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From "Will Pugh (JIRA)" <>
Subject [jira] Updated: (SANDBOX-183) Compress should allow for writing to Zip Files
Date Wed, 04 Jul 2007 00:45:13 GMT


Will Pugh updated SANDBOX-183:

I fixed the style concerns, but did not fix the allocation size issue yet.  Should not be
hard to do, and it should be done.

I'm not sure how you plan to modify a zip file, whether you do it the "temp file" way or the
"change in place" way, where a process crash would not create a corrupted version of the file.

Traditionally, you would do this by creating a temporary zip file, and doing a "mv" on it,
so the name changed to the new name, but no data needed to be moved.  I'm not sure you can
do this in Java, unless you had planned on shelling out the OS (and detecting different OSes
to do this).

There were two main reasons I wanted to do this in memory:

  1)  So you would not need any type of temp directory
  2)  The performance differences can be VAST in some cases.  Imagine dealing with large XML
or text files, or anything where the compression is significant.  If you do the temp file
approach, you need to uncompress everything, and write it to a file.  Then, re-open all those
files and re-compress them.  This is not only a lot more CPU time in compressing and uncompressing,
but also a lot more data-movement using the disk drive.

> Compress should allow for writing to Zip Files
> ----------------------------------------------
>                 Key: SANDBOX-183
>                 URL:
>             Project: Commons Sandbox
>          Issue Type: New Feature
>          Components: Compress
>    Affects Versions: Nightly Builds
>            Reporter: Will Pugh
>         Attachments:,
> Compress should be able to modify existing ZipFiles.

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