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/*
* Copyright (C) 2001 Edmund Grimley Evans <edmundo@rano.org>
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdlib.h>
/*
* These functions are like the C library's mbtowc() and wctomb(),
* but instead of depending on the locale they always work in UTF-8,
* and they use int instead of wchar_t.
*/
int utf8_mbtowc(int *pwc, const char *s, size_t n);
int utf8_wctomb(char *s, int wc);
/*
* This is an object-oriented version of mbtowc() and wctomb().
* The caller first uses charset_find() to get a pointer to struct
* charset, then uses the mbtowc() and wctomb() methods on it.
* The function charset_max() gives the maximum length of a
* multibyte character in that encoding.
* This API is only appropriate for stateless encodings like UTF-8
* or ISO-8859-3, but I have no intention of implementing anything
* other than UTF-8 and 8-bit encodings.
*
* MINOR BUG: If there is no memory charset_find() may return 0 and
* there is no way to distinguish this case from an unknown encoding.
*/
struct charset;
struct charset *charset_find(const char *code);
int charset_mbtowc(struct charset *charset, int *pwc, const char *s, size_t n);
int charset_wctomb(struct charset *charset, char *s, int wc);
int charset_max(struct charset *charset);
/*
* Function to convert a buffer from one encoding to another.
* Invalid bytes are replaced by '#', and characters that are
* not available in the target encoding are replaced by '?'.
* Each of TO and TOLEN may be zero if the result is not wanted.
* The input or output may contain null bytes, but the output
* buffer is also null-terminated, so it is all right to
* use charset_convert(fromcode, tocode, s, strlen(s), &t, 0).
*
* Return value:
*
* -2 : memory allocation failed
* -1 : unknown encoding
* 0 : data was converted exactly
* 1 : valid data was converted approximately (using '?')
* 2 : input was invalid (but still converted, using '#')
*/
int charset_convert(const char *fromcode, const char *tocode,
const char *from, size_t fromlen,
char **to, size_t *tolen);
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