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#396 Headers Error

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None
5
2021-07-30
2021-07-27
testcy
No

I get a Headers Error in 21.03 beta when testing/extracting zip files created in Windows 10 with Send to Compressed (zipped) folder.

Discussion

  • Igor Pavlov

    Igor Pavlov - 2021-07-28

    Plese try to create some another small example of such archive and attach it here.

     
  • testcy

    testcy - 2021-07-28

    I can not create a small example of such archive, because the problem happens with large files (see attached screenshot).

     
  • Igor Pavlov

    Igor Pavlov - 2021-07-28

    Please try to find smallest size with error and write details:
    How many files in archive, and what uncompressed/compressed sizes?

     
  • testcy

    testcy - 2021-07-29

    Problem happens with a file of 3350 MB uncompressed size (or larger) in archive . It does not happen with a file of 3300 MB uncompressed size (or smaller) in archive.

     
  • Igor Pavlov

    Igor Pavlov - 2021-07-30

    Windows 10 Explorer's "Send to Zip" for big files (3500 MiB) creates Zip64 Extra block in local file header.
    But if both uncompressed and compressed sizes are smaller than 4 GiB, it doesn't store 0xFFFFFFFF in 32-bit fields as expected by Zip64 specification.
    So 7-Zip reports about that error.

    Probably I can change 7-Zip code, so it will ignore such minor errors in zip archive, created by Windows 10.

     

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