Move the per-block body of ZSTD_compressSequences_internal behind an explicit
Rust projection. The C wrapper still owns context initialization, public API
validation, frame headers, checksums, and the private CCtx layout. Rust now
owns block sizing and sequence transfer, sequence-store reset, entropy
compression, raw/RLE/compressed block selection, block headers, repcode/state
swapping, repeat-mode transition, and first-block handling.
The bridge passes only the sequence store, block-state pointer slots, workspace,
policy scalars, dictionary size, and the isFirstBlock slot. It does not pass a
CCtx or C callback across the ABI. The tests cover empty-block headers,
capacity errors, first-block RLE restrictions, and entropy fallback decisions.
Test Plan:
- cargo test --manifest-path rust/Cargo.toml --lib zstd_compress -- --test-threads=1
- cargo clippy --manifest-path rust/Cargo.toml --lib -- -D warnings
- cargo +nightly fmt --manifest-path rust/Cargo.toml -- --check
- cargo test --manifest-path rust/Cargo.toml --lib -- --test-threads=1
- make -B -C lib -j2 lib
- make -B -C tests -j2 test-cli-tests
- ZSTREAM_TESTTIME=-T2s make -B -C tests -j2 test-zstream
- FUZZERTEST=-T5s make -C tests -j2 test-fuzzer (covers ZSTD_compressSequences at fuzzer test 190)
- git diff --cached --check
ddidderr
20db5861e5