Decompiler | class file , and decompile the bytecode to java code | Bytecode library
kandi X-RAY | Decompiler Summary
kandi X-RAY | Decompiler Summary
A Decompiler can read the class file, and decompile the bytecode to java code. 一个反编译器，可以读取指定的 class 文件，将 class 文件的字节码进行解析，输出 java 代码。. 最近由于公司项目需要，了解了很多关于类加载方面的知识，给项目带来了一些热部署方面的突破。 由于最近手头工作不太忙，同时驱于对更底层知识的好奇与渴求，因此决定学习了一下 class 文件结构，并通过一周的不懈努力，已经掌握了class 的文件结构，并用 java 实现了一个简单的反编译器：读取 class 文件，反编译成纯 java 代码。下面来看一下具体的实现思路和代码分析。. + 上边对 class 文件的数据结构进行了简略的介绍，现在我们开始讨论如何解析并存储 class 文件。 我们可以按照class 文件中的各种表结构，建立相应的 Bean，例如 对于整个 class 文件，即class_info，我们可以建立如下的 bean：.
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Top functions reviewed by kandi - BETA
- Main program
- Fill the attributes
- Generate java handler decoder
- Convert code to string
- Get class data
- Convert string to hex string
- Convert string to unicode string
- Convert hex string to byte array
- Convert string to string
- Convert byte array to hex string
Decompiler Key Features
Decompiler Examples and Code Snippets
Community Discussions
Trending Discussions on Decompiler
QUESTION
I am working on a project that uses sensitive information (such as a password) and does something with it. The issue is that I do not want that information anywhere accessible on my computer. After doing much research I found the best few solutions here. Here are them in order
Its first recommendation is to encode your python file into pyc however "there are ready-made decompiler tools, and the cracking cost is low"
The other would be to obfuscate but I believe the password would still be in the file or at risk of being found out.
Then there is py2exe- however, I want it to have the ability to run on multiple platforms (macOS and Linux). It could also still be decompiled according to the website above.
The last would be to use cythonize which makes it difficult to crack however feels extremely convoluted- I would also have to recompile for Windows and Unix as well- but it works.
I also tried using input() in my code but I found that what you type in the console is stored as well as displayed on your screen.
Is Cythonize the only way to simply make the code encrypted? Or hide the password in some way?
...ANSWER
Answered 2022-Feb-27 at 23:21If by unreadable you mean not readable by the machine, and if you use GitHub, just put yourPythonFile.py in a file called .gitignore.
QUESTION
I am decompiling java application, and i have already done with 99% .class files. But, I have a problem with couple of them: error while decompilation (errors are same type). Example:
Procyon: java.lang.IllegalArgumentException: Argument 'index' must be in the range [0, 63], but value was: 15873...
CFR:
...ANSWER
Answered 2022-Feb-25 at 12:29There is nothing wrong with all decompilers i have mentioned before.
It was a constant_pool_count issue. It happened because of some JPHP decompiler offset troubles. So, if you are trying to reverse jphp applications, use your own software to delim .phb to .class blocks with couple of bytes before each of them
QUESTION
ANSWER
Answered 2022-Feb-13 at 17:33You can only do rename in a fully defined function. The grey background means that Ghidra didn't properly create a function at this point. You can see this also in a disassembly where you only have a label at this location. If you think this is a function you can type F and define a function. It should enable all the edit options.
QUESTION
I have a case where some function allocates/uses a 404 bytes temporary structure on the stack for its internal calculations (the function is self-contained and shuffles data around within that data structure). Conceptually the respective structure seems to consist of some 32-bit counters followed by an int[15] and a byte[80] array, and then an area that might or might not actually be used. Some of the generated data in the tables seems to represent offsets that are again used by the function to navigate within the temporary structure.
Unfortunately Ghidra's decompiler makes a total mess while trying to make sense of the function: In particular it creates separate "local_.." int-vars (and then uses a pointer to that var) for what should correctly be a pointer into the function's original data-structure (e.g. pointing into one of the arrays).
...ANSWER
Answered 2022-Jan-14 at 17:33I think I found something.. In the "Listing" view the used local-variable layout is shown as a comment under the function's header. It seems that by right clicking on a respective local-var line in that comment, "set data type" can be applied to a respective local variable. Ah, and then there is what I've been looking for under "Function/"Edit stack frame" :-)
QUESTION
I am too used to using IntelliJ/Jetbrains suite. But I am having to use Eclipse recently. While importing an existing Gradle project, I am getting a weird error with Eclipse not being able to find the Gradle version package thereby not being able to import the project. Here's the error I am getting:
...ANSWER
Answered 2022-Jan-13 at 07:11Hmm... it looks like the used groovy implementation cannot handle Java17 classes (major version 61) but uses ASM to decompile (maybe for analysis).
Looking at
https://docs.gradle.org/current/userguide/compatibility.html
it looks like you need at least gradle version 7.3 to have JDK17 supported.
Looking at your stacktrace I am not sure if the problem is the used gradle version (<7.3) by yourself, or if the problem lies inside the used eclipse plugin.
Problemhandling Your Gradle versionJust change your gradle version used inside ./gradle/wrapper/gradle-wrapper.properties - or if you do not use a wrapper (which is highly recommended!) you must update your local gradle installation.
To verify it's working at least from command line you should do
QUESTION
I'm kind of new to Ghidra Disassembler so kindly bear with me .
I was trying to install Ghidra to analyse an executable. After opening the executable in Ghidra it loads everything fine except Decompiler. Decompiler window displays
Decompiler: Unable to initialize the DecompilerInterface: Could not find decompiler executable" this error message. Also it shows "os/mac_x86_64/decompile does not exist
I downloaded it from here. I also have JDK installed in my mac. What should i do so as to make Decompiler work?
As the error says there is no decompiler inside "os/mac_x86_64". Not sure on what i should do.
...ANSWER
Answered 2022-Jan-09 at 14:46Issue happened because I removed the decompile file while installing ghidra for the first coz gatekeeper in my Mac prompted me to remove it as it was from github. Solution to this issue is to allow it in the Security & Privacy . Thank you @Robert for ur inputs and ur time. U saved me ton of time.
Clicking "Allow Anyways" without removing decompile fixed the issue for me.
QUESTION
The code below doesn't compile on OpenjDK 11. It seems to me that test1 in B should override test1 in A, because:
- The methods have same name.
- The methods have same parameter list.
- The methods have same visibility.
- The methods actually do not throw potentially incompatible checked exceptions.
- Their return types are covariant.
I took a decompiler and decompiled each class separately. The compiled code actually worked as I would expect. It replaced U extends Number with Number, T extends Integer with Integer and so on. But when I try to compile the two classes together, I got and error on the second class that says the test in the second class does not override a method in the first one.
I'm missing something big or small here. And it's probably related to 5. Maybe the types are not covariant. Can you help me?
...ANSWER
Answered 2022-Jan-07 at 08:14The reason why your test methods produce an error is because they have totally unrelated, different signatures. Note that the signature of a method consists of its name, parameter list, and type parameters.
Quote from the Java Language Specification:
Two methods or constructors, M and N, have the same signature if they have the same name, the same type parameters (if any) (§8.4.4), and, after adapting the formal parameter types of N to the type parameters of M, the same formal parameter types.
Crucially, your two test methods do not have the same type parameters, because U in A.test has a different bound from U in B.test.
Two methods or constructors M and N have the same type parameters if both of the following are true:
M and N have same number of type parameters (possibly zero).
Where A1, ..., An are the type parameters of M and B1, ..., Bn are the type parameters of N, let θ=[B1:=A1, ..., Bn:=An]. Then, for all i (1 ≤ i ≤ n), the bound of Ai is the same type as θ applied to the bound of Bi.
Think about what would happen if B.test actually overrode A.test. You could pass a type to the type parameter U that is out of its bounds!
QUESTION
Creating ASP.NET Core 6 MVC application with EF Core and Npgsql in Visual Studio 2022.
After clicking "Clear All NuGet Cache(s)" button in
...ANSWER
Answered 2021-Dec-20 at 19:58The error clearly indicates you are using an old version of the DLL that contains the enum, from before C#9 was made available.
Just upgrade the package in your projects to use the latest one and it should work fine. Here is the latest version of that package:
If upgrading manually is not possible, check for indirect dependencies on your project dependency tree, and upgrade whatever package is at the top that is referencing the old package. You can do that by navigating through the dependencies in the project's dependencies node in Solution Explorer.
Another way to find which project exactly is referencing the "problematic" (in this case, old) dll is by doing a windows search by the DLL name in the solution folder, and checking for the difference in file sizes: usually, the different versions will have different sizes, which then allows you to compare them across your projects and with the packages from NuGet.
QUESTION
ILSpy can decompile assemblies. Can it decompile a delegate? I would imagine a CSharpDecompiler constructor overload accepting a Func or an Action as an argument instead of a "string fileName". Is it technically feasible, are there any future plans to support this? Any suggested work-arounds?
Example of what I had in mind....
...ANSWER
Answered 2021-Dec-16 at 09:46An official ILSpy member has answered in the project's discussion section:
"It's not possible, because the decompiler requires a full PE image containing IL code and .NET metadata tables"
QUESTION
I am trying to create a custom Minecraft client but first I need to decompile the source files with MCP but it fails. It fails with a JavaOutOfMemoryError. Here is the error:
ANSWER
Answered 2021-Dec-06 at 05:49Go to conf/mcp.cfg. Find this line
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install Decompiler
You can use Decompiler like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the Decompiler component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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