Vendor things

third-party/vendor/fdeflate/README.md

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+# fdeflate
+
+[![crates.io](https://img.shields.io/crates/v/fdeflate.svg)](https://crates.io/crates/fdeflate)
+[![Documentation](https://docs.rs/fdeflate/badge.svg)](https://docs.rs/fdeflate)
+[![Build Status](https://img.shields.io/github/actions/workflow/status/image-rs/fdeflate/rust.yml?label=Rust%20CI)](https://github.com/image-rs/fdeflate/actions)
+
+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.
+
+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:
+* [fpnge](https://github.com/veluca93/fpnge)
+* [zune-inflate](https://github.com/etemesi254/zune-image/tree/main/zune-inflate)
+* [RealTime Data Compression blog](https://fastcompression.blogspot.com/2015/10/huffman-revisited-part-4-multi-bytes.html)