1 files changed, 57 insertions, 0 deletions
diff --git a/vendor/libz-sys/README-zng.md b/vendor/libz-sys/README-zng.md
new file mode 100644
index 0000000..4ac40e0
--- /dev/null
+++ b/vendor/libz-sys/README-zng.md
@@ -0,0 +1,57 @@
+# libz-ng-sys
+
+A library for linking zlib-ng (`libz-ng`) to Rust programs natively, rather
+than in zlib-compat mode.
+
+zlib-ng is a high-performance implementation of zlib. zlib-ng supports building
+in two modes: zlib-compat mode, in whih it provides the same API as zlib and
+generally works as a drop-in replacement, and native mode, in which it provides
+its own API. The native API is almost identical to the zlib-compat API, except
+that some types use more correct sizes (rather than the sizes required for zlib
+compatibility), and the functions all have a `zng_` prefix. The latter allows
+zlib and zlib-ng to coexist in the same program.
+
+This crate provides bindings to the native zlib-ng API. However, for simplicity
+of porting, this crate exports the same API as libz-sys (without the `zng_`
+prefixes), making it easier to write Rust software compatible with both
+libz-sys and libz-ng-sys.
+
+# High-level API
+
+This crate provides bindings to the raw low-level C API. For a higher-level
+safe API to work with DEFLATE, zlib, or gzip streams, see
+[`flate2`](https://docs.rs/flate2). `flate2` supports many different
+implementations.
+
+# Development
+
+This crate is built from [the same sources as
+`libz-sys`](https://github.com/rust-lang/libz-sys). From within those sources,
+`Cargo.toml` is the manifest for `libz-sys`, and `Cargo-zng.toml` is the
+manifest for `libz-ng-sys`. The script `./cargo-zng` invokes Cargo on a
+temporary copy of the sources with `Cargo-zng.toml` replacing `Cargo.toml`; for
+instance, use `./cargo-zng publish` to publish `libz-ng-sys`.
+
+# Minimum Supported Rust Version (MSRV) Policy
+
+This crate uses the same MSRV policy as the
+[`flate2`](https://crates.io/crates/flate2) crate: This crate supports the
+current and previous stable versions of Rust. Older versions of Rust may work,
+but we don't guarantee these will continue to work.
+
+# License
+
+This project is licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+   http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+   http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
+be dual licensed as above, without any additional terms or conditions.