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https://issues.apache.org/jira/browse/COMPRESS-380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16305302#comment-16305302
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Dawid Weiss edited comment on COMPRESS-380 at 12/28/17 10:25 AM:
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These (archive.zip, archive64.zip, input2) attached streams aren't
binary-identical, perhaps it'll be of greater help. I generated a random
sequence and folded it around other random sequence. The input is also attached
for reference.
{code}
rm -f archive*.zip
dd if=/dev/urandom bs=1024 count=1 2>/dev/null > input1
cat input1 > input2
dd if=/dev/urandom bs=1024 count=1 2>/dev/null >> input2
cat input1 >> input2
rm input1
7za a -mm=deflate64 archive64.zip input2
7za a -mm=deflate archive.zip input2
ls -l archive*.zip
{code}
was (Author: dweiss):
These streams aren't binary-identical. I generated a random sequence and folded
it around other random sequence. The input is also attached for reference.
{code}
rm -f archive*.zip
dd if=/dev/urandom bs=1024 count=1 2>/dev/null > input1
cat input1 > input2
dd if=/dev/urandom bs=1024 count=1 2>/dev/null >> input2
cat input1 >> input2
rm input1
7za a -mm=deflate64 archive64.zip input2
7za a -mm=deflate archive.zip input2
ls -l archive*.zip
{code}
> 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
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