Crate fdeflate

source ·
Expand description

A fast deflate implementation.

This crate contains an optimized implementation of the deflate algorithm tuned to compress PNG images. It is compatible with standard zlib, but make a bunch of simplifying assumptions that drastically improve encoding performance:

  • Exactly one block per deflate stream.
  • No distance codes except for run length encoding of zeros.
  • A single fixed huffman tree trained on a large corpus of PNG images.
  • All huffman codes are 12 bits or less.

It also contains a fast decompressor that supports arbitrary zlib streams but does especially well on streams that meet the above assumptions.

§Inspiration

The algorithms in this crate take inspiration from multiple sources:

Structs§

Enums§

Functions§