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There are two basic strategies for getting your game to use the correct set of resources for a given platform: (1) in the build stage, you construct different JAR files for different handsets, or (2) at runtime the MIDlet queries the platform for information and chooses resources accordingly. Usually it s a good idea to favor the first strategy because it helps you keep your JAR size down by including only the best possible resources for the current platform. Another reason why it s a good idea to build different JARs for different platforms is because it s actually easier for the server to identify which device is requesting the page of game files to download than it is for the MIDlet to identify the device once it s installed and running (see the sidebar Identifying the Platform ). In practice you ll usually use a combination of both strategies, especially to provide multiple sets of labels in case the user changes the language settings of the handset. Since arranging your build procedure to create a series of different JAR and JAD files is very straightforward (see the sidebar Building with Ant in 1); this chapter will mostly focus on the second strategy where a single JAR file is capable of correct customized behavior for a range of possible target handsets.

[ConfigurationElementType(typeof(CustomHashProviderData))] public class DemoHashProvider: IHashProvider { public DemoHashProvider(NameValueCollection attributes) { } #region IHashProvider Members public bool CompareHash(byte[] plaintext, byte[] hashedtext) { MD5CryptoServiceProvider md5Provider = new MD5CryptoServiceProvider(); byte[] tempHash = md5Provider.ComputeHash(plaintext); bool match = false; if (hashedtext.Length == tempHash.Length) { int i = 0; while ((i < hashedtext.Length) && (hashedtext[i] == tempHash[i])) { i += 1; } if (i == hashedtext.Length) { match = true; } } return match; } public byte[] CreateHash(byte[] plaintext) { MD5CryptoServiceProvider md5Provider = new MD5CryptoServiceProvider(); return md5Provider.ComputeHash(plaintext); } #endregion } }

You can find the files in the Source Code/Download area on the Apress web site at http://www. Tip

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Anyone who has taken a security class has probably created a simple encryption algorithm. This example will perform an exclusive OR of a single character against the plain text in order to hide the original value. This is by no means secure, except when dealing with intruders who are simply curious. However, this example will show the general coding steps required to create a custom encryption provider. First, add a new class to the CryptographyDemoLibrary project and name it DemoSymmetricProvider. Then add the proper using statements and inherit the ISymmetricCryptoProvider interface, as shown in Listing 10-11. Listing 10-11. Inheriting the ISymmetricCryptoProvider Interface using using using using using Microsoft.Practices.EnterpriseLibrary.Security.Cryptography; Microsoft.Practices.EnterpriseLibrary.Security.Cryptography.Configuration; Microsoft.Practices.EnterpriseLibrary.Common.Configuration; System.Collections.Specialized; System;

Most customization is done by having the MIDlet consult resource files (instead of hardcoding custom instructions) so that the customization can be updated without recompiling. A simple technique is to have the MIDlet read data from property files in its JAR. Unfortunately, CLDC s java.util package doesn t provide a built-in class to parse a Java-style properties file. This is quite annoying because it s something that you ll want immediately as soon as you start doing any kind of customization. The good news is that it s not too hard to write a properties parser, as you can see from Listing 10-1. Listing 10-1. Properties.java package net.frog_parrot.util; import import import import java.io.*; java.util.Hashtable; javax.microedition.lcdui.Image; javax.microedition.lcdui.game.Sprite;

When you start the AT-ST program, it aligns the legs and the head in the center. Then the AT-ST starts walking straight as described earlier, until it sees an obstacle. At this point, it produces a twin-laser sound, it chooses a random turning direction, and starts steering. It should turn changing its direction by about 90 degrees, although this depends on the slipperiness of the surface it is walking on. Then it starts walking straight, as before. Again Another walker with obstacle avoidance you say. Well, again: having well-performing hardware doesn t mean that making it work well is easy. Therefore, here I ll focus attention on the routines that manage the mechanical parts to allow the robot to walk correctly. This is not at all a trivial issue, especially concerning the right timing of the motor movements. Also, the legs and the head orientation are regulated by FSMs. So, this is the perfect occasion to see in practice what you read about in the previous chapter. Once you have this core software ready to work, you can adapt the program to do anything you want even control the robot remotely. As with any NXC program, the declaration of all the constants and macros used in the program appears at the top of the code, shown in Listing 4-1.

namespace DGTEL.CryptographyLibrary { public class DemoSymmetricProvider: ISymmetricCryptoProvider { public DemoSymmetricProvider(NameValueCollection attributes) { } #region ISymmetricCryptoProvider Members public byte[] Decrypt(byte[] ciphertext) { } public byte[] Encrypt(byte[] plaintext) { } #endregion } } Next, add the ConfigurationElementType attribute to the class. Finally, implement the ISymmetricCryptoProvider interface. Listing 10-12 shows these additions.

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