title: Native rsync library?
body: <p>Do there exist any good rsync libraries that implement:</p>
  
  <ol>
  <li>The rsync algorithm and</li>
  <li>The rsync protocol</li>
  </ol>
  
  <p>Such that one could use the library to build the <code>rsync</code> tool itself?  (I want my application to be compatible with a normal rsync server or normal rsync over ssh.)</p>