I've been searching the net for quite some time now for an API that can generate 1d barcodes (ie. EAN39). There are plenty of tools that can generate 2d barcodes (such as QR codes), but for some reason none that can generate 1d ones.
I've found a few web-based tools that can generate 1d barcodes one-by-one, but I'm looking for an API that I can use for generating thousands of barcodes.
Preferably something as straight-forward as Google Charts' QR API (http://code.google.com/apis/chart/docs/gallery/qr_codes.html)