Read HDF5 1.6-era files, user blocks, VDS, dense attributes and large groups #13

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osobh merged 28 commits from fix/p1-read-gaps into main 2026-09-26 09:42:10 +00:00
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@@ -296,6 +296,14 @@
- CI keeps zlib-ng building and tested; the arm64 job no longer needs cmake.
### Correctness
- `clawhdf5-format` VDS: variable-length and reference data from a source in
another file is refused. Those elements are global-heap IDs and object
addresses in the source file; copied into the virtual dataset they would
be decoded against the wrong file and name another object.
- `clawhdf5-agent`: a store whose `/meta` has an attribute that cannot be
decoded fails to open (`MemoryError::Schema`). With `attrs()` now leaving
unreadable attributes out, it would otherwise have opened with defaults in
place of its settings (`float16`, `compression`, the WAL mark, ...).
- `clawhdf5-format` reader: an old-style group whose local heap has a free
list pointing outside the heap was listed with names read from the broken
heap (garbage names on `cve-2021-36977.h5` once its user block was