void MainWindow::writeToFile(const QString& fileName)
{
    FILE* file = fopen(fileName.toAscii(), "w+");

    char header[4] = { 'C', 'H', 'B', 'G' };
    fwrite(header, 1, 4, file);

    unsigned short swidth = ui->widthBox->value();
    fwrite(&swidth, 1, 2, file);

    unsigned short sheight = ui->heightBox->value();
    fwrite(&sheight, 1, 2, file);

    unsigned char tileColorBits = 0x08;
    fwrite(&tileColorBits, 1, 1, file);

    BinFile palfile;
    if (!palfile.read(ui->paletteBox->text()))
    {
        QErrorMessage errorMessage;
        errorMessage.showMessage("Failed to open palette file.");
        errorMessage.exec();

        fclose(file);

        return;
    }

    unsigned char numberOfColors = palfile.size / 2;
    unsigned char colorLines = numberOfColors / 16;
    fwrite(&colorLines, 1, 1, file);

    BinFile imgfile;
    if (!imgfile.read(ui->imageBox->text()))
    {
        QErrorMessage errorMessage;
        errorMessage.showMessage("Failed to open image file.");
        errorMessage.exec();

        fclose(file);

        return;
    }

    unsigned short numberOfTiles = imgfile.size / 64;
    fwrite(&numberOfTiles, 1, 2, file);

    int emptyPart = 0;
    fwrite(&emptyPart, 1, 4, file);

    BinFile mapfile;
    if (!mapfile.read(ui->imageBox->text()))
    {
        QErrorMessage errorMessage;
        errorMessage.showMessage("Failed to open map file.");
        errorMessage.exec();

        fclose(file);

        return;
    }

    int written = fwrite(palfile.data, 1, palfile.size, file);
    printf("wrote %d bytes to palette.\n", written);

    written = fwrite(mapfile.data, 1, mapfile.size, file);
    printf("wrote %d bytes to puzzle.\n", written);

    written = fwrite(imgfile.data, 1, imgfile.size, file);
    printf("wrote %d bytes to tiles.\n", written);

    palfile.freeData();
    imgfile.freeData();
    mapfile.freeData();

    fclose(file);
}