v0.2.13

0.2.13

Added

• Read chunked datasets stored under every libhdf5 chunk index:
  Extensible Array (including paged data blocks), Fixed Array
  (including paged and filtered data blocks), version-1 B-tree
  (version-3 data layout), and version-2 B-tree of any depth
  (including filtered records).
• Read dense group links stored in a fractal heap, with
  direct-block checksum verification.
• SZIP / AEC filter: an in-crate codec that is byte-compatible
  with libaec / libhdf5 for both compression and decompression.
• N-bit and Scale-offset filters, with element-exact reads and
  post-filter datatype conversion for chunked datasets.
• Decode version-1 (as well as version-2) filter pipeline
  messages.
• Fill-value API: set_dataset_fill_value, with the version-3
  on-disk fill-value message layout. Unwritten and unallocated
  regions read back as the declared fill value.
• Group attributes and a group/root attribute API; read group
  and root attributes from legacy (version-0/1 superblock)
  files, including variable-length string attributes.
• Sub-frame chunking (chunks smaller than one frame).
• Compressed SWMR streaming datasets.
• Route multi-unlimited-dimension datasets to the version-2
  B-tree chunk index; route fixed-shape chunked datasets to the
  Fixed Array index; write filtered Fixed Array chunk indexes.
• Enumerate groups from link records rather than dataset path
  prefixes, so attribute-only and subgroup-only groups are
  discovered.

Fixed

• Fletcher-32 filter trailer endianness (UINT32ENCODE is
  little-endian).
• Extensible Array, Fixed Array, and version-2 B-tree on-disk
  byte layouts now match libhdf5; paged Extensible Array
  page-init bitmap indexing corrected.
• Version-3 fill-value message corrected to the real on-disk
  layout.
• Global-heap index exhaustion handled.
• Group discovery is cycle-safe and tolerant of stale links;
  open_append rejects unsupported version-0/1 superblocks
  with a clear error.

Hardening

• Unified the little-endian integer/address decoders behind
  clamped helpers (src/format/bytes.rs) so a short or
  malformed buffer cannot panic.
• Bounded every recursive parser against corrupt or adversarial
  input: v1 B-tree group traversal, group-link recursion,
  datatype nesting, and fractal-heap indirect-block nesting all
  carry depth and/or visited-set guards.
• Dataset and chunk byte-length computation uses saturating
  arithmetic; buffers sized from untrusted file fields are
  allocated with try_reserve so a crafted file yields a clean
  error instead of aborting the process.
• Hardened datatype, global-heap, and link-message parsing,
  chunk-index readers, Extensible/Fixed Array and v2 B-tree
  geometry, the Fixed Array writer, and the N-bit decoder
  against panics on malformed input.
• Verified against h5py 3.16 / libhdf5 2.0.0.