Add libexif to deps/third_party.

libexif/sources/libexif/exif-format.h

+/*! \file exif-format.h
+ *  \brief Handling native EXIF data types
+ */
+/*
+ *
+ * Copyright (c) 2001 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 __EXIF_FORMAT_H__
+#define __EXIF_FORMAT_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/*! EXIF tag data formats */
+typedef enum {
+        EXIF_FORMAT_BYTE       =  1,
+        EXIF_FORMAT_ASCII      =  2,
+        EXIF_FORMAT_SHORT      =  3,
+        EXIF_FORMAT_LONG       =  4,
+        EXIF_FORMAT_RATIONAL   =  5,
+        EXIF_FORMAT_SBYTE      =  6,
+        EXIF_FORMAT_UNDEFINED  =  7,
+        EXIF_FORMAT_SSHORT     =  8,
+        EXIF_FORMAT_SLONG      =  9,
+        EXIF_FORMAT_SRATIONAL  = 10,
+        EXIF_FORMAT_FLOAT      = 11,
+        EXIF_FORMAT_DOUBLE     = 12
+} ExifFormat;
+
+/*! Return a textual representation of the given EXIF data type.
+ *
+ * \param[in] format EXIF data format
+ * \return localized textual name
+ */
+const char   *exif_format_get_name (ExifFormat format);
+
+/*! Return the raw size of the given EXIF data type.
+ *
+ * \param[in] format EXIF data format
+ * \return size in bytes
+ */
+unsigned char exif_format_get_size (ExifFormat format);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __EXIF_FORMAT_H__ */