Complains about length of 0x5855 data field.

[madler]

Why is zipdetails happy with a length 12 0x5855 extensible data field in the local header:

000000025 Extra ID #0001        5855 'UX: Unix Extra type 1'
000000027   Length              000C
000000029   Access Time         62DF1FC7 'Mon Jul 25 15:57:11 2022'
00000002D   Mod Time            62DF0738 'Mon Jul 25 14:12:24 2022'
000000031   UID                 01F5
000000033   GID                 0014

but then complains about the exact same field in the central directory?

CC90F4A05 Extra ID #0001        5855 'UX: Unix Extra type 1'
CC90F4A07   Length              000C
# ERROR: Offset 0xCC90F4A07: 'Length' field in 'Extra ID' 0x5855 (Unix Extra type 1) invalid: expected 0x8, got 0xC

[pmqs]

The file extrafld.txt in the infozip sources says the local & central versions have different sizes. No idea of the history of that.

         -Info-ZIP Unix Extra Field (type 1):
          ==================================

          The following is the layout of the old Info-ZIP extra block for
          Unix.  It has been replaced by the extended-timestamp extra block
          (0x5455) and the Unix type 2 extra block (0x7855).
          (Last Revision 19970118)

          Local-header version:

          Value         Size        Description
          -----         ----        -----------
  (Unix1) 0x5855        Short       tag for this extra block type ("UX")
          TSize         Short       total data size for this block
          AcTime        Long        time of last access (UTC/GMT)
          ModTime       Long        time of last modification (UTC/GMT)
          UID           Short       Unix user ID (optional)
          GID           Short       Unix group ID (optional)

          Central-header version:

          Value         Size        Description
          -----         ----        -----------
  (Unix1) 0x5855        Short       tag for this extra block type ("UX")
          TSize         Short       total data size for this block
          AcTime        Long        time of last access (GMT/UTC)
          ModTime       Long        time of last modification (GMT/UTC)

...

          The local-header extra block may optionally contain UID and GID
          info for the file.  The local-header TSize value is the only
          indication of this.  Note that Unix UIDs and GIDs are usually
          specific to a particular machine, and they generally require root
          access to restore.

[madler]

Interesting. Ok.