}

    /**
     * 16進数の文字列に変換します。
     *
     * @param bytes
     *            バイトの配列
     * @return 16進数の文字列
     */
    public static String toHex(final byte[] bytes) {
        if (bytes == null) {
            return "";
        }
        final StringBuilder sb = new StringBuilder(bytes.length * 2);
        for (final byte b : bytes) {
            appendHex(sb, b);
        }

    public Object getData(final AccessResultData<?> accessResultData) {
        final byte[] data = accessResultData.getData();
        if (data != null) {
            try {
                return SerializeUtil.fromBinaryToObject(data);
            } catch (final Exception e) {
                throw new CrawlerSystemException("Could not create an instanced from bytes.", e);
            }
        }
        return new HashMap<String, Object>();

            throw new IORuntimeException(e);
        }
    }

    public static void writeBytes(final String pathname, final byte[] bytes) {
        try (FileOutputStream fos = OutputStreamUtil.create(new File(pathname))) {
            ChannelUtil.write(fos.getChannel(), ByteBuffer.wrap(bytes));
        } catch (final IOException e) {
            throw new IORuntimeException(e);
        }
    }

    File inputFile = URLUtil.toFile(url);

    /**
     * @throws Exception
     */
    @Test
    public void testFileToFile() throws Exception {
        final byte[] bytes = readBytes(inputFile);
        assertThat(bytes, is("あいうえお".getBytes("UTF-8")));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testReadUTF8() throws Exception {

        } else if (size.divide(ONE_KB_BI).compareTo(BigInteger.ZERO) > 0) {
            displaySize = new BigDecimal(size).divide(BigDecimal.valueOf(1000)) + "KB";
        } else {
            displaySize = size + "bytes";
        }
        return displaySize;
    }

    public static long getUsedMemory() {
        final Runtime runtime = Runtime.getRuntime();
        final long freeBytes = runtime.freeMemory();

        }
        else {
            javaChecksum = sun.security.krb5.internal.crypto.Aes256.calculateChecksum(keybytes, usage, bytes, 0, bytes.length);
        }

        byte[] mac = PacMac.calculateMacHMACAES(usage, makeKey(keybytes, keybytes.length == 16 ? 17 : 18), bytes);
        checkBytes(javaChecksum, mac);
        checkBytes(Hex.decode(expect), mac);
    }

            @Override
            protected byte[] getBoundary(final String contentType) { // for security
                final byte[] boundary = super.getBoundary(contentType);
                checkBoundarySize(contentType, boundary);
                return boundary;
            }
        };
    }

    protected void checkBoundarySize(final String contentType, final byte[] boundary) {

    }

    /**
     * {@literal byte}の配列をオブジェクトに変換します。
     *
     * @param bytes
     *            デシリアライズする配列。{@literal null}や空配列であってはいけません
     * @return 復元したオブジェクト
     */
    public static Object fromBinaryToObject(final byte[] bytes) {
        assertArgumentNotEmpty("bytes", bytes);

        try {
            final ByteArrayInputStream bais = new ByteArrayInputStream(bytes);

     *
     * BC no longer seems to allow that out of the box
     *
     * @param expectTag
     * @param in
     * @return coded bytes of the tagged object
     * @throws IOException
     */
    public static byte[] readUnparsedTagged(int expectTag, int limit, ASN1InputStream in) throws IOException {
        int ftag = in.read();
        int tag = readTagNumber(in, ftag);

                            dataMap.putAll(responseDataMap);
                        } catch (final Exception e) {
                            throw new CrawlerSystemException("Could not create an instance from bytes.", e);
                        }
                    }
                    crawlerStatsHelper.record(keyObj, StatsAction.ACCESSED);

                    // remove
                    String[] ignoreFields;