I’ve just updated the ruby barcode generator software to add EAN-13 capabilities (which will include UPC-A). This is pure ruby code to generate patterns for 1-dimensional barcodes. Download at http://github.com/mdchaney/Barcode1DTools
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Code Available
I have made a lot of code available at GitHub:
Right now you can find 1D barcode generation code written in Perl, 3 maze generators written (and highly commented) in JavaScript, a JavaScript sprintf function, and a plugin for CarrierWave to store image information. More coming as I have time.