Amaury Forgeot d'Arc <amaur...@gmail.com> added the comment:
This header is optional. From
http://www.pkware.com/documents/casestudies/APPNOTE.TXT
Although not originally assigned a signature, the value
0x08074b50 has commonly been adopted as a signature value
for the data descriptor record. Implementers should be
aware that ZIP files may be encountered with or without this
signature marking data descriptors and should account for
either case when reading ZIP files to ensure compatibility.
When writing ZIP files, it is recommended to include the
signature value marking the data descriptor record. When
the signature is used, the fields currently defined for
the data descriptor record will immediately follow the
signature.
So this is Not A Bug (and "zip -T" correctly reports a Warning)
However, I suggest to follow the recommendation and add the signature,
for 2.7/3.1 only, and not to backport.
----------
nosy: +amaury.forgeotdarc
versions: +Python 2.7, Python 3.1 -Python 2.6, Python 3.0
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