Add libexif to deps/third_party.

libexif/sources/libexif/exif-ifd.c

+/* exif-ifd.c
+ *
+ * Copyright (c) 2002 Lutz Mueller <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 2.1 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 <config.h>
+
+#include <libexif/exif-ifd.h>
+
+#include <stdlib.h>
+
+static const struct {
+        ExifIfd ifd;
+        const char *name;
+} ExifIfdTable[] = {
+        {EXIF_IFD_0, "0"},
+        {EXIF_IFD_1, "1"},
+        {EXIF_IFD_EXIF, "EXIF"},
+        {EXIF_IFD_GPS, "GPS"},
+        {EXIF_IFD_INTEROPERABILITY, "Interoperability"},
+        {0, NULL}
+};
+
+const char *
+exif_ifd_get_name (ExifIfd ifd)
+{
+        unsigned int i;
+
+        for (i = 0; ExifIfdTable[i].name; i++)
+                if (ExifIfdTable[i].ifd == ifd)
+                        break;
+
+        return (ExifIfdTable[i].name);
+}