InputStream s = new ByteArrayInputStream(new byte[] { 0x0A });
        int length = ASN1Util.readLength(s, 100, false);
        assertEquals(10, length);
    }

    @Test
    void testReadLength_LongForm() throws IOException {
        // Definite-length long form (length 256)
        InputStream s = new ByteArrayInputStream(new byte[] { (byte) 0x82, 0x01, 0x00 });
        int length = ASN1Util.readLength(s, 500, false);