checkNotDestroyed();

        if (ciphertext == null || ciphertext.length <= GCM_IV_SIZE) {
            return null;
        }

        // Extract IV and ciphertext
        byte[] iv = new byte[GCM_IV_SIZE];
        System.arraycopy(ciphertext, 0, iv, 0, GCM_IV_SIZE);

        byte[] encryptedData = new byte[ciphertext.length - GCM_IV_SIZE];

// sumHMAC calculate hmac between two input byte array.
func sumHMAC(key []byte, data []byte) []byte {
	hash := hmac.New(sha256.New, key)
	hash.Write(data)
	return hash.Sum(nil)
}

// extractSignedHeaders extract signed headers from Authorization header
func extractSignedHeaders(signedHeaders []string, r *http.Request) (http.Header, APIErrorCode) {
	reqHeaders := r.Header
	reqQueries := r.Form

				"X-Amz-Content-Sha256": payloadSHA256,
			},
			region:   "us-west-1",
			expected: ErrUnsignedHeaders,
		},
		// (3) Should fail to extract headers if the host header is not signed.
		{
			queryParams: map[string]string{
				"X-Amz-Algorithm":      signV4Algorithm,
				"X-Amz-Date":           now.Format(iso8601Format),
				"X-Amz-Expires":        "60",

            int action = SMBUtil.readInt4(outputBuffer, offset + 4);
            int fileNameLength = SMBUtil.readInt4(outputBuffer, offset + 8);

            // Extract filename
            byte[] fileNameBytes = new byte[fileNameLength];
            System.arraycopy(outputBuffer, offset + 12, fileNameBytes, 0, fileNameLength);

	m["accessKey"] = accessKey
	jwt := jwtgo.NewWithClaims(jwtgo.SigningMethodHS512, jwtgo.MapClaims(m))
	return jwt.SignedString([]byte(tokenSecret))
}

// ExtractClaims extracts JWT claims from a security token using a secret key
func ExtractClaims(token, secretKey string) (*jwt.MapClaims, error) {
	if token == "" || secretKey == "" {
		return nil, errors.New("invalid argument")
	}

		accessKey       string
		err             error
	)

	var unescapedQueries []string
	unescapedQueries, err = unescapeQueries(encodedQuery)
	if err != nil {
		return ErrInvalidQueryParams
	}

	// Extract the necessary values from presigned query, construct a list of new filtered queries.
	for _, query := range unescapedQueries {
		keyval := strings.SplitN(query, "=", 2)
		if len(keyval) != 2 {
			return ErrInvalidQueryParams

        }
    }

    /**
     * Runs the crawling process in a separate thread.
     * This method fetches URLs from the queue, accesses content, processes responses,
     * and extracts child URLs until the crawling process is done or no more URLs are available.
     */
    @Override
    public void run() {
        log(logHelper, LogType.START_THREAD, crawlerContext);
        int threadCheckCount = 0;

        description: Annotated[
            Optional[str],
            Doc(
                """
                A description for the *path operation*.

                If not provided, it will be extracted automatically from the docstring
                of the *path operation function*.

                It can contain Markdown.

                It will be added to the generated OpenAPI (e.g. visible at `/docs`).

        assertEquals(l.getShare(), copy.getShare());
        assertEquals(l.getType(), copy.getType());
        assertSame(l.getURL(), copy.getURL());
    }

    @ParameterizedTest
    @DisplayName("queryLookup extracts values case-insensitively")
    @CsvSource({ "a=1&b=2,a,1", "A=1&a=2,a,1", // first match before next param
            "x=foo&Server=name,server,name", "paramOnly=,paramOnly,''", "noeq&other=1,other,1" })

header_with_permalink_pattern = re.compile(r"^(#{1,6}) (.+?)(\s*\{\s*#.*\s*\})\s*$")
code_block3_pattern = re.compile(r"^\s*```")
code_block4_pattern = re.compile(r"^\s*````")


class VisibleTextExtractor(HTMLParser):
    """Extract visible text from a string with HTML tags."""

    def __init__(self):
        super().__init__()
        self.text_parts = []

    def handle_data(self, data):
        self.text_parts.append(data)