The C command-line parser accepts short-form levels through an unsigned
32-bit conversion before storing them in the signed compression-level field.
The Rust parser used signed parsing for both ordinary levels and --fast,
rejecting 4294967295 even though it represents the valid fast level -1.
Mirror the conversion and retain the fast-level clamp for the attached form.
Test Plan:
- cargo test --manifest-path rust/cli/Cargo.toml --all-features
- cargo clippy --manifest-path rust/cli/Cargo.toml --all-targets -- -D warnings
- make -C programs zstd
- ./programs/zstd --fast -4294967295 tests/playTests.sh -o /tmp/zstd-fast-test
- ./programs/zstd --fast=4294967295 tests/playTests.sh -o /tmp/zstd-fast-test
Refs: tests/playTests.sh maximum fast-level cases
ddidderr
48206ed6c0