File: gmime-filter-charset.c

package info (click to toggle)
gmime2 2.0.14-2
  • links: PTS
  • area: main
  • in suites: sarge
  • size: 5,092 kB
  • ctags: 3,177
  • sloc: ansic: 29,973; sh: 8,234; makefile: 413; perl: 6
file content (296 lines) | stat: -rw-r--r-- 7,541 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Authors: Jeffrey Stedfast <fejj@ximian.com>
 *
 *  Copyright 2002-2004 Ximian, Inc. (www.ximian.com)
 *
 *  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 Street #330, Boston, MA 02111-1307, USA.
 *
 */


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <errno.h>

#include "gmime-filter-charset.h"
#include "gmime-charset.h"
#include "gmime-iconv.h"


static void g_mime_filter_charset_class_init (GMimeFilterCharsetClass *klass);
static void g_mime_filter_charset_init (GMimeFilterCharset *filter, GMimeFilterCharsetClass *klass);
static void g_mime_filter_charset_finalize (GObject *object);

static GMimeFilter *filter_copy (GMimeFilter *filter);
static void filter_filter (GMimeFilter *filter, char *in, size_t len, size_t prespace,
			   char **out, size_t *outlen, size_t *outprespace);
static void filter_complete (GMimeFilter *filter, char *in, size_t len, size_t prespace,
			     char **out, size_t *outlen, size_t *outprespace);
static void filter_reset (GMimeFilter *filter);


static GMimeFilterClass *parent_class = NULL;


GType
g_mime_filter_charset_get_type (void)
{
	static GType type = 0;
	
	if (!type) {
		static const GTypeInfo info = {
			sizeof (GMimeFilterCharsetClass),
			NULL, /* base_class_init */
			NULL, /* base_class_finalize */
			(GClassInitFunc) g_mime_filter_charset_class_init,
			NULL, /* class_finalize */
			NULL, /* class_data */
			sizeof (GMimeFilterCharset),
			0,    /* n_preallocs */
			(GInstanceInitFunc) g_mime_filter_charset_init,
		};
		
		type = g_type_register_static (GMIME_TYPE_FILTER, "GMimeFilterCharset", &info, 0);
	}
	
	return type;
}


static void
g_mime_filter_charset_class_init (GMimeFilterCharsetClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);
	GMimeFilterClass *filter_class = GMIME_FILTER_CLASS (klass);
	
	parent_class = g_type_class_ref (GMIME_TYPE_FILTER);
	
	object_class->finalize = g_mime_filter_charset_finalize;
	
	filter_class->copy = filter_copy;
	filter_class->filter = filter_filter;
	filter_class->complete = filter_complete;
	filter_class->reset = filter_reset;
}

static void
g_mime_filter_charset_init (GMimeFilterCharset *filter, GMimeFilterCharsetClass *klass)
{
	filter->from_charset = NULL;
	filter->to_charset = NULL;
	filter->cd = (iconv_t) -1;
}

static void
g_mime_filter_charset_finalize (GObject *object)
{
	GMimeFilterCharset *filter = (GMimeFilterCharset *) object;
	
	g_free (filter->from_charset);
	g_free (filter->to_charset);
	if (filter->cd != (iconv_t) -1)
		g_mime_iconv_close (filter->cd);
	
	G_OBJECT_CLASS (parent_class)->finalize (object);
}


static GMimeFilter *
filter_copy (GMimeFilter *filter)
{
	GMimeFilterCharset *charset = (GMimeFilterCharset *) filter;
	
	return g_mime_filter_charset_new (charset->from_charset, charset->to_charset);
}

static void
filter_filter (GMimeFilter *filter, char *in, size_t len, size_t prespace,
	       char **out, size_t *outlen, size_t *outprespace)
{
	GMimeFilterCharset *charset = (GMimeFilterCharset *) filter;
	size_t inleft, outleft, converted = 0;
	char *inbuf;
	char *outbuf;
	
	if (charset->cd == (iconv_t) -1)
		goto noop;
	
	g_mime_filter_set_size (filter, len * 5 + 16, FALSE);
	outbuf = filter->outbuf;
	outleft = filter->outsize;
	
	inbuf = in;
	inleft = len;
	
	do {
		converted = iconv (charset->cd, &inbuf, &inleft, &outbuf, &outleft);
		if (converted == (size_t) -1) {
			if (errno == E2BIG || errno == EINVAL)
				break;
			
			if (errno == EILSEQ) {
				/*
				 * EILSEQ An invalid multibyte sequence has been  encountered
				 *        in the input.
				 *
				 * What we do here is eat the invalid bytes in the sequence and continue
				 */
				
				inbuf++;
				inleft--;
			} else {
				/* unknown error condition */
				goto noop;
			}
		}
	} while (((int) inleft) > 0);
	
	if (((int) inleft) > 0) {
		/* We've either got an E2BIG or EINVAL. Save the
                   remainder of the buffer as we'll process this next
                   time through */
		g_mime_filter_backup (filter, inbuf, inleft);
	}
	
	*out = filter->outbuf;
	*outlen = outbuf - filter->outbuf;
	*outprespace = filter->outpre;
	
	return;
	
 noop:
	
	*out = in;
	*outlen = len;
	*outprespace = prespace;
}

static void 
filter_complete (GMimeFilter *filter, char *in, size_t len, size_t prespace,
		 char **out, size_t *outlen, size_t *outprespace)
{
	GMimeFilterCharset *charset = (GMimeFilterCharset *) filter;
	size_t inleft, outleft, converted = 0;
	char *inbuf;
	char *outbuf;
	
	if (charset->cd == (iconv_t) -1)
		goto noop;
	
	g_mime_filter_set_size (filter, len * 5 + 16, FALSE);
	outbuf = filter->outbuf;
	outleft = filter->outsize;
	
	inbuf = in;
	inleft = len;
	
	if (inleft > 0) {
		do {
			converted = iconv (charset->cd, &inbuf, &inleft, &outbuf, &outleft);
			if (converted != (size_t) -1)
				continue;
			
			if (errno == E2BIG) {
				/*
				 * E2BIG   There is not sufficient room at *outbuf.
				 *
				 * We just need to grow our outbuffer and try again.
				 */
				
				converted = outbuf - filter->outbuf;
				g_mime_filter_set_size (filter, inleft * 5 + filter->outsize + 16, TRUE);
				outbuf = filter->outbuf + converted;
				outleft = filter->outsize - converted;
			} else if (errno == EILSEQ) {
				/*
				 * EILSEQ An invalid multibyte sequence has been  encountered
				 *        in the input.
				 *
				 * What we do here is eat the invalid bytes in the sequence and continue
				 */
				
				inbuf++;
				inleft--;
			} else if (errno == EINVAL) {
				/*
				 * EINVAL  An  incomplete  multibyte sequence has been encoun´┐Ż
				 *         tered in the input.
				 *
				 * We assume that this can only happen if we've run out of
				 * bytes for a multibyte sequence, if not we're in trouble.
				 */
				
				break;
			} else
				goto noop;
			
		} while (((int) inleft) > 0);
	}
	
	/* flush the iconv conversion */
	iconv (charset->cd, NULL, NULL, &outbuf, &outleft);
	
	*out = filter->outbuf;
	*outlen = outbuf - filter->outbuf;
	*outprespace = filter->outpre;
	
	return;
	
 noop:
	
	*out = in;
	*outlen = len;
	*outprespace = prespace;
}

static void
filter_reset (GMimeFilter *filter)
{
	GMimeFilterCharset *charset = (GMimeFilterCharset *) filter;
	
	if (charset->cd != (iconv_t) -1)
		iconv (charset->cd, NULL, NULL, NULL, NULL);
}


/**
 * g_mime_filter_charset_new:
 * @from_charset:
 * @to_charset:
 *
 * Creates a new GMimeFilterCharset filter.
 *
 * Returns a new charset filter.
 **/
GMimeFilter *
g_mime_filter_charset_new (const char *from_charset, const char *to_charset)
{
	GMimeFilterCharset *new;
	iconv_t cd;
	
	cd = g_mime_iconv_open (to_charset, from_charset);
	if (cd == (iconv_t) -1)
		return NULL;
	
	new = g_object_new (GMIME_TYPE_FILTER_CHARSET, NULL, NULL);
	new->from_charset = g_strdup (from_charset);
	new->to_charset = g_strdup (to_charset);
	new->cd = cd;
	
	return (GMimeFilter *) new;
}