feat(rust): port FSE compression primitives

Move FSE normalization, count-header writing, compression-table construction,
and stream encoding from C to Rust. The original C source remains as a
header-only shim, preserving the public header configuration while native
consumers receive the Rust archive exports.

This completes both codec directions for FSE in the migration crate and lets
the unchanged C compatibility tests exercise the Rust encoder implementation.

Test Plan:
- cargo clippy; cargo clippy --benches; cargo clippy --tests
- cargo +nightly fmt, then repeat the Clippy checks
- cargo test --all-targets
- cargo build --release
- Compile the C shim with strict warnings enabled
- 1,000-case pristine-C differential for tables, headers, and payloads
- ./tests/fuzzer -v -T10s
- ./tests/decodecorpus -t -T5

Refs: rust/README.md

This commit is contained in:

ddidderr

2026-07-10 20:32:18 +02:00

parent ebc43676b7

commit 5f9d607ddd

4 changed files with 1089 additions and 622 deletions

									
										rust/src/lib.rs
									
		+1
		
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				@@ -7,6 +7,7 @@ pub mod cpu;

				pub mod debug;

				pub mod entropy_common;

				pub mod errors;

				pub mod fse_compress;

				pub mod fse_decompress;

				pub mod hist;

				pub mod mem;