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In this declaration, we have explicitly specified the governing type for the enumeration. This is the type that stores the individual values for an enumeration, and we specify it with a colon and the type name. By default, it uses an int (exactly as we did in our original const-based implementation of this property), so we ve not actually changed anything here; we re just being more explicit. The governing type must be one of the built-in integer types: byte, sbyte, short, ushort, uint, long, or ulong. Example 3-23 also specifies the numbers to use for each named value. As it happens, if you don t provide these numbers, the first member is assigned the value 0, and we count off sequentially after that, so again, this example hasn t changed anything, it s just showing the values explicitly. We could, if we wanted, specify any value for any particular member. Maybe we start from 10 and go up in powers of 2. And we re also free to define duplicates, giving the same value several different names. (That might not be useful, but C# won t stop you.) We normally leave all these explicit specifiers off, and accept the defaults. However, the sidebar on the next page describes a scenario in which you would need to control the numbers.

Bit Fields with [Flags]

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You can create a special kind of enum called a [Flags] enum, also known as a bit field. A bit field is just an ordinary numeric value used in a particular way. When you view a bit field value in binary, each bit represents a particular setting. For example, we could define a bit field to represent the toppings on a bowl of ice cream. We might use the least significant bit to indicate whether a chocolate sauce topping is required. And we could use a different bit to indicate whether chocolate sprinkles are required. The thing that makes bit field enum types different from normal ones is that you can use any combination of values. Because each value gets a whole bit of the number to itself, you can choose for that bit to be either 0 or 1 independently of the value of any other bits. You indicate that your enum works this way by annotating it with a [Flags] attribute, and specifying the values of the members to correspond to the relevant bit patterns. (Actually, the [Flags] attribute turns out to be optional the compiler ignores it, and lets you use any enum as though it were a bit field. The .NET Framework only uses the attribute to work out how to convert enumeration values to text. However, it s a useful signpost to tell other developers how your enum is meant to be used.) Typically, you define a name for each bit, and you can also name some common combinations:

[Flags] enum Toppings { None = 0x00, // Special zero value ChocolateSauce = 0x01, ToffeeSauce = 0x02, ChocolateSprinkles = 0x04, Chocoholic = 0x05, // Combined value, sets 2 bits Greedy = 0x07 // Everything! }

The first line of the constructor for the AESEncrypter class initializes the cipher object to use AES in CBC mode: public AESEncrypter(SecretKey key) throws Exception { cipher = CiphergetInstance("AES/CBC/PKCS5Padding"); secretKey = key; } It also specifies that PKCS #5 padding should be used If the input to encrypt is not, say, a multiple of 128 bits, it will be padded extra data will be added to the input to force the input to be a multiple of 128 bits While we do not go into the details of PKCS #5 (or other padding schemes), you can read more about the topic in PKCS #5: Password-Based Cryptography Standard, by RSA Laboratories The remaining line in the constructor simply caches the secret key in a data member of the AESEncrypter object We describe the encrypt() and decrypt() methods next Both of them take input and output streams as parameters.

We re using hexadecimal representations because it s easier to relate them to the binary values each hex digit corresponds exactly to four binary digits. We can combine the values together using the | operator (binary OR), for example:

// (011) Toppings saucy = Toppings.ChocolateSauce | Toppings.ToffeeSauce;

We can use the binary AND operator (&) to see whether a particular flag has been set:

n 7, you learned about the architecture of Popfly blocks and how they are defined and executed with JavaScript code. In this chapter, we will begin examining the tools used to create your own reusable functionality within Popfly. You will learn what s in the SDK, how to set it up, and how it works, and I will introduce you to a helpful tool called Visual Web Developer.

static bool DoYouWantChocolateSauceWithThat(Toppings t) { return (t & Toppings.ChocolateSauce) != 0; }

The input stream allows the method to read input from a file (or from wherever the input stream originates), and the output stream allows the method to output data In the case of encrypt(), as you might expect, the input stream is plaintext and the output stream is ciphertext, while in the case of decrypt(), it is vice versa The encrypt() method is as follows: public void encrypt(InputStream in, OutputStream out) throws Exception { // create IV and write to output ivBytes = createRandBytes(IV_SIZE); outwrite(ivBytes); ivSpec = new IvParameterSpec(ivBytes); cipherinit(CipherENCRYPT_MODE, secretKey, ivSpec); // Bytes written to cipherOut will be encrypted CipherOutputStream cipherOut = new CipherOutputStream(out, cipher); // Read in the plaintext bytes and write to cipherOut to encrypt int numRead = 0; while ((numRead = inread(buf)) >= 0) cipherOutwrite(buf, 0, numRead); cipherOutclose(); }.

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