115 lines
3.4 KiB
Markdown
115 lines
3.4 KiB
Markdown
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# flate2
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[](https://crates.io/crates/flate2)
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[](https://docs.rs/flate2)
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A streaming compression/decompression library DEFLATE-based streams in Rust.
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This crate by default uses the `miniz_oxide` crate, a port of `miniz.c` to pure
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Rust. This crate also supports other [backends](#Backends), such as the widely
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available zlib library or the high-performance zlib-ng library.
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Supported formats:
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* deflate
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* zlib
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* gzip
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```toml
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# Cargo.toml
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[dependencies]
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flate2 = "1.0"
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```
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## Compression
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```rust
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use std::io::prelude::*;
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use flate2::Compression;
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use flate2::write::ZlibEncoder;
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fn main() {
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let mut e = ZlibEncoder::new(Vec::new(), Compression::default());
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e.write_all(b"foo");
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e.write_all(b"bar");
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let compressed_bytes = e.finish();
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}
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```
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## Decompression
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```rust,no_run
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use std::io::prelude::*;
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use flate2::read::GzDecoder;
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fn main() {
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let mut d = GzDecoder::new("...".as_bytes());
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let mut s = String::new();
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d.read_to_string(&mut s).unwrap();
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println!("{}", s);
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}
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```
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## Backends
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The default `miniz_oxide` backend has the advantage of being pure Rust. If you
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want maximum performance, you can use the zlib-ng C library:
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```toml
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[dependencies]
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flate2 = { version = "1.0.17", features = ["zlib-ng"], default-features = false }
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```
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Note that the `"zlib-ng"` feature works even if some other part of your crate
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graph depends on zlib.
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However, if you're already using another C or Rust library that depends on
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zlib, and you want to avoid including both zlib and zlib-ng, you can use that
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for Rust code as well:
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```toml
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[dependencies]
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flate2 = { version = "1.0.17", features = ["zlib"], default-features = false }
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```
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Or, if you have C or Rust code that depends on zlib and you want to use zlib-ng
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via libz-sys in zlib-compat mode, use:
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```toml
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[dependencies]
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flate2 = { version = "1.0.17", features = ["zlib-ng-compat"], default-features = false }
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```
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Note that when using the `"zlib-ng-compat"` feature, if any crate in your
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dependency graph explicitly requests stock zlib, or uses libz-sys directly
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without `default-features = false`, you'll get stock zlib rather than zlib-ng.
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See [the libz-sys
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README](https://github.com/rust-lang/libz-sys/blob/main/README.md) for details.
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To avoid that, use the `"zlib-ng"` feature instead.
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For compatibility with previous versions of `flate2`, the Cloudflare optimized
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version of zlib is available, via the `cloudflare_zlib` feature. It's not as
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fast as zlib-ng, but it's faster than stock zlib. It requires an x86-64 CPU with
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SSE 4.2 or ARM64 with NEON & CRC. It does not support 32-bit CPUs at all and is
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incompatible with mingw. For more information check the [crate
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documentation](https://crates.io/crates/cloudflare-zlib-sys). Note that
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`cloudflare_zlib` will cause breakage if any other crate in your crate graph
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uses another version of zlib/libz.
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# License
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This project is licensed under either of
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* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
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https://www.apache.org/licenses/LICENSE-2.0)
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* MIT license ([LICENSE-MIT](LICENSE-MIT) or
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https://opensource.org/licenses/MIT)
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at your option.
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### Contribution
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Unless you explicitly state otherwise, any contribution intentionally submitted
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for inclusion in this project by you, as defined in the Apache-2.0 license,
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shall be dual licensed as above, without any additional terms or conditions.
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