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writer: track attribute creation order with track_order

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h5py's track_order=True orders attributes as well as links; the writer
tracked links only. A tracking object's header now sets the attribute
creation order tracked/indexed flags and carries per-message creation
orders, an Attribute Info message holds the next order (inline too),
and dense storage gets a type-9 creation-order index. The file default
applies to datasets, with DatasetBuilder::track_order per dataset; more
than 65 535 attributes on a tracking object is an error (libhdf5's
counter is 2 bytes). The reader lists such attributes in creation
order.

h5py lists them in order (inline, dense, 20 000 on one dataset) and
keeps numbering in r+ mode, including its inline-to-dense move.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
This commit is contained in:
osobh
2026-09-26 10:17:37 -05:00
co-authored by Claude Opus 5.5
parent d63c76e7ab
commit 193a5f8a82
9 changed files with 515 additions and 101 deletions
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crates/clawhdf5-tools/tests/h5rs_interop.rs
+6
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@@ -940,11 +940,17 @@ fn write_nested_links(dir: &Path) -> Vec<String> {
g.create_dataset(&format!("n{i:02}")).with_i32_data(&[i]);
}
g.add_hard_link("back", "/a/b/c");
// Attribute creation order tracked too: dense, with a type-9 index.
for i in (0..12).rev() {
g.set_attr(&format!("attr{i:02}"), AttrValue::I64(i));
}
b.add_group(g.finish());
let mut g = b.create_group("compact_ordered");
g.track_order(true);
g.create_dataset("z").with_i32_data(&[1]);
g.create_dataset("a").with_i32_data(&[2]);
g.set_attr("zz", AttrValue::I64(1));
g.set_attr("aa", AttrValue::I64(2));
b.add_group(g.finish());
let nested = dir.join("nested.h5");
b.write(&nested).unwrap();