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
|
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* Author :
* Dan Winship <danw@ximian.com>
*
* Copyright 2000, Ximian, Inc. (www.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.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <libgnomevfs/gnome-vfs-utils.h>
#include <libgnomevfs/gnome-vfs-mime.h>
#include <libgnomevfs/gnome-vfs-mime-utils.h>
#include "mail.h"
static const char *identify_by_magic (CamelDataWrapper *data, MailDisplay *md);
/**
* mail_identify_mime_part:
* @part: a CamelMimePart
* @md: the MailDisplay @part is being shown in
*
* Try to identify the MIME type of the data in @part (which presumably
* doesn't have a useful Content-Type).
*
* Return value: the MIME type, which the caller must free, or %NULL
* if it could not be identified.
**/
char *
mail_identify_mime_part (CamelMimePart *part, MailDisplay *md)
{
const char *filename, *name_type = NULL, *magic_type = NULL;
CamelDataWrapper *data;
filename = camel_mime_part_get_filename (part);
if (filename) {
/* GNOME-VFS will misidentify TNEF attachments as MPEG */
if (!strcmp (filename, "winmail.dat"))
return g_strdup ("application/vnd.ms-tnef");
name_type = gnome_vfs_mime_type_from_name (filename);
}
data = camel_medium_get_content_object (CAMEL_MEDIUM (part));
if (!camel_data_wrapper_is_offline (data))
magic_type = identify_by_magic (data, md);
if (magic_type && name_type) {
/* If GNOME-VFS doesn't recognize the data by magic, but it
* contains English words, it will call it text/plain. If the
* filename-based check came up with something different, use
* that instead.
*/
if (!strcmp (magic_type, "text/plain"))
return g_strdup (name_type);
/* If if returns "application/octet-stream" try to
* do better with the filename check.
*/
if (!strcmp (magic_type, "application/octet-stream"))
return g_strdup (name_type);
}
/* If the MIME part data was online, and the magic check
* returned something, use that, since it's more reliable.
*/
if (magic_type)
return g_strdup (magic_type);
/* Otherwise try guessing based on the filename */
if (name_type)
return g_strdup (name_type);
/* Another possibility to try is the x-mac-type / x-mac-creator
* parameter to Content-Type used by some Mac email clients. That
* would require a Mac type to mime type conversion table.
*/
#if 0
/* If the data part is offline, then we didn't try magic
* before, so force it to be loaded so we can try again later.
* FIXME: In a perfect world, we would not load the content
* just to identify the MIME type.
*/
/* This is disabled as it just frustrates users more than it helps,
see discussion in bug #11778 */
if (camel_data_wrapper_is_offline (data))
mail_content_loaded (data, md, TRUE, NULL, NULL, NULL);
#endif
return NULL;
}
static const char *
identify_by_magic (CamelDataWrapper *data, MailDisplay *md)
{
CamelStreamMem *memstream;
const char *type;
memstream = (CamelStreamMem *)camel_stream_mem_new();
if (camel_data_wrapper_write_to_stream (data, (CamelStream *)memstream) > 0)
type = gnome_vfs_get_mime_type_for_data(memstream->buffer->data, memstream->buffer->len);
else
type = NULL;
camel_object_unref(memstream);
return type;
}
|
