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    <p>There are two RubyZip libraries that I was able to find.</p> <ol> <li><a href="http://www.chilkatsoft.com/ruby-zip.asp" rel="nofollow noreferrer">Chilkat's Ruby Zip Library</a></li> <li><a href="http://rubyzip.sourceforge.net/" rel="nofollow noreferrer">rubyzip on Sourceforge</a></li> </ol> <p>Chilkat's library definitely allows one to create a zip file in memory instead of writing it to disk automatically as seen in these links: <a href="http://www.example-code.com/ruby/ruby-zip-to-memory.asp" rel="nofollow noreferrer">Zip to Memory</a>, <a href="http://www.example-code.com/ruby/ruby-zip-from-memory.asp" rel="nofollow noreferrer">Zip from in memory data</a></p> <p>The one on SourceForge, on the other hand, may provide an option of zipping a file in memory but I'm not entirely certain since I'm very new to ruby. The SourceForge rubyzip is based on <code>java.util.zip</code> which has led to it having a class called <a href="http://rubyzip.sourceforge.net/classes/Zip/ZipOutputStream.html" rel="nofollow noreferrer"><code>ZipOutputStream</code></a>. I don't know how good the rubyzip implementation is, but with <code>java.util.zip</code> implementation the <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/io/OutputStream.html" rel="nofollow noreferrer"><code>OutputStream</code></a> can be set to <code>ByteArrayOutputStream</code>, <code>FileOutputStream</code>, <code>FilterOutputStream</code>, <code>ObjectOutputStream</code>, <code>OutputStream</code>, <code>PipedOutputStream</code>....</p> <p>If that holds true for the rubyzip implementation then it should be a matter of using <code>ZipOutputStream</code> to pass in a <code>ByteArrayOutputStream</code> of sorts which would result in it being output to memory.</p> <p>If it doesn't exist in rubyzip, then I'm sure you could always write your own implementation and submit it for inclusion in rubyzip seeing as it is opensource.</p>
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    1. POHow can I generate zip file without saving to the disk with Ruby?
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    1. COThe one I was referring was the gem: http://rubygems.org/gems/rubyzip I don't want to use the Chilkat library since there it's not open source.
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    2. COI won't downrate this, but I didn't find anywhere a comment like "no, the standard Ruby ZIP classes can NOT do this". I believe you should have started with it.
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    3. COIn fact the ZipOutputStream new method takes a file name as argument, I didn't find any way to pass an IO object.
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