QR Code encoding library

 Libqrencode is a library for encoding data in a QR Code symbol, a kind of 2D
 symbology that can be scanned by handy terminals such as a mobile phone with
 CCD. The capacity of QR Code is up to 7000 digits or 4000 characters, and has
 high robustness.
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 Libqrencode supports QR Code model 2, described in JIS (Japanese Industrial
 Standards) X0510:2004 or ISO/IEC 18004.