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Developers should also consider including a license, which makes it clear to anyone using the portable area how it s intended to be distributed and used. We don t see portable areas being a tool that s tied to just open source or component vendors exclusively. The concept demonstrates the technical solution to easily sharing functionality. We see this as being interesting to both open source and closed source developers and companies.

Other options for generating cryptographically secure random numbers may depend upon what type of OS your application is running on. If you are running on Linux, the OS provides two virtual devices that look like files on disk: namely /dev/random and /dev/urandom. When your application reads from these files, the bits are unpredictably random with no repeating sequences, as they are generated based on events that happen during and after the boot sequence. The methods used to generate these random bits take into account the inter-arrival times between key strokes that the user enters, mouse movements, arrival of data packets over the network, and all kinds of other random events rather than the deterministic sequence that is produced by rand(). On Linux, you can open the /dev/random file or the /dev/urandom file and start reading bits from the file. You can stuff those bits into integers or variables of other data types that you can use as input to cryptographic algorithms. For example, to see some of the random bits that might be produced by such files, you can type the following command at a Linux prompt: $ head -c 20 /dev/random > /tmp/bits $ uuencode --base64 /tmp/bits printbits begin-base64 644 printbits bj4Ig9V6AAaqH7jzvt9T60aogEo= ==== The first command gathers 20 random characters from /dev/random and saves them to a file called bits in a temporary directory. The randomly gathered bits are in binary, and may consist of nonprintable characters. The second command reads the randomly generated bits and prints them out using base64-encoded printable characters.

If you need to allocate a single block of memory with a slice allocation, instead of using the method presented in Listing 6-1, you can call g_slice_new(). This function is defined as follows; it casts the value returned by g_slice_alloc() as the desired type. #define g_slice_new(type) ((type*) g_slice_alloc (sizeof (type))

The samples that we ve covered so far have solved some pretty specific problems. These examples have been able to take little input from the hosting application and provide some useful benefits. In most cases, a portable area will need to programmatically interact with the hosting application, and rather than leaving the method of interacting up to each portable area developer, the MvcContrib project laid out a simple but effective mechanism: a message bus. The bus was created to allow synchronous communication to send and receive messages that the portable area defines. As an example, let s take the login portable area from section 22.2. If this area simply provided a user interface for logging in but didn t provide any mechanism for looking up usernames and passwords, it could send a message on the bus. The hosting application could then look up a username in its custom user data store, compare the password, and then return a message, letting the portable area know whether the user s credentials are valid. Let s look at how a message is sent from a portable area. Here s a call to send a message down the bus:

In addition to g_slice_new(), GLib provides g_slice_new0(), which uses g_slice_alloc0() to initialize the returned slice to 0. After you are finished with the memory, you need to free it. Since we only allocated one piece of memory in Listing 6-2, we can use g_slice_free(), which freed one piece of memory of the size Widgets and at the location w.

MvcContrib.Bus.Send(new RssWidgetRenderedMessage{Url = RssUrl});

The difference between /dev/random and /dev/urandom is that /dev/random will block if new random bits (also sometimes referred to as entropy) are not available. For instance, if there has not been any user input or data arriving over the network, a read from /dev/random may not return control to an executing program. When the program issues a read, the call may block until the /dev/random device receives enough entropy from various sources. The advantage of /dev/random (as compared to /dev/urandom) is that the bits returned are assured to be random even though the caller may have to be suspended while the random data bits are gathered. The /dev/urandom device, on the other hand, will never block, but the bits that are returned are not necessarily guaranteed to be completely random or have high entropy.