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| -rw-r--r-- | third_party/rust/flate2/src/lib.rs | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/third_party/rust/flate2/src/lib.rs b/third_party/rust/flate2/src/lib.rs new file mode 100644 index 0000000000..23a783e559 --- /dev/null +++ b/third_party/rust/flate2/src/lib.rs @@ -0,0 +1,204 @@ +//! A DEFLATE-based stream compression/decompression library +//! +//! This library provides support for compression and decompression of +//! DEFLATE-based streams: +//! +//! * the DEFLATE format itself +//! * the zlib format +//! * gzip +//! +//! These three formats are all closely related and largely only differ in their +//! headers/footers. This crate has three types in each submodule for dealing +//! with these three formats. +//! +//! # Implementation +//! +//! In addition to supporting three formats, this crate supports several different +//! backends, controlled through this crate's features: +//! +//! * `default`, or `rust_backend` - this implementation uses the `miniz_oxide` +//! crate which is a port of `miniz.c` (below) to Rust. This feature does not +//! require a C compiler and only requires Rust code. +//! +//! * `zlib` - this feature will enable linking against the `libz` library, typically found on most +//! Linux systems by default. If the library isn't found to already be on the system it will be +//! compiled from source (this is a C library). +//! +//! There's various tradeoffs associated with each implementation, but in general you probably +//! won't have to tweak the defaults. The default choice is selected to avoid the need for a C +//! compiler at build time. `zlib-ng-compat` is useful if you're using zlib for compatibility but +//! want performance via zlib-ng's zlib-compat mode. `zlib` is useful if something else in your +//! dependencies links the original zlib so you cannot use zlib-ng-compat. The compression ratios +//! and performance of each of these feature should be roughly comparable, but you'll likely want +//! to run your own tests if you're curious about the performance. +//! +//! # Organization +//! +//! This crate consists mainly of three modules, [`read`], [`write`], and +//! [`bufread`]. Each module contains a number of types used to encode and +//! decode various streams of data. +//! +//! All types in the [`write`] module work on instances of [`Write`][write], +//! whereas all types in the [`read`] module work on instances of +//! [`Read`][read] and [`bufread`] works with [`BufRead`][bufread]. If you +//! are decoding directly from a `&[u8]`, use the [`bufread`] types. +//! +//! ``` +//! use flate2::write::GzEncoder; +//! use flate2::Compression; +//! use std::io; +//! use std::io::prelude::*; +//! +//! # fn main() { let _ = run(); } +//! # fn run() -> io::Result<()> { +//! let mut encoder = GzEncoder::new(Vec::new(), Compression::default()); +//! encoder.write_all(b"Example")?; +//! # Ok(()) +//! # } +//! ``` +//! +//! +//! Other various types are provided at the top-level of the crate for +//! management and dealing with encoders/decoders. Also note that types which +//! operate over a specific trait often implement the mirroring trait as well. +//! For example a `flate2::read::DeflateDecoder<T>` *also* implements the +//! `Write` trait if `T: Write`. That is, the "dual trait" is forwarded directly +//! to the underlying object if available. +//! +//! [`read`]: read/index.html +//! [`bufread`]: bufread/index.html +//! [`write`]: write/index.html +//! [read]: https://doc.rust-lang.org/std/io/trait.Read.html +//! [write]: https://doc.rust-lang.org/std/io/trait.Write.html +//! [bufread]: https://doc.rust-lang.org/std/io/trait.BufRead.html +#![doc(html_root_url = "https://docs.rs/flate2/0.2")] +#![deny(missing_docs)] +#![deny(missing_debug_implementations)] +#![allow(trivial_numeric_casts)] +#![cfg_attr(test, deny(warnings))] + +pub use crate::crc::{Crc, CrcReader, CrcWriter}; +pub use crate::gz::GzBuilder; +pub use crate::gz::GzHeader; +pub use crate::mem::{Compress, CompressError, Decompress, DecompressError, Status}; +pub use crate::mem::{FlushCompress, FlushDecompress}; + +mod bufreader; +mod crc; +mod deflate; +mod ffi; +mod gz; +mod mem; +mod zio; +mod zlib; + +/// Types which operate over [`Read`] streams, both encoders and decoders for +/// various formats. +/// +/// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html +pub mod read { + pub use crate::deflate::read::DeflateDecoder; + pub use crate::deflate::read::DeflateEncoder; + pub use crate::gz::read::GzDecoder; + pub use crate::gz::read::GzEncoder; + pub use crate::gz::read::MultiGzDecoder; + pub use crate::zlib::read::ZlibDecoder; + pub use crate::zlib::read::ZlibEncoder; +} + +/// Types which operate over [`Write`] streams, both encoders and decoders for +/// various formats. +/// +/// [`Write`]: https://doc.rust-lang.org/std/io/trait.Write.html +pub mod write { + pub use crate::deflate::write::DeflateDecoder; + pub use crate::deflate::write::DeflateEncoder; + pub use crate::gz::write::GzDecoder; + pub use crate::gz::write::GzEncoder; + pub use crate::zlib::write::ZlibDecoder; + pub use crate::zlib::write::ZlibEncoder; +} + +/// Types which operate over [`BufRead`] streams, both encoders and decoders for +/// various formats. +/// +/// [`BufRead`]: https://doc.rust-lang.org/std/io/trait.BufRead.html +pub mod bufread { + pub use crate::deflate::bufread::DeflateDecoder; + pub use crate::deflate::bufread::DeflateEncoder; + pub use crate::gz::bufread::GzDecoder; + pub use crate::gz::bufread::GzEncoder; + pub use crate::gz::bufread::MultiGzDecoder; + pub use crate::zlib::bufread::ZlibDecoder; + pub use crate::zlib::bufread::ZlibEncoder; +} + +fn _assert_send_sync() { + fn _assert_send_sync<T: Send + Sync>() {} + + _assert_send_sync::<read::DeflateEncoder<&[u8]>>(); + _assert_send_sync::<read::DeflateDecoder<&[u8]>>(); + _assert_send_sync::<read::ZlibEncoder<&[u8]>>(); + _assert_send_sync::<read::ZlibDecoder<&[u8]>>(); + _assert_send_sync::<read::GzEncoder<&[u8]>>(); + _assert_send_sync::<read::GzDecoder<&[u8]>>(); + _assert_send_sync::<read::MultiGzDecoder<&[u8]>>(); + _assert_send_sync::<write::DeflateEncoder<Vec<u8>>>(); + _assert_send_sync::<write::DeflateDecoder<Vec<u8>>>(); + _assert_send_sync::<write::ZlibEncoder<Vec<u8>>>(); + _assert_send_sync::<write::ZlibDecoder<Vec<u8>>>(); + _assert_send_sync::<write::GzEncoder<Vec<u8>>>(); + _assert_send_sync::<write::GzDecoder<Vec<u8>>>(); +} + +/// When compressing data, the compression level can be specified by a value in +/// this enum. +#[derive(Copy, Clone, PartialEq, Eq, Debug)] +pub struct Compression(u32); + +impl Compression { + /// Creates a new description of the compression level with an explicitly + /// specified integer. + /// + /// The integer here is typically on a scale of 0-9 where 0 means "no + /// compression" and 9 means "take as long as you'd like". + pub const fn new(level: u32) -> Compression { + Compression(level) + } + + /// No compression is to be performed, this may actually inflate data + /// slightly when encoding. + pub const fn none() -> Compression { + Compression(0) + } + + /// Optimize for the best speed of encoding. + pub const fn fast() -> Compression { + Compression(1) + } + + /// Optimize for the size of data being encoded. + pub const fn best() -> Compression { + Compression(9) + } + + /// Returns an integer representing the compression level, typically on a + /// scale of 0-9 + pub fn level(&self) -> u32 { + self.0 + } +} + +impl Default for Compression { + fn default() -> Compression { + Compression(6) + } +} + +#[cfg(test)] +fn random_bytes() -> impl Iterator<Item = u8> { + use rand::Rng; + use std::iter; + + iter::repeat(()).map(|_| rand::thread_rng().gen()) +} |