title: How to set UPC-E not to expand to GTIN-13 iOS
body: <p>I am using ZBar iOS sdk to scan barcodes. Upon scanning UPC-E codes it adds up lots of zeros and brings 13 digit codes. </p>
  
  <p>When I check with Zbar's website, I came across this.</p>
  
  <blockquote>
    <p>UPC-E is a “zero compressed” version of UPC-A; certain of the zeros
    are removed from the UPC-A data to generate the UPC-E barcode. The
    ZBar decoder expands this compression by default, again to
    consistently report GTIN-13 product codes. <strong><em>You can choose to receive</em></strong>
    <strong><em>the compressed 8-digit</em></strong> results instead by explicitly enabling UPC-E.</p>
  </blockquote>
  
  <p>However, I couldn't find where to change this. </p>
  
  <p>Any suggestions? </p>