osobhandClaude Opus 5.5
d493d4792e
File, MmapFile and LazyFile decoded the superblock extension and laid a metadata cache image over the file's metadata; the other readers did not, so the same file read differently by entry point: NativeVol, AsyncHDF5File and MpiVol (clawhdf5-io) and the external source files of a virtual dataset (clawhdf5-format vds.rs) read a file with an image from its own bytes, which libhdf5 does not (they may be stale, or zeros: h5clear_mdc_image.h5 failed with InvalidObjectHeaderVersion(0)), and skipped the extension checks File::open makes (cve-2020-10810/10812). Each of them owns its buffer, so each now calls the shared superblock_ext::apply_cache_image_in_place, which checks the extension and writes the image's entries in place (only the image block is copied). These readers read whole datasets and cannot open a file and fail each object, so an image libhdf5 cannot load is refused with the image's error, never read around. clawhdf5-io's vol::load_hdf5 wraps it for NativeVol (at open; for from_bytes the error is reported on read, as a truncated file already was) and MpiVol. The MpiVol edit is minimal and was not compiled: the mpi-io feature needs an MPI installation this machine does not have (mpi-sys's build script panics). Tests: NativeVol (open_path and from_bytes), AsyncHDF5File and a VDS whose source file is h5clear_mdc_image.h5 (vds_interop.rs, against h5py) read the fixture's values; the corrupted-image variants are refused. Each fails without its fix. 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