md/src/assets/scripts/tokenTools.js

export function utf16to8(str) {
  var out, i, len, c;
  out = "";
  len = str.length;
  for (i = 0; i < len; i++) {
    c = str.charCodeAt(i);
    if (c >= 0x0001 && c <= 0x007f) {
      out += str.charAt(i);
    } else if (c > 0x07ff) {
      out += String.fromCharCode(0xe0 | ((c >> 12) & 0x0f));
      out += String.fromCharCode(0x80 | ((c >> 6) & 0x3f));
      out += String.fromCharCode(0x80 | ((c >> 0) & 0x3f));
    } else {
      out += String.fromCharCode(0xc0 | ((c >> 6) & 0x1f));
      out += String.fromCharCode(0x80 | ((c >> 0) & 0x3f));
    }
  }
  return out;
}

export function utf8to16(str) {
  var out, i, len, c;
  var char2, char3;
  out = "";
  len = str.length;
  i = 0;
  while (i < len) {
    c = str.charCodeAt(i++);
    switch (c >> 4) {
      case 0:
      case 1:
      case 2:
      case 3:
      case 4:
      case 5:
      case 6:
      case 7:
        // 0xxxxxxx
        out += str.charAt(i - 1);
        break;
      case 12:
      case 13:
        // 110x xxxx 10xx xxxx
        char2 = str.charCodeAt(i++);
        out += String.fromCharCode(((c & 0x1f) << 6) | (char2 & 0x3f));
        break;
      case 14:
        // 1110 xxxx 10xx xxxx 10xx xxxx
        char2 = str.charCodeAt(i++);
        char3 = str.charCodeAt(i++);
        out += String.fromCharCode(
          ((c & 0x0f) << 12) | ((char2 & 0x3f) << 6) | ((char3 & 0x3f) << 0)
        );
        break;
    }
  }
  return out;
}

const base64EncodeChars =
  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
const base64DecodeChars = new Array(
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  62,
  -1,
  -1,
  -1,
  63,
  52,
  53,
  54,
  55,
  56,
  57,
  58,
  59,
  60,
  61,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  0,
  1,
  2,
  3,
  4,
  5,
  6,
  7,
  8,
  9,
  10,
  11,
  12,
  13,
  14,
  15,
  16,
  17,
  18,
  19,
  20,
  21,
  22,
  23,
  24,
  25,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  26,
  27,
  28,
  29,
  30,
  31,
  32,
  33,
  34,
  35,
  36,
  37,
  38,
  39,
  40,
  41,
  42,
  43,
  44,
  45,
  46,
  47,
  48,
  49,
  50,
  51,
  -1,
  -1,
  -1,
  -1,
  -1
);
export function base64encode(str) {
  var out, i, len;
  var c1, c2, c3;
  len = str.length;
  i = 0;
  out = "";
  while (i < len) {
    c1 = str.charCodeAt(i++) & 0xff;
    if (i == len) {
      out += base64EncodeChars.charAt(c1 >> 2);
      out += base64EncodeChars.charAt((c1 & 0x3) << 4);
      out += "==";
      break;
    }
    c2 = str.charCodeAt(i++);
    if (i == len) {
      out += base64EncodeChars.charAt(c1 >> 2);
      out += base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xf0) >> 4));
      out += base64EncodeChars.charAt((c2 & 0xf) << 2);
      out += "=";
      break;
    }
    c3 = str.charCodeAt(i++);
    out += base64EncodeChars.charAt(c1 >> 2);
    out += base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xf0) >> 4));
    out += base64EncodeChars.charAt(((c2 & 0xf) << 2) | ((c3 & 0xc0) >> 6));
    out += base64EncodeChars.charAt(c3 & 0x3f);
  }
  return out;
}

export function base64decode(str) {
  var c1, c2, c3, c4;
  var i, len, out;
  len = str.length;
  i = 0;
  out = "";
  while (i < len) {
    /* c1 */
    do {
      c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
    } while (i < len && c1 == -1);
    if (c1 == -1) break;
    /* c2 */
    do {
      c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
    } while (i < len && c2 == -1);
    if (c2 == -1) break;
    out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));
    /* c3 */
    do {
      c3 = str.charCodeAt(i++) & 0xff;
      if (c3 == 61) return out;
      c3 = base64DecodeChars[c3];
    } while (i < len && c3 == -1);
    if (c3 == -1) break;
    out += String.fromCharCode(((c2 & 0xf) << 4) | ((c3 & 0x3c) >> 2));
    /* c4 */
    do {
      c4 = str.charCodeAt(i++) & 0xff;
      if (c4 == 61) return out;
      c4 = base64DecodeChars[c4];
    } while (i < len && c4 == -1);
    if (c4 == -1) break;
    out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
  }
  return out;
}

export function safe64(base64) {
  base64 = base64.replace(/\+/g, "-");
  base64 = base64.replace(/\//g, "_");
  return base64;
}