*
         * This method reads characters from the reader and processes them according to the following rules:
         * - ISO control characters and space characters are treated as spaces.
         * - Alphanumeric characters (0-9, A-Z, a-z) are appended to the buffer.
         * - Symbol characters (!-/, :-@, [-`, {-~) are appended to the buffer.

    @Required
    @Size(max = 100)
    public String username;

    /** The password for file authentication (maximum 100 characters). */
    @Size(max = 100)
    public String password;

    /** Additional parameters for file authentication (maximum 1000 characters). */
    @Size(max = 1000)
    public String parameters;

/**
 * A {@code UnicodeEscaper} that escapes some set of Java characters using a UTF-8 based percent
 * encoding scheme. The set of safe characters (those which remain unescaped) can be specified on
 * construction.
 *
 * <p>This class is primarily used for creating URI escapers in {@link UrlEscapers} but can be used
 * directly if required. While URI escapers impose specific semantics on which characters are

 *
 *  * In queries, ' ' is encoded to '+' and '+' is encoded to "%2B".
 *
 *  * Characters in `encodeSet` are percent-encoded.
 *
 *  * Control characters and non-ASCII characters are percent-encoded.
 *
 *  * All other characters are copied without transformation.
 *
 * @param alreadyEncoded true to leave '%' as-is; false to convert it to '%25'.

     * The name of the access token.
     * This is a required field with a maximum length of 1000 characters.
     */
    @Required
    @Size(max = 1000)
    public String name;

    /**
     * The actual access token string.
     * This is the token value that will be used for authentication.
     * Maximum length is 10000 characters.
     */
    @Size(max = 10000)
    public String token;

    /**

  static final String URL_FORM_PARAMETER_OTHER_SAFE_CHARS = "-_.*";

  static final String URL_PATH_OTHER_SAFE_CHARS_LACKING_PLUS =
      "-._~" // Unreserved characters.
          + "!$'()*,;&=" // The subdelim characters (excluding '+').
          + "@:"; // The gendelim characters permitted in paths.

  /**
   * Returns an {@link Escaper} instance that escapes strings so they can be safely included in <a

 * <td>bytes</td>
 * <td>characters</td>
 * <td>bytes, characters</td>
 * <td>characters</td>
 * </tr>
 * <tr>
 * <th>{@link Reader}</th>
 * <td>characters</td>
 * <td>characters</td>
 * <td>characters</td>
 * <td>characters</td>
 * </tr>
 * <tr>
 * <th>{@link File}</th>
 * <td>bytes</td>
 * <td>characters</td>
 * <td>bytes, characters</td>
 * <td>characters</td>
 * </tr>
 * <tr>

    // which means they are treated as pairs of safe characters).
    builder.setSafeRange(Character.MIN_VALUE, '\uFFFD');
    // Unsafe characters are replaced with the Unicode replacement character.
    builder.setUnsafeReplacement("\uFFFD");

    /*
     * Except for \n, \t, and \r, all ASCII control characters are replaced with the Unicode
     * replacement character.
     *

        // Test common special characters
        assertTrue(CharUtil.isUrlChar('.'));
        assertTrue(CharUtil.isUrlChar('-'));
        assertTrue(CharUtil.isUrlChar('*'));
        assertTrue(CharUtil.isUrlChar('_'));
    }

    public void test_isUrlChar_urlSpecialChars() {
        // Test URL-specific special characters
        assertTrue(CharUtil.isUrlChar(':'));

 *
 * This class provides methods to escape special characters in XML strings,
 * strip invalid XML characters, and parse XML content into a map of data.
 *
 * <p>
 * The class is final and cannot be instantiated.
 * </p>
 *
 * <h2>Methods:</h2>
 * <ul>
 *   <li>{@link #escapeXml(String)}: Escapes special characters in an XML string.</li>