Restore compatibility with provided files

Certain documents are slightly invalid ZIP's: their entries have a data
descriptor, but their "flags" field say otherwise. Remain compatible
with our past

Restore compatibility with provided files

Certain documents are slightly invalid ZIP's: their entries have a data
descriptor, but their "flags" field say otherwise. Remain compatible
with our past bugs.

Thanks to Czesław Wolański for reporting, and Peter Kovacs for proposing
this fix!

(cherry picked from commit 57cd559d060c509755c8b0f6cac469b512911542)

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More checks

(cherry picked from commit 66ab9c1188ef75c84225c856a87bc93d575247ca)

Fix check for enough bytes remaining

Issue found by Damjan Jovanovic. Thank you!

(cherry picked from commit e8b69c8c40ed70ab02f2db79c62a8803ffec612a)

Fix the serious regression from commit 1972b29432a5b05e40ec16d939ddb345b981e240,
where HSQLDB database documents were getting corrupted and OpenOffice was even
crashing.

The ZipEntry.nFileDataOffset

Fix the serious regression from commit 1972b29432a5b05e40ec16d939ddb345b981e240,
where HSQLDB database documents were getting corrupted and OpenOffice was even
crashing.

The ZipEntry.nFileDataOffset field needed to be set to -1 like before,
not to the nFileHeaderOffset.

Patch by: me

(cherry picked from commit 7f52a288cb10ed2497d68d96ab2828ed813f91a6)

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Fix a bug with ZIP extra fields.

Valid ZIP file entries with more than 1 extra field were considered invalid.

(cherry picked from commit d6c7ae7720ddc812112d7577125e4a874e26ad2c)

Correct possible issues with ZIP files

(cherry picked and adapted from commit 1972b29432a5b05e40ec16d939ddb345b981e240)