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Dawid Weiss commented on COMPRESS-380: -------------------------------------- bq. A pure Java DEFLATE64 will certainly be slower than the JNI based DEFLATE built into the JDK (which we re-use as well). I don't think Java supports DEFLATE64 -- tried Java8 and Java9 and they don't (Oracle and IBM). This tool does, supposedly (and is Apache licensed): http://www.lingala.net/zip4j/ But I haven't tried it. > 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 > > 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 (v6.3.4#6332)