리눅스 소켓통신에서 바이너리 데이터를 어떻게 보내야 될까요??

#define _GNU_SOURCE
#include
#include
#include
#include
#include
#include
#include
#include
#include"ls.c"
#define URL_LEN 256
#define BUFSIZE 1024
#define PORTNO 40206

int main(int argc, char **argv){
char buff[100],buff1[100];
getcwd(buff,100);
getcwd(buff1,100);

struct sockaddr_in server_addr, client_addr;
int socket_fd, client_fd;
int len,len_out;
int opt =1;

if((socket_fd = socket(PF_INET, SOCK_STREAM, 0)) <0) {
printf("Server : can't open stream socket\n");
return 0;
}

setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));

memset(&server_addr,0,sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(PORTNO);
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);

if(bind(socket_fd, (struct sockaddr *)&server_addr,sizeof(server_addr)) <0){
printf("Server : can't bind local address\n");
return 0;
}
listen(socket_fd ,5);

/// 소켓 open

while(1)
{

struct in_addr inet_client_address;
char buf[BUFSIZE] = {0,};
char tmp[BUFSIZE] = {0,};
char url[1024] = {0,};
char response_header[BUFSIZE] = {0,};
char response_message[BUFSIZE] = {0,};
char response_body[BUFSIZE] = {0,};

char method[20] = {0,};
char *tok = NULL;
memset(response_message,0,BUFSIZE);
len = sizeof(client_addr);
client_fd = accept(socket_fd, (struct sockaddr*)&client_addr, &len); // 소켓 연결
if(client_fd <0){
printf("Server:accept failed\n");
return 0;
}
inet_client_address.s_addr = client_addr.sin_addr.s_addr;
printf("%s %d client was connected\n", inet_ntoa(inet_client_address), client_addr.sin_port);
read(client_fd,buf,BUFSIZE);
strcpy(tmp,buf);
printf("Request from %s %d\n", inet_ntoa(inet_client_address), client_addr.sin_port);
puts(buf);
tok = strtok(tmp," ");
strcpy(method, tok);
if(strcmp(method,"GET") == 0)
{
tok = strtok(NULL, " ");
strcpy(url,tok);
} /// url을 얻는다

int size;
FILE *ftr1 = fopen("a.JPG","rb");
FILE *ftr2 = fopen("b.JPG","w");

fseek(ftr1, 0, SEEK_END); // 파일 포인터를 파일의 끝으로 이동시킴
size = ftell(ftr1); // 파일 포인터의 현재 위치를 얻음
fseek(ftr1, 0, SEEK_SET);

char buf[100000];
int read;
while(1)
{
read = fread((void *)buf,1,size,ftr1);

if(read<100000)
{
if(feof(ftr1) != 0)
{
fwrite((void *)buf,1,read,ftr2);

break;
}
}
fwrite((void *)buf,1,size,ftr2);
remove("b.JPG");
}
// a란파일을 읽고 b라는 파일을 버퍼에 복사, 복사한 뒤 b는 삭제
fclose(ftr1);
fclose(ftr2);
strcpy(response_body); // response_body
write(client_fd,buf,size);

sprintf(response_body,"%s",strsum1);

sprintf(response_header,
"HTTP/1.0 200 OK \r \n"
"Server:2019 simple web server \r \n"
"Content-length:%lu\r\n"
"Content-Type:image/*\r\n\r\n",strlen(response_message));

}

write(client_fd,response_header,strlen(response_header));
write(client_fd,response_body,strlen(response_body));
printf("%s %d client was disconnected\n", inet_ntoa(inet_client_address),client_addr.sin_port);
close(client_fd);

}
close(socket_fd);
return 0;
}