Add libexif to deps/third_party.

libexif/sources/libexif/exif-loader.h

+/*! \file exif-loader.h
+ * \brief Defines the ExifLoader type
+ */
+/*
+ * Copyright (c) 2003 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_LOADER_H__
+#define __EXIF_LOADER_H__
+
+#include <libexif/exif-data.h>
+#include <libexif/exif-log.h>
+#include <libexif/exif-mem.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/*! Data used by the loader interface */
+typedef struct _ExifLoader ExifLoader;
+
+/*! Allocate a new #ExifLoader.
+ *
+ *  \return allocated ExifLoader
+ */
+ExifLoader *exif_loader_new     (void);
+
+/*! Allocate a new #ExifLoader using the specified memory allocator.
+ *
+ *  \param[in] mem the ExifMem
+ *  \return allocated ExifLoader
+ */
+ExifLoader *exif_loader_new_mem (ExifMem *mem);
+
+/*! Increase the refcount of the #ExifLoader.
+ *
+ *  \param[in] loader the ExifLoader to increase the refcount of.
+ */
+void        exif_loader_ref     (ExifLoader *loader);
+
+/*! Decrease the refcount of the #ExifLoader.
+ * If the refcount reaches 0, the loader is freed.
+ *
+ * \param[in] loader ExifLoader for which to decrease the refcount
+ */
+void        exif_loader_unref   (ExifLoader *loader);
+
+/*! Load a file into the given #ExifLoader from the filesystem.
+ * The relevant data is copied in raw form into the #ExifLoader.
+ *
+ * \param[in] loader loader to write to
+ * \param[in] fname path to the file to read
+ */
+void        exif_loader_write_file (ExifLoader *loader, const char *fname);
+
+/*! Load a buffer into the #ExifLoader from a memory buffer.
+ * The relevant data is copied in raw form into the #ExifLoader.
+ *
+ * \param[in] loader loader to write to
+ * \param[in] buf buffer to read from
+ * \param[in] sz size of the buffer
+ * \return 1 while EXIF data is read (or while there is still hope that
+ *   there will be EXIF data later on), 0 otherwise.
+ */
+unsigned char exif_loader_write (ExifLoader *loader, unsigned char *buf, unsigned int sz);
+
+/*! Free any data previously loaded and reset the #ExifLoader to its
+ * newly-initialized state.
+ *
+ * \param[in] loader the loader
+ */
+void          exif_loader_reset (ExifLoader *loader);
+
+/*! Create an #ExifData from the data in the loader. The loader must
+ * already contain data from a previous call to #exif_loader_write_file
+ * or #exif_loader_write.
+ *
+ * \note The #ExifData returned is created using its default options, which
+ * may take effect before the data is returned. If other options are desired,
+ * an #ExifData must be created explicitly and data extracted from the loader
+ * using #exif_loader_get_buf instead.
+ *
+ * \param[in] loader the loader
+ * \return allocated ExifData
+ *
+ * \see exif_loader_get_buf
+ */
+ExifData     *exif_loader_get_data (ExifLoader *loader);
+
+/*! Return the raw data read by the loader.  The returned pointer is only
+ * guaranteed to be valid until the next call to a function modifying
+ * this #ExifLoader.  Either or both of buf and buf_size may be NULL on
+ * entry, in which case that value is not returned.
+ *
+ * \param[in] loader the loader
+ * \param[out] buf read-only pointer to the data read by the loader, or NULL
+ *                 in case of error
+ * \param[out] buf_size size of the data at buf, or 0 in case of error
+ */
+void exif_loader_get_buf (ExifLoader *loader, const unsigned char **buf,
+                                                  unsigned int *buf_size);
+
+/*! Set the log message object used by this #ExifLoader.
+ * \param[in] loader the loader
+ * \param[in] log #ExifLog
+ */
+void exif_loader_log (ExifLoader *loader, ExifLog *log);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __EXIF_LOADER_H__ */