[COMPRESS-210] handle zip extra field 0x5455 - Extended Timestamp

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.5
• Component/s: Archivers
• Assignee: Julius Davies
• Reporter: Julius Davies
• Created: 06/Dec/12 02:46
• Updated: 03/Jul/17 19:07
• Resolved: 14/Jan/13 23:27

Description

From Info Zip's "zip-3.0" source archive (proginfo/extrafld.txt):

-Extended Timestamp Extra Field:
==============================

The following is the layout of the extended-timestamp extra block.
(Last Revision 19970118)

          Local-header version:

          Value         Size        Description
          -----         ----        -----------
  (time)  0x5455        Short       tag for this extra block type ("UT")
          TSize         Short       total data size for this block
          Flags         Byte        info bits
          (ModTime)     Long        time of last modification (UTC/GMT)
          (AcTime)      Long        time of last access (UTC/GMT)
          (CrTime)      Long        time of original creation (UTC/GMT)

          Central-header version:

          Value         Size        Description
          -----         ----        -----------
  (time)  0x5455        Short       tag for this extra block type ("UT")
          TSize         Short       total data size for this block
          Flags         Byte        info bits (refers to local header!)
          (ModTime)     Long        time of last modification (UTC/GMT)

The central-header extra field contains the modification time only,
or no timestamp at all. TSize is used to flag its presence or
absence. But note: