Adding upstream version 0.70.1+ds1.upstream/0.70.1+ds1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 234 insertions, 0 deletions

diff --git a/vendor/flate2/src/lib.rs b/vendor/flate2/src/lib.rs
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+//! 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.
+//!
+//! # About multi-member Gzip files
+//!
+//! While most `gzip` files one encounters will have a single *member* that can be read
+//! with the [`GzDecoder`], there may be some files which have multiple members.
+//!
+//! A [`GzDecoder`] will only read the first member of gzip data, which may unexpectedly
+//! provide partial results when a multi-member gzip file is encountered. `GzDecoder` is appropriate
+//! for data that is designed to be read as single members from a multi-member file. `bufread::GzDecoder`
+//! and `write::GzDecoder` also allow non-gzip data following gzip data to be handled.
+//!
+//! The [`MultiGzDecoder`] on the other hand will decode all members of a `gzip` file
+//! into one consecutive stream of bytes, which hides the underlying *members* entirely.
+//! If a file contains contains non-gzip data after the gzip data, MultiGzDecoder will
+//! emit an error after decoding the gzip data. This behavior matches the `gzip`,
+//! `gunzip`, and `zcat` command line tools.
+//!
+//! [`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
+//! [`GzDecoder`]: read/struct.GzDecoder.html
+//! [`MultiGzDecoder`]: read/struct.MultiGzDecoder.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))]
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+
+#[cfg(not(feature = "any_impl",))]
+compile_error!("You need to choose a zlib backend");
+
+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.
+///
+/// Note that the `read` decoder types may read past the end of the compressed
+/// data while decoding. If the caller requires subsequent reads to start
+/// immediately following the compressed data  wrap the `Read` type in a
+/// [`BufReader`] and use the `BufReader` with the equivalent decoder from the
+/// `bufread` module and also for the subsequent reads.
+///
+/// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html
+/// [`BufReader`]: https://doc.rust-lang.org/std/io/struct.BufReader.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::gz::write::MultiGzDecoder;
+    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 struct.
+#[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())
+}