Add libexif to deps/third_party.

libexif/sources/libexif/exif-content.h

+/*! \file exif-content.h
+ *  \brief Handling EXIF IFDs
+ */
+/*
+ * 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_CONTENT_H__
+#define __EXIF_CONTENT_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/*! Holds all EXIF tags in a single IFD */
+typedef struct _ExifContent        ExifContent;
+typedef struct _ExifContentPrivate ExifContentPrivate;
+
+#include <libexif/exif-tag.h>
+#include <libexif/exif-entry.h>
+#include <libexif/exif-data.h>
+#include <libexif/exif-log.h>
+#include <libexif/exif-mem.h>
+
+struct _ExifContent
+{
+        ExifEntry **entries;
+        unsigned int count;
+
+        /*! Data containing this content */
+        ExifData *parent;
+
+        ExifContentPrivate *priv;
+};
+
+/* Lifecycle */
+ExifContent *exif_content_new     (void);
+ExifContent *exif_content_new_mem (ExifMem *);
+void         exif_content_ref     (ExifContent *content);
+void         exif_content_unref   (ExifContent *content);
+void         exif_content_free    (ExifContent *content);
+
+/*! Add an EXIF tag to an IFD.
+ * If this tag already exists in the IFD, this function does nothing.
+ * \pre The "tag" member of the entry must be set on entry.
+ *
+ * \param[out] c IFD
+ * \param[in] entry EXIF entry to add
+ */
+void         exif_content_add_entry    (ExifContent *c, ExifEntry *entry);
+
+/*! Remove an EXIF tag from an IFD.
+ * If this tag does not exist in the IFD, this function does nothing.
+ *
+ * \param[out] c IFD
+ * \param[in] e EXIF entry to remove
+ */
+void         exif_content_remove_entry (ExifContent *c, ExifEntry *e);
+
+/*! Return the #ExifEntry in this IFD corresponding to the given tag.
+ * This is a pointer into a member of the #ExifContent array and must NOT be
+ * freed or unrefed by the caller.
+ *
+ * \param[in] content EXIF content for an IFD
+ * \param[in] tag EXIF tag to return
+ * \return #ExifEntry of the tag, or NULL on error
+ */
+ExifEntry   *exif_content_get_entry    (ExifContent *content, ExifTag tag);
+
+/*! Fix the IFD to bring it into specification. Call #exif_entry_fix on
+ * each entry in this IFD to fix existing entries, create any new entries
+ * that are mandatory in this IFD but do not yet exist, and remove any
+ * entries that are not allowed in this IFD.
+ *
+ * \param[in,out] c EXIF content for an IFD
+ */
+void         exif_content_fix          (ExifContent *c);
+
+typedef void (* ExifContentForeachEntryFunc) (ExifEntry *, void *user_data);
+
+/*! Executes function on each EXIF tag in this IFD in turn.
+ * The tags will not necessarily be visited in numerical order.
+ *
+ * \param[in,out] content IFD over which to iterate
+ * \param[in] func function to call for each entry
+ * \param[in] user_data data to pass into func on each call
+ */
+void         exif_content_foreach_entry (ExifContent *content,
+                                         ExifContentForeachEntryFunc func,
+                                         void *user_data);
+
+/*! Return the IFD number in which the given #ExifContent is found.
+ *
+ * \param[in] c an #ExifContent*
+ * \return IFD number, or #EXIF_IFD_COUNT on error
+ */
+ExifIfd exif_content_get_ifd (ExifContent *c);
+
+/*! Return a textual representation of the EXIF data for a tag.
+ *
+ * \param[in] c #ExifContent* for an IFD
+ * \param[in] t #ExifTag to return
+ * \param[out] v char* buffer in which to store value
+ * \param[in] m unsigned int length of the buffer v
+ * \return the v pointer, or NULL on error
+ */
+#define exif_content_get_value(c,t,v,m)                                 \
+        (exif_content_get_entry (c,t) ?                                 \
+         exif_entry_get_value (exif_content_get_entry (c,t),v,m) : NULL)
+
+/*! Dump contents of the IFD to stdout.
+ * This is intended for diagnostic purposes only.
+ *
+ * \param[in] content IFD data
+ * \param[in] indent how many levels deep to indent the data
+ */
+void exif_content_dump  (ExifContent *content, unsigned int indent);
+
+/*! Set the log message object for this IFD.
+ *
+ * \param[in] content IFD
+ * \param[in] log #ExifLog*
+ */
+void exif_content_log   (ExifContent *content, ExifLog *log);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __EXIF_CONTENT_H__ */