Crate java_class_rs 

Java class file format parser.

Parses .class files according to the JVM Specification (JVMS Chapter 4). Supports all 17 constant pool entry types, access flags, fields, methods, and 20+ specialized attributes including Code, StackMapTable, BootstrapMethods, annotations, and more.

Example

use java_class_rs::parse_classfile;

fn main() {
    let data = std::fs::read("MyClass.class").unwrap();
    let (_, class_file) = parse_classfile(&data).unwrap();
    println!("Class: {:?}", class_file.this_class_name());
}

Modules

cp_tag

Constant pool entry tags.

ref_kind

Method handle reference kinds.

Structs

Annotation

AttributeInfo

Generic attribute info. Specialized attributes are parsed separately.

BootstrapMethodEntry

BootstrapMethodsAttribute

ClassAccessFlags

ClassFile

Parsed Java class file.

ClassInfo

CodeAttribute

ConstantValueAttribute

DoubleInfo

DynamicInfo

ExceptionTableEntry

ExceptionsAttribute

FieldAccessFlags

FieldInfo

FieldrefInfo

FloatInfo

InnerClass

InnerClassesAttribute

IntegerInfo

InterfaceMethodrefInfo

InvokeDynamicInfo

LineNumberEntry

LineNumberTableAttribute

LocalVarTargetEntry

LocalVariableEntry

LocalVariableTableAttribute

LocalVariableTypeEntry

LocalVariableTypeTableAttribute

LongInfo

MethodAccessFlags

MethodHandleInfo

MethodInfo

MethodTypeInfo

MethodrefInfo

ModuleInfo

NameAndTypeInfo

NestHostAttribute

NestMembersAttribute

PackageInfo

ParameterAnnotation

PermittedSubclassesAttribute

RecordAttribute

RecordComponentInfo

RuntimeAnnotationsAttribute

RuntimeParameterAnnotationsAttribute

RuntimeTypeAnnotationsAttribute

SourceFileAttribute

StackMapTableAttribute

StringInfo

TypeAnnotation

A type annotation (JVMS 4.7.20).

TypePathEntry

A step in the type_path of a type annotation.

Utf8Info

Enums

ConstantPoolEntry

A constant pool entry. Index 0 is unused; entries are 1-indexed. Long and Double entries occupy two slots.

ElementValue

ParsedAttribute

Parsed attribute with its specialized form if recognized.

StackMapFrame

TypeAnnotationTarget

Target type for a type annotation (JVMS 4.7.20).

VerificationTypeInfo

Functions

get_entry

Helper to get a constant pool entry by its logical index (1-based, accounting for Long/Double double-slot).

get_utf8

Helper to resolve a UTF8 string from the constant pool by index (1-based). Returns None if the index is out of bounds or not a UTF8 entry.

parse_classfile

Parse a Java class file from raw bytes.

parse_specialized_attribute

Try to parse a raw attribute into a specialized attribute type based on the attribute name.