0.9.3claws68
[claws.git] / src / imap.c
index ac720e433bfa1bf2a6055ba44ea7491b92adff18..10ea45dcd4560c4bd1e92e92c225242352677d02 100644 (file)
 #  include <iconv.h>
 #endif
 
+#if USE_OPENSSL
+#  include "ssl.h"
+#endif
+#include "folder.h"
+#include "session.h"
+#include "procmsg.h"
 #include "intl.h"
 #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 "inputdialog.h"
 #include "log.h"
 
+typedef struct _IMAPFolder     IMAPFolder;
+typedef struct _IMAPSession    IMAPSession;
+typedef struct _IMAPNameSpace  IMAPNameSpace;
+typedef struct _IMAPFolderItem IMAPFolderItem;
+
+#include "prefs_account.h"
+
+#define IMAP_FOLDER(obj)       ((IMAPFolder *)obj)
+#define IMAP_SESSION(obj)      ((IMAPSession *)obj)
+
+struct _IMAPFolder
+{
+       RemoteFolder rfolder;
+
+       /* list of IMAPNameSpace */
+       GList *ns_personal;
+       GList *ns_others;
+       GList *ns_shared;
+};
+
+struct _IMAPSession
+{
+       Session session;
+
+       gchar **capability;
+       gchar *mbox;
+       time_t last_access_time;
+       gboolean authenticated;
+       guint cmd_count;
+       gboolean folder_content_changed;
+       guint exists;
+};
+
+struct _IMAPNameSpace
+{
+       gchar *name;
+       gchar separator;
+};
+
+#define IMAP_SUCCESS   0
+#define IMAP_SOCKET    2
+#define IMAP_AUTHFAIL  3
+#define IMAP_PROTOCOL  4
+#define IMAP_SYNTAX    5
+#define IMAP_IOERR     6
+#define IMAP_ERROR     7
+
+#define IMAPBUFSIZE    8192
+
+typedef enum
+{
+       IMAP_FLAG_SEEN          = 1 << 0,
+       IMAP_FLAG_ANSWERED      = 1 << 1,
+       IMAP_FLAG_FLAGGED       = 1 << 2,
+       IMAP_FLAG_DELETED       = 1 << 3,
+       IMAP_FLAG_DRAFT         = 1 << 4
+} IMAPFlags;
+
+#define IMAP_IS_SEEN(flags)    ((flags & IMAP_FLAG_SEEN) != 0)
+#define IMAP_IS_ANSWERED(flags)        ((flags & IMAP_FLAG_ANSWERED) != 0)
+#define IMAP_IS_FLAGGED(flags) ((flags & IMAP_FLAG_FLAGGED) != 0)
+#define IMAP_IS_DELETED(flags) ((flags & IMAP_FLAG_DELETED) != 0)
+#define IMAP_IS_DRAFT(flags)   ((flags & IMAP_FLAG_DRAFT) != 0)
+
+
 #define IMAP4_PORT     143
 #if USE_OPENSSL
 #define IMAPS_PORT     993
 #endif
 
+#define IMAP_CMD_LIMIT 1000
+
 #define QUOTE_IF_REQUIRED(out, str)                            \
 {                                                              \
        if (*str != '"' && strpbrk(str, " \t(){}%*") != NULL) { \
@@ -83,7 +156,7 @@ struct _IMAPFolderItem
 static Folder *imap_folder_new(const gchar * name, const gchar * path);
 static void imap_folder_destroy(Folder * folder);
 
-static Session *imap_session_new(const PrefsAccount * account);
+static IMAPSession *imap_session_new(const PrefsAccount * account);
 static void imap_session_authenticate(IMAPSession * session,
                                      const PrefsAccount * account);
 static void imap_session_destroy(Session * session);
@@ -91,10 +164,15 @@ static void imap_session_destroy(Session * session);
 static gchar *imap_fetch_msg(Folder * folder, FolderItem * item, gint uid);
 static gint imap_add_msg(Folder * folder,
                         FolderItem * dest,
-                        const gchar * file, gboolean remove_source);
+                        const gchar * file, MsgFlags * flags);
+static gint imap_add_msgs(Folder * folder, FolderItem * dest,
+                         GSList * file_list,
+                         GRelation *relation);
 
 static gint imap_copy_msg(Folder * folder,
                          FolderItem * dest, MsgInfo * msginfo);
+static gint imap_copy_msgs(Folder *folder, FolderItem *dest, 
+                   MsgInfoList *msglist, GRelation *relation);
 
 static gint imap_remove_msg(Folder * folder, FolderItem * item, gint uid);
 static gint imap_remove_all_msg(Folder * folder, FolderItem * item);
@@ -102,7 +180,8 @@ 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_scan_folder(Folder * folder, FolderItem * item);
+static gint imap_close(Folder * folder, FolderItem * item);
+
 static void imap_scan_tree(Folder * folder);
 
 static gint imap_create_tree(Folder * folder);
@@ -115,8 +194,6 @@ static gint imap_rename_folder(Folder * folder,
 static gint imap_remove_folder(Folder * folder, FolderItem * item);
 
 
-static gint imap_cmd_count = 0;
-
 static void imap_folder_init           (Folder         *folder,
                                         const gchar    *name,
                                         const gchar    *path);
@@ -127,9 +204,14 @@ static void imap_folder_item_destroy       (Folder         *folder,
 
 static IMAPSession *imap_session_get   (Folder         *folder);
 
+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         (Folder         *folder,
+static GSList *imap_parse_list         (IMAPFolder     *folder,
                                         IMAPSession    *session,
                                         const gchar    *real_path,
                                         gchar          *separator);
@@ -140,10 +222,10 @@ static FolderItem *imap_create_special_folder
                                         SpecialFolderItemType   stype,
                                         const gchar            *name);
 
-static gint imap_do_copy               (Folder         *folder,
+static gint imap_do_copy_msgs          (Folder         *folder,
                                         FolderItem     *dest,
-                                        MsgInfo        *msginfo,
-                                        gboolean        remove_source);
+                                        MsgInfoList    *msglist,
+                                        GRelation      *relation);
 
 static void imap_delete_all_cached_messages    (FolderItem     *item);
 
@@ -171,9 +253,10 @@ static SockInfo *imap_init_sock(SockInfo *sock, SSLType    ssl_type);
 static SockInfo *imap_init_sock(SockInfo *sock);
 #endif
 
+static gchar *imap_get_flag_str                (IMAPFlags       flags);
 static gint imap_set_message_flags     (IMAPSession    *session,
                                         MsgNumberList  *numlist,
-                                        IMAPFlags       flag,
+                                        IMAPFlags       flags,
                                         gboolean        is_set);
 static gint imap_select                        (IMAPSession    *session,
                                         IMAPFolder     *folder,
@@ -211,76 +294,81 @@ static MsgFlags imap_parse_flags  (const gchar    *flag_str);
 static MsgInfo *imap_parse_envelope    (SockInfo       *sock,
                                         FolderItem     *item,
                                         GString        *line_str);
-static gint imap_greeting              (SockInfo       *sock,
-                                        gboolean       *is_preauth);
-static void imap_get_capability                (Session        *session);
+static gint imap_greeting              (IMAPSession    *session);
 static gboolean imap_has_capability    (IMAPSession    *session,
                                         const gchar    *cap);
-static const IMAPSet numberlist_to_imapset(MsgNumberList *list);
+void imap_free_capabilities            (IMAPSession    *session);
 
 /* low-level IMAP4rev1 commands */
-static gint imap_cmd_login     (SockInfo       *sock,
+static gint imap_cmd_authenticate
+                               (IMAPSession    *session,
+                                const gchar    *user,
+                                const gchar    *pass,
+                                IMAPAuthType    type);
+static gint imap_cmd_login     (IMAPSession    *sock,
                                 const gchar    *user,
                                 const gchar    *pass);
-static gint imap_cmd_logout    (SockInfo       *sock);
-static gint imap_cmd_noop      (SockInfo       *sock);
-static gint imap_cmd_starttls  (SockInfo       *sock);
-static gint imap_cmd_namespace (SockInfo       *sock,
+static gint imap_cmd_logout    (IMAPSession    *sock);
+static gint imap_cmd_noop      (IMAPSession    *sock);
+static gint imap_cmd_starttls  (IMAPSession    *sock);
+static gint imap_cmd_namespace (IMAPSession    *sock,
                                 gchar         **ns_str);
-static gint imap_cmd_list      (SockInfo       *sock,
+static gint imap_cmd_list      (IMAPSession    *session,
                                 const gchar    *ref,
                                 const gchar    *mailbox,
                                 GPtrArray      *argbuf);
-static gint imap_cmd_do_select (SockInfo       *sock,
+static gint imap_cmd_do_select (IMAPSession    *sock,
                                 const gchar    *folder,
                                 gboolean        examine,
                                 gint           *exists,
                                 gint           *recent,
                                 gint           *unseen,
                                 guint32        *uid_validity);
-static gint imap_cmd_select    (SockInfo       *sock,
+static gint imap_cmd_select    (IMAPSession    *sock,
                                 const gchar    *folder,
                                 gint           *exists,
                                 gint           *recent,
                                 gint           *unseen,
                                 guint32        *uid_validity);
-static gint imap_cmd_examine   (SockInfo       *sock,
+static gint imap_cmd_examine   (IMAPSession    *sock,
                                 const gchar    *folder,
                                 gint           *exists,
                                 gint           *recent,
                                 gint           *unseen,
                                 guint32        *uid_validity);
-static gint imap_cmd_create    (SockInfo       *sock,
+static gint imap_cmd_create    (IMAPSession    *sock,
                                 const gchar    *folder);
-static gint imap_cmd_rename    (SockInfo       *sock,
+static gint imap_cmd_rename    (IMAPSession    *sock,
                                 const gchar    *oldfolder,
                                 const gchar    *newfolder);
-static gint imap_cmd_delete    (SockInfo       *sock,
+static gint imap_cmd_delete    (IMAPSession    *sock,
                                 const gchar    *folder);
-static gint imap_cmd_envelope  (SockInfo       *sock,
+static gint imap_cmd_envelope  (IMAPSession    *sock,
                                 IMAPSet         set);
-static gint imap_cmd_fetch     (SockInfo       *sock,
+static gint imap_cmd_fetch     (IMAPSession    *sock,
                                 guint32         uid,
                                 const gchar    *filename);
 static gint imap_cmd_append    (IMAPSession    *session,
                                 const gchar    *destfolder,
                                 const gchar    *file,
+                                IMAPFlags       flags,
                                 gint32         *newuid);
-static gint imap_cmd_copy      (IMAPSession    *session,
-                                gint32         msgnum,
-                                const gchar    *destfolder,
-                                gint32         *new_uid);
-static gint imap_cmd_store     (SockInfo       *sock,
+static gint imap_cmd_copy       (IMAPSession    *session, 
+                                 const gchar    *seq_set, 
+                                 const gchar    *destfolder,
+                                GRelation      *uid_mapping);
+static gint imap_cmd_store     (IMAPSession    *sock,
                                 IMAPSet         set,
                                 gchar          *sub_cmd);
-static gint imap_cmd_expunge   (SockInfo       *sock);
+static gint imap_cmd_expunge   (IMAPSession    *sock);
+static gint imap_cmd_close     (IMAPSession    *session);
 
-static gint imap_cmd_ok                (SockInfo       *sock,
+static gint imap_cmd_ok                (IMAPSession    *session,
                                 GPtrArray      *argbuf);
-static void imap_cmd_gen_send  (SockInfo       *sock,
+static void imap_gen_send      (IMAPSession    *sock,
                                 const gchar    *format, ...);
-static gint imap_cmd_gen_recv  (SockInfo       *sock,
-                                gchar         **buf);
+static gint imap_gen_recv      (IMAPSession    *sock,
+                                gchar         **ret);
 
 /* misc utility functions */
 static gchar *strchr_cpy                       (const gchar    *src,
@@ -301,6 +389,10 @@ static void imap_path_separator_subst              (gchar          *str,
 static gchar *imap_modified_utf7_to_locale     (const gchar    *mutf7_str);
 static gchar *imap_locale_to_modified_utf7     (const gchar    *from);
 
+static GSList *imap_get_seq_set_from_numlist    (MsgNumberList  *msglist);
+static GSList *imap_get_seq_set_from_msglist   (MsgInfoList    *msglist);
+static void imap_seq_set_free                   (GSList         *seq_list);
+
 static gboolean imap_rename_folder_func                (GNode          *node,
                                                 gpointer        data);
 static gint imap_get_num_list                  (Folder         *folder,
@@ -318,6 +410,9 @@ static void imap_change_flags                       (Folder         *folder,
                                                 FolderItem     *item,
                                                 MsgInfo        *msginfo,
                                                 MsgPermFlags   newflags);
+static gchar *imap_folder_get_path             (Folder         *folder);
+static gchar *imap_item_get_path               (Folder         *folder,
+                                                FolderItem     *item);
 
 FolderClass imap_class =
 {
@@ -334,9 +429,11 @@ FolderClass imap_class =
        /* FolderItem functions */
        imap_folder_item_new,
        imap_folder_item_destroy,
+       imap_item_get_path,
        imap_create_folder,
        imap_rename_folder,
        imap_remove_folder,
+       imap_close,
        imap_get_num_list,
        NULL,
        NULL,
@@ -348,14 +445,16 @@ FolderClass imap_class =
        imap_get_msginfos,
        imap_fetch_msg,
        imap_add_msg,
+       imap_add_msgs,
        imap_copy_msg,
+       imap_copy_msgs,
        imap_remove_msg,
        imap_remove_all_msg,
        imap_is_msg_changed,
        imap_change_flags,
 };
 
-FolderClass *imap_get_class()
+FolderClass *imap_get_class(void)
 {
        return &imap_class;
 }
@@ -375,7 +474,7 @@ void imap_folder_destroy(Folder *folder)
 {
        gchar *dir;
 
-       dir = folder_get_path(folder);
+       dir = imap_folder_get_path(folder);
        if (is_dir_exist(dir))
                remove_dir_recursive(dir);
        g_free(dir);
@@ -432,28 +531,27 @@ static void imap_reset_uid_lists(Folder *folder)
        g_node_traverse(folder->node, G_IN_ORDER, G_TRAVERSE_ALL, -1, imap_reset_uid_lists_func, NULL); 
 }
 
+static gint imap_auth(IMAPSession *session, const gchar *user, const gchar *pass,
+                     IMAPAuthType type)
+{
+       if (type == 0 || type == IMAP_AUTH_LOGIN)
+               return imap_cmd_login(session, user, pass);
+       else
+               return imap_cmd_authenticate(session, user, pass, type);
+}
+
 static IMAPSession *imap_session_get(Folder *folder)
 {
        RemoteFolder *rfolder = REMOTE_FOLDER(folder);
-       Session *session = NULL;
-       gushort port;
+       IMAPSession *session = NULL;
 
        g_return_val_if_fail(folder != NULL, NULL);
        g_return_val_if_fail(FOLDER_CLASS(folder) == &imap_class, NULL);
        g_return_val_if_fail(folder->account != NULL, NULL);
 
-#if USE_OPENSSL
-       port = folder->account->set_imapport ? folder->account->imapport
-               : folder->account->ssl_imap == SSL_TUNNEL
-               ? IMAPS_PORT : IMAP4_PORT;
-#else
-       port = folder->account->set_imapport ? folder->account->imapport
-               : IMAP4_PORT;
-#endif
-
        /* Make sure we have a session */
        if (rfolder->session != NULL) {
-               session = rfolder->session;
+               session = IMAP_SESSION(rfolder->session);
        } else {
                imap_reset_uid_lists(folder);
                session = imap_session_new(folder->account);
@@ -461,21 +559,18 @@ static IMAPSession *imap_session_get(Folder *folder)
        if(session == NULL)
                return NULL;
 
-       if (session->sock->state == CONN_DISCONNECTED) {
+       if (SESSION(session)->sock->state == CONN_DISCONNECTED) {
                debug_print("IMAP server disconnected\n");
-               session_destroy(session);
+               session_destroy(SESSION(session));
                imap_reset_uid_lists(folder);
                session = imap_session_new(folder->account);
-       }               
-
-       /* Get CAPABILITY */
-       imap_get_capability(session); 
+       }
 
        /* Make sure session is authenticated */
        if (!IMAP_SESSION(session)->authenticated)
                imap_session_authenticate(IMAP_SESSION(session), folder->account);
        if (!IMAP_SESSION(session)->authenticated) {
-               session_destroy(session);
+               session_destroy(SESSION(session));
                rfolder->session = NULL;
                return NULL;
        }
@@ -494,42 +589,41 @@ static IMAPSession *imap_session_get(Folder *folder)
         * successfully sent. -- mbp */
        if (time(NULL) - session->last_access_time > SESSION_TIMEOUT) {
                /* verify that the session is still alive */
-               if (imap_cmd_noop(session->sock) != IMAP_SUCCESS) {
+               if (imap_cmd_noop(session) != IMAP_SUCCESS) {
                        /* Check if this is the first try to establish a
                           connection, if yes we don't try to reconnect */
                        if (rfolder->session == NULL) {
-                               log_warning(_("Connecting %s:%d failed"),
-                                           folder->account->recv_server, port);
-                               session_destroy(session);
+                               log_warning(_("Connecting %s failed"),
+                                           folder->account->recv_server);
+                               session_destroy(SESSION(session));
                                session = NULL;
                        } else {
-                               log_warning(_("IMAP4 connection to %s:%d has been"
+                               log_warning(_("IMAP4 connection to %s has been"
                                              " disconnected. Reconnecting...\n"),
-                                           folder->account->recv_server, port);
-                               session_destroy(session);
+                                           folder->account->recv_server);
+                               session_destroy(SESSION(session));
                                /* Clear folders session to make imap_session_get create
                                   a new session, because of rfolder->session == NULL
                                   it will not try to reconnect again and so avoid an
                                   endless loop */
                                rfolder->session = NULL;
-                               session = SESSION(imap_session_get(folder));
+                               session = imap_session_get(folder);
                        }
                }
        }
 
-       rfolder->session = session;
+       rfolder->session = SESSION(session);
        if (session) {
                session->last_access_time = time(NULL);
        }
        return IMAP_SESSION(session);
 }
 
-Session *imap_session_new(const PrefsAccount *account)
+IMAPSession *imap_session_new(const PrefsAccount *account)
 {
        IMAPSession *session;
        SockInfo *imap_sock;
        gushort port;
-       gboolean is_preauth;
 
 #ifdef USE_OPENSSL
        /* FIXME: IMAP over SSL only... */ 
@@ -569,14 +663,6 @@ Session *imap_session_new(const PrefsAccount *account)
                        return NULL;
        }
 
-       /* Only need to log in if the connection was not PREAUTH */
-       if (imap_greeting(imap_sock, &is_preauth) != IMAP_SUCCESS) {
-               sock_close(imap_sock);
-               return NULL;
-       }
-       log_message("IMAP connection is %s-authenticated\n",
-                   (is_preauth) ? "pre" : "un");
-
        session = g_new0(IMAPSession, 1);
        session_init(SESSION(session));
        SESSION(session)->type             = SESSION_IMAP;
@@ -588,9 +674,44 @@ Session *imap_session_new(const PrefsAccount *account)
        session->capability = NULL;
 
        session->mbox = NULL;
-       session->authenticated = is_preauth;
+       session->authenticated = FALSE;
+       session->cmd_count = 0;
 
-       return SESSION(session);
+       /* Only need to log in if the connection was not PREAUTH */
+       if (imap_greeting(session) != IMAP_SUCCESS) {
+               session_destroy(SESSION(session));
+               return NULL;
+       }
+
+#if USE_OPENSSL
+       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"));
+                       session_destroy(SESSION(session));
+                       return NULL;
+               }
+               if (!ssl_init_socket_with_method(SESSION(session)->sock, SSL_METHOD_TLSv1)) {
+                       session_destroy(SESSION(session));
+                       return NULL;
+               }
+
+               imap_free_capabilities(session);
+               session->authenticated = FALSE;
+               session->cmd_count = 1;
+
+               if (imap_greeting(session) != IMAP_SUCCESS) {
+                       session_destroy(SESSION(session));
+                       return NULL;
+               }               
+       }
+#endif
+       log_message("IMAP connection is %s-authenticated\n",
+                   (session->authenticated) ? "pre" : "un");
+
+       return session;
 }
 
 void imap_session_authenticate(IMAPSession *session, const PrefsAccount *account)
@@ -609,8 +730,8 @@ void imap_session_authenticate(IMAPSession *session, const PrefsAccount *account
                g_free(tmp_pass);
        }
 
-       if (imap_cmd_login(SESSION(session)->sock, account->userid, pass) != IMAP_SUCCESS) {
-               imap_cmd_logout(SESSION(session)->sock);
+       if (imap_auth(session, account->userid, pass, account->imap_auth_type) != IMAP_SUCCESS) {
+               imap_cmd_logout(session);
                return;
        }
 
@@ -623,8 +744,7 @@ void imap_session_destroy(Session *session)
        session->sock = NULL;
 
        g_free(IMAP_SESSION(session)->mbox);
-
-       g_strfreev(IMAP_SESSION(session)->capability);
+       imap_free_capabilities(IMAP_SESSION(session));
 }
 
 gchar *imap_fetch_msg(Folder *folder, FolderItem *item, gint uid)
@@ -662,7 +782,7 @@ gchar *imap_fetch_msg(Folder *folder, FolderItem *item, gint uid)
        }
 
        debug_print("getting message %d...\n", uid);
-       ok = imap_cmd_fetch(SESSION(session)->sock, (guint32)uid, filename);
+       ok = imap_cmd_fetch(session, (guint32)uid, filename);
 
        if (ok != IMAP_SUCCESS) {
                g_warning("can't fetch message %d\n", uid);
@@ -673,115 +793,192 @@ gchar *imap_fetch_msg(Folder *folder, FolderItem *item, gint uid)
        return filename;
 }
 
-gint imap_add_msg(Folder *folder, FolderItem *dest, const gchar *file,
-                 gboolean remove_source)
+gint imap_add_msg(Folder *folder, FolderItem *dest, const gchar *file, MsgFlags *flags)
+{
+       gint ret;
+       GSList file_list;
+       MsgFileInfo fileinfo;
+
+       g_return_val_if_fail(file != NULL, -1);
+
+       fileinfo.msginfo = NULL;
+       fileinfo.file = (gchar *)file;
+       fileinfo.flags = flags;
+       file_list.data = &fileinfo;
+       file_list.next = NULL;
+
+       ret = imap_add_msgs(folder, dest, &file_list, NULL);
+       return ret;
+}
+
+gint imap_add_msgs(Folder *folder, FolderItem *dest, GSList *file_list,
+                  GRelation *relation)
 {
        gchar *destdir;
        IMAPSession *session;
-       gint ok, newuid;
+       guint32 last_uid = 0;
+       GSList *cur;
+       MsgFileInfo *fileinfo;
+       gint ok, newnum;
 
        g_return_val_if_fail(folder != NULL, -1);
        g_return_val_if_fail(dest != NULL, -1);
-       g_return_val_if_fail(file != NULL, -1);
+       g_return_val_if_fail(file_list != NULL, -1);
 
        session = imap_session_get(folder);
        if (!session) return -1;
 
        destdir = imap_get_real_path(IMAP_FOLDER(folder), dest->path);
-       ok = imap_cmd_append(session, destdir, file, &newuid);
-       g_free(destdir);
 
-       if (ok != IMAP_SUCCESS) {
-               g_warning("can't append message %s\n", file);
-               return -1;
-       }
+       for (cur = file_list; cur != NULL; cur = cur->next) {
+               IMAPFlags iflags = 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, &newnum);
 
-       if (remove_source) {
-               if (unlink(file) < 0)
-                       FILE_OP_ERROR(file, "unlink");
+               if (ok != IMAP_SUCCESS) {
+                       g_warning("can't append message %s\n", fileinfo->file);
+                       g_free(destdir);
+                       return -1;
+               }
+
+               if (relation != NULL)
+                       g_relation_insert(relation, fileinfo->msginfo != NULL ? 
+                                         fileinfo->msginfo : fileinfo,
+                                         GINT_TO_POINTER(dest->last_num + 1));
+               if (newnum > last_uid)
+                       last_uid = newnum;
        }
 
-       return newuid;
+       g_free(destdir);
+
+       return last_uid;
 }
 
-static gint imap_do_copy(Folder *folder, FolderItem *dest, MsgInfo *msginfo,
-                        gboolean remove_source)
+static gint imap_do_copy_msgs(Folder *folder, FolderItem *dest, 
+                             MsgInfoList *msglist, GRelation *relation)
 {
        gchar *destdir;
+       GSList *seq_list, *cur;
+       MsgInfo *msginfo;
        IMAPSession *session;
-       guint32 newuid = 0;
-       gint ok;
+       gint ok = IMAP_SUCCESS;
+       GRelation *uid_mapping;
+       gint last_num = 0;
        
        g_return_val_if_fail(folder != NULL, -1);
-       g_return_val_if_fail(FOLDER_CLASS(folder) == &imap_class, -1);
        g_return_val_if_fail(dest != NULL, -1);
-       g_return_val_if_fail(msginfo != NULL, -1);
+       g_return_val_if_fail(msglist != NULL, -1);
 
        session = imap_session_get(folder);
        if (!session) return -1;
 
+       msginfo = (MsgInfo *)msglist->data;
        if (msginfo->folder == dest) {
                g_warning("the src folder is identical to the dest.\n");
                return -1;
        }
 
        destdir = imap_get_real_path(IMAP_FOLDER(folder), dest->path);
+       seq_list = imap_get_seq_set_from_msglist(msglist);
+       uid_mapping = g_relation_new(2);
+       g_relation_index(uid_mapping, 0, g_direct_hash, g_direct_equal);
+       
+       for (cur = seq_list; cur != NULL; cur = g_slist_next(cur)) {
+               gchar *seq_set = (gchar *)cur->data;
 
-       /* ensure source folder selected */
-       ok = imap_select(session, IMAP_FOLDER(folder), msginfo->folder->path,
-                        NULL, NULL, NULL, NULL);
-       if (ok != IMAP_SUCCESS)
-               return -1;
-        
-       if (remove_source)
-               debug_print("Moving message %s%c%d to %s ...\n",
-                           msginfo->folder->path, G_DIR_SEPARATOR,
-                           msginfo->msgnum, destdir);
-       else
-               debug_print("Copying message %s%c%d to %s ...\n",
+               debug_print("Copying message %s%c[%s] to %s ...\n",
                            msginfo->folder->path, G_DIR_SEPARATOR,
-                           msginfo->msgnum, destdir);
+                           seq_set, destdir);
 
-       ok = imap_cmd_copy(session, msginfo->msgnum, destdir, &newuid);
-
-       if (ok == IMAP_SUCCESS && remove_source) {
-               MsgNumberList numlist;
+               ok = imap_cmd_copy(session, seq_set, destdir, uid_mapping);
+               if (ok != IMAP_SUCCESS) {
+                       g_relation_destroy(uid_mapping);
+                       imap_seq_set_free(seq_list);
+                       return -1;
+               }
+       }
 
-               numlist.next = NULL;
-               numlist.data = GINT_TO_POINTER(msginfo->msgnum);
+       for (cur = msglist; cur != NULL; cur = g_slist_next(cur)) {
+               MsgInfo *msginfo = (MsgInfo *)cur->data;
+               GTuples *tuples;
                
-               imap_set_message_flags(session, &numlist,
-                                      IMAP_FLAG_DELETED, TRUE);
-               ok = imap_cmd_expunge(SESSION(session)->sock);
+               tuples = g_relation_select(uid_mapping, 
+                                          GINT_TO_POINTER(msginfo->msgnum),
+                                          0);
+               if (tuples->len > 0) {
+                       gint num = GPOINTER_TO_INT(g_tuples_index(tuples, 0, 1));
+                       g_relation_insert(relation, msginfo,
+                                         GPOINTER_TO_INT(num));
+                       if (num > last_num)
+                               last_num = num;
+               } else
+                       g_relation_insert(relation, msginfo,
+                                         GPOINTER_TO_INT(0));
+               g_tuples_destroy(tuples);
        }
+       
+       imap_seq_set_free(seq_list);
 
        g_free(destdir);
 
        if (ok == IMAP_SUCCESS)
-               return newuid;
+               return last_num;
        else
                return -1;
 }
 
 gint imap_copy_msg(Folder *folder, FolderItem *dest, MsgInfo *msginfo)
 {
-       gchar *srcfile;
-       gint ret = 0;
+       GSList msglist;
+
+       g_return_val_if_fail(msginfo != NULL, -1);
+
+       msglist.data = msginfo;
+       msglist.next = NULL;
+
+       return imap_copy_msgs(folder, dest, &msglist, NULL);
+}
+
+gint imap_copy_msgs(Folder *folder, FolderItem *dest, 
+                   MsgInfoList *msglist, GRelation *relation)
+{
+       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(msginfo != 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(folder, dest, msginfo, FALSE);
+               return imap_do_copy_msgs(folder, dest, msglist, relation);
 
-       srcfile = procmsg_get_message_file(msginfo);
-       if (!srcfile) return -1;
+       file_list = procmsg_get_message_file_list(msglist);
+       g_return_val_if_fail(file_list != NULL, -1);
 
-       ret = imap_add_msg(folder, dest, srcfile, FALSE);
+       ret = imap_add_msgs(folder, dest, file_list, relation);
 
-       g_free(srcfile);
+       procmsg_message_file_list_free(file_list);
 
        return ret;
 }
@@ -816,7 +1013,7 @@ gint imap_remove_msg(Folder *folder, FolderItem *item, gint uid)
                return ok;
        }
 
-       ok = imap_cmd_expunge(SESSION(session)->sock);
+       ok = imap_cmd_expunge(session);
        if (ok != IMAP_SUCCESS) {
                log_warning(_("can't expunge\n"));
                return ok;
@@ -851,15 +1048,15 @@ gint imap_remove_all_msg(Folder *folder, FolderItem *item)
        if (exists == 0)
                return IMAP_SUCCESS;
 
-       imap_cmd_gen_send(SESSION(session)->sock,
-                         "STORE 1:%d +FLAGS (\\Deleted)", exists);
-       ok = imap_cmd_ok(SESSION(session)->sock, NULL);
+       imap_gen_send(session,
+                     "STORE 1:%d +FLAGS.SILENT (\\Deleted)", exists);
+       ok = imap_cmd_ok(session, NULL);
        if (ok != IMAP_SUCCESS) {
                log_warning(_("can't set deleted flags: 1:%d\n"), exists);
                return ok;
        }
 
-       ok = imap_cmd_expunge(SESSION(session)->sock);
+       ok = imap_cmd_expunge(session);
        if (ok != IMAP_SUCCESS) {
                log_warning(_("can't expunge\n"));
                return ok;
@@ -879,28 +1076,26 @@ gboolean imap_is_msg_changed(Folder *folder, FolderItem *item, MsgInfo *msginfo)
        return FALSE;
 }
 
-gint imap_scan_folder(Folder *folder, FolderItem *item)
+gint imap_close(Folder *folder, FolderItem *item)
 {
-       IMAPSession *session;
-       gint messages, recent, unseen;
-       guint32 uid_next, uid_validity;
        gint ok;
+       IMAPSession *session;
 
        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;
+       if (session->mbox) {
+               ok = imap_cmd_close(session);
+               if (ok != IMAP_SUCCESS)
+                       log_warning(_("can't close folder\n"));
+
+               g_free(session->mbox);
+               session->mbox = NULL;
 
-       item->new_msgs = unseen > 0 ? recent : 0;
-       item->unread_msgs = unseen;
-       item->total_msgs = messages;
-       item->last_num = (messages > 0 && uid_next > 0) ? uid_next - 1 : 0;
-       /* item->mtime = uid_validity; */
+               return ok;
+       }
 
        return 0;
 }
@@ -979,11 +1174,11 @@ static gint imap_scan_tree_recursive(IMAPSession *session, FolderItem *item)
                  {g_free(real_path); return IMAP_ERROR;});
        QUOTE_IF_REQUIRED(wildcard_path, wildcard_path);
 
-       imap_cmd_gen_send(SESSION(session)->sock, "LIST \"\" %s",
-                         wildcard_path);
+       imap_gen_send(session, "LIST \"\" %s",
+                     wildcard_path);
 
        strtailchomp(real_path, separator);
-       item_list = imap_parse_list(folder, session, real_path, NULL);
+       item_list = imap_parse_list(imapfolder, session, real_path, NULL);
        g_free(real_path);
 
        for (cur = item_list; cur != NULL; cur = cur->next) {
@@ -1016,8 +1211,6 @@ static gint imap_scan_tree_recursive(IMAPSession *session, FolderItem *item)
                        }
                }
                folder_item_append(item, new_item);
-               if (new_item->no_select == FALSE)
-                       imap_scan_folder(folder, new_item);
                if (new_item->no_sub == FALSE)
                        imap_scan_tree_recursive(session, new_item);
        }
@@ -1025,7 +1218,7 @@ static gint imap_scan_tree_recursive(IMAPSession *session, FolderItem *item)
        return IMAP_SUCCESS;
 }
 
-static GSList *imap_parse_list(Folder *folder, IMAPSession *session,
+static GSList *imap_parse_list(IMAPFolder *folder, IMAPSession *session,
                               const gchar *real_path, gchar *separator)
 {
        gchar buf[IMAPBUFSIZE];
@@ -1092,7 +1285,7 @@ static GSList *imap_parse_list(Folder *folder, IMAPSession *session,
 
                loc_name = imap_modified_utf7_to_locale(name);
                loc_path = imap_modified_utf7_to_locale(buf);
-               new_item = folder_item_new(folder, loc_name, loc_path);
+               new_item = folder_item_new(FOLDER(folder), loc_name, loc_path);
                if (strcasestr(flags, "\\Noinferiors") != NULL)
                        new_item->no_sub = TRUE;
                if (strcmp(buf, "INBOX") != 0 &&
@@ -1178,6 +1371,52 @@ static FolderItem *imap_create_special_folder(Folder *folder,
        return new_item;
 }
 
+static gchar *imap_folder_get_path(Folder *folder)
+{
+       gchar *folder_path;
+
+       g_return_val_if_fail(folder != NULL, NULL);
+        g_return_val_if_fail(folder->account != NULL, NULL);
+
+        folder_path = g_strconcat(get_imap_cache_dir(),
+                                  G_DIR_SEPARATOR_S,
+                                  folder->account->recv_server,
+                                  G_DIR_SEPARATOR_S,
+                                  folder->account->userid,
+                                  NULL);
+
+       return folder_path;
+}
+
+static gchar *imap_item_get_path(Folder *folder, FolderItem *item)
+{
+       gchar *folder_path, *path;
+
+       g_return_val_if_fail(folder != NULL, NULL);
+       g_return_val_if_fail(item != NULL, NULL);
+       folder_path = imap_folder_get_path(folder);
+
+       g_return_val_if_fail(folder_path != NULL, NULL);
+        if (folder_path[0] == G_DIR_SEPARATOR) {
+                if (item->path)
+                        path = g_strconcat(folder_path, G_DIR_SEPARATOR_S,
+                                           item->path, NULL);
+                else
+                        path = g_strdup(folder_path);
+        } else {
+                if (item->path)
+                        path = g_strconcat(get_home_dir(), G_DIR_SEPARATOR_S,
+                                           folder_path, G_DIR_SEPARATOR_S,
+                                           item->path, NULL);
+                else
+                        path = g_strconcat(get_home_dir(), G_DIR_SEPARATOR_S,
+                                           folder_path, NULL);
+        }
+        g_free(folder_path);
+
+       return path;
+}
+
 FolderItem *imap_create_folder(Folder *folder, FolderItem *parent,
                               const gchar *name)
 {
@@ -1228,7 +1467,7 @@ FolderItem *imap_create_folder(Folder *folder, FolderItem *parent,
                gboolean exist = FALSE;
 
                argbuf = g_ptr_array_new();
-               ok = imap_cmd_list(SESSION(session)->sock, NULL, imap_path,
+               ok = imap_cmd_list(session, NULL, imap_path,
                                   argbuf);
                if (ok != IMAP_SUCCESS) {
                        log_warning(_("can't create mailbox: LIST failed\n"));
@@ -1251,7 +1490,7 @@ FolderItem *imap_create_folder(Folder *folder, FolderItem *parent,
                g_ptr_array_free(argbuf, TRUE);
 
                if (!exist) {
-                       ok = imap_cmd_create(SESSION(session)->sock, imap_path);
+                       ok = imap_cmd_create(session, imap_path);
                        if (ok != IMAP_SUCCESS) {
                                log_warning(_("can't create mailbox\n"));
                                g_free(imap_path);
@@ -1302,7 +1541,7 @@ gint imap_rename_folder(Folder *folder, FolderItem *item, const gchar *name)
 
        g_free(session->mbox);
        session->mbox = NULL;
-       ok = imap_cmd_examine(SESSION(session)->sock, "INBOX",
+       ok = imap_cmd_examine(session, "INBOX",
                              &exists, &recent, &unseen, &uid_validity);
        if (ok != IMAP_SUCCESS) {
                g_free(real_oldpath);
@@ -1320,7 +1559,7 @@ gint imap_rename_folder(Folder *folder, FolderItem *item, const gchar *name)
        real_newpath = imap_locale_to_modified_utf7(newpath);
        imap_path_separator_subst(real_newpath, separator);
 
-       ok = imap_cmd_rename(SESSION(session)->sock, real_oldpath, real_newpath);
+       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);
@@ -1377,14 +1616,14 @@ gint imap_remove_folder(Folder *folder, FolderItem *item)
 
        path = imap_get_real_path(IMAP_FOLDER(folder), item->path);
 
-       ok = imap_cmd_examine(SESSION(session)->sock, "INBOX",
+       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(session)->sock, path);
+       ok = imap_cmd_delete(session, path);
        if (ok != IMAP_SUCCESS) {
                log_warning(_("can't delete mailbox\n"));
                g_free(path);
@@ -1410,64 +1649,72 @@ static GSList *imap_get_uncached_messages(IMAPSession *session,
        GSList *llast = NULL;
        GString *str;
        MsgInfo *msginfo;
+       GSList *seq_list, *cur;
+       IMAPSet imapset;
 
        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_CLASS(item->folder) == &imap_class, NULL);
 
-       if (imap_cmd_envelope(SESSION(session)->sock, numberlist_to_imapset(numlist))
-           != IMAP_SUCCESS) {
-               log_warning(_("can't get envelope\n"));
-               return NULL;
-       }
+       seq_list = imap_get_seq_set_from_numlist(numlist);
+       for (cur = seq_list; cur != NULL; cur = g_slist_next(cur)) {
+               imapset = cur->data;
 
-       str = g_string_new(NULL);
-
-       for (;;) {
-               if ((tmp = sock_getline(SESSION(session)->sock)) == NULL) {
-                       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 (imap_cmd_envelope(session, imapset)
+                   != IMAP_SUCCESS) {
+                       log_warning(_("can't get envelope\n"));
+                       continue;
                }
-               if (strstr(tmp, "FETCH") == NULL) {
+
+               str = g_string_new(NULL);
+
+               for (;;) {
+                       if ((tmp = sock_getline(SESSION(session)->sock)) == NULL) {
+                               log_warning(_("error occurred while getting envelope.\n"));
+                               g_string_free(str, TRUE);
+                               break;
+                       }
+                       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);
-                       continue;
-               }
-               log_print("IMAP4< %s\n", tmp);
-               g_string_assign(str, tmp);
-               g_free(tmp);
-
-               msginfo = imap_parse_envelope
-                       (SESSION(session)->sock, item, str);
-               if (!msginfo) {
-                       log_warning(_("can't parse envelope: %s\n"), str->str);
-                       continue;
-               }
-               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;
+                       msginfo = imap_parse_envelope
+                               (SESSION(session)->sock, item, str);
+                       if (!msginfo) {
+                               log_warning(_("can't parse envelope: %s\n"), str->str);
+                               continue;
+                       }
+                       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 (!newlist)
+                               llast = newlist = g_slist_append(newlist, msginfo);
+                       else {
+                               llast = g_slist_append(llast, msginfo);
+                               llast = llast->next;
+                       }
                }
-       }
 
-       g_string_free(str, TRUE);
+               g_string_free(str, TRUE);
+       }
+       imap_seq_set_free(seq_list);
 
        return newlist;
 }
@@ -1536,10 +1783,8 @@ static SockInfo *imap_open(const gchar *server, gushort port)
                sock_close(sock);
                return NULL;
        }
-       return imap_init_sock(sock, ssl_type);
-#else
-       return imap_init_sock(sock);
 #endif
+       return sock;
 }
 
 #if USE_OPENSSL
@@ -1548,23 +1793,6 @@ static SockInfo *imap_init_sock(SockInfo *sock, SSLType ssl_type)
 static SockInfo *imap_init_sock(SockInfo *sock)
 #endif
 {
-       imap_cmd_count = 0;
-#if USE_OPENSSL
-       if (ssl_type == SSL_STARTTLS) {
-               gint ok;
-
-               ok = imap_cmd_starttls(sock);
-               if (ok != IMAP_SUCCESS) {
-                       log_warning(_("Can't start TLS session.\n"));
-                       sock_close(sock);
-                       return NULL;
-               }
-               if (!ssl_init_socket_with_method(sock, SSL_METHOD_TLSv1)) {
-                       sock_close(sock);
-                       return NULL;
-               }
-       }
-#endif
 
        return sock;
 }
@@ -1638,7 +1866,7 @@ static void imap_parse_namespace(IMAPSession *session, IMAPFolder *folder)
                return;
        }
        
-       if (imap_cmd_namespace(SESSION(session)->sock, &ns_str)
+       if (imap_cmd_namespace(session, &ns_str)
            != IMAP_SUCCESS) {
                log_warning(_("can't get namespace\n"));
                return;
@@ -1674,8 +1902,8 @@ static void imap_get_namespace_by_list(IMAPSession *session, IMAPFolder *folder)
            folder->ns_shared   != NULL)
                return;
 
-       imap_cmd_gen_send(SESSION(session)->sock, "LIST \"\" \"\"");
-       item_list = imap_parse_list(NULL, session, "", &separator);
+       imap_gen_send(session, "LIST \"\" \"\"");
+       item_list = imap_parse_list(folder, session, "", &separator);
        for (cur = item_list; cur != NULL; cur = cur->next)
                folder_item_destroy(FOLDER_ITEM(cur->data));
        g_slist_free(item_list);
@@ -1791,6 +2019,7 @@ static gchar *imap_parse_atom(SockInfo *sock, gchar *src,
 
                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;
@@ -1833,6 +2062,7 @@ static gchar *imap_get_header(SockInfo *sock, gchar *cur_pos, gchar **headers,
 
        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;
@@ -1995,30 +2225,52 @@ static MsgInfo *imap_parse_envelope(SockInfo *sock, FolderItem *item,
        return msginfo;
 }
 
+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,
                                   MsgNumberList *numlist,
                                   IMAPFlags flags,
                                   gboolean is_set)
 {
-       GString *buf;
+       gchar *cmd;
+       gchar *flag_str;
        gint ok;
+       GSList *seq_list, *cur;
+       IMAPSet imapset;
 
-       buf = g_string_new(is_set ? "+FLAGS (" : "-FLAGS (");
-
-       if (IMAP_IS_SEEN(flags))        g_string_append(buf, "\\Seen ");
-       if (IMAP_IS_ANSWERED(flags))    g_string_append(buf, "\\Answered ");
-       if (IMAP_IS_FLAGGED(flags))     g_string_append(buf, "\\Flagged ");
-       if (IMAP_IS_DELETED(flags))     g_string_append(buf, "\\Deleted ");
-       if (IMAP_IS_DRAFT(flags))       g_string_append(buf, "\\Draft");
+       flag_str = imap_get_flag_str(flags);
+       cmd = g_strconcat(is_set ? "+FLAGS.SILENT (" : "-FLAGS.SILENT (",
+                         flag_str, ")", NULL);
+       g_free(flag_str);
 
-       if (buf->str[buf->len - 1] == ' ')
-               g_string_truncate(buf, buf->len - 1);
+       seq_list = imap_get_seq_set_from_numlist(numlist);
+       for (cur = seq_list; cur != NULL; cur = g_slist_next(cur)) {
+               imapset = cur->data;
 
-       g_string_append_c(buf, ')');
-
-       ok = imap_cmd_store(SESSION(session)->sock, numberlist_to_imapset(numlist),
-                           buf->str);
-       g_string_free(buf, TRUE);
+               ok = imap_cmd_store(session, imapset, cmd);
+       }
+       imap_seq_set_free(seq_list);
+       g_free(cmd);
 
        return ok;
 }
@@ -2045,12 +2297,14 @@ static gint imap_select(IMAPSession *session, IMAPFolder *folder,
        session->mbox = NULL;
 
        real_path = imap_get_real_path(folder, path);
-       ok = imap_cmd_select(SESSION(session)->sock, real_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
+       else {
                session->mbox = g_strdup(path);
+               session->folder_content_changed = FALSE;
+       }
        g_free(real_path);
 
        return ok;
@@ -2076,11 +2330,11 @@ static gint imap_status(IMAPSession *session, IMAPFolder *folder,
 
        real_path = imap_get_real_path(folder, path);
        QUOTE_IF_REQUIRED(real_path_, real_path);
-       imap_cmd_gen_send(SESSION(session)->sock, "STATUS %s "
-                         "(MESSAGES RECENT UIDNEXT UIDVALIDITY UNSEEN)",
-                         real_path_);
+       imap_gen_send(session, "STATUS %s "
+                     "(MESSAGES RECENT UIDNEXT UIDVALIDITY UNSEEN)",
+                     real_path_);
 
-       ok = imap_cmd_ok(SESSION(session)->sock, argbuf);
+       ok = imap_cmd_ok(session, argbuf);
        if (ok != IMAP_SUCCESS) THROW(ok);
 
        str = search_array_str(argbuf, "STATUS");
@@ -2126,7 +2380,52 @@ catch:
 
 /* low-level IMAP4rev1 commands */
 
-static gint imap_cmd_login(SockInfo *sock,
+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;
+
+       auth_type = "CRAM-MD5";
+
+       imap_gen_send(session, "AUTHENTICATE %s", auth_type);
+       ok = imap_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_;
@@ -2134,57 +2433,40 @@ static gint imap_cmd_login(SockInfo *sock,
 
        QUOTE_IF_REQUIRED(user_, user);
        QUOTE_IF_REQUIRED(pass_, pass);
-       imap_cmd_gen_send(sock, "LOGIN %s %s", user_, pass_);
+       imap_gen_send(session, "LOGIN %s %s", user_, pass_);
 
-       ok = imap_cmd_ok(sock, NULL);
+       ok = imap_cmd_ok(session, NULL);
        if (ok != IMAP_SUCCESS)
                log_warning(_("IMAP4 login failed.\n"));
 
        return ok;
 }
 
-static gint imap_cmd_logout(SockInfo *sock)
-{
-       imap_cmd_gen_send(sock, "LOGOUT");
-       return imap_cmd_ok(sock, NULL);
-}
-
-/* Send a NOOP, and examine the server's response to see whether this
- * connection is pre-authenticated or not. */
-static gint imap_greeting(SockInfo *sock, gboolean *is_preauth)
+static gint imap_cmd_logout(IMAPSession *session)
 {
-       GPtrArray *argbuf;
-       gint r;
-
-       imap_cmd_gen_send(sock, "NOOP");
-       argbuf = g_ptr_array_new(); /* will hold messages sent back */
-       r = imap_cmd_ok(sock, argbuf);
-       *is_preauth = search_array_str(argbuf, "PREAUTH") != NULL;
-
-       ptr_array_free_strings(argbuf);
-       g_ptr_array_free(argbuf, TRUE);
-       
-       return r;
+       imap_gen_send(session, "LOGOUT");
+       return imap_cmd_ok(session, NULL);
 }
 
-static void imap_get_capability(Session *session)
+/* Send CAPABILITY, and examine the server's response to see whether this
+ * connection is pre-authenticated or not and build a list of CAPABILITIES. */
+static gint imap_greeting(IMAPSession *session)
 {
        gchar *capstr;
        GPtrArray *argbuf;
 
-       if (IMAP_SESSION(session)->capability != NULL)
-               return;
-
-       imap_cmd_gen_send(session->sock, "CAPABILITY");
+       imap_gen_send(session, "CAPABILITY");
        
        argbuf = g_ptr_array_new();
 
-       if (imap_cmd_ok(session->sock, argbuf) != IMAP_SUCCESS ||
+       if (imap_cmd_ok(session, argbuf) != IMAP_SUCCESS ||
            ((capstr = search_array_str(argbuf, "CAPABILITY ")) == NULL)) {
                ptr_array_free_strings(argbuf);
                g_ptr_array_free(argbuf, TRUE);
-               return;
+               return -1;
        }
+
+       session->authenticated = search_array_str(argbuf, "PREAUTH") != NULL;
        
        capstr += strlen("CAPABILITY ");
 
@@ -2192,6 +2474,8 @@ static void imap_get_capability(Session *session)
        
        ptr_array_free_strings(argbuf);
        g_ptr_array_free(argbuf, TRUE);
+
+       return 0;
 }
 
 static gboolean imap_has_capability(IMAPSession *session, const gchar *cap)
@@ -2205,63 +2489,27 @@ static gboolean imap_has_capability(IMAPSession *session, const gchar *cap)
        return FALSE;
 }
 
-static const IMAPSet numberlist_to_imapset(MsgNumberList *list)
+void imap_free_capabilities(IMAPSession *session)
 {
-       static GString *imapset = NULL;
-       MsgNumberList *numlist, *elem;
-       guint first, last, next;
-
-       if (imapset == NULL)
-               imapset = g_string_sized_new(256);
-       else
-               g_string_truncate(imapset, 0);
-
-       numlist = g_slist_copy(list);
-       numlist = g_slist_sort(numlist, g_int_compare);
-
-       first = GPOINTER_TO_INT(numlist->data);
-       last = first;
-       for(elem = g_slist_next(numlist); elem != NULL; elem = g_slist_next(elem)) {
-               next = GPOINTER_TO_INT(elem->data);
-               if(next != (last + 1)) {
-                       if (imapset->len > 0)
-                               g_string_append(imapset, ",");
-                       if (first == last)
-                               g_string_sprintfa(imapset, "%d", first);
-                       else
-                               g_string_sprintfa(imapset, "%d:%d", first, last);
-
-                       first = next;
-               }
-               last = next;
-       }
-       if (imapset->len > 0)
-               g_string_append(imapset, ",");
-       if (first == last)
-               g_string_sprintfa(imapset, "%d", first);
-       else
-               g_string_sprintfa(imapset, "%d:%d", first, last);
-
-       g_slist_free(numlist);
-
-       return imapset->str;
+       g_strfreev(session->capability);
+       session->capability = NULL;
 }
 
-static gint imap_cmd_noop(SockInfo *sock)
+static gint imap_cmd_noop(IMAPSession *session)
 {
-       imap_cmd_gen_send(sock, "NOOP");
-       return imap_cmd_ok(sock, NULL);
+       imap_gen_send(session, "NOOP");
+       return imap_cmd_ok(session, NULL);
 }
 
-static gint imap_cmd_starttls(SockInfo *sock)
+static gint imap_cmd_starttls(IMAPSession *session)
 {
-       imap_cmd_gen_send(sock, "STARTTLS");
-       return imap_cmd_ok(sock, NULL);
+       imap_gen_send(session, "STARTTLS");
+       return imap_cmd_ok(session, NULL);
 }
 
 #define THROW(err) { ok = err; goto catch; }
 
-static gint imap_cmd_namespace(SockInfo *sock, gchar **ns_str)
+static gint imap_cmd_namespace(IMAPSession *session, gchar **ns_str)
 {
        gint ok;
        GPtrArray *argbuf;
@@ -2269,8 +2517,8 @@ static gint imap_cmd_namespace(SockInfo *sock, gchar **ns_str)
 
        argbuf = g_ptr_array_new();
 
-       imap_cmd_gen_send(sock, "NAMESPACE");
-       if ((ok = imap_cmd_ok(sock, argbuf)) != IMAP_SUCCESS) THROW(ok);
+       imap_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);
@@ -2286,7 +2534,7 @@ catch:
 
 #undef THROW
 
-static gint imap_cmd_list(SockInfo *sock, const gchar *ref,
+static gint imap_cmd_list(IMAPSession *session, const gchar *ref,
                          const gchar *mailbox, GPtrArray *argbuf)
 {
        gchar *ref_, *mailbox_;
@@ -2296,14 +2544,14 @@ static gint imap_cmd_list(SockInfo *sock, const gchar *ref,
 
        QUOTE_IF_REQUIRED(ref_, ref);
        QUOTE_IF_REQUIRED(mailbox_, mailbox);
-       imap_cmd_gen_send(sock, "LIST %s %s", ref_, mailbox_);
+       imap_gen_send(session, "LIST %s %s", ref_, mailbox_);
 
-       return imap_cmd_ok(sock, argbuf);
+       return imap_cmd_ok(session, argbuf);
 }
 
 #define THROW goto catch
 
-static gint imap_cmd_do_select(SockInfo *sock, const gchar *folder,
+static gint imap_cmd_do_select(IMAPSession *session, const gchar *folder,
                               gboolean examine,
                               gint *exists, gint *recent, gint *unseen,
                               guint32 *uid_validity)
@@ -2323,9 +2571,9 @@ static gint imap_cmd_do_select(SockInfo *sock, const gchar *folder,
                select_cmd = "SELECT";
 
        QUOTE_IF_REQUIRED(folder_, folder);
-       imap_cmd_gen_send(sock, "%s %s", select_cmd, folder_);
+       imap_gen_send(session, "%s %s", select_cmd, folder_);
 
-       if ((ok = imap_cmd_ok(sock, argbuf)) != IMAP_SUCCESS) THROW;
+       if ((ok = imap_cmd_ok(session, argbuf)) != IMAP_SUCCESS) THROW;
 
        resp_str = search_array_contain_str(argbuf, "EXISTS");
        if (resp_str) {
@@ -2367,57 +2615,57 @@ catch:
        return ok;
 }
 
-static gint imap_cmd_select(SockInfo *sock, const gchar *folder,
+static gint imap_cmd_select(IMAPSession *session, const gchar *folder,
                            gint *exists, gint *recent, gint *unseen,
                            guint32 *uid_validity)
 {
-       return imap_cmd_do_select(sock, folder, FALSE,
+       return imap_cmd_do_select(session, folder, FALSE,
                                  exists, recent, unseen, uid_validity);
 }
 
-static gint imap_cmd_examine(SockInfo *sock, const gchar *folder,
+static gint imap_cmd_examine(IMAPSession *session, const gchar *folder,
                             gint *exists, gint *recent, gint *unseen,
                             guint32 *uid_validity)
 {
-       return imap_cmd_do_select(sock, folder, TRUE,
+       return imap_cmd_do_select(session, folder, TRUE,
                                  exists, recent, unseen, uid_validity);
 }
 
 #undef THROW
 
-static gint imap_cmd_create(SockInfo *sock, const gchar *folder)
+static gint imap_cmd_create(IMAPSession *session, const gchar *folder)
 {
        gchar *folder_;
 
        QUOTE_IF_REQUIRED(folder_, folder);
-       imap_cmd_gen_send(sock, "CREATE %s", folder_);
+       imap_gen_send(session, "CREATE %s", folder_);
 
-       return imap_cmd_ok(sock, NULL);
+       return imap_cmd_ok(session, NULL);
 }
 
-static gint imap_cmd_rename(SockInfo *sock, const gchar *old_folder,
+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(sock, "RENAME %s %s", old_folder_, new_folder_);
+       imap_gen_send(session, "RENAME %s %s", old_folder_, new_folder_);
 
-       return imap_cmd_ok(sock, NULL);
+       return imap_cmd_ok(session, NULL);
 }
 
-static gint imap_cmd_delete(SockInfo *sock, const gchar *folder)
+static gint imap_cmd_delete(IMAPSession *session, const gchar *folder)
 {
        gchar *folder_;
 
        QUOTE_IF_REQUIRED(folder_, folder);
-       imap_cmd_gen_send(sock, "DELETE %s", folder_);
+       imap_gen_send(session, "DELETE %s", folder_);
 
-       return imap_cmd_ok(sock, NULL);
+       return imap_cmd_ok(session, NULL);
 }
 
-static gint imap_cmd_search(SockInfo *sock, const gchar *criteria, GSList **list)
+static gint imap_cmd_search(IMAPSession *session, const gchar *criteria, GSList **list)
 {
        gint ok;
        gchar *uidlist;
@@ -2429,9 +2677,9 @@ static gint imap_cmd_search(SockInfo *sock, const gchar *criteria, GSList **list
        *list = NULL;
        
        argbuf = g_ptr_array_new();
-       imap_cmd_gen_send(sock, "UID SEARCH %s", criteria);
+       imap_gen_send(session, "UID SEARCH %s", criteria);
 
-       ok = imap_cmd_ok(sock, argbuf);
+       ok = imap_cmd_ok(session, argbuf);
        if (ok != IMAP_SUCCESS) {
                ptr_array_free_strings(argbuf);
                g_ptr_array_free(argbuf, TRUE);
@@ -2456,53 +2704,54 @@ static gint imap_cmd_search(SockInfo *sock, const gchar *criteria, GSList **list
        return IMAP_SUCCESS;
 }
 
-static gint imap_cmd_fetch(SockInfo *sock, guint32 uid, const gchar *filename)
+static gint imap_cmd_fetch(IMAPSession *session, guint32 uid, const gchar *filename)
 {
        gint ok;
-       gchar *buf;
+       gchar *buf = NULL;
        gchar *cur_pos;
        gchar size_str[32];
        glong size_num;
 
        g_return_val_if_fail(filename != NULL, IMAP_ERROR);
 
-       imap_cmd_gen_send(sock, "UID FETCH %d BODY.PEEK[]", uid);
+       imap_gen_send(session, "UID FETCH %d BODY.PEEK[]", uid);
 
-       while ((ok = imap_cmd_gen_recv(sock, &buf))
-              == IMAP_SUCCESS) {
+       while ((ok = imap_gen_recv(session, &buf)) == IMAP_SUCCESS) {
                if (buf[0] != '*' || buf[1] != ' ') {
                        g_free(buf);
                        return IMAP_ERROR;
                }
-               if (strstr(buf, "FETCH") != NULL)
-                       break;
+               if (strstr(buf, "FETCH") != NULL) break;
+               g_free(buf);
        }
-       if (ok != IMAP_SUCCESS)
+       if (ok != IMAP_SUCCESS) {
+               g_free(buf);
                return ok;
+       }
 
-       cur_pos = strchr(buf, '{');
-       if (cur_pos == NULL) {
-               g_free(buf);
-               return IMAP_ERROR;
+#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));
-       if (cur_pos == NULL) {
-               g_free(buf);
-               return IMAP_ERROR;
-       }
+       RETURN_ERROR_IF_FAIL(cur_pos != NULL);
        size_num = atol(size_str);
+       RETURN_ERROR_IF_FAIL(size_num > 0);
 
-       if (*cur_pos != '\0') {
-               g_free(buf);
-               return IMAP_ERROR;
-       }
+       RETURN_ERROR_IF_FAIL(*cur_pos == '\0');
 
-       if (recv_bytes_write_to_file(sock, size_num, filename) != 0) {
-               g_free(buf);
+#undef RETURN_ERROR_IF_FAIL
+
+       g_free(buf);
+
+       if (recv_bytes_write_to_file(SESSION(session)->sock, size_num, filename) != 0)
                return IMAP_ERROR;
-       }
 
-       if (imap_cmd_gen_recv(sock, &buf) != IMAP_SUCCESS) {
+       if (imap_gen_recv(session, &buf) != IMAP_SUCCESS) {
                g_free(buf);
                return IMAP_ERROR;
        }
@@ -2511,20 +2760,22 @@ static gint imap_cmd_fetch(SockInfo *sock, guint32 uid, const gchar *filename)
                g_free(buf);
                return IMAP_ERROR;
        }
-
        g_free(buf);
-       ok = imap_cmd_ok(sock, NULL);
+
+       ok = imap_cmd_ok(session, NULL);
 
        return ok;
 }
 
 static gint imap_cmd_append(IMAPSession *session, const gchar *destfolder,
-                           const gchar *file, gint32 *new_uid)
+                           const gchar *file, IMAPFlags flags, gint32 *new_uid)
 {
        gint ok;
        gint size, newuid;
        gchar *destfolder_;
-       gchar buf[BUFFSIZE], *imapbuf;
+       gchar *flag_str;
+       gchar *ret = NULL;
+       gchar buf[BUFFSIZE];
        FILE *fp;
        GPtrArray *reply;
        gchar *okmsginfo;
@@ -2537,16 +2788,19 @@ static gint imap_cmd_append(IMAPSession *session, const gchar *destfolder,
                return -1;
        }
        QUOTE_IF_REQUIRED(destfolder_, destfolder);
-       imap_cmd_gen_send(SESSION(session)->sock, "APPEND %s (\\Seen) {%d}", destfolder_, size);
+       flag_str = imap_get_flag_str(flags);
+       imap_gen_send(session, "APPEND %s (%s) {%d}", 
+                     destfolder_, flag_str, size);
+       g_free(flag_str);
 
-       ok = imap_cmd_gen_recv(SESSION(session)->sock, &imapbuf);
-       if (ok != IMAP_SUCCESS || imapbuf[0] != '+' || imapbuf[1] != ' ') {
+       ok = imap_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(imapbuf);
+               g_free(ret);
                fclose(fp);
                return IMAP_ERROR;
        }
-       g_free(imapbuf);
+       g_free(ret);
 
        log_print("IMAP4> %s\n", _("(sending file...)"));
 
@@ -2571,7 +2825,7 @@ static gint imap_cmd_append(IMAPSession *session, const gchar *destfolder,
        reply = g_ptr_array_new();
 
        *new_uid = 0;
-       ok = imap_cmd_ok(SESSION(session)->sock, reply);
+       ok = imap_cmd_ok(session, reply);
        if (ok != IMAP_SUCCESS)
                log_warning(_("can't append message to %s\n"), destfolder_);
        else if (
@@ -2587,42 +2841,43 @@ static gint imap_cmd_append(IMAPSession *session, const gchar *destfolder,
        return ok;
 }
 
-
-static gint imap_cmd_copy(IMAPSession * session,
-                         gint32 msgnum,
-                         const gchar * destfolder, gint32 * new_uid)
+static gint imap_cmd_copy(IMAPSession *session, const gchar *seq_set,
+                         const gchar *destfolder, GRelation *uid_mapping)
 {
        gint ok;
-       gint32 olduid, newuid;
-       gchar *okmsginfo;
        gchar *destfolder_;
        GPtrArray *reply;
-
-       g_return_val_if_fail(destfolder != NULL, IMAP_ERROR);
+       
        g_return_val_if_fail(session != NULL, IMAP_ERROR);
-       g_return_val_if_fail(new_uid != NULL, IMAP_ERROR);
+       g_return_val_if_fail(seq_set != NULL, IMAP_ERROR);
+       g_return_val_if_fail(destfolder != NULL, IMAP_ERROR);
 
        QUOTE_IF_REQUIRED(destfolder_, destfolder);
-       imap_cmd_gen_send(SESSION(session)->sock, "UID COPY %d %s", msgnum, destfolder_);
+       imap_gen_send(session, "UID COPY %s %s", seq_set, destfolder_);
 
        reply = g_ptr_array_new();
 
-       *new_uid = 0;
-       ok = imap_cmd_ok(SESSION(session)->sock, reply);
+       ok = imap_cmd_ok(session, reply);
        if (ok != IMAP_SUCCESS)
-               log_warning(_("can't copy %d to %s\n"), msgnum, destfolder_);
+               log_warning(_("can't copy %s to %s\n"), seq_set, destfolder_);
+/*
+       TODO: UIDPLUS
+       
+       - split IMAPSets into uids
+       - g_relation_insert(uid_mapping, olduid, newuid);
+
        else if (imap_has_capability(session, "UIDPLUS") && reply->len > 0)
                if ((okmsginfo = g_ptr_array_index(reply, reply->len - 1)) != NULL &&
                    sscanf(okmsginfo, "%*u OK [COPYUID %*u %u %u]", &olduid, &newuid) == 2 &&
                    olduid == msgnum)
                        *new_uid = newuid;
-
+*/
        ptr_array_free_strings(reply);
        g_ptr_array_free(reply, TRUE);
        return ok;
 }
 
-gint imap_cmd_envelope(SockInfo *sock, IMAPSet set)
+gint imap_cmd_envelope(IMAPSession *session, IMAPSet set)
 {
        static GString *header_fields = NULL;
 
@@ -2651,37 +2906,36 @@ gint imap_cmd_envelope(SockInfo *sock, IMAPSet set)
                                        namelen, elem->name);
                }
        }
-       
-       imap_cmd_gen_send
-               (sock, "UID FETCH %s (UID FLAGS RFC822.SIZE BODY.PEEK[HEADER.FIELDS (%s)])",
+
+       imap_gen_send
+               (session, "UID FETCH %s (UID FLAGS RFC822.SIZE BODY.PEEK[HEADER.FIELDS (%s)])",
                 set, header_fields->str);
 
        return IMAP_SUCCESS;
 }
 
-static gint imap_cmd_store(SockInfo *sock, IMAPSet set,
+static gint imap_cmd_store(IMAPSession *session, IMAPSet seq_set,
                           gchar *sub_cmd)
 {
        gint ok;
 
-       imap_cmd_gen_send(sock, "UID STORE %s %s",
-                         set, sub_cmd);
+       imap_gen_send(session, "UID STORE %s %s", seq_set, sub_cmd);
 
-       if ((ok = imap_cmd_ok(sock, NULL)) != IMAP_SUCCESS) {
+       if ((ok = imap_cmd_ok(session, NULL)) != IMAP_SUCCESS) {
                log_warning(_("error while imap command: STORE %s %s\n"),
-                           set, sub_cmd);
+                           seq_set, sub_cmd);
                return ok;
        }
 
        return IMAP_SUCCESS;
 }
 
-static gint imap_cmd_expunge(SockInfo *sock)
+static gint imap_cmd_expunge(IMAPSession *session)
 {
        gint ok;
 
-       imap_cmd_gen_send(sock, "EXPUNGE");
-       if ((ok = imap_cmd_ok(sock, NULL)) != IMAP_SUCCESS) {
+       imap_gen_send(session, "EXPUNGE");
+       if ((ok = imap_cmd_ok(session, NULL)) != IMAP_SUCCESS) {
                log_warning(_("error while imap command: EXPUNGE\n"));
                return ok;
        }
@@ -2689,70 +2943,98 @@ static gint imap_cmd_expunge(SockInfo *sock)
        return IMAP_SUCCESS;
 }
 
-static gint imap_cmd_ok(SockInfo *sock, GPtrArray *argbuf)
+static gint imap_cmd_close(IMAPSession *session)
 {
        gint ok;
+
+       imap_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 = IMAP_SUCCESS;
        gchar *buf;
        gint cmd_num;
-       gchar cmd_status[IMAPBUFSIZE];
+       gchar *data;
 
-       while ((ok = imap_cmd_gen_recv(sock, &buf))
+       while ((ok = imap_gen_recv(session, &buf))
               == IMAP_SUCCESS) {
+               // make sure data is long enough for any substring of buf
+               data = alloca(strlen(buf) + 1);
+
+               // untagged line read
                if (buf[0] == '*' && buf[1] == ' ') {
+                       gint num;
                        if (argbuf)
                                g_ptr_array_add(argbuf, g_strdup(buf + 2));
-                       continue;
-               }
 
-               if (sscanf(buf, "%d %s", &cmd_num, cmd_status) < 2)
-                       return IMAP_ERROR;
-               else if (cmd_num == imap_cmd_count &&
-                        !strcmp(cmd_status, "OK")) {
+                       if (sscanf(buf + 2, "%d %s", &num, data) >= 2) {
+                               if (!strcmp(data, "EXISTS")) {
+                                       session->exists = num;
+                                       session->folder_content_changed = TRUE;
+                               }
+
+                               if(!strcmp(data, "EXPUNGE")) {
+                                       session->exists--;
+                                       session->folder_content_changed = TRUE;
+                               }
+                       }
+               // tagged line with correct tag and OK response found
+               } else if ((sscanf(buf, "%d %s", &cmd_num, data) >= 2) &&
+                          (cmd_num == session->cmd_count) &&
+                          !strcmp(data, "OK")) {
                        if (argbuf)
                                g_ptr_array_add(argbuf, g_strdup(buf));
-                       g_free(buf);
-                       return IMAP_SUCCESS;
+                       break;
+               // everything else
                } else {
-                       g_free(buf);
-                       return IMAP_ERROR;
+                       ok = IMAP_ERROR;
+                       break;
                }
+               g_free(buf);
        }
        g_free(buf);
 
        return ok;
 }
 
-static void imap_cmd_gen_send(SockInfo *sock, const gchar *format, ...)
+static void imap_gen_send(IMAPSession *session, const gchar *format, ...)
 {
-       gchar buf[IMAPBUFSIZE];
-       gchar tmp[IMAPBUFSIZE];
+       gchar *buf;
+       gchar *tmp;
        gchar *p;
        va_list args;
 
        va_start(args, format);
-       g_vsnprintf(tmp, sizeof(tmp), format, args);
+       tmp = g_strdup_vprintf(format, args);
        va_end(args);
 
-       imap_cmd_count++;
+       session->cmd_count++;
 
-       g_snprintf(buf, sizeof(buf), "%d %s\r\n", imap_cmd_count, tmp);
+       buf = g_strdup_printf("%d %s\r\n", session->cmd_count, tmp);
        if (!strncasecmp(tmp, "LOGIN ", 6) && (p = strchr(tmp + 6, ' '))) {
                *p = '\0';
-               log_print("IMAP4> %d %s ********\n", imap_cmd_count, tmp);
+               log_print("IMAP4> %d %s ********\n", session->cmd_count, tmp);
        } else
-               log_print("IMAP4> %d %s\n", imap_cmd_count, tmp);
+               log_print("IMAP4> %d %s\n", session->cmd_count, tmp);
 
-       sock_write_all(sock, buf, strlen(buf));
+       sock_write_all(SESSION(session)->sock, buf, strlen(buf));
+       g_free(tmp);
+       g_free(buf);
 }
 
-static gint imap_cmd_gen_recv(SockInfo *sock, gchar **buf)
+static gint imap_gen_recv(IMAPSession *session, gchar **ret)
 {
-       if ((*buf = sock_getline(sock)) == NULL)
+       if ((*ret = sock_getline(SESSION(session)->sock)) == NULL)
                return IMAP_SOCKET;
 
-       strretchomp(*buf);
+       strretchomp(*ret);
 
-       log_print("IMAP4< %s\n", *buf);
+       log_print("IMAP4< %s\n", *ret);
 
        return IMAP_SUCCESS;
 }
@@ -2852,7 +3134,22 @@ static void imap_path_separator_subst(gchar *str, gchar separator)
 static gchar *imap_modified_utf7_to_locale(const gchar *mutf7_str)
 {
 #if !HAVE_ICONV
-       return g_strdup(mutf7_str);
+       const gchar *from_p;
+       gchar *to, *to_p;
+
+       to = g_malloc(strlen(mutf7_str) + 1);
+       to_p = to;
+
+       for (from_p = mutf7_str; *from_p != '\0'; from_p++) {
+               if (*from_p == '&' && *(from_p + 1) == '-') {
+                       *to_p++ = '&';
+                       from_p++;
+               } else
+                       *to_p++ = *from_p;
+       }
+       *to_p = '\0';
+
+       return to;
 #else
        static iconv_t cd = (iconv_t)-1;
        static gboolean iconv_ok = TRUE;
@@ -2926,7 +3223,22 @@ static gchar *imap_modified_utf7_to_locale(const gchar *mutf7_str)
 static gchar *imap_locale_to_modified_utf7(const gchar *from)
 {
 #if !HAVE_ICONV
-       return g_strdup(from);
+       const gchar *from_p;
+       gchar *to, *to_p;
+
+       to = g_malloc(strlen(from) * 2 + 1);
+       to_p = to;
+
+       for (from_p = from; *from_p != '\0'; from_p++) {
+               if (*from_p == '&') {
+                       *to_p++ = '&';
+                       *to_p++ = '-';
+               } else
+                       *to_p++ = *from_p;
+       }
+       *to_p = '\0';
+
+       return to;
 #else
        static iconv_t cd = (iconv_t)-1;
        static gboolean iconv_ok = TRUE;
@@ -2957,22 +3269,37 @@ static gchar *imap_locale_to_modified_utf7(const gchar *from)
 #define IS_PRINT(ch) (isprint(ch) && isascii(ch))
 
        while (from_len > 0) {
-               if (IS_PRINT(*from_tmp)) {
+               if (*from_tmp == '+') {
+                       *norm_utf7_p++ = '+';
+                       *norm_utf7_p++ = '-';
+                       norm_utf7_len -= 2;
+                       from_tmp++;
+                       from_len--;
+               } else if (IS_PRINT(*from_tmp)) {
                        /* printable ascii char */
                        *norm_utf7_p = *from_tmp;
                        norm_utf7_p++;
+                       norm_utf7_len--;
                        from_tmp++;
                        from_len--;
                } else {
-                       size_t mblen;
+                       size_t mb_len = 0, conv_len = 0;
 
                        /* unprintable char: convert to UTF-7 */
-                       for (mblen = 0;
-                            !IS_PRINT(from_tmp[mblen]) && mblen < from_len;
-                            mblen++)
-                               ;
-                       from_len -= mblen;
-                       if (iconv(cd, (ICONV_CONST gchar **)&from_tmp, &mblen,
+                       p = from_tmp;
+                       while (!IS_PRINT(*p) && conv_len < from_len) {
+                               mb_len = mblen(p, MB_LEN_MAX);
+                               if (mb_len <= 0) {
+                                       g_warning("wrong multibyte sequence\n");
+                                       return g_strdup(from);
+                               }
+                               conv_len += mb_len;
+                               p += mb_len;
+                       }
+
+                       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",
                                          conv_get_current_charset_str());
@@ -2991,17 +3318,23 @@ static gchar *imap_locale_to_modified_utf7(const gchar *from)
        for (p = norm_utf7; p < norm_utf7_p; p++) {
                /* replace: '&' -> "&-",
                            '+' -> '&',
-                           escaped '/' -> ',' */
+                           "+-" -> '+',
+                           BASE64 '/' -> ',' */
                if (!in_escape && *p == '&') {
                        g_string_append(to_str, "&-");
                } else if (!in_escape && *p == '+') {
-                       g_string_append_c(to_str, '&');
-                       in_escape = TRUE;
+                       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 == '-') {
-                       in_escape = FALSE;
                        g_string_append_c(to_str, '-');
+                       in_escape = FALSE;
                } else {
                        g_string_append_c(to_str, *p);
                }
@@ -3019,6 +3352,84 @@ static gchar *imap_locale_to_modified_utf7(const gchar *from)
 #endif /* !HAVE_ICONV */
 }
 
+static GSList *imap_get_seq_set_from_numlist(MsgNumberList *numlist)
+{
+       GString *str;
+       GSList *sorted_list, *cur;
+       guint first, last, next;
+       gchar *ret_str;
+       GSList *ret_list = NULL;
+
+       if (numlist == NULL)
+               return NULL;
+
+       str = g_string_sized_new(256);
+
+       sorted_list = g_slist_copy(numlist);
+       sorted_list = g_slist_sort(sorted_list, g_int_compare);
+
+       first = GPOINTER_TO_INT(sorted_list->data);
+
+       for (cur = sorted_list; cur != NULL; cur = g_slist_next(cur)) {
+               last = GPOINTER_TO_INT(cur->data);
+               if (cur->next)
+                       next = GPOINTER_TO_INT(cur->next->data);
+               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 GSList *imap_get_seq_set_from_msglist(MsgInfoList *msglist)
+{
+       MsgNumberList *numlist = NULL;
+       MsgInfoList *cur;
+       GSList *seq_list;
+
+       for (cur = msglist; cur != NULL; cur = g_slist_next(cur)) {
+               MsgInfo *msginfo = (MsgInfo *) cur->data;
+
+               numlist = g_slist_append(numlist, GINT_TO_POINTER(msginfo->msgnum));
+       }
+       seq_list = imap_get_seq_set_from_numlist(numlist);
+       g_slist_free(numlist);
+
+       return seq_list;
+}
+
+static void imap_seq_set_free(GSList *seq_list)
+{
+       slist_free_strings(seq_list);
+       g_slist_free(seq_list);
+}
+
+
 static gboolean imap_rename_folder_func(GNode *node, gpointer data)
 {
        FolderItem *item = node->data;
@@ -3064,7 +3475,7 @@ static gint get_list_of_uids(Folder *folder, IMAPFolderItem *item, GSList **msgn
                return -1;
 
        cmd_buf = g_strdup_printf("UID %d:*", item->lastuid + 1);
-       ok = imap_cmd_search(SESSION(session)->sock, cmd_buf, &uidlist);
+       ok = imap_cmd_search(session, cmd_buf, &uidlist);
        g_free(cmd_buf);
 
        if (ok == IMAP_SOCKET) {
@@ -3080,9 +3491,9 @@ static gint get_list_of_uids(Folder *folder, IMAPFolderItem *item, GSList **msgn
                argbuf = g_ptr_array_new();
 
                cmd_buf = g_strdup_printf("UID FETCH %d:* (UID)", item->lastuid + 1);
-               imap_cmd_gen_send(SESSION(session)->sock, cmd_buf);
+               imap_gen_send(session, cmd_buf);
                g_free(cmd_buf);
-               ok = imap_cmd_ok(SESSION(session)->sock, argbuf);
+               ok = imap_cmd_ok(session, argbuf);
                if (ok != IMAP_SUCCESS) {
                        ptr_array_free_strings(argbuf);
                        g_ptr_array_free(argbuf, TRUE);
@@ -3130,6 +3541,7 @@ gint imap_get_num_list(Folder *folder, FolderItem *_item, GSList **msgnum_list)
        gint ok, nummsgs = 0, exists, recent, unseen, uid_val, uid_next;
        GSList *uidlist;
        gchar *dir;
+       gboolean selected_folder;
 
        g_return_val_if_fail(folder != NULL, -1);
        g_return_val_if_fail(item != NULL, -1);
@@ -3140,16 +3552,26 @@ gint imap_get_num_list(Folder *folder, FolderItem *_item, GSList **msgnum_list)
        session = imap_session_get(folder);
        g_return_val_if_fail(session != NULL, -1);
 
-       ok = imap_status(session, IMAP_FOLDER(folder), item->item.path,
-                        &exists, &recent, &uid_next, &uid_val, &unseen);
-       if (ok != IMAP_SUCCESS)
-               return -1;
+       selected_folder = (session->mbox != NULL) &&
+                         (!strcmp(session->mbox, item->item.path));
+       if (selected_folder) {
+               ok = imap_cmd_noop(session);
+               if (ok != IMAP_SUCCESS)
+                       return -1;
+               exists = session->exists;
+       } else {
+               ok = imap_status(session, IMAP_FOLDER(folder), item->item.path,
+                                &exists, &recent, &uid_next, &uid_val, &unseen);
+               if (ok != IMAP_SUCCESS)
+                       return -1;
+       }
 
        /* If old uid_next matches new uid_next we can be sure no message
           was added to the folder */
-       if (uid_next == item->uid_next) {
+       if (( selected_folder && !session->folder_content_changed) ||
+           (!selected_folder && uid_next == item->uid_next)) {
                nummsgs = g_slist_length(item->uid_list);
-               
+
                /* If number of messages is still the same we
                    know our caches message numbers are still valid,
                    otherwise if the number of messages has decrease
@@ -3165,7 +3587,8 @@ gint imap_get_num_list(Folder *folder, FolderItem *_item, GSList **msgnum_list)
                        item->uid_list = NULL;
                }
        }
-       item->uid_next = uid_next;
+       if (!selected_folder)
+               item->uid_next = uid_next;
 
        if (exists == 0) {
                *msgnum_list = NULL;
@@ -3331,7 +3754,7 @@ gboolean imap_check_msgnum_validity(Folder *folder, FolderItem *_item)
        if(item->item.mtime == uid_validity)
                return TRUE;
 
-       debug_print("Freeing imap uid cache");
+       debug_print("Freeing imap uid cache\n");
        item->lastuid = 0;
        g_slist_free(item->uid_list);
        item->uid_list = NULL;