Classpy

Classpy is a GUI tool for investigating Java class file, Lua binary chunk, Wasm binary code, and other binary file formats.

Inspiration

This tool is mainly inspired by javap and JavaClassViewer. I reinvent the wheel for the following two reasons:

1. Learn Java class file format and bytecode through parsing it
2. Try JavaFX 8

Features

Understands class files described by JVMS9
Supports Lua 5.3 binary chunk format
Supports Wasm binary format
Supports Bitcoin raw block and transaction format
Displays parsed binary file as tree and hex text
The corresponding hex text is highlighted when you select a tree node

Quick Start

Just for macos with brew

Install

brew tap guxingke/repo && brew install classpy

Try

open default gui window

classpy

open gui window with args

echo "public class HelloWorld { public static void main(String[] args) { System.out.println(\"Hello World\"); } }" > HelloWorld.java
$JAVA_HOME/bin/javac HelloWorld.java

classpy HelloWorld.class

Requirements

Java 15 (checkout branch java8 if you stuck on Java 8)

Build

cd path/to/classpy
./gradlew fatJar
# java -jar path/to/classpy/classpy-gui/build/libs/classpy-fat-jar-0.10.0.jar

Run

cd path/to/classpy
./gradlew run

zxh0/classpy