BIT STUFFING

AIM:
           To write a program for bit stuffing.

ALGORITHM:
SERVER:

    STEP 1: Start
    STEP 2: Declare the variables for the socket
    STEP 3: Specify the family, protocol, IP address and port number
    STEP 4: Create a socket using socket() function
    STEP 5: Bind the IP address and Port number
    STEP 6: Listen and accept the client’s request for the connection
    STEP 7: Establish the connection with the client
    STEP 8: Display the file name
    STEP 9: Dispaly the input message
    STEP 10: Dispaly the output message after bit stuffing
    STEP 11: Close the socket
    STEP 12: Stop
CLIENT:
    STEP 1: Start
    STEP 2: Declare the variables for the socket
    STEP 3:  Specify the family, protocol, IP address and port number
    STEP 4: Create a socket using socket() function
    STEP 5: Call the connect() function
    STEP 6: Read the file name
    STEP 7: Send the file name to the server
    STEP 8: Close the socket
    STEP 9: Stop

SOURCE CODE:
SERVER:

#include<stdio.h>
#include<arpa/inet.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<netdb.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#define SERV_TCP_PORT 5035
#define MAX 60
void stuff();
int i,j,tem;
char buff[4096],t;
FILE *f1;
int main(int arg,char **argv)
{
        int sockfd,newsockfd,clength;
        struct sockaddr_in serv_addr,cli_addr;
        char t[MAX],str[MAX];
        strcpy(t,"exit");
        sockfd=socket(AF_INET,SOCK_STREAM,0);
        serv_addr.sin_family=AF_INET;
        serv_addr.sin_addr.s_addr=INADDR_ANY;
        serv_addr.sin_port=htons(SERV_TCP_PORT);
        printf("\nBinded");
        bind(sockfd,(struct sockaddr*)&serv_addr,sizeof(serv_addr));
        printf("\nListening...\n");
        listen(sockfd,5);
        clength=sizeof(cli_addr);
        newsockfd=accept(sockfd,(struct sockaddr*)&cli_addr,&clength);
        close(sockfd);
        read(newsockfd,&str,MAX);
        printf("\nClient Message \nFile Name:\t%s\n",str);
        f1=fopen(str,"r");
        while(fgets(buff,4096,f1)!=NULL)
        {
                stuff();
                write(newsockfd,buff,MAX);
                printf("\n");
        }
        fclose(f1);
        return 0;
}

void stuff()
{
        i=j=tem=0;
        printf("\nInput :  %s",buff);
        printf("\nOutput : ");
        do
        {
         if(buff[i]=='1')
          {
          if(j==4)
           {
           tem=i-4;
           t='0';
           for(;tem<=i;tem++)
            printf("%c",buff[tem]);
           j=-1;
           printf("%c",t);
          }
          i+=1;
          j+=1;
          }
        else
        {
        tem=i;
        tem=tem-j;
        for(;tem<=i;tem++)
         printf("%c",buff[tem]);
        i+=1;
        j=0;
        }
  }while(buff[i]!='\0');
 }

CLIENT:
#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<netdb.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#define SERV_TCP_PORT 5035
#define MAX 60
int main(int argc,char **argv)
{
       int sockfd,n;
       struct sockaddr_in serv_addr;
       struct hostent *server;
       char send[MAX],recvline[MAX],s[MAX],name[MAX];
       sockfd=socket(AF_INET,SOCK_STREAM,0);
       serv_addr.sin_family=AF_INET;
       serv_addr.sin_addr.s_addr=inet_addr("127.0.0.1");
       serv_addr.sin_port=htons(SERV_TCP_PORT);
       connect(sockfd,(struct sockaddr*)&serv_addr,sizeof(serv_addr));
       printf("\nEnter the source file name:\n");
       scanf("%s",send);
       write(sockfd,send,MAX);
       while((n=read(sockfd,recvline,MAX))!=0)
       {
           printf("%s",recvline);
       }
       close(sockfd);
       return 0;
}

OUTPUT:
SERVER:



















CLIENT:



RESULT:
    Thus the program for bit stuffing was executed and the output was verified.
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