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/*
 * Copyright (c) 2020 maoyan.com
 * All rights reserved.
 *
 */
package com.dagm.devtool.utils;

import sun.net.util.IPAddressUtil;

/**
 * @author Guimu
 * @date 2020/02/15
 */
public class NetWorkUtils {

    public static boolean internalIp(String ip) {
        byte[] addr = IPAddressUtil.textToNumericFormatV4(ip);
        return internalIp(addr);
    }

    public static boolean internalIp(byte[] addr) {
        final byte b0 = addr[0];
        final byte b1 = addr[1];
        //10.x.x.x/8
        final byte SECTION_1 = 0x0A;
        //172.16.x.x/12
        final byte SECTION_2 = (byte) 0xAC;
        final byte SECTION_3 = (byte) 0x10;
        final byte SECTION_4 = (byte) 0x1F;
        //192.168.x.x/16
        final byte SECTION_5 = (byte) 0xC0;
        final byte SECTION_6 = (byte) 0xA8;
        switch (b0) {
            case SECTION_1:
                return true;
            case SECTION_2:
                if (b1 >= SECTION_3 && b1 <= SECTION_4) {
                    return true;
                }
            case SECTION_5:
                switch (b1) {
                    case SECTION_6:
                        return true;
                }
            default:
                return false;
        }
    }

}