Release Date: 2018-08-12

Level Code Display Definition
1 BZ bzip bzip-2 compression format. See [http://www.bzip.org/] for more information.
1 DF deflate The deflate compressed data format as specified in RFC 1951 [http://www.ietf.org/rfc/rfc1951.txt].
1 GZ gzip A compressed data format that is compatible with the widely used GZIP utility as specified in RFC 1952 [http://www.ietf.org/rfc/rfc1952.txt] (uses the deflate algorithm).
1 Z compress Original UNIX compress algorithm and file format using the LZC algorithm (a variant of LZW). Patent encumbered and less efficient than deflate.
1 Z7 Z7 7z compression file format. See [http://www.7-zip.org/7z.html] for more information.
1 ZL zlib A compressed data format that also uses the deflate algorithm. Specified as RFC 1950 [http://www.ietf.org/rfc/rfc1952.txt]
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