Superblock::parse now refuses a user-block offset, and the raw read path
no longer guesses a VDS fill value. The probe looks at the file from the
superblock on and reads virtual datasets with vds::read_virtual_dataset,
the dataset's fill value and its source-derived extent.
Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
conformance/run.sh fetches eight public HDF5 corpora pinned by commit
(conformance/corpus.txt) into a gitignored cache, reads every file with
clawhdf5 (conformance/probe, a crate outside the workspace) and with
h5py/libhdf5 (ref.py), and the CVE files with h5dump, each under a timeout
and an address-space limit; compare.py classifies the files, report.py
writes CONFORMANCE.md and check.py gates on panics/hangs/crashes/OOM and on
regressions against conformance/baseline.json. ~25 s once cached.
Changes from the ad-hoc audit harness:
- the probe compares non-IEEE-layout floats (N-Bit) and integers with a bit
offset or reduced precision as the values libhdf5 converts them to, not
raw file bytes: 8 files that showed as mismatches now read identically;
- ref.py exits without tearing down h5py objects: libhdf5 2.0 aborts while
freeing them for two files about half the time, which flipped them
between ok and h5py-cannot-read from run to run;
- the file list is defined (list_files.py): netCDF classic files are left
out, 11 HDF5 files the ad-hoc sweep missed are in.
Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
