feat(rust): port compressed block decoding

Move literal decoding, sequence-table construction, FSE sequence decoding, and
sequence execution into Rust. The C shim retains ownership of the configured
decoder context and passes only the leaf state needed by the block codec.

Correct the two high offset-code bases while porting the tables. Their prior
values made valid large-window streams decode as corrupted data; the new unit
test fixes the exact values and a native zstream regression exercises them.
High-level frame and streaming context control remains C for now.

Test Plan:
- cargo test --all-targets
- cargo test --target i686-unknown-linux-gnu --all-targets
- cargo clippy && cargo clippy --benches && cargo clippy --tests
- cargo +nightly fmt
- make -B -C tests -j2 fuzzer zstreamtest invalidDictionaries poolTests
- ./tests/fuzzer -s5346 -i1 --no-big-tests
- ./tests/zstreamtest -i3000 -s334462
- ./tests/invalidDictionaries
- timeout 20s stdbuf -oL ./tests/poolTests

Refs: rust/README.md

This commit is contained in:

ddidderr

2026-07-11 08:07:40 +02:00

parent 7f16a07375

commit e5eebd4892

4 changed files with 1823 additions and 2168 deletions

									
										rust/src/lib.rs
									
		+2
		
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				@@ -31,6 +31,8 @@ pub mod zstd_compress_sequences;

				pub mod zstd_compress_superblock;

				#[cfg(feature = "decompression")]

				pub mod zstd_ddict;

				#[cfg(feature = "decompression")]

				pub mod zstd_decompress_block;

				#[cfg(feature = "compression")]

				pub mod zstd_double_fast;

				#[cfg(feature = "compression")]