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bpo-28494: Improve zipfile.is_zipfile reliability The zipfile.is_zipfile function would only search for the EndOfZipfile section header. This failed to correctly identify non-zipfiles that contained this header. Now the zipfile.is_zipfile function verifies the first central directory entry. Changes: * Extended zipfile.is_zipfile to verify zipfile catalog * Added tests to validate failure of binary non-zipfiles * Reuse 'concat' handling for is_zipfile Co-authored-by: John Jolly <john.jolly@gmail.com> |
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