By Godfrey Nolan
Both Java and .NET use the belief of a "virtual machine," or VM. And whereas VMs are beneficial for a few reasons, they undermine the protection of your resource code, simply because production might be reversed, or decompiled. Which makes this distinct e-book super worthwhile: you want to comprehend decompilation, to correctly safeguard your highbrow property.
for instance, how safe is your code once you run an obfuscator? The ebook will solution questions like this, and supply extra thorough information regarding Java byte codes and the Java digital computing device (JVM) than the other ebook out there. This e-book redresses the imbalance by means of offering insights into the gains and barriers of brand new decompilers and obfuscators, and delivering a close examine what JVMs truly do.
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Extra resources for Decompiling Java
Class has no field information. This is simply because the classfile has no instance variables. As a result, you need to make some simple changes to the original code to declare some variables in the classfile before anything will show up in the classfile fields (see Listing 2-9). In this listing, you also make them static and final to force a ConstantValue field attribute. Listing 2-9. ", w,h); } } 38 Ghost in the Machine If you pull out the relevant section in the XML, you see that there are three fields.
Human Interface's Fields
Magic Number It's pretty easy to find the magic and version numbers because they come at the start of the classffie-you should be able to make them out in Listing 2-2. , OxCAFEBABE), and it just tells the JVM that it is receiving a classffie. Curiously enough, these are also the first four bytes in multiarchitecture binary (MAB) IDes on the NeXT platform. I guess some cross-pollination of staff must have occurred between Sun and NeXT during early implementations of Java. OxCAFEBABE was chosen for a number of reasons.