main.cpp

#include <fstream>
#include <iostream>
#include <vector>

/*
Tutoj kod dobyvajet iz .*dat arhivov igry Apocalypse 3000  .*png fajly
*/

const unsigned char png_signature[] = {0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A};

int find_png_signature(const std::vector<unsigned char>& data, int start) {
    for (int i = start; i < data.size() - sizeof(png_signature); ++i) {
        if (memcmp(&data[i], png_signature, sizeof(png_signature)) == 0) {
            return i;
        }
    }
    return -1;
}

int main() {
    std::string dat_file = "intro.dat";
    std::fstream file(dat_file, std::ios::binary | std::ios::in);

    if (!file.is_open()) {
        std::cerr << "Error: Could not open file: " << dat_file << std::endl;
        return 1;
    }

    file.seekg(0, std::ios::end);
    std::streamsize size = file.tellg();
    file.seekg(0, std::ios::beg);
    std::vector<unsigned char> data(size);
    file.read(reinterpret_cast<char*>(data.data()), size);

    int current_position = 0;
    int png_start = find_png_signature(data, current_position);
    int image_count = 0;

    while (png_start != -1) {
        std::vector<unsigned char> png_data(data.begin() + png_start, data.end());

        std::ofstream output_file("extracted_png_" + std::to_string(image_count) + ".png", std::ios::binary);
        if (!output_file.is_open()) {
            std::cerr << "Error: Could not create output file" << std::endl;
        } else {
            output_file.write(reinterpret_cast<char*>(png_data.data()), png_data.size());
            output_file.close();
            std::cout << "Extracted PNG: extracted_png_" << image_count << ".png" << std::endl;
            image_count++;
        }

        current_position = png_start + sizeof(png_signature);
        png_start = find_png_signature(data, current_position);
    }

    file.close();
    return 0;
}