path: root/camel/providers/mh/camel-mh-summary.c

/*
 *  Copyright (C) 2000 Helix Code 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 the GNU Library General Public License
 *  as published by the Free Software Foundation; either version 2 of
 *  the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

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

#include <sys/stat.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>

#define d(x)

#define CAMEL_MH_SUMMARY_VERSION (0x2000)

static CamelMessageInfo *message_info_new(CamelFolderSummary *, struct _header_raw *);

static void camel_mh_summary_class_init (CamelMhSummaryClass *class);
static void camel_mh_summary_init   (CamelMhSummary *gspaper);
static void camel_mh_summary_finalise   (CamelObject *obj);

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

struct _CamelMhSummaryPrivate {
    char *current_uid;
};

static CamelFolderSummaryClass *parent_class;

CamelType
camel_mh_summary_get_type (void)
{
    static CamelType type = CAMEL_INVALID_TYPE;
    
    if (type == CAMEL_INVALID_TYPE) {
        type = camel_type_register(camel_folder_summary_get_type (), "CamelMhSummary",
                       sizeof(CamelMhSummary),
                       sizeof(CamelMhSummaryClass),
                       (CamelObjectClassInitFunc)camel_mh_summary_class_init,
                       NULL,
                       (CamelObjectInitFunc)camel_mh_summary_init,
                       (CamelObjectFinalizeFunc)camel_mh_summary_finalise);
    }
    
    return type;
}

static void
camel_mh_summary_class_init (CamelMhSummaryClass *class)
{
    CamelFolderSummaryClass *sklass = (CamelFolderSummaryClass *) class;
    
    parent_class = CAMEL_FOLDER_SUMMARY_CLASS (camel_type_get_global_classfuncs(camel_folder_summary_get_type ()));

    /* override methods */
    sklass->message_info_new = message_info_new;
}

static void
camel_mh_summary_init (CamelMhSummary *o)
{
    struct _CamelFolderSummary *s = (CamelFolderSummary *) o;

    o->priv = g_malloc0(sizeof(*o->priv));

    /* set unique file version */
    s->version += CAMEL_MH_SUMMARY_VERSION;
}

static void
camel_mh_summary_finalise(CamelObject *obj)
{
    CamelMhSummary *o = (CamelMhSummary *)obj;

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

/**
 * camel_mh_summary_new:
 *
 * Create a new CamelMhSummary object.
 * 
 * Return value: A new #CamelMhSummary object.
 **/
CamelMhSummary  *camel_mh_summary_new   (const char *filename, const char *mhdir, ibex *index)
{
    CamelMhSummary *o = (CamelMhSummary *)camel_object_new(camel_mh_summary_get_type ());

    camel_folder_summary_set_build_content((CamelFolderSummary *)o, TRUE);
    camel_folder_summary_set_filename((CamelFolderSummary *)o, filename);
    o->mh_path = g_strdup(mhdir);
    o->index = index;
    return o;
}

static CamelMessageInfo *message_info_new(CamelFolderSummary * s, struct _header_raw *h)
{
    CamelMessageInfo *mi;
    CamelMhSummary *mhs = (CamelMhSummary *)s;

    mi = ((CamelFolderSummaryClass *) parent_class)->message_info_new(s, h);
    if (mi) {
        /* it only ever indexes 1 message at a time */
        mi->uid = g_strdup(mhs->priv->current_uid);
    }

    return mi;
}

int     camel_mh_summary_load(CamelMhSummary * mhs, int forceindex)
{
    CamelFolderSummary *s = CAMEL_FOLDER_SUMMARY(mhs);

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

    if (forceindex || camel_folder_summary_load(s) == -1) {
        camel_folder_summary_clear(s);
    }
    return camel_mh_summary_check(mhs, forceindex);
}

int     camel_mh_summary_add(CamelMhSummary * mhs, const char *name, int forceindex)
{
    char *filename = g_strdup_printf("%s/%s", mhs->mh_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 (mhs->index && (forceindex || !ibex_contains_name(mhs->index, (char *)name))) {
        d(printf("forcing indexing of message content\n"));
        camel_folder_summary_set_index((CamelFolderSummary *)mhs, mhs->index);
    } else {
        camel_folder_summary_set_index((CamelFolderSummary *)mhs, NULL);
    }
    mhs->priv->current_uid = (char *)name;
    camel_folder_summary_add_from_parser((CamelFolderSummary *)mhs, mp);
    camel_object_unref((CamelObject *)mp);
    mhs->priv->current_uid = NULL;
    camel_folder_summary_set_index((CamelFolderSummary *)mhs, NULL);
    g_free(filename);
    return 0;
}

static void
remove_summary(char *key, CamelMessageInfo *info, CamelMhSummary *mhs)
{
    d(printf("removing message %s from summary\n", key));
    if (mhs->index)
        ibex_unindex(mhs->index, info->uid);
    camel_folder_summary_remove((CamelFolderSummary *)mhs, info);
}

int     camel_mh_summary_check(CamelMhSummary * mhs, int forceindex)
{
    DIR *dir;
    struct dirent *d;
    char *p, c;
    CamelMessageInfo *info;
    GHashTable *left;
    int i, count;

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

    /* scan the directory, check for mail files not in the index, or index entries that
       no longer exist */
    dir = opendir(mhs->mh_path);
    if (dir == 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 *)mhs);
    for (i=0;i<count;i++) {
        info = camel_folder_summary_index((CamelFolderSummary *)mhs, i);
        if (info) {
            g_hash_table_insert(left, info->uid, info);
        }
    }
    while ( (d = readdir(dir)) ) {
        /* FIXME: also run stat to check for regular file */
        p = d->d_name;
        while ( (c = *p++) ) {
            if (!isdigit(c))
                break;
        }
        if (c==0) {
            info = camel_folder_summary_uid((CamelFolderSummary *)mhs, d->d_name);
            if (info == NULL || (mhs->index && (!ibex_contains_name(mhs->index, d->d_name)))) {
                /* need to add this file to the summary */
                if (info != NULL) {
                    g_hash_table_remove(left, info->uid);
                    camel_folder_summary_remove((CamelFolderSummary *)mhs, info);
                }
                camel_mh_summary_add(mhs, d->d_name, forceindex);
            } else {
                g_hash_table_remove(left, info->uid);
            }
        }
    }
    closedir(dir);
    g_hash_table_foreach(left, (GHFunc)remove_summary, mhs);
    g_hash_table_destroy(left);

    /* force a save of the index, just to make sure */
    /* note this could be expensive so possibly shouldn't be here
       as such */
    if (mhs->index) {
        ibex_save(mhs->index);
    }

    return 0;
}

/* sync the summary with the ondisk files.
   It doesnt store the state in the file, the summary only, == MUCH faster */
int     camel_mh_summary_sync(CamelMhSummary * mhs, int expunge, CamelFolderChangeInfo *changes, CamelException *ex)
{
    int count, i;
    CamelMessageInfo *info;
    char *name;

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

    if (mhs->index) {
        ibex_save(mhs->index);
    }
    if (!expunge)
        return 0;

    count = camel_folder_summary_count((CamelFolderSummary *)mhs);
    for (i=count-1;i>=0;i--) {
        info = camel_folder_summary_index((CamelFolderSummary *)mhs, i);
        if (info && info->flags & CAMEL_MESSAGE_DELETED) {
            name = g_strdup_printf("%s/%s", mhs->mh_path, info->uid);
            d(printf("deleting %s\n", name));
            if (unlink(name) == 0 || errno==ENOENT) {
                camel_folder_change_info_remove_uid(changes, info->uid);
                camel_folder_summary_remove((CamelFolderSummary *)mhs, info);
            }
        }
    }
    return 0;
}