feat(rust): port double-fast block matching

Move the two-table fast match finder into Rust while retaining a small C
projection of the private match-state. The Rust implementation handles normal,
attached-dictionary, and external-dictionary matching without exposing the
full C context ABI. The C entry points and build-time exclusion guards remain
unchanged for configured consumers.

Document the migrated matcher in the Rust component map and narrow the
remaining-C boundary accordingly.

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 08:05:25 +02:00

parent d316a14ec3

commit f9adcf6aef

4 changed files with 1885 additions and 740 deletions

									
										rust/src/lib.rs
									
		+2
		
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				@@ -32,6 +32,8 @@ pub mod zstd_compress_superblock;

				#[cfg(feature = "decompression")]

				pub mod zstd_ddict;

				#[cfg(feature = "compression")]

				pub mod zstd_double_fast;

				#[cfg(feature = "compression")]

				pub mod zstd_fast;

				#[cfg(feature = "compression")]

				pub mod zstd_presplit;