Daniel Hillier <daniel.hill...@gmail.com> added the comment:
Could something similar be achieved by looking for the earliest file header
offset?
def find_earliest_header_offset(zf):
earliest_offset = None
for zinfo in zf.infolist():
if earliest_offset is None:
earliest_offset = zinfo.header_offset
else:
earliest_offset = min(zinfo.header_offset, earliest_offset)
return earliest_offset
You could also adapt this using
zinfo.compress_size + len(zinfo.FileHeader())
to see if there were any sections inside the archive which were not referenced
from the central directory. Not sure if zip files with arbitrary bytes inside
the archive would be valid everywhere, but I think they are using zipfile.
You can also have zipped content inside an archive which has a valid fileheader
but no reference from the central directory. Those entries are discoverable by
implementations which process content serially from the start of the file but
not implementations which rely on the central directory.
----------
nosy: +dhillier
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<https://bugs.python.org/issue40301>
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