How to use

_BASE64_LOOKUP

function

in

Array

static _tripletToBase64(num) {
    return BufferUtils._BASE64_LOOKUP[num >> 18 & 0x3F] + BufferUtils._BASE64_LOOKUP[num >> 12 & 0x3F] + BufferUtils._BASE64_LOOKUP[num >> 6 & 0x3F] + BufferUtils._BASE64_LOOKUP[num & 0x3F];
  }

  output += BufferUtils._BASE64_LOOKUP[tmp >> 2];
  output += BufferUtils._BASE64_LOOKUP[(tmp << 4) & 0x3F];
  output += '==';
} else if (extraBytes === 2) {
  tmp = (u8[len - 2] << 8) + (u8[len - 1]);
  output += BufferUtils._BASE64_LOOKUP[tmp >> 10];
  output += BufferUtils._BASE64_LOOKUP[(tmp >> 4) & 0x3F];
  output += BufferUtils._BASE64_LOOKUP[(tmp << 2) & 0x3F];
  output += '=';