feat(rust): port FSE entropy decoding

Move FSE normalized-count parsing, Huffman statistics decoding, FSE table
construction, and FSE stream decompression into Rust. The C source files now
only retain the headers needed by the existing build configuration.

The implementation keeps the public C ABI and verifies C-generated balanced,
skewed, and Huffman-statistics streams. Compression and the higher-level frame
decoder remain C for now.

Test Plan:
- cargo fmt --check
- cargo test --all-targets
- cargo clippy --all-targets -- -D warnings
- cargo build --release
- compile both C shims with -Werror and -Wredundant-decls

Refs: rust/README.md

This commit is contained in:

ddidderr

2026-07-10 20:04:26 +02:00

parent 554a30da41

commit a0f2b2a14c

6 changed files with 1264 additions and 652 deletions

									
										rust/src/lib.rs
									
		+2
		
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				@@ -5,7 +5,9 @@ pub mod bitstream;

				pub mod common;

				pub mod cpu;

				pub mod debug;

				pub mod entropy_common;

				pub mod errors;

				pub mod fse_decompress;

				pub mod mem;

				pub mod xxhash;

				pub mod zstd_common;