osobhandClaude Opus 5.5
f7e2ab12f2
The editor stored every chunk through the whole pipeline with filter mask 0. For LZF that did not shrink a chunk, h5py instead stores it raw with the filter's mask bit set. A chunk the editor stored LZF-encoded at exactly the raw size was then rewritten raw by libhdf5 at the same size; libhdf5 does not touch the index entry when the size is unchanged, so the stale mask 0 stayed and h5py (and h5dump) could no longer read the dataset. clawhdf5_format::filters::compress_chunk_masked runs the pipeline as H5Z_pipeline does: an optional filter (H5Z_FLAG_OPTIONAL) that fails is skipped and its bit set, a mandatory one fails the write, and LZF/Blosc output no smaller than the input counts as failure, as in the reference filters (their output buffer is the input's size). Deflate, LZ4, Zstd, bitshuffle and bzip2 never fail on size in libhdf5 and are kept as before. Test: edit_interop optional_filters_that_fail_are_skipped — the reviewer's repro at every libver: the editor stores the chunk exactly as h5py does (mask 1, size 5; shuffle+LZF+fletcher32 mask 2), h5py r+ rewrites and extends the datasets, and h5py, h5dump and our reader read every value. Fails on the previous editor (mask 0; h5dump cannot read /u8). 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