how to parse data format of NSE broadcast

*
 * File:   main.c
 * Author: root
 *
 * Created on May 17, 2011, 1:51 PM
 */

#include
#include
#include
#include
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "Include/lzo1z.h"

#define MAX_LEN 1024;

int main(int argc, char **argv)
{
    
    int sock;
    int flag_on = 1;
    struct sockaddr_in mc_addr;
    unsigned char recv_str[1024];
    int  recv_len;
    struct ip_mreq mc_req;
    char* mc_addr_str;
    unsigned short mc_port;
    struct sockaddr_in from_addr;
    unsigned int from_len;
    mc_addr_str = "233.1.1.11";
    mc_port     = 34330;
      
    if ((sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
    {
        perror("socket() failed");
        exit(1);
    }

    if ((setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &flag_on, sizeof(flag_on))) < 0)
    {
        perror("setsockopt() failed");
        exit(1);
    }
    
    memset(&mc_addr,0,sizeof(mc_addr));
    mc_addr.sin_family = AF_INET;
    mc_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    mc_addr.sin_port = htons(mc_port);
    
    if((bind(sock,(struct sockaddr *) &mc_addr,sizeof(mc_addr))) < 0)
    {
        perror("bind() failed");
        exit(1);
    }
    
    mc_req.imr_multiaddr.s_addr = inet_addr(mc_addr_str);
    mc_req.imr_interface.s_addr = htonl(INADDR_ANY);
    
    if((setsockopt(sock,IPPROTO_IP,IP_ADD_MEMBERSHIP,(void*) &mc_req,sizeof(mc_req))) < 0)
    {
        perror("setsockopt() failed");
        exit(1);
    }
    
    
    for(;;)
    {
        memset(recv_str,0,sizeof(recv_str));
        from_len = sizeof(from_addr);
        memset(&from_addr,0,from_len);
        
       if((recv_len = recvfrom(sock, recv_str,1024,0,(struct sockaddr*)&mc_addr, &from_len))<0)                
        {
            perror("recvfrom() failed");
            exit(1);
        }
        short compLen=0;
        short NOP=0;
        memcpy(&compLen,recv_str+4,2);
        compLen = ntohs(compLen);
        if(compLen > 0)
        {
            memcpy(&NOP,recv_str+2,2);
            NOP=ntohs(NOP);
            int i=0;
           
            
            for(i=0;i<nop;i++)>
            {
                unsigned char src[compLen];
                memcpy(&src,recv_str+6,compLen);
                short src_len = compLen;
                unsigned int dst_len = 1024;
                unsigned char dst[1024];
                int rCode;
                unsigned int eCode=0;
                               
                
                rCode = lzo1z_decompress((lzo_bytep) src,(lzo_uint)src_len,(lzo_bytep) dst,(lzo_uintp)&dst_len,0);
                
               
            }
        }
    }
    
    if((setsockopt(sock, IPPROTO_IP, IP_DROP_MEMBERSHIP,(void*)&mc_req, sizeof(mc_req))) < 0)
    {
        perror("setsocketopt() failed");
        exit(1);
        
    }
    close(sock);
    return 0;
}</unistd.h></string.h></stdlib.h></stdio.h>