Decode every raw encoding Panasonic and Leica bodies write, from the DMC-LX1 (2005) to the DC-S1RM2 (2025):
compressed formats 4 (most bodies, 2008-2022) and 6 (S1 / S1R / S1H / S5, GH5M2), the prefix-coded strips of
format 8 (GH6 and later), packed formats 2, 5 and 7, and the 16-bit words of the 2005-2007 .RAW files. Until now
only format 5 decoded; every other Panasonic file opened as preview only.
Clean-room: no raw-decoder source was read. Tag names come from tag documentation; every encoding was recovered
by black-box analysis of 178 CC0 files from raw.pixls.us (118 bodies), and the module docs note the measurement
that settled each rule. Format-8 tags of unknown meaning must carry the values every sample has, otherwise the file
is reported as unsupported rather than guessed at.
Levels and geometry: formats 4 and 6 store samples 15 above the recorded black level (files without one use 15);
white is the active area's saturation plateau (the linearity limits are wrong on extended low-ISO shots, the GF1
and the Digilux 3); the in-camera aspect ratio is the default crop; mapped-out defect pixels are filled from
same-colour neighbours; the CFA pattern applies at sample (0, 0).
.rwl and .raw files are imported (engine, MCP folder expansion, file dialog, Linux MIME types). One file per
encoding joins the never-panic proptest; 11 CC0 files join `cargo xtask corpus`, and corpus_panasonic_encodings
checks each encoding's bit depth, black level, crop and CFA layout against the camera's own JPEG.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QtQmZ6peZXGn3wiqeowV2v
- ljpeg: a scan naming an undefined Huffman table is an error, not an expect.
- ARW2/RW2 block reads use get() + try_from instead of slice + expect.
- Vendor fallback CFAs use Cfa::bayer_static (literal names, tested)
instead of Cfa::bayer(..).expect("static").
- dngwrite matches (data, compression) instead of a let-else unreachable!.
- lightcraft-raw and lightcraft-tiff now #![deny] unwrap/expect/panic/
unimplemented/todo/unreachable; clippy.toml (same as the steering PR)
keeps them allowed in tests.
- tests/vendor_robust.rs: synthetic NEF, ARW, PEF, SRW, ORF, RW2, CR2 and
RAF files, truncated at every length and randomly mutated, must decode
to an error, never panic (no new crash found).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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