1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
3 * Copyright (C) 2000-2012 Jeffrey Stedfast
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public License
7 * as published by the Free Software Foundation; either version 2.1
8 * of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free
17 * Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
22 #ifndef __GMIME_ICONV_H__
23 #define __GMIME_ICONV_H__
30 void g_mime_iconv_init (void);
31 void g_mime_iconv_shutdown (void);
33 iconv_t g_mime_iconv_open (const char *to, const char *from);
38 * @cd: iconv_t conversion descriptor
39 * @inbuf: input buffer
40 * @inleft: number of bytes left in @inbuf
41 * @outbuf: output buffer
42 * @outleft: number of bytes left in @outbuf
44 * The argument @cd must be a conversion descriptor created using the
45 * function #g_mime_iconv_open.
47 * The main case is when @inbuf is not %NULL and *inbuf is not
48 * %NULL. In this case, the #g_mime_iconv function converts the
49 * multibyte sequence starting at *inbuf to a multibyte sequence
50 * starting at *outbuf. At most *inleft bytes, starting at *inbuf,
51 * will be read. At most *outleft bytes, starting at *outbuf, will
54 * The #g_mime_iconv function converts one multibyte character at a
55 * time, and for each character conversion it increments *inbuf and
56 * decrements *inleft by the number of converted input bytes, it
57 * increments *outbuf and decrements *outleft by the number of
58 * converted output bytes, and it updates the conversion state
59 * contained in @cd. The conversion can stop for four reasons:
61 * 1. An invalid multibyte sequence is encountered in the input. In
62 * this case it sets errno to %EILSEQ and returns (size_t)(-1).
63 * *inbuf is left pointing to the beginning of the invalid multibyte
66 * 2. The input byte sequence has been entirely converted, i.e.
67 * *inleft has gone down to %0. In this case #g_mime_iconv returns
68 * the number of non-reversible conversions performed during this
71 * 3. An incomplete multibyte sequence is encountered in the input,
72 * and the input byte sequence terminates after it. In this case it
73 * sets errno to %EINVAL and returns (size_t)(-1). *inbuf is left
74 * pointing to the beginning of the incomplete multibyte sequence.
76 * 4. The output buffer has no more room for the next converted
77 * character. In this case it sets errno to %E2BIG and returns
80 * A different case is when @inbuf is %NULL or *inbuf is %NULL, but
81 * @outbuf is not %NULL and *outbuf is not %NULL. In this case, the
82 * #g_mime_iconv function attempts to set @cd's conversion state to
83 * the initial state and store a corresponding shift sequence at
84 * *outbuf. At most *outleft bytes, starting at *outbuf, will be
85 * written. If the output buffer has no more room for this reset
86 * sequence, it sets errno to %E2BIG and returns (size_t)(-1).
87 * Otherwise it increments *outbuf and decrements *outleft by the
88 * number of bytes written.
90 * A third case is when @inbuf is %NULL or *inbuf is %NULL, and
91 * @outbuf is %NULL or *outbuf is %NULL. In this case, the
92 * #g_mime_iconv function sets @cd's conversion state to the initial
95 * Returns: the number of characters converted in a nonreversible way
96 * during this call; reversible conversions are not counted. In case
97 * of error, it sets errno and returns (size_t)(-1).
99 #define g_mime_iconv(cd,inbuf,inleft,outbuf,outleft) iconv (cd, inbuf, inleft, outbuf, outleft)
101 int g_mime_iconv_close (iconv_t cd);
105 #endif /* __GMIME_ICONV_H__ */