Add libexif to deps/third_party.

libexif/sources/test/test-value.c

+/* test-value.c
+ *
+ * Copyright 2002 Lutz M\uffffller <lutz@users.sourceforge.net>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301  USA.
+ */
+
+#include <libexif/exif-utils.h>
+#include <libexif/exif-data.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int
+main ()
+{
+        ExifData *d;
+        ExifEntry *e;
+        char v[1024];
+        ExifSRational r = {1., 20.};
+        unsigned int i;
+
+        d = exif_data_new ();
+        if (!d) {
+                printf ("Error running exif_data_new()\n");
+                exit(13);
+        }
+
+        e = exif_entry_new ();
+        if (!e) {
+                printf ("Error running exif_entry_new()\n");
+                exit(13);
+        }
+
+        exif_content_add_entry (d->ifd[EXIF_IFD_0], e);
+        exif_entry_initialize (e, EXIF_TAG_SHUTTER_SPEED_VALUE);
+        exif_set_srational (e->data, exif_data_get_byte_order (d), r);
+
+        for (i = 30; i > 0; i--) {
+                printf ("Length %2i: '%s'\n", i, 
+                        exif_entry_get_value (e, v, i));
+        }
+
+        exif_entry_unref (e);
+        exif_data_unref (d);
+
+        return 0;
+}