title: codeigniter upload encrypt_name uniqueness
body: <p><strong>1.</strong> Does codeigniter's upload library's <code>encrypt_name</code> option check to be unique?</p>
  
  <p>I know that the <code>overwrite</code> option is important. If <code>overwrite</code> is <code>TRUE</code>, it would overwrite and if it's <code>FALSE</code>, it would rename the file by adding a number at the end of the name.</p>
  
  <p>The question is: Will it <strong>regenerate</strong> the encrypted name until finding a unique name even if <code>overwrite</code> is <code>TRUE</code>? I ask this because it's obvious that when we want encrypted name, of course we don't want to overwrite.</p>
  
  <p>The problem with rename by adding some numbers is that it corrupts the size of file names. Many files will have 32 chars filename, and some might have 33 chars filename that corrupts coordination.</p>
  
  <p><strong>2.</strong> Is that possible to generate an ever-duplicated result at all?</p>