react-qrcode-component/lib/utils/index.js

react qrcode qr.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.convertStr = convertStr;

// Convert from UTF-16, forcing the use of byte-mode encoding in our QR Code.
// This allows us to encode Hanji, Kanji, emoji, etc. Ideally we'd do more
// detection and not resort to byte-mode if possible, but we're trading off
// a smaller library for a smaller amount of data we can potentially encode.
// Based on http://jonisalonen.com/2012/from-utf-16-to-utf-8-in-javascript/
function convertStr(str) {
  var out = '';

  for (var i = 0; i < str.length; i++) {
    var charcode = str.charCodeAt(i);

    if (charcode < 0x0080) {
      out += String.fromCharCode(charcode);
    } else if (charcode < 0x0800) {
      out += String.fromCharCode(0xc0 | charcode >> 6);
      out += String.fromCharCode(0x80 | charcode & 0x3f);
    } else if (charcode < 0xd800 || charcode >= 0xe000) {
      out += String.fromCharCode(0xe0 | charcode >> 12);
      out += String.fromCharCode(0x80 | charcode >> 6 & 0x3f);
      out += String.fromCharCode(0x80 | charcode & 0x3f);
    } else {
      // This is a surrogate pair, so we'll reconsitute the pieces and work
      // from that
      i++;
      charcode = 0x10000 + ((charcode & 0x3ff) << 10 | str.charCodeAt(i) & 0x3ff);
      out += String.fromCharCode(0xf0 | charcode >> 18);
      out += String.fromCharCode(0x80 | charcode >> 12 & 0x3f);
      out += String.fromCharCode(0x80 | charcode >> 6 & 0x3f);
      out += String.fromCharCode(0x80 | charcode & 0x3f);
    }
  }

  return out;
}