gistfile1.c

    // Make the actual 2d array
    map->mask = (bool**) calloc(map->width, sizeof(bool*));
    for (int i=0; i<map->width; i++)
    {
        map->mask[i] = (bool*) calloc(map->height, sizeof(bool));
    }

    // Data is stored in the first 6 bits of every byte, and apparently bottom-right to top-left
    int bitmask = 0x1;
    char* index = end_position - 1;
    int value = ((int) index[0]) - 32;

    // Since it's unlikely that the size of the map is mod 6 == 0, first take out the starting bits from the first byte
    for (int i=0; i<(end_position-start_position)*6 - ((map->width/6)*(map->height/6)); i++)
    {
        bitmask *= 2;
    }

    for (int j=map->height-6; j>=0; j-=6)
    {
        for (int i=map->width-6; i>=0; i-=6)
        {
            if (bitmask == 64)
            {
                // Next/Previous character
                index--;
                value = ((int) index[0]) - 32;
                bitmask = 0x1;
            }
            if (value & bitmask)
            {
                // This part is solid
                for (int k=0; k<6; k++)
                {
                    for (int l=0; l<6; l++)
                    {
                        map->mask[i+k][j+l] = true;
                    }
                }
            }
            bitmask *= 2;
        }
    }