파일전송 만들어봤는데 전송은 되는데 파일 크기가 조금 늘어나네요

#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<fcntl.h>
#include<arpa/inet.h>
#include<sys/types.h>
#include<sys/socket.h>
 
#define PORT 8888
#define BUFSIZE 1024
 
int main(int argc, char **argv)
{
	int serv_sock, clnt_sock,fd,len,str;
	char filesize[128];
	int buf[BUFSIZE];	
	long total;
	struct sockaddr_in server;
	struct sockaddr_in client;
	int client_size;
 
	if(argc !=2 ){
		printf("Usage : %s Filename\n", argv[0]);
		exit(1);
	}
	serv_sock=socket(PF_INET, SOCK_STREAM, 0);
 
	memset(&server, 0, sizeof(server));
	server.sin_family=AF_INET;
	server.sin_addr.s_addr=htonl(INADDR_ANY);
	server.sin_port=htons(PORT);
 
	if(bind(serv_sock,(struct sockaddr*)&server,sizeof(server))==-1)
		printf("bind() error\n");
	if(listen(serv_sock, 5)==-1)
		printf("listen() error\n");
 
	client_size=sizeof(client);
	clnt_sock=accept(serv_sock,(struct sockaddr*)&client,&client_size);
 
	printf("New Client Connected, Client IP : %s \n", inet_ntoa(client.sin_addr));
 
	fd=open(argv[1],O_RDONLY,0);
	total=lseek(fd,0,SEEK_END);
 
	printf("Trans File Size %ld \n",total);
	sprintf(filesize,"%ld",total);
	write(clnt_sock, filesize, 128);
 
	lseek(fd,0,SEEK_SET);
	while((len = read(fd,buf,BUFSIZE)) > 0 ){
		str=send(clnt_sock,buf,BUFSIZE,0);
 
		if(str == BUFSIZE) {
			total-=(long)str;
			if(total <= 0) {
				printf("성공적으로 보내기 완료\n");
				str=0;	
				break;
			}
			else {
				printf("성공 적으로 보내서 %ld 가 남았음\n",total);
				continue;
			}
 
		}
		else if(str < BUFSIZE) {
			total-=(long)str;
			if(total <=0)
			{
				printf("성공 완료\n");
				break;
			}
			printf("비 성공적으로 %d 보냇당 그러나 %ld 만큼 남았다\n",len,total);
		}
		else if(str==-1);
		{
			printf("전송 실패\n");
			exit(0);
		}
	}
	close(clnt_sock);
	close(fd);
	return 0;
}

#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<fcntl.h>
#include<arpa/inet.h>
#include<sys/types.h>
#include<sys/socket.h>
 
#define PORT 8888
#define BUFSIZE 1024
 
int main(int argc, char **argv)
{
	int sock,fd,str,len;
	char filesize[128];
	int buf[BUFSIZE];	
	long total;
	struct sockaddr_in client;
 
	if(argc !=2 ){
		printf("Usage : %s Filename\n", argv[0]);
		exit(1);
	}
	sock=socket(PF_INET, SOCK_STREAM, 0);
 
	memset(&client, 0, sizeof(client));
	client.sin_family=AF_INET;
	client.sin_addr.s_addr=htonl(INADDR_ANY);
	client.sin_port=htons(PORT);
	if(connect(sock,(struct sockaddr*)&serv_addr,sizeof(serv_addr))==-1)
		printf("connect() error\n");
 
	fd=open(argv[1],O_CREAT|O_TRUNC|O_WRONLY,0);
 
	recv(sock, filesize, 128, 0);
	total = atol(filesize);
	printf("전송받을 크기 %ld\n",total);
 
	while((len = recv(sock,buf,BUFSIZE,0)) > 0) {
		str=write(fd,buf,len);
 
		if(str == BUFSIZE) {
			total-=(long)str;
			if(total <= 0) {
				printf("성공적으로 받기 완료\n");
				str=0;
				break;
			}
			else {
				printf("성공 적으로 받아서 %ld 가 남았음\n",total);
				continue;
			}
 
		}
		else if(str < BUFSIZE) {
			total-=(long)str;
			if(total <=0)
			{
				printf("성공 완료\n");
				break;
			}
			printf("비 성공적으로 %d 받았당 그러나 %ld 만큼 남았다\n",len,total);
		}
		else if(str==-1);
		{
			printf("전송 실패\n");
			exit(0);
		}
	}
	close(sock);
	close(fd);
	return 0;
}