Libqrencode is a library for encoding data in a QR Code symbol, a 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.

Libqrencode accepts a string or a list of data chunks then encodes in a QR Code symbol as a bitmap array. While other QR Code applications generate an image file, using libqrencode allows applications to render QR Code symbols from raw bitmap data directly. This library also contains a command-line utility outputs a QR Code symbol as a PNG image.

Copyright (C) 2006-2012 Kentaro Fukuchi

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

QR Code is registered trademarks of DENSO WAVE INCORPORATED in JAPAN and other countries.

Reed-Solomon encoder is written by Phil Karn, KA9Q. Copyright (C) 2002, 2003, 2004, 2006 Phil Karn, KA9Q

BlueDragon747 - made changes for VS 2015 compatability NANKI Haruo - improved lower-case characteres encoding Philippe Delcroix - improved mask evaluation Yusuke Mihara - structured-append support David Dahl - DPI and SVG support patch Adam Shepherd - bug fix patch of the mask evaluation Josef Eisl (zapster) - EPS support patch Colin (moshen) - ANSI support patch Ralf Ertzinger - ASCII support patch Yutaka Niibe (gniibe) - various bug fix patches Dan Storm (Repox) - SVG support patch Lennart Poettering (mezcalero) - improved text art patch Yann Droneaud - improved input validation patch Viona - bug fix patch for string splitting Daniel Dörrhöfer - RLE option Shigeyuki Hirai, Paul Janssens, wangsai, Gavan Fantom, Matthew Baker, Rob Ryan, Fred Steinhaeuser, Terry Burton, chisj, vlad417, Petr, Hassan Hajji, Emmanuel Blot, ßlúèÇhîp, win32asm, Antenore, Yoshimichi Inoue

• bug report / suggestion