Compressing "zip" utility would be useful (e.g. so that this archive could be opened on Windows without installing additional software) to have in addition to existing "unzip". For my usecase I rolled my own https://github.com/vadimkantorov/busyz (as busybox applet in https://github.com/busytex/busyide/blob/main/busyz.c) using https://github.com/richgel999/miniz
miniz.c is WAY too large. $ cc -Os -c miniz.c miniz.c:3079:9: note: ‘#pragma message: Using fopen, ftello, fseeko, stat() etc. path for file I/O - this path may not support large files.’ 3079 | #pragma message("Using fopen, ftello, fseeko, stat() etc. path for file I/O - this path may not support large files.") | ^~~~~~~ $ size miniz.o text data bss dec hex filename 57201 0 0 57201 df71 miniz.o For comparison, existing busybox code to handle zip file format: $ size unzip.o text data bss dec hex filename 3799 0 0 3799 ed7 unzip.o gzip decompressor per se: $ size libarchive/decompress_gunzip.o text data bss dec hex filename 4950 0 0 4950 1356 libarchive/decompress_gunzip.o and the gzip compression code: $ size gzip.o text data bss dec hex filename 5854 0 0 5854 16de gzip.o I would prefer something like 15kb or less of code to support .zip file creation. Not 57kb.