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fix(format): write a Group Info message in every group

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libhdf5 reads a group's Group Info message before it inserts a link, and
FileWriter wrote none, so h5py in "r+" mode could not add a link to any
group we wrote: "Unable to create link (message type not found)". Each
group header now carries a version 0 Group Info message with the default
link-phase thresholds, as libhdf5 writes for a new group.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
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osobh
2026-09-26 08:08:31 -05:00
co-authored by Claude Opus 5.5
parent 63648c7000
commit 8cbbef3fae
3 changed files with 152 additions and 0 deletions
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CHANGELOG.md
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@@ -2,6 +2,15 @@
## Unreleased
### Writer: groups and links (2026-09-26)
- **libhdf5 could not add links to groups we wrote.** h5py in `"r+"` mode
failed with "Unable to create link (message type not found)" on every
group `FileWriter` wrote: libhdf5 reads a group's Group Info message before
inserting a link, and none was written. Every group now carries one
(version 0, default thresholds: 6 more bytes per group header, so files
are not byte-identical to earlier versions). Regression test:
`crates/clawhdf5/tests/writer_groups_interop.rs`.
### Plugin filters (2026-09-26)
- **LZF, bitshuffle, bzip2 and Blosc read and write, in pure Rust.** Files
written by h5py with `compression="lzf"`, or with hdf5plugin's