/*
 * Geeqie
 * (C) 2006 John Ellis
 *  Copyright (C) 2008 - 2010 The Geeqie Team
 *
 *  Authors:
 *    Support for Exif file format, originally written by Eric Swalens.
 *    Modified by Quy Tonthat
 *    Reimplemented with generic data storage by John Ellis
 *

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#ifndef __EXIF_INT_H
#define __EXIF_INT_H

#include "exif.h"

/*
 *-----------------------------------------------------------------------------
 * Tag formats
 *-----------------------------------------------------------------------------
 */

typedef enum {
	EXIF_BYTE_ORDER_INTEL,
	EXIF_BYTE_ORDER_MOTOROLA
} ExifByteOrder;

typedef struct _ExifFormatAttrib ExifFormatAttrib;
struct _ExifFormatAttrib
{
	ExifFormatType type;
	guint size;
	const gchar *short_name;
	const gchar *description;
};

/* the list of known tag data formats */
extern ExifFormatAttrib ExifFormatList[];


/*
 *-----------------------------------------------------------------------------
 * Data storage
 *-----------------------------------------------------------------------------
 */

typedef struct _ExifMarker ExifMarker;
typedef struct _ExifTextList ExifTextList;

struct _ExifData
{
	gchar *path;
	GList *items;	/* list of (ExifItem *) */
	GList *current; /* for exif_get_next_item */
};


struct _ExifItem
{
	ExifFormatType format;
	guint tag;
	const ExifMarker *marker;
	guint elements;
	gpointer data;
	guint data_len;
};

struct _ExifMarker
{
	guint		tag;
	ExifFormatType	format;
	gint		components;
	gchar		*key;
	gchar		*description;
	ExifTextList	*list;
};

#define EXIF_MARKER_LIST_END { 0x0000, EXIF_FORMAT_UNKNOWN, 0, NULL, NULL, NULL }

struct _ExifTextList
{
	gint value;
	const gchar *description;
};

#define EXIF_TEXT_LIST_END { -1, NULL }




/*
 *-----------------------------------------------------------------------------
 * Data
 *-----------------------------------------------------------------------------
 */



/* the known exif tags list */
extern ExifMarker ExifKnownMarkersList[];

/* the unknown tags utilize this generic list */
extern ExifMarker ExifUnknownMarkersList[];

/* the list of specially formatted keys, for human readable output */
extern ExifFormattedText ExifFormattedList[];


/*
 *-----------------------------------------------------------------------------
 * functions
 *-----------------------------------------------------------------------------
 */


/* usually for debugging to stdout */
void exif_write_data_list(ExifData *exif, FILE *f, gint human_readable_list);



/* These funcs for use by makernote/tiff parsers only */

#define EXIF_TIFF_MAX_LEVELS 4

#define EXIF_TIFD_OFFSET_TAG 0
#define EXIF_TIFD_OFFSET_FORMAT 2
#define EXIF_TIFD_OFFSET_COUNT 4
#define EXIF_TIFD_OFFSET_DATA 8
#define EXIF_TIFD_SIZE 12


guint16 exif_byte_get_int16(guchar *f, ExifByteOrder bo);
guint32 exif_byte_get_int32(guchar *f, ExifByteOrder bo);
void exif_byte_put_int16(guchar *f, guint16 n, ExifByteOrder bo);
void exif_byte_put_int32(guchar *f, guint32 n, ExifByteOrder bo);

ExifItem *exif_item_new(ExifFormatType format, guint tag,
			guint elements, const ExifMarker *marker);
void exif_item_copy_data(ExifItem *item, gpointer src, guint len,
			 ExifFormatType src_format, ExifByteOrder bo);

gint exif_parse_IFD_table(ExifData *exif,
			  guchar *tiff, guint offset,
			  guint size, ExifByteOrder bo,
			  gint level,
			  const ExifMarker *list);

gint exif_tiff_directory_offset(guchar *data, const guint len,
				guint *offset, ExifByteOrder *bo);
gint exif_tiff_parse(ExifData *exif, guchar *tiff, guint size, ExifMarker *list);

gchar *exif_text_list_find_value(ExifTextList *list, guint value);

#endif
/* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */
