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RWoldbergandClaude Fable 5.1
a0c8a08020
The clean-room Canon CRW decoder written in LightCraft (crates/raw/src/vendor/crw.rs, crw_tables.rs, branch clean-room-crw-format-decode, revision 70c755e4) becomes the shared crate craft-crw: the CIFF heap container, the entropy coding derived by black-box analysis (frozen code tables for selectors 0-2), sensor black and white levels, as-shot white balance, orientation and the make/model/time records. Public types are the crate's own (Error, Limits, Cfa, Rect, BlackLevel, Header, Image); the capture time is handed on as Unix seconds so no calendar code lives here; LightCraft's shared plateau estimate is copied as saturation_plateau. Algorithm, tables and thresholds are unchanged. Tests: the ported synthetic round-trip, table-structure and hostile-input tests; a proptest mutation sweep (tests/robust.rs); and tests/samples.rs, which pins the eleven CC0 raw.pixls.us sample files (tests/samples.json: URL, SHA-256, licence) to the SHA-256 of the verified decode plus levels, white balance and metadata, so the port is proven byte-identical to the LightCraft decode without redistributing the reference TIFFs. scripts/fetch-crw-samples.py downloads the files outside the checkout; CRAFT_CRW_SAMPLES and CRAFT_CRW_ORACLE point the tests at them. The crate builds for wasm32. The whole derivation record (starting assumptions, plan with the maintainer's decisions, source log, container and payload notes, derivation log, frozen format, verification, colour/levels notes, private-corpus and chart notes, scripts, logs and the frozen table JSON) moves verbatim to crates/crw/clean-room/ with a README that indexes it and maps the LightCraft paths it cites; tools/gen_tables.py regenerates src/tables.rs from the JSON, byte for byte. Repository: .github/workflows/crw.yml (fmt, clippy, tests on Linux, Windows and macOS; wasm check; the sample-file job with cached downloads), README and ATTRIBUTION rows, NOTICE source provenance, docs/clean-room.md (the clean-room standard a format crate follows here), and AGENTS.md expanded with the start-of-session steps, the new-crate checklist, clean-room, assets and test rules; CLAUDE.md points at it. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>