Zip64 cannot be delete when it has more than one file

[zhuxb711]

Steps to reproduce

1.Create a zip64 which has multi file
2.BeginUpdate()
3.Delete one of the file ( Delete(ZipEntry entry) )
4.CommitUpdate()

Expected behavior

Without Error

Actual behavior

ZipException: Extra data extended Zip64 information length is invalid

Version of SharpZipLib

Ver. 1.1.0

Obtained from (only keep the relevant lines)

• Package installed using NuGet

[Numpsy]

Same as #59?

Would something like @ Numpsy@7867853 help? (looks like WriteCentralDirectoryHeader currently checks IsZip64Forced when deciding to write -1 to the base size fields but not when writing the extra data, so the length doesn't get written).
That seems anough to get the new test @ Numpsy@0fff917 passing at any rate,

[piksel]

That does indeed look like #59.

I have not delved into Zip64 much, but the current behaviour seems incorrect. @Numpsy Could you make a PR of this so that we get NuGet packages for testing?

[Numpsy]

PR sent - #314

[piksel]

@zhuxb711 Would you mind testing if this solves your issue by trying the nuget packages from here:
https://ci.appveyor.com/project/icsharpcode/sharpziplib/builds/21919853/job/ikxom0i3vlb0m3al/artifacts