val result = mutableMapOf<Int, String>()
  val target = Buffer()
  while (!exhausted()) {
    skipWhitespace()
    val sourceCodePoint = readHexadecimalUnsignedLong().toInt()
    skipWhitespace()
    if (select(optionsSemicolon) != 0) throw IOException("expected ';'")
    skipWhitespace()
    while (select(optionsSemicolon) == -1) {
      val targetCodePoint = readHexadecimalUnsignedLong().toInt()