da449e4dac
2001-10-01 Larry Ewing <lewing@ximian.com> * mail-identify.c (mail_identify_mime_part): if gnome-vfs returns application/octet-stream with the magic check, use the filename check instead since it at least has a chance of being useful. svn path=/trunk/; revision=13265
132 lines
4.0 KiB
C
132 lines
4.0 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@ximian.com>
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*
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* Copyright 2000, Ximian, Inc. (www.ximian.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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* Return value: the MIME type, which the caller must free, or %NULL
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* if it could not be identified.
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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, *name_type = NULL, *magic_type = NULL;
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CamelDataWrapper *data;
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filename = camel_mime_part_get_filename (part);
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if (filename) {
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/* GNOME-VFS will misidentify TNEF attachments as MPEG */
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if (!strcmp (filename, "winmail.dat"))
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return g_strdup ("application/vnd.ms-tnef");
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name_type = gnome_vfs_mime_type_from_name_or_default (filename, NULL);
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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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magic_type = identify_by_magic (data, md);
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if (magic_type && name_type) {
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/* If GNOME-VFS doesn't recognize the data by magic, but it
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* contains English words, it will call it text/plain. If the
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* filename-based check came up with something different, use
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* that instead.
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*/
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if (!strcmp (magic_type, "text/plain"))
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return g_strdup (name_type);
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/* If if returns "application/octet-stream" try to
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* do better with the filename check.
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*/
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if (!strcmp (magic_type, "application/octet-stream"))
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return g_strdup (name_type);
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}
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/* If the MIME part data was online, and the magic check
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* returned something, use that, since it's more reliable.
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*/
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if (magic_type)
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return g_strdup (magic_type);
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/* Otherwise try guessing based on the filename */
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if (name_type)
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return g_strdup (name_type);
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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, TRUE, NULL, NULL);
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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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