deku 0.20.3

bit level serialization/deserialization proc-macro for structs
Documentation 
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#[cfg(feature = "bits")]
mod test_pad_bits_after;
#[cfg(feature = "bits")]
mod test_pad_bits_before;
mod test_pad_bytes_after;
mod test_pad_bytes_before;

#[cfg(feature = "bits")]
#[cfg(test)]
mod test {
    use core::convert::{TryFrom, TryInto};

    use deku::prelude::*;
    #[test]
    #[allow(clippy::identity_op)]
    fn test_pad_bits_before_and_pad_bytes_before() {
        #[derive(PartialEq, Debug, DekuRead, DekuWrite)]
        struct TestStruct {
            #[deku(bits = 2)]
            field_a: u8,
            #[deku(pad_bits_before = "5 + 1", pad_bytes_before = "0 + 1")]
            field_b: u8,
        }

        let data: Vec<u8> = vec![0b10_000000, 0xaa, 0xbb];

        let ret_read = TestStruct::try_from(data.as_slice()).unwrap();

        assert_eq!(
            TestStruct {
                field_a: 0b10,
                field_b: 0xbb,
            },
            ret_read
        );

        let ret_write: Vec<u8> = ret_read.try_into().unwrap();
        assert_eq!(vec![0b10_000000, 0x00, 0xbb], ret_write);
    }

    #[test]
    fn test_pad_bits_after_and_pad_bytes_after() {
        #[derive(PartialEq, Debug, DekuRead, DekuWrite)]
        struct TestStruct {
            #[deku(bits = 2, pad_bits_after = "6", pad_bytes_after = "1")]
            field_a: u8,
            field_b: u8,
        }

        let data: Vec<u8> = vec![0b10_000000, 0xaa, 0xbb];

        let ret_read = TestStruct::try_from(data.as_slice()).unwrap();

        assert_eq!(
            TestStruct {
                field_a: 0b10,
                field_b: 0xbb,
            },
            ret_read
        );

        let ret_write: Vec<u8> = ret_read.try_into().unwrap();
        assert_eq!(vec![0b10_000000, 0x00, 0xbb], ret_write);
    }
}