static base64Decode()

in encode/ts/src/client.ts [94:120]

• 26 lines of code
• 6 McCabe index (conditional complexity)

  static base64Decode(src: string): Buffer {
    /** Convert Base64 data to a string */
    var toBinaryTable = [-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, 0, -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
    ];
    var result = '';
    var leftbits = 0;
    var leftdata = 0;
    for (var i = 0; i < src.length; i++) {
      var c = toBinaryTable[src.charCodeAt(i) & 0x7f];
      var padding = (src.charCodeAt(i) == '='.charCodeAt(0));
      if (c == -1) continue;
      leftdata = (leftdata << 6) | c;
      leftbits += 6;
      if (leftbits >= 8) {
        leftbits -= 8;
        if (!padding)
          result += String.fromCharCode((leftdata >> leftbits) & 0xff);
        leftdata &= (1 << leftbits) - 1;
      }
    }
    if (leftbits)
      throw Error('Corrupted base64 string');
    return Buffer.from(result);
  }