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What would be nice is a library that you can load with LD_Preload and replaces zlib compression. That way I could easily use e.g. Optipng with this new algorithm.

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I don't think that would be of much use, since only it only deals with compression.

It only needs to overwrite the compression methods

Right, but compressors are easy to change, it's decompressors that are in hard-to-update software.

Also the compression for example in libpng

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