Zpng VS ZLib

> You'd probably get even better results by using PNG's filters instead of QOI

Did anybody ever try this? It would be quite interesting and does not seem too difficult.

The only thing I could find is https://github.com/catid/Zpng which does not use the normal PNG filtering.

Also, Chris Taylor published an experimental PNG library with Zstd hardwired in.

- I feel like the benchmark suite is lacking. For better overview you probably should include libpng results with max compression level and lowest compression level. Lossless modes of AVIF and WEBP would be nice. (also could throw similar project to yours like https://github.com/catid/Zpng) Not saying the benchmark is bad, but IMHO doesn't paint the full picture. From quick test I got significantly better compression on libpng, ofc in expense of time, but you didn't optimize it for speed either. So we have some results, but they are not really representative imho.

A fix has been checked into the upstream git repo: https://github.com/madler/zlib/pull/843 but a release has not yet been made including it.

So the real issue here is that the lack of tree validation before the tree construction, I believe. I'm surprised that this check was not yet implemented (I actually checked libwebp to make sure that I was missing one). Given this blind spot, an automated test based on the domain knowledge is likely useless to catch this bug.

[1] https://github.com/madler/zlib/blob/master/examples/enough.c

In the source code of the Node.js opensource project, lib folder contains JavaScript code, mostly wrappers over C++ and function definitions. On the contrary, src folder contains C++ implementations of the functions, which pulls dependencies from the V8 project, the libuv project, the zlib project, the llhttp project, and many more - which are all placed at the deps folder.

Seeing the text in red got me thinking for a moment, "wow, didn't realize pirates had such love for an open-source compression library"

cd "${srcdir}/zlib-$pkgver/contrib/minizip" make install DESTDIR="${pkgdir}" install -D -m644 "${srcdir}/zlib-$pkgver/LICENSE" "${pkgdir}/usr/share/licenses/minizip/LICENSE" # https://github.com/madler/zlib/pull/229 rm "${pkgdir}/usr/include/minizip/crypt.h"