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Empty ZIP files not recognized #23

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sandrock opened this issue Aug 3, 2018 · 1 comment
Open

Empty ZIP files not recognized #23

sandrock opened this issue Aug 3, 2018 · 1 comment

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@sandrock
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sandrock commented Aug 3, 2018

Empty ZIP files are a special kind of ZIP. The header differs.

File contents: 50 4b 05 06 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

Calling GetFileType(this byte[] bytes) returns null.

$ file -i ZIPempty.zip
ZIPempty.zip: application/zip; charset=binary
@sandrock
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sandrock commented Aug 7, 2018

A ZIP header should start with 0x04034b50 but mine starts with 0x06054b50.

.ZIP File Format Specification at section "4.3.16 End of central directory record" says that my header looks like a "end of central dir signature".

Steps to recreate this file:

  • have 7Zip on your machine
  • using windows explorer, select a file, context menu, 7zip, "add to .zip archive"
  • open the archive using 7zip and delete the files

Do you think this makes a corrupted zip? Or is it legit?

@pyDez pyDez mentioned this issue Oct 9, 2018
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@sandrock