feat(rust): port decode dictionaries

Move ZSTD_DDict allocation, ownership, construction, and public ABI exports
into Rust. The C decoder keeps ZSTD_loadDEntropy until its table loader moves.

The C shim now exposes C-computed DCtx field offsets. This keeps dictionary
state correct across conditional C layouts, including fuzz fields and 32-bit
static-BMI2 builds, without duplicating decoder-context layout in Rust.

Test Plan:
- cargo fmt, cargo clippy, cargo clippy --benches, cargo clippy --tests
- cargo test --all-targets and cargo build --release
- cargo test/build --target i686-unknown-linux-gnu
- C fuzzer, zstreamtest, invalidDictionaries, and fuzzer32 smoke runs
- fuzz-enabled and i686 -mbmi2 C/Rust dictionary roundtrip harnesses

Refs: rust/README.md

This commit is contained in:

ddidderr

2026-07-10 21:20:50 +02:00

parent 65afd94867

commit ca70ca8061

4 changed files with 927 additions and 239 deletions

									
										rust/src/lib.rs
									
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				@@ -16,3 +16,4 @@ pub mod pool;

				pub mod threading;

				pub mod xxhash;

				pub mod zstd_common;

				pub mod zstd_ddict;