osobhandClaude Opus 5.5
8c3ef996ea
FillTime::to_byte had the fill-time field rotated against libhdf5 (H5D_FILL_TIME_ALLOC = 0, NEVER = 1, IFSET = 2): Never was written as ALLOC, Alloc as IFSET and IfSet as NEVER, as h5py reported. The flags byte is now late allocation plus the right code, and FillTime::from_byte decodes it. The default becomes IfSet, which is libhdf5's default and exactly the byte (0x0a) every dataset was already written with, so default output does not change; `Alloc` was documented as the C library's default but never was. DatasetCreateProps follows. DatasetBuilder::with_fill_value sets a user-defined fill value (one element's stored bytes, checked against the datatype size), written as a defined value in the fill value message. h5py reports it, and extending the dataset in h5py fills the new elements with it. 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