Scanning a local file headers is not necessary (except in the case of corrupted archives)

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Scanning a local file headers is not necessary (except in the case of corrupted archives) https://en.wikipedia.org/wiki/ZIP_(file_format)#Structure

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compressed size: (4 bytes)
uncompressed size: (4 bytes)
The size of the file compressed and uncompressed,respectively. If bit 3 of the general purpose bit flag is set, these fields are set to zero in the local header and the correct values are put in the data descriptor and in the central directory. If an archive is in zip64 format and the value in this field is 0xFFFFFFFF, the size will be in the corresponding 8 byte zip64 extended information extra field.

https://pkware.cachefly.net/webdocs/APPNOTE/APPNOTE-5.2.0.txt