aboutsummaryrefslogtreecommitdiffstats
path: root/camel/camel-mime-filter-charset.c
blob: 537b93c5ff80dc67425270f84a769aa3951d26d8 (plain) (blame)
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
/*
 *  Copyright (C) 2000 Ximian Inc.
 *
 *  Authors: Michael Zucchi <notzed@ximian.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * 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 <iconv.h>

#include <string.h>
#include <errno.h>

#include <gal/util/e-iconv.h>

#include "camel-mime-filter-charset.h"
#include "camel-charset-map.h"

#define d(x)

static void camel_mime_filter_charset_class_init (CamelMimeFilterCharsetClass *klass);
static void camel_mime_filter_charset_init       (CamelMimeFilterCharset *obj);
static void camel_mime_filter_charset_finalize   (CamelObject *o);

static CamelMimeFilterClass *camel_mime_filter_charset_parent;

CamelType
camel_mime_filter_charset_get_type (void)
{
    static CamelType type = CAMEL_INVALID_TYPE;
    
    if (type == CAMEL_INVALID_TYPE) {
        type = camel_type_register (camel_mime_filter_get_type (), "CamelMimeFilterCharset",
                        sizeof (CamelMimeFilterCharset),
                        sizeof (CamelMimeFilterCharsetClass),
                        (CamelObjectClassInitFunc) camel_mime_filter_charset_class_init,
                        NULL,
                        (CamelObjectInitFunc) camel_mime_filter_charset_init,
                        (CamelObjectFinalizeFunc) camel_mime_filter_charset_finalize);
    }
    
    return type;
}

static void
camel_mime_filter_charset_finalize(CamelObject *o)
{
    CamelMimeFilterCharset *f = (CamelMimeFilterCharset *)o;

    g_free(f->from);
    g_free(f->to);
    if (f->ic != (iconv_t)-1) {
        e_iconv_close(f->ic);
        f->ic = (iconv_t) -1;
    }
}

static void
reset(CamelMimeFilter *mf)
{
    CamelMimeFilterCharset *f = (CamelMimeFilterCharset *)mf;
    char buf[16];
    char *buffer;
    int outlen = 16;

    /* what happens with the output bytes if this resets the state? */
    if (f->ic != (iconv_t) -1) {
        buffer = buf;
        e_iconv(f->ic, NULL, 0, &buffer, &outlen);
    }
}

static void
complete(CamelMimeFilter *mf, char *in, size_t len, size_t prespace, char **out, size_t *outlenptr, size_t *outprespace)
{
    CamelMimeFilterCharset *f = (CamelMimeFilterCharset *)mf;
    int converted;
    const char *inbuf;
    char *outbuf;
    int inlen, outlen;

    if (f->ic == (iconv_t) -1) {
        goto donothing;
    }

    /* FIXME: there's probably a safer way to size this ...? */
    /* We could always resize if we run out of room in outbuf (but it'd be nice not
       to have to) */
    camel_mime_filter_set_size(mf, len*5+16, FALSE);
    inbuf = in;
    inlen = len;
    outbuf = mf->outbuf;
    outlen = mf->outsize;

    /* temporary fix to find another bug somewhere */
    d(memset(outbuf, 0, outlen));

    if (inlen>0) {
        converted = e_iconv(f->ic, &inbuf, &inlen, &outbuf, &outlen);
        if (converted == -1) {
            if (errno != EINVAL) {
                g_warning("error occured converting: %s", strerror(errno));
                goto donothing;
            }
        }

        if (inlen>0) {
            g_warning("Output lost in character conversion, invalid sequence encountered?");
        }
    }

    /* this 'resets' the output stream, returning back to the initial
       shift state for multishift charactersets */
    converted = e_iconv(f->ic, NULL, 0, &outbuf, &outlen);
    if (converted == -1) {
        g_warning("Conversion failed to complete: %s", strerror(errno));
    }

    /* debugging assertion - check for NUL's in output */
    d({
        int i;
        
        for (i=0;i<(mf->outsize - outlen);i++) {
            g_assert(mf->outbuf[i]);
        }
    });

    *out = mf->outbuf;
    *outlenptr = mf->outsize - outlen;
    *outprespace = mf->outpre;
    return;

donothing:
    *out = in;
    *outlenptr = len;
    *outprespace = prespace;
}

static void
filter(CamelMimeFilter *mf, char *in, size_t len, size_t prespace, char **out, size_t *outlenptr, size_t *outprespace)
{
    CamelMimeFilterCharset *f = (CamelMimeFilterCharset *)mf;
    int converted;
    const char *inbuf;
    char *outbuf;
    int inlen, outlen;

    if (f->ic == (iconv_t) -1) {
        goto donothing;
    }

    /* FIXME: there's probably a safer way to size this ...? */
    camel_mime_filter_set_size(mf, len*5+16, FALSE);
    inbuf = in;
    inlen = len;
    outbuf = mf->outbuf;
    outlen = mf->outsize;
    converted = e_iconv(f->ic, &inbuf, &inlen, &outbuf, &outlen);
    if (converted == -1) {
        if (errno != EINVAL) {
            g_warning("error occured converting: %s", strerror(errno));
            goto donothing;
        }
    }

    /*
      NOTE: This assumes EINVAL only occurs because we ran out of
      bytes for a multibyte sequence, if not, we're in trouble.
    */

    if (inlen>0) {
        camel_mime_filter_backup(mf, inbuf, inlen);
    }

    *out = mf->outbuf;
    *outlenptr = mf->outsize - outlen;
    *outprespace = mf->outpre;
    return;

donothing:
    *out = in;
    *outlenptr = len;
    *outprespace = prespace;
}

static void
camel_mime_filter_charset_class_init (CamelMimeFilterCharsetClass *klass)
{
    CamelMimeFilterClass *filter_class = (CamelMimeFilterClass *) klass;
    
    camel_mime_filter_charset_parent = CAMEL_MIME_FILTER_CLASS (camel_type_get_global_classfuncs (camel_mime_filter_get_type ()));

    filter_class->reset = reset;
    filter_class->filter = filter;
    filter_class->complete = complete;
}

static void
camel_mime_filter_charset_init (CamelMimeFilterCharset *obj)
{
    obj->ic = (iconv_t)-1;
}

/**
 * camel_mime_filter_charset_new:
 *
 * Create a new CamelMimeFilterCharset object.
 * 
 * Return value: A new CamelMimeFilterCharset widget.
 **/
CamelMimeFilterCharset *
camel_mime_filter_charset_new (void)
{
    CamelMimeFilterCharset *new = CAMEL_MIME_FILTER_CHARSET (camel_object_new (camel_mime_filter_charset_get_type ()));
    return new;
}

CamelMimeFilterCharset *
camel_mime_filter_charset_new_convert (const char *from_charset, const char *to_charset)
{
    CamelMimeFilterCharset *new = CAMEL_MIME_FILTER_CHARSET (camel_object_new (camel_mime_filter_charset_get_type ()));
    
    new->ic = e_iconv_open (to_charset, from_charset);
    if (new->ic == (iconv_t) -1) {
        g_warning("Cannot create charset conversion from %s to %s: %s", from_charset, to_charset, strerror(errno));
        camel_object_unref ((CamelObject *)new);
        new = NULL;
    } else {
        new->from = g_strdup (from_charset);
        new->to = g_strdup (to_charset);
    }
    
    return new;
}