path: root/camel/providers/imap/camel-imap-wrapper.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; -*- */
/* camel-imap-wrapper.c: data wrapper for offline IMAP data */

/*
 * Author: Dan Winship <danw@ximian.com>
 *
 * Copyright 2000 Ximian, Inc. (www.ximian.com)
 *
 * 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 <errno.h>
#include <string.h>

#include "camel-imap-folder.h"
#include "camel-imap-wrapper.h"
#include "camel-imap-private.h"
#include "camel-exception.h"
#include "camel-stream-filter.h"
#include "camel-mime-filter-basic.h"
#include "camel-mime-filter-crlf.h"
#include "camel-mime-filter-charset.h"
#include "camel-mime-part.h"

static CamelDataWrapperClass *parent_class = NULL;

/* Returns the class for a CamelDataWrapper */
#define CDW_CLASS(so) CAMEL_DATA_WRAPPER_CLASS (CAMEL_OBJECT_GET_CLASS(so))

static ssize_t write_to_stream (CamelDataWrapper *imap_wrapper, CamelStream *stream);

static void
camel_imap_wrapper_class_init (CamelImapWrapperClass *camel_imap_wrapper_class)
{
    CamelDataWrapperClass *camel_data_wrapper_class =
        CAMEL_DATA_WRAPPER_CLASS (camel_imap_wrapper_class);

    parent_class = CAMEL_DATA_WRAPPER_CLASS (camel_type_get_global_classfuncs (camel_data_wrapper_get_type ()));

    /* virtual method override */
    camel_data_wrapper_class->write_to_stream = write_to_stream;
}

static void
camel_imap_wrapper_finalize (CamelObject *object)
{
    CamelImapWrapper *imap_wrapper = CAMEL_IMAP_WRAPPER (object);

    if (imap_wrapper->folder)
        camel_object_unref (CAMEL_OBJECT (imap_wrapper->folder));
    if (imap_wrapper->uid)
        g_free (imap_wrapper->uid);
    if (imap_wrapper->part)
        g_free (imap_wrapper->part_spec);

#ifdef ENABLE_THREADS
    g_mutex_free (imap_wrapper->priv->lock);
#endif
    g_free (imap_wrapper->priv);
}

static void
camel_imap_wrapper_init (gpointer object, gpointer klass)
{
    CamelImapWrapper *imap_wrapper = CAMEL_IMAP_WRAPPER (object);

    imap_wrapper->priv = g_new0 (struct _CamelImapWrapperPrivate, 1);
#ifdef ENABLE_THREADS
    imap_wrapper->priv->lock = g_mutex_new ();
#endif
}

CamelType
camel_imap_wrapper_get_type (void)
{
    static CamelType type = CAMEL_INVALID_TYPE;

    if (type == CAMEL_INVALID_TYPE) {
        type = camel_type_register (
            CAMEL_DATA_WRAPPER_TYPE,
            "CamelImapWrapper",
            sizeof (CamelImapWrapper),
            sizeof (CamelImapWrapperClass),
            (CamelObjectClassInitFunc) camel_imap_wrapper_class_init,
            NULL,
            (CamelObjectInitFunc) camel_imap_wrapper_init,
            (CamelObjectFinalizeFunc) camel_imap_wrapper_finalize);
    }

    return type;
}


static void
imap_wrapper_hydrate (CamelImapWrapper *imap_wrapper, CamelStream *stream)
{
    CamelDataWrapper *data_wrapper = (CamelDataWrapper *) imap_wrapper;
    
    camel_object_ref (stream);
    data_wrapper->stream = stream;
    data_wrapper->offline = FALSE;
    
    camel_object_unref (imap_wrapper->folder);
    imap_wrapper->folder = NULL;
    g_free (imap_wrapper->uid);
    imap_wrapper->uid = NULL;
    g_free (imap_wrapper->part_spec);
    imap_wrapper->part = NULL;
}


static ssize_t
write_to_stream (CamelDataWrapper *data_wrapper, CamelStream *stream)
{
    CamelImapWrapper *imap_wrapper = CAMEL_IMAP_WRAPPER (data_wrapper);
    
    CAMEL_IMAP_WRAPPER_LOCK (imap_wrapper, lock);
    if (data_wrapper->offline) {
        CamelStream *datastream;
        
        datastream = camel_imap_folder_fetch_data (
            imap_wrapper->folder, imap_wrapper->uid,
            imap_wrapper->part_spec, FALSE, NULL);
        if (!datastream) {
            CAMEL_IMAP_WRAPPER_UNLOCK (imap_wrapper, lock);
            errno = ENETUNREACH;
            return -1;
        }
        
        imap_wrapper_hydrate (imap_wrapper, datastream);
        camel_object_unref (datastream);
    }
    CAMEL_IMAP_WRAPPER_UNLOCK (imap_wrapper, lock);
    
    return parent_class->write_to_stream (data_wrapper, stream);
}


CamelDataWrapper *
camel_imap_wrapper_new (CamelImapFolder *imap_folder,
            CamelContentType *type, CamelTransferEncoding encoding,
            const char *uid, const char *part_spec,
            CamelMimePart *part)
{
    CamelImapWrapper *imap_wrapper;
    CamelStream *stream;

    imap_wrapper = (CamelImapWrapper *)camel_object_new(camel_imap_wrapper_get_type());

    camel_data_wrapper_set_mime_type_field (CAMEL_DATA_WRAPPER (imap_wrapper), type);
    ((CamelDataWrapper *)imap_wrapper)->offline = TRUE;
    ((CamelDataWrapper *)imap_wrapper)->encoding = encoding;

    imap_wrapper->folder = imap_folder;
    camel_object_ref (imap_folder);
    imap_wrapper->uid = g_strdup (uid);
    imap_wrapper->part_spec = g_strdup (part_spec);

    /* Don't ref this, it's our parent. */
    imap_wrapper->part = part;

    /* Try the cache. */
    stream = camel_imap_folder_fetch_data (imap_folder, uid, part_spec,
                           TRUE, NULL);
    if (stream) {
        imap_wrapper_hydrate (imap_wrapper, stream);
        camel_object_unref (stream);
    }

    return (CamelDataWrapper *)imap_wrapper;
}