/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*  GMime
 *  Copyright (C) 2000-2022 Jeffrey Stedfast
 *
 *  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 2.1
 *  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, 51 Franklin Street, Fifth Floor, Boston, MA
 *  02110-1301, USA.
 */


#ifndef __GMIME_FILTER_BEST_H__
#define __GMIME_FILTER_BEST_H__

#include <gmime/gmime-encodings.h>
#include <gmime/gmime-filter.h>
#include <gmime/gmime-charset.h>
#include <gmime/gmime-utils.h>

G_BEGIN_DECLS

#define GMIME_TYPE_FILTER_BEST            (g_mime_filter_best_get_type ())
#define GMIME_FILTER_BEST(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GMIME_TYPE_FILTER_BEST, GMimeFilterBest))
#define GMIME_FILTER_BEST_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GMIME_TYPE_FILTER_BEST, GMimeFilterBestClass))
#define GMIME_IS_FILTER_BEST(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GMIME_TYPE_FILTER_BEST))
#define GMIME_IS_FILTER_BEST_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GMIME_TYPE_FILTER_BEST))
#define GMIME_FILTER_BEST_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GMIME_TYPE_FILTER_BEST, GMimeFilterBestClass))

typedef struct _GMimeFilterBest GMimeFilterBest;
typedef struct _GMimeFilterBestClass GMimeFilterBestClass;

/**
 * GMimeFilterBestFlags:
 * @GMIME_FILTER_BEST_CHARSET: Enable best-charset detection.
 * @GMIME_FILTER_BEST_ENCODING: Enable best-encoding detection.
 *
 * Bit flags to enable charset and/or encoding scanning to make
 * educated guesses as to what the best charset and/or encodings to
 * use for the content passed through the filter.
 **/
typedef enum {
	GMIME_FILTER_BEST_CHARSET  = (1 << 0),
	GMIME_FILTER_BEST_ENCODING = (1 << 1)
} GMimeFilterBestFlags;


/**
 * GMimeFilterBest:
 * @parent_object: parent #GMimeFilter
 * @flags: #GMimeFilterBestFlags
 * @charset: #GMimeCharset state
 * @count0: count of nul-bytes passed through the filter
 * @count8: count of 8bit bytes passed through the filter
 * @total: total number of bytes passed through the filter
 * @maxline: the length of the longest line passed through the filter
 * @linelen: current line length
 * @frombuf: buffer for checking From_ lines
 * @fromlen: length of bytes in @frombuf
 * @hadfrom: %TRUE if any line started with "From "
 * @startline: start line state
 * @midline: mid-line state
 *
 * A filter for calculating the best encoding and/or charset to encode
 * the data passed through it.
 **/
struct _GMimeFilterBest {
	GMimeFilter parent_object;
	
	GMimeFilterBestFlags flags;
	
	/* for best charset detection */
	GMimeCharset charset;
	
	/* for best encoding detection */
	unsigned int count0;      /* count of null bytes */
	unsigned int count8;      /* count of 8bit bytes */
	unsigned int total;       /* total octets */
	
	unsigned int maxline;     /* longest line length */
	unsigned int linelen;     /* current line length */
	
	unsigned char frombuf[6];
	unsigned int fromlen : 4;
	unsigned int hadfrom : 1;
	
	unsigned int startline : 1;
	unsigned int midline : 1;
};

struct _GMimeFilterBestClass {
	GMimeFilterClass parent_class;
	
};


GType g_mime_filter_best_get_type (void);

GMimeFilter *g_mime_filter_best_new (GMimeFilterBestFlags flags);

const char *g_mime_filter_best_charset (GMimeFilterBest *best);

GMimeContentEncoding g_mime_filter_best_encoding (GMimeFilterBest *best, GMimeEncodingConstraint constraint);

G_END_DECLS

#endif /* __GMIME_FILTER_BEST_H__ */
