File Tamper 2.0

main.cpp

#include <iostream>
#include <fstream>
#include <stdlib.h>
#include <windows.h>

using namespace std;

int main ( int argc, char* argv[] ) {
    if ( argc != 4 ) {
        cout << "Usage: ft <File> <Off> <Data>" << endl;
        return -1;
    }
    fstream file ( argv[1], ios::in | ios::out | ios::binary | ios::ate );
    if ( file.is_open() ) {
        long long fileSize = static_cast<long long> ( file.tellg() );
        cout << "Size: " << fileSize << " bytes" << endl;
        long int yPos = strtol ( argv[2], NULL, 16 );
        long int yData = strtol ( argv[3], NULL, 16 );
        unsigned char sData = static_cast<unsigned char> ( yData );
        if ( yPos < 0 || yPos >= fileSize ) {
            cout << "Overflow. [0 ~ " << fileSize - 1 << "]" << endl;
            return -1;
        }
        std::ios_base::seekdir sPos = static_cast<std::ios_base::seekdir> ( yPos );
        file.seekg ( sPos );
        char oldCbit[8], newCbit[8];
        itoa ( file.get(), oldCbit, 16 );
        itoa ( yData, newCbit, 16 );
        cout << "Data: " << oldCbit << " --> " << newCbit << endl;
        file.seekg ( sPos );
        file << sData;
        file.close();
        while ( file.is_open() )
            Sleep ( 1 );
        cout << "Tampering successfully." << endl;
        return 0;
    } else {
        cout << "Can not open file." << endl;
        return -1;
    }
}

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