osobhandClaude Opus 5.5
190918a478
libhdf5 serializes a VDS hyperslab as version 1 (irregular, 4-byte block corners) for the default format bounds, and as version 2 (regular, 8-byte) for unlimited selections in the 1.10 format. Only version 3 was accepted, so every h5py VDS written with default libver failed with "only version-3 hyperslab selections are supported" (5 libhdf5 test files in the sweep). Decode all three versions following H5S__hyper_deserialize, including irregular hyperslabs (a union of blocks, enumerated in row-major order as libhdf5 iterates them) and the all-ones "unlimited" count/block marker. SerializedSelection exposes the raw form for unlimited-mapping support. Test: vds_interop::vds_version1_irregular_hyperslab_selections compares default-libver h5py VDS reads (contiguous, strided and 2-D block mappings) with libhdf5's values. 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