MicroDVD Subtitles' FPS Converter

/* ---------------------------------------------------------------------------
** This software is in the public domain, furnished "as is", without technical
** support, and with no warranty, express or implied, as to its usefulness for
** any purpose.
**
** MicroDVD Subtitles' FPS Converter.cpp
** This file contains the very whole code. Developed using the Dev-C++ IDE.
**
** Author: jaggi
** Version: 1.0.0.0
** contact: [email protected]
** -------------------------------------------------------------------------*/

#include <iostream>
#include <conio.h>
#include <fstream>
#include <string>
#include <cmath>
#include <cstdlib>
#include <sstream>

using namespace std;

void convert(int& frame, float fps_s, float fps_d)  { frame=ceil(frame*fps_d/fps_s); }
template <typename T> string tostr(const T& t) { ostringstream os; os<<t; return os.str(); }

int count(const char* name)
{
    string temp;
    int x=0;
    ifstream file1(name);
    while(getline(file1, temp)) x++;
    x++;
    file1.close();
    return x;
}

float menu(string msg)
{
    cout<<msg<<"\n1. 12 \n2. 15 \n3. 18\n4. 20\n5. 23.976 \n6. 24 \n7. 25 \n8. 29.97 \n9. 30\n";
    char choice=getch();
    switch(choice)
    {
        case '1':return 12;
        case '2':return 15;
        case '3':return 18;
        case '4':return 20;
        case '5':return 23.976;
        case '6':return 24;
        case '7':return 25;
        case '8':return 29.97;
        case '9':return 30;
        default: return 0;
    }
}

void modify(string& line, float fps_s, float fps_d)
{
    string sf1, sf2, temp="";
    int f1,f2. i=0;
    for(;i<line.length();i++)
    {
        if(line[i]=='{')
        {
            i++;
            while (line[i]!='}')
            {
                  temp+=line[i];
                  i++;
            }
            break;
        }
    }
    f1=atoi(temp.c_str());
    temp="";
    for(;i<line.length();i++)
    {
        if(line[i]=='{')
        {
            i++;
            while (line[i]!='}')
            {
                  temp+=line[i];
                  i++;
            }
            break;
        }
    }
    f2=atoi(temp.c_str());
    convert(f1, fps_s, fps_d);
    convert(f2, fps_s, fps_d);
    sf1=tostr(f1);
    sf2=tostr(f2);
    line="{"+sf1+"}"+"{"+sf2+"}"+line.erase(0, i+1);
}

void file(const char* name, int x)
{
    ifstream file1(name);
    string tmp;
    string* tab=new string[x];
    for (int i=0;i<=x;i++)
        getline(file1, tab[i]);

    float fps_s, fps_d;
    fps_s=menu("Source file FPS");
    fps_d=menu("Destination file FPS");
    for (int i=0;i<x;i++)
        modify(tab[i], fps_s, fps_d);
    tmp=name;
    tmp=tmp.insert(tmp.length()-4, "_");
    tab[0]="{1}{1}";
    tab[0]+=tostr(fps_d);
    ofstream file2(tmp.c_str());
    for (int i=0;i<x;i++)
        file2<<tab[i]<<endl;
    file1.close();
    file2.close();
}

int main(int argc, char** argv)
{
    cout<<"MicroDVD Subtitles' FPS Converter by jaggi.\nNo rights reserved :)\nEnjoy ;)\n";
    cout<<"contact ==> jaggi"<<"@"<<"interia.eu\n\n";
    if(argc==1)
    {
        cout<<"!Note!\nYou may drag your subtitles & drop on the converter's icon \nto skip typing filename.\n\n";
        cout<<"Enter filename (with extension). Be sure it is spelled correctly.\n";
        string name;
        cin>>name;
        int x=count(name.c_str());
        file(name.c_str(), x);
        cout<<"\nDone :)\nOutput file is named "<<name.insert(name.length()-4, "_")<<".\nPress any key to exit.";
        getch();
        return 0;
    }
    int x=count(argv[1]);
    file(argv[1], x);
    string name=argv[1];
    cout<<"\nDone :)\nOutput file is named "<<name.insert(name.length()-4, "_")<<".\nPress any key to exit.";
    getch();
    return 0;
}