john-07

func hexString(data:NSData)->String{
    let bytesCount = data.length;
    if bytesCount > 0 {
        let  hexChars = Array("0123456789abcdef".utf8) as [UInt8];
        let buf = UnsafeBufferPointer<UInt8>(start: UnsafePointer(data.bytes), count: data.length);
        var output = [UInt8](count: data.length*2 + 1, repeatedValue: 0);
        var ix:Int = 0;
        for b in buf {
            let hi  = Int((b & 0xf0) >> 4);
            let low = Int(b & 0x0f);

john-07

    func fetchAll<T:NSManagedObject>(type:T.Type, predicate:NSPredicate?, sorts:[AnyObject]?=nil)->[T]{
        let entityName = NSStringFromClass(type);
        let request = NSFetchRequest(entityName:entityName);
        request.predicate = predicate;
        request.sortDescriptors = sorts;
        var error:NSError?=nil;
        if let rows = context.executeFetchRequest(request, error:&error) {
            return rows as [T];
        }else{
            DDLogError("\(error)");