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docs: ZFP reads (changelog, README feature table, known issues)

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ZFP (32013) was the one plugin filter still listed as UnsupportedFilter.
Conformance on tank, `conformance/run.sh --no-fetch` (2026-09-26): 600 of
697 files ok (baseline 599); h5ex_d_zfp.h5 is newly ok.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
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osobh
2026-09-26 13:08:47 -05:00
co-authored by Claude Opus 5.5
parent d97b3d703a
commit 2b7065998a
4 changed files with 38 additions and 10 deletions
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README.md
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@@ -780,14 +780,14 @@ stores keep their setting. Opt out with `float16 = false` or
| `bzip2` | no | bzip2 filter (id 307): read and write. Pure Rust (the `bzip2` crate's libbz2-rs-sys backend compiles no C) |
| `blosc` | no | Blosc 1 filter (id 32001): reads BloscLZ, LZ4/LZ4HC, Snappy, Zlib and Zstandard frames with byte or bit shuffle; writes LZ4, Snappy, Zlib or Zstandard (not BloscLZ). Pure Rust |
| `blosc2` | no | Blosc2 filter (id 32026), read only: hdf5plugin's frames and B2ND (n-D) chunks, BloscLZ, LZ4/LZ4HC, Zlib and Zstandard, with shuffle, bit shuffle, delta or truncated precision. Pure Rust |
| `plugin-filters` | no | All five above |
| `zfp` | no | ZFP filter (id 32013, H5Z-ZFP), read only: every mode (rate, precision, accuracy, reversible, expert) for int32, int64, float and double, 1-4-D, returning exactly libzfp's values. Pure Rust, no dependencies |
| `plugin-filters` | no | All six above |
ZFP (32013) is not implemented: reading it fails with `UnsupportedFilter`,
whose message names the filter. clawhdf5 cannot write Blosc2. Any other
clawhdf5 cannot write Blosc2 or ZFP. Any other
filter can be supplied at run time with `filter_registry::register_filter` (a
decoder closure, or a `FilterCodec` that also encodes). The facade
(`clawhdf5`) forwards `lzf`, `bitshuffle`, `bzip2`, `blosc`, `blosc2` and
`plugin-filters`. Write
(`clawhdf5`) forwards `lzf`, `bitshuffle`, `bzip2`, `blosc`, `blosc2`, `zfp`
and `plugin-filters`. Write
with `DatasetBuilder::with_lzf()`, `with_bitshuffle(..)`, `with_bzip2(..)`
and `with_blosc(..)`; h5py + hdf5plugin read the result (tested both ways in
`crates/clawhdf5/tests/plugin_filters_interop.rs`). The pure-Rust Zstandard