osobhandClaude Opus 5.5
989335b67b
parse_frame sized the offsets chunk from the frame header's own nbytes and chunksize, so a 173-byte frame declaring 32 Mi chunks, with a 40-byte repeated-value offsets chunk, built 256 MiB (up to 2 GiB) of offsets for a 1 MiB HDF5 chunk and then returned 4 bytes. The offsets chunk is now capped at the output limit (at least 128 bytes); a frame whose nbytes/chunksize imply more chunks than that is refused before anything is allocated. tests/blosc2_alloc_bounds.rs measures peak allocation with a counting global allocator; the reviewer's frame failed it (decoded Ok(4)) before. 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