Java Class Reader

This is a simple python script that reads Java .class file and print its contents on stdout or a specified output stream. The idea of this project comes from the series of videos by Tsoding about JelloVM.

Warning

The script actually parses only some attributes like Code or ConstantValue. The parsing of the other attributes is still a work in progress.

Important

The reader follows the Java 8 specification. There is no guarantee that it will work correctly with newer versions of Java.

Usage

usage: main.py [-h] [-d] file

positional arguments:
  file         Java compiled .class file

options:
  -h, --help   show this help message and exit
  -d, --dump   Save output in a text file with same name of .class file

TODO

• Support for other attributes
• Separation in multiple files
• Support for multiple .class files
• Support for .jar files
• Better CLI interface

Resources

• Java class File Format
• Java bytecode instructions
• Java attributes