function mapChar(codePoint) {
  if (codePoint >= 0x30000) {
    // High planes are special cased.
    if (codePoint >= 0xE0100 && codePoint <= 0xE01EF)
      return 18874368;
    return 0;
  }
  return blocks[blockIdxes[codePoint >> 4]][codePoint & 15];
}
Base URL for intents to Authenticator.
@const
@private