Initial revision

1 files changed, 110 insertions, 0 deletions

diff --git a/rd/read-ppm.c b/rd/read-ppm.c
new file mode 100644
index 0000000..b7eb326
--- /dev/null
+++ b/rd/read-ppm.c
@@ -0,0 +1,110 @@
+#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];
+
+    h = malloc(sizeof(*h));
+    memset(h,0,sizeof(*h));
+
+    h->infile = fp;
+    fgets(line,sizeof(line),fp); /* Px */
+    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);
+    fgets(line,sizeof(line),fp); /* ??? */
+    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
+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 void __init init_rd(void)
+{
+    load_register(&ppm_loader);
+    load_register(&pgm_loader);
+}
+