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authorValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
committerValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
commita990de90fe41456a23e58bd087d2f107d321f3a1 (patch)
tree15afc392522a9e85dc3332235e311b7d39352ea9 /vendor/weezl/src/lib.rs
parent3d48cd3f81164bbfc1a755dc1d4a9a02f98c8ddd (diff)
downloadfparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.tar.xz
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-//! # LZW decoder and encoder
-//!
-//! This crates provides an `Encoder` and a `Decoder` in their respective modules. The code words
-//! are written from and to bit byte slices (or streams) where it is possible to write either the
-//! most or least significant bits first. The maximum possible code size is 12 bits, the smallest
-//! available code size is 2 bits.
-//!
-//! ## Example
-//!
-//! These two code blocks show the compression and corresponding decompression. Note that you must
-//! use the same arguments to `Encoder` and `Decoder`, otherwise the decoding might fail or produce
-//! bad results.
-//!
-#![cfg_attr(feature = "std", doc = "```")]
-#![cfg_attr(not(feature = "std"), doc = "```ignore")]
-//! use weezl::{BitOrder, encode::Encoder};
-//!
-//! let data = b"Hello, world";
-//! let compressed = Encoder::new(BitOrder::Msb, 9)
-//! .encode(data)
-//! .unwrap();
-//! ```
-//!
-#![cfg_attr(feature = "std", doc = "```")]
-#![cfg_attr(not(feature = "std"), doc = "```ignore")]
-//! use weezl::{BitOrder, decode::Decoder};
-//! # let compressed = b"\x80\x04\x81\x94l\x1b\x06\xf0\xb0 \x1d\xc6\xf1\xc8l\x19 \x10".to_vec();
-//! # let data = b"Hello, world";
-//!
-//! let decompressed = Decoder::new(BitOrder::Msb, 9)
-//! .decode(&compressed)
-//! .unwrap();
-//! assert_eq!(decompressed, data);
-//! ```
-//!
-//! ## LZW Details
-//!
-//! The de- and encoder expect the LZW stream to start with a clear code and end with an
-//! end code which are defined as follows:
-//!
-//! * `CLEAR_CODE == 1 << min_code_size`
-//! * `END_CODE == CLEAR_CODE + 1`
-//!
-//! For optimal performance, all buffers and input and output slices should be as large as possible
-//! and at least 2048 bytes long. This extends to input streams which should have similarly sized
-//! buffers. This library uses Rust's standard allocation interfaces (`Box` and `Vec` to be
-//! precise). Since there are no ways to handle allocation errors it is not recommended to operate
-//! it on 16-bit targets.
-//!
-//! ## Allocations and standard library
-//!
-//! The main algorithm can be used in `no_std` as well, although it requires an allocator. This
-//! restriction might be lifted at a later stage. For this you should deactivate the `std` feature.
-//! The main interfaces stay intact but the `into_stream` combinator is no available.
-#![cfg_attr(not(feature = "std"), no_std)]
-#![forbid(unsafe_code)]
-#![forbid(missing_docs)]
-
-#[cfg(all(feature = "alloc", not(feature = "std")))]
-extern crate alloc;
-#[cfg(all(feature = "alloc", feature = "std"))]
-use std as alloc;
-
-pub(crate) const MAX_CODESIZE: u8 = 12;
-pub(crate) const MAX_ENTRIES: usize = 1 << MAX_CODESIZE as usize;
-
-/// Alias for a LZW code point
-pub(crate) type Code = u16;
-
-/// A default buffer size for encoding/decoding buffer.
-///
-/// Note that this is larger than the default size for buffers (usually 4K) since each code word
-/// can expand to multiple bytes. Expanding one buffer would yield multiple and require a costly
-/// break in the decoding loop. Note that the decoded size can be up to quadratic in code block.
-pub(crate) const STREAM_BUF_SIZE: usize = 1 << 24;
-
-/// The order of bits in bytes.
-#[derive(Clone, Copy, Debug)]
-pub enum BitOrder {
- /// The most significant bit is processed first.
- Msb,
- /// The least significant bit is processed first.
- Lsb,
-}
-
-/// An owned or borrowed buffer for stream operations.
-#[cfg(feature = "alloc")]
-pub(crate) enum StreamBuf<'d> {
- Borrowed(&'d mut [u8]),
- Owned(crate::alloc::vec::Vec<u8>),
-}
-
-#[cold]
-fn assert_decode_size(size: u8) {
- assert!(
- size <= MAX_CODESIZE,
- "Maximum code size 12 required, got {}",
- size
- );
-}
-
-#[cold]
-fn assert_encode_size(size: u8) {
- assert!(size >= 2, "Minimum code size 2 required, got {}", size);
- assert!(
- size <= MAX_CODESIZE,
- "Maximum code size 12 required, got {}",
- size
- );
-}
-
-#[cfg(feature = "alloc")]
-pub mod decode;
-#[cfg(feature = "alloc")]
-pub mod encode;
-mod error;
-
-#[cfg(feature = "std")]
-pub use self::error::StreamResult;
-pub use self::error::{BufferResult, LzwError, LzwStatus};
-
-#[cfg(all(test, feature = "alloc"))]
-mod tests {
- use crate::decode::Decoder;
- use crate::encode::Encoder;
-
- #[cfg(feature = "std")]
- use crate::{decode, encode};
-
- #[test]
- fn stable_send() {
- fn must_be_send<T: Send + 'static>() {}
- must_be_send::<Decoder>();
- must_be_send::<Encoder>();
-
- #[cfg(feature = "std")]
- fn _send_and_lt<'lt, T: Send + 'lt>() {}
-
- // Check that the inference `W: Send + 'd` => `IntoStream: Send + 'd` works.
- #[cfg(feature = "std")]
- fn _all_send_writer<'d, W: std::io::Write + Send + 'd>() {
- _send_and_lt::<'d, decode::IntoStream<'d, W>>();
- _send_and_lt::<'d, encode::IntoStream<'d, W>>();
- }
- }
-}