6181a8992c
* mail-identify.c (mail_identify_mime_part): If the message data is online, sniff the data for a MIME type first, and use the filename second. Makes it more reliable, and deals with the specific case of "application/octet-stream; name=foo.vcf" which gnome-vfs will identify as vcalendar, but which can also be a vcard. svn path=/trunk/; revision=9968
111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
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/*
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* Author :
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* Dan Winship <danw@helixcode.com>
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*
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* Copyright 2000, Helix Code, Inc. (http://www.helixcode.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <libgnomevfs/gnome-vfs-mime.h>
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#include <libgnomevfs/gnome-vfs-mime-sniff-buffer.h>
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#include "mail.h"
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static const char *identify_by_magic (CamelDataWrapper *data, MailDisplay *md);
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/**
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* mail_identify_mime_part:
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* @part: a CamelMimePart
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* @md: the MailDisplay @part is being shown in
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*
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* Try to identify the MIME type of the data in @part (which presumably
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* doesn't have a useful Content-Type).
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**/
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char *
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mail_identify_mime_part (CamelMimePart *part, MailDisplay *md)
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{
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const char *filename, *type;
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CamelDataWrapper *data;
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/* If the MIME part data is online, try file magic first,
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* since it's more reliable.
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*/
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data = camel_medium_get_content_object (CAMEL_MEDIUM (part));
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if (!camel_data_wrapper_is_offline (data)) {
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type = identify_by_magic (data, md);
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if (type)
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return g_strdup (type);
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}
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/* Try identifying based on name in Content-Type or
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* filename in Content-Disposition.
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*/
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filename = camel_mime_part_get_filename (part);
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if (filename) {
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type = gnome_vfs_mime_type_from_name_or_default (filename,
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NULL);
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if (type)
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return g_strdup (type);
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}
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/* Another possibility to try is the x-mac-type / x-mac-creator
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* parameter to Content-Type used by some Mac email clients. That
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* would require a Mac type to mime type conversion table.
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*/
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/* If the data part is offline, then we didn't try magic
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* before, so force it to be loaded so we can try again later.
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* FIXME: In a perfect world, we would not load the content
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* just to identify the MIME type.
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*/
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if (camel_data_wrapper_is_offline (data))
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mail_content_loaded (data, md);
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return NULL;
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}
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static const char *
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identify_by_magic (CamelDataWrapper *data, MailDisplay *md)
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{
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GnomeVFSMimeSniffBuffer *sniffer;
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CamelStream *memstream;
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const char *type;
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GByteArray *ba;
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ba = g_byte_array_new ();
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memstream = camel_stream_mem_new_with_byte_array (ba);
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camel_data_wrapper_write_to_stream (data, memstream);
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if (ba->len) {
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sniffer = gnome_vfs_mime_sniff_buffer_new_from_memory (ba->data, ba->len);
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type = gnome_vfs_get_mime_type_for_buffer (sniffer);
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gnome_vfs_mime_sniff_buffer_free (sniffer);
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} else
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type = NULL;
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camel_object_unref (CAMEL_OBJECT (memstream));
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return type;
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}
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