int ppmReadFile(
char *fname,
unsigned char **r,
unsigned char **g,
unsigned char **b,
int *ncols,
int *nrows)
{
FILE *fp;
unsigned char *rpt, *gpt, *bpt;
int magic, npixels, maxval, i;
unsigned char *rgb, *rgbpt;
/* Open file */
if ( (fp = fopen(fname, "rb")) == NULL)
KLTError("(ppmWriteFileRGB) Can't open file named '%s' for readingng\n", fname);
ppmReadHeader(fp, &magic, ncols, nrows, &maxval);
npixels = *nrows * *ncols;
if(*r == NULL)
{
if ((*r = (unsigned char *)malloc(npixels*3)) == NULL) {
KLTError("Error allocating %d bytes for PGM file: %s\n", npixels, fname);
}
*g = *r + npixels;
*b = *g + npixels;
}
rgb = (unsigned char *)malloc(npixels*3);
fread(rgb, npixels*3, 1, fp);
rpt = *r;
gpt = *g;
bpt = *b;
rgbpt = rgb;
for(i = 0; i < npixels; ++i)
{
*(rpt++)=*(rgbpt++);
*(gpt++)=*(rgbpt++);
*(bpt++)=*(rgbpt++);
}
free(rgb);
fclose(fp);
return 1;
}
void ppmReadHeaderFile(
char *fname,
int *magic,
int *ncols, int *nrows,
int *maxval)
{
FILE *fp;
/* Open file */
if ( (fp = fopen(fname, "rb")) == NULL)
KLTError("(ppmReadHeaderFile) Can't open file named '%s' for reading\n", fname);
/* Read header */
ppmReadHeader(fp, magic, ncols, nrows, maxval);
/* Close file */
fclose(fp);
}