I wrote a standalone gzip decompressor in about 500 lines of code (including comments, with braces on the next line), with no dependencies at all: https://commandlinefanatic.com/cgi-bin/showarticle.cgi?artic...

Interesting, the decompressor in Jdeflate is around 4k LoC. https://github.com/Jpn666/jdeflate