osobhandClaude Opus 5.5
04a7f6f6c7
A valid group has one link per name, but a damaged or hand-made one can have two. resolve_child followed the first soft link of the name, the listing skipped a dangling one and listed the name via a later link, and path resolution followed the last symbolic link: three answers. All now take the first link of the name (header message order in a compact group, name index order in a dense one) and ignore the rest, even if the first dangles. That is libhdf5's rule for compact groups (H5G__compact_lookup stops at the first Link message); h5py opens nothing for a dangling first link although a later one resolves. For a dense group libhdf5 binary-searches the index and may land on another of several exact duplicates; documented on first_link_named. find_symbolic_link's v2 branch was dead (only v1 groups reach it) and is now v1-only. Test: an h5py compact group with soft links dup_A (dangling, or to /d) and dup_B (the other), dup_B renamed to dup_A in the header and re-checksummed. Lookup, path and listing through all three readers match h5py for both orders. With the old group_v2.rs the path lookup returned 42 where h5py opens nothing. Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
clawhdf5-format
Pure-Rust HDF5 binary format parsing and writing — no C dependencies.
Features
- Zero-copy superblock, object header, and B-tree parsing
- Chunked dataset read/write with filter pipelines
no_stdsupport (disablestdfeature)- Optional parallel reads via Rayon
- SHA-256 provenance tracking
Usage
use clawhdf5_format::Superblock;
let data = std::fs::read("data.h5").unwrap();
let sb = Superblock::from_bytes(&data).unwrap();
println!("HDF5 version {}.{}", sb.version_major(), sb.version_minor());
License
MIT