osobhandClaude Opus 5.5
10da8f0d09
In a file with sizeof_addr = 4, a VL string attribute came back as AttrValue::Raw, a compound's VL member failed with GlobalHeapObjectNotFound and VL datasets failed with a size mismatch. Two bugs: Datatype::type_size() said 16 for every VL type, while the element is 4 + offset size + 4 bytes (12 here); and the global heap was parsed without the padding libhdf5 puts after its collection and object headers (both round up to 8), so with 4-byte lengths every object was looked up 4 bytes early. Datatype::VariableLength now carries the size its datatype message stores, and writes it back. Checked against h5py in tests/vl_offset4_interop.rs (fails with either fix reverted). Conformance unchanged at 575 of 697; in cve-2024-32608 a VL attribute whose datatype claims 524304-byte elements is now an error (h5py cannot iterate those attributes at all). 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