*       which operate only on the ASCII characters of a string.
 * </ul>
 *
 * @author Catherine Berry
 * @author Gregory Kick
 * @since 7.0
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public final class Ascii {

  private Ascii() {}

  /* The ASCII control characters, per RFC 20. */
  /**

 *       which operate only on the ASCII characters of a string.
 * </ul>
 *
 * @author Catherine Berry
 * @author Gregory Kick
 * @since 7.0
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public final class Ascii {

  private Ascii() {}

  /* The ASCII control characters, per RFC 20. */
  /**

  }

  public void testToString() throws IOException {
    File asciiFile = getTestFile("ascii.txt");
    File i18nFile = getTestFile("i18n.txt");
    assertEquals(ASCII, Files.toString(asciiFile, Charsets.US_ASCII));
    assertEquals(I18N, Files.toString(i18nFile, Charsets.UTF_8));
    assertThat(Files.toString(i18nFile, Charsets.US_ASCII)).isNotEqualTo(I18N);
  }

  public void testWriteString() throws IOException {

    }


    @Test
    public void testAES256Checksum () throws GeneralSecurityException {
        String data = "fourteen";
        String key = "B1AE4CD8462AFF1677053CC9279AAC30B796FB81CE21474DD3DDBCFEA4EC76D7";
        String expect = "E08739E3279E2903EC8E3836";
        verifyAESHMAC(4, expect, key, data.getBytes(StandardCharsets.US_ASCII));
    }


    /**

    StringBuilder builder = new StringBuilder();
    long copied =
        CharStreams.copy(
            wrapAsGenericReadable(new StringReader(ASCII)), wrapAsGenericAppendable(builder));
    assertEquals(ASCII, builder.toString());
    assertEquals(ASCII.length(), copied);

    StringBuilder builder2 = new StringBuilder();
    copied =
        CharStreams.copy(

    StringBuilder builder = new StringBuilder();
    long copied =
        CharStreams.copy(
            wrapAsGenericReadable(new StringReader(ASCII)), wrapAsGenericAppendable(builder));
    assertEquals(ASCII, builder.toString());
    assertEquals(ASCII.length(), copied);

    StringBuilder builder2 = new StringBuilder();
    copied =
        CharStreams.copy(

  }

  public void testToString() throws IOException {
    File asciiFile = getTestFile("ascii.txt");
    File i18nFile = getTestFile("i18n.txt");
    assertEquals(ASCII, Files.toString(asciiFile, Charsets.US_ASCII));
    assertEquals(I18N, Files.toString(i18nFile, Charsets.UTF_8));
    assertThat(Files.toString(i18nFile, Charsets.US_ASCII)).isNotEqualTo(I18N);
  }

  public void testWriteString() throws IOException {

// given ASCII character in the set. The 128-bits of the lower 16 bytes,
// starting with the least-significant bit of the lowest word to the
// most-significant bit of the highest word, map to the full range of all
// 128 ASCII characters. The 128-bits of the upper 16 bytes will be zeroed,
// ensuring that any non-ASCII character will be reported as not in the set.

   *
   * <p>This method accepts non-ASCII digits, for example {@code "１９２.１６８.０.１"} (those are fullwidth
   * characters). That is consistent with {@link InetAddress}, but not with various RFCs. If you
   * want to accept ASCII digits only, you can use something like {@code
   * CharMatcher.ascii().matchesAllOf(ipString)}.
   *

   * Parses the specified string as a signed decimal long value. The ASCII character {@code '-'} (
   * <code>'&#92;u002D'</code>) is recognized as the minus sign.
   *
   * <p>Unlike {@link Long#parseLong(String)}, this method returns {@code null} instead of throwing
   * an exception if parsing fails. Additionally, this method only accepts ASCII digits, and returns
   * {@code null} if non-ASCII digits are present in the string.
   *