Crate zopfli

A reimplementation of the Zopfli compression library in Rust.

Zopfli is a state of the art DEFLATE compressor that heavily prioritizes compression over speed. It usually compresses much better than other DEFLATE compressors, generating standard DEFLATE streams that can be decompressed with any DEFLATE decompressor, at the cost of being significantly slower.

Features

This crate exposes the following features. You can enable or disable them in your Cargo.toml as needed.

• gzip (enabled by default): enables support for compression in the gzip format.
• zlib (enabled by default): enables support for compression in the Zlib format.
• std (enabled by default): enables linking against the Rust standard library. When not enabled, the crate is built with the #![no_std] attribute and can be used in any environment where alloc (i.e., a memory allocator) is available. In addition, the crate exposes minimalist versions of the std I/O traits it needs to function, allowing users to implement them. Disabling std requires enabling nightly due to dependencies on unstable language features.
• nightly: enables performance optimizations that are specific to the nightly Rust toolchain. Currently, this feature improves rustdoc generation and enables the namesake feature on crc32fast, but this may change in the future. This feature also used to enable simd-adler32’s namesake feature, but it no longer does as the latest simd-adler32 release does not build with the latest nightlies (as of 2024-05-18) when that feature is enabled.

Structs

DeflateEncoder

A DEFLATE encoder powered by the Zopfli algorithm that compresses data written to it to the specified sink. Most users will find using compress easier and more performant.

ErrorNon-std

The error type for I/O operations of the Write trait.

GzipEncodergzip

A Gzip encoder powered by the Zopfli algorithm, that compresses data using a DeflateEncoder. Most users will find using compress easier and more performant.

Options

Options for the Zopfli compression algorithm.

ZlibEncoderzlib

A Zlib encoder powered by the Zopfli algorithm, that compresses data using a DeflateEncoder. Most users will find using compress easier and more performant.

Enums

BlockType

The type of data blocks to generate for a DEFLATE stream.

ErrorKindNon-std

A list specifying general categories of I/O error.

Formatstd

The output file format to use to store data compressed with Zopfli.

Traits

WriteNon-std

A trait for objects which are byte-oriented sinks, modeled after its std::io::Write counterpart.

Functions

compressstd

Compresses data from a source with the Zopfli algorithm, using the specified options, and writes the result to a sink in the defined output format.

prewarm_object_poolsstd

Populates object pools for expensive objects that Zopfli uses. Call this on a background thread when you know ahead of time that compression will be needed.