osobhandClaude Opus 5.5
36356ba8a1
Compound datatype version 1 carries, per member, a dimensionality and four dimension sizes (HDF5 before 1.4 had no array class). The parser skipped those 28 bytes, so a member such as `f: f32[4]` came back as a single f32 at the member's offset: the compound's size was right but its members were wrong. libhdf5 wraps such a member in an array type of the first `dimensionality` sizes and ignores the permutation; do the same, and reject a dimensionality above 4 as libhdf5 does. Only files old enough to also use layout message v1 have these, so this became reachable with the previous commit (tarrold.h5, tcompound.h5). 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