Follow-up to the v5 compound fix, found by an interop sweep over diverse
h5py/HDF5 2.0 (libver=latest) datasets:
- Array datatype (class 10) version 5 was rejected. v3/v4/v5 share the same
array encoding, so the parser now accepts 3-5.
- Data Layout message version 5 was rejected, which broke EVERY chunked/
compressed dataset written by modern HDF5. v5 reuses the v4 message
structure, so it now routes through parse_v4.
Validated end-to-end: a gzip-compressed, Fixed-Array-indexed v5 chunked dataset
now decodes to the correct values. Adds h5py-free regression tests using the
real v5 array-datatype and chunked-layout bytes, and updates the layout
invalid-version test to use v6.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
clawhdf5 rejected datatype message version 5 for the compound class with
"invalid datatype version 5 for class 6", so it could not read compound
datasets written by modern HDF5 / h5py with libver=latest. v5 reuses the same
compact member encoding as v3/v4 (name, variable-width offset, member type), so
the parser now accepts versions 3-5 for compound.
Found by running the previously-ignored h5py interop tests against h5py 3.16 /
HDF5 2.0. Adds an h5py-free regression test using the real v5 datatype bytes.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
build_chunked_data_at_ext now compresses all chunks via compress_all_chunks
(previously dead code) before laying them out, so compression runs across
rayon threads under the `parallel` feature when there are >4 filtered chunks.
Layout is unchanged — compression preserves chunk order, so on-disk bytes are
identical to the sequential path. The agent crate enables `parallel`, so this
speeds up compressed embedding writes.
Removes the #[allow(dead_code)] on compress_all_chunks and gates
PARALLEL_COMPRESS_THRESHOLD behind the `parallel` feature.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
