libz-sys
A common library for linking libz to rust programs (also known as zlib).
This also serves as the source for the libz-ng-sys crate, which builds
zlib-ng natively (not in zlib-compat mode). See
README-zng.md for details.
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. flate2 also supports alternative
implementations, including slower but pure Rust implementations.
zlib-ng
This crate supports building either the high-performance zlib-ng (in zlib-compat mode), or the widely available stock zlib.
By default, libz-sys uses stock zlib, primarily because doing so allows the
use of a shared system zlib library if available.
Any application or library designed for zlib should work with zlib-ng in
zlib-compat mode, as long as it doesn't make assumptions about the exact size
or output of the deflated data (e.g. "compressing this data produces exactly
this many bytes"), and as long as you don't also dynamically pull in a copy of
stock zlib (which will produce conflicting symbols). Nonetheless, for maximum
compatibility, every library crate in a build must opt into allowing zlib-ng;
if any library crate in your dependency graph wants stock zlib, libz-sys will
use stock zlib.
Library crates depending on libz-sys should use:
libz-sys = { version = "1.1.0", default-features = false, features = ["libc"] }
(Omit the libc feature if you don't require the corresponding functions.)
This allows higher-level crates depending on your library to opt into zlib-ng if desired.
Building zlib-ng requires cmake.
License
This project is licensed under either of
- Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)
at your option.
Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in libz-sys by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.