deku 0.20.3

bit level serialization/deserialization proc-macro for structs
Documentation 
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#![cfg(all(feature = "bits", feature = "std"))]

use deku::noseek::NoSeek;
use deku::prelude::*;
use std::io::{Cursor, Seek};

#[test]
fn test_from_reader_struct() {
    #[derive(Debug, PartialEq, DekuRead, DekuWrite)]
    struct TestDeku(#[deku(bits = 4)] u8);

    let test_data: Vec<u8> = [0b0110_0110u8, 0b0101_1010u8].to_vec();
    let mut c = Cursor::new(test_data);

    c.rewind().unwrap();
    let (amt_read, ret_read) = TestDeku::from_reader((&mut c, 0)).unwrap();
    assert_eq!(amt_read, 4);
    let mut total_read = amt_read;
    assert_eq!(TestDeku(0b0110), ret_read);

    c.rewind().unwrap();
    let (amt_read, ret_read) = TestDeku::from_reader((&mut c, total_read)).unwrap();
    assert_eq!(amt_read, 8);
    total_read = amt_read;
    assert_eq!(TestDeku(0b0110), ret_read);

    c.rewind().unwrap();
    let (amt_read, ret_read) = TestDeku::from_reader((&mut c, total_read)).unwrap();
    assert_eq!(amt_read, 12);
    total_read = amt_read;
    assert_eq!(TestDeku(0b0101), ret_read);

    c.rewind().unwrap();
    let (amt_read, ret_read) = TestDeku::from_reader((&mut c, total_read)).unwrap();
    assert_eq!(amt_read, 16);
    assert_eq!(TestDeku(0b1010), ret_read);

    let inner = &c.into_inner();
    let mut s = NoSeek::new(inner.as_slice());
    let (amt_read, ret_read) = TestDeku::from_reader((&mut s, 0)).unwrap();
    assert_eq!(amt_read, 4);
    assert_eq!(TestDeku(0b0110), ret_read);
}

#[test]
fn test_from_reader_enum() {
    #[derive(Debug, PartialEq, DekuRead, DekuWrite)]
    #[deku(id_type = "u8", bits = 4)]
    enum TestDeku {
        #[deku(id = "0b0110")]
        VariantA(#[deku(bits = 4)] u8),
        #[deku(id = "0b0101")]
        VariantB(#[deku(bits = 2)] u8),
    }

    let test_data = [0b0110_0110u8, 0b0101_1010u8];
    let mut c = Cursor::new(test_data);

    let (first_amt_read, ret_read) = TestDeku::from_reader((&mut c, 0)).unwrap();
    assert_eq!(first_amt_read, 8);
    assert_eq!(TestDeku::VariantA(0b0110), ret_read);
    c.rewind().unwrap();

    let (amt_read, ret_read) = TestDeku::from_reader((&mut c, first_amt_read)).unwrap();
    assert_eq!(amt_read, 6 + first_amt_read);
    assert_eq!(TestDeku::VariantB(0b10), ret_read);

    c.rewind().unwrap();
    let inner = &c.into_inner();
    let mut s = NoSeek::new(inner.as_slice());
    let (_amt_read, ret_read) = TestDeku::from_reader((&mut s, 0)).unwrap();
    assert_eq!(first_amt_read, 8);
    assert_eq!(TestDeku::VariantA(0b0110), ret_read);
}