deku's Introduction

Deku

Declarative binary reading and writing

This crate provides bit-level, symmetric, serialization/deserialization implementations for structs and enums

Why use Deku

Productivity: Deku will generate symmetric reader/writer functions for your type! Avoid the requirement of writing redundant, error-prone parsing and writing code for binary structs or network headers

Usage

[dependencies]
deku = "0.12"

no_std:

[dependencies]
deku = { version = "0.12", default-features = false, features = ["alloc"] }

Example

See documentation or examples folder for more!

Read big-endian data into a struct, modify a value, and write it

use deku::prelude::*;

#[derive(Debug, PartialEq, DekuRead, DekuWrite)]
#[deku(endian = "big")]
struct DekuTest {
    #[deku(bits = "4")]
    field_a: u8,
    #[deku(bits = "4")]
    field_b: u8,
    field_c: u16,
}

fn main() {
    let data: Vec<u8> = vec![0b0110_1001, 0xBE, 0xEF];
    let (_rest, mut val) = DekuTest::from_bytes((data.as_ref(), 0)).unwrap();
    assert_eq!(DekuTest {
        field_a: 0b0110,
        field_b: 0b1001,
        field_c: 0xBEEF,
    }, val);

    val.field_c = 0xC0FE;

    let data_out = val.to_bytes().unwrap();
    assert_eq!(vec![0b0110_1001, 0xC0, 0xFE], data_out);
}