#include <stdio.h>
#include <assert.h>
#include <stdlib.h>

typedef struct _rgb {
  unsigned char r,g,b;
} rgb;

typedef 
struct _ppmimage {
  int sizex,sizey;
  rgb *color;
} ppmimage;

ppmimage read_ppmimage ( const char *name )
{
  ppmimage result;
  int range;
  FILE *fp = fopen(name,"rb");
  if (!fp)
    {
      fprintf(stderr,"No file\n");
      exit(1);
    }
  assert(getc(fp)=='P');
  assert(getc(fp)=='6');
  fscanf(fp,"%d%d%d\n",&result.sizex,&result.sizey,&range);
  assert(range==255); // we'll use only rgb range 0...255 here
  result.color = (rgb*)malloc(result.sizex*result.sizey*sizeof(rgb));
  fread(result.color,sizeof(rgb),result.sizex*result.sizey,fp);
  return result;
}