SocksCommonUtils Class — netty Architecture

Source Code

codec-socks/src/main/java/io/netty/handler/codec/socks/SocksCommonUtils.java lines 20–58

final class SocksCommonUtils {
    public static final SocksRequest UNKNOWN_SOCKS_REQUEST = new UnknownSocksRequest();
    public static final SocksResponse UNKNOWN_SOCKS_RESPONSE = new UnknownSocksResponse();

    /**
     * A constructor to stop this class being constructed.
     */
    private SocksCommonUtils() {
        // NOOP
    }

    private static final char ipv6hextetSeparator = ':';

    /**
     * Converts numeric IPv6 to standard (non-compressed) format.
     */
    public static String ipv6toStr(byte[] src) {
        assert src.length == 16;
        StringBuilder sb = new StringBuilder(39);
        ipv6toStr(sb, src, 0, 8);
        return sb.toString();
    }

    private static void ipv6toStr(StringBuilder sb, byte[] src, int fromHextet, int toHextet) {
        int i;
        toHextet --;
        for (i = fromHextet; i < toHextet; i++) {
            appendHextet(sb, src, i);
            sb.append(ipv6hextetSeparator);
        }

        appendHextet(sb, src, i);
    }

    private static void appendHextet(StringBuilder sb, byte[] src, int i) {
        StringUtil.toHexString(sb, src, i << 1, 2);
    }

}