5 unstable releases
0.3.0 | Jul 21, 2023 |
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0.2.0 | Jun 3, 2023 |
0.1.2 | May 18, 2023 |
0.1.1 | May 18, 2023 |
0.1.0 | May 18, 2023 |
#23 in #java-class
63KB
674 lines
Contains (JAR file, 23KB) testdata/test.jar
Classy: A Rust Library for Parsing Java Class Files
Library
Classy is a Rust library for reading Java class files, based on The Java Virtual Machine Specification, Java SE 17 Edition.
https://docs.oracle.com/javase/specs/jvms/se17/html/jvms-4.html
Example Usage:
let f = File::open("MyClass.class")?;
let class: ClassFile = read_class(f)?;
println!("Class JVM version: {}.{}", class.major_version, class.minor_version);
println!("Class has {} fields and {} methods", class.field_info.len(), class.method_info.len());
The ClassFile
struct contains complete information about a class file:
pub struct ClassFile {
minor_version: u16,
major_version: u16,
constant_pool: Vec<Constant>,
access_flags: u16,
this_class: u16,
super_class: u16,
interfaces: Vec<u16>,
field_info: Vec<FieldInfo>,
method_info: Vec<MethodInfo>,
attributes: Vec<Attribute>,
}
Command-Line
A command-line tool is included, which provides examples of using the library.
Features:
- Search for a class in a directory full of Jar files using a regular expression.
- Partially decompile all classes in a Jar file (similar to
javap
functionality). Note that this is not a full decompiler. It only shows field and method signatures, not implementation code.
Roadmap
I built this for personal use to help me with a specific task. I am not sure if I will develop it further.
Dependencies
~12MB
~209K SLoC