/* ############################################################################
Name : load_pgm
Description : Read PGM binary file (needs to free the return pointer).Load
the image data in memory.
Arguments Type Description
============== =================== ===========================================
filename(IN) unsigned char * Filename of the image file.
width(OUT) int * Width of the image.
height(OUT) int * Height of the image.
Return Values Description
================================== ===========================================
data The image data.
Globals Type Description
============== =================== ===========================================
Locals Type Description
============== =================== ===========================================
data unsigned char * The image data.
max int The maximum value of the colour components
for the pixels.
w int The width of the image.
h int The height of the image.
c size_t The total number of elements successfully
read from image file.
############################################################################ */
unsigned char *load_pgm(const char *filename, int *width, int *height)
{
unsigned char *data = NULL;
int max, w, h;
size_t c;
FILE *f = fopen(filename, "rb");
if (!f) return NULL;
if (read_pnm_header(f, &w, &h, &max) != 5) {
fclose(f);
return NULL;
}
data = (unsigned char *)malloc(w*h);
if (data == NULL){
printf("Cannot allocate %d bytes for memory.\n", (w*h));
exit(-1);
}
c = fread(data, 1, w*h, f);
if (c != w*h) {
free(data);
data = NULL;
}
*width = w;
*height = h;
return data;
}
static int do_page(deark *c, lctx *d, int pagenum, de_int64 pos1)
{
struct page_ctx *pg = NULL;
int retval = 0;
pg = de_malloc(c, sizeof(struct page_ctx));
pg->fmt = identify_fmt(c, pos1);
d->last_fmt = pg->fmt;
pg->fmt_name = get_fmt_name(pg->fmt);
if(pg->fmt==0) {
de_err(c, "Not PNM/PAM format\n");
goto done;
}
if(pagenum==0) {
de_declare_fmt(c, pg->fmt_name);
}
if(pg->fmt==FMT_PAM) {
if(!read_pam_header(c, d, pg, pos1)) goto done;
}
else {
if(!read_pnm_header(c, d, pg, pos1)) goto done;
}
if(!do_image(c, d, pg, pg->hdr_parse_pos)) {
goto done;
}
d->last_bytesused = (pg->hdr_parse_pos + pg->image_data_len) - pos1;
retval = 1;
done:
de_free(c, pg);
return retval;
}