An owned, bit-aware binary codec for Rust — integer-backed bitfields, arbitrary-width integers (u1..u127), enums, and the unified #[bin] whole-message codec, with a no_std core. Published as bitsandbytes but imported in code as bnb:

[dependencies]
bnb = { package = "bitsandbytes", version = "0.1" }

use bnb::{bin, bitfield, BitEnum};

It collapses the capabilities of modular-bitfield/bitbybit/arbitrary-int/num_enum plus a declarative codec (modeled on binrw) into one crate. See:

• bnb/README.md — the crate overview and quick start.
• bnb/DESIGN.md — design rationale.
• bnb/ROADMAP.md — status and capabilities.
• the in-crate guide module (cargo doc --open) — runnable, doctested walkthroughs.

no_std: build with --no-default-features (always needs alloc); the default std feature adds the std::io ladder and encode(writer) conveniences.

See CONTRIBUTING.md for how contributions work (and the local checks that mirror CI), and SECURITY.md to report a vulnerability.

Dual-licensed under either of MIT or Apache-2.0 at your option.