How to read txt with color palette to apply to another txt with characters?

Question

I need to read the color palette file, something like:

. 0 0 64

x 255 255 0

0 0 0

where each symbol in the first column represents the image in another txt file. Where it has ". x o" need to be replaced by the RGB that exists next door to generate a PPM image.

int image::palheta(string nome, int height, int width){

int i, j;
int dado[i][j];
int red,green,blue;
ifstream iFile(nome); 
string str;
if(iFile)
{
    ostringstream ss;
    ss << iFile.rdbuf();
    str = ss.str();
}
    

for(int j=0; j<height; j++)
{
    for (int i = 0; i < width; ++i)
    {
        if(dado[i][j] == '.'){
            iFile >> red;
            iFile >> green;
            iFile >> blue;
            set(i,j,red,green,blue);
            cout << getred(i,j) << " " << getgreen(i,j) << " " << getblue(i,j) << " ";
        }

        if(dado[i][j] == 'x'){
            iFile >> red;
            iFile >> green;
            iFile >> blue;
            set(i,j,red,green,blue);        
            cout << getred(i,j) << " " << getgreen(i,j) << " " << getblue(i,j) << " ";
        }

        if(dado[i][j] == '0'){
            iFile >> red;
            iFile >> green;
            iFile >> blue;
            set(i,j, red,green,blue);       
            cout << getred(i,j) << " " << getgreen(i,j) << " " << getblue(i,j) << " ";
        }
    }
        
}
   cout<<str;
   iFile.close();  
}

I am developing in C++, I have created a method to read the color palette but I am not able to save only the rgb values. Could someone help me?