path: root/camel/providers/local/camel-maildir-summary.c

/*
 *  Copyright (C) 2000 Ximian Inc.
 *
 *  Authors: Not Zed <notzed@lostzed.mmc.com.au>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * 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 <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/uio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>

#include <sys/types.h>
#include <dirent.h>

#include <ctype.h>

#include "camel-maildir-summary.h"
#include <camel/camel-mime-message.h>
#include <camel/camel-operation.h>

#include "camel-private.h"
#include "e-util/e-memory.h"

#define d(x) /*(printf("%s(%d): ", __FILE__, __LINE__),(x))*/

#define CAMEL_MAILDIR_SUMMARY_VERSION (0x2000)

static CamelMessageInfo *message_info_load(CamelFolderSummary *s, FILE *in);
static CamelMessageInfo *message_info_new(CamelFolderSummary *, struct _header_raw *);
static void message_info_free(CamelFolderSummary *, CamelMessageInfo *mi);

static int maildir_summary_load(CamelLocalSummary *cls, int forceindex, CamelException *ex);
static int maildir_summary_check(CamelLocalSummary *cls, CamelFolderChangeInfo *changeinfo, CamelException *ex);
static int maildir_summary_sync(CamelLocalSummary *cls, gboolean expunge, CamelFolderChangeInfo *changeinfo, CamelException *ex);
static CamelMessageInfo *maildir_summary_add(CamelLocalSummary *cls, CamelMimeMessage *msg, const CamelMessageInfo *info, CamelFolderChangeInfo *, CamelException *ex);

static char *maildir_summary_next_uid_string(CamelFolderSummary *s);
static int maildir_summary_decode_x_evolution(CamelLocalSummary *cls, const char *xev, CamelMessageInfo *mi);
static char *maildir_summary_encode_x_evolution(CamelLocalSummary *cls, const CamelMessageInfo *mi);

static void camel_maildir_summary_class_init    (CamelMaildirSummaryClass *class);
static void camel_maildir_summary_init  (CamelMaildirSummary *gspaper);
static void camel_maildir_summary_finalise  (CamelObject *obj);

#define _PRIVATE(x) (((CamelMaildirSummary *)(x))->priv)

struct _CamelMaildirSummaryPrivate {
    char *current_file;
    char *hostname;

    GHashTable *load_map;
};

static CamelLocalSummaryClass *parent_class;

CamelType
camel_maildir_summary_get_type (void)
{
    static CamelType type = CAMEL_INVALID_TYPE;
    
    if (type == CAMEL_INVALID_TYPE) {
        type = camel_type_register(camel_local_summary_get_type (), "CamelMaildirSummary",
                       sizeof(CamelMaildirSummary),
                       sizeof(CamelMaildirSummaryClass),
                       (CamelObjectClassInitFunc)camel_maildir_summary_class_init,
                       NULL,
                       (CamelObjectInitFunc)camel_maildir_summary_init,
                       (CamelObjectFinalizeFunc)camel_maildir_summary_finalise);
    }
    
    return type;
}

static void
camel_maildir_summary_class_init (CamelMaildirSummaryClass *class)
{
    CamelFolderSummaryClass *sklass = (CamelFolderSummaryClass *) class;
    CamelLocalSummaryClass *lklass = (CamelLocalSummaryClass *)class;

    parent_class = (CamelLocalSummaryClass *)camel_type_get_global_classfuncs(camel_local_summary_get_type ());

    /* override methods */
    sklass->message_info_load = message_info_load;
    sklass->message_info_new = message_info_new;
    sklass->message_info_free = message_info_free;
    sklass->next_uid_string = maildir_summary_next_uid_string;

    lklass->load = maildir_summary_load;
    lklass->check = maildir_summary_check;
    lklass->sync = maildir_summary_sync;
    lklass->add = maildir_summary_add;
    lklass->encode_x_evolution = maildir_summary_encode_x_evolution;
    lklass->decode_x_evolution = maildir_summary_decode_x_evolution;
}

static void
camel_maildir_summary_init (CamelMaildirSummary *o)
{
    struct _CamelFolderSummary *s = (CamelFolderSummary *) o;
    char hostname[256];

    o->priv = g_malloc0(sizeof(*o->priv));
    /* set unique file version */
    s->version += CAMEL_MAILDIR_SUMMARY_VERSION;

    s->message_info_size = sizeof(CamelMaildirMessageInfo);
    s->content_info_size = sizeof(CamelMaildirMessageContentInfo);

#if defined (DOEPOOLV) || defined (DOESTRV)
    s->message_info_strings = CAMEL_MAILDIR_INFO_LAST;
#endif

    if (gethostname(hostname, 256) == 0) {
        o->priv->hostname = g_strdup(hostname);
    } else {
        o->priv->hostname = g_strdup("localhost");
    }
}

static void
camel_maildir_summary_finalise(CamelObject *obj)
{
    CamelMaildirSummary *o = (CamelMaildirSummary *)obj;

    g_free(o->priv->hostname);
    g_free(o->priv);
}

/**
 * camel_maildir_summary_new:
 *
 * Create a new CamelMaildirSummary object.
 * 
 * Return value: A new #CamelMaildirSummary object.
 **/
CamelMaildirSummary *camel_maildir_summary_new  (const char *filename, const char *maildirdir, CamelIndex *index)
{
    CamelMaildirSummary *o = (CamelMaildirSummary *)camel_object_new(camel_maildir_summary_get_type ());

    camel_local_summary_construct((CamelLocalSummary *)o, filename, maildirdir, index);
    return o;
}

/* the 'standard' maildir flags.  should be defined in sorted order. */
static struct {
    char flag;
    guint32 flagbit;
} flagbits[] = {
    { 'F', CAMEL_MESSAGE_FLAGGED },
    { 'R', CAMEL_MESSAGE_ANSWERED },
    { 'S', CAMEL_MESSAGE_SEEN },
    { 'T', CAMEL_MESSAGE_DELETED },
};

/* convert the uid + flags into a unique:info maildir format */
char *camel_maildir_summary_info_to_name(const CamelMessageInfo *info)
{
    char *p, *buf;
    int i;
    const char *uid;

    uid = camel_message_info_uid(info);
    buf = alloca(strlen(uid) + strlen(":2,") +  (sizeof(flagbits)/sizeof(flagbits[0])) + 1);
    p = buf + sprintf(buf, "%s:2,", uid);
    for (i=0;i<sizeof(flagbits)/sizeof(flagbits[0]);i++) {
        if (info->flags & flagbits[i].flagbit)
            *p++ = flagbits[i].flag;
    }
    *p = 0;

    return g_strdup(buf);
}

/* returns 0 if the info matches (or there was none), otherwise we changed it */
int camel_maildir_summary_name_to_info(CamelMessageInfo *info, const char *name)
{
    char *p, c;
    guint32 set = 0;    /* what we set */
    /*guint32 all = 0;*/    /* all flags */
    int i;

    p = strstr(name, ":2,");
    if (p) {
        p+=3;
        while ((c = *p++)) {
            /* we could assume that the flags are in order, but its just as easy not to require */
            for (i=0;i<sizeof(flagbits)/sizeof(flagbits[0]);i++) {
                if (flagbits[i].flag == c && (info->flags & flagbits[i].flagbit) == 0) {
                    set |= flagbits[i].flagbit;
                }
                /*all |= flagbits[i].flagbit;*/
            }
        }

        /* changed? */
        /*if ((info->flags & all) != set) {*/
        if ((info->flags & set) != set) {
            /* ok, they did change, only add the new flags ('merge flags'?) */
            /*info->flags &= all;  if we wanted to set only the new flags, which we probably dont */
            info->flags |= set;
            return 1;
        }
    }

    return 0;
}

/* for maildir, x-evolution isn't used, so dont try and get anything out of it */
static int maildir_summary_decode_x_evolution(CamelLocalSummary *cls, const char *xev, CamelMessageInfo *mi)
{
    return -1;
}

static char *maildir_summary_encode_x_evolution(CamelLocalSummary *cls, const CamelMessageInfo *mi)
{
    return NULL;
}

/* FIXME:
   both 'new' and 'add' will try and set the filename, this is not ideal ...
*/
static CamelMessageInfo *maildir_summary_add(CamelLocalSummary *cls, CamelMimeMessage *msg, const CamelMessageInfo *info, CamelFolderChangeInfo *changes, CamelException *ex)
{
    CamelMessageInfo *mi;

    mi = ((CamelLocalSummaryClass *) parent_class)->add(cls, msg, info, changes, ex);
    if (mi) {
        if (info) {
            camel_maildir_info_set_filename(mi, camel_maildir_summary_info_to_name(mi));
            d(printf("Setting filename to %s\n", camel_maildir_info_filename(mi)));
        }
    }

    return mi;
}

static CamelMessageInfo *message_info_new(CamelFolderSummary * s, struct _header_raw *h)
{
    CamelMessageInfo *mi;
    CamelMaildirSummary *mds = (CamelMaildirSummary *)s;
    CamelMaildirMessageInfo *mdi;
    const char *uid;

    mi = ((CamelFolderSummaryClass *) parent_class)->message_info_new(s, h);
    /* assign the uid and new filename */
    if (mi) {
        mdi = (CamelMaildirMessageInfo *)mi;

        uid = camel_message_info_uid(mi);
        if (uid==NULL || uid[0] == 0)
            camel_message_info_set_uid(mi, camel_folder_summary_next_uid_string(s));

        /* with maildir we know the real received date, from the filename */
        mi->date_received = strtoul(camel_message_info_uid(mi), NULL, 10);

        if (mds->priv->current_file) {
#if 0
            char *p1, *p2, *p3;
            unsigned long uid;
#endif
            /* if setting from a file, grab the flags from it */
            camel_maildir_info_set_filename(mi, g_strdup(mds->priv->current_file));
            camel_maildir_summary_name_to_info(mi, mds->priv->current_file);

#if 0
            /* Actually, I dont think all this effort is worth it at all ... */

            /* also, see if we can extract the next-id from tne name, and safe-if-fy ourselves against collisions */
            /* we check for something.something_number.something */
            p1 = strchr(mdi->filename, '.');
            if (p1) {
                p2 = strchr(p1+1, '.');
                p3 = strchr(p1+1, '_');
                if (p2 && p3 && p3<p2) {
                    uid = strtoul(p3+1, &p1, 10);
                    if (p1 == p2 && uid>0)
                        camel_folder_summary_set_uid(s, uid);
                }
            }
#endif
        } else {
            /* if creating a file, set its name from the flags we have */
            camel_maildir_info_set_filename(mdi, camel_maildir_summary_info_to_name(mi));
            d(printf("Setting filename to %s\n", camel_maildir_info_filename(mi)));
        }
    }

    return mi;
}


static void message_info_free(CamelFolderSummary *s, CamelMessageInfo *mi)
{
#if !defined (DOEPOOLV) && !defined (DOESTRV)
    CamelMaildirMessageInfo *mdi = (CamelMaildirMessageInfo *)mi;

    g_free(mdi->filename);
#endif
    ((CamelFolderSummaryClass *) parent_class)->message_info_free(s, mi);
}


static char *maildir_summary_next_uid_string(CamelFolderSummary *s)
{
    CamelMaildirSummary *mds = (CamelMaildirSummary *)s;

    d(printf("next uid string called?\n"));

    /* if we have a current file, then use that to get the uid */
    if (mds->priv->current_file) {
        char *cln;

        cln = strchr(mds->priv->current_file, ':');
        if (cln)
            return g_strndup(mds->priv->current_file, cln-mds->priv->current_file);
        else
            return g_strdup(mds->priv->current_file);
    } else {
        /* the first would probably work, but just to be safe, check for collisions */
#if 0
        return g_strdup_printf("%ld.%d_%u.%s", time(0), getpid(), camel_folder_summary_next_uid(s), mds->priv->hostname);
#else
        CamelLocalSummary *cls = (CamelLocalSummary *)s;
        char *name = NULL, *uid = NULL;
        struct stat st;
        int retry = 0;
        guint32 nextuid = camel_folder_summary_next_uid(s);

        /* we use time.pid_count.hostname */
        do {
            if (retry > 0) {
                g_free(name);
                g_free(uid);
                sleep(2);
            }
            uid = g_strdup_printf("%ld.%d_%u.%s", time(0), getpid(), nextuid, mds->priv->hostname);
            name = g_strdup_printf("%s/tmp/%s", cls->folder_path, uid);
            retry++;
        } while (stat(name, &st) == 0 && retry<3);

        /* I dont know what we're supposed to do if it fails to find a unique name?? */

        g_free(name);
        return uid;
#endif
    }
}

static CamelMessageInfo *
message_info_load(CamelFolderSummary *s, FILE *in)
{
    CamelMessageInfo *mi;
    CamelMaildirSummary *mds = (CamelMaildirSummary *)s;

    mi = ((CamelFolderSummaryClass *) parent_class)->message_info_load(s, in);
    if (mi) {
        char *name;

        if (mds->priv->load_map
            && (name = g_hash_table_lookup(mds->priv->load_map, camel_message_info_uid(mi)))) {
            d(printf("Setting filename of %s to %s\n", camel_message_info_uid(mi), name));
            camel_maildir_info_set_filename(mi, g_strdup(name));
            camel_maildir_summary_name_to_info(mi, name);
        }
    }

    return mi;
}

static int maildir_summary_load(CamelLocalSummary *cls, int forceindex, CamelException *ex)
{
    char *cur;
    DIR *dir;
    struct dirent *d;
    CamelMaildirSummary *mds = (CamelMaildirSummary *)cls;
    char *uid;
    EMemPool *pool;
    int ret;

    cur = g_strdup_printf("%s/cur", cls->folder_path);

    d(printf("pre-loading uid <> filename map\n"));

    dir = opendir(cur);
    if (dir == NULL) {
        camel_exception_setv(ex, 1, _("Cannot open maildir directory path: %s: %s"), cls->folder_path, strerror(errno));
        g_free(cur);
        return -1;
    }

    mds->priv->load_map = g_hash_table_new(g_str_hash, g_str_equal);
    pool = e_mempool_new(1024, 512, E_MEMPOOL_ALIGN_BYTE);

    while ( (d = readdir(dir)) ) {
        if (d->d_name[0] == '.')
            continue;
        
        /* map the filename -> uid */
        uid = strchr(d->d_name, ':');
        if (uid) {
            int len = uid-d->d_name;
            uid = e_mempool_alloc(pool, len+1);
            memcpy(uid, d->d_name, len);
            uid[len] = 0;
            g_hash_table_insert(mds->priv->load_map, uid, e_mempool_strdup(pool, d->d_name));
        } else {
            uid = e_mempool_strdup(pool, d->d_name);
            g_hash_table_insert(mds->priv->load_map, uid, uid);
        }
    }
    closedir(dir);
    g_free(cur);

    ret = ((CamelLocalSummaryClass *) parent_class)->load(cls, forceindex, ex);

    g_hash_table_destroy(mds->priv->load_map);
    mds->priv->load_map = NULL;
    e_mempool_destroy(pool);

    return ret;
}

static int camel_maildir_summary_add(CamelLocalSummary *cls, const char *name, int forceindex)
{
    CamelMaildirSummary *maildirs = (CamelMaildirSummary *)cls;
    char *filename = g_strdup_printf("%s/cur/%s", cls->folder_path, name);
    int fd;
    CamelMimeParser *mp;

    d(printf("summarising: %s\n", name));

    fd = open(filename, O_RDONLY);
    if (fd == -1) {
        g_warning("Cannot summarise/index: %s: %s", filename, strerror(errno));
        g_free(filename);
        return -1;
    }
    mp = camel_mime_parser_new();
    camel_mime_parser_scan_from(mp, FALSE);
    camel_mime_parser_init_with_fd(mp, fd);
    if (cls->index && (forceindex || !camel_index_has_name(cls->index, name))) {
        d(printf("forcing indexing of message content\n"));
        camel_folder_summary_set_index((CamelFolderSummary *)maildirs, cls->index);
    } else {
        camel_folder_summary_set_index((CamelFolderSummary *)maildirs, NULL);
    }
    maildirs->priv->current_file = (char *)name;
    camel_folder_summary_add_from_parser((CamelFolderSummary *)maildirs, mp);
    camel_object_unref((CamelObject *)mp);
    maildirs->priv->current_file = NULL;
    camel_folder_summary_set_index((CamelFolderSummary *)maildirs, NULL);
    g_free(filename);
    return 0;
}

static void
remove_summary(char *key, CamelMessageInfo *info, CamelLocalSummary *cls)
{
    d(printf("removing message %s from summary\n", key));
    if (cls->index)
        camel_index_delete_name(cls->index, camel_message_info_uid(info));
    camel_folder_summary_remove((CamelFolderSummary *)cls, info);
    camel_folder_summary_info_free((CamelFolderSummary *)cls, info);
}

static int
sort_receive_cmp(const void *ap, const void *bp)
{
    const CamelMessageInfo
        *a = *((CamelMessageInfo **)ap),
        *b = *((CamelMessageInfo **)bp);

    if (a->date_received < b->date_received)
        return -1;
    else if (a->date_received > b->date_received)
        return 1;

    return 0;
}

static int
maildir_summary_check(CamelLocalSummary *cls, CamelFolderChangeInfo *changes, CamelException *ex)
{
    DIR *dir;
    struct dirent *d;
    char *p;
    CamelMessageInfo *info;
    CamelMaildirMessageInfo *mdi;
    CamelFolderSummary *s = (CamelFolderSummary *)cls;
    GHashTable *left;
    int i, count, total;
    int forceindex;
    char *new, *cur;
    char *uid;

    new = g_strdup_printf("%s/new", cls->folder_path);
    cur = g_strdup_printf("%s/cur", cls->folder_path);

    /* FIXME: Handle changeinfo */

    d(printf("checking summary ...\n"));

    camel_operation_start(NULL, _("Checking folder consistency"));

    /* scan the directory, check for mail files not in the index, or index entries that
       no longer exist */
    dir = opendir(cur);
    if (dir == NULL) {
        camel_exception_setv(ex, 1, _("Cannot open maildir directory path: %s: %s"), cls->folder_path, strerror(errno));
        g_free(cur);
        g_free(new);
        camel_operation_end(NULL);
        return -1;
    }

    /* keeps track of all uid's that have not been processed */
    left = g_hash_table_new(g_str_hash, g_str_equal);
    count = camel_folder_summary_count((CamelFolderSummary *)cls);
    forceindex = count == 0;
    for (i=0;i<count;i++) {
        info = camel_folder_summary_index((CamelFolderSummary *)cls, i);
        if (info) {
            g_hash_table_insert(left, (char *)camel_message_info_uid(info), info);
        }
    }

    /* joy, use this to pre-count the total, so we can report progress meaningfully */
    total = 0;
    count = 0;
    while ( (d = readdir(dir)) )
        total++;
    rewinddir(dir);

    while ( (d = readdir(dir)) ) {
        int pc = count * 100 / total;

        camel_operation_progress(NULL, pc);
        count++;

        /* FIXME: also run stat to check for regular file */
        p = d->d_name;
        if (p[0] == '.')
            continue;

        /* map the filename -> uid */
        uid = strchr(d->d_name, ':');
        if (uid)
            uid = g_strndup(d->d_name, uid-d->d_name);
        else
            uid = g_strdup(d->d_name);

        info = camel_folder_summary_uid((CamelFolderSummary *)cls, uid);
        if (info == NULL || (cls->index && (!camel_index_has_name(cls->index, uid)))) {
            /* need to add this file to the summary */
            if (info != NULL) {
                CamelMessageInfo *old = g_hash_table_lookup(left, camel_message_info_uid(info));
                if (old) {
                    g_hash_table_remove(left, uid);
                    camel_folder_summary_info_free((CamelFolderSummary *)cls, old);
                }
                camel_folder_summary_remove((CamelFolderSummary *)cls, info);
                camel_folder_summary_info_free((CamelFolderSummary *)cls, info);
            }
            camel_maildir_summary_add(cls, d->d_name, forceindex);
        } else {
            const char *filename;
            CamelMessageInfo *old;

            old = g_hash_table_lookup(left, camel_message_info_uid(info));
            if (old) {
                camel_folder_summary_info_free((CamelFolderSummary *)cls, old);
                g_hash_table_remove(left, camel_message_info_uid(info));
            }

            mdi = (CamelMaildirMessageInfo *)info;
            filename = camel_maildir_info_filename(mdi);
            /* TODO: only store the extension in the mdi->filename struct, not the whole lot */
            if (filename == NULL || strcmp(filename, d->d_name) != 0) {
#ifdef DOESTRV
#warning "cannot modify the estrv after its been setup, for mt-safe code"
                CAMEL_SUMMARY_LOCK(s, summary_lock);
                /* need to update the summary hash ref */
                g_hash_table_remove(s->messages_uid, camel_message_info_uid(info));
                info->strings = e_strv_set_ref(info->strings, CAMEL_MAILDIR_INFO_FILENAME, d->d_name);
                info->strings = e_strv_pack(info->strings);
                g_hash_table_insert(s->messages_uid, (char *)camel_message_info_uid(info), info);
                CAMEL_SUMMARY_UNLOCK(s, summary_lock);
#else
# ifdef DOEPOOLV
                info->strings = e_poolv_set(info->strings, CAMEL_MAILDIR_INFO_FILENAME, d->d_name, FALSE);
# else  
                g_free(mdi->filename);
                mdi->filename = g_strdup(d->d_name);
# endif
#endif
            }
            camel_folder_summary_info_free((CamelFolderSummary *)cls, info);
        }
        g_free(uid);
    }
    closedir(dir);
    g_hash_table_foreach(left, (GHFunc)remove_summary, cls);
    g_hash_table_destroy(left);

    camel_operation_end(NULL);

    camel_operation_start(NULL, _("Checking for new messages"));

    /* now, scan new for new messages, and copy them to cur, and so forth */
    dir = opendir(new);
    if (dir != NULL) {
        total = 0;
        count = 0;
        while ( (d = readdir(dir)) )
            total++;
        rewinddir(dir);

        while ( (d = readdir(dir)) ) {
            char *name, *newname, *destname, *destfilename;
            char *src, *dest;
            int pc = count * 100 / total;

            camel_operation_progress(NULL, pc);
            count++;

            name = d->d_name;
            if (name[0] == '.')
                continue;

            /* already in summary?  shouldn't happen, but just incase ... */
            if ((info = camel_folder_summary_uid((CamelFolderSummary *)cls, name))) {
                camel_folder_summary_info_free((CamelFolderSummary *)cls, info);
                newname = destname = camel_folder_summary_next_uid_string(s);
            } else {
                newname = NULL;
                destname = name;
            }

            /* copy this to the destination folder, use 'standard' semantics for maildir info field */
            src = g_strdup_printf("%s/%s", new, name);
            destfilename = g_strdup_printf("%s:2,", destname);
            dest = g_strdup_printf("%s/%s", cur, destfilename);

            /* FIXME: This should probably use link/unlink */

            if (rename(src, dest) == 0) {
                camel_maildir_summary_add(cls, destfilename, forceindex);
                if (changes) {
                    camel_folder_change_info_add_uid(changes, destname);
                    camel_folder_change_info_recent_uid(changes, destname);
                }
            } else {
                /* else?  we should probably care about failures, but wont */
                g_warning("Failed to move new maildir message %s to cur %s", src, dest);
            }

            /* c strings are painful to work with ... */
            g_free(destfilename);
            g_free(newname);
            g_free(src);
            g_free(dest);
        }
        camel_operation_end(NULL);
    }
    closedir(dir);

    g_free(new);
    g_free(cur);

    /* sort the summary based on receive time, since the directory order is not useful */
    CAMEL_SUMMARY_LOCK(s, summary_lock);
    qsort(s->messages->pdata, s->messages->len, sizeof(CamelMessageInfo *), sort_receive_cmp);
    CAMEL_SUMMARY_UNLOCK(s, summary_lock);

    return 0;
}

/* sync the summary with the ondisk files. */
static int
maildir_summary_sync(CamelLocalSummary *cls, gboolean expunge, CamelFolderChangeInfo *changes, CamelException *ex)
{
    int count, i;
    CamelMessageInfo *info;
    CamelMaildirMessageInfo *mdi;
#ifdef DOESTRV
    CamelFolderSummary *s = (CamelFolderSummary *)cls;
#endif
    char *name;
    struct stat st;

    d(printf("summary_sync(expunge=%s)\n", expunge?"true":"false"));

    if (camel_local_summary_check(cls, changes, ex) == -1)
        return -1;

    camel_operation_start(NULL, _("Storing folder"));

    count = camel_folder_summary_count((CamelFolderSummary *)cls);
    for (i=count-1;i>=0;i--) {
        camel_operation_progress(NULL, (count-i)*100/count);

        info = camel_folder_summary_index((CamelFolderSummary *)cls, i);
        mdi = (CamelMaildirMessageInfo *)info;
        if (info && (info->flags & CAMEL_MESSAGE_DELETED) && expunge) {
            name = g_strdup_printf("%s/cur/%s", cls->folder_path, camel_maildir_info_filename(mdi));
            d(printf("deleting %s\n", name));
            if (unlink(name) == 0 || errno==ENOENT) {

                /* FIXME: put this in folder_summary::remove()? */
                if (cls->index)
                    camel_index_delete_name(cls->index, camel_message_info_uid(info));

                camel_folder_change_info_remove_uid(changes, camel_message_info_uid(info));
                camel_folder_summary_remove((CamelFolderSummary *)cls, info);
            }
            g_free(name);
        } else if (info && (info->flags & CAMEL_MESSAGE_FOLDER_FLAGGED)) {
            char *newname = camel_maildir_summary_info_to_name(info);
            char *dest;

            /* do we care about additional metainfo stored inside the message? */
            /* probably should all go in the filename? */

            /* have our flags/ i.e. name changed? */
            if (strcmp(newname, camel_maildir_info_filename(mdi))) {
                name = g_strdup_printf("%s/cur/%s", cls->folder_path, camel_maildir_info_filename(mdi));
                dest = g_strdup_printf("%s/cur/%s", cls->folder_path, newname);
                rename(name, dest);
                if (stat(dest, &st) == -1) {
                    /* we'll assume it didn't work, but dont change anything else */
                    g_free(newname);
                } else {
                    /* TODO: If this is made mt-safe, then this code could be a problem, since
                       the estrv is being modified.
                       Sigh, this may mean the maildir name has to be cached another way */
#ifdef DOESTRV
#warning "cannot modify the estrv after its been setup, for mt-safe code"
                    CAMEL_SUMMARY_LOCK(s, summary_lock);
                    /* need to update the summary hash ref */
                    g_hash_table_remove(s->messages_uid, camel_message_info_uid(info));
                    info->strings = e_strv_set_ref_free(info->strings, CAMEL_MAILDIR_INFO_FILENAME, newname);
                    info->strings = e_strv_pack(info->strings);
                    g_hash_table_insert(s->messages_uid, (char *)camel_message_info_uid(info), info);
                    CAMEL_SUMMARY_UNLOCK(s, summary_lock);
#else
# ifdef DOEPOOLV
                    info->strings = e_poolv_set(info->strings, CAMEL_MAILDIR_INFO_FILENAME, newname, TRUE);
# else
                    g_free(mdi->filename);
                    mdi->filename = newname;
# endif
#endif
                }
                g_free(name);
                g_free(dest);
            } else {
                g_free(newname);
            }

            /* strip FOLDER_MESSAGE_FLAGED, etc */
            info->flags &= 0xffff;
        }
        camel_folder_summary_info_free((CamelFolderSummary *)cls, info);
    }

    camel_operation_end(NULL);

    return ((CamelLocalSummaryClass *)parent_class)->sync(cls, expunge, changes, ex);
}