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https://issues.apache.org/jira/browse/COMPRESS-215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13557990#comment-13557990
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Stefan Bodewig commented on COMPRESS-215:
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As long as the ZIP format doesn't change your solution should work and in fact
speed up reading Zip32 archives, thanks!
> ZipFile reads up to 64KiB in a sequence of one byte reads
> ---------------------------------------------------------
>
> Key: COMPRESS-215
> URL: https://issues.apache.org/jira/browse/COMPRESS-215
> Project: Commons Compress
> Issue Type: Improvement
> Components: Archivers
> Affects Versions: 1.4.1
> Environment: JDK 1.7 64-bit, Windows 7
> Reporter: Robin Power
> Priority: Minor
> Attachments: COMPRESS-215.patch
>
>
> This relates to a performance improvement.
> When ZipFile is parsing a file it searches for the ZIP64 End Of Central
> Directory Locator as a first step to determining if the file is ZIP64 or
> regular 32 bit. It searches in reverse for the ZIP64 EOCDL signature from the
> end of the file reading one byte at a time, potentially up to about 64KiB.
> This can be an expensive operation, especially if it is not a ZIP64 file, as
> it will make over 64000 file reads to determine that the file is not ZIP64.
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