moved more modules to libsylph.

git-svn-id: svn://sylpheed.sraoss.jp/sylpheed/trunk@548 ee746299-78ed-0310-b773-934348b2243d

1 files changed, 4105 insertions, 0 deletions

diff --git a/libsylph/imap.c b/libsylph/imap.c
new file mode 100644
index 00000000..a179c23c
--- /dev/null
+++ b/libsylph/imap.c
@@ -0,0 +1,4105 @@
+/*
+ * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
+ * Copyright (C) 1999-2005 Hiroyuki Yamamoto
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 "defs.h"
+
+#include <glib.h>
+#include <glib/gi18n.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <time.h>
+#if HAVE_ICONV
+#  include <iconv.h>
+#endif
+
+#include "imap.h"
+#include "socket.h"
+#include "ssl.h"
+#include "recv.h"
+#include "procmsg.h"
+#include "procheader.h"
+#include "folder.h"
+#include "prefs_account.h"
+#include "codeconv.h"
+#include "md5.h"
+#include "base64.h"
+#include "utils.h"
+#include "prefs_common.h"
+
+#define IMAP4_PORT	143
+#if USE_SSL
+#define IMAPS_PORT	993
+#endif
+
+#define IMAP_CMD_LIMIT	1000
+
+#define QUOTE_IF_REQUIRED(out, str)				\
+{								\
+	if (*str != '"' && strpbrk(str, " \t(){}%*") != NULL) {	\
+		gchar *__tmp;					\
+		gint len;					\
+								\
+		len = strlen(str) + 3;				\
+		Xalloca(__tmp, len, return IMAP_ERROR);		\
+		g_snprintf(__tmp, len, "\"%s\"", str);		\
+		out = __tmp;					\
+	} else {						\
+		Xstrdup_a(out, str, return IMAP_ERROR);		\
+	}							\
+}
+
+static GList *session_list = NULL;
+
+static void imap_folder_init		(Folder		*folder,
+					 const gchar	*name,
+					 const gchar	*path);
+
+static Folder	*imap_folder_new	(const gchar	*name,
+					 const gchar	*path);
+static void	 imap_folder_destroy	(Folder		*folder);
+
+static Session *imap_session_new	(PrefsAccount	*account);
+static gint imap_session_connect	(IMAPSession	*session);
+static gint imap_session_reconnect	(IMAPSession	*session);
+static void imap_session_destroy	(Session	*session);
+/* static void imap_session_destroy_all	(void); */
+
+static gint imap_search_flags		(IMAPSession	*session,
+					 GArray	       **uids,
+					 GHashTable    **flags_table);
+static gint imap_fetch_flags		(IMAPSession	*session,
+					 GArray	       **uids,
+					 GHashTable    **flags_table);
+
+static GSList *imap_get_msg_list	(Folder		*folder,
+					 FolderItem	*item,
+					 gboolean	 use_cache);
+static gchar *imap_fetch_msg		(Folder		*folder,
+					 FolderItem	*item,
+					 gint		 uid);
+static MsgInfo *imap_get_msginfo	(Folder		*folder,
+					 FolderItem	*item,
+					 gint		 uid);
+static gint imap_add_msg		(Folder		*folder,
+					 FolderItem	*dest,
+					 const gchar	*file,
+					 MsgFlags	*flags,
+					 gboolean	 remove_source);
+static gint imap_add_msgs		(Folder		*folder,
+					 FolderItem	*dest,
+					 GSList		*file_list,
+					 gboolean	 remove_source,
+					 gint		*first);
+
+static gint imap_move_msg		(Folder		*folder,
+					 FolderItem	*dest,
+					 MsgInfo	*msginfo);
+static gint imap_move_msgs		(Folder		*folder,
+					 FolderItem	*dest,
+					 GSList		*msglist);
+static gint imap_copy_msg		(Folder		*folder,
+					 FolderItem	*dest,
+					 MsgInfo	*msginfo);
+static gint imap_copy_msgs		(Folder		*folder,
+					 FolderItem	*dest,
+					 GSList		*msglist);
+
+static gint imap_remove_msg		(Folder		*folder,
+					 FolderItem	*item,
+					 MsgInfo	*msginfo);
+static gint imap_remove_msgs		(Folder		*folder,
+					 FolderItem	*item,
+					 GSList		*msglist);
+static gint imap_remove_all_msg		(Folder		*folder,
+					 FolderItem	*item);
+
+static gboolean imap_is_msg_changed	(Folder		*folder,
+					 FolderItem	*item,
+					 MsgInfo	*msginfo);
+
+static gint imap_close			(Folder		*folder,
+					 FolderItem	*item);
+
+static gint imap_scan_folder		(Folder		*folder,
+					 FolderItem	*item);
+static gint imap_scan_tree		(Folder		*folder);
+
+static gint imap_create_tree		(Folder		*folder);
+
+static FolderItem *imap_create_folder	(Folder		*folder,
+					 FolderItem	*parent,
+					 const gchar	*name);
+static gint imap_rename_folder		(Folder		*folder,
+					 FolderItem	*item,
+					 const gchar	*name);
+static gint imap_move_folder		(Folder		*folder,
+					 FolderItem	*item,
+					 FolderItem	*new_parent);
+static gint imap_remove_folder		(Folder		*folder,
+					 FolderItem	*item);
+
+static IMAPSession *imap_session_get	(Folder		*folder);
+
+static gint imap_greeting		(IMAPSession	*session);
+static gint imap_auth			(IMAPSession	*session,
+					 const gchar	*user,
+					 const gchar	*pass,
+					 IMAPAuthType	 type);
+
+static gint imap_scan_tree_recursive	(IMAPSession	*session,
+					 FolderItem	*item);
+static GSList *imap_parse_list		(IMAPSession	*session,
+					 const gchar	*real_path,
+					 gchar		*separator);
+
+static void imap_create_missing_folders	(Folder			*folder);
+static FolderItem *imap_create_special_folder
+					(Folder			*folder,
+					 SpecialFolderItemType	 stype,
+					 const gchar		*name);
+
+static gint imap_do_copy_msgs		(Folder		*folder,
+					 FolderItem	*dest, 
+					 GSList		*msglist,
+					 gboolean	 remove_source);
+static gint imap_remove_msgs_by_seq_set	(Folder		*folder,
+					 FolderItem	*item,
+					 GSList		*seq_list);
+
+static GSList *imap_get_uncached_messages	(IMAPSession	*session,
+						 FolderItem	*item,
+						 guint32	 first_uid,
+						 guint32	 last_uid,
+						 gboolean	 update_count);
+static void imap_delete_cached_message		(FolderItem	*item,
+						 guint32	 uid);
+static GSList *imap_delete_cached_messages	(GSList		*mlist,
+						 FolderItem	*item,
+						 guint32	 first_uid,
+						 guint32	 last_uid);
+static void imap_delete_all_cached_messages	(FolderItem	*item);
+
+#if USE_SSL
+static SockInfo *imap_open		(const gchar	*server,
+					 gushort	 port,
+					 SSLType	 ssl_type);
+#else
+static SockInfo *imap_open		(const gchar	*server,
+					 gushort	 port);
+#endif
+
+static gint imap_msg_list_change_perm_flags	(GSList		*msglist,
+						 MsgPermFlags	 flags,
+						 gboolean	 is_set);
+static gchar *imap_get_flag_str			(IMAPFlags	 flags);
+static gint imap_set_message_flags		(IMAPSession	*session,
+						 const gchar	*seq_set,
+						 IMAPFlags	 flags,
+						 gboolean	 is_set);
+static gint imap_select				(IMAPSession	*session,
+						 IMAPFolder	*folder,
+						 const gchar	*path,
+						 gint		*exists,
+						 gint		*recent,
+						 gint		*unseen,
+						 guint32	*uid_validity);
+static gint imap_status				(IMAPSession	*session,
+						 IMAPFolder	*folder,
+						 const gchar	*path,
+						 gint		*messages,
+						 gint		*recent,
+						 guint32	*uid_next,
+						 guint32	*uid_validity,
+						 gint		*unseen);
+
+static void imap_parse_namespace		(IMAPSession	*session,
+						 IMAPFolder	*folder);
+static void imap_get_namespace_by_list		(IMAPSession	*session,
+						 IMAPFolder	*folder);
+static IMAPNameSpace *imap_find_namespace	(IMAPFolder	*folder,
+						 const gchar	*path);
+static gchar imap_get_path_separator		(IMAPFolder	*folder,
+						 const gchar	*path);
+static gchar *imap_get_real_path		(IMAPFolder	*folder,
+						 const gchar	*path);
+
+static gchar *imap_parse_atom		(IMAPSession	*session,
+					 gchar		*src,
+					 gchar		*dest,
+					 gint		 dest_len,
+					 GString	*str);
+static MsgFlags imap_parse_flags	(const gchar	*flag_str);
+static IMAPFlags imap_parse_imap_flags	(const gchar	*flag_str);
+static MsgInfo *imap_parse_envelope	(IMAPSession	*session,
+					 FolderItem	*item,
+					 GString	*line_str);
+
+static gboolean imap_has_capability	(IMAPSession	*session,
+					 const gchar	*capability);
+static void imap_capability_free	(IMAPSession	*session);
+
+/* low-level IMAP4rev1 commands */
+static gint imap_cmd_capability	(IMAPSession	*session);
+static gint imap_cmd_authenticate
+				(IMAPSession	*session,
+				 const gchar	*user,
+				 const gchar	*pass,
+				 IMAPAuthType	 type);
+static gint imap_cmd_login	(IMAPSession	*session,
+				 const gchar	*user,
+				 const gchar	*pass);
+static gint imap_cmd_logout	(IMAPSession	*session);
+static gint imap_cmd_noop	(IMAPSession	*session);
+#if USE_SSL
+static gint imap_cmd_starttls	(IMAPSession	*session);
+#endif
+static gint imap_cmd_namespace	(IMAPSession	*session,
+				 gchar	       **ns_str);
+static gint imap_cmd_list	(IMAPSession	*session,
+				 const gchar	*ref,
+				 const gchar	*mailbox,
+				 GPtrArray	*argbuf);
+static gint imap_cmd_do_select	(IMAPSession	*session,
+				 const gchar	*folder,
+				 gboolean	 examine,
+				 gint		*exists,
+				 gint		*recent,
+				 gint		*unseen,
+				 guint32	*uid_validity);
+static gint imap_cmd_select	(IMAPSession	*session,
+				 const gchar	*folder,
+				 gint		*exists,
+				 gint		*recent,
+				 gint		*unseen,
+				 guint32	*uid_validity);
+static gint imap_cmd_examine	(IMAPSession	*session,
+				 const gchar	*folder,
+				 gint		*exists,
+				 gint		*recent,
+				 gint		*unseen,
+				 guint32	*uid_validity);
+static gint imap_cmd_create	(IMAPSession	*session,
+				 const gchar	*folder);
+static gint imap_cmd_rename	(IMAPSession	*session,
+				 const gchar	*oldfolder,
+				 const gchar	*newfolder);
+static gint imap_cmd_delete	(IMAPSession	*session,
+				 const gchar	*folder);
+static gint imap_cmd_envelope	(IMAPSession	*session,
+				 const gchar	*seq_set);
+static gint imap_cmd_search	(IMAPSession	*session,
+				 const gchar	*criteria,
+				 GArray        **result);
+static gint imap_cmd_fetch	(IMAPSession	*session,
+				 guint32	 uid,
+				 const gchar	*filename);
+static gint imap_cmd_append	(IMAPSession	*session,
+				 const gchar	*destfolder,
+				 const gchar	*file,
+				 IMAPFlags	 flags,
+				 guint32	*new_uid);
+static gint imap_cmd_copy	(IMAPSession	*session,
+				 const gchar	*seq_set,
+				 const gchar	*destfolder);
+static gint imap_cmd_store	(IMAPSession	*session,
+				 const gchar	*seq_set,
+				 const gchar	*sub_cmd);
+static gint imap_cmd_expunge	(IMAPSession	*session);
+static gint imap_cmd_close	(IMAPSession	*session);
+
+static gint imap_cmd_ok		(IMAPSession	*session,
+				 GPtrArray	*argbuf);
+static void imap_cmd_gen_send	(IMAPSession	*session,
+				 const gchar	*format, ...);
+static gint imap_cmd_gen_recv	(IMAPSession	*session,
+				 gchar	       **ret);
+
+/* misc utility functions */
+static gchar *strchr_cpy			(const gchar	*src,
+						 gchar		 ch,
+						 gchar		*dest,
+						 gint		 len);
+static gchar *get_quoted			(const gchar	*src,
+						 gchar		 ch,
+						 gchar		*dest,
+						 gint		 len);
+static gchar *search_array_contain_str		(GPtrArray	*array,
+						 gchar		*str);
+static gchar *search_array_str			(GPtrArray	*array,
+						 gchar		*str);
+static void imap_path_separator_subst		(gchar		*str,
+						 gchar		 separator);
+
+static gchar *imap_modified_utf7_to_utf8	(const gchar	*mutf7_str);
+static gchar *imap_utf8_to_modified_utf7	(const gchar	*from);
+
+static GSList *imap_get_seq_set_from_msglist	(GSList		*msglist);
+static void imap_seq_set_free			(GSList		*seq_list);
+
+static GHashTable *imap_get_uid_table		(GArray		*array);
+
+static gboolean imap_rename_folder_func		(GNode		*node,
+						 gpointer	 data);
+
+static FolderClass imap_class =
+{
+	F_IMAP,
+
+	imap_folder_new,
+	imap_folder_destroy,
+
+	imap_scan_tree,
+	imap_create_tree,
+
+	imap_get_msg_list,
+	imap_fetch_msg,
+	imap_get_msginfo,
+	imap_add_msg,
+	imap_add_msgs,
+	imap_move_msg,
+	imap_move_msgs,
+	imap_copy_msg,
+	imap_copy_msgs,
+	imap_remove_msg,
+	imap_remove_msgs,
+	imap_remove_all_msg,
+	imap_is_msg_changed,
+	imap_close,
+	imap_scan_folder,
+
+	imap_create_folder,
+	imap_rename_folder,
+	imap_move_folder,
+	imap_remove_folder
+};
+
+
+FolderClass *imap_get_class(void)
+{
+	return &imap_class;
+}
+
+static Folder *imap_folder_new(const gchar *name, const gchar *path)
+{
+	Folder *folder;
+
+	folder = (Folder *)g_new0(IMAPFolder, 1);
+	imap_folder_init(folder, name, path);
+
+	return folder;
+}
+
+static void imap_folder_destroy(Folder *folder)
+{
+	gchar *dir;
+
+	dir = folder_get_path(folder);
+	if (is_dir_exist(dir))
+		remove_dir_recursive(dir);
+	g_free(dir);
+
+	folder_remote_folder_destroy(REMOTE_FOLDER(folder));
+}
+
+static void imap_folder_init(Folder *folder, const gchar *name,
+			     const gchar *path)
+{
+	folder->klass = imap_get_class();
+	folder_remote_folder_init(folder, name, path);
+}
+
+static IMAPSession *imap_session_get(Folder *folder)
+{
+	RemoteFolder *rfolder = REMOTE_FOLDER(folder);
+
+	g_return_val_if_fail(folder != NULL, NULL);
+	g_return_val_if_fail(FOLDER_TYPE(folder) == F_IMAP, NULL);
+	g_return_val_if_fail(folder->account != NULL, NULL);
+
+	if (!prefs_common.online_mode)
+		return NULL;
+
+	if (!rfolder->session) {
+		rfolder->session = imap_session_new(folder->account);
+		if (rfolder->session)
+			imap_parse_namespace(IMAP_SESSION(rfolder->session),
+					     IMAP_FOLDER(folder));
+		return IMAP_SESSION(rfolder->session);
+	}
+
+	if (time(NULL) - rfolder->session->last_access_time <
+		SESSION_TIMEOUT_INTERVAL) {
+		return IMAP_SESSION(rfolder->session);
+	}
+
+	if (imap_cmd_noop(IMAP_SESSION(rfolder->session)) != IMAP_SUCCESS) {
+		log_warning(_("IMAP4 connection to %s has been"
+			      " disconnected. Reconnecting...\n"),
+			    folder->account->recv_server);
+		if (imap_session_reconnect(IMAP_SESSION(rfolder->session))
+		    == IMAP_SUCCESS)
+			imap_parse_namespace(IMAP_SESSION(rfolder->session),
+					     IMAP_FOLDER(folder));
+		else {
+			session_destroy(rfolder->session);
+			rfolder->session = NULL;
+		}
+	}
+
+	return IMAP_SESSION(rfolder->session);
+}
+
+static gint imap_greeting(IMAPSession *session)
+{
+	gchar *greeting;
+	gint ok;
+
+	if ((ok = imap_cmd_gen_recv(session, &greeting)) != IMAP_SUCCESS)
+		return ok;
+
+	if (greeting[0] != '*' || greeting[1] != ' ')
+		ok = IMAP_ERROR;
+	else if (!strncmp(greeting + 2, "OK", 2))
+		ok = IMAP_SUCCESS;
+	else if (!strncmp(greeting + 2, "PREAUTH", 7)) {
+		session->authenticated = TRUE;
+		ok = IMAP_SUCCESS;
+	} else
+		ok = IMAP_ERROR;
+
+	g_free(greeting);
+	return ok;
+}
+
+static gint imap_auth(IMAPSession *session, const gchar *user,
+		      const gchar *pass, IMAPAuthType type)
+{
+	gboolean nologin;
+	gint ok = IMAP_AUTHFAIL;
+
+	nologin = imap_has_capability(session, "LOGINDISABLED");
+
+	switch (type) {
+	case 0:
+		if (imap_has_capability(session, "AUTH=CRAM-MD5"))
+			ok = imap_cmd_authenticate(session, user, pass, type);
+		else if (nologin)
+			log_print(_("IMAP4 server disables LOGIN.\n"));
+		else
+			ok = imap_cmd_login(session, user, pass);
+		break;
+	case IMAP_AUTH_LOGIN:
+		if (nologin)
+			log_warning(_("IMAP4 server disables LOGIN.\n"));
+		else
+			ok = imap_cmd_login(session, user, pass);
+		break;
+	case IMAP_AUTH_CRAM_MD5:
+		ok = imap_cmd_authenticate(session, user, pass, type);
+		break;
+	default:
+		break;
+	}
+
+	if (ok == IMAP_SUCCESS)
+		session->authenticated = TRUE;
+
+	return ok;
+}
+
+static Session *imap_session_new(PrefsAccount *account)
+{
+	IMAPSession *session;
+	gushort port;
+
+	g_return_val_if_fail(account != NULL, NULL);
+	g_return_val_if_fail(account->recv_server != NULL, NULL);
+	g_return_val_if_fail(account->userid != NULL, NULL);
+
+#if USE_SSL
+	port = account->set_imapport ? account->imapport
+		: account->ssl_imap == SSL_TUNNEL ? IMAPS_PORT : IMAP4_PORT;
+#else
+	port = account->set_imapport ? account->imapport : IMAP4_PORT;
+#endif
+
+	session = g_new0(IMAPSession, 1);
+
+	session_init(SESSION(session));
+
+	SESSION(session)->type             = SESSION_IMAP;
+	SESSION(session)->sock             = NULL;
+	SESSION(session)->server           = g_strdup(account->recv_server);
+	SESSION(session)->port             = port;
+#if USE_SSL
+	SESSION(session)->ssl_type         = account->ssl_imap;
+#endif
+	SESSION(session)->last_access_time = time(NULL);
+	SESSION(session)->data             = account;
+
+	SESSION(session)->destroy          = imap_session_destroy;
+
+	session->authenticated = FALSE;
+	session->capability    = NULL;
+	session->uidplus       = FALSE;
+	session->mbox          = NULL;
+	session->cmd_count     = 0;
+
+	session_list = g_list_append(session_list, session);
+
+	if (imap_session_connect(session) != IMAP_SUCCESS) {
+		session_destroy(SESSION(session));
+		return NULL;
+	}
+
+	return SESSION(session);
+}
+
+static gint imap_session_connect(IMAPSession *session)
+{
+	SockInfo *sock;
+	PrefsAccount *account;
+	gchar *pass;
+
+	g_return_val_if_fail(session != NULL, IMAP_ERROR);
+
+	account = (PrefsAccount *)(SESSION(session)->data);
+
+	log_message(_("creating IMAP4 connection to %s:%d ...\n"),
+		    SESSION(session)->server, SESSION(session)->port);
+
+	pass = account->passwd;
+	if (!pass) {
+		gchar *tmp_pass;
+		tmp_pass = input_query_password(account->recv_server,
+						account->userid);
+		if (!tmp_pass)
+			return IMAP_ERROR;
+		Xstrdup_a(pass, tmp_pass,
+			  {g_free(tmp_pass); return IMAP_ERROR;});
+		g_free(tmp_pass);
+	}
+
+#if USE_SSL
+	if ((sock = imap_open(SESSION(session)->server, SESSION(session)->port,
+			      SESSION(session)->ssl_type)) == NULL)
+#else
+	if ((sock = imap_open(SESSION(session)->server, SESSION(session)->port))
+	    == NULL)
+#endif
+		return IMAP_ERROR;
+
+	SESSION(session)->sock = sock;
+
+	if (imap_greeting(session) != IMAP_SUCCESS)
+		return IMAP_ERROR;
+	if (imap_cmd_capability(session) != IMAP_SUCCESS)
+		return IMAP_ERROR;
+
+	if (imap_has_capability(session, "UIDPLUS"))
+		session->uidplus = TRUE;
+
+#if USE_SSL
+	if (account->ssl_imap == SSL_STARTTLS &&
+	    imap_has_capability(session, "STARTTLS")) {
+		gint ok;
+
+		ok = imap_cmd_starttls(session);
+		if (ok != IMAP_SUCCESS) {
+			log_warning(_("Can't start TLS session.\n"));
+			return IMAP_ERROR;
+		}
+		if (!ssl_init_socket_with_method(sock, SSL_METHOD_TLSv1))
+			return IMAP_SOCKET;
+
+		/* capability can be changed after STARTTLS */
+		if (imap_cmd_capability(session) != IMAP_SUCCESS)
+			return IMAP_ERROR;
+	}
+#endif
+
+	if (!session->authenticated &&
+	    imap_auth(session, account->userid, pass, account->imap_auth_type)
+	    != IMAP_SUCCESS) {
+		imap_cmd_logout(session);
+		return IMAP_AUTHFAIL;
+	}
+
+	return IMAP_SUCCESS;
+}
+
+static gint imap_session_reconnect(IMAPSession *session)
+{
+	g_return_val_if_fail(session != NULL, IMAP_ERROR);
+
+	session_disconnect(SESSION(session));
+
+	imap_capability_free(session);
+	session->uidplus = FALSE;
+	g_free(session->mbox);
+	session->mbox = NULL;
+	session->authenticated = FALSE;
+	SESSION(session)->state = SESSION_READY;
+
+	return imap_session_connect(session);
+}
+
+static void imap_session_destroy(Session *session)
+{
+	imap_capability_free(IMAP_SESSION(session));
+	g_free(IMAP_SESSION(session)->mbox);
+	session_list = g_list_remove(session_list, session);
+}
+
+#if 0
+static void imap_session_destroy_all(void)
+{
+	while (session_list != NULL) {
+		IMAPSession *session = (IMAPSession *)session_list->data;
+
+		imap_cmd_logout(session);
+		session_destroy(SESSION(session));
+	}
+}
+#endif
+
+#define THROW goto catch
+
+static gint imap_search_flags(IMAPSession *session, GArray **uids,
+			      GHashTable **flags_table)
+{
+	gint ok;
+	gint i;
+	GArray *flag_uids;
+	GHashTable *unseen_table;
+	GHashTable *flagged_table;
+	GHashTable *answered_table;
+	guint32 uid;
+	IMAPFlags flags;
+
+	ok = imap_cmd_search(session, "ALL", uids);
+	if (ok != IMAP_SUCCESS) return ok;
+
+	ok = imap_cmd_search(session, "UNSEEN", &flag_uids);
+	if (ok != IMAP_SUCCESS) {
+		g_array_free(*uids, TRUE);
+		return ok;
+	}
+	unseen_table = imap_get_uid_table(flag_uids);
+	g_array_free(flag_uids, TRUE);
+	ok = imap_cmd_search(session, "FLAGGED", &flag_uids);
+	if (ok != IMAP_SUCCESS) {
+		g_hash_table_destroy(unseen_table);
+		g_array_free(*uids, TRUE);
+		return ok;
+	}
+	flagged_table = imap_get_uid_table(flag_uids);
+	g_array_free(flag_uids, TRUE);
+	ok = imap_cmd_search(session, "ANSWERED", &flag_uids);
+	if (ok != IMAP_SUCCESS) {
+		g_hash_table_destroy(flagged_table);
+		g_hash_table_destroy(unseen_table);
+		g_array_free(*uids, TRUE);
+		return ok;
+	}
+	answered_table = imap_get_uid_table(flag_uids);
+	g_array_free(flag_uids, TRUE);
+
+	*flags_table = g_hash_table_new(NULL, g_direct_equal);
+
+	for (i = 0; i < (*uids)->len; i++) {
+		uid = g_array_index(*uids, guint32, i);
+		flags = IMAP_FLAG_DRAFT;
+		if (!g_hash_table_lookup(unseen_table, GUINT_TO_POINTER(uid)))
+			flags |= IMAP_FLAG_SEEN;
+		if (g_hash_table_lookup(flagged_table, GUINT_TO_POINTER(uid)))
+			flags |= IMAP_FLAG_FLAGGED;
+		if (g_hash_table_lookup(answered_table, GUINT_TO_POINTER(uid)))
+			flags |= IMAP_FLAG_ANSWERED;
+		g_hash_table_insert(*flags_table, GUINT_TO_POINTER(uid),
+				    GINT_TO_POINTER(flags));
+	}
+
+	g_hash_table_destroy(answered_table);
+	g_hash_table_destroy(flagged_table);
+	g_hash_table_destroy(unseen_table);
+
+	return IMAP_SUCCESS;
+}
+
+static gint imap_fetch_flags(IMAPSession *session, GArray **uids,
+			     GHashTable **flags_table)
+{
+	gint ok;
+	gchar *tmp;
+	gchar *cur_pos;
+	gchar buf[IMAPBUFSIZE];
+	guint32 uid;
+	IMAPFlags flags;
+
+	imap_cmd_gen_send(session, "UID FETCH 1:* (UID FLAGS)");
+
+	*uids = g_array_new(FALSE, FALSE, sizeof(guint32));
+	*flags_table = g_hash_table_new(NULL, g_direct_equal);
+
+	while ((ok = imap_cmd_gen_recv(session, &tmp)) == IMAP_SUCCESS) {
+		if (tmp[0] != '*' || tmp[1] != ' ') {
+			g_free(tmp);
+			break;
+		}
+		cur_pos = tmp + 2;
+
+#define PARSE_ONE_ELEMENT(ch)					\
+{								\
+	cur_pos = strchr_cpy(cur_pos, ch, buf, sizeof(buf));	\
+	if (cur_pos == NULL) {					\
+		g_warning("cur_pos == NULL\n");			\
+		g_free(tmp);					\
+		g_hash_table_destroy(*flags_table);		\
+		g_array_free(*uids, TRUE);			\
+		return IMAP_ERROR;				\
+	}							\
+}
+
+		PARSE_ONE_ELEMENT(' ');
+		PARSE_ONE_ELEMENT(' ');
+		if (strcmp(buf, "FETCH") != 0) {
+			g_free(tmp);
+			continue;
+		}
+		if (*cur_pos != '(') {
+			g_free(tmp);
+			continue;
+		}
+		cur_pos++;
+		uid = 0;
+		flags = 0;
+
+		while (*cur_pos != '\0' && *cur_pos != ')') {
+			while (*cur_pos == ' ') cur_pos++;
+
+			if (!strncmp(cur_pos, "UID ", 4)) {
+				cur_pos += 4;
+				uid = strtoul(cur_pos, &cur_pos, 10);
+			} else if (!strncmp(cur_pos, "FLAGS ", 6)) {
+				cur_pos += 6;
+				if (*cur_pos != '(') {
+					g_warning("*cur_pos != '('\n");
+					break;
+				}
+				cur_pos++;
+				PARSE_ONE_ELEMENT(')');
+				flags = imap_parse_imap_flags(buf);
+				flags |= IMAP_FLAG_DRAFT;
+			} else {
+				g_warning("invalid FETCH response: %s\n", cur_pos);
+				break;
+			}
+		}
+
+#undef PARSE_ONE_ELEMENT
+
+		if (uid > 0) {
+			g_array_append_val(*uids, uid);
+			g_hash_table_insert(*flags_table, GUINT_TO_POINTER(uid),
+					    GINT_TO_POINTER(flags));
+		}
+
+		g_free(tmp);
+	}
+
+	if (ok != IMAP_SUCCESS) {
+		g_hash_table_destroy(*flags_table);
+		g_array_free(*uids, TRUE);
+	}
+
+	return ok;
+}
+
+static GSList *imap_get_msg_list(Folder *folder, FolderItem *item,
+				 gboolean use_cache)
+{
+	GSList *mlist = NULL;
+	IMAPSession *session;
+	gint ok, exists = 0, recent = 0, unseen = 0;
+	guint32 uid_validity = 0;
+	guint32 first_uid = 0, last_uid = 0;
+
+	g_return_val_if_fail(folder != NULL, NULL);
+	g_return_val_if_fail(item != NULL, NULL);
+	g_return_val_if_fail(FOLDER_TYPE(folder) == F_IMAP, NULL);
+	g_return_val_if_fail(folder->account != NULL, NULL);
+
+	item->new = item->unread = item->total = 0;
+
+	session = imap_session_get(folder);
+
+	if (!session) {
+		mlist = procmsg_read_cache(item, FALSE);
+		item->last_num = procmsg_get_last_num_in_msg_list(mlist);
+		procmsg_set_flags(mlist, item);
+		return mlist;
+	}
+
+	ok = imap_select(session, IMAP_FOLDER(folder), item->path,
+			 &exists, &recent, &unseen, &uid_validity);
+	if (ok != IMAP_SUCCESS) THROW;
+
+	if (exists == 0) {
+		imap_delete_all_cached_messages(item);
+		return NULL;
+	}
+
+	/* invalidate current cache if UIDVALIDITY has been changed */
+	if (item->mtime != uid_validity) {
+		debug_print("imap_get_msg_list: "
+			    "UIDVALIDITY has been changed.\n");
+		use_cache = FALSE;
+	}
+
+	if (use_cache) {
+		GArray *uids;
+		GHashTable *msg_table;
+		GHashTable *flags_table;
+		guint32 cache_last;
+		guint32 begin = 0;
+		GSList *cur, *next = NULL;
+		MsgInfo *msginfo;
+		IMAPFlags imap_flags;
+
+		/* get cache data */
+		mlist = procmsg_read_cache(item, FALSE);
+		procmsg_set_flags(mlist, item);
+		cache_last = procmsg_get_last_num_in_msg_list(mlist);
+
+		/* get all UID list and flags */
+		ok = imap_search_flags(session, &uids, &flags_table);
+		if (ok != IMAP_SUCCESS) {
+			if (ok == IMAP_SOCKET || ok == IMAP_IOERR) THROW;
+			ok = imap_fetch_flags(session, &uids, &flags_table);
+			if (ok != IMAP_SUCCESS) THROW;
+		}
+
+		if (uids->len > 0) {
+			first_uid = g_array_index(uids, guint32, 0);
+			last_uid = g_array_index(uids, guint32, uids->len - 1);
+		} else {
+			g_array_free(uids, TRUE);
+			g_hash_table_destroy(flags_table);
+			THROW;
+		}
+
+		/* sync message flags with server */
+		for (cur = mlist; cur != NULL; cur = next) {
+			msginfo = (MsgInfo *)cur->data;
+			next = cur->next;
+			imap_flags = GPOINTER_TO_INT(g_hash_table_lookup
+				(flags_table,
+				 GUINT_TO_POINTER(msginfo->msgnum)));
+
+			if (imap_flags == 0) {
+				debug_print("imap_get_msg_list: "
+					    "message %u has been deleted.\n",
+					    msginfo->msgnum);
+				imap_delete_cached_message
+					(item, msginfo->msgnum);
+				if (MSG_IS_NEW(msginfo->flags))
+					item->new--;
+				if (MSG_IS_UNREAD(msginfo->flags))
+					item->unread--;
+				item->total--;
+				mlist = g_slist_remove(mlist, msginfo);
+				procmsg_msginfo_free(msginfo);
+				item->cache_dirty = TRUE;
+				item->mark_dirty = TRUE;
+				continue;
+			}
+
+			if (!IMAP_IS_SEEN(imap_flags)) {
+				if (!MSG_IS_UNREAD(msginfo->flags)) {
+					item->unread++;
+					MSG_SET_PERM_FLAGS(msginfo->flags,
+							   MSG_UNREAD);
+					item->mark_dirty = TRUE;
+				}
+			} else {
+				if (MSG_IS_NEW(msginfo->flags)) {
+					item->new--;
+					item->mark_dirty = TRUE;
+				}
+				if (MSG_IS_UNREAD(msginfo->flags)) {
+					item->unread--;
+					item->mark_dirty = TRUE;
+				}
+				MSG_UNSET_PERM_FLAGS(msginfo->flags,
+						     MSG_NEW|MSG_UNREAD);
+			}
+
+			if (IMAP_IS_FLAGGED(imap_flags)) {
+				if (!MSG_IS_MARKED(msginfo->flags)) {
+					MSG_SET_PERM_FLAGS(msginfo->flags,
+							   MSG_MARKED);
+					item->mark_dirty = TRUE;
+				}
+			} else {
+				if (MSG_IS_MARKED(msginfo->flags)) {
+					MSG_UNSET_PERM_FLAGS(msginfo->flags,
+							     MSG_MARKED);
+					item->mark_dirty = TRUE;
+				}
+			}
+			if (IMAP_IS_ANSWERED(imap_flags)) {
+				if (!MSG_IS_REPLIED(msginfo->flags)) {
+					MSG_SET_PERM_FLAGS(msginfo->flags,
+							   MSG_REPLIED);
+					item->mark_dirty = TRUE;
+				}
+			} else {
+				if (MSG_IS_REPLIED(msginfo->flags)) {
+					MSG_UNSET_PERM_FLAGS(msginfo->flags,
+							     MSG_REPLIED);
+					item->mark_dirty = TRUE;
+				}
+			}
+		}
+
+		/* check for the first new message */
+		msg_table = procmsg_msg_hash_table_create(mlist);
+		if (msg_table == NULL)
+			begin = first_uid;
+		else {
+			gint i;
+
+			for (i = 0; i < uids->len; i++) {
+				guint32 uid;
+
+				uid = g_array_index(uids, guint32, i);
+				if (g_hash_table_lookup
+					(msg_table, GUINT_TO_POINTER(uid))
+					== NULL) {
+					debug_print("imap_get_msg_list: "
+						    "first new UID: %u\n", uid);
+					begin = uid;
+					break;
+				}
+			}
+			g_hash_table_destroy(msg_table);
+		}
+
+		g_array_free(uids, TRUE);
+		g_hash_table_destroy(flags_table);
+
+		/* remove ununsed caches */
+		if (first_uid > 0 && last_uid > 0) {
+			mlist = imap_delete_cached_messages
+				(mlist, item, 0, first_uid - 1);
+			mlist = imap_delete_cached_messages
+				(mlist, item, begin > 0 ? begin : last_uid + 1,
+				 UINT_MAX);
+		}
+
+		if (begin > 0 && begin <= last_uid) {
+			GSList *newlist;
+			newlist = imap_get_uncached_messages(session, item,
+							     begin, last_uid,
+							     TRUE);
+			if (newlist)
+				item->cache_dirty = TRUE;
+			mlist = g_slist_concat(mlist, newlist);
+		}
+	} else {
+		imap_delete_all_cached_messages(item);
+		mlist = imap_get_uncached_messages(session, item, 0, 0, TRUE);
+		last_uid = procmsg_get_last_num_in_msg_list(mlist);
+		item->cache_dirty = TRUE;
+	}
+
+	item->mtime = uid_validity;
+
+	mlist = procmsg_sort_msg_list(mlist, item->sort_key, item->sort_type);
+
+	item->last_num = last_uid;
+
+	debug_print("cache_dirty: %d, mark_dirty: %d\n",
+		    item->cache_dirty, item->mark_dirty);
+
+catch:
+	return mlist;
+}
+
+#undef THROW
+
+static gchar *imap_fetch_msg(Folder *folder, FolderItem *item, gint uid)
+{
+	gchar *path, *filename;
+	IMAPSession *session;
+	gint ok;
+
+	g_return_val_if_fail(folder != NULL, NULL);
+	g_return_val_if_fail(item != NULL, NULL);
+
+	path = folder_item_get_path(item);
+	if (!is_dir_exist(path))
+		make_dir_hier(path);
+	filename = g_strconcat(path, G_DIR_SEPARATOR_S, itos(uid), NULL);
+	g_free(path);
+
+	if (is_file_exist(filename)) {
+		debug_print("message %d has been already cached.\n", uid);
+		return filename;
+	}
+
+	session = imap_session_get(folder);
+	if (!session) {
+		g_free(filename);
+		return NULL;
+	}
+
+	ok = imap_select(session, IMAP_FOLDER(folder), item->path,
+			 NULL, NULL, NULL, NULL);
+	if (ok != IMAP_SUCCESS) {
+		g_warning("can't select mailbox %s\n", item->path);
+		g_free(filename);
+		return NULL;
+	}
+
+	debug_print("getting message %d...\n", uid);
+	ok = imap_cmd_fetch(session, (guint32)uid, filename);
+
+	if (ok != IMAP_SUCCESS) {
+		g_warning("can't fetch message %d\n", uid);
+		g_free(filename);
+		return NULL;
+	}
+
+	return filename;
+}
+
+static MsgInfo *imap_get_msginfo(Folder *folder, FolderItem *item, gint uid)
+{
+	IMAPSession *session;
+	GSList *list;
+	MsgInfo *msginfo = NULL;
+
+	g_return_val_if_fail(folder != NULL, NULL);
+	g_return_val_if_fail(item != NULL, NULL);
+
+	session = imap_session_get(folder);
+	g_return_val_if_fail(session != NULL, NULL);
+
+	list = imap_get_uncached_messages(session, item, uid, uid, FALSE);
+	if (list) {
+		msginfo = (MsgInfo *)list->data;
+		list->data = NULL;
+	}
+	procmsg_msg_list_free(list);
+
+	return msginfo;
+}
+
+static gint imap_add_msg(Folder *folder, FolderItem *dest, const gchar *file,
+			 MsgFlags *flags, gboolean remove_source)
+{
+	GSList file_list;
+	MsgFileInfo fileinfo;
+
+	g_return_val_if_fail(file != NULL, -1);
+
+	fileinfo.file = (gchar *)file;
+	fileinfo.flags = flags;
+	file_list.data = &fileinfo;
+	file_list.next = NULL;
+
+	return imap_add_msgs(folder, dest, &file_list, remove_source, NULL);
+}
+
+static gint imap_add_msgs(Folder *folder, FolderItem *dest, GSList *file_list,
+			  gboolean remove_source, gint *first)
+{
+	gchar *destdir;
+	IMAPSession *session;
+	gint messages, recent, unseen;
+	guint32 uid_next, uid_validity;
+	guint32 last_uid = 0;
+	GSList *cur;
+	MsgFileInfo *fileinfo;
+	gint ok;
+
+	g_return_val_if_fail(folder != NULL, -1);
+	g_return_val_if_fail(dest != NULL, -1);
+	g_return_val_if_fail(file_list != NULL, -1);
+
+	session = imap_session_get(folder);
+	if (!session) return -1;
+
+	ok = imap_status(session, IMAP_FOLDER(folder), dest->path,
+			 &messages, &recent, &uid_next, &uid_validity, &unseen);
+	if (ok != IMAP_SUCCESS) {
+		g_warning("can't append messages\n");
+		return -1;
+	}
+
+	destdir = imap_get_real_path(IMAP_FOLDER(folder), dest->path);
+
+	if (!session->uidplus)
+		last_uid = uid_next - 1;
+	if (first)
+		*first = uid_next;
+
+	for (cur = file_list; cur != NULL; cur = cur->next) {
+		IMAPFlags iflags = 0;
+		guint32 new_uid = 0;
+
+		fileinfo = (MsgFileInfo *)cur->data;
+
+		if (fileinfo->flags) {
+			if (MSG_IS_MARKED(*fileinfo->flags))
+				iflags |= IMAP_FLAG_FLAGGED;
+			if (MSG_IS_REPLIED(*fileinfo->flags))
+				iflags |= IMAP_FLAG_ANSWERED;
+			if (!MSG_IS_UNREAD(*fileinfo->flags))
+				iflags |= IMAP_FLAG_SEEN;
+		}
+
+		if (dest->stype == F_OUTBOX ||
+		    dest->stype == F_QUEUE  ||
+		    dest->stype == F_DRAFT  ||
+		    dest->stype == F_TRASH)
+			iflags |= IMAP_FLAG_SEEN;
+
+		ok = imap_cmd_append(session, destdir, fileinfo->file, iflags,
+				     &new_uid);
+
+		if (ok != IMAP_SUCCESS) {
+			g_warning("can't append message %s\n", fileinfo->file);
+			g_free(destdir);
+			return -1;
+		}
+
+		if (!session->uidplus)
+			last_uid++;
+		else if (last_uid < new_uid)
+			last_uid = new_uid;
+
+		dest->last_num = last_uid;
+		dest->total++;
+		dest->updated = TRUE;
+
+		if (fileinfo->flags) {
+			if (MSG_IS_UNREAD(*fileinfo->flags))
+				dest->unread++;
+		} else
+			dest->unread++;
+	}
+
+	g_free(destdir);
+
+	if (remove_source) {
+		for (cur = file_list; cur != NULL; cur = cur->next) {
+			fileinfo = (MsgFileInfo *)cur->data;
+			if (g_unlink(fileinfo->file) < 0)
+				 FILE_OP_ERROR(fileinfo->file, "unlink");
+		}
+	}
+
+	return last_uid;
+}
+
+static gint imap_do_copy_msgs(Folder *folder, FolderItem *dest, GSList *msglist,
+			      gboolean remove_source)
+{
+	FolderItem *src;
+	gchar *destdir;
+	GSList *seq_list, *cur;
+	MsgInfo *msginfo;
+	IMAPSession *session;
+	gint ok = IMAP_SUCCESS;
+
+	g_return_val_if_fail(folder != NULL, -1);
+	g_return_val_if_fail(dest != NULL, -1);
+	g_return_val_if_fail(msglist != NULL, -1);
+
+	session = imap_session_get(folder);
+	if (!session) return -1;
+
+	msginfo = (MsgInfo *)msglist->data;
+
+	src = msginfo->folder;
+	if (src == dest) {
+		g_warning("the src folder is identical to the dest.\n");
+		return -1;
+	}
+
+	ok = imap_select(session, IMAP_FOLDER(folder), src->path,
+			 NULL, NULL, NULL, NULL);
+	if (ok != IMAP_SUCCESS)
+		return ok;
+
+	destdir = imap_get_real_path(IMAP_FOLDER(folder), dest->path);
+
+	seq_list = imap_get_seq_set_from_msglist(msglist);
+
+	for (cur = seq_list; cur != NULL; cur = cur->next) {
+		gchar *seq_set = (gchar *)cur->data;
+
+		if (remove_source)
+			debug_print("Moving message %s%c[%s] to %s ...\n",
+				    src->path, G_DIR_SEPARATOR,
+				    seq_set, destdir);
+		else
+			debug_print("Copying message %s%c[%s] to %s ...\n",
+				    src->path, G_DIR_SEPARATOR,
+				    seq_set, destdir);
+
+		ok = imap_cmd_copy(session, seq_set, destdir);
+		if (ok != IMAP_SUCCESS) {
+			imap_seq_set_free(seq_list);
+			return -1;
+		}
+	}
+
+	dest->updated = TRUE;
+
+	if (remove_source) {
+		imap_remove_msgs_by_seq_set(folder, src, seq_list);
+		if (ok != IMAP_SUCCESS) {
+			imap_seq_set_free(seq_list);
+			return ok;
+		}
+	}
+
+	imap_seq_set_free(seq_list);
+
+	for (cur = msglist; cur != NULL; cur = cur->next) {
+		msginfo = (MsgInfo *)cur->data;
+		dest->total++;
+		if (MSG_IS_NEW(msginfo->flags))
+			dest->new++;
+		if (MSG_IS_UNREAD(msginfo->flags))
+			dest->unread++;
+
+		if (remove_source) {
+			src->total--;
+			if (MSG_IS_NEW(msginfo->flags))
+				src->new--;
+			if (MSG_IS_UNREAD(msginfo->flags))
+				src->unread--;
+			MSG_SET_TMP_FLAGS(msginfo->flags, MSG_INVALID);
+		}
+	}
+
+	g_free(destdir);
+
+	if (ok == IMAP_SUCCESS)
+		return 0;
+	else
+		return -1;
+}
+
+static gint imap_move_msg(Folder *folder, FolderItem *dest, MsgInfo *msginfo)
+{
+	GSList msglist;
+
+	g_return_val_if_fail(msginfo != NULL, -1);
+
+	msglist.data = msginfo;
+	msglist.next = NULL;
+
+	return imap_move_msgs(folder, dest, &msglist);
+}
+
+static gint imap_move_msgs(Folder *folder, FolderItem *dest, GSList *msglist)
+{
+	MsgInfo *msginfo;
+	GSList *file_list;
+	gint ret = 0;
+
+	g_return_val_if_fail(folder != NULL, -1);
+	g_return_val_if_fail(dest != NULL, -1);
+	g_return_val_if_fail(msglist != NULL, -1);
+
+	msginfo = (MsgInfo *)msglist->data;
+	g_return_val_if_fail(msginfo->folder != NULL, -1);
+
+	if (folder == msginfo->folder->folder)
+		return imap_do_copy_msgs(folder, dest, msglist, TRUE);
+
+	file_list = procmsg_get_message_file_list(msglist);
+	g_return_val_if_fail(file_list != NULL, -1);
+
+	ret = imap_add_msgs(folder, dest, file_list, FALSE, NULL);
+
+	procmsg_message_file_list_free(file_list);
+
+	if (ret != -1)
+		ret = folder_item_remove_msgs(msginfo->folder, msglist);
+
+	return ret;
+}
+
+static gint imap_copy_msg(Folder *folder, FolderItem *dest, MsgInfo *msginfo)
+{
+	GSList msglist;
+
+	g_return_val_if_fail(msginfo != NULL, -1);
+
+	msglist.data = msginfo;
+	msglist.next = NULL;
+
+	return imap_copy_msgs(folder, dest, &msglist);
+}
+
+static gint imap_copy_msgs(Folder *folder, FolderItem *dest, GSList *msglist)
+{
+	MsgInfo *msginfo;
+	GSList *file_list;
+	gint ret;
+
+	g_return_val_if_fail(folder != NULL, -1);
+	g_return_val_if_fail(dest != NULL, -1);
+	g_return_val_if_fail(msglist != NULL, -1);
+
+	msginfo = (MsgInfo *)msglist->data;
+	g_return_val_if_fail(msginfo->folder != NULL, -1);
+
+	if (folder == msginfo->folder->folder)
+		return imap_do_copy_msgs(folder, dest, msglist, FALSE);
+
+	file_list = procmsg_get_message_file_list(msglist);
+	g_return_val_if_fail(file_list != NULL, -1);
+
+	ret = imap_add_msgs(folder, dest, file_list, FALSE, NULL);
+
+	procmsg_message_file_list_free(file_list);
+
+	return ret;
+}
+
+static gint imap_remove_msgs_by_seq_set(Folder *folder, FolderItem *item,
+					GSList *seq_list)
+{
+	gint ok;
+	IMAPSession *session;
+	GSList *cur;
+
+	g_return_val_if_fail(seq_list != NULL, -1);
+
+	session = imap_session_get(folder);
+	if (!session) return -1;
+
+	for (cur = seq_list; cur != NULL; cur = cur->next) {
+		gchar *seq_set = (gchar *)cur->data;
+
+		ok = imap_set_message_flags(session, seq_set, IMAP_FLAG_DELETED,
+					    TRUE);
+		if (ok != IMAP_SUCCESS) {
+			log_warning(_("can't set deleted flags: %s\n"),
+				    seq_set);
+			return ok;
+		}
+	}
+
+	ok = imap_cmd_expunge(session);
+	if (ok != IMAP_SUCCESS)
+		log_warning(_("can't expunge\n"));
+
+	item->updated = TRUE;
+
+	return ok;
+}
+
+static gint imap_remove_msg(Folder *folder, FolderItem *item, MsgInfo *msginfo)
+{
+	GSList msglist;
+
+	g_return_val_if_fail(msginfo != NULL, -1);
+
+	msglist.data = msginfo;
+	msglist.next = NULL;
+
+	return imap_remove_msgs(folder, item, &msglist);
+}
+
+static gint imap_remove_msgs(Folder *folder, FolderItem *item, GSList *msglist)
+{
+	gint ok;
+	IMAPSession *session;
+	GSList *seq_list, *cur;
+	gchar *dir;
+	gboolean dir_exist;
+
+	g_return_val_if_fail(folder != NULL, -1);
+	g_return_val_if_fail(FOLDER_TYPE(folder) == F_IMAP, -1);
+	g_return_val_if_fail(item != NULL, -1);
+	g_return_val_if_fail(msglist != NULL, -1);
+
+	session = imap_session_get(folder);
+	if (!session) return -1;
+
+	ok = imap_select(session, IMAP_FOLDER(folder), item->path,
+			 NULL, NULL, NULL, NULL);
+	if (ok != IMAP_SUCCESS)
+		return ok;
+
+	seq_list = imap_get_seq_set_from_msglist(msglist);
+	ok = imap_remove_msgs_by_seq_set(folder, item, seq_list);
+	imap_seq_set_free(seq_list);
+	if (ok != IMAP_SUCCESS)
+		return ok;
+
+	dir = folder_item_get_path(item);
+	dir_exist = is_dir_exist(dir);
+	for (cur = msglist; cur != NULL; cur = cur->next) {
+		MsgInfo *msginfo = (MsgInfo *)cur->data;
+		guint32 uid = msginfo->msgnum;
+
+		if (dir_exist)
+			remove_numbered_files(dir, uid, uid);
+		item->total--;
+		if (MSG_IS_NEW(msginfo->flags))
+			item->new--;
+		if (MSG_IS_UNREAD(msginfo->flags))
+			item->unread--;
+		MSG_SET_TMP_FLAGS(msginfo->flags, MSG_INVALID);
+	}
+	g_free(dir);
+
+	return IMAP_SUCCESS;
+}
+
+static gint imap_remove_all_msg(Folder *folder, FolderItem *item)
+{
+	gint ok;
+	IMAPSession *session;
+	gchar *dir;
+
+	g_return_val_if_fail(folder != NULL, -1);
+	g_return_val_if_fail(item != NULL, -1);
+
+	session = imap_session_get(folder);
+	if (!session) return -1;
+
+	ok = imap_select(session, IMAP_FOLDER(folder), item->path,
+			 NULL, NULL, NULL, NULL);
+	if (ok != IMAP_SUCCESS)
+		return ok;
+
+	imap_cmd_gen_send(session, "STORE 1:* +FLAGS.SILENT (\\Deleted)");
+	ok = imap_cmd_ok(session, NULL);
+	if (ok != IMAP_SUCCESS) {
+		log_warning(_("can't set deleted flags: 1:*\n"));
+		return ok;
+	}
+
+	ok = imap_cmd_expunge(session);
+	if (ok != IMAP_SUCCESS) {
+		log_warning(_("can't expunge\n"));
+		return ok;
+	}
+
+	item->new = item->unread = item->total = 0;
+	item->updated = TRUE;
+
+	dir = folder_item_get_path(item);
+	if (is_dir_exist(dir))
+		remove_all_numbered_files(dir);
+	g_free(dir);
+
+	return IMAP_SUCCESS;
+}
+
+static gboolean imap_is_msg_changed(Folder *folder, FolderItem *item,
+				    MsgInfo *msginfo)
+{
+	/* TODO: properly implement this method */
+	return FALSE;
+}
+
+static gint imap_close(Folder *folder, FolderItem *item)
+{
+	gint ok;
+	IMAPSession *session;
+
+	g_return_val_if_fail(folder != NULL, -1);
+
+	if (!item->path) return 0;
+
+	session = imap_session_get(folder);
+	if (!session) return -1;
+
+	if (session->mbox) {
+		if (strcmp2(session->mbox, item->path) != 0) return -1;
+
+		ok = imap_cmd_close(session);
+		if (ok != IMAP_SUCCESS)
+			log_warning(_("can't close folder\n"));
+
+		g_free(session->mbox);
+		session->mbox = NULL;
+
+		return ok;
+	} else
+		return 0;
+}
+
+static gint imap_scan_folder(Folder *folder, FolderItem *item)
+{
+	IMAPSession *session;
+	gint messages, recent, unseen;
+	guint32 uid_next, uid_validity;
+	gint ok;
+
+	g_return_val_if_fail(folder != NULL, -1);
+	g_return_val_if_fail(item != NULL, -1);
+
+	session = imap_session_get(folder);
+	if (!session) return -1;
+
+	ok = imap_status(session, IMAP_FOLDER(folder), item->path,
+			 &messages, &recent, &uid_next, &uid_validity, &unseen);
+	if (ok != IMAP_SUCCESS) return -1;
+
+	item->new = unseen > 0 ? recent : 0;
+	item->unread = unseen;
+	item->total = messages;
+	item->last_num = (messages > 0 && uid_next > 0) ? uid_next - 1 : 0;
+	/* item->mtime = uid_validity; */
+	item->updated = TRUE;
+
+	return 0;
+}
+
+static gint imap_scan_tree(Folder *folder)
+{
+	FolderItem *item = NULL;
+	IMAPSession *session;
+	gchar *root_folder = NULL;
+
+	g_return_val_if_fail(folder != NULL, -1);
+	g_return_val_if_fail(folder->account != NULL, -1);
+
+	session = imap_session_get(folder);
+	if (!session) {
+		if (!folder->node) {
+			folder_tree_destroy(folder);
+			item = folder_item_new(folder->name, NULL);
+			item->folder = folder;
+			folder->node = item->node = g_node_new(item);
+		}
+		return -1;
+	}
+
+	if (folder->account->imap_dir && *folder->account->imap_dir) {
+		gchar *real_path;
+		GPtrArray *argbuf;
+		gint ok;
+
+		Xstrdup_a(root_folder, folder->account->imap_dir, return -1);
+		extract_quote(root_folder, '"');
+		subst_char(root_folder,
+			   imap_get_path_separator(IMAP_FOLDER(folder),
+						   root_folder),
+			   '/');
+		strtailchomp(root_folder, '/');
+		real_path = imap_get_real_path
+			(IMAP_FOLDER(folder), root_folder);
+		debug_print("IMAP root directory: %s\n", real_path);
+
+		/* check if root directory exist */
+		argbuf = g_ptr_array_new();
+		ok = imap_cmd_list(session, NULL, real_path, argbuf);
+		if (ok != IMAP_SUCCESS ||
+		    search_array_str(argbuf, "LIST ") == NULL) {
+			log_warning(_("root folder %s not exist\n"), real_path);
+			g_ptr_array_free(argbuf, TRUE);
+			g_free(real_path);
+			return -1;
+		}
+		g_ptr_array_free(argbuf, TRUE);
+		g_free(real_path);
+	}
+
+	if (folder->node)
+		item = FOLDER_ITEM(folder->node->data);
+	if (!item || ((item->path || root_folder) &&
+		      strcmp2(item->path, root_folder) != 0)) {
+		folder_tree_destroy(folder);
+		item = folder_item_new(folder->name, root_folder);
+		item->folder = folder;
+		folder->node = item->node = g_node_new(item);
+	}
+
+	imap_scan_tree_recursive(session, FOLDER_ITEM(folder->node->data));
+	imap_create_missing_folders(folder);
+
+	return 0;
+}
+
+static gint imap_scan_tree_recursive(IMAPSession *session, FolderItem *item)
+{
+	Folder *folder;
+	IMAPFolder *imapfolder;
+	FolderItem *new_item;
+	GSList *item_list, *cur;
+	GNode *node;
+	gchar *real_path;
+	gchar *wildcard_path;
+	gchar separator;
+	gchar wildcard[3];
+
+	g_return_val_if_fail(item != NULL, -1);
+	g_return_val_if_fail(item->folder != NULL, -1);
+	g_return_val_if_fail(item->no_sub == FALSE, -1);
+
+	folder = item->folder;
+	imapfolder = IMAP_FOLDER(folder);
+
+	separator = imap_get_path_separator(imapfolder, item->path);
+
+	if (folder->ui_func)
+		folder->ui_func(folder, item, folder->ui_func_data);
+
+	if (item->path) {
+		wildcard[0] = separator;
+		wildcard[1] = '%';
+		wildcard[2] = '\0';
+		real_path = imap_get_real_path(imapfolder, item->path);
+	} else {
+		wildcard[0] = '%';
+		wildcard[1] = '\0';
+		real_path = g_strdup("");
+	}
+
+	Xstrcat_a(wildcard_path, real_path, wildcard,
+		  {g_free(real_path); return IMAP_ERROR;});
+	QUOTE_IF_REQUIRED(wildcard_path, wildcard_path);
+
+	imap_cmd_gen_send(session, "LIST \"\" %s", wildcard_path);
+
+	strtailchomp(real_path, separator);
+	item_list = imap_parse_list(session, real_path, NULL);
+	g_free(real_path);
+
+	node = item->node->children;
+	while (node != NULL) {
+		FolderItem *old_item = FOLDER_ITEM(node->data);
+		GNode *next = node->next;
+
+		new_item = NULL;
+
+		for (cur = item_list; cur != NULL; cur = cur->next) {
+			FolderItem *cur_item = FOLDER_ITEM(cur->data);
+			if (!strcmp2(old_item->path, cur_item->path)) {
+				new_item = cur_item;
+				break;
+			}
+		}
+		if (!new_item) {
+			debug_print("folder '%s' not found. removing...\n",
+				    old_item->path);
+			folder_item_remove(old_item);
+		} else {
+			old_item->no_sub = new_item->no_sub;
+			old_item->no_select = new_item->no_select;
+			if (old_item->no_select == TRUE)
+				old_item->new = old_item->unread =
+					old_item->total = 0;
+			if (old_item->no_sub == TRUE && node->children) {
+				debug_print("folder '%s' doesn't have "
+					    "subfolders. removing...\n",
+					    old_item->path);
+				folder_item_remove_children(old_item);
+			}
+		}
+
+		node = next;
+	}
+
+	for (cur = item_list; cur != NULL; cur = cur->next) {
+		FolderItem *cur_item = FOLDER_ITEM(cur->data);
+		new_item = NULL;
+		for (node = item->node->children; node != NULL;
+		     node = node->next) {
+			if (!strcmp2(FOLDER_ITEM(node->data)->path,
+				     cur_item->path)) {
+				new_item = FOLDER_ITEM(node->data);
+				folder_item_destroy(cur_item);
+				cur_item = NULL;
+				break;
+			}
+		}
+		if (!new_item) {
+			new_item = cur_item;
+			debug_print("new folder '%s' found.\n", new_item->path);
+			folder_item_append(item, new_item);
+		}
+
+		if (!strcmp(new_item->path, "INBOX")) {
+			new_item->stype = F_INBOX;
+			folder->inbox = new_item;
+		} else if (!item->parent || item->stype == F_INBOX) {
+			const gchar *base;
+
+			base = g_basename(new_item->path);
+
+			if (!folder->outbox &&
+			    !g_ascii_strcasecmp(base, "Sent")) {
+				new_item->stype = F_OUTBOX;
+				folder->outbox = new_item;
+			} else if (!folder->draft &&
+				   !g_ascii_strcasecmp(base, "Drafts")) {
+				new_item->stype = F_DRAFT;
+				folder->draft = new_item;
+			} else if (!folder->queue &&
+				   !g_ascii_strcasecmp(base, "Queue")) {
+				new_item->stype = F_QUEUE;
+				folder->queue = new_item;
+			} else if (!folder->trash &&
+				   !g_ascii_strcasecmp(base, "Trash")) {
+				new_item->stype = F_TRASH;
+				folder->trash = new_item;
+			}
+		}
+
+#if 0
+		if (new_item->no_select == FALSE)
+			imap_scan_folder(folder, new_item);
+#endif
+		if (new_item->no_sub == FALSE)
+			imap_scan_tree_recursive(session, new_item);
+	}
+
+	g_slist_free(item_list);
+
+	return IMAP_SUCCESS;
+}
+
+static GSList *imap_parse_list(IMAPSession *session, const gchar *real_path,
+			       gchar *separator)
+{
+	gchar buf[IMAPBUFSIZE];
+	gchar flags[256];
+	gchar separator_str[16];
+	gchar *p;
+	const gchar *name;
+	gchar *loc_name, *loc_path;
+	GSList *item_list = NULL;
+	GString *str;
+	FolderItem *new_item;
+
+	debug_print("getting list of %s ...\n",
+		    *real_path ? real_path : "\"\"");
+
+	str = g_string_new(NULL);
+
+	for (;;) {
+		if (sock_gets(SESSION(session)->sock, buf, sizeof(buf)) <= 0) {
+			log_warning(_("error occurred while getting LIST.\n"));
+			break;
+		}
+		strretchomp(buf);
+		if (buf[0] != '*' || buf[1] != ' ') {
+			log_print("IMAP4< %s\n", buf);
+			if (sscanf(buf, "%*d %16s", buf) < 1 ||
+			    strcmp(buf, "OK") != 0)
+				log_warning(_("error occurred while getting LIST.\n"));
+				
+			break;
+		}
+		debug_print("IMAP4< %s\n", buf);
+
+		g_string_assign(str, buf);
+		p = str->str + 2;
+		if (strncmp(p, "LIST ", 5) != 0) continue;
+		p += 5;
+
+		if (*p != '(') continue;
+		p++;
+		p = strchr_cpy(p, ')', flags, sizeof(flags));
+		if (!p) continue;
+		while (*p == ' ') p++;
+
+		p = strchr_cpy(p, ' ', separator_str, sizeof(separator_str));
+		if (!p) continue;
+		extract_quote(separator_str, '"');
+		if (!strcmp(separator_str, "NIL"))
+			separator_str[0] = '\0';
+		if (separator)
+			*separator = separator_str[0];
+
+		buf[0] = '\0';
+		while (*p == ' ') p++;
+		if (*p == '{' || *p == '"')
+			p = imap_parse_atom(session, p, buf, sizeof(buf), str);
+		else
+			strncpy2(buf, p, sizeof(buf));
+		strtailchomp(buf, separator_str[0]);
+		if (buf[0] == '\0') continue;
+		if (!strcmp(buf, real_path)) continue;
+
+		if (separator_str[0] != '\0')
+			subst_char(buf, separator_str[0], '/');
+		name = g_basename(buf);
+		if (name[0] == '.') continue;
+
+		loc_name = imap_modified_utf7_to_utf8(name);
+		loc_path = imap_modified_utf7_to_utf8(buf);
+		new_item = folder_item_new(loc_name, loc_path);
+		if (strcasestr(flags, "\\Noinferiors") != NULL)
+			new_item->no_sub = TRUE;
+		if (strcmp(buf, "INBOX") != 0 &&
+		    strcasestr(flags, "\\Noselect") != NULL)
+			new_item->no_select = TRUE;
+
+		item_list = g_slist_append(item_list, new_item);
+
+		debug_print("folder '%s' found.\n", loc_path);
+		g_free(loc_path);
+		g_free(loc_name);
+	}
+
+	g_string_free(str, TRUE);
+
+	return item_list;
+}
+
+static gint imap_create_tree(Folder *folder)
+{
+	g_return_val_if_fail(folder != NULL, -1);
+	g_return_val_if_fail(folder->node != NULL, -1);
+	g_return_val_if_fail(folder->node->data != NULL, -1);
+	g_return_val_if_fail(folder->account != NULL, -1);
+
+	imap_scan_tree(folder);
+	imap_create_missing_folders(folder);
+
+	return 0;
+}
+
+static void imap_create_missing_folders(Folder *folder)
+{
+	g_return_if_fail(folder != NULL);
+
+	if (!folder->inbox)
+		folder->inbox = imap_create_special_folder
+			(folder, F_INBOX, "INBOX");
+#if 0
+	if (!folder->outbox)
+		folder->outbox = imap_create_special_folder
+			(folder, F_OUTBOX, "Sent");
+	if (!folder->draft)
+		folder->draft = imap_create_special_folder
+			(folder, F_DRAFT, "Drafts");
+	if (!folder->queue)
+		folder->queue = imap_create_special_folder
+			(folder, F_QUEUE, "Queue");
+#endif
+	if (!folder->trash)
+		folder->trash = imap_create_special_folder
+			(folder, F_TRASH, "Trash");
+}
+
+static FolderItem *imap_create_special_folder(Folder *folder,
+					      SpecialFolderItemType stype,
+					      const gchar *name)
+{
+	FolderItem *item;
+	FolderItem *new_item;
+
+	g_return_val_if_fail(folder != NULL, NULL);
+	g_return_val_if_fail(folder->node != NULL, NULL);
+	g_return_val_if_fail(folder->node->data != NULL, NULL);
+	g_return_val_if_fail(folder->account != NULL, NULL);
+	g_return_val_if_fail(name != NULL, NULL);
+
+	item = FOLDER_ITEM(folder->node->data);
+	new_item = imap_create_folder(folder, item, name);
+
+	if (!new_item) {
+		g_warning(_("Can't create '%s'\n"), name);
+		if (!folder->inbox) return NULL;
+
+		new_item = imap_create_folder(folder, folder->inbox, name);
+		if (!new_item)
+			g_warning(_("Can't create '%s' under INBOX\n"), name);
+		else
+			new_item->stype = stype;
+	} else
+		new_item->stype = stype;
+
+	return new_item;
+}
+
+static FolderItem *imap_create_folder(Folder *folder, FolderItem *parent,
+				      const gchar *name)
+{
+	gchar *dirpath, *imap_path;
+	IMAPSession *session;
+	FolderItem *new_item;
+	gchar separator;
+	gchar *new_name;
+	const gchar *p;
+	gint ok;
+
+	g_return_val_if_fail(folder != NULL, NULL);
+	g_return_val_if_fail(folder->account != NULL, NULL);
+	g_return_val_if_fail(parent != NULL, NULL);
+	g_return_val_if_fail(name != NULL, NULL);
+
+	session = imap_session_get(folder);
+	if (!session) return NULL;
+
+	if (!parent->parent && strcmp(name, "INBOX") == 0)
+		dirpath = g_strdup(name);
+	else if (parent->path)
+		dirpath = g_strconcat(parent->path, "/", name, NULL);
+	else if ((p = strchr(name, '/')) != NULL && *(p + 1) != '\0')
+		dirpath = g_strdup(name);
+	else if (folder->account->imap_dir && *folder->account->imap_dir) {
+		gchar *imap_dir;
+
+		Xstrdup_a(imap_dir, folder->account->imap_dir, return NULL);
+		strtailchomp(imap_dir, '/');
+		dirpath = g_strconcat(imap_dir, "/", name, NULL);
+	} else
+		dirpath = g_strdup(name);
+
+	/* keep trailing directory separator to create a folder that contains
+	   sub folder */
+	imap_path = imap_utf8_to_modified_utf7(dirpath);
+	strtailchomp(dirpath, '/');
+	Xstrdup_a(new_name, name, {g_free(dirpath); return NULL;});
+	strtailchomp(new_name, '/');
+	separator = imap_get_path_separator(IMAP_FOLDER(folder), imap_path);
+	imap_path_separator_subst(imap_path, separator);
+	subst_char(new_name, '/', separator);
+
+	if (strcmp(name, "INBOX") != 0) {
+		GPtrArray *argbuf;
+		gint i;
+		gboolean exist = FALSE;
+
+		argbuf = g_ptr_array_new();
+		ok = imap_cmd_list(session, NULL, imap_path, argbuf);
+		if (ok != IMAP_SUCCESS) {
+			log_warning(_("can't create mailbox: LIST failed\n"));
+			g_free(imap_path);
+			g_free(dirpath);
+			g_ptr_array_free(argbuf, TRUE);
+			return NULL;
+		}
+
+		for (i = 0; i < argbuf->len; i++) {
+			gchar *str;
+			str = g_ptr_array_index(argbuf, i);
+			if (!strncmp(str, "LIST ", 5)) {
+				exist = TRUE;
+				break;
+			}
+		}
+		g_ptr_array_free(argbuf, TRUE);
+
+		if (!exist) {
+			ok = imap_cmd_create(session, imap_path);
+			if (ok != IMAP_SUCCESS) {
+				log_warning(_("can't create mailbox\n"));
+				g_free(imap_path);
+				g_free(dirpath);
+				return NULL;
+			}
+		}
+	}
+
+	new_item = folder_item_new(new_name, dirpath);
+	folder_item_append(parent, new_item);
+	g_free(imap_path);
+	g_free(dirpath);
+
+	dirpath = folder_item_get_path(new_item);
+	if (!is_dir_exist(dirpath))
+		make_dir_hier(dirpath);
+	g_free(dirpath);
+
+	return new_item;
+}
+
+static gint imap_rename_folder_real(Folder *folder, FolderItem *item,
+				    FolderItem *new_parent, const gchar *name)
+{
+	gchar *newpath;
+	gchar *real_oldpath;
+	gchar *real_newpath;
+	gchar *paths[2];
+	gchar *old_cache_dir;
+	gchar *new_cache_dir;
+	IMAPSession *session;
+	gchar separator;
+	gint ok;
+	gint exists, recent, unseen;
+	guint32 uid_validity;
+
+	g_return_val_if_fail(folder != NULL, -1);
+	g_return_val_if_fail(item != NULL, -1);
+	g_return_val_if_fail(folder == item->folder, -1);
+	g_return_val_if_fail(item->path != NULL, -1);
+	g_return_val_if_fail(new_parent != NULL || name != NULL, -1);
+	if (new_parent) {
+		g_return_val_if_fail(item != new_parent, -1);
+		g_return_val_if_fail(item->parent != new_parent, -1);
+		g_return_val_if_fail(item->folder == new_parent->folder, -1);
+		if (g_node_is_ancestor(item->node, new_parent->node)) {
+			g_warning("folder to be moved is ancestor of new parent\n");
+			return -1;
+		}
+	}
+
+	session = imap_session_get(folder);
+	if (!session) return -1;
+
+	real_oldpath = imap_get_real_path(IMAP_FOLDER(folder), item->path);
+
+	g_free(session->mbox);
+	session->mbox = NULL;
+	ok = imap_cmd_examine(session, "INBOX",
+			      &exists, &recent, &unseen, &uid_validity);
+	if (ok != IMAP_SUCCESS) {
+		g_free(real_oldpath);
+		return -1;
+	}
+
+	separator = imap_get_path_separator(IMAP_FOLDER(folder), item->path);
+	if (new_parent) {
+		if (name) {
+			newpath = g_strconcat(new_parent->path,
+					      G_DIR_SEPARATOR_S, name, NULL);
+		} else {
+			gchar *name_;
+
+			name_ = g_path_get_basename(item->path);
+			newpath = g_strconcat(new_parent->path,
+					      G_DIR_SEPARATOR_S, name_, NULL);
+			AUTORELEASE_STR(name_, );
+			name = name_;
+		}
+	} else {
+		if (strchr(item->path, G_DIR_SEPARATOR)) {
+			gchar *dirpath;
+
+			dirpath = g_dirname(item->path);
+			newpath = g_strconcat(dirpath, G_DIR_SEPARATOR_S, name,
+					      NULL);
+			g_free(dirpath);
+		} else
+			newpath = g_strdup(name);
+	}
+
+	real_newpath = imap_utf8_to_modified_utf7(newpath);
+	imap_path_separator_subst(real_newpath, separator);
+
+	ok = imap_cmd_rename(session, real_oldpath, real_newpath);
+	if (ok != IMAP_SUCCESS) {
+		log_warning(_("can't rename mailbox: %s to %s\n"),
+			    real_oldpath, real_newpath);
+		g_free(real_oldpath);
+		g_free(newpath);
+		g_free(real_newpath);
+		return -1;
+	}
+
+	if (new_parent) {
+		g_node_unlink(item->node);
+		g_node_append(new_parent->node, item->node);
+		item->parent = new_parent;
+	}
+
+	g_free(item->name);
+	item->name = g_strdup(name);
+
+	old_cache_dir = folder_item_get_path(item);
+
+	paths[0] = g_strdup(item->path);
+	paths[1] = newpath;
+	g_node_traverse(item->node, G_PRE_ORDER, G_TRAVERSE_ALL, -1,
+			imap_rename_folder_func, paths);
+
+	if (is_dir_exist(old_cache_dir)) {
+		new_cache_dir = folder_item_get_path(item);
+		if (g_rename(old_cache_dir, new_cache_dir) < 0) {
+			FILE_OP_ERROR(old_cache_dir, "rename");
+		}
+		g_free(new_cache_dir);
+	}
+
+	g_free(old_cache_dir);
+	g_free(paths[0]);
+	g_free(newpath);
+	g_free(real_oldpath);
+	g_free(real_newpath);
+
+	return 0;
+}
+
+static gint imap_rename_folder(Folder *folder, FolderItem *item,
+			       const gchar *name)
+{
+	return imap_rename_folder_real(folder, item, NULL, name);
+}
+
+static gint imap_move_folder(Folder *folder, FolderItem *item,
+			     FolderItem *new_parent)
+{
+	return imap_rename_folder_real(folder, item, new_parent, NULL);
+}
+
+static gint imap_remove_folder(Folder *folder, FolderItem *item)
+{
+	gint ok;
+	IMAPSession *session;
+	gchar *path;
+	gchar *cache_dir;
+	gint exists, recent, unseen;
+	guint32 uid_validity;
+
+	g_return_val_if_fail(folder != NULL, -1);
+	g_return_val_if_fail(item != NULL, -1);
+	g_return_val_if_fail(item->path != NULL, -1);
+
+	session = imap_session_get(folder);
+	if (!session) return -1;
+
+	path = imap_get_real_path(IMAP_FOLDER(folder), item->path);
+
+	ok = imap_cmd_examine(session, "INBOX",
+			      &exists, &recent, &unseen, &uid_validity);
+	if (ok != IMAP_SUCCESS) {
+		g_free(path);
+		return -1;
+	}
+
+	ok = imap_cmd_delete(session, path);
+	if (ok != IMAP_SUCCESS) {
+		log_warning(_("can't delete mailbox\n"));
+		g_free(path);
+		return -1;
+	}
+
+	g_free(path);
+	cache_dir = folder_item_get_path(item);
+	if (is_dir_exist(cache_dir) && remove_dir_recursive(cache_dir) < 0)
+		g_warning("can't remove directory '%s'\n", cache_dir);
+	g_free(cache_dir);
+	folder_item_remove(item);
+
+	return 0;
+}
+
+static GSList *imap_get_uncached_messages(IMAPSession *session,
+					  FolderItem *item,
+					  guint32 first_uid, guint32 last_uid,
+					  gboolean update_count)
+{
+	gchar *tmp;
+	GSList *newlist = NULL;
+	GSList *llast = NULL;
+	GString *str;
+	MsgInfo *msginfo;
+	gchar seq_set[22];
+
+	g_return_val_if_fail(session != NULL, NULL);
+	g_return_val_if_fail(item != NULL, NULL);
+	g_return_val_if_fail(item->folder != NULL, NULL);
+	g_return_val_if_fail(FOLDER_TYPE(item->folder) == F_IMAP, NULL);
+	g_return_val_if_fail(first_uid <= last_uid, NULL);
+
+	if (first_uid == 0 && last_uid == 0)
+		strcpy(seq_set, "1:*");
+	else
+		g_snprintf(seq_set, sizeof(seq_set), "%u:%u",
+			   first_uid, last_uid);
+	if (imap_cmd_envelope(session, seq_set) != IMAP_SUCCESS) {
+		log_warning(_("can't get envelope\n"));
+		return NULL;
+	}
+
+	str = g_string_new(NULL);
+
+	for (;;) {
+		if (sock_getline(SESSION(session)->sock, &tmp) < 0) {
+			log_warning(_("error occurred while getting envelope.\n"));
+			g_string_free(str, TRUE);
+			return newlist;
+		}
+		strretchomp(tmp);
+		if (tmp[0] != '*' || tmp[1] != ' ') {
+			log_print("IMAP4< %s\n", tmp);
+			g_free(tmp);
+			break;
+		}
+		if (strstr(tmp, "FETCH") == NULL) {
+			log_print("IMAP4< %s\n", tmp);
+			g_free(tmp);
+			continue;
+		}
+		log_print("IMAP4< %s\n", tmp);
+		g_string_assign(str, tmp);
+		g_free(tmp);
+
+		msginfo = imap_parse_envelope(session, item, str);
+		if (!msginfo) {
+			log_warning(_("can't parse envelope: %s\n"), str->str);
+			continue;
+		}
+		if (update_count) {
+			if (MSG_IS_NEW(msginfo->flags))
+				item->new++;
+			if (MSG_IS_UNREAD(msginfo->flags))
+				item->unread++;
+		}
+		if (item->stype == F_QUEUE) {
+			MSG_SET_TMP_FLAGS(msginfo->flags, MSG_QUEUED);
+		} else if (item->stype == F_DRAFT) {
+			MSG_SET_TMP_FLAGS(msginfo->flags, MSG_DRAFT);
+		}
+
+		msginfo->folder = item;
+
+		if (!newlist)
+			llast = newlist = g_slist_append(newlist, msginfo);
+		else {
+			llast = g_slist_append(llast, msginfo);
+			llast = llast->next;
+		}
+
+		if (update_count)
+			item->total++;
+	}
+
+	g_string_free(str, TRUE);
+
+	session_set_access_time(SESSION(session));
+
+	return newlist;
+}
+
+static void imap_delete_cached_message(FolderItem *item, guint32 uid)
+{
+	gchar *dir;
+	gchar *file;
+
+	g_return_if_fail(item != NULL);
+	g_return_if_fail(item->folder != NULL);
+	g_return_if_fail(FOLDER_TYPE(item->folder) == F_IMAP);
+
+	dir = folder_item_get_path(item);
+	file = g_strdup_printf("%s%c%u", dir, G_DIR_SEPARATOR, uid);
+
+	debug_print("Deleting cached message: %s\n", file);
+
+	g_unlink(file);
+
+	g_free(file);
+	g_free(dir);
+}
+
+static GSList *imap_delete_cached_messages(GSList *mlist, FolderItem *item,
+					   guint32 first_uid, guint32 last_uid)
+{
+	GSList *cur, *next;
+	MsgInfo *msginfo;
+	gchar *dir;
+
+	g_return_val_if_fail(item != NULL, mlist);
+	g_return_val_if_fail(item->folder != NULL, mlist);
+	g_return_val_if_fail(FOLDER_TYPE(item->folder) == F_IMAP, mlist);
+
+	if (first_uid == 0 && last_uid == 0)
+		return mlist;
+
+	debug_print("Deleting cached messages %u - %u ... ",
+		    first_uid, last_uid);
+
+	dir = folder_item_get_path(item);
+	if (is_dir_exist(dir))
+		remove_numbered_files(dir, first_uid, last_uid);
+	g_free(dir);
+
+	for (cur = mlist; cur != NULL; ) {
+		next = cur->next;
+
+		msginfo = (MsgInfo *)cur->data;
+		if (msginfo != NULL && first_uid <= msginfo->msgnum &&
+		    msginfo->msgnum <= last_uid) {
+			procmsg_msginfo_free(msginfo);
+			mlist = g_slist_remove(mlist, msginfo);
+		}
+
+		cur = next;
+	}
+
+	debug_print("done.\n");
+
+	return mlist;
+}
+
+static void imap_delete_all_cached_messages(FolderItem *item)
+{
+	gchar *dir;
+
+	g_return_if_fail(item != NULL);
+	g_return_if_fail(item->folder != NULL);
+	g_return_if_fail(FOLDER_TYPE(item->folder) == F_IMAP);
+
+	debug_print("Deleting all cached messages... ");
+
+	dir = folder_item_get_path(item);
+	if (is_dir_exist(dir))
+		remove_all_numbered_files(dir);
+	g_free(dir);
+
+	debug_print("done.\n");
+}
+
+#if USE_SSL
+static SockInfo *imap_open(const gchar *server, gushort port,
+			   SSLType ssl_type)
+#else
+static SockInfo *imap_open(const gchar *server, gushort port)
+#endif
+{
+	SockInfo *sock;
+
+	if ((sock = sock_connect(server, port)) == NULL) {
+		log_warning(_("Can't connect to IMAP4 server: %s:%d\n"),
+			    server, port);
+		return NULL;
+	}
+
+#if USE_SSL
+	if (ssl_type == SSL_TUNNEL && !ssl_init_socket(sock)) {
+		log_warning(_("Can't establish IMAP4 session with: %s:%d\n"),
+			    server, port);
+		sock_close(sock);
+		return NULL;
+	}
+#endif
+
+	return sock;
+}
+
+static GList *imap_parse_namespace_str(gchar *str)
+{
+	guchar *p = str;
+	gchar *name;
+	gchar *separator;
+	IMAPNameSpace *namespace;
+	GList *ns_list = NULL;
+
+	while (*p != '\0') {
+		/* parse ("#foo" "/") */
+
+		while (*p && *p != '(') p++;
+		if (*p == '\0') break;
+		p++;
+
+		while (*p && *p != '"') p++;
+		if (*p == '\0') break;
+		p++;
+		name = p;
+
+		while (*p && *p != '"') p++;
+		if (*p == '\0') break;
+		*p = '\0';
+		p++;
+
+		while (*p && g_ascii_isspace(*p)) p++;
+		if (*p == '\0') break;
+		if (strncmp(p, "NIL", 3) == 0)
+			separator = NULL;
+		else if (*p == '"') {
+			p++;
+			separator = p;
+			while (*p && *p != '"') p++;
+			if (*p == '\0') break;
+			*p = '\0';
+			p++;
+		} else break;
+
+		while (*p && *p != ')') p++;
+		if (*p == '\0') break;
+		p++;
+
+		namespace = g_new(IMAPNameSpace, 1);
+		namespace->name = g_strdup(name);
+		namespace->separator = separator ? separator[0] : '\0';
+		ns_list = g_list_append(ns_list, namespace);
+	}
+
+	return ns_list;
+}
+
+static void imap_parse_namespace(IMAPSession *session, IMAPFolder *folder)
+{
+	gchar *ns_str = NULL;
+	gchar **str_array;
+
+	g_return_if_fail(session != NULL);
+	g_return_if_fail(folder != NULL);
+
+	if (folder->ns_personal != NULL ||
+	    folder->ns_others   != NULL ||
+	    folder->ns_shared   != NULL)
+		return;
+
+	if (imap_cmd_namespace(session, &ns_str) != IMAP_SUCCESS) {
+		log_warning(_("can't get namespace\n"));
+		imap_get_namespace_by_list(session, folder);
+		return;
+	}
+
+	str_array = strsplit_parenthesis(ns_str, '(', ')', 3);
+	if (str_array[0])
+		folder->ns_personal = imap_parse_namespace_str(str_array[0]);
+	if (str_array[0] && str_array[1])
+		folder->ns_others = imap_parse_namespace_str(str_array[1]);
+	if (str_array[0] && str_array[1] && str_array[2])
+		folder->ns_shared = imap_parse_namespace_str(str_array[2]);
+	g_strfreev(str_array);
+	g_free(ns_str);
+}
+
+static void imap_get_namespace_by_list(IMAPSession *session, IMAPFolder *folder)
+{
+	GSList *item_list, *cur;
+	gchar separator = '\0';
+	IMAPNameSpace *namespace;
+
+	g_return_if_fail(session != NULL);
+	g_return_if_fail(folder != NULL);
+
+	if (folder->ns_personal != NULL ||
+	    folder->ns_others   != NULL ||
+	    folder->ns_shared   != NULL)
+		return;
+
+	imap_cmd_gen_send(session, "LIST \"\" \"\"");
+	item_list = imap_parse_list(session, "", &separator);
+	for (cur = item_list; cur != NULL; cur = cur->next)
+		folder_item_destroy(FOLDER_ITEM(cur->data));
+	g_slist_free(item_list);
+
+	namespace = g_new(IMAPNameSpace, 1);
+	namespace->name = g_strdup("");
+	namespace->separator = separator;
+	folder->ns_personal = g_list_append(NULL, namespace);
+}
+
+static IMAPNameSpace *imap_find_namespace_from_list(GList *ns_list,
+						    const gchar *path)
+{
+	IMAPNameSpace *namespace = NULL;
+	gchar *tmp_path, *name;
+
+	if (!path) path = "";
+
+	for (; ns_list != NULL; ns_list = ns_list->next) {
+		IMAPNameSpace *tmp_ns = ns_list->data;
+
+		Xstrcat_a(tmp_path, path, "/", return namespace);
+		Xstrdup_a(name, tmp_ns->name, return namespace);
+		if (tmp_ns->separator && tmp_ns->separator != '/') {
+			subst_char(tmp_path, tmp_ns->separator, '/');
+			subst_char(name, tmp_ns->separator, '/');
+		}
+		if (strncmp(tmp_path, name, strlen(name)) == 0)
+			namespace = tmp_ns;
+	}
+
+	return namespace;
+}
+
+static IMAPNameSpace *imap_find_namespace(IMAPFolder *folder,
+					  const gchar *path)
+{
+	IMAPNameSpace *namespace;
+
+	g_return_val_if_fail(folder != NULL, NULL);
+
+	namespace = imap_find_namespace_from_list(folder->ns_personal, path);
+	if (namespace) return namespace;
+	namespace = imap_find_namespace_from_list(folder->ns_others, path);
+	if (namespace) return namespace;
+	namespace = imap_find_namespace_from_list(folder->ns_shared, path);
+	if (namespace) return namespace;
+
+	return NULL;
+}
+
+static gchar imap_get_path_separator(IMAPFolder *folder, const gchar *path)
+{
+	IMAPNameSpace *namespace;
+	gchar separator = '/';
+
+	namespace = imap_find_namespace(folder, path);
+	if (namespace && namespace->separator)
+		separator = namespace->separator;
+
+	return separator;
+}
+
+static gchar *imap_get_real_path(IMAPFolder *folder, const gchar *path)
+{
+	gchar *real_path;
+	gchar separator;
+
+	g_return_val_if_fail(folder != NULL, NULL);
+	g_return_val_if_fail(path != NULL, NULL);
+
+	real_path = imap_utf8_to_modified_utf7(path);
+	separator = imap_get_path_separator(folder, path);
+	imap_path_separator_subst(real_path, separator);
+
+	return real_path;
+}
+
+static gchar *imap_parse_atom(IMAPSession *session, gchar *src,
+			      gchar *dest, gint dest_len, GString *str)
+{
+	gchar *cur_pos = src;
+	gchar *nextline;
+
+	g_return_val_if_fail(str != NULL, cur_pos);
+
+	/* read the next line if the current response buffer is empty */
+	while (g_ascii_isspace(*cur_pos)) cur_pos++;
+	while (*cur_pos == '\0') {
+		if (sock_getline(SESSION(session)->sock, &nextline) < 0)
+			return cur_pos;
+		g_string_assign(str, nextline);
+		cur_pos = str->str;
+		strretchomp(nextline);
+		/* log_print("IMAP4< %s\n", nextline); */
+		debug_print("IMAP4< %s\n", nextline);
+		g_free(nextline);
+
+		while (g_ascii_isspace(*cur_pos)) cur_pos++;
+	}
+
+	if (!strncmp(cur_pos, "NIL", 3)) {
+		*dest = '\0';
+		cur_pos += 3;
+	} else if (*cur_pos == '\"') {
+		gchar *p;
+
+		p = get_quoted(cur_pos, '\"', dest, dest_len);
+		cur_pos = p ? p : cur_pos + 2;
+	} else if (*cur_pos == '{') {
+		gchar buf[32];
+		gint len;
+		gint block_len = 0;
+
+		cur_pos = strchr_cpy(cur_pos + 1, '}', buf, sizeof(buf));
+		len = atoi(buf);
+		g_return_val_if_fail(len >= 0, cur_pos);
+
+		g_string_truncate(str, 0);
+		cur_pos = str->str;
+
+		do {
+			gint cur_len;
+
+			cur_len = sock_getline(SESSION(session)->sock,
+					       &nextline);
+			if (cur_len < 0)
+				return cur_pos;
+			block_len += cur_len;
+			subst_null(nextline, cur_len, ' ');
+			g_string_append(str, nextline);
+			cur_pos = str->str;
+			strretchomp(nextline);
+			/* log_print("IMAP4< %s\n", nextline); */
+			debug_print("IMAP4< %s\n", nextline);
+			g_free(nextline);
+		} while (block_len < len);
+
+		memcpy(dest, cur_pos, MIN(len, dest_len - 1));
+		dest[MIN(len, dest_len - 1)] = '\0';
+		cur_pos += len;
+	}
+
+	return cur_pos;
+}
+
+static gchar *imap_get_header(IMAPSession *session, gchar *cur_pos,
+			      gchar **headers, GString *str)
+{
+	gchar *nextline;
+	gchar buf[32];
+	gint len;
+	gint block_len = 0;
+
+	*headers = NULL;
+
+	g_return_val_if_fail(str != NULL, cur_pos);
+
+	while (g_ascii_isspace(*cur_pos)) cur_pos++;
+
+	g_return_val_if_fail(*cur_pos == '{', cur_pos);
+
+	cur_pos = strchr_cpy(cur_pos + 1, '}', buf, sizeof(buf));
+	len = atoi(buf);
+	g_return_val_if_fail(len >= 0, cur_pos);
+
+	g_string_truncate(str, 0);
+	cur_pos = str->str;
+
+	do {
+		gint cur_len;
+
+		cur_len = sock_getline(SESSION(session)->sock, &nextline);
+		if (cur_len < 0)
+			return cur_pos;
+		block_len += cur_len;
+		subst_null(nextline, cur_len, ' ');
+		g_string_append(str, nextline);
+		cur_pos = str->str;
+		/* strretchomp(nextline); */
+		/* debug_print("IMAP4< %s\n", nextline); */
+		g_free(nextline);
+	} while (block_len < len);
+
+	debug_print("IMAP4< [contents of RFC822.HEADER]\n");
+
+	*headers = g_strndup(cur_pos, len);
+	cur_pos += len;
+
+	while (g_ascii_isspace(*cur_pos)) cur_pos++;
+	while (*cur_pos == '\0') {
+		if (sock_getline(SESSION(session)->sock, &nextline) < 0)
+			return cur_pos;
+		g_string_assign(str, nextline);
+		cur_pos = str->str;
+		strretchomp(nextline);
+		debug_print("IMAP4< %s\n", nextline);
+		g_free(nextline);
+
+		while (g_ascii_isspace(*cur_pos)) cur_pos++;
+	}
+
+	return cur_pos;
+}
+
+static MsgFlags imap_parse_flags(const gchar *flag_str)  
+{
+	const gchar *p = flag_str;
+	MsgFlags flags = {0, 0};
+
+	flags.perm_flags = MSG_UNREAD;
+
+	while ((p = strchr(p, '\\')) != NULL) {
+		p++;
+
+		if (g_ascii_strncasecmp(p, "Recent", 6) == 0 &&
+		    MSG_IS_UNREAD(flags)) {
+			MSG_SET_PERM_FLAGS(flags, MSG_NEW);
+		} else if (g_ascii_strncasecmp(p, "Seen", 4) == 0) {
+			MSG_UNSET_PERM_FLAGS(flags, MSG_NEW|MSG_UNREAD);
+		} else if (g_ascii_strncasecmp(p, "Deleted", 7) == 0) {
+			MSG_SET_PERM_FLAGS(flags, MSG_DELETED);
+		} else if (g_ascii_strncasecmp(p, "Flagged", 7) == 0) {
+			MSG_SET_PERM_FLAGS(flags, MSG_MARKED);
+		} else if (g_ascii_strncasecmp(p, "Answered", 8) == 0) {
+			MSG_SET_PERM_FLAGS(flags, MSG_REPLIED);
+		}
+	}
+
+	return flags;
+}
+
+static IMAPFlags imap_parse_imap_flags(const gchar *flag_str)  
+{
+	const gchar *p = flag_str;
+	IMAPFlags flags = 0;
+
+	while ((p = strchr(p, '\\')) != NULL) {
+		p++;
+
+		if (g_ascii_strncasecmp(p, "Seen", 4) == 0) {
+			flags |= IMAP_FLAG_SEEN;
+		} else if (g_ascii_strncasecmp(p, "Deleted", 7) == 0) {
+			flags |= IMAP_FLAG_DELETED;
+		} else if (g_ascii_strncasecmp(p, "Flagged", 7) == 0) {
+			flags |= IMAP_FLAG_FLAGGED;
+		} else if (g_ascii_strncasecmp(p, "Answered", 8) == 0) {
+			flags |= IMAP_FLAG_ANSWERED;
+		}
+	}
+
+	return flags;
+}
+
+static MsgInfo *imap_parse_envelope(IMAPSession *session, FolderItem *item,
+				    GString *line_str)
+{
+	gchar buf[IMAPBUFSIZE];
+	MsgInfo *msginfo = NULL;
+	gchar *cur_pos;
+	gint msgnum;
+	guint32 uid = 0;
+	size_t size = 0;
+	MsgFlags flags = {0, 0}, imap_flags = {0, 0};
+
+	g_return_val_if_fail(line_str != NULL, NULL);
+	g_return_val_if_fail(line_str->str[0] == '*' &&
+			     line_str->str[1] == ' ', NULL);
+
+	MSG_SET_TMP_FLAGS(flags, MSG_IMAP);
+	if (item->stype == F_QUEUE) {
+		MSG_SET_TMP_FLAGS(flags, MSG_QUEUED);
+	} else if (item->stype == F_DRAFT) {
+		MSG_SET_TMP_FLAGS(flags, MSG_DRAFT);
+	}
+
+	cur_pos = line_str->str + 2;
+
+#define PARSE_ONE_ELEMENT(ch)					\
+{								\
+	cur_pos = strchr_cpy(cur_pos, ch, buf, sizeof(buf));	\
+	if (cur_pos == NULL) {					\
+		g_warning("cur_pos == NULL\n");			\
+		procmsg_msginfo_free(msginfo);			\
+		return NULL;					\
+	}							\
+}
+
+	PARSE_ONE_ELEMENT(' ');
+	msgnum = atoi(buf);
+
+	PARSE_ONE_ELEMENT(' ');
+	g_return_val_if_fail(!strcmp(buf, "FETCH"), NULL);
+
+	g_return_val_if_fail(*cur_pos == '(', NULL);
+	cur_pos++;
+
+	while (*cur_pos != '\0' && *cur_pos != ')') {
+		while (*cur_pos == ' ') cur_pos++;
+
+		if (!strncmp(cur_pos, "UID ", 4)) {
+			cur_pos += 4;
+			uid = strtoul(cur_pos, &cur_pos, 10);
+		} else if (!strncmp(cur_pos, "FLAGS ", 6)) {
+			cur_pos += 6;
+			if (*cur_pos != '(') {
+				g_warning("*cur_pos != '('\n");
+				procmsg_msginfo_free(msginfo);
+				return NULL;
+			}
+			cur_pos++;
+			PARSE_ONE_ELEMENT(')');
+			imap_flags = imap_parse_flags(buf);
+		} else if (!strncmp(cur_pos, "RFC822.SIZE ", 12)) {
+			cur_pos += 12;
+			size = strtol(cur_pos, &cur_pos, 10);
+		} else if (!strncmp(cur_pos, "RFC822.HEADER ", 14)) {
+			gchar *headers;
+
+			cur_pos += 14;
+			cur_pos = imap_get_header(session, cur_pos, &headers,
+						  line_str);
+			msginfo = procheader_parse_str(headers, flags, FALSE);
+			g_free(headers);
+		} else {
+			g_warning("invalid FETCH response: %s\n", cur_pos);
+			break;
+		}
+	}
+
+#undef PARSE_ONE_ELEMENT
+
+	if (msginfo) {
+		msginfo->msgnum = uid;
+		msginfo->size = size;
+		msginfo->flags.tmp_flags |= imap_flags.tmp_flags;
+		msginfo->flags.perm_flags = imap_flags.perm_flags;
+	}
+
+	return msginfo;
+}
+
+static gint imap_msg_list_change_perm_flags(GSList *msglist, MsgPermFlags flags,
+					    gboolean is_set)
+{
+	Folder *folder;
+	IMAPSession *session;
+	IMAPFlags iflags = 0;
+	MsgInfo *msginfo;
+	GSList *seq_list, *cur;
+	gint ok = IMAP_SUCCESS;
+
+	if (msglist == NULL) return IMAP_SUCCESS;
+
+	msginfo = (MsgInfo *)msglist->data;
+	g_return_val_if_fail(msginfo != NULL, -1);
+
+	g_return_val_if_fail(MSG_IS_IMAP(msginfo->flags), -1);
+	g_return_val_if_fail(msginfo->folder != NULL, -1);
+	g_return_val_if_fail(msginfo->folder->folder != NULL, -1);
+
+	folder = msginfo->folder->folder;
+	g_return_val_if_fail(FOLDER_TYPE(folder) == F_IMAP, -1);
+
+	session = imap_session_get(folder);
+	if (!session) return -1;
+
+	ok = imap_select(session, IMAP_FOLDER(folder), msginfo->folder->path,
+			 NULL, NULL, NULL, NULL);
+	if (ok != IMAP_SUCCESS)
+		return ok;
+
+	seq_list = imap_get_seq_set_from_msglist(msglist);
+
+	if (flags & MSG_MARKED)  iflags |= IMAP_FLAG_FLAGGED;
+	if (flags & MSG_REPLIED) iflags |= IMAP_FLAG_ANSWERED;
+
+	for (cur = seq_list; cur != NULL; cur = cur->next) {
+		gchar *seq_set = (gchar *)cur->data;
+
+		if (iflags) {
+			ok = imap_set_message_flags(session, seq_set, iflags,
+						    is_set);
+			if (ok != IMAP_SUCCESS) break;
+		}
+
+		if (flags & MSG_UNREAD) {
+			ok = imap_set_message_flags(session, seq_set,
+						    IMAP_FLAG_SEEN, !is_set);
+			if (ok != IMAP_SUCCESS) break;
+		}
+	}
+
+	imap_seq_set_free(seq_list);
+
+	return ok;
+}
+
+gint imap_msg_set_perm_flags(MsgInfo *msginfo, MsgPermFlags flags)
+{
+	GSList msglist;
+
+	msglist.data = msginfo;
+	msglist.next = NULL;
+
+	return imap_msg_list_change_perm_flags(&msglist, flags, TRUE);
+}
+
+gint imap_msg_unset_perm_flags(MsgInfo *msginfo, MsgPermFlags flags)
+{
+	GSList msglist;
+
+	msglist.data = msginfo;
+	msglist.next = NULL;
+
+	return imap_msg_list_change_perm_flags(&msglist, flags, FALSE);
+}
+
+gint imap_msg_list_set_perm_flags(GSList *msglist, MsgPermFlags flags)
+{
+	return imap_msg_list_change_perm_flags(msglist, flags, TRUE);
+}
+
+gint imap_msg_list_unset_perm_flags(GSList *msglist, MsgPermFlags flags)
+{
+	return imap_msg_list_change_perm_flags(msglist, flags, FALSE);
+}
+
+static gchar *imap_get_flag_str(IMAPFlags flags)
+{
+	GString *str;
+	gchar *ret;
+
+	str = g_string_new(NULL);
+
+	if (IMAP_IS_SEEN(flags))	g_string_append(str, "\\Seen ");
+	if (IMAP_IS_ANSWERED(flags))	g_string_append(str, "\\Answered ");
+	if (IMAP_IS_FLAGGED(flags))	g_string_append(str, "\\Flagged ");
+	if (IMAP_IS_DELETED(flags))	g_string_append(str, "\\Deleted ");
+	if (IMAP_IS_DRAFT(flags))	g_string_append(str, "\\Draft");
+
+	if (str->len > 0 && str->str[str->len - 1] == ' ')
+		g_string_truncate(str, str->len - 1);
+
+	ret = str->str;
+	g_string_free(str, FALSE);
+
+	return ret;
+}
+
+static gint imap_set_message_flags(IMAPSession *session,
+				   const gchar *seq_set,
+				   IMAPFlags flags,
+				   gboolean is_set)
+{
+	gchar *cmd;
+	gchar *flag_str;
+	gint ok;
+
+	flag_str = imap_get_flag_str(flags);
+	cmd = g_strconcat(is_set ? "+FLAGS.SILENT (" : "-FLAGS.SILENT (",
+			  flag_str, ")", NULL);
+	g_free(flag_str);
+
+	ok = imap_cmd_store(session, seq_set, cmd);
+	g_free(cmd);
+
+	return ok;
+}
+
+static gint imap_select(IMAPSession *session, IMAPFolder *folder,
+			const gchar *path,
+			gint *exists, gint *recent, gint *unseen,
+			guint32 *uid_validity)
+{
+	gchar *real_path;
+	gint ok;
+	gint exists_, recent_, unseen_, uid_validity_;
+
+	if (!exists || !recent || !unseen || !uid_validity) {
+		if (session->mbox && strcmp(session->mbox, path) == 0)
+			return IMAP_SUCCESS;
+		exists = &exists_;
+		recent = &recent_;
+		unseen = &unseen_;
+		uid_validity = &uid_validity_;
+	}
+
+	g_free(session->mbox);
+	session->mbox = NULL;
+
+	real_path = imap_get_real_path(folder, path);
+	ok = imap_cmd_select(session, real_path,
+			     exists, recent, unseen, uid_validity);
+	if (ok != IMAP_SUCCESS)
+		log_warning(_("can't select folder: %s\n"), real_path);
+	else
+		session->mbox = g_strdup(path);
+	g_free(real_path);
+
+	return ok;
+}
+
+#define THROW(err) { ok = err; goto catch; }
+
+static gint imap_status(IMAPSession *session, IMAPFolder *folder,
+			const gchar *path,
+			gint *messages, gint *recent,
+			guint32 *uid_next, guint32 *uid_validity,
+			gint *unseen)
+{
+	gchar *real_path;
+	gchar *real_path_;
+	gint ok;
+	GPtrArray *argbuf = NULL;
+	gchar *str;
+
+	if (messages && recent && uid_next && uid_validity && unseen) {
+		*messages = *recent = *uid_next = *uid_validity = *unseen = 0;
+		argbuf = g_ptr_array_new();
+	}
+
+	real_path = imap_get_real_path(folder, path);
+	QUOTE_IF_REQUIRED(real_path_, real_path);
+	imap_cmd_gen_send(session, "STATUS %s "
+			  "(MESSAGES RECENT UIDNEXT UIDVALIDITY UNSEEN)",
+			  real_path_);
+
+	ok = imap_cmd_ok(session, argbuf);
+	if (ok != IMAP_SUCCESS || !argbuf) THROW(ok);
+
+	str = search_array_str(argbuf, "STATUS");
+	if (!str) THROW(IMAP_ERROR);
+
+	str = strchr(str, '(');
+	if (!str) THROW(IMAP_ERROR);
+	str++;
+	while (*str != '\0' && *str != ')') {
+		while (*str == ' ') str++;
+
+		if (!strncmp(str, "MESSAGES ", 9)) {
+			str += 9;
+			*messages = strtol(str, &str, 10);
+		} else if (!strncmp(str, "RECENT ", 7)) {
+			str += 7;
+			*recent = strtol(str, &str, 10);
+		} else if (!strncmp(str, "UIDNEXT ", 8)) {
+			str += 8;
+			*uid_next = strtoul(str, &str, 10);
+		} else if (!strncmp(str, "UIDVALIDITY ", 12)) {
+			str += 12;
+			*uid_validity = strtoul(str, &str, 10);
+		} else if (!strncmp(str, "UNSEEN ", 7)) {
+			str += 7;
+			*unseen = strtol(str, &str, 10);
+		} else {
+			g_warning("invalid STATUS response: %s\n", str);
+			break;
+		}
+	}
+
+catch:
+	g_free(real_path);
+	if (argbuf) {
+		ptr_array_free_strings(argbuf);
+		g_ptr_array_free(argbuf, TRUE);
+	}
+
+	return ok;
+}
+
+#undef THROW
+
+static gboolean imap_has_capability(IMAPSession	*session,
+				    const gchar *capability)
+{
+	gchar **p;
+
+	for (p = session->capability; *p != NULL; ++p) {
+		if (!g_ascii_strcasecmp(*p, capability))
+			return TRUE;
+	}
+
+	return FALSE;
+}
+
+static void imap_capability_free(IMAPSession *session)
+{
+	if (session->capability) {
+		g_strfreev(session->capability);
+		session->capability = NULL;
+	}
+}
+
+
+/* low-level IMAP4rev1 commands */
+
+#define THROW(err) { ok = err; goto catch; }
+
+static gint imap_cmd_capability(IMAPSession *session)
+{
+	gint ok;
+	GPtrArray *argbuf;
+	gchar *capability;
+
+	argbuf = g_ptr_array_new();
+
+	imap_cmd_gen_send(session, "CAPABILITY");
+	if ((ok = imap_cmd_ok(session, argbuf)) != IMAP_SUCCESS) THROW(ok);
+
+	capability = search_array_str(argbuf, "CAPABILITY ");
+	if (!capability) THROW(IMAP_ERROR);
+
+	capability += strlen("CAPABILITY ");
+
+	imap_capability_free(session);
+	session->capability = g_strsplit(capability, " ", -1);
+
+catch:
+	ptr_array_free_strings(argbuf);
+	g_ptr_array_free(argbuf, TRUE);
+
+	return ok;
+}
+
+#undef THROW
+
+static gint imap_cmd_authenticate(IMAPSession *session, const gchar *user,
+				  const gchar *pass, IMAPAuthType type)
+{
+	gchar *auth_type;
+	gint ok;
+	gchar *buf = NULL;
+	gchar *challenge;
+	gint challenge_len;
+	gchar hexdigest[33];
+	gchar *response;
+	gchar *response64;
+
+	g_return_val_if_fail((type == 0 || type == IMAP_AUTH_CRAM_MD5),
+			     IMAP_ERROR);
+
+	auth_type = "CRAM-MD5";
+
+	imap_cmd_gen_send(session, "AUTHENTICATE %s", auth_type);
+	ok = imap_cmd_gen_recv(session, &buf);
+	if (ok != IMAP_SUCCESS || buf[0] != '+' || buf[1] != ' ') {
+		g_free(buf);
+		return IMAP_ERROR;
+	}
+
+	challenge = g_malloc(strlen(buf + 2) + 1);
+	challenge_len = base64_decode(challenge, buf + 2, -1);
+	challenge[challenge_len] = '\0';
+	g_free(buf);
+	log_print("IMAP< [Decoded: %s]\n", challenge);
+
+	md5_hex_hmac(hexdigest, challenge, challenge_len, pass, strlen(pass));
+	g_free(challenge);
+
+	response = g_strdup_printf("%s %s", user, hexdigest);
+	log_print("IMAP> [Encoded: %s]\n", response);
+	response64 = g_malloc((strlen(response) + 3) * 2 + 1);
+	base64_encode(response64, response, strlen(response));
+	g_free(response);
+
+	log_print("IMAP> %s\n", response64);
+	sock_puts(SESSION(session)->sock, response64);
+	ok = imap_cmd_ok(session, NULL);
+	if (ok != IMAP_SUCCESS)
+		log_warning(_("IMAP4 authentication failed.\n"));
+
+	return ok;
+}
+
+static gint imap_cmd_login(IMAPSession *session,
+			   const gchar *user, const gchar *pass)
+{
+	gchar *user_, *pass_;
+	gint ok;
+
+	QUOTE_IF_REQUIRED(user_, user);
+	QUOTE_IF_REQUIRED(pass_, pass);
+	imap_cmd_gen_send(session, "LOGIN %s %s", user_, pass_);
+
+	ok = imap_cmd_ok(session, NULL);
+	if (ok != IMAP_SUCCESS)
+		log_warning(_("IMAP4 login failed.\n"));
+
+	return ok;
+}
+
+static gint imap_cmd_logout(IMAPSession *session)
+{
+	imap_cmd_gen_send(session, "LOGOUT");
+	return imap_cmd_ok(session, NULL);
+}
+
+static gint imap_cmd_noop(IMAPSession *session)
+{
+	imap_cmd_gen_send(session, "NOOP");
+	return imap_cmd_ok(session, NULL);
+}
+
+#if USE_SSL
+static gint imap_cmd_starttls(IMAPSession *session)
+{
+	imap_cmd_gen_send(session, "STARTTLS");
+	return imap_cmd_ok(session, NULL);
+}
+#endif
+
+#define THROW(err) { ok = err; goto catch; }
+
+static gint imap_cmd_namespace(IMAPSession *session, gchar **ns_str)
+{
+	gint ok;
+	GPtrArray *argbuf;
+	gchar *str;
+
+	argbuf = g_ptr_array_new();
+
+	imap_cmd_gen_send(session, "NAMESPACE");
+	if ((ok = imap_cmd_ok(session, argbuf)) != IMAP_SUCCESS) THROW(ok);
+
+	str = search_array_str(argbuf, "NAMESPACE");
+	if (!str) THROW(IMAP_ERROR);
+
+	*ns_str = g_strdup(str);
+
+catch:
+	ptr_array_free_strings(argbuf);
+	g_ptr_array_free(argbuf, TRUE);
+
+	return ok;
+}
+
+#undef THROW
+
+static gint imap_cmd_list(IMAPSession *session, const gchar *ref,
+			  const gchar *mailbox, GPtrArray *argbuf)
+{
+	gchar *ref_, *mailbox_;
+
+	if (!ref) ref = "\"\"";
+	if (!mailbox) mailbox = "\"\"";
+
+	QUOTE_IF_REQUIRED(ref_, ref);
+	QUOTE_IF_REQUIRED(mailbox_, mailbox);
+	imap_cmd_gen_send(session, "LIST %s %s", ref_, mailbox_);
+
+	return imap_cmd_ok(session, argbuf);
+}
+
+#define THROW goto catch
+
+static gint imap_cmd_do_select(IMAPSession *session, const gchar *folder,
+			       gboolean examine,
+			       gint *exists, gint *recent, gint *unseen,
+			       guint32 *uid_validity)
+{
+	gint ok;
+	gchar *resp_str;
+	GPtrArray *argbuf;
+	gchar *select_cmd;
+	gchar *folder_;
+	guint uid_validity_;
+
+	*exists = *recent = *unseen = *uid_validity = 0;
+	argbuf = g_ptr_array_new();
+
+	if (examine)
+		select_cmd = "EXAMINE";
+	else
+		select_cmd = "SELECT";
+
+	QUOTE_IF_REQUIRED(folder_, folder);
+	imap_cmd_gen_send(session, "%s %s", select_cmd, folder_);
+
+	if ((ok = imap_cmd_ok(session, argbuf)) != IMAP_SUCCESS) THROW;
+
+	resp_str = search_array_contain_str(argbuf, "EXISTS");
+	if (resp_str) {
+		if (sscanf(resp_str,"%d EXISTS", exists) != 1) {
+			g_warning("imap_cmd_select(): invalid EXISTS line.\n");
+			THROW;
+		}
+	}
+
+	resp_str = search_array_contain_str(argbuf, "RECENT");
+	if (resp_str) {
+		if (sscanf(resp_str, "%d RECENT", recent) != 1) {
+			g_warning("imap_cmd_select(): invalid RECENT line.\n");
+			THROW;
+		}
+	}
+
+	resp_str = search_array_contain_str(argbuf, "UIDVALIDITY");
+	if (resp_str) {
+		if (sscanf(resp_str, "OK [UIDVALIDITY %u] ", &uid_validity_)
+		    != 1) {
+			g_warning("imap_cmd_select(): invalid UIDVALIDITY line.\n");
+			THROW;
+		}
+		*uid_validity = uid_validity_;
+	}
+
+	resp_str = search_array_contain_str(argbuf, "UNSEEN");
+	if (resp_str) {
+		if (sscanf(resp_str, "OK [UNSEEN %d] ", unseen) != 1) {
+			g_warning("imap_cmd_select(): invalid UNSEEN line.\n");
+			THROW;
+		}
+	}
+
+catch:
+	ptr_array_free_strings(argbuf);
+	g_ptr_array_free(argbuf, TRUE);
+
+	return ok;
+}
+
+static gint imap_cmd_select(IMAPSession *session, const gchar *folder,
+			    gint *exists, gint *recent, gint *unseen,
+			    guint32 *uid_validity)
+{
+	return imap_cmd_do_select(session, folder, FALSE,
+				  exists, recent, unseen, uid_validity);
+}
+
+static gint imap_cmd_examine(IMAPSession *session, const gchar *folder,
+			     gint *exists, gint *recent, gint *unseen,
+			     guint32 *uid_validity)
+{
+	return imap_cmd_do_select(session, folder, TRUE,
+				  exists, recent, unseen, uid_validity);
+}
+
+#undef THROW
+
+static gint imap_cmd_create(IMAPSession *session, const gchar *folder)
+{
+	gchar *folder_;
+
+	QUOTE_IF_REQUIRED(folder_, folder);
+	imap_cmd_gen_send(session, "CREATE %s", folder_);
+
+	return imap_cmd_ok(session, NULL);
+}
+
+static gint imap_cmd_rename(IMAPSession *session, const gchar *old_folder,
+			    const gchar *new_folder)
+{
+	gchar *old_folder_, *new_folder_;
+
+	QUOTE_IF_REQUIRED(old_folder_, old_folder);
+	QUOTE_IF_REQUIRED(new_folder_, new_folder);
+	imap_cmd_gen_send(session, "RENAME %s %s", old_folder_, new_folder_);
+
+	return imap_cmd_ok(session, NULL);
+}
+
+static gint imap_cmd_delete(IMAPSession *session, const gchar *folder)
+{
+	gchar *folder_;
+
+	QUOTE_IF_REQUIRED(folder_, folder);
+	imap_cmd_gen_send(session, "DELETE %s", folder_);
+
+	return imap_cmd_ok(session, NULL);
+}
+
+#define THROW(err) { ok = err; goto catch; }
+
+static gint imap_cmd_search(IMAPSession *session, const gchar *criteria,
+			    GArray **result)
+{
+	gint ok;
+	GPtrArray *argbuf;
+	GArray *array;
+	gchar *str;
+	gchar *p, *ep;
+	gint i;
+	guint32 uid;
+
+	g_return_val_if_fail(criteria != NULL, IMAP_ERROR);
+	g_return_val_if_fail(result != NULL, IMAP_ERROR);
+
+	argbuf = g_ptr_array_new();
+
+	imap_cmd_gen_send(session, "UID SEARCH %s", criteria);
+	if ((ok = imap_cmd_ok(session, argbuf)) != IMAP_SUCCESS) THROW(ok);
+
+	array = g_array_new(FALSE, FALSE, sizeof(guint32));
+
+	for (i = 0; i < argbuf->len; i++) {
+		str = g_ptr_array_index(argbuf, i);
+		if (strncmp(str, "SEARCH", 6) != 0)
+			continue;
+
+		p = str + 6;
+		while (*p != '\0') {
+			uid = strtoul(p, &ep, 10);
+			if (p < ep && uid > 0) {
+				g_array_append_val(array, uid);
+				p = ep;
+			} else
+				break;
+		}
+	}
+
+	*result = array;
+
+catch:
+	ptr_array_free_strings(argbuf);
+	g_ptr_array_free(argbuf, TRUE);
+
+	return ok;
+}
+
+static gint imap_cmd_fetch(IMAPSession *session, guint32 uid,
+			   const gchar *filename)
+{
+	gint ok;
+	gchar *buf;
+	gchar *cur_pos;
+	gchar size_str[32];
+	glong size_num;
+	gint ret;
+
+	g_return_val_if_fail(filename != NULL, IMAP_ERROR);
+
+	imap_cmd_gen_send(session, "UID FETCH %d BODY.PEEK[]", uid);
+
+	while ((ok = imap_cmd_gen_recv(session, &buf)) == IMAP_SUCCESS) {
+		if (buf[0] != '*' || buf[1] != ' ') {
+			g_free(buf);
+			return IMAP_ERROR;
+		}
+		if (strstr(buf, "FETCH") != NULL) break;
+		g_free(buf);
+	}
+	if (ok != IMAP_SUCCESS)
+		return ok;
+
+#define RETURN_ERROR_IF_FAIL(cond)	\
+	if (!(cond)) {			\
+		g_free(buf);		\
+		return IMAP_ERROR;	\
+	}
+
+	cur_pos = strchr(buf, '{');
+	RETURN_ERROR_IF_FAIL(cur_pos != NULL);
+	cur_pos = strchr_cpy(cur_pos + 1, '}', size_str, sizeof(size_str));
+	RETURN_ERROR_IF_FAIL(cur_pos != NULL);
+	size_num = atol(size_str);
+	RETURN_ERROR_IF_FAIL(size_num >= 0);
+
+	RETURN_ERROR_IF_FAIL(*cur_pos == '\0');
+
+#undef RETURN_ERROR_IF_FAIL
+
+	g_free(buf);
+
+	if ((ret = recv_bytes_write_to_file(SESSION(session)->sock,
+					    size_num, filename)) != 0) {
+		if (ret == -2)
+			return IMAP_SOCKET;
+	}
+
+	if (imap_cmd_gen_recv(session, &buf) != IMAP_SUCCESS)
+		return IMAP_ERROR;
+
+	if (buf[0] == '\0' || buf[strlen(buf) - 1] != ')') {
+		g_free(buf);
+		return IMAP_ERROR;
+	}
+	g_free(buf);
+
+	ok = imap_cmd_ok(session, NULL);
+
+	if (ret != 0)
+		return IMAP_ERROR;
+
+	return ok;
+}
+
+static gint imap_cmd_append(IMAPSession *session, const gchar *destfolder,
+			    const gchar *file, IMAPFlags flags,
+			    guint32 *new_uid)
+{
+	gint ok;
+	gint size;
+	gchar *destfolder_;
+	gchar *flag_str;
+	guint new_uid_;
+	gchar *ret = NULL;
+	gchar buf[BUFFSIZE];
+	FILE *fp;
+	GPtrArray *argbuf;
+	gchar *resp_str;
+
+	g_return_val_if_fail(file != NULL, IMAP_ERROR);
+
+	size = get_file_size_as_crlf(file);
+	if ((fp = g_fopen(file, "rb")) == NULL) {
+		FILE_OP_ERROR(file, "fopen");
+		return -1;
+	}
+	QUOTE_IF_REQUIRED(destfolder_, destfolder);
+	flag_str = imap_get_flag_str(flags);
+	imap_cmd_gen_send(session, "APPEND %s (%s) {%d}",
+			  destfolder_, flag_str, size);
+	g_free(flag_str);
+
+	ok = imap_cmd_gen_recv(session, &ret);
+	if (ok != IMAP_SUCCESS || ret[0] != '+' || ret[1] != ' ') {
+		log_warning(_("can't append %s to %s\n"), file, destfolder_);
+		g_free(ret);
+		fclose(fp);
+		return IMAP_ERROR;
+	}
+	g_free(ret);
+
+	log_print("IMAP4> %s\n", _("(sending file...)"));
+
+	while (fgets(buf, sizeof(buf), fp) != NULL) {
+		strretchomp(buf);
+		if (sock_puts(SESSION(session)->sock, buf) < 0) {
+			fclose(fp);
+			return -1;
+		}
+	}
+
+	if (ferror(fp)) {
+		FILE_OP_ERROR(file, "fgets");
+		fclose(fp);
+		return -1;
+	}
+
+	sock_puts(SESSION(session)->sock, "");
+
+	fclose(fp);
+
+	if (new_uid != NULL)
+		*new_uid = 0;
+
+	if (new_uid != NULL && session->uidplus) {
+		argbuf = g_ptr_array_new();
+
+		ok = imap_cmd_ok(session, argbuf);
+		if (ok != IMAP_SUCCESS)
+			log_warning(_("can't append message to %s\n"),
+				    destfolder_);
+		else if (argbuf->len > 0) {
+			resp_str = g_ptr_array_index(argbuf, argbuf->len - 1);
+			if (resp_str &&
+			    sscanf(resp_str, "%*u OK [APPENDUID %*u %u]",
+				   &new_uid_) == 1) {
+				*new_uid = new_uid_;
+			}
+		}
+
+		ptr_array_free_strings(argbuf);
+		g_ptr_array_free(argbuf, TRUE);
+	} else
+		ok = imap_cmd_ok(session, NULL);
+
+	return ok;
+}
+
+static gint imap_cmd_copy(IMAPSession *session, const gchar *seq_set,
+			  const gchar *destfolder)
+{
+	gint ok;
+	gchar *destfolder_;
+
+	g_return_val_if_fail(destfolder != NULL, IMAP_ERROR);
+
+	QUOTE_IF_REQUIRED(destfolder_, destfolder);
+	imap_cmd_gen_send(session, "UID COPY %s %s", seq_set, destfolder_);
+
+	ok = imap_cmd_ok(session, NULL);
+	if (ok != IMAP_SUCCESS) {
+		log_warning(_("can't copy %s to %s\n"), seq_set, destfolder_);
+		return -1;
+	}
+
+	return ok;
+}
+
+gint imap_cmd_envelope(IMAPSession *session, const gchar *seq_set)
+{
+	imap_cmd_gen_send
+		(session, "UID FETCH %s (UID FLAGS RFC822.SIZE RFC822.HEADER)",
+		 seq_set);
+
+	return IMAP_SUCCESS;
+}
+
+static gint imap_cmd_store(IMAPSession *session, const gchar *seq_set,
+			   const gchar *sub_cmd)
+{
+	gint ok;
+
+	imap_cmd_gen_send(session, "UID STORE %s %s", seq_set, sub_cmd);
+
+	if ((ok = imap_cmd_ok(session, NULL)) != IMAP_SUCCESS) {
+		log_warning(_("error while imap command: STORE %s %s\n"),
+			    seq_set, sub_cmd);
+		return ok;
+	}
+
+	return IMAP_SUCCESS;
+}
+
+static gint imap_cmd_expunge(IMAPSession *session)
+{
+	gint ok;
+
+	imap_cmd_gen_send(session, "EXPUNGE");
+	if ((ok = imap_cmd_ok(session, NULL)) != IMAP_SUCCESS) {
+		log_warning(_("error while imap command: EXPUNGE\n"));
+		return ok;
+	}
+
+	return IMAP_SUCCESS;
+}
+
+static gint imap_cmd_close(IMAPSession *session)
+{
+	gint ok;
+
+	imap_cmd_gen_send(session, "CLOSE");
+	if ((ok = imap_cmd_ok(session, NULL)) != IMAP_SUCCESS)
+		log_warning(_("error while imap command: CLOSE\n"));
+
+	return ok;
+}
+
+static gint imap_cmd_ok(IMAPSession *session, GPtrArray *argbuf)
+{
+	gint ok;
+	gchar *buf;
+	gint cmd_num;
+	gchar cmd_status[IMAPBUFSIZE + 1];
+
+	while ((ok = imap_cmd_gen_recv(session, &buf)) == IMAP_SUCCESS) {
+		if (buf[0] == '*' && buf[1] == ' ') {
+			if (argbuf) {
+				g_memmove(buf, buf + 2, strlen(buf + 2) + 1);
+				g_ptr_array_add(argbuf, buf);
+			} else
+				g_free(buf);
+			continue;
+		}
+
+		if (sscanf(buf, "%d %" Xstr(IMAPBUFSIZE) "s",
+			   &cmd_num, cmd_status) < 2) {
+			g_free(buf);
+			return IMAP_ERROR;
+		} else if (cmd_num == session->cmd_count &&
+			 !strcmp(cmd_status, "OK")) {
+			if (argbuf)
+				g_ptr_array_add(argbuf, buf);
+			else
+				g_free(buf);
+			return IMAP_SUCCESS;
+		} else {
+			g_free(buf);
+			return IMAP_ERROR;
+		}
+	}
+
+	return ok;
+}
+
+static void imap_cmd_gen_send(IMAPSession *session, const gchar *format, ...)
+{
+	gchar buf[IMAPBUFSIZE];
+	gchar tmp[IMAPBUFSIZE];
+	gchar *p;
+	va_list args;
+
+	va_start(args, format);
+	g_vsnprintf(tmp, sizeof(tmp), format, args);
+	va_end(args);
+
+	session->cmd_count++;
+
+	g_snprintf(buf, sizeof(buf), "%d %s\r\n", session->cmd_count, tmp);
+	if (!g_ascii_strncasecmp(tmp, "LOGIN ", 6) &&
+	    (p = strchr(tmp + 6, ' '))) {
+		*p = '\0';
+		log_print("IMAP4> %d %s ********\n", session->cmd_count, tmp);
+	} else
+		log_print("IMAP4> %d %s\n", session->cmd_count, tmp);
+
+	sock_write_all(SESSION(session)->sock, buf, strlen(buf));
+}
+
+static gint imap_cmd_gen_recv(IMAPSession *session, gchar **ret)
+{
+	if (sock_getline(SESSION(session)->sock, ret) < 0)
+		return IMAP_SOCKET;
+
+	strretchomp(*ret);
+
+	log_print("IMAP4< %s\n", *ret);
+
+	session_set_access_time(SESSION(session));
+
+	return IMAP_SUCCESS;
+}
+
+
+/* misc utility functions */
+
+static gchar *strchr_cpy(const gchar *src, gchar ch, gchar *dest, gint len)
+{
+	gchar *tmp;
+
+	dest[0] = '\0';
+	tmp = strchr(src, ch);
+	if (!tmp)
+		return NULL;
+
+	memcpy(dest, src, MIN(tmp - src, len - 1));
+	dest[MIN(tmp - src, len - 1)] = '\0';
+
+	return tmp + 1;
+}
+
+static gchar *get_quoted(const gchar *src, gchar ch, gchar *dest, gint len)
+{
+	const gchar *p = src;
+	gint n = 0;
+
+	g_return_val_if_fail(*p == ch, NULL);
+
+	*dest = '\0';
+	p++;
+
+	while (*p != '\0' && *p != ch) {
+		if (n < len - 1) {
+			if (*p == '\\' && *(p + 1) != '\0')
+				p++;
+			*dest++ = *p++;
+		} else
+			p++;
+		n++;
+	}
+
+	*dest = '\0';
+	return (gchar *)(*p == ch ? p + 1 : p);
+}
+
+static gchar *search_array_contain_str(GPtrArray *array, gchar *str)
+{
+	gint i;
+
+	for (i = 0; i < array->len; i++) {
+		gchar *tmp;
+
+		tmp = g_ptr_array_index(array, i);
+		if (strstr(tmp, str) != NULL)
+			return tmp;
+	}
+
+	return NULL;
+}
+
+static gchar *search_array_str(GPtrArray *array, gchar *str)
+{
+	gint i;
+	gint len;
+
+	len = strlen(str);
+
+	for (i = 0; i < array->len; i++) {
+		gchar *tmp;
+
+		tmp = g_ptr_array_index(array, i);
+		if (!strncmp(tmp, str, len))
+			return tmp;
+	}
+
+	return NULL;
+}
+
+static void imap_path_separator_subst(gchar *str, gchar separator)
+{
+	gchar *p;
+	gboolean in_escape = FALSE;
+
+	if (!separator || separator == '/') return;
+
+	for (p = str; *p != '\0'; p++) {
+		if (*p == '/' && !in_escape)
+			*p = separator;
+		else if (*p == '&' && *(p + 1) != '-' && !in_escape)
+			in_escape = TRUE;
+		else if (*p == '-' && in_escape)
+			in_escape = FALSE;
+	}
+}
+
+static gchar *imap_modified_utf7_to_utf8(const gchar *mutf7_str)
+{
+	static iconv_t cd = (iconv_t)-1;
+	static gboolean iconv_ok = TRUE;
+	GString *norm_utf7;
+	gchar *norm_utf7_p;
+	size_t norm_utf7_len;
+	const gchar *p;
+	gchar *to_str, *to_p;
+	size_t to_len;
+	gboolean in_escape = FALSE;
+
+	if (!iconv_ok) return g_strdup(mutf7_str);
+
+	if (cd == (iconv_t)-1) {
+		cd = iconv_open(CS_INTERNAL, CS_UTF_7);
+		if (cd == (iconv_t)-1) {
+			g_warning("iconv cannot convert UTF-7 to %s\n",
+				  CS_INTERNAL);
+			iconv_ok = FALSE;
+			return g_strdup(mutf7_str);
+		}
+	}
+
+	/* modified UTF-7 to normal UTF-7 conversion */
+	norm_utf7 = g_string_new(NULL);
+
+	for (p = mutf7_str; *p != '\0'; p++) {
+		/* replace: '&'  -> '+',
+			    "&-" -> '&',
+			    "+"  -> "+-",
+			    escaped ','  -> '/' */
+		if (!in_escape && *p == '&') {
+			if (*(p + 1) != '-') {
+				g_string_append_c(norm_utf7, '+');
+				in_escape = TRUE;
+			} else {
+				g_string_append_c(norm_utf7, '&');
+				p++;
+			}
+		} else if (!in_escape && *p == '+') {
+			g_string_append(norm_utf7, "+-");
+		} else if (in_escape && *p == ',') {
+			g_string_append_c(norm_utf7, '/');
+		} else if (in_escape && *p == '-') {
+			g_string_append_c(norm_utf7, '-');
+			in_escape = FALSE;
+		} else {
+			g_string_append_c(norm_utf7, *p);
+		}
+	}
+
+	/* somehow iconv() returns error when the last of the string is "+-" */
+	g_string_append_c(norm_utf7, '\n');
+	norm_utf7_p = norm_utf7->str;
+	norm_utf7_len = norm_utf7->len;
+	to_len = strlen(mutf7_str) * 5;
+	to_p = to_str = g_malloc(to_len + 1);
+
+	if (iconv(cd, (ICONV_CONST gchar **)&norm_utf7_p, &norm_utf7_len,
+		  &to_p, &to_len) == -1) {
+		g_warning(_("iconv cannot convert UTF-7 to %s\n"), CS_INTERNAL);
+		g_string_free(norm_utf7, TRUE);
+		g_free(to_str);
+		return g_strdup(mutf7_str);
+	}
+
+	/* second iconv() call for flushing */
+	iconv(cd, NULL, NULL, &to_p, &to_len);
+	g_string_free(norm_utf7, TRUE);
+	*to_p = '\0';
+	strretchomp(to_str);
+
+	return to_str;
+}
+
+static gchar *imap_utf8_to_modified_utf7(const gchar *from)
+{
+	static iconv_t cd = (iconv_t)-1;
+	static gboolean iconv_ok = TRUE;
+	gchar *norm_utf7, *norm_utf7_p;
+	size_t from_len, norm_utf7_len;
+	GString *to_str;
+	gchar *from_tmp, *to, *p;
+	gboolean in_escape = FALSE;
+
+	if (!iconv_ok) return g_strdup(from);
+
+	if (cd == (iconv_t)-1) {
+		cd = iconv_open(CS_UTF_7, CS_INTERNAL);
+		if (cd == (iconv_t)-1) {
+			g_warning(_("iconv cannot convert %s to UTF-7\n"),
+				  CS_INTERNAL);
+			iconv_ok = FALSE;
+			return g_strdup(from);
+		}
+	}
+
+	/* UTF-8 to normal UTF-7 conversion */
+	Xstrdup_a(from_tmp, from, return g_strdup(from));
+	from_len = strlen(from);
+	norm_utf7_len = from_len * 5;
+	Xalloca(norm_utf7, norm_utf7_len + 1, return g_strdup(from));
+	norm_utf7_p = norm_utf7;
+
+	while (from_len > 0) {
+		if (*from_tmp == '+') {
+			*norm_utf7_p++ = '+';
+			*norm_utf7_p++ = '-';
+			norm_utf7_len -= 2;
+			from_tmp++;
+			from_len--;
+		} else if (g_ascii_isprint(*from_tmp)) {
+			/* printable ascii char */
+			*norm_utf7_p = *from_tmp;
+			norm_utf7_p++;
+			norm_utf7_len--;
+			from_tmp++;
+			from_len--;
+		} else {
+			size_t conv_len = 0;
+
+			/* unprintable char: convert to UTF-7 */
+			p = from_tmp;
+			while (!g_ascii_isprint(*p) && conv_len < from_len) {
+				conv_len += g_utf8_skip[*(guchar *)p];
+				p += g_utf8_skip[*(guchar *)p];
+			}
+
+			from_len -= conv_len;
+			if (iconv(cd, (ICONV_CONST gchar **)&from_tmp,
+				  &conv_len,
+				  &norm_utf7_p, &norm_utf7_len) == -1) {
+				g_warning("iconv cannot convert %s to UTF-7\n",
+					  CS_INTERNAL);
+				return g_strdup(from);
+			}
+
+			/* second iconv() call for flushing */
+			iconv(cd, NULL, NULL, &norm_utf7_p, &norm_utf7_len);
+		}
+	}
+
+	*norm_utf7_p = '\0';
+	to_str = g_string_new(NULL);
+	for (p = norm_utf7; p < norm_utf7_p; p++) {
+		/* replace: '&' -> "&-",
+			    '+' -> '&',
+			    "+-" -> '+',
+			    BASE64 '/' -> ',' */
+		if (!in_escape && *p == '&') {
+			g_string_append(to_str, "&-");
+		} else if (!in_escape && *p == '+') {
+			if (*(p + 1) == '-') {
+				g_string_append_c(to_str, '+');
+				p++;
+			} else {
+				g_string_append_c(to_str, '&');
+				in_escape = TRUE;
+			}
+		} else if (in_escape && *p == '/') {
+			g_string_append_c(to_str, ',');
+		} else if (in_escape && *p == '-') {
+			g_string_append_c(to_str, '-');
+			in_escape = FALSE;
+		} else {
+			g_string_append_c(to_str, *p);
+		}
+	}
+
+	if (in_escape) {
+		in_escape = FALSE;
+		g_string_append_c(to_str, '-');
+	}
+
+	to = to_str->str;
+	g_string_free(to_str, FALSE);
+
+	return to;
+}
+
+static GSList *imap_get_seq_set_from_msglist(GSList *msglist)
+{
+	GString *str;
+	GSList *sorted_list, *cur;
+	guint first, last, next;
+	gchar *ret_str;
+	GSList *ret_list = NULL;
+
+	if (msglist == NULL)
+		return NULL;
+
+	str = g_string_sized_new(256);
+
+	sorted_list = g_slist_copy(msglist);
+	sorted_list = procmsg_sort_msg_list(sorted_list, SORT_BY_NUMBER,
+					    SORT_ASCENDING);
+
+	first = ((MsgInfo *)sorted_list->data)->msgnum;
+
+	for (cur = sorted_list; cur != NULL; cur = cur->next) {
+		last = ((MsgInfo *)cur->data)->msgnum;
+		if (cur->next)
+			next = ((MsgInfo *)cur->next->data)->msgnum;
+		else
+			next = 0;
+
+		if (last + 1 != next || next == 0) {
+			if (str->len > 0)
+				g_string_append_c(str, ',');
+			if (first == last)
+				g_string_sprintfa(str, "%u", first);
+			else
+				g_string_sprintfa(str, "%u:%u", first, last);
+
+			first = next;
+
+			if (str->len > IMAP_CMD_LIMIT) {
+				ret_str = g_strdup(str->str);
+				ret_list = g_slist_append(ret_list, ret_str);
+				g_string_truncate(str, 0);
+			}
+		}
+	}
+
+	if (str->len > 0) {
+		ret_str = g_strdup(str->str);
+		ret_list = g_slist_append(ret_list, ret_str);
+	}
+
+	g_slist_free(sorted_list);
+	g_string_free(str, TRUE);
+
+	return ret_list;
+}
+
+static void imap_seq_set_free(GSList *seq_list)
+{
+	slist_free_strings(seq_list);
+	g_slist_free(seq_list);
+}
+
+static GHashTable *imap_get_uid_table(GArray *array)
+{
+	GHashTable *table;
+	gint i;
+	guint32 uid;
+
+	g_return_val_if_fail(array != NULL, NULL);
+
+	table = g_hash_table_new(NULL, g_direct_equal);
+
+	for (i = 0; i < array->len; i++) {
+		uid = g_array_index(array, guint32, i);
+		g_hash_table_insert(table, GUINT_TO_POINTER(uid),
+				    GINT_TO_POINTER(i + 1));
+	}
+
+	return table;
+}
+
+static gboolean imap_rename_folder_func(GNode *node, gpointer data)
+{
+	FolderItem *item = node->data;
+	gchar **paths = data;
+	const gchar *oldpath = paths[0];
+	const gchar *newpath = paths[1];
+	gchar *base;
+	gchar *new_itempath;
+	gint oldpathlen;
+
+	oldpathlen = strlen(oldpath);
+	if (strncmp(oldpath, item->path, oldpathlen) != 0) {
+		g_warning("path doesn't match: %s, %s\n", oldpath, item->path);
+		return TRUE;
+	}
+
+	base = item->path + oldpathlen;
+	while (*base == G_DIR_SEPARATOR) base++;
+	if (*base == '\0')
+		new_itempath = g_strdup(newpath);
+	else
+		new_itempath = g_strconcat(newpath, G_DIR_SEPARATOR_S, base,
+					   NULL);
+	g_free(item->path);
+	item->path = new_itempath;
+
+	return FALSE;
+}