ucobs/CHANGELOG.md

Changelog

0.3.0 — 2026-03-31

Performance

• Encode nonzero/mixed: ~2x faster — uses const copy_from_slice (memcpy at runtime) via Rust 1.93's stabilization of const slice methods. Sub-slice scan pattern helps LLVM eliminate bounds checks.
• Encode zeros: ~50% faster — fast path skips scan loop overhead for leading zero bytes.
• Decode zeros: ~4x faster — batch consecutive 0x01 codes and fill zeros via fill(0) (memset) instead of per-byte iteration.
• Encode now wins or ties corncobs on nonzero/mixed workloads.
• Decode zeros now leads all competitors by 3x.

Added

• legacy-msrv feature flag — enables compilation on Rust 1.83+ (e.g. Xtensa toolchain) by replacing const copy_from_slice with a manual byte loop. All other optimizations (sub-slice scan, zero fast path, decode batch fill) work without this feature on any supported Rust version.

Changed

• MSRV bumped from 1.83 to 1.93 — required for const copy_from_slice. Use the legacy-msrv feature for older toolchains.
• Dev-dependencies updated: cobs 0.3 to 0.5, criterion 0.5 to 0.8, rand 0.8 to 0.10.

0.2.0 — 2026-03-30

Added

• const fn encode — encode data at compile time with zero runtime cost.
• Comprehensive documentation with 7 usage examples (basic, buffer sizing, framing, stream parsing, compile-time encoding, error handling).
• Initial encode/decode throughput optimizations.

Changed

• MSRV set to 1.83.

0.1.0 — 2026-03-29

• Initial release.
• no_std, zero-alloc, unsafe-free COBS encoder and decoder.
• 106 tests: canonical vectors, property-based (proptest), fuzz targets, cross-crate interop with corncobs and cobs.