Losslessly (without rewriting Deflate compression stream) convert your ZIP to GZ file. You can pick to write filename string of packed file into GZ file incase someone changes archive name or just or leave it off saving length of archived filename+1 bytes.
There is one condition you must meet! The ZIP filename before .zip must be the same as archived filename, for example, if archived filename is mymommusic.tar then zip file must be name mymommusic.tar.zip! NO EXCEPTIONS! Not doing this may result in GZ being corrupted!!! (maybe I will work it out someday to autodetect filename in zip file)
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