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Stefan Bodewig commented on COMPRESS-380: ----------------------------------------- I'm looking at the zlib infback9 files linked in the description of this issue. DEFLATE64 isn't documented officially by PKWARE, http://binaryessence.com/dct/imp/en000225.htm is useful to see the differences to DEFLATE. A DEFLATE64 decoder should be able to decode a DEFLATE stream that doesn't use the length code 285 (i.e. with no distance of exactly 258 bytes). > Support for ENHANCED_DEFLATED (Deflate64) in ZIP files > ------------------------------------------------------ > > Key: COMPRESS-380 > URL: https://issues.apache.org/jira/browse/COMPRESS-380 > Project: Commons Compress > Issue Type: New Feature > Reporter: Dawid Weiss > Fix For: 1.16 > > Attachments: archive-deflate.zip, archive-deflate64.zip, archive.zip, > archive64.zip, compress-380.diff, hello.world, input2 > > > Some of the (large) ZIP files we try to process currently will throw this: > {code} > UnsupportedZipFeatureException: unsupported feature method > 'ENHANCED_DEFLATED' > {code} > which is a bummer since JDK's implementation also doesn't support Deflate64. > This seems to be PKWare's extensions, although code to decrypt it exists in > zlib (and is appropriately licensed, I believe). > https://github.com/madler/zlib/tree/master/contrib/infback9 -- This message was sent by Atlassian JIRA (v6.4.14#64029)