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60 lines
1.9 KiB
JavaScript
60 lines
1.9 KiB
JavaScript
//---------------------------------------------------------------------
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//
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// QR Code Generator for JavaScript UTF8 Support (optional)
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//
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// Copyright (c) 2011 Kazuhiko Arase
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//
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// URL: http://www.d-project.com/
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//
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// Licensed under the MIT license:
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// http://www.opensource.org/licenses/mit-license.php
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//
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// The word 'QR Code' is registered trademark of
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// DENSO WAVE INCORPORATED
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// http://www.denso-wave.com/qrcode/faqpatent-e.html
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//
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//---------------------------------------------------------------------
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!function(qrcode) {
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//---------------------------------------------------------------------
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// overwrite qrcode.stringToBytes
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//---------------------------------------------------------------------
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qrcode.stringToBytes = function(s) {
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// http://stackoverflow.com/questions/18729405/how-to-convert-utf8-string-to-byte-array
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function toUTF8Array(str) {
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var utf8 = [];
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for (var i=0; i < str.length; i++) {
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var charcode = str.charCodeAt(i);
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if (charcode < 0x80) utf8.push(charcode);
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else if (charcode < 0x800) {
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utf8.push(0xc0 | (charcode >> 6),
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0x80 | (charcode & 0x3f));
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}
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else if (charcode < 0xd800 || charcode >= 0xe000) {
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utf8.push(0xe0 | (charcode >> 12),
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0x80 | ((charcode>>6) & 0x3f),
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0x80 | (charcode & 0x3f));
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}
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// surrogate pair
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else {
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i++;
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// UTF-16 encodes 0x10000-0x10FFFF by
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// subtracting 0x10000 and splitting the
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// 20 bits of 0x0-0xFFFFF into two halves
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charcode = 0x10000 + (((charcode & 0x3ff)<<10)
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| (str.charCodeAt(i) & 0x3ff));
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utf8.push(0xf0 | (charcode >>18),
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0x80 | ((charcode>>12) & 0x3f),
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0x80 | ((charcode>>6) & 0x3f),
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0x80 | (charcode & 0x3f));
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}
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}
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return utf8;
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}
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return toUTF8Array(s);
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};
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}(qrcode);
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