title: dealing with binary file in R
body: <p>I have a .zip file in R that I received through an httr get request (which involved authentication headers, and whatnot, so I can't just use download.file), but it's all some binary gook in memory.</p>
  
  <p>I want to unzip specific files out of it, but I can't figure out how to do that thing, since the unzip method takes a file path, and not the file data.  For that matter, I can't figure out how to even write it to disk... I can't figure out how to do a single thing with it.</p>
  
  <p>viz:</p>
  
  <pre><code>&gt; content(a)
  [1] 50 4b 03 04 0a 00 00 0 ...
  </code></pre>
  
  <p>halp!</p>