why zip64_limit defined as 1<<31 -1?

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Date	Wed, 28 Jan 2015 10:53:43 -0800
Subject	why zip64_limit defined as 1<<31 -1?
From	jesse <chat2jesse@gmail.com>
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should not it be 1<<32 -1(4g)?

normal zip archive format should be able to support 4g file.

thanks

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why zip64_limit defined as 1<<31 -1? jesse <chat2jesse@gmail.com> - 2015-01-28 10:53 -0800

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