#include <iostream.h>
#include <fstream.h>
#include <stdlib.h>

#include "image.h"

void readImage(char fname[], ImageType& image)
{
 int i, j;
 int N, M, Q;
 unsigned char *charImage;
 char header [100], *ptr;
 ifstream ifp;

 ifp.open(fname, ios::in);
  
 if (!ifp) {
   cout << "Can't read image: " << fname << endl;
   exit(1);
 }

 // read header

 ifp.getline(header,100,'\n');

 if ( (header[0]!=80) ||    /* 'P' */
      (header[1]!=54) ) {   /* '6' */
      cout << "Image " << fname << " is not PPM" << endl;
      exit(1);
 }

 ifp.getline(header,100,'\n');
 while(header[0]=='#')
   ifp.getline(header,100,'\n');

 M=strtol(header,&ptr,0);
 N=atoi(ptr);
 
 ifp.getline(header,100,'\n');
 Q=strtol(header,&ptr,0);

 charImage = (unsigned char *) new unsigned char [3*M*N];

 ifp.read( reinterpret_cast<char *>(charImage), (3*M*N)*sizeof(unsigned char));

 if (ifp.fail()) {
   cout << "Image " << fname << " has wrong size" << endl;
   exit(1);
 }

 ifp.close();
 
 /* Convert the unsigned characters to integers */

 RGB val;
 
 for(i=0; i < N; i++)
  for(j=0; j < 3*M; j+=3) {
    val.r = (int)charImage[i*3*M+j];
    val.g = (int)charImage[i*3*M+j+1];
    val.b = (int)charImage[i*3*M+j+2];
    image.setPixelVal(i, j/3, val);
  }

delete [] charImage;

}