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/*
 *  Copyright (C) 2000 Helix Code Inc.
 *
 *  Authors: Michael Zucchi <notzed@helixcode.com>
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library 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 Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef _CAMEL_MIME_FILTER_BESTENC_H
#define _CAMEL_MIME_FILTER_BESTENC_H

#include <camel/camel-mime-filter.h>
#include <camel/camel-mime-part.h>
#include <camel/camel-charset-map.h>

#define CAMEL_MIME_FILTER_BESTENC(obj)         CAMEL_CHECK_CAST (obj, camel_mime_filter_bestenc_get_type (), CamelMimeFilterBestenc)
#define CAMEL_MIME_FILTER_BESTENC_CLASS(klass) CAMEL_CHECK_CLASS_CAST (klass, camel_mime_filter_bestenc_get_type (), CamelMimeFilterBestencClass)
#define IS_CAMEL_MIME_FILTER_BESTENC(obj)      CAMEL_CHECK_TYPE (obj, camel_mime_filter_bestenc_get_type ())

typedef struct _CamelMimeFilterBestencClass CamelMimeFilterBestencClass;

enum _CamelBestencRequired {
    CAMEL_BESTENC_GET_ENCODING = 1<<0,
    CAMEL_BESTENC_GET_CHARSET = 1<<1,

    /* do we treat 'lf' as if it were crlf? */
    CAMEL_BESTENC_LF_IS_CRLF = 1<<8,
    /* do we not allow "From " to appear at the start of a line in any part? */
    CAMEL_BESTENC_NO_FROM = 1<<9,
};
typedef enum _CamelBestencRequired CamelBestencRequired;

enum _CamelBestencEncoding {
    CAMEL_BESTENC_7BIT,
    CAMEL_BESTENC_8BIT,
    CAMEL_BESTENC_BINARY,
};
typedef enum _CamelBestencEncoding CamelBestencEncoding;

struct _CamelMimeFilterBestenc {
    CamelMimeFilter parent;

    unsigned int flags; /* our creation flags, see above */

    unsigned int count0;    /* count of NUL characters */
    unsigned int count8;    /* count of 8 bit characters */
    unsigned int total; /* total characters read */

    unsigned int lastc; /* the last character read */
    int crlfnoorder;    /* if crlf's occured where they shouldn't have */

    int startofline;    /* are we at the start of a new line? */

    int fromcount;
    char fromsave[6];   /* save a few characters if we found an \nF near the end of the buffer */
    int hadfrom;        /* did we encounter a "\nFrom " in the data? */

    unsigned int countline; /* current count of characters on a given line */
    unsigned int maxline;   /* max length of any line */

    CamelCharset charset;   /* used to determine the best charset to use */
};

struct _CamelMimeFilterBestencClass {
    CamelMimeFilterClass parent_class;
};

guint       camel_mime_filter_bestenc_get_type  (void);
CamelMimeFilterBestenc      *camel_mime_filter_bestenc_new  (unsigned int flags);


CamelMimePartEncodingType   camel_mime_filter_bestenc_get_best_encoding(CamelMimeFilterBestenc *f, CamelBestencEncoding required);
const char *        camel_mime_filter_bestenc_get_best_charset(CamelMimeFilterBestenc *f);
void            camel_mime_filter_bestenc_set_flags(CamelMimeFilterBestenc *f, unsigned int flags);

#endif /* ! _CAMEL_MIME_FILTER_BESTENC_H */