osobhandClaude Opus 5.5
17201e279d
libhdf5 allocates an implicit index's chunks for the whole maximum extent and places chunk `scaled` at its row-major position in the maximum chunk grid (H5D__none_idx_get_addr, max_down_chunks). The reader used the current grid, so a dataset below its maximum shape with more chunk columns at its maximum read other chunks' values from the second chunk row on (h5py early allocation, fixed maxshape). generate_implicit_chunks_in_grid takes the maximum dimensions; generate_implicit_chunks keeps its signature (grid = current extent). Regression: implicit_chunks_use_the_maximum_grid here, and implicit_index_below_its_maximum_reads_like_libhdf5 (h5py file) with the editor tests. 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