if (charset.equals(UTF_8)) {
      int utf16Length = input.length();
      int h1 = seed;
      int i = 0;
      int len = 0;

      // This loop optimizes for pure ASCII.
      while (i + 4 <= utf16Length) {
        char c0 = input.charAt(i);
        char c1 = input.charAt(i + 1);
        char c2 = input.charAt(i + 2);
        char c3 = input.charAt(i + 3);

    checkArgument(!token.isEmpty());
    return Ascii.toLowerCase(token);
  }

  private static String normalizeParameterValue(String attribute, String value) {
    checkNotNull(value); // for GWT
    checkArgument(ascii().matchesAllOf(value), "parameter values must be ASCII: %s", value);
    return attribute.equals(CHARSET_ATTRIBUTE) ? Ascii.toLowerCase(value) : value;
  }

  /**

func hasNUL(s string) bool {
	return strings.Contains(s, "\x00")
}

// isASCII reports whether the input is an ASCII C-style string.
func isASCII(s string) bool {
	for _, c := range s {
		if c >= 0x80 || c == 0x00 {
			return false
		}
	}
	return true
}

// toASCII converts the input to an ASCII C-style string.
// This is a best effort conversion, so invalid characters are dropped.
func toASCII(s string) string {

    private final int c;
    // The number of finalization rounds.
    private final int d;

    // Four 64-bit words of internal state.
    // The initial state corresponds to the ASCII string "somepseudorandomlygeneratedbytes",
    // big-endian encoded. There is nothing special about this value; the only requirement
    // was some asymmetry so that the initial v0 and v1 differ from v2 and v3.

  static final String I18N =
      "\u00CE\u00F1\u0163\u00E9\u0072\u00F1\u00E5\u0163\u00EE\u00F6"
          + "\u00F1\u00E5\u013C\u00EE\u017E\u00E5\u0163\u00EE\u00F6\u00F1";

  static final String ASCII =
      " !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ"
          + "[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~";

  private File testDir;
  private File tempDir;

To do this, run the following command:

```bash
gpg --sign-key 1BD97A6A154E7810EE0BC832E2F38302C8075E3D
```

## Public Key Block in ascii-armored format

```
-----BEGIN PGP PUBLIC KEY BLOCK-----

mQINBGOtCzoBEAC7hGOPLFnfvQKzCZpJb3QYq8X9OiUL4tVa5mG0lDTeBBiuQCDy
Iyhpo8IypllGG6Wxj6ZJbhuHXcnXSu/atmtrnnjARMvDnQ20jX77B+g39ZYuqxgw

            // no password in tree connect
            dst[dstIndex++] = (byte) 0x00;
        }
        dstIndex += writeString(path, dst, dstIndex);
        try {
            System.arraycopy(service.getBytes("ASCII"), 0, dst, dstIndex, service.length());
        } catch (final UnsupportedEncodingException uee) {
            return 0;
        }
        dstIndex += service.length();
        dst[dstIndex] = (byte) '\0';

	}
	return formattedName
}

var (
	// https://github.com/golang/lint/blob/master/lint.go#L770
	commonInitialisms         = []string{"API", "ASCII", "CPU", "CSS", "DNS", "EOF", "GUID", "HTML", "HTTP", "HTTPS", "ID", "IP", "JSON", "LHS", "QPS", "RAM", "RHS", "RPC", "SLA", "SMTP", "SSH", "TLS", "TTL", "UID", "UI", "UUID", "URI", "URL", "UTF8", "VM", "XML", "XSRF", "XSS"}

        final int start = dstIndex;
        byte[] descr;
        final int which = subCommand == NET_SERVER_ENUM2 ? 0 : 1;

        try {
            descr = DESCR[which].getBytes("ASCII");
        } catch (final UnsupportedEncodingException uee) {
            return 0;
        }

        writeInt2(subCommand & 0xFF, dst, dstIndex);
        dstIndex += 2;

        assertArrayEquals(expectedBytes, actualBytes);

        // Verify it's actually UTF-16LE (each ASCII char should be followed by 0x00)
        int pathStart = Smb2Constants.SMB2_HEADER_LENGTH + 8;
        for (int i = 0; i < testPath.length(); i++) {
            char c = testPath.charAt(i);
            if (c < 128) { // ASCII character
                assertEquals(c, buffer[pathStart + i * 2]);