此crate是zlib-rs的C API。API广泛等同于zlib-sys和zlib-ng-sys，但当前不提供gz*系列函数。

从Rust的角度来看，此API不太方便。请使用flate2 crate以获得更方便的zlib Rust接口。

示例

此示例压缩（“解压缩”）字符串"Hello, World!"然后再次解压缩（“膨胀”）。

let mut strm = libz_rs_sys::z_stream::default();

let version = libz_rs_sys::zlibVersion();
let stream_size = core::mem::size_of_val(&strm) as i32;

let level = 6; // the default compression level
let err = unsafe { libz_rs_sys::deflateInit_(&mut strm, level, version, stream_size) };
assert_eq!(err, libz_rs_sys::Z_OK);

let input = "Hello, World!";
strm.avail_in = input.len() as _;
strm.next_in = input.as_ptr();

let mut output = [0u8; 32];
strm.avail_out = output.len() as _;
strm.next_out = output.as_mut_ptr();

let err = unsafe { libz_rs_sys::deflate(&mut strm, libz_rs_sys::Z_FINISH) };
assert_eq!(err, libz_rs_sys::Z_STREAM_END);

let err = unsafe { libz_rs_sys::deflateEnd(&mut strm) };
assert_eq!(err, libz_rs_sys::Z_OK);

let deflated = &mut output[..strm.total_out as usize];

let mut strm = libz_rs_sys::z_stream::default();
let err = unsafe { libz_rs_sys::inflateInit_(&mut strm, version, stream_size) };
assert_eq!(err, libz_rs_sys::Z_OK);

strm.avail_in = deflated.len() as _;
strm.next_in = deflated.as_ptr();

let mut output = [0u8; 32];
strm.avail_out = output.len() as _;
strm.next_out = output.as_mut_ptr();

let err = unsafe { libz_rs_sys::inflate(&mut strm, libz_rs_sys::Z_FINISH) };
assert_eq!(err, libz_rs_sys::Z_STREAM_END);

let err = unsafe { libz_rs_sys::inflateEnd(&mut strm) };
assert_eq!(err, libz_rs_sys::Z_OK);

let inflated = &output[..strm.total_out as usize];

assert_eq!(inflated, input.as_bytes())