feat(format): bzip2 filter (307), read and write, pure Rust

hdf5plugin's BZip2 failed with UnsupportedFilter(307). The new `bzip2`
feature decodes the single bzip2 stream H5Zbzip2.c stores, bounded by the
chunk size (a truncated stream is an error, not short data), and encodes
at block size cd_values[0] (DatasetBuilder::with_bzip2(level)). It uses the
bzip2 crate's default backend, libbz2-rs-sys, a pure-Rust port of
libbzip2: `cargo tree` shows no cc/cmake, and nothing is compiled from C.

Interop: hdf5plugin writes block sizes 9, 1 and 5+shuffle over the
12-case matrix, read byte for byte; ours at 9 (shuffled) and 1 (not)
reads back through hdf5plugin. Both fail with the decoder removed.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

This commit is contained in:

osobh

2026-09-26 00:05:26 -05:00

co-authored by

Claude Opus 5.5

parent 07094e34a9

commit 6dfd239011

8 changed files with 178 additions and 2 deletions

									
										crates/clawhdf5-format/src/lib.rs
									
		+2
		
												View File
												
				@@ -75,6 +75,8 @@ pub mod filter_registry;

				pub mod filters;

				#[cfg(feature = "bitshuffle")]

				mod filters_bitshuffle;

				#[cfg(feature = "bzip2")]

				mod filters_bzip2;

				#[cfg(feature = "lzf")]

				pub mod filters_lzf;

				mod filters_szip;