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path: root/camel/providers/MH/mh-uid.c
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/* 
 *
 * Copyright (C) 1999 Bertrand Guiheneuf <Bertrand.Guiheneuf@aful.org> .
 *
 * This program is free software; you can redistribute it and/or 
 * modify it under the terms of the GNU General Public License as 
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */


#include <config.h> 

#include "mh-uid.h"
#include "camel-log.h"
#include "camel-stream.h"
#include "camel-stream-fs.h"
#include "camel-stream-buffered-fs.h"
#include "gmime-utils.h"
#include "md5-utils.h"
#include "mh-utils.h"

#include <sys/stat.h> 
#include <unistd.h>
#include <sys/types.h>
#include <fcntl.h>
#include <dirent.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>

void
mh_uid_get_for_file (gchar *filename, guchar uid[16])
{
    CamelStream *message_stream;
    GArray *header_array;
    Rfc822Header *cur_header;
    int i;
    MD5Context ctx;


    message_stream = camel_stream_buffered_fs_new_with_name (filename, 
                                 CAMEL_STREAM_BUFFERED_FS_READ);
    header_array = get_header_array_from_stream (message_stream);
    gtk_object_unref (GTK_OBJECT (message_stream));
    
    md5_init (&ctx);
    for (i=0; i<header_array->len; i++) {
        cur_header = (Rfc822Header *)header_array->data + i;
        if (!g_strcasecmp (cur_header->name, "subject")) {
            md5_update (&ctx, cur_header->value, strlen (cur_header->value));
        } else if (!g_strcasecmp (cur_header->name, "sender")) {
            md5_update (&ctx, cur_header->value, strlen (cur_header->value));
        } else if (!g_strcasecmp (cur_header->name, "date")) {
            md5_update (&ctx, cur_header->value, strlen (cur_header->value));           
        }
        
        g_free (cur_header->name);
        g_free (cur_header->value);
        
    }
    
    g_array_free (header_array, TRUE);
    
    md5_final (uid, &ctx);
}




void 
mh_save_uid_list (CamelMhFolder *mh_folder)
{
    GArray *uid_array;
    MhUidCouple *first_uid_couple;
    gchar *directory_path = mh_folder->directory_path;
    gchar *uidfile_path;
    int fd;
    int i;
    
    
    uidfile_path = g_strdup_printf ("%s/%s", directory_path, ".camel-uid-list");
    CAMEL_LOG_FULL_DEBUG ("In the process of writing %s\n", uidfile_path);
    fd = open (uidfile_path, O_WRONLY | O_CREAT );
    
    if (!fd) {
        CAMEL_LOG_FULL_DEBUG ("could not open file %s for writing. Exiting.\n", uidfile_path);
        g_free (uidfile_path);
        return;
    }
    g_free (uidfile_path);

    uid_array = mh_folder->uid_array;
    first_uid_couple = (MhUidCouple *)uid_array->data;

    /* write the number of uid contained in the file */
    write (fd, &(uid_array->len), sizeof (guint));
    CAMEL_LOG_FULL_DEBUG ("%d entrie present in the list\n", uid_array->len);
    /* now write the array of uid self */
    write (fd, first_uid_couple, sizeof (MhUidCouple) * uid_array->len);
    
    close (fd);
}


gint 
mh_load_uid_list (CamelMhFolder *mh_folder)
{
    GArray *new_uid_array;
    MhUidCouple *first_uid_couple;
    gchar *directory_path = mh_folder->directory_path;
    gchar *uidfile_path;
    int fd;
    guint uid_nb;
    struct stat stat_buf;
    gint stat_error = 0;
    
    uidfile_path = g_strdup_printf ("%s/%s", directory_path, ".camel-uid-list");

    /* tests if file exists */
    stat_error = stat (uidfile_path, &stat_buf);
    

    if (!((stat_error != -1) && S_ISREG (stat_buf.st_mode))) {
        CAMEL_LOG_FULL_DEBUG ("CamelMhFolder::load_uid_list "
                      "file %s does not exist. Exiting.\n", uidfile_path);
        g_free (uidfile_path);
        return -1;
    }

    fd = open (uidfile_path, O_RDONLY);
    g_free (uidfile_path);
    if (!fd) return -1;
    
    if (mh_folder->uid_array) g_array_free (mh_folder->uid_array, FALSE);

    /* read the number of uids in the file */
    read (fd, &uid_nb, sizeof (guint));
    CAMEL_LOG_FULL_DEBUG ("reading %d uid_entries\n", uid_nb);
    new_uid_array = g_array_new (FALSE, FALSE, sizeof (MhUidCouple));
    new_uid_array = g_array_set_size (new_uid_array, uid_nb);
    first_uid_couple = (MhUidCouple *)new_uid_array->data;
    
    
    read (fd, first_uid_couple, sizeof (MhUidCouple) * uid_nb);
    
    mh_folder->uid_array = new_uid_array;       

    return 1;
}


gint 
mh_generate_uid_list (CamelMhFolder *mh_folder)
{   
    GArray *new_uid_array;
    const gchar *directory_path;
    struct dirent *dir_entry;
    DIR *dir_handle;
    gchar *msg_path;
    guint msg_count;    
    MhUidCouple *uid_couple;
    guint file_number;

    g_assert (mh_folder);
    CAMEL_LOG_FULL_DEBUG ("in the process of creating uid list \n");
    directory_path = mh_folder->directory_path;
    if (!directory_path) {
        CAMEL_LOG_FULL_DEBUG ("folder has no directory path. Exiting\n");
        return -1;
    }
        
    msg_count = camel_folder_get_message_count (CAMEL_FOLDER (mh_folder), NULL);
    if (!msg_count) {
        CAMEL_LOG_FULL_DEBUG ("no message in %s. Exiting\n", directory_path);
        return -1;
    }
    
    new_uid_array = g_array_new (FALSE, FALSE, sizeof (MhUidCouple));
    new_uid_array = g_array_set_size (new_uid_array, msg_count);
    uid_couple = (MhUidCouple *)new_uid_array->data;

    dir_handle = opendir (directory_path);
    
    /* read first entry in the directory */
    dir_entry = readdir (dir_handle);
    while (dir_entry != NULL) {

        /* tests if the entry correspond to a message file */
        if (mh_is_a_message_file (dir_entry->d_name, directory_path)) {
                        
            /* get the uid for this message */
            msg_path = g_strdup_printf ("%s/%s", directory_path, dir_entry->d_name);
            mh_uid_get_for_file (msg_path, uid_couple->uid);
            g_free (msg_path);

            /* convert filename into file number */
            uid_couple->file_number = atoi (dir_entry->d_name);
            uid_couple++;
        }
            
        /* read next entry */
        dir_entry = readdir (dir_handle);
    }

    closedir (dir_handle);
    mh_folder->uid_array = new_uid_array;
}