Robin Power created COMPRESS-215:
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Summary: 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
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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