static gboolean
nntp_folder_refresh_info_sync (CamelFolder *folder,
                               GCancellable *cancellable,
                               GError **error)
{
	CamelStore *parent_store;
	CamelNNTPStore *nntp_store;
	CamelFolderChangeInfo *changes = NULL;
	CamelNNTPFolder *nntp_folder;
	gchar *line;
	gboolean success;

	parent_store = camel_folder_get_parent_store (folder);

	nntp_folder = CAMEL_NNTP_FOLDER (folder);
	nntp_store = CAMEL_NNTP_STORE (parent_store);

	/* When invoked with no fmt, camel_nntp_command() just selects the folder
	 * and should return zero. */
	success = !camel_nntp_command (
		nntp_store, cancellable, error, nntp_folder, &line, NULL);

	if (camel_folder_change_info_changed (nntp_folder->changes)) {
		changes = nntp_folder->changes;
		nntp_folder->changes = camel_folder_change_info_new ();
	}

	if (changes) {
		camel_folder_changed (folder, changes);
		camel_folder_change_info_free (changes);
	}

	return success;
}
gboolean
camel_nntp_folder_selected (CamelNNTPFolder *nntp_folder,
                            gchar *line,
                            GCancellable *cancellable,
                            GError **error)
{
	CamelFolder *folder;
	CamelStore *parent_store;
	gboolean res;

	folder = CAMEL_FOLDER (nntp_folder);
	parent_store = camel_folder_get_parent_store (folder);

	res = camel_nntp_summary_check (
		CAMEL_NNTP_SUMMARY (folder->summary),
		CAMEL_NNTP_STORE (parent_store),
		line, nntp_folder->changes,
		cancellable, error);

	if (camel_folder_change_info_changed (nntp_folder->changes)) {
		CamelFolderChangeInfo *changes;

		changes = nntp_folder->changes;
		nntp_folder->changes = camel_folder_change_info_new ();

		camel_folder_changed (CAMEL_FOLDER (nntp_folder), changes);
		camel_folder_change_info_free (changes);
	}

	return res;
}
static CamelMimeMessage *
maildir_folder_get_message_sync (CamelFolder *folder,
                                 const gchar *uid,
                                 GCancellable *cancellable,
                                 GError **error)
{
	CamelLocalFolder *lf = (CamelLocalFolder *)folder;
	CamelStream *message_stream = NULL;
	CamelMimeMessage *message = NULL;
	gchar *name = NULL;

	d(printf("getting message: %s\n", uid));

	if (camel_local_folder_lock (lf, CAMEL_LOCK_WRITE, error) == -1)
		return NULL;

	name = maildir_folder_get_filename (folder, uid, error);
	if (!name)
		goto fail;

	message_stream = camel_stream_fs_new_with_name (
		name, O_RDONLY, 0, error);
	if (message_stream == NULL) {
		g_prefix_error (
			error, _("Cannot get message %s from folder %s: "),
			uid, lf->folder_path);
		goto fail;
	}

	message = camel_mime_message_new ();
	if (!camel_data_wrapper_construct_from_stream_sync (
		(CamelDataWrapper *)message,
		message_stream, cancellable, error)) {
		g_prefix_error (
			error, _("Cannot get message %s from folder %s: "),
			uid, lf->folder_path);
		g_object_unref (message);
		message = NULL;

	}
	g_object_unref (message_stream);
 fail:
	g_free (name);

	camel_local_folder_unlock (lf);

	if (lf && camel_folder_change_info_changed (lf->changes)) {
		camel_folder_changed (folder, lf->changes);
		camel_folder_change_info_clear (lf->changes);
	}

	return message;
}
static gboolean
nntp_folder_expunge_sync (CamelFolder *folder,
                          GCancellable *cancellable,
                          GError **error)
{
	CamelFolderSummary *summary;
	CamelFolderChangeInfo *changes;
	GPtrArray *known_uids;
	guint ii;

	summary = folder->summary;

	camel_folder_summary_prepare_fetch_all (summary, NULL);
	known_uids = camel_folder_summary_get_array (summary);

	if (known_uids == NULL)
		return TRUE;

	changes = camel_folder_change_info_new ();

	for (ii = 0; ii < known_uids->len; ii++) {
		CamelMessageInfo *info;
		const gchar *uid;

		uid = g_ptr_array_index (known_uids, ii);
		info = camel_folder_summary_get (summary, uid);

		if (camel_message_info_flags (info) & CAMEL_MESSAGE_DELETED) {
			camel_folder_change_info_remove_uid (changes, uid);
			camel_folder_summary_remove (summary, info);
		}

		camel_message_info_unref (info);
	}

	camel_folder_summary_save_to_db (summary, NULL);
	camel_folder_changed (folder, changes);

	camel_folder_change_info_free (changes);
	camel_folder_summary_free_array (known_uids);

	return TRUE;
}
static gboolean
vee_info_set_flags (CamelMessageInfo *mi,
                    guint32 flags,
                    guint32 set)
{
	gint res = FALSE;
	CamelVeeFolder *vf = (CamelVeeFolder *)mi->summary->folder;
	gboolean hacked_unread_folder = FALSE;

	if (camel_debug("vfolderexp"))
		printf (
			"Expression for vfolder '%s' is '%s'\n",
			camel_folder_get_full_name (mi->summary->folder),
			g_strescape (vf->expression, ""));

	if (camel_vee_folder_get_unread_vfolder (vf) == -1)
		camel_vee_summary_load_check_unread_vfolder (CAMEL_VEE_SUMMARY (mi->summary));

	if (camel_vee_folder_get_unread_vfolder (vf) == 1)
		hacked_unread_folder = TRUE;

	if (mi->uid) {
		guint32 old_visible, visible, old_unread;
		CamelMessageInfo *rmi = camel_folder_summary_uid (((CamelVeeMessageInfo *)mi)->summary, mi->uid+8);
		CamelVeeSummary *vsummary = (CamelVeeSummary *)mi->summary;

		HANDLE_NULL_INFO (FALSE);

		old_visible = rmi->summary->visible_count;
		old_unread = mi->summary->unread_count;
		camel_folder_summary_update_counts_by_flags (mi->summary, camel_message_info_flags (rmi), TRUE);

		if (hacked_unread_folder)
			camel_vee_folder_mask_event_folder_changed ((CamelVeeFolder *)mi->summary->folder, rmi->summary->folder);

		camel_folder_freeze (rmi->summary->folder);
		res = camel_message_info_set_flags (rmi, flags, set);
		((CamelVeeMessageInfo *) mi)->old_flags = camel_message_info_flags (rmi);
		camel_folder_thaw (rmi->summary->folder);

		if (hacked_unread_folder)
			camel_vee_folder_unmask_event_folder_changed ((CamelVeeFolder *)mi->summary->folder, rmi->summary->folder);

		visible = rmi->summary->visible_count;

		/* Keep the summary in sync */
		camel_folder_summary_update_counts_by_flags (mi->summary, camel_message_info_flags (rmi), FALSE);

		if (hacked_unread_folder && !vsummary->fake_visible_count)
			vsummary->fake_visible_count = mi->summary->visible_count;

		if (vsummary->fake_visible_count || hacked_unread_folder)
			vsummary->fake_visible_count += visible - old_visible;

		d(printf("VF %d %d %d %d %d\n", mi->summary->unread_count, mi->summary->deleted_count, mi->summary->junk_count, mi->summary->junk_not_deleted_count, mi->summary->visible_count));

		/* This is where the ugly-created-hack is used */
		if (hacked_unread_folder && mi->summary->unread_count - old_unread != 0) {
			CamelFolderChangeInfo *changes = camel_folder_change_info_new ();
			GPtrArray *match, *array;

			camel_folder_change_info_change_uid (changes, mi->uid);

			array = g_ptr_array_new ();
			g_ptr_array_add (array, (gpointer)rmi->uid);

			match = camel_folder_search_by_uids (rmi->summary->folder, vf->expression, array, NULL);
			if ((match && !match->len) || !match) {
				vsummary->fake_visible_count--;
			} else {
				vsummary->fake_visible_count++;
			}

			g_ptr_array_free (array, TRUE);
			if (match)
				camel_folder_search_free (rmi->summary->folder, match);

			camel_folder_changed (mi->summary->folder, changes);
			camel_folder_change_info_free (changes);
		}
		camel_message_info_free (rmi);
	}

	return res;
}
static gboolean
maildir_folder_append_message_sync (CamelFolder *folder,
                                    CamelMimeMessage *message,
                                    CamelMessageInfo *info,
                                    gchar **appended_uid,
                                    GCancellable *cancellable,
                                    GError **error)
{
	CamelLocalFolder *lf = (CamelLocalFolder *)folder;
	CamelStream *output_stream;
	CamelMessageInfo *mi;
	CamelMaildirMessageInfo *mdi;
	gchar *name, *dest = NULL;
	gboolean success = TRUE;

	d(printf("Appending message\n"));

	/* If we can't lock, don't do anything */
	if (camel_local_folder_lock (lf, CAMEL_LOCK_WRITE, error) == -1)
		return FALSE;

	/* add it to the summary/assign the uid, etc */
	mi = camel_local_summary_add (
		CAMEL_LOCAL_SUMMARY (folder->summary),
		message, info, lf->changes, error);
	if (mi == NULL)
		goto check_changed;

	if ((camel_message_info_flags (mi) & CAMEL_MESSAGE_ATTACHMENTS) && !camel_mime_message_has_attachment (message))
		camel_message_info_set_flags (mi, CAMEL_MESSAGE_ATTACHMENTS, 0);

	mdi = (CamelMaildirMessageInfo *)mi;

	d(printf("Appending message: uid is %s filename is %s\n", camel_message_info_uid(mi), mdi->filename));

	/* write it out to tmp, use the uid we got from the summary */
	name = g_strdup_printf ("%s/tmp/%s", lf->folder_path, camel_message_info_uid(mi));
	output_stream = camel_stream_fs_new_with_name (
		name, O_WRONLY|O_CREAT, 0600, error);
	if (output_stream == NULL)
		goto fail_write;

	if (camel_data_wrapper_write_to_stream_sync (
		(CamelDataWrapper *)message, output_stream, cancellable, error) == -1
	    || camel_stream_close (output_stream, cancellable, error) == -1)
		goto fail_write;

	/* now move from tmp to cur (bypass new, does it matter?) */
	dest = g_strdup_printf("%s/cur/%s", lf->folder_path, camel_maildir_info_filename (mdi));
	if (g_rename (name, dest) == -1) {
		g_set_error (
			error, G_IO_ERROR,
			g_io_error_from_errno (errno),
			"%s", g_strerror (errno));
		goto fail_write;
	}

	g_free (dest);
	g_free (name);

	if (appended_uid)
		*appended_uid = g_strdup(camel_message_info_uid(mi));

	if (output_stream)
		g_object_unref (output_stream);

	goto check_changed;

 fail_write:

	/* remove the summary info so we are not out-of-sync with the mh folder */
	camel_folder_summary_remove_uid (CAMEL_FOLDER_SUMMARY (folder->summary),
					 camel_message_info_uid (mi));

	g_prefix_error (
		error, _("Cannot append message to maildir folder: %s: "),
		name);

	if (output_stream) {
		g_object_unref (CAMEL_OBJECT (output_stream));
		unlink (name);
	}

	g_free (name);
	g_free (dest);

	success = FALSE;

 check_changed:
	camel_local_folder_unlock (lf);

	if (lf && camel_folder_change_info_changed (lf->changes)) {
		camel_folder_changed (folder, lf->changes);
		camel_folder_change_info_clear (lf->changes);
	}

	return success;
}
static gboolean
maildir_folder_transfer_messages_to_sync (CamelFolder *source,
                                          GPtrArray *uids,
                                          CamelFolder *dest,
                                          gboolean delete_originals,
                                          GPtrArray **transferred_uids,
                                          GCancellable *cancellable,
                                          GError **error)
{
	gboolean fallback = FALSE;

	if (delete_originals && CAMEL_IS_MAILDIR_FOLDER (source) && CAMEL_IS_MAILDIR_FOLDER (dest)
	    && camel_folder_get_parent_store (source) == camel_folder_get_parent_store (dest)) {
		gint i;
		CamelLocalFolder *lf = (CamelLocalFolder *) source;
		CamelLocalFolder *df = (CamelLocalFolder *) dest;

		camel_operation_push_message (
			cancellable, _("Moving messages"));

		camel_folder_freeze (dest);
		camel_folder_freeze (source);

		for (i = 0; i < uids->len; i++) {
			gchar *uid = (gchar *) uids->pdata[i];
			gchar *s_filename, *d_filename, *new_filename;
			CamelMaildirMessageInfo *mdi;
			CamelMessageInfo *info;

			if ((info = camel_folder_summary_get (source->summary, uid)) == NULL) {
				set_cannot_get_message_ex (
					error, CAMEL_FOLDER_ERROR_INVALID_UID,
					uid, lf->folder_path, _("No such message"));
				return FALSE;
			}

			mdi = (CamelMaildirMessageInfo *) info;
			new_filename = camel_maildir_summary_info_to_name (mdi);

			d_filename = g_strdup_printf ("%s/cur/%s", df->folder_path, new_filename);
			s_filename = g_strdup_printf ("%s/cur/%s", lf->folder_path, camel_maildir_info_filename (mdi));

			if (g_rename (s_filename, d_filename) != 0) {
				if (errno == EXDEV) {
					i = uids->len + 1;
					fallback = TRUE;
				} else {
					g_set_error (
						error, G_IO_ERROR,
						g_io_error_from_errno (errno),
						_("Cannot transfer message to destination folder: %s"),
						g_strerror (errno));
					camel_message_info_unref (info);
					g_free (s_filename);
					g_free (d_filename);
					g_free (new_filename);
					break;
				}
			} else {
				CamelMessageInfo *clone;
				CamelMaildirMessageInfo *mclone;

				clone = camel_message_info_clone (info);
				clone->summary = dest->summary;

				mclone = (CamelMaildirMessageInfo *) clone;
				/* preserve also UID, as it matches the file name */
				mclone->info.info.uid = camel_pstring_strdup (camel_message_info_get_uid (info));
				camel_maildir_info_set_filename (clone, g_strdup (new_filename));
				/* unset deleted flag when transferring from trash folder */
				if ((source->folder_flags & CAMEL_FOLDER_IS_TRASH) != 0)
					camel_message_info_set_flags (info, CAMEL_MESSAGE_DELETED, 0);
				/* unset junk flag when transferring from junk folder */
				if ((source->folder_flags & CAMEL_FOLDER_IS_JUNK) != 0)
					camel_message_info_set_flags (info, CAMEL_MESSAGE_JUNK, 0);
				camel_folder_summary_add (dest->summary, clone);

				camel_folder_change_info_add_uid (df->changes, camel_message_info_get_uid (clone));

				camel_folder_set_message_flags (
					source, uid, CAMEL_MESSAGE_DELETED |
					CAMEL_MESSAGE_SEEN, ~0);
				camel_folder_change_info_remove_uid (lf->changes, camel_message_info_get_uid (info));
				camel_folder_summary_remove (source->summary, info);
			}

			camel_message_info_unref (info);
			g_free (s_filename);
			g_free (d_filename);
			g_free (new_filename);
		}

		if (lf && camel_folder_change_info_changed (lf->changes)) {
			camel_folder_changed (source, lf->changes);
			camel_folder_change_info_clear (lf->changes);
		}

		if (df && camel_folder_change_info_changed (df->changes)) {
			camel_folder_changed (dest, df->changes);
			camel_folder_change_info_clear (df->changes);
		}

		camel_folder_thaw (source);
		camel_folder_thaw (dest);

		camel_operation_pop_message (cancellable);
	} else
		fallback = TRUE;

	if (fallback) {
		CamelFolderClass *folder_class;

		/* Chain up to parent's transfer_messages_to() method. */
		folder_class = CAMEL_FOLDER_CLASS (camel_maildir_folder_parent_class);
		return folder_class->transfer_messages_to_sync (
			source, uids, dest, delete_originals,
			transferred_uids, cancellable, error);
	}

	return TRUE;
}
static CamelMimeMessage *
mbox_folder_get_message_sync (CamelFolder *folder,
                              const gchar *uid,
                              GCancellable *cancellable,
                              GError **error)
{
	CamelLocalFolder *lf = (CamelLocalFolder *) folder;
	CamelMimeMessage *message = NULL;
	CamelMboxMessageInfo *info;
	CamelMimeParser *parser = NULL;
	gint fd, retval;
	gint retried = FALSE;
	goffset frompos;

	d (printf ("Getting message %s\n", uid));

	/* lock the folder first, burn if we can't, need write lock for summary check */
	if (camel_local_folder_lock (lf, CAMEL_LOCK_WRITE, error) == -1)
		return NULL;

	/* check for new messages always */
	if (camel_local_summary_check ((CamelLocalSummary *) folder->summary, lf->changes, cancellable, error) == -1) {
		camel_local_folder_unlock (lf);
		return NULL;
	}

retry:
	/* get the message summary info */
	info = (CamelMboxMessageInfo *) camel_folder_summary_get (folder->summary, uid);

	if (info == NULL) {
		set_cannot_get_message_ex (
			error, CAMEL_FOLDER_ERROR_INVALID_UID,
			uid, lf->folder_path, _("No such message"));
		goto fail;
	}

	if (info->frompos == -1) {
		camel_message_info_unref (info);
		goto fail;
	}

	frompos = info->frompos;
	camel_message_info_unref (info);

	/* we use an fd instead of a normal stream here - the reason is subtle, camel_mime_part will cache
	 * the whole message in memory if the stream is non-seekable (which it is when built from a parser
	 * with no stream).  This means we dont have to lock the mbox for the life of the message, but only
	 * while it is being created. */

	fd = g_open (lf->folder_path, O_LARGEFILE | O_RDONLY | O_BINARY, 0);
	if (fd == -1) {
		set_cannot_get_message_ex (
			error, CAMEL_ERROR_GENERIC,
			uid, lf->folder_path, g_strerror (errno));
		goto fail;
	}

	/* we use a parser to verify the message is correct, and in the correct position */
	parser = camel_mime_parser_new ();
	camel_mime_parser_init_with_fd (parser, fd);
	camel_mime_parser_scan_from (parser, TRUE);

	camel_mime_parser_seek (parser, frompos, SEEK_SET);
	if (camel_mime_parser_step (parser, NULL, NULL) != CAMEL_MIME_PARSER_STATE_FROM
	    || camel_mime_parser_tell_start_from (parser) != frompos) {

		g_warning ("Summary doesn't match the folder contents!  eek!\n"
			"  expecting offset %ld got %ld, state = %d", (glong) frompos,
			(glong) camel_mime_parser_tell_start_from (parser),
			camel_mime_parser_state (parser));

		g_object_unref (parser);
		parser = NULL;

		if (!retried) {
			retried = TRUE;
			camel_local_summary_check_force ((CamelLocalSummary *) folder->summary);
			retval = camel_local_summary_check ((CamelLocalSummary *) folder->summary, lf->changes, cancellable, error);
			if (retval != -1)
				goto retry;
		}

		set_cannot_get_message_ex (
			error, CAMEL_FOLDER_ERROR_INVALID,
			uid, lf->folder_path,
			_("The folder appears to be irrecoverably corrupted."));
		goto fail;
	}

	message = camel_mime_message_new ();
	if (!camel_mime_part_construct_from_parser_sync (
		(CamelMimePart *) message, parser, cancellable, error)) {
		g_prefix_error (
			error, _("Cannot get message %s from folder %s: "),
			uid, lf->folder_path);
		g_object_unref (message);
		message = NULL;
		goto fail;
	}

	camel_medium_remove_header ((CamelMedium *) message, "X-Evolution");

fail:
	/* and unlock now we're finished with it */
	camel_local_folder_unlock (lf);

	if (parser)
		g_object_unref (parser);

	/* use the opportunity to notify of changes (particularly if we had a rebuild) */
	if (camel_folder_change_info_changed (lf->changes)) {
		camel_folder_changed (folder, lf->changes);
		camel_folder_change_info_clear (lf->changes);
	}

	return message;
}
static gboolean
mbox_folder_append_message_sync (CamelFolder *folder,
                                 CamelMimeMessage *message,
                                 CamelMessageInfo *info,
                                 gchar **appended_uid,
                                 GCancellable *cancellable,
                                 GError **error)
{
	CamelLocalFolder *lf = (CamelLocalFolder *) folder;
	CamelStream *output_stream = NULL, *filter_stream = NULL;
	CamelMimeFilter *filter_from;
	CamelMboxSummary *mbs = (CamelMboxSummary *) folder->summary;
	CamelMessageInfo *mi;
	gchar *fromline = NULL;
	struct stat st;
	gint retval;
	gboolean has_attachment;
#if 0
	gchar *xev;
#endif
	/* If we can't lock, dont do anything */
	if (camel_local_folder_lock (lf, CAMEL_LOCK_WRITE, error) == -1)
		return FALSE;

	d (printf ("Appending message\n"));

	/* first, check the summary is correct (updates folder_size too) */
	retval = camel_local_summary_check ((CamelLocalSummary *) folder->summary, lf->changes, cancellable, error);
	if (retval == -1)
		goto fail;

	/* add it to the summary/assign the uid, etc */
	mi = camel_local_summary_add ((CamelLocalSummary *) folder->summary, message, info, lf->changes, error);
	if (mi == NULL)
		goto fail;

	d (printf ("Appending message: uid is %s\n", camel_message_info_get_uid (mi)));

	has_attachment = camel_mime_message_has_attachment (message);
	if (((camel_message_info_get_flags (mi) & CAMEL_MESSAGE_ATTACHMENTS) && !has_attachment) ||
	    ((camel_message_info_get_flags (mi) & CAMEL_MESSAGE_ATTACHMENTS) == 0 && has_attachment)) {
		camel_message_info_set_flags (mi, CAMEL_MESSAGE_ATTACHMENTS, has_attachment ? CAMEL_MESSAGE_ATTACHMENTS : 0);
	}

	output_stream = camel_stream_fs_new_with_name (
		lf->folder_path, O_WRONLY | O_APPEND |
		O_LARGEFILE, 0666, error);
	if (output_stream == NULL) {
		g_prefix_error (
			error, _("Cannot open mailbox: %s: "),
			lf->folder_path);
		goto fail;
	}

	/* and we need to set the frompos/XEV explicitly */
	((CamelMboxMessageInfo *) mi)->frompos = mbs->folder_size;
#if 0
	xev = camel_local_summary_encode_x_evolution ((CamelLocalSummary *) folder->summary, mi);
	if (xev) {
		/* the x-ev header should match the 'current' flags, no problem, so store as much */
		camel_medium_set_header ((CamelMedium *) message, "X-Evolution", xev);
		mi->flags &= ~ CAMEL_MESSAGE_FOLDER_NOXEV | CAMEL_MESSAGE_FOLDER_FLAGGED;
		g_free (xev);
	}
#endif

	/* we must write this to the non-filtered stream ... */
	fromline = camel_mime_message_build_mbox_from (message);
	if (camel_stream_write (output_stream, fromline, strlen (fromline), cancellable, error) == -1)
		goto fail_write;

	/* and write the content to the filtering stream, that translates '\nFrom' into '\n>From' */
	filter_stream = camel_stream_filter_new (output_stream);
	filter_from = camel_mime_filter_from_new ();
	camel_stream_filter_add ((CamelStreamFilter *) filter_stream, filter_from);
	g_object_unref (filter_from);

	if (camel_data_wrapper_write_to_stream_sync (
		(CamelDataWrapper *) message, filter_stream, cancellable, error) == -1 ||
	    camel_stream_write (filter_stream, "\n", 1, cancellable, error) == -1 ||
	    camel_stream_flush (filter_stream, cancellable, error) == -1)
		goto fail_write;

	/* filter stream ref's the output stream itself, so we need to unref it too */
	g_object_unref (filter_stream);
	g_object_unref (output_stream);
	g_free (fromline);

	if (!((CamelMessageInfoBase *) mi)->preview && camel_folder_summary_get_need_preview (folder->summary)) {
		if (camel_mime_message_build_preview ((CamelMimePart *) message, mi) && ((CamelMessageInfoBase *) mi)->preview)
			camel_folder_summary_add_preview (folder->summary, mi);
	}

	/* now we 'fudge' the summary  to tell it its uptodate, because its idea of uptodate has just changed */
	/* the stat really shouldn't fail, we just wrote to it */
	if (g_stat (lf->folder_path, &st) == 0) {
		((CamelFolderSummary *) mbs)->time = st.st_mtime;
		mbs->folder_size = st.st_size;
	}

	/* unlock as soon as we can */
	camel_local_folder_unlock (lf);

	if (camel_folder_change_info_changed (lf->changes)) {
		camel_folder_changed (folder, lf->changes);
		camel_folder_change_info_clear (lf->changes);
	}

	if (appended_uid)
		*appended_uid = g_strdup(camel_message_info_get_uid(mi));

	return TRUE;

fail_write:
	g_prefix_error (
		error, _("Cannot append message to mbox file: %s: "),
		lf->folder_path);

	if (output_stream) {
		gint fd;

		fd = camel_stream_fs_get_fd (CAMEL_STREAM_FS (output_stream));
		if (fd != -1) {
			/* reset the file to original size */
			do {
				retval = ftruncate (fd, mbs->folder_size);
			} while (retval == -1 && errno == EINTR);
		}

		g_object_unref (output_stream);
	}

	if (filter_stream)
		g_object_unref (filter_stream);

	g_free (fromline);

	/* remove the summary info so we are not out-of-sync with the mbox */
	camel_folder_summary_remove (CAMEL_FOLDER_SUMMARY (mbs), mi);

	/* and tell the summary it's up-to-date */
	if (g_stat (lf->folder_path, &st) == 0) {
		((CamelFolderSummary *) mbs)->time = st.st_mtime;
		mbs->folder_size = st.st_size;
	}

fail:
	/* make sure we unlock the folder - before we start triggering events into appland */
	camel_local_folder_unlock (lf);

	/* cascade the changes through, anyway, if there are any outstanding */
	if (camel_folder_change_info_changed (lf->changes)) {
		camel_folder_changed (folder, lf->changes);
		camel_folder_change_info_clear (lf->changes);
	}

	return FALSE;
}
static gboolean
mh_folder_append_message_sync (CamelFolder *folder,
                               CamelMimeMessage *message,
                               CamelMessageInfo *info,
                               gchar **appended_uid,
                               GCancellable *cancellable,
                               GError **error)
{
	CamelLocalFolder *lf = (CamelLocalFolder *) folder;
	CamelStream *output_stream;
	CamelMessageInfo *mi;
	gchar *name;
	gboolean has_attachment;

	/* FIXME: probably needs additional locking (although mh doesn't appear do do it) */

	d(printf("Appending message\n"));

	/* If we can't lock, don't do anything */
	if (!lf || camel_local_folder_lock (lf, CAMEL_LOCK_WRITE, error) == -1)
		return FALSE;

	/* add it to the summary/assign the uid, etc */
	mi = camel_local_summary_add ((CamelLocalSummary *) folder->summary, message, info, lf->changes, error);
	if (mi == NULL)
		goto check_changed;

	has_attachment = camel_mime_message_has_attachment (message);
	if (((camel_message_info_flags (mi) & CAMEL_MESSAGE_ATTACHMENTS) && !has_attachment) ||
	    ((camel_message_info_flags (mi) & CAMEL_MESSAGE_ATTACHMENTS) == 0 && has_attachment)) {
		camel_message_info_set_flags (mi, CAMEL_MESSAGE_ATTACHMENTS, has_attachment ? CAMEL_MESSAGE_ATTACHMENTS : 0);
	}

	d(printf("Appending message: uid is %s\n", camel_message_info_uid(mi)));

	/* write it out, use the uid we got from the summary */
	name = g_strdup_printf("%s/%s", lf->folder_path, camel_message_info_uid(mi));
	output_stream = camel_stream_fs_new_with_name (
		name, O_WRONLY | O_CREAT, 0600, error);
	if (output_stream == NULL)
		goto fail_write;

	if (camel_data_wrapper_write_to_stream_sync (
		(CamelDataWrapper *) message, output_stream, cancellable, error) == -1
	    || camel_stream_close (output_stream, cancellable, error) == -1)
		goto fail_write;

	/* close this? */
	g_object_unref (output_stream);

	g_free (name);

	if (appended_uid)
		*appended_uid = g_strdup(camel_message_info_uid(mi));

	goto check_changed;

 fail_write:

	/* remove the summary info so we are not out-of-sync with the mh folder */
	camel_folder_summary_remove_uid (CAMEL_FOLDER_SUMMARY (folder->summary),
					 camel_message_info_uid (mi));

	g_prefix_error (
		error, _("Cannot append message to mh folder: %s: "), name);

	if (output_stream) {
		g_object_unref (output_stream);
		unlink (name);
	}

	g_free (name);

 check_changed:
	camel_local_folder_unlock (lf);

	if (camel_folder_change_info_changed (lf->changes)) {
		camel_folder_changed (folder, lf->changes);
		camel_folder_change_info_clear (lf->changes);
	}

	return TRUE;
}
static CamelMimeMessage *
mh_folder_get_message_sync (CamelFolder *folder,
                            const gchar *uid,
                            GCancellable *cancellable,
                            GError **error)
{
	CamelLocalFolder *lf = (CamelLocalFolder *) folder;
	CamelStream *message_stream = NULL;
	CamelMimeMessage *message = NULL;
	CamelMessageInfo *info;
	gchar *name = NULL;

	d(printf("getting message: %s\n", uid));

	if (!lf || camel_local_folder_lock (lf, CAMEL_LOCK_WRITE, error) == -1)
		return NULL;

	/* get the message summary info */
	if ((info = camel_folder_summary_get (folder->summary, uid)) == NULL) {
		set_cannot_get_message_ex (
			error, CAMEL_FOLDER_ERROR_INVALID_UID,
			uid, lf->folder_path, _("No such message"));
		goto fail;
	}

	/* we only need it to check the message exists */
	camel_message_info_free (info);

	name = g_strdup_printf("%s/%s", lf->folder_path, uid);
	message_stream = camel_stream_fs_new_with_name (
		name, O_RDONLY, 0, error);
	if (message_stream == NULL) {
		g_prefix_error (
			error, _("Cannot get message %s from folder %s: "),
			name, lf->folder_path);
		goto fail;
	}

	message = camel_mime_message_new ();
	if (!camel_data_wrapper_construct_from_stream_sync (
		(CamelDataWrapper *) message,
		message_stream, cancellable, error)) {
		g_prefix_error (
			error, _("Cannot get message %s from folder %s: "),
			name, lf->folder_path);
		g_object_unref (message);
		message = NULL;

	}
	g_object_unref (message_stream);

 fail:
	g_free (name);

	camel_local_folder_unlock (lf);

	if (camel_folder_change_info_changed (lf->changes)) {
		camel_folder_changed (folder, lf->changes);
		camel_folder_change_info_clear (lf->changes);
	}

	return message;
}
static CamelMimeMessage *
nntp_folder_get_message_sync (CamelFolder *folder,
                              const gchar *uid,
                              GCancellable *cancellable,
                              GError **error)
{
	CamelStore *parent_store;
	CamelMimeMessage *message = NULL;
	CamelDataCache *nntp_cache;
	CamelNNTPStore *nntp_store;
	CamelFolderChangeInfo *changes;
	CamelNNTPFolder *nntp_folder;
	CamelStream *stream = NULL;
	GIOStream *base_stream;
	gchar *article, *msgid;
	gsize article_len;

	parent_store = camel_folder_get_parent_store (folder);

	nntp_folder = CAMEL_NNTP_FOLDER (folder);
	nntp_store = CAMEL_NNTP_STORE (parent_store);

	article_len = strlen (uid) + 1;
	article = alloca (article_len);
	g_strlcpy (article, uid, article_len);
	msgid = strchr (article, ',');
	if (msgid == NULL) {
		g_set_error (
			error, CAMEL_ERROR, CAMEL_ERROR_GENERIC,
			_("Internal error: UID in invalid format: %s"), uid);
		return NULL;
	}
	*msgid++ = 0;

	/* Lookup in cache, NEWS is global messageid's so use a global cache path */
	nntp_cache = camel_nntp_store_ref_cache (nntp_store);
	base_stream = camel_data_cache_get (nntp_cache, "cache", msgid, NULL);
	g_clear_object (&nntp_cache);

	if (base_stream != NULL) {
		stream = camel_stream_new (base_stream);
		g_object_unref (base_stream);
	} else {
		CamelServiceConnectionStatus connection_status;

		connection_status = camel_service_get_connection_status (
			CAMEL_SERVICE (parent_store));

		if (connection_status != CAMEL_SERVICE_CONNECTED) {
			g_set_error (
				error, CAMEL_SERVICE_ERROR,
				CAMEL_SERVICE_ERROR_UNAVAILABLE,
				_("This message is not currently available"));
			goto fail;
		}

		stream = nntp_folder_download_message (nntp_folder, article, msgid, cancellable, error);
		if (stream == NULL)
			goto fail;
	}

	message = camel_mime_message_new ();
	if (!camel_data_wrapper_construct_from_stream_sync ((CamelDataWrapper *) message, stream, cancellable, error)) {
		g_prefix_error (error, _("Cannot get message %s: "), uid);
		g_object_unref (message);
		message = NULL;
	}

	g_object_unref (stream);
fail:
	if (camel_folder_change_info_changed (nntp_folder->changes)) {
		changes = nntp_folder->changes;
		nntp_folder->changes = camel_folder_change_info_new ();
	} else {
		changes = NULL;
	}

	if (changes) {
		camel_folder_changed (folder, changes);
		camel_folder_change_info_free (changes);
	}

	return message;
}