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pub const MSG_ID_MAX: u8 = 0x7F;

#[repr(C)]
#[derive(Clone)]
pub struct Header {
    pub msg_id: u8,
    pub(crate) _pad: u8,
    pub slot_2_offset: u16,
}

// GRCOV_EXCL_START
impl std::fmt::Debug for Header {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("Header")
            .field("msg_id", &self.msg_id)
            .field("slot_2_offset", &self.slot_2_offset)
            .finish()
    }
}
// GRCOV_EXCL_STOP

#[cfg(test)]
mod tests {
    use std::mem::offset_of;
    use std::mem::size_of;

    use super::*;

    #[test]
    #[cfg_attr(miri, ignore)]
    fn test_size() {
        assert_eq!(4, size_of::<Header>());
        assert_eq!(0, offset_of!(Header, msg_id));
        assert_eq!(2, offset_of!(Header, slot_2_offset));
    }
}