feat: attrs() reports every attribute; unsigned arrays stay unsigned
attrs() silently omitted any attribute whose datatype had no AttrValue variant
— including every Python bool, which h5py stores as an enum — plus complex,
compound and reference attributes, and cast unsigned 64-bit arrays to
I64Array so values above i64::MAX came back negative.
- numpy/h5py-style booleans (an enum of exactly FALSE=0 / TRUE=1 over an
integer base) decode as I64 / I64Array of 0/1.
- AttrValue::U64Array keeps unsigned arrays unsigned. Behaviour change: an
unsigned array attribute no longer arrives as I64Array; the netCDF-4 CF
helpers (_FillValue, valid_range) and the Python bindings handle it.
- AttrValue::Raw { datatype, shape, data } carries any other attribute
verbatim (also used when a value fails to decode as its declared type), so
the attribute list is always complete. Decodable with data_read against the
datatype; Python receives {"dtype", "shape", "data"}.
- Both new variants are writable, so attributes round-trip between files.
h5py interop tests cover reading 13 attribute kinds and h5py reading back a
compound and a u64 attribute written by clawhdf5.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
This commit is contained in:
osobh
co-authored by
Claude Fable 5.1
Claude Fable 5.1
parent
5dd95a6cf8
commit
97ab658c11
@@ -163,13 +163,53 @@ pub(crate) fn attrs_to_map(
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) -> HashMap<String, AttrValue> {
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let mut map = HashMap::new();
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for attr in attrs {
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if let Some(val) = decode_attr_value(attr, file_data, offset_size, length_size) {
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map.insert(attr.name.clone(), val);
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}
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// Every attribute is reported. One that has no dedicated `AttrValue`
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// variant, or that fails to decode as its declared type, is returned
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// verbatim as `AttrValue::Raw` rather than dropped — a partial
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// attribute list with no indication anything is missing is worse than
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// an undecoded value.
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let val =
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decode_attr_value(attr, file_data, offset_size, length_size).unwrap_or_else(|| {
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AttrValue::Raw {
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datatype: attr.datatype.clone(),
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shape: attr.dataspace.dimensions.clone(),
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data: attr.raw_data.clone(),
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}
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});
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map.insert(attr.name.clone(), val);
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}
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map
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}
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/// `Some(values)` if `attr` is a numpy/h5py-style boolean: an enumeration over
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/// an integer base type whose members are exactly `FALSE` = 0 and `TRUE` = 1.
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/// This is how `attrs["flag"] = True` is stored. Reported as 0/1 integers.
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fn decode_bool_enum(attr: &clawhdf5_format::attribute::AttributeMessage) -> Option<Vec<i64>> {
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use clawhdf5_format::datatype::Datatype;
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let Datatype::Enumeration {
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base_type, members, ..
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} = &attr.datatype
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else {
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return None;
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};
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if members.len() != 2 {
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return None;
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}
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let member_value = |name: &str| {
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let m = members.iter().find(|m| m.name.eq_ignore_ascii_case(name))?;
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clawhdf5_format::data_read::read_as_i64(&m.value, base_type)
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.ok()?
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.first()
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.copied()
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};
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if member_value("FALSE")? != 0 || member_value("TRUE")? != 1 {
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return None;
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}
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let values = clawhdf5_format::data_read::read_as_i64(&attr.raw_data, base_type).ok()?;
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values.iter().all(|v| *v == 0 || *v == 1).then_some(values)
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}
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fn decode_attr_value(
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attr: &clawhdf5_format::attribute::AttributeMessage,
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file_data: &[u8],
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@@ -200,12 +240,7 @@ fn decode_attr_value(
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if vals.len() == 1 {
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Some(AttrValue::U64(vals[0]))
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} else {
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// No U64Array variant, store as I64Array.
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// NOTE: This cast is lossy for values > i64::MAX (bit 63 set).
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// Those values will appear as negative i64. A dedicated U64Array
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// variant would be needed to handle the full u64 range.
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let i64_vals: Vec<i64> = vals.iter().map(|&v| v as i64).collect();
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Some(AttrValue::I64Array(i64_vals))
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Some(AttrValue::U64Array(vals))
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}
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}
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Datatype::String { .. } => {
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@@ -228,6 +263,14 @@ fn decode_attr_value(
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Some(AttrValue::StringArray(strings))
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}
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}
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Datatype::Enumeration { .. } => {
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let vals = decode_bool_enum(attr)?;
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if vals.len() == 1 {
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Some(AttrValue::I64(vals[0]))
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} else {
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Some(AttrValue::I64Array(vals))
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}
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}
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_ => None,
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}
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}
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@@ -784,3 +784,132 @@ with h5py.File("links_{tag}.h5", "w"{kwargs}) as f:
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);
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}
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}
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// ---------------------------------------------------------------------------
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// Attribute fidelity: nothing is dropped, unsigned stays unsigned
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// ---------------------------------------------------------------------------
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/// `attrs()` used to omit, without any error, every attribute whose datatype
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/// had no `AttrValue` variant — including every Python `bool` (stored as an
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/// enum) — and to wrap unsigned 64-bit arrays into negative `i64`s.
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#[test]
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fn h5py_attribute_kinds_are_all_reported() {
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skip_if_no_python!();
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let dir = tempfile::tempdir().unwrap();
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let path = dir.path().join("attrs_kinds.h5");
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let path_str = path.display().to_string();
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let script = format!(
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r#"
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import h5py, numpy as np
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with h5py.File("{path_str}", "w") as f:
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d = f.create_dataset("d", data=np.arange(3))
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a = d.attrs
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a["float"] = 1.5; a["int"] = 7; a["str"] = "hello"; a["int_array"] = np.arange(4)
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a["str_list"] = ["a", "bc"]
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a["uint64_array"] = np.array([2**63, 1], dtype="u8")
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a["bool_true"] = True
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a["bool_false"] = False
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a["bool_array"] = np.array([True, False, True])
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a["complex"] = 1 + 2j
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a["compound"] = np.array([(1, 2.5)], dtype=[("a", "<i4"), ("b", "<f8")])
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a["object_ref"] = d.ref
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a["color"] = np.array(2, dtype=h5py.enum_dtype({{"RED": 0, "GREEN": 1, "BLUE": 2}}, basetype="i1"))
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print(len(a))
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"#
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);
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let written: usize = run_python_output(&script).trim().parse().unwrap();
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let file = File::open(&path).unwrap();
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let attrs = file.dataset("d").unwrap().attrs().unwrap();
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assert_eq!(
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attrs.len(),
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written,
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"every attribute is reported: {attrs:?}"
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);
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// Booleans decode as 0/1.
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assert!(matches!(attrs["bool_true"], AttrValue::I64(1)));
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assert!(matches!(attrs["bool_false"], AttrValue::I64(0)));
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assert!(matches!(&attrs["bool_array"], AttrValue::I64Array(v) if v == &[1, 0, 1]));
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// Unsigned stays unsigned.
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assert!(matches!(&attrs["uint64_array"], AttrValue::U64Array(v) if v == &[1u64 << 63, 1]));
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// A general enum is not a boolean: kept verbatim, member names intact.
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match &attrs["color"] {
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AttrValue::Raw { datatype, data, .. } => {
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assert_eq!(data, &[2]);
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assert!(format!("{datatype:?}").contains("BLUE"));
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}
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other => panic!("color: {other:?}"),
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}
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// A compound attribute is kept verbatim and decodes against its datatype.
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match &attrs["compound"] {
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AttrValue::Raw {
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datatype,
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shape,
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data,
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} => {
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assert_eq!(shape, &[1]);
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let fields = clawhdf5_format::data_read::read_compound_fields(data, datatype).unwrap();
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assert_eq!(fields[0].name, "a");
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let b =
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clawhdf5_format::data_read::read_as_f64(&fields[1].raw_data, &fields[1].datatype)
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.unwrap();
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assert_eq!(b, vec![2.5]);
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}
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other => panic!("compound: {other:?}"),
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}
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for name in ["complex", "object_ref"] {
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assert!(
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matches!(attrs[name], AttrValue::Raw { .. }),
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"{name}: {:?}",
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attrs[name]
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);
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}
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}
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/// `Raw` and `U64Array` are writable, so an attribute read from one file can
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/// be stored in another unchanged.
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#[test]
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fn clawhdf5_writes_raw_and_unsigned_attrs_h5py_reads() {
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skip_if_no_python!();
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let dir = tempfile::tempdir().unwrap();
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let src = dir.path().join("src.h5");
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let dst = dir.path().join("dst.h5");
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let (src_str, dst_str) = (src.display().to_string(), dst.display().to_string());
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run_python(&format!(
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r#"
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import h5py, numpy as np
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with h5py.File("{src_str}", "w") as f:
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d = f.create_dataset("d", data=np.arange(3))
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d.attrs["compound"] = np.array([(1, 2.5), (3, 4.5)], dtype=[("a", "<i4"), ("b", "<f8")])
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"#
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));
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let compound = File::open(&src)
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.unwrap()
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.dataset("d")
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.unwrap()
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.attrs()
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.unwrap()["compound"]
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.clone();
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let mut builder = FileBuilder::new();
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let ds = builder.create_dataset("d");
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ds.with_f64_data(&[1.0]);
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ds.set_attr("compound", compound);
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ds.set_attr("big", AttrValue::U64Array(vec![u64::MAX, 0, 1 << 63]));
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builder.write(&dst).unwrap();
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let out = run_python_output(&format!(
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r#"
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import h5py
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with h5py.File("{dst_str}", "r") as f:
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a = f["d"].attrs
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print(a["compound"].tolist(), a["compound"].dtype.names, a["big"].tolist(), a["big"].dtype)
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"#
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));
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assert_eq!(
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out.trim(),
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"[(1, 2.5), (3, 4.5)] ('a', 'b') [18446744073709551615, 0, 9223372036854775808] uint64"
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);
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}
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