alo

April 05

Prof. Ismael H. F. Santos - ismael@tecgraf.puc-rio.br 46

Leitura em PPM

int ppm_read(int *p_w, int *p_h, unsigned char **p_rgb, char *file_name) {

FILE *fp; char line[80]; int rgb_size; int max;

fp = fopen(file_name, "rb");

if (fp == NULL) { printf(”Error reading %s",file_name); return 0;}

fgets(line,80,fp);

if(strcmp(line,"P6\n")) { printf(”Wrong signature\n"); return 0; }

while (fscanf( fp, " %d ", p_w ) != 1) fgets(line, 80, fp);

while (fscanf( fp, " %d ", p_h ) != 1) fgets(line, 80, fp);

while (fscanf( fp, " %d", &max ) != 1) fgets(line, 80, fp);

fgetc(fp);

rgb_size=3*(*p_w)*(*p_h);

(*p_rgb) = (unsigned char *) calloc(rgb_size, 1);

if ((*p_rgb) != NULL)

fread( (*p_rgb), rgb_size, 1, fp );

fclose(fp);

return 1;

}