udpclient.c

#include "quick.c"


int main(int argc, char **argv)
{

   int read_count=0;


   char buf[BUFSIZE];
   int retransmitted = 0;
   /* check command line arguments */
   if (argc != 3)
   {
      fprintf(stderr,"usage: %s <hostname> <port>\n", argv[0]);
      exit(0);
   }


   set_connection_to(argv[1],atoi(argv[2]));

   printf("Enter file name\n" );
   string filename_str;
   cin>>filename_str;

   int filesize=send_filename_and_size(filename_str,serveraddr,serverlen);



   FILE* fp = fopen(filename_str.c_str(), "rb");
   int ack_seq_num=0, to_trans=(filesize/1016)+1;
   int  remain_data = filesize,sent_bytes,nread,dont_read=0;


   init_send_modules(filesize,serveraddr,serverlen);
   init_receiver_modules(serveraddr,serverlen);


   unsigned char packet_buf[2*BUFSIZE-8]={0};
   while(1)
       {

           while(dont_read!=1)
           {
               memset(packet_buf,0,sizeof(packet_buf));
               nread = fread(packet_buf,1,2*BUFSIZE-8,fp);
               read_count++;
               if(nread<=0)
                   {
                       dont_read=1;
                       break;
                    }
               remain_data-=nread;
               app_send(packet_buf,nread);
           }

           if (remain_data==0)
           {
               printf("Finished reading the file\n");
               if (feof(fp))
               {
                   printf("File Sent\n");
                   printf("Number of retransmitted packets = %d\n",retransmitted);
               }
               if (ferror(fp))
                   printf("Error Sending file\n");
               break;
           }

       }
       fclose(fp);

       wait_till_data_sent();
       close_instance();

       close(sockfd);

//////////////

       return 0;
}