Add libexif to deps/third_party.

libexif/sources/libexif/olympus/exif-mnote-data-olympus.h

+/* mnote-olympus-data.h
+ *
+ * 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 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.
+ */
+
+#ifndef __MNOTE_OLYMPUS_CONTENT_H__
+#define __MNOTE_OLYMPUS_CONTENT_H__
+
+#include <libexif/exif-mnote-data-priv.h>
+#include <libexif/olympus/mnote-olympus-entry.h>
+#include <libexif/exif-byte-order.h>
+#include <libexif/exif-data.h>
+#include <libexif/exif-mem.h>
+
+enum OlympusVersion {
+        unrecognized = 0,
+        nikonV1 = 1,
+        nikonV2 = 2,
+        olympusV1 = 3,
+        olympusV2 = 4,
+        sanyoV1 = 5,
+        epsonV1 = 6,
+        nikonV0 = 7
+};
+
+
+typedef struct _ExifMnoteDataOlympus ExifMnoteDataOlympus;
+
+struct _ExifMnoteDataOlympus {
+        ExifMnoteData parent;
+
+        MnoteOlympusEntry *entries;
+        unsigned int count;
+
+        ExifByteOrder order;
+        unsigned int offset;
+        enum OlympusVersion version;
+};
+
+/*! Detect if MakerNote is recognized as one handled by the Olympus module.
+ * 
+ * \param[in] ed image #ExifData to identify as as an Olympus type
+ * \param[in] e #ExifEntry for EXIF_TAG_MAKER_NOTE, from within ed but
+ *   duplicated here for convenience
+ * \return 0 if not recognized, nonzero if recognized. The specific nonzero 
+ *   value returned may identify a subtype unique within this module.
+ */
+int exif_mnote_data_olympus_identify (const ExifData *ed, const ExifEntry *e);
+
+ExifMnoteData *exif_mnote_data_olympus_new (ExifMem *);
+
+#endif /* __MNOTE_OLYMPUS_CONTENT_H__ */