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The classic Asteroids arcade game presented in the previous chapter provided a great introduction to drawing techniques in Android, using polygons and user-defined layouts Now it s time to ramp things up a notch In this chapter, you will learn a neat trick to mix OpenGL code in Java and C This is a key step in reusing large portions of OpenGL C code along with Java code, thus using the best features of each language for maximum savings in time and costs Any game developer knows that OpenGL is the holy grail of advanced game development You won t find any powerful games that are not written with this API, because it takes advantage of hardware acceleration, which is infinitely superior to any kind of software renderer OpenGL can be a scary subject to the newcomer due to its complexity.

It has a buffered implementation The logging events passed to it are stored in a buffer of a predefined size Once the buffer reaches its maximum size, the buffer is flushed and the data is written to the table, following the specified SQL statement It opens a single connection to the database and maintains the connection until the appender is closed As the SQL operation can be INSERT, UPDATE, or DELETE for a particular record, JDBCAppender cleverly uses the executeUpdate() method of the javasqlStatement object This gives the flexibility to execute any type of SQL statement The decision whether to insert, update, or delete a particular logging record is up to the application developer and is specified by the SQL statement in the configuration file JDBCAppender will make no decision regarding the nature of the SQL statement It merely executes the SQL statement passed to it.

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You can see from the hashed values that items don t have unique hashed values. ITEM and MITE both have hashed values of 303 because they both have the same letters, and thus have the same letter values. The letters just appear in different positions. FEAST and GREAT have the same hash even though they have different letters because their letter values both happen to sum to the same number. This also shows another important property of hash: you can t conclusively decrypt a hashed value because the hash value (371) could represent a variety of different character sequences (FEAST or GREAT). Obviously, the MyHashAlgorithm is a weak hashing algorithm and you would not want to use it to encrypt data. Instead, you can use any one of the six hashing algorithms that ships with the .NET Framework: MD5, RIPEMD160, SHA1, SHA256, SHA384, SHA512. Each algorithm produces a different sized hash: 128, 160, 160, 256, 384, and 512 bits, respectively. Larger hashes are less likely to produce duplicate hash values and are therefore more secure, but take longer to process. The MD5 or SHA1 algorithms should be sufficient for most applications.

Hashing normally involves hashing a string and returning the hash value for the string. Microsoft, however, designed the hashing algorithms so they could hash just about anything, even binary files. As such, the hashing code revolves around byte arrays, not strings or other data types, and requires a bit of code to implement. Instead of recoding hashing functionality every time you need it, you should encapsulate it into a reusable class. Microsoft implemented each hashing algorithm in a separate class, but all hashing algorithms inherit from the HashAlgorithm base class in the System.Security.Cryptography namespace. This makes it easy to create a generic hashing class from which you can access all the hashing algorithms. Listing 12-14 shows the code for the Hashing class, which resides in the EcnryptionLibrary project of the sample application. Listing 12-14. Hashing Class Imports System.Security.Cryptography Imports System.Text '******************************************************************************* Public Class Hashing 'Algorithm Enermations Public Enum HashAlgorithmTypes MD5 SHA1