osobhandClaude Opus 5.5
b41583113a
Every `u64 as usize` cast in clawhdf5-format (115 on wasm32) now goes through addr::to_usize for values read from the file — addresses, lengths, counts, dimensions: FormatError::Overflow where the value does not fit instead of wrapping onto another part of the file on a 32-bit target — or addr::saturating_usize for counts bounded by something in memory (codec progress counters, writer sizes), which fail a bounds check or allocation rather than wrap. A chunk whose offset does not fit lies outside the dataset and is skipped; partial reads treat such an offset as out of the buffers. On 64-bit targets nothing changes. scripts/check-32bit-casts.sh (run by ci-test.sh) lints the wasm32 build with clippy's cast_possible_truncation and fails on any u64 -> usize finding; before this commit it listed 115. 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