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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "readers.h"
/* ---------------------------------------------------------------------- */
/* load */
struct ppm_state {
FILE *infile;
int width,height;
unsigned char *row;
};
static void*
pnm_init(FILE *fp, char *filename, unsigned int page,
struct ida_image_info *i, int thumbnail)
{
struct ppm_state *h;
char line[1024];
char p;
h = malloc(sizeof(*h));
memset(h,0,sizeof(*h));
h->infile = fp;
fgets(line,sizeof(line),fp); /* P[456] */
p = line[1];
fgets(line,sizeof(line),fp); /* width height */
while ('#' == line[0])
fgets(line,sizeof(line),fp); /* skip comments */
sscanf(line,"%d %d",&h->width,&h->height);
if (p != '4')
fgets(line,sizeof(line),fp); /* depth ??? */
if (0 == h->width || 0 == h->height)
goto oops;
i->width = h->width;
i->height = h->height;
i->npages = 1;
h->row = malloc(h->width*3);
return h;
oops:
fclose(fp);
free(h);
return NULL;
}
static void
ppm_read(unsigned char *dst, unsigned int line, void *data)
{
struct ppm_state *h = data;
fread(dst,h->width,3,h->infile);
}
static void
pgm_read(unsigned char *dst, unsigned int line, void *data)
{
struct ppm_state *h = data;
unsigned char *src;
int x;
fread(h->row,h->width,1,h->infile);
src = h->row;
for (x = 0; x < h->width; x++) {
dst[0] = src[0];
dst[1] = src[0];
dst[2] = src[0];
dst += 3;
src += 1;
}
}
static void
pbm_read(unsigned char *dst, unsigned int line, void *data)
{
struct ppm_state *h = data;
int bpl;
bpl = ((h->width+7) >> 3);
fread(h->row,bpl,1,h->infile);
load_bits_msb(dst,(unsigned char*)(h->row),h->width,255,0);
}
static void
pnm_done(void *data)
{
struct ppm_state *h = data;
fclose(h->infile);
free(h->row);
free(h);
}
struct ida_loader ppm_loader = {
magic: "P6",
moff: 0,
mlen: 2,
name: "ppm parser",
init: pnm_init,
read: ppm_read,
done: pnm_done,
};
static struct ida_loader pgm_loader = {
magic: "P5",
moff: 0,
mlen: 2,
name: "pgm parser",
init: pnm_init,
read: pgm_read,
done: pnm_done,
};
static struct ida_loader pbm_loader = {
magic: "P4",
moff: 0,
mlen: 2,
name: "pbm parser",
init: pnm_init,
read: pbm_read,
done: pnm_done,
};
static void __init init_rd(void)
{
load_register(&ppm_loader);
load_register(&pgm_loader);
load_register(&pbm_loader);
}
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