refactor(Util): remove convertToBuffer (#5237)

src/util/Util.js

@@ -297,30 +297,6 @@ class Util {
     return given;
   }
 
-  /**
-   * Converts an ArrayBuffer or string to a Buffer.
-   * @param {ArrayBuffer|string} ab ArrayBuffer to convert
-   * @returns {Buffer}
-   * @private
-   */
-  static convertToBuffer(ab) {
-    if (typeof ab === 'string') ab = Util.str2ab(ab);
-    return Buffer.from(ab);
-  }
-
-  /**
-   * Converts a string to an ArrayBuffer.
-   * @param {string} str String to convert
-   * @returns {ArrayBuffer}
-   * @private
-   */
-  static str2ab(str) {
-    const buffer = new ArrayBuffer(str.length * 2);
-    const view = new Uint16Array(buffer);
-    for (var i = 0, strLen = str.length; i < strLen; i++) view[i] = str.charCodeAt(i);
-    return buffer;
-  }
-
   /**
    * Makes an Error from a plain info object.
    * @param {Object} obj Error info