}
    }

    // "002F" or "0000..002C"
    val sourceCodePoint0 = readHexadecimalUnsignedLong()
    val sourceCodePoint1 =
      when (select(optionsDot)) {
        DELIMITER_DOT -> {
          if (readByte() != '.'.code.toByte()) throw IOException("expected '..'")
          readHexadecimalUnsignedLong()
        }

        else -> {
          sourceCodePoint0
        }
      }

      // Read the suffix of the previous chunk.
      if (bytesRemainingInChunk != NO_CHUNK_YET) {
        socket.source.readUtf8LineStrict()
      }
      try {
        bytesRemainingInChunk = socket.source.readHexadecimalUnsignedLong()
        val extensions = socket.source.readUtf8LineStrict().trim()
        if ((bytesRemainingInChunk < 0L) || (extensions.isNotEmpty() && !extensions.startsWith(";"))) {
          throw ProtocolException(