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feat(compress): move CCtx reset planning into Rust

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Move the scalar planning portion of ZSTD_resetCCtx_internal across an
explicit C/Rust boundary. Rust now computes window and block sizes, sequence
capacities, buffered I/O sizes, LDM and external-sequence reservations, the
index-reset policy, and the CCtx workspace estimate. C retains private
workspace resizing, reservations, pointer publication, and layout-dependent
callbacks.

Add ABI layout assertions and focused planner tests for buffered sizing, LDM
and index-reset policy, external sequence capacity, and invalid unadjusted LDM
inputs. Keep the migration boundary documented so the hybrid state remains
explicit while deeper CCtx reset and matchfinder operations stay in C.

Test Plan:
- `cargo fmt --manifest-path rust/Cargo.toml -- --check`
- capped focused planner tests: 3 passed
- capped full Rust library tests: 680 passed, 0 failed
- capped `cargo clippy --manifest-path rust/Cargo.toml --all-targets -- -D warnings`: passed
- capped native `make -B -C programs -j1 zstd`: passed; only known fileio const-cast warnings
- capped `make -C tests -j1 test-zstream ZSTREAM_TESTTIME=-T1s`: 84 tests and both short fuzzer rounds passed; only known zstream initializer warning
This commit is contained in:
ddidderr
2026-07-19 17:56:41 +02:00
parent 127dd21195
commit 853792f2c4
3 changed files with 441 additions and 31 deletions
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rust/README.md
+4 -3
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@@ -167,9 +167,10 @@ static-CDict workspace construction and dictionary-content allocation/loading,
and advanced-CDict dictionary-content loading remain in C. Rust now owns
advanced-CDict custom-memory validation, workspace-size query/allocation,
allocation/create/init cleanup ordering, the CCtx workspace-size formula, and
the match-state reset policy/order; C retains private layout-size inputs,
workspace layout, and allocator callbacks. Private CCtx reset/matchfinder/
workspace operations and codec/adaptive-policy
the scalar CCtx-reset plan and match-state reset policy/order; C retains
private layout-size inputs, workspace resize/layout, private field publication,
and allocator callbacks. Private CCtx reset/matchfinder/workspace operations
and codec/adaptive-policy
callbacks remain in C. CDict initialization ordering and scalar publication,
shared compression-begin dictionary selection, CDict reset attach-versus-copy
selection, and CDict-begin parameter selection, initialization ordering, and