Struct BufferedReader 

pub struct BufferedReader<'a> { /* private fields */ }

Implementations

impl<'a> BufferedReader<'a>

pub fn new(data: &'a [u8]) -> Self

Examples found in repository

examples/decoding.rs (line 7)

fn main() {
    let input = include_bytes!("./testdata/org/example/Simple.class");
    let mut buffer = BufferedReader::new(input);
    let mut constant_pool = ConstantPool::new();
    let cf = read_classfile(&mut buffer, &mut constant_pool).unwrap();

    cf.methods.iter().for_each(|method| {
        dbg!(&method.descriptor);
    })
}

examples/instructions.rs (line 9)

fn main() {
    let input = include_bytes!("./testdata/org/example/Simple.class");
    let mut buffer = BufferedReader::new(input);
    let mut constant_pool = ConstantPool::new();
    let cf = read_classfile(&mut buffer, &mut constant_pool).unwrap();

    println!("Class: {}", constant_pool.text_of(cf.this_class).unwrap());
    // print all methods and their instructions
    cf.methods.iter().for_each(|method| {
        let attr = method
            .attributes
            .iter()
            .find(|attr| matches!(attr, Attribute::Code(_)));
        println!("Name: {}()", method.name);

        let code = if let Attribute::Code(code) = attr.unwrap() {
            code
        } else {
            panic!("Code attribute not found");
        };

        // create a new buffer that contains just the code and nothing else...
        let mut code_reader = BufferedReader::new(&code.code);
        while !code_reader.has_remaining_data() {
            let opcode = code_reader.take::<u8>().unwrap();
            let instr =
                parse_instruction(opcode, &mut code_reader).expect("instruction should be parsed");
            println!("  0x{opcode:02x}: {}", instr);
        }
        println!();
    });
}

examples/printelements.rs (line 7)

fn main() {
    let input = include_bytes!("./testdata/org/example/Simple.class");
    let mut buffer = BufferedReader::new(input);
    let mut cp = ConstantPool::new();
    let cf = read_classfile(&mut buffer, &mut cp).unwrap();

    println!("Class name: {}", cp.text_of(cf.this_class).unwrap());

    cf.fields.iter().for_each(|field| {
        println!("Field {} - {}", field.name, field.descriptor);
    });

    // cf.methods.iter().for_each(|method| {
    //     let parameters: Vec<Descriptor> = method
    //         .descriptor
    //         .clone()
    //         .into_iter()
    //         .filter(|desc| desc.kind == DescriptorKind::Parameter)
    //         .collect();
    //     let return_ty: Descriptor = method
    //         .descriptor
    //         .clone()
    //         .into_iter()
    //         .find(|desc| desc.kind == DescriptorKind::Return)
    //         .unwrap_or(Descriptor {
    //             kind: DescriptorKind::Return,
    //             ty: FieldType::Base(BaseType::Void),
    //         });
    //
    //     println!(
    //         "{} {}({})",
    //         return_ty,
    //         method.name,
    //         parameters
    //             .iter()
    //             .map(|p| p.ty.to_string())
    //             .collect::<Vec<String>>()
    //             .join(", ")
    //     );
    // });
}

pub fn take<T>(&mut self) -> Result<T, BytecodeError>

where T: FromBytes,

Examples found in repository

examples/instructions.rs (line 31)

fn main() {
    let input = include_bytes!("./testdata/org/example/Simple.class");
    let mut buffer = BufferedReader::new(input);
    let mut constant_pool = ConstantPool::new();
    let cf = read_classfile(&mut buffer, &mut constant_pool).unwrap();

    println!("Class: {}", constant_pool.text_of(cf.this_class).unwrap());
    // print all methods and their instructions
    cf.methods.iter().for_each(|method| {
        let attr = method
            .attributes
            .iter()
            .find(|attr| matches!(attr, Attribute::Code(_)));
        println!("Name: {}()", method.name);

        let code = if let Attribute::Code(code) = attr.unwrap() {
            code
        } else {
            panic!("Code attribute not found");
        };

        // create a new buffer that contains just the code and nothing else...
        let mut code_reader = BufferedReader::new(&code.code);
        while !code_reader.has_remaining_data() {
            let opcode = code_reader.take::<u8>().unwrap();
            let instr =
                parse_instruction(opcode, &mut code_reader).expect("instruction should be parsed");
            println!("  0x{opcode:02x}: {}", instr);
        }
        println!();
    });
}

pub fn peek_bytes<T>(&self) -> Result<T, BytecodeError>

where T: FromBytes,

pub fn take_bytes(&mut self, length: usize) -> Result<&'a [u8], BytecodeError>

pub fn size(&self) -> usize

Returns the size of BufferedReader’s data in bytes.

pub fn position(&self) -> usize

Returns the current position of BufferedReader in bytes.

pub fn has_remaining_data(&self) -> bool

Indicates whether the reader has remaining data to be read.

Examples found in repository

examples/instructions.rs (line 30)

fn main() {
    let input = include_bytes!("./testdata/org/example/Simple.class");
    let mut buffer = BufferedReader::new(input);
    let mut constant_pool = ConstantPool::new();
    let cf = read_classfile(&mut buffer, &mut constant_pool).unwrap();

    println!("Class: {}", constant_pool.text_of(cf.this_class).unwrap());
    // print all methods and their instructions
    cf.methods.iter().for_each(|method| {
        let attr = method
            .attributes
            .iter()
            .find(|attr| matches!(attr, Attribute::Code(_)));
        println!("Name: {}()", method.name);

        let code = if let Attribute::Code(code) = attr.unwrap() {
            code
        } else {
            panic!("Code attribute not found");
        };

        // create a new buffer that contains just the code and nothing else...
        let mut code_reader = BufferedReader::new(&code.code);
        while !code_reader.has_remaining_data() {
            let opcode = code_reader.take::<u8>().unwrap();
            let instr =
                parse_instruction(opcode, &mut code_reader).expect("instruction should be parsed");
            println!("  0x{opcode:02x}: {}", instr);
        }
        println!();
    });
}

Trait Implementations

impl<'a> Clone for BufferedReader<'a>

fn clone(&self) -> BufferedReader<'a>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Debug for BufferedReader<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.