ppm_t* ppm_read(char* filename) {
FILE* ifp;
ppm_t* ppm = malloc(sizeof(ppm_t));
int ich1, ich2;
pixel_format_t pixel_format;
int i, j;
ifp = fopen(filename,"r");
if (ifp == NULL) {
printf("error in opening file %s\n", filename);
exit(1);
}
/* Magic number reading */
ich1 = getc( ifp );
if ( ich1 == EOF )
pm_erreur( "EOF / read error / magic number" );
ich2 = getc( ifp );
if ( ich2 == EOF )
pm_erreur( "EOF /read error / magic number" );
if(ich2 != '3' && ich2 != '6')
pm_erreur(" wrong file type ");
else
if(ich2 == '3')
pixel_format = ALPHA;
else
pixel_format = BINARY;
/* Reading image dimensions */
ppm->cols = pm_getint( ifp );
ppm->rows = pm_getint( ifp );
ppm->maxval = pm_getint( ifp );
/* Memory allocation */
ppm->pixmap = (color*) malloc(ppm->cols * ppm->rows * sizeof(color));
/* Reading */
for(i=0; i < ppm->rows; i++) {
for (j=0; j < ppm->cols ; j++) {
if (pixel_format == BINARY) {
PPM_AT(ppm, i, j).red = pm_getrawbyte(ifp) ;
PPM_AT(ppm, i, j).green = pm_getrawbyte(ifp) ;
PPM_AT(ppm, i, j).blue = pm_getrawbyte(ifp) ;
}
else {
PPM_AT(ppm, i, j).red = pm_getint(ifp);
PPM_AT(ppm, i, j).green = pm_getint(ifp);
PPM_AT(ppm, i, j).blue = pm_getint(ifp);
}
}
}
fclose(ifp);
return ppm;
}
int main(int argc, char* argv[])
{
FILE* ifp;
gray* graymap;
int ich1, ich2, rows, cols, maxval, pgmraw ;
int i, j;
/* Test des arguments */
if ( argc != 2 ){
printf("\nUsage : %s fichier \n\n", argv[0]);
exit(0);
}
/* Ouverture */
ifp = fopen(argv[1],"r");
if (ifp == NULL) {
printf("erreur d'ouverture du fichier %s\n", argv[1]);
exit(1);
}
/* Lecture du Magic number */
ich1 = getc( ifp );
if ( ich1 == EOF )
pm_erreur( "EOF / erreur de lecture / nombre magique" );
ich2 = getc( ifp );
if ( ich2 == EOF )
pm_erreur( "EOF / erreur de lecture / nombre magique" );
if(ich2 != '2' && ich2 != '5')
pm_erreur(" mauvais type de fichier ");
else
if(ich2 == '2')
pgmraw = 0;
else pgmraw = 1;
/* Lecture des dimensions [DONE] */
cols = pm_getint( ifp );
rows = pm_getint( ifp );
/* Allocation memoire */
graymap = (gray *) malloc(cols * rows * sizeof(gray));
/* Lecture [DONE] */
maxval = pm_getint( ifp );
for(i=0; i < rows; i++)
for(j=0; j < cols ; j++)
if (pgmraw)
graymap[i * cols + j] = pm_getrawbyte(ifp);
else
graymap[i * cols + j] = pm_getint(ifp);
/* Ecriture */
if(pgmraw)
printf("P2\n");
else
printf("P5\n");
printf("%d %d \n", cols, rows);
printf("%d\n",maxval);
for(i=0; i < rows; i++)
for(j=0; j < cols ; j++)
if (pgmraw) /* on stocke l'information sous forme ASCII */
printf( "%u ", graymap[i * cols + j] );
else /* on stocke l'information sous forme binaire */
printf( "%c", graymap[i * cols + j] );
/* fermeture */
fclose(ifp);
return 0;
}
