ip2region_private/maker/csharp/DbMaker/IndexBlock.cs

namespace DbMaker
{

    /**
     * item index class
     * 
     * @author chenxin<chenxin619315@gmail.com>
    */
    public class IndexBlock
    {
        private static int LENGTH = 12;

        /**
         * start ip address 
        */
        private long startIp;

        /**
         * end ip address 
        */
        private long endIp;

        /**
         * data ptr and data length 
        */
        private int dataPtr;

        /**
         * data length 
        */
        private int dataLen;

        public IndexBlock(long startIp, long endIp, int dataPtr, int dataLen)
        {
            this.startIp = startIp;
            this.endIp = endIp;
            this.dataPtr = dataPtr;
            this.dataLen = dataLen;
        }

        public long getStartIp()
        {
            return startIp;
        }

        public IndexBlock setStartIp(long startIp)
        {
            this.startIp = startIp;
            return this;
        }

        public long getEndIp()
        {
            return endIp;
        }

        public IndexBlock setEndIp(long endIp)
        {
            this.endIp = endIp;
            return this;
        }

        public int getDataPtr()
        {
            return dataPtr;
        }

        public IndexBlock setDataPtr(int dataPtr)
        {
            this.dataPtr = dataPtr;
            return this;
        }

        public int getDataLen()
        {
            return dataLen;
        }

        public IndexBlock setDataLen(int dataLen)
        {
            this.dataLen = dataLen;
            return this;
        }

        public static int getIndexBlockLength()
        {
            return LENGTH;
        }

        /**
     * get the bytes for storage
     * 
     * @return    byte[]
    */
        public byte[] getBytes()
        {
            /*
             * +------------+-----------+-----------+
             * | 4bytes        | 4bytes    | 4bytes    |
             * +------------+-----------+-----------+
             *  start ip      end ip      data ptr + len 
            */
            byte[] b = new byte[12];

            Util.writeIntLong(b, 0, startIp); //start ip
            Util.writeIntLong(b, 4, endIp); //end ip

            //write the data ptr and the length
            long mix = dataPtr | ((dataLen << 24) & 0xFF000000L);
            Util.writeIntLong(b, 8, mix);

            return b;
        }
    }
}