ppm.cpp File Reference

#include <stdio.h>
#include "machine.h"
#include "types.h"
#include "util.h"
#include "imageio.h"
#include "ppm.h"

Include dependency graph for ppm.cpp:

Go to the source code of this file.

Functions
static int	getint (FILE *dfile)
int	readppm (char *name, int *xres, int *yres, unsigned char **imgdata)

---

Function Documentation

static int getint

(

FILE *

dfile

)

[static]

Definition at line 75 of file ppm.cpp.

Referenced by readppm().

                                {
  char ch[200];
  int i;
  int num;

  num=0; 
  while (num==0) {
    fscanf(dfile, "%s", ch);
      while (ch[0]=='#') {
        fgets(ch, 200, dfile);
      }
    num=sscanf(ch, "%d", &i);
  }
  return i;
}

int readppm	(	char *	name,
		int *	xres,
		int *	yres,
		unsigned char **	imgdata
	)

Definition at line 91 of file ppm.cpp.

References getint(), IMAGEBADFILE, IMAGENOERR, IMAGEREADERR, IMAGEUNSUP, and rt_getmem().

Referenced by readimage().

                                                                          {
  char data[200];  
  FILE * ifp;
  int i, bytesread;
  int datasize;
 
  ifp=fopen(name, "r");  
  if (ifp==NULL) {
    return IMAGEBADFILE; /* couldn't open the file */
  }
  fscanf(ifp, "%s", data);
 
  if (strcmp(data, "P6")) {
     fclose(ifp);
     return IMAGEUNSUP; /* not a format we support */
  }

  *xres=getint(ifp);
  *yres=getint(ifp);
      i=getint(ifp); /* eat the maxval number */
  fread(&i, 1, 1, ifp); /* eat the newline */ 
  datasize = 3 * (*xres) * (*yres);

  *imgdata=(unsigned char *)rt_getmem(datasize); 

  bytesread=fread(*imgdata, 1, datasize, ifp);   

  fclose(ifp);

  if (bytesread != datasize) 
    return IMAGEREADERR;
  
  return IMAGENOERR;
}