Write PGM or PPM images (Portable Graymap and Portable Pixmap)

writepxm.cpp

#include <fstream>
#include <iostream>
#include <string>

void writeppm(char const * const image_buffer,
            int const image_size, 
            int const width, 
            int const height,
            std::string const filename){
    std::ofstream file{filename, std::ios::binary};
    file << "P6\n" << width << '\n' << height << "\n255\n";
    file.write(image_buffer, image_size);
}

void writepgm(char const * const image_buffer,
            int const image_size, 
            int const width, 
            int const height,
            std::string const filename){
    std::ofstream file{filename, std::ios::binary};
    file << "P5\n" << width << '\n' << height << "\n255\n";
    file.write(image_buffer, image_size);
}