Krzysztof Rzymkowski created COMPRESS-474:
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Summary: xlsx zip64 compatibility
Key: COMPRESS-474
URL: https://issues.apache.org/jira/browse/COMPRESS-474
Project: Commons Compress
Issue Type: Bug
Components: Archivers
Affects Versions: 1.19
Reporter: Krzysztof Rzymkowski
Excel's xlsx files are generally zip archives. But Excel has a very specific
and strict ZIP64 implementation.
Connected Apache POI issue:
[https://bz.apache.org/bugzilla/show_bug.cgi?id=57342
]My blog post with all the details: [https://rzymek.github.io/post/excel-zip64/]
My observations on Excel requirements:
# If file size is > 4gb, then zip spec version 4.5 must be set in Local Header
File
# In streaming creation the zero file sizes must be in 32 field, not in LHF's
ZIP64 extra field data.
# ZIP64 extra field in Central Directory must not include
relativeHeaderOffset. Only size or size and compressed size
# ZIP64 Central Directory is not supported
I did verify these in a +prototype+ repository at
[https://github.com/rzymek/commons-compress/pull/1/files]. This is just a
playground where I've tested the changes to verify that Excel opens the
generated file.
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