crc-rust (Rust mirror of Nicoretti/crc)

Stage-1 Rust mirror of Nicoretti/crc (BSD-2-Clause, original by Nicola Coretti). Behavior-identical port of src/crc/_crc.py exposed as the crc._crc extension module via PyO3, with thin crc/__init__.py + crc/__main__.py re-export shims preserving the original public API (Calculator, Register, TableBasedRegister, Crc8/16/32/64, create_lookup_table, main, ...).

Layout (publishable)

One implementation, two distributions:

• crc-core/ — reusable pure-Rust core crate crc-rust-core (crates.io). No Python dependency: rlib, cargo test clean, miri-clean. Rust consumers depend on this crate directly.
• src/lib.rs — thin PyO3 binding crate crc-rust calling that same core. Ships on PyPI as distribution crc-rust; the import name is unchanged (import crc), so users swap the install with zero code changes: pip install crc-rust instead of pip install crc.
• crc/ — Python shims (__init__.py, __main__.py).
• release.toml — release configuration (names, version, platforms, Python versions, publishing repo + workflow identity, license, upstream attribution). Read by rustsmith release-prep; see docs/RELEASE.md.

No redesign: byte-at-a-time table lookup ships, same as the original. Slice-by-8/16 is a Stage-2 optimization candidate, not part of the mirror.

Install

pip install crc-rust        # Python (import crc)
cargo add crc-rust-core     # Rust

Release

Publishing is a manual step after review; rustsmith never pushes. Prepare and verify everything locally, then follow the generated setup instructions:

rustsmith release-prep --project mirror/crc --fork <fork> --opt <opt> \
  --recon-out <recon> --out <dist>

See docs/RELEASE.md (releasing converted projects) and the generated TRUSTED_PUBLISHING_SETUP.md in the output directory.