bitsandbytes 0.3.2

An owned, bit-aware binary codec: fast bit/byte field types and the unified #[bin] macro.
Documentation 
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//! `count_prefix` injects a *named* length field; a tuple variant's fields are
//! positional, so there is nowhere to put it — use a struct-style variant.
use bnb::bin;

#[bin]
enum Message {
    #[bin(magic = 0x01u8)]
    Data(#[brw(count_prefix = u8)] Vec<u8>),
    #[bin(magic = 0x02u8)]
    Ping { seq: u8 },
}

fn main() {}