#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <iostream>
#include <fstream>

using namespace std;

size_t replace(FILE *fi, FILE *fo, uint8_t *what, uint8_t *repl, size_t size){
    size_t i, index = 0, count = 0;
    int ch;
    while(EOF!=(ch=fgetc(fi))){
        if(ch == what[index]){
            if(++index == size){
                for(i = 0; i < size ; ++i){
                    fputc(repl[i], fo);
                }
                index = 0;
                ++count;
            }
        } else {
            for(i = 0; i < index ; ++i){
                fputc(what[i], fo);
            }
            index =0;
            fputc(ch, fo);
        }
    }
    for(i = 0; i < index ; ++i){
        fputc(what[i], fo);
    }

    return count;
}

int main(void){
    string src[100], dest[100];
    FILE *file,*fileout;

    uint8_t what[] = {0xA8, 0x78, 0x0A, 0x21, 0x6A} ; uint8_t repl[] = {0xE8, 0x78, 0x0A, 0x21, 0x6A};
    size_t count;
    file=fopen("fw","rb");
    fileout=fopen("fw_changed","wb");
    count = replace(file, fileout, what, repl, sizeof(what));
//
//    delete what;
//    delete repl;
//
//    uint8_t what[] = {0xA8, 0x78, 0xB0, 0xFB, 0xF1};     uint8_t repl[] = {0xE8, 0x78, 0xB0, 0xFB, 0xF1};
//    file=fopen("fw","rb");
//    fileout=fopen("fw_changed","wb");
//    count = replace(file, fileout, what, repl, sizeof(what));

    fclose(fileout);
    fclose(file);
    return 0;
}