#include <stdio.h>
#include <fcntl.h>
#include <termios.h>
#include <unistd.h>
#include <string.h>

void base64Convert(){
    FILE *r,*w;
    unsigned char a,b,c,temp,chek[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    r = fopen("out.txt","rb");
    w = fopen("in.txt","wb");
    temp='!';
    fprintf(w,"%c",temp);
    while(1){
        fscanf(r,"%c",&a);
        if(feof(r))break;
        temp = a>>2;
        temp = chek[temp];
        fprintf(w,"%c",temp);

        fscanf(r,"%c",&b);
        if(feof(r)){
            temp = ((1<<6)-1) & a<<4;
            temp = chek[temp];
            fprintf(w,"%c",temp);
            temp = '=';
            fprintf(w,"%c",temp);
            fprintf(w,"%c",temp);
            break;
        }
        temp = ((1<<6)-1) & (a<<4 | b>>4);
        temp = chek[temp];
        fprintf(w,"%c",temp);

        fscanf(r,"%c",&c);
        if(feof(r)){
            temp = ((1<<6)-1) & b<<2;
            temp = chek[temp];
            fprintf(w,"%c",temp);
            temp = '=';
            fprintf(w,"%c",temp);
            break;
        }
        temp = ((1<<6)-1) & (c>>6 | b<<2);
        temp = chek[temp];
        fprintf(w,"%c",temp);
        temp = ((1<<6)-1) & c;
        temp = chek[temp];
        fprintf(w,"%c",temp);
    }
    temp='#';
    fprintf(w,"%c",temp);
    fclose(r);
    fclose(w);
}

int main(){
    char buffer[256] = "" ;
    base64Convert();
    int port = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY) ;
    if (port == -1){
        perror("open_port: Unable to open /dev/ttyS0 - ");
        return 0;
    }else
        fcntl(port, F_SETFL, 0);

    //Write is here
    FILE *rFile=fopen("in.txt","rb");
    while((buffer[0]=fgetc(rFile))!=EOF) {
        if(buffer[0]==10) buffer[0]='\r';
        //putchar(buffer[0]);
        write(port,buffer,1);
    }
    fclose(rFile) ;
    close(port) ;



    port = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY) ;
    if (port == -1){
        perror("open_port: Unable to open /dev/ttyS0 - ");
        return 0;
    }else
        fcntl(port, F_SETFL, 0);
    write(port,"###",3);
    close(port) ;

    return 0 ;
}