<function>
    <description>
      Returns formatted number as a file size from a given value.
    </description>
    <name>formatFileSize</name>
    <function-class>org.codelibs.fess.taglib.FessFunctions</function-class>
    <function-signature>java.lang.String formatFileSize(long)</function-signature>
    <example>
      ${fe:formatFileSize(doc.content_length)}
    </example>
  </function>

  <function>

        assertEquals("0", FessFunctions.formatFileSize(0));
        assertEquals("1000", FessFunctions.formatFileSize(1000));
        assertEquals("976.6K", FessFunctions.formatFileSize(1000000));
        assertEquals("953.7M", FessFunctions.formatFileSize(1000000000));
        assertEquals("931.3G", FessFunctions.formatFileSize(1000000000000L));
        assertEquals("909.5T", FessFunctions.formatFileSize(1000000000000000L));
    }

    @Test

     *
     * @param value the file size in bytes
     * @return formatted file size string (e.g., "1.5M", "2.3G", "512K")
     */
    public static String formatFileSize(final long value) {
        double target = value;
        String unit = ""; // TODO l10n?
        String format = "0.#";
        if (value < 1024) {
            format = "0";