Commits on Mar 13, 2024

1. Zip: omit Disk Start Number from the Zip64 Central Directory Entry …

   Clause 4.5.3 of the PKWare spec clearly states that it MUST only appear in
   the Extra block when the corresponding field in the CDE (or LDE) was set to
   -1 (0xFFFF in the case of the Disk Start Number.)
   
   Previously, this would only be the case when Zip64 was presumed or the disk
   number was actually outside the range for the CDE. In every other case, the
   Disk Start Number would go into both locations, violating the spec.
   
   Some tools (such as 7-Zip) show warnings in this case, but often work as
   expected. Others (such as older versions of System.IO.Compression) follow
   the spec more stringently and will refuse to use the values from the Zip64
   Extra block when the related values do not match their expectation.
   
   However, fixing this to always write a conformant CDE that has its Disk
   Start Number as 0xFFFF with the actual value in the Extra block breaks other
   tools (such as marmelroy/Zip on iOS) that do not fully support Zip64.
   
   The spec does allow the Extra block to omit the Disk Start Number (and the
   Relativ Header Offset) when they fit in the CDE, so we do just that for
   general compatibility.
   
   Fixes haf#260

   

   BhaaLseN authored and René Mihula committed Mar 13, 2024
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