RFR: 8313765: Invalid CEN header (invalid zip64 extra data field size) [v6]

Tue Aug 15 17:59:10 UTC 2023

On Tue, 15 Aug 2023 16:01:37 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

> Other than that there are no limitation on the size of extended block, it could be 0, 20, 100 , etc. But it should contain correct data if necessary and should not be larger than the surrounding "chunk".

This seems to be a very "free" interpretation of the specification to me. According to my understanding, the valid sizes of 8, 16, 24 or 28 as described in the Wikipedia article are a direct consequence of the specification which only allows for a fixed set of entries in the ZIP64 Extra Field. Already the zero-length case is questionable because a ZIP64 Extra Field should only be created if required, however we have to handle it here for backward compatibility reasons.

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PR Comment: https://git.openjdk.org/jdk/pull/15273#issuecomment-1679363319