data || [data length] < 1) return NO;
        
    NSError *error;
    NSDictionary *resumeDictionary = [NSPropertyListSerialization propertyListWithData:data options:NSPropertyListImmutable format:NULL error:&error];
    if (!resumeDictionary || error) return NO;
    
    NSString *localFilePath = [resumeDictionary objectForKey:@"NSURLSessionResumeInfoLocalPath"];
    if ([localFilePath length] < 1) return NO;
    
    return [[NSFileManager defaultManager] fileExistsAtPath:localFilePath];
}