change the CamelFolderSummary interfaces to allow partial summary queries

	* camel-folder-summary.[ch]: change the CamelFolderSummary
	interfaces to allow partial summary queries (for dealing
	with very large folders). Remove the "extended_fields" from
	CamelFolderInfo and CamelMessageInfo: this is better dealt
	with by subtyping.

	* providers/mbox/camel-mbox-summary.[ch]: Make CamelMboxSummary a
	subclass of CamelFolderSummary. Update interfaces for that. Remove
	the internal/external summary distinction. Remove the (unused) md5
	checksum in the folder summary. Change the summary file format
	(primarily to make it no longer byte-order dependent) and add a
	version number to it so it will be easier to change in the future.

	* providers/mbox/camel-mbox-folder.[ch]
	* providers/mbox/camel-mbox-search.c
	* providers/mbox/camel-mbox-utils.c: update for summary changes

	* camel-exception-list.def: add
	CAMEL_EXCEPTION_FOLDER_SUMMARY_INVALID

svn path=/trunk/; revision=2159

10 files changed, 589 insertions, 543 deletions

diff --git a/camel/ChangeLog b/camel/ChangeLog
index f8f8b91e12..428bffc459 100644
--- a/camel/ChangeLog
+++ b/camel/ChangeLog
@@ -1,3 +1,25 @@
+2000-03-25  Dan Winship  <danw@helixcode.com>
+
+	* camel-folder-summary.[ch]: change the CamelFolderSummary
+	interfaces to allow partial summary queries (for dealing
+	with very large folders). Remove the "extended_fields" from
+	CamelFolderInfo and CamelMessageInfo: this is better dealt
+	with by subtyping.
+
+	* providers/mbox/camel-mbox-summary.[ch]: Make CamelMboxSummary a
+	subclass of CamelFolderSummary. Update interfaces for that. Remove
+	the internal/external summary distinction. Remove the (unused) md5
+	checksum in the folder summary. Change the summary file format
+	(primarily to make it no longer byte-order dependent) and add a
+	version number to it so it will be easier to change in the future.
+	
+	* providers/mbox/camel-mbox-folder.[ch]
+	* providers/mbox/camel-mbox-search.c
+	* providers/mbox/camel-mbox-utils.c: update for summary changes
+
+	* camel-exception-list.def: add
+	CAMEL_EXCEPTION_FOLDER_SUMMARY_INVALID
+	
 2000-03-23  NotZed  <NotZed@HelixCode.com>
 
 	* providers/mbox/camel-mbox-provider.c: Added flag to provider
diff --git a/camel/camel-exception-list.def b/camel/camel-exception-list.def
index e99f0c90d9..825196920c 100644
--- a/camel/camel-exception-list.def
+++ b/camel/camel-exception-list.def
@@ -21,6 +21,7 @@ CAMEL_EXCEPTION_FOLDER_NON_UID,
 CAMEL_EXCEPTION_FOLDER_INSUFFICIENT_PERMISSION,
 CAMEL_EXCEPTION_FOLDER_INVALID_PATH,
 CAMEL_EXCEPTION_FOLDER_INVALID_UID,
+CAMEL_EXCEPTION_FOLDER_SUMMARY_INVALID,
 
 /* CamelStoreException */
 CAMEL_EXCEPTION_STORE_NULL = 200,
diff --git a/camel/camel-folder-summary.c b/camel/camel-folder-summary.c
index edc9a11d44..288bb686b2 100644
--- a/camel/camel-folder-summary.c
+++ b/camel/camel-folder-summary.c
@@ -28,46 +28,29 @@
 #include "camel-folder-summary.h"
 #include "camel-log.h"
 
-static GtkObjectClass *parent_class=NULL;
+static GtkObjectClass *parent_class = NULL;
 
 /* Returns the class for a CamelFolderSummary */
 #define CFS_CLASS(so) CAMEL_FOLDER_SUMMARY_CLASS (GTK_OBJECT(so)->klass)
 
 
-static const GArray *_get_subfolder_info_list (CamelFolderSummary *summary);
-static const GArray *_get_message_info_list (CamelFolderSummary *summary);
-
-static void _finalize (GtkObject *object);
+static int count_messages (CamelFolderSummary *summary);
+static int count_subfolders (CamelFolderSummary *summary);
+static GPtrArray *get_subfolder_info (CamelFolderSummary *summary,
+				      int first, int count);
+static GPtrArray *get_message_info (CamelFolderSummary *summary,
+				    int first, int count);
 
 static void
 camel_folder_summary_class_init (CamelFolderSummaryClass *camel_folder_summary_class)
 {
-	GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (camel_folder_summary_class);
-
 	parent_class = gtk_type_class (gtk_object_get_type ());
-	
-	/* virtual method definition */
-	camel_folder_summary_class->get_subfolder_info_list = _get_subfolder_info_list;
-	camel_folder_summary_class->get_message_info_list = _get_message_info_list;
-
-
-	/* virtual method overload */
-	gtk_object_class->finalize = _finalize;
-}
-
-
-
 
-
-static void
-camel_folder_summary_init (gpointer   object,  gpointer   klass)
-{
-	CamelFolderSummary *summary = CAMEL_FOLDER_SUMMARY (object);
-
-	CAMEL_LOG_FULL_DEBUG ( "camel_folder_summary_init:: Entering\n");
-	summary->subfolder_info_list = g_array_new (FALSE, FALSE, sizeof (CamelFolderInfo));
-	summary->message_info_list = g_array_new (FALSE, FALSE, sizeof (CamelMessageInfo));
-	CAMEL_LOG_FULL_DEBUG ( "camel_folder_summary_init:: Leaving\n");
+	/* virtual method definition */
+	camel_folder_summary_class->count_messages = count_messages;
+	camel_folder_summary_class->count_subfolders = count_subfolders;
+	camel_folder_summary_class->get_subfolder_info = get_subfolder_info;
+	camel_folder_summary_class->get_message_info = get_message_info;
 }
 
 
@@ -84,7 +67,7 @@ camel_folder_summary_get_type (void)
 			sizeof (CamelFolderSummary),
 			sizeof (CamelFolderSummaryClass),
 			(GtkClassInitFunc) camel_folder_summary_class_init,
-			(GtkObjectInitFunc) camel_folder_summary_init,
+			(GtkObjectInitFunc) NULL,
 				/* reserved_1 */ NULL,
 				/* reserved_2 */ NULL,
 			(GtkClassInitFunc) NULL,
@@ -97,66 +80,99 @@ camel_folder_summary_get_type (void)
 }
 
 
-static void           
-_finalize (GtkObject *object)
+static int
+count_messages (CamelFolderSummary *summary)
 {
-	CamelFolderSummary *camel_folder_summary = CAMEL_FOLDER_SUMMARY (object);
+	g_warning ("CamelFolderSummary::count_messages not implemented for `%s'", gtk_type_name (GTK_OBJECT_TYPE (summary)));
+	return 0;
+}
 
-	CAMEL_LOG_FULL_DEBUG ("Entering CamelFolderSummary::finalize\n");
-	CAMEL_LOG_FULL_DEBUG  ("CamelFolderSummary::finalize, finalizing object %p\n", object);
-	
-	parent_class->finalize (object);
-	CAMEL_LOG_FULL_DEBUG ("Leaving CamelFolderSummary::finalize\n");
+/**
+ * camel_folder_summary_count_messages: return the number of messages
+ * in the folder.
+ * @summary: the summary
+ *
+ * Return value: the number of messages in the folder.
+ **/
+int
+camel_folder_summary_count_messages (CamelFolderSummary *summary)
+{
+	return CFS_CLASS (summary)->count_messages (summary);
 }
 
 
-CamelFolderSummary *
-camel_folder_summary_new ()
+static int
+count_subfolders (CamelFolderSummary *summary)
 {
-	CamelFolderSummary *folder_summary;
-	
-	folder_summary = gtk_type_new (CAMEL_FOLDER_SUMMARY_TYPE);
-	folder_summary->message_info_list = g_array_new (FALSE, FALSE, sizeof (CamelMessageInfo));
-	folder_summary->subfolder_info_list = g_array_new (FALSE, FALSE, sizeof (CamelFolderInfo));
-
-	return folder_summary;
-	
+	g_warning ("CamelFolderSummary::count_subfolders not implemented for `%s'", gtk_type_name (GTK_OBJECT_TYPE (summary)));
+	return 0;
 }
 
-static const GArray *
-_get_subfolder_info_list (CamelFolderSummary *summary)
+/**
+ * camel_folder_summary_count_subfolders: return the number of subfolders
+ * in the folder.
+ * @summary: the summary
+ *
+ * Return value: the number of subfolders in the folder.
+ **/
+int
+camel_folder_summary_count_subfolders (CamelFolderSummary *summary)
 {
-	return summary->subfolder_info_list;
+	return CFS_CLASS (summary)->count_subfolders (summary);
 }
 
 
-const GArray *
-camel_folder_summary_get_subfolder_info_list (CamelFolderSummary *summary)
+static GPtrArray *
+get_subfolder_info (CamelFolderSummary *summary, int first, int count)
 {
-	return CFS_CLASS (summary)->get_subfolder_info_list (summary);
+	g_warning ("CamelFolderSummary::get_subfolder_info not implemented for `%s'", gtk_type_name (GTK_OBJECT_TYPE (summary)));
+	return NULL;
 }
 
+/**
+ * camel_folder_summary_get_subfolder_info: return an array of subfolders
+ * @summary: a summary
+ * @first: the index of the first subfolder to return information for
+ * (starting from 0)
+ * @count: the number of subfolders to return information for
+ *
+ * Returns an array of pointers to CamelFolderInfo objects. The caller
+ * must free the array when it is done with it, but should not modify
+ * the elements.
+ *
+ * Return value: an array containing information about the subfolders.
+ **/
+GPtrArray *
+camel_folder_summary_get_subfolder_info (CamelFolderSummary *summary,
+					 int first, int count)
+{
+	return CFS_CLASS (summary)->get_subfolder_info (summary, first, count);
+}
 
 
-
-static const GArray *
-_get_message_info_list (CamelFolderSummary *summary)
+static GPtrArray *
+get_message_info (CamelFolderSummary *summary, int first, int count)
 {
-	return summary->message_info_list;
+	g_warning ("CamelFolderSummary::get_message_info not implemented for `%s'", gtk_type_name (GTK_OBJECT_TYPE (summary)));
+	return NULL;
 }
 
-const GArray *
-camel_folder_summary_get_message_info_list (CamelFolderSummary *summary)
+/**
+ * camel_folder_summary_get_message_info: return an array of messages
+ * @summary: a summary
+ * @first: the index of the first message to return information for
+ * (starting from 0)
+ * @count: the number of messages to return information for
+ *
+ * Returns an array of pointers to CamelMessageInfo objects. The caller
+ * must free the array when it is done with it, but should not modify
+ * the elements.
+ *
+ * Return value: an array containing information about the messages.
+ **/
+GPtrArray *
+camel_folder_summary_get_message_info (CamelFolderSummary *summary,
+				       int first, int count)
 {
-	return CFS_CLASS (summary)->get_message_info_list (summary);
+	return CFS_CLASS (summary)->get_message_info (summary, first, count);
 }
-
-
-
-
-
-
-
-
-
-
diff --git a/camel/camel-folder-summary.h b/camel/camel-folder-summary.h
index 88fe86bd9f..720e09118f 100644
--- a/camel/camel-folder-summary.h
+++ b/camel/camel-folder-summary.h
@@ -51,8 +51,6 @@ typedef struct {
 	gint nb_message;
 	gint nb_unread_message;
 	gint nb_deleted_message;
-	
-	GHashTable *extended_fields;
 } CamelFolderInfo;
 
 
@@ -71,9 +69,6 @@ typedef struct {
 	
 	guint32 size;
 	gchar *uid;
-
-	GHashTable *extended_fields;
-
 } CamelMessageInfo;
 
 
@@ -81,9 +76,6 @@ typedef struct {
 
 struct _CamelFolderSummary {
 	GtkObject parent_object;
- 
-	GArray *subfolder_info_list; /* informations on subfolders */
-	GArray *message_info_list;   /* informations on messages */
 
 };
 
@@ -94,8 +86,13 @@ typedef struct {
 	GtkObjectClass parent_class;
 	
 	/* Virtual methods */	
-	const GArray *  (*get_subfolder_info_list) (CamelFolderSummary *summary);
-	const GArray *  (*get_message_info_list) (CamelFolderSummary *summary);
+	int (*count_messages) (CamelFolderSummary *summary);
+	int (*count_subfolders) (CamelFolderSummary *summary);
+
+	GPtrArray * (*get_subfolder_info) (CamelFolderSummary *summary,
+					   int first, int count);
+	GPtrArray * (*get_message_info) (CamelFolderSummary *summary,
+					 int first, int count);
 
 } CamelFolderSummaryClass;
 
@@ -106,11 +103,13 @@ GtkType camel_folder_summary_get_type (void);
 
 
 /* public methods */
-CamelFolderSummary *camel_folder_summary_new ();
+int camel_folder_summary_count_messages (CamelFolderSummary *summary);
+int camel_folder_summary_count_subfolders (CamelFolderSummary *summary);
 
-/* get information about the messages and the subfolders in the directory */
-const GArray *camel_folder_summary_get_subfolder_info_list (CamelFolderSummary *summary);
-const GArray *camel_folder_summary_get_message_info_list (CamelFolderSummary *summary);
+GPtrArray *camel_folder_summary_get_subfolder_info (CamelFolderSummary *summary,
+						    int first, int count);
+GPtrArray *camel_folder_summary_get_message_info (CamelFolderSummary *summary,
+						  int first, int count);
 
 
 
diff --git a/camel/providers/mbox/camel-mbox-folder.c b/camel/providers/mbox/camel-mbox-folder.c
index 8c7303924e..b8a18f201a 100644
--- a/camel/providers/mbox/camel-mbox-folder.c
+++ b/camel/providers/mbox/camel-mbox-folder.c
@@ -39,11 +39,9 @@
 #include "string-utils.h"
 #include "camel-log.h"
 #include "camel-stream-buffered-fs.h"
-#include "camel-folder-summary.h"
 #include "camel-mbox-summary.h"
 #include "camel-mbox-parser.h"
 #include "camel-mbox-utils.h"
-#include "md5-utils.h"
 #include "gmime-utils.h"
 #include "camel-mbox-search.h"
 #include "camel-data-wrapper.h"
@@ -196,7 +194,7 @@ _init (CamelFolder *folder, CamelStore *parent_store,
 	folder->has_summary_capability = TRUE;
 	folder->has_uid_capability = TRUE;
 	folder->has_search_capability = TRUE;
- 	folder->summary = camel_folder_summary_new ();
+ 	folder->summary = NULL;
 
 	CAMEL_LOG_FULL_DEBUG ("Leaving CamelMboxFolder::init_with_store\n");
 }
@@ -209,92 +207,74 @@ _init (CamelFolder *folder, CamelStore *parent_store,
    - load the summary or create it if necessary 
 */ 
 static void
-_check_get_or_maybe_generate_summary_file (CamelMboxFolder *mbox_folder, CamelException *ex)
+_check_get_or_maybe_generate_summary_file (CamelMboxFolder *mbox_folder,
+					   CamelException *ex)
 {
 	CamelFolder *folder = CAMEL_FOLDER (mbox_folder);
+	CamelMboxSummary *summ;
 	GArray *message_info_array;
-	gboolean summary_file_exists;
-	gboolean summary_file_is_sync;
-	GArray *mbox_summary_info;
 	gint mbox_file_fd;
 	guint32 next_uid;
 	guint32 file_size;
-
-	/* test for the existence of the summary file */
-	summary_file_exists = (access (mbox_folder->summary_file_path, F_OK) == 0);
-
-	/* if the summary file exists, test if the 
-	   md5 of the mbox file is still in sync
-	   with the one we had computed the last time
-	   we saved the summary file */
-	if (summary_file_exists) {
-		
-		summary_file_is_sync = 
-			camel_mbox_check_summary_sync (mbox_folder->summary_file_path,
-						       mbox_folder->folder_file_path,
-						       ex);
-		if (camel_exception_get_id (ex)) return;
+	struct stat st;
+
+	folder->summary = NULL;
+
+	/* Test for the existence and up-to-dateness of the summary file. */
+	if (stat (mbox_folder->summary_file_path, &st) == 0) {
+		summ = camel_mbox_summary_load (mbox_folder->summary_file_path,
+						ex);
+		if (summ) {
+			if (summ->mbox_file_size == st.st_size &&
+			    summ->mbox_modtime == st.st_mtime)
+				folder->summary = CAMEL_FOLDER_SUMMARY (summ);
+			else
+				gtk_object_destroy (GTK_OBJECT (summ));
+		} else {
+			/* Bad summary file */
+			if (camel_exception_get_id (ex) !=
+			    CAMEL_EXCEPTION_FOLDER_SUMMARY_INVALID)
+				return;
+			camel_exception_clear (ex);
+		}
 	}
 
-
-	/* in the case where the summary does not exist 
-	   or is not in sync with the mbox file
-	   regenerate it */
-	if ( !(summary_file_exists && summary_file_is_sync)) {
-		
-		/* parse the mbox folder and get some
-		   information about the messages */
-
+	/* In the case where the summary does not exist (or was the
+	 * wrong version), or is not in sync with the mbox file,
+	 * regenerate it.
+	 */
+	if (folder->summary == NULL) {
+		/* Parse the mbox folder and get some information
+		 * about the messages.
+		 */
 		mbox_file_fd = open (mbox_folder->folder_file_path, O_RDONLY);
-		message_info_array = camel_mbox_parse_file (mbox_file_fd, 
-							    "From ", 
-							    0,
-							    &file_size,
-							    &next_uid,
-							    TRUE,
-							    NULL,
-							    0,
-							    ex); 
-		
+		message_info_array =
+			camel_mbox_parse_file (mbox_file_fd, "From ", 0,
+					       &file_size, &next_uid, TRUE,
+					       NULL, 0, ex); 
 		close (mbox_file_fd);
-		if (camel_exception_get_id (ex)) { 
+		if (camel_exception_get_id (ex))
 			return;
-		}
 
-		
-		next_uid = camel_mbox_write_xev (mbox_folder->folder_file_path, 
-						 message_info_array, &file_size, next_uid, ex);
+		next_uid = camel_mbox_write_xev (mbox_folder->folder_file_path,
+						 message_info_array,
+						 &file_size, next_uid, ex);
 
 		if (camel_exception_get_id (ex)) { 
 			/* ** FIXME : free the preparsed information */
 			return;
 		}
-						
-		mbox_summary_info =
+
+		summ = CAMEL_MBOX_SUMMARY (gtk_object_new (camel_mbox_summary_get_type (), NULL));
+		summ->message_info = 
 			parsed_information_to_mbox_summary (message_info_array);
-		
+		summ->nb_message = summ->message_info->len;
+		summ->next_uid = next_uid;		
+		summ->mbox_file_size = file_size;		
 		/* **FIXME : Free the parsed information structure */
 
-		/* allocate an internal summary object */
-		mbox_folder->internal_summary = g_new (CamelMboxSummary, 1);
-		
-		/* generate the folder md5 signature */
-		md5_get_digest_from_file (mbox_folder->folder_file_path, mbox_folder->internal_summary->md5_digest);
-
-		/* store the number of messages as well as the summary array */
-		mbox_folder->internal_summary->nb_message = mbox_summary_info->len;		
-		mbox_folder->internal_summary->next_uid = next_uid;		
-		mbox_folder->internal_summary->mbox_file_size = file_size;		
-		mbox_folder->internal_summary->message_info = mbox_summary_info;
-		
-	} else {
-		/* every thing seems ok, just read the summary file from disk */
-		mbox_folder->internal_summary = camel_mbox_load_summary (mbox_folder->summary_file_path, ex);
+		folder->summary = CAMEL_FOLDER_SUMMARY (summ);
 	}
-	
-	/* copy the internal summary information to the external 
-	   folder summary used by the display engines */
-	camel_mbox_summary_append_internal_to_external (mbox_folder->internal_summary, folder->summary, 0);
 }
 
 
@@ -303,17 +283,17 @@ static void
 _open (CamelFolder *folder, CamelFolderOpenMode mode, CamelException *ex)
 {
 	CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER (folder);
-	//struct dirent *dir_entry;
-	//struct stat stat_buf;
 
 	/* call parent class */
 	parent_class->open (folder, mode, ex);
 	if (camel_exception_get_id(ex))
 		return;
 
+#if 0
 	/* get (or create) uid list */
-	//if (!(mbox_load_uid_list (mbox_folder) > 0))
-	//	mbox_generate_uid_list (mbox_folder);
+	if (!(mbox_load_uid_list (mbox_folder) > 0))
+		mbox_generate_uid_list (mbox_folder);
+#endif
 	
 	_check_get_or_maybe_generate_summary_file (mbox_folder, ex);
 }
@@ -324,12 +304,12 @@ _close (CamelFolder *folder, gboolean expunge, CamelException *ex)
 {
 	CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER (folder);
 
-
 	/* call parent implementation */
 	parent_class->close (folder, expunge, ex);
-	
-	/* save the folder summary on disc */
-	camel_mbox_save_summary (mbox_folder->internal_summary, mbox_folder->summary_file_path, ex);
+
+	/* save the folder summary on disk */
+	camel_mbox_summary_save (CAMEL_MBOX_SUMMARY (folder->summary),
+				 mbox_folder->summary_file_path, ex);
 }
 
 
@@ -340,8 +320,6 @@ _set_name (CamelFolder *folder, const gchar *name, CamelException *ex)
 {
 	CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER (folder);
 	const gchar *root_dir_path;
-	//gchar *full_name;
-	//const gchar *parent_full_name;
 	
 	CAMEL_LOG_FULL_DEBUG ("Entering CamelMboxFolder::set_name\n");
 
@@ -353,21 +331,19 @@ _set_name (CamelFolder *folder, const gchar *name, CamelException *ex)
 	g_free (mbox_folder->folder_dir_path);
 	g_free (mbox_folder->index_file_path);
 
-	root_dir_path = camel_mbox_store_get_toplevel_dir (CAMEL_MBOX_STORE(folder->parent_store));
-
-	CAMEL_LOG_FULL_DEBUG ("CamelMboxFolder::set_name full_name is %s\n", folder->full_name);
-	CAMEL_LOG_FULL_DEBUG ("CamelMboxFolder::set_name root_dir_path is %s\n", root_dir_path);
-
-	mbox_folder->folder_file_path = g_strdup_printf ("%s/%s", root_dir_path, folder->full_name);
-	mbox_folder->summary_file_path = g_strdup_printf ("%s/%s-ev-summary", root_dir_path, folder->full_name);
-	mbox_folder->folder_dir_path = g_strdup_printf ("%s/%s.sdb", root_dir_path, folder->full_name);
-	mbox_folder->index_file_path = g_strdup_printf ("%s/%s.ibex", root_dir_path, folder->full_name);
-
-	CAMEL_LOG_FULL_DEBUG ("CamelMboxFolder::set_name mbox_folder->folder_file_path is %s\n", 
-			      mbox_folder->folder_file_path);
-	CAMEL_LOG_FULL_DEBUG ("CamelMboxFolder::set_name mbox_folder->folder_dir_path is %s\n", 
-			      mbox_folder->folder_dir_path);
-	CAMEL_LOG_FULL_DEBUG ("Leaving CamelMboxFolder::set_name\n");
+	root_dir_path = camel_mbox_store_get_toplevel_dir (CAMEL_MBOX_STORE (folder->parent_store));
+
+	mbox_folder->folder_file_path =
+		g_strdup_printf ("%s/%s", root_dir_path, folder->full_name);
+	mbox_folder->summary_file_path =
+		g_strdup_printf ("%s/%s-ev-summary", root_dir_path,
+				 folder->full_name);
+	mbox_folder->folder_dir_path =
+		g_strdup_printf ("%s/%s.sdb", root_dir_path,
+				 folder->full_name);
+	mbox_folder->index_file_path =
+		g_strdup_printf ("%s/%s.ibex", root_dir_path,
+				 folder->full_name);
 }
 
 
@@ -387,8 +363,8 @@ _exists (CamelFolder *folder, CamelException *ex)
 
 	CAMEL_LOG_FULL_DEBUG ("Entering CamelMboxFolder::exists\n");
 
-	mbox_folder = CAMEL_MBOX_FOLDER(folder);
-	
+	mbox_folder = CAMEL_MBOX_FOLDER (folder);
+
 	/* check if the mbox file path is determined */
 	if (!mbox_folder->folder_file_path) {
 		camel_exception_set (ex, 
@@ -456,7 +432,8 @@ _exists (CamelFolder *folder, CamelException *ex)
 static gboolean
 _create (CamelFolder *folder, CamelException *ex)
 {
-	CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER(folder);
+	CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER (folder);
+	CamelMboxSummary *summary;
 	const gchar *folder_file_path, *folder_dir_path;
 	mode_t dir_mode = S_IRWXU;
 	gint mkdir_error;
@@ -482,14 +459,17 @@ _create (CamelFolder *folder, CamelException *ex)
 	
 	/* if the folder already exists, simply return */
 	folder_already_exists = camel_folder_exists (folder,ex);
-	if (camel_exception_get_id (ex)) return FALSE;
+	if (camel_exception_get_id (ex))
+		return FALSE;
 
-	if (folder_already_exists) return TRUE;
+	if (folder_already_exists)
+		return TRUE;
 
 
 	/* create the directory for the subfolders */
 	mkdir_error = mkdir (folder_dir_path, dir_mode);
-	if (mkdir_error == -1) goto io_error;
+	if (mkdir_error == -1)
+		goto io_error;
 	
 
 	/* create the mbox file */ 
@@ -497,15 +477,16 @@ _create (CamelFolder *folder, CamelException *ex)
 	creat_fd = open (folder_file_path, 
 			 O_WRONLY | O_CREAT | O_APPEND,
 			 S_IRUSR  | S_IWUSR, 0600); 
-	if (creat_fd == -1) goto io_error;
+	if (creat_fd == -1)
+		goto io_error;
 	close (creat_fd);
 
-	/* create the summary object */	
-	mbox_folder->internal_summary = g_new (CamelMboxSummary, 1);
-	mbox_folder->internal_summary->nb_message = 0;
-	mbox_folder->internal_summary->next_uid = 1;
-	mbox_folder->internal_summary->mbox_file_size = 0;
-	mbox_folder->internal_summary->message_info = g_array_new (FALSE, FALSE, sizeof (CamelMboxSummaryInformation));
+	/* create the summary object */
+	summary = CAMEL_MBOX_SUMMARY (gtk_object_new (camel_mbox_summary_get_type (), NULL));
+	summary->nb_message = 0;
+	summary->next_uid = 1;
+	summary->mbox_file_size = 0;
+	summary->message_info = g_array_new (FALSE, FALSE, sizeof (CamelMboxSummaryInformation));
 
 	return TRUE;
 
@@ -531,15 +512,10 @@ _create (CamelFolder *folder, CamelException *ex)
 
 
 
-
-
-
-
-
 static gboolean
 _delete (CamelFolder *folder, gboolean recurse, CamelException *ex)
 {
-	CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER(folder);
+	CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER (folder);
 	const gchar *folder_file_path, *folder_dir_path;
 	gint rmdir_error = 0;
 	gint unlink_error = 0;
@@ -552,9 +528,11 @@ _delete (CamelFolder *folder, gboolean recurse, CamelException *ex)
 	/* in the case where the folder does not exist, 
 	   return immediatly */
 	folder_already_exists = camel_folder_exists (folder, ex);
-	if (camel_exception_get_id (ex)) return FALSE;
+	if (camel_exception_get_id (ex))
+		return FALSE;
 
-	if (!folder_already_exists) return TRUE;
+	if (!folder_already_exists)
+		return TRUE;
 
 
 	/* call default implementation.
@@ -641,7 +619,7 @@ gboolean
 _delete_messages (CamelFolder *folder, CamelException *ex)
 {
 	
-	CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER(folder);
+	CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER (folder);
 	const gchar *folder_file_path;
 	gboolean folder_already_exists;
 	int creat_fd;
@@ -673,7 +651,8 @@ _delete_messages (CamelFolder *folder, CamelException *ex)
 	creat_fd = open (folder_file_path, 
 			 O_WRONLY | O_TRUNC,
 			 S_IRUSR  | S_IWUSR, 0600); 
-	if (creat_fd == -1) goto io_error;
+	if (creat_fd == -1)
+		goto io_error;
 	close (creat_fd);
 	
 	return TRUE;
@@ -701,25 +680,17 @@ _delete_messages (CamelFolder *folder, CamelException *ex)
 }
 
 
-
-
-
-
-
-
-
 static GList *
 _list_subfolders (CamelFolder *folder, CamelException *ex)
 {
 	GList *subfolder_name_list = NULL;
 
-	CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER(folder);
+	CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER (folder);
 	const gchar *folder_dir_path;
 	gboolean folder_exists;
 
 	struct stat stat_buf;
 	gint stat_error = 0;
-	//GList *file_list;
 	gchar *entry_name;
 	gchar *full_entry_name;
 	gchar *real_folder_name;
@@ -727,9 +698,6 @@ _list_subfolders (CamelFolder *folder, CamelException *ex)
 	DIR *dir_handle;
 	gboolean folder_suffix_found;
 	
-	//gchar *io_error_text;
-	
-
 
 	/* check if the folder object exists */
 	if (!folder) {
@@ -839,14 +807,12 @@ _list_subfolders (CamelFolder *folder, CamelException *ex)
 static gint
 _get_message_count (CamelFolder *folder, CamelException *ex)
 {
-	
-	CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER(folder);
 	gint message_count;
 
 	g_assert (folder);
-	g_assert (mbox_folder->internal_summary);
+	g_assert (folder->summary);
 	
-	message_count = mbox_folder->internal_summary->nb_message;
+	message_count = CAMEL_MBOX_SUMMARY (folder->summary)->nb_message;
 
 	CAMEL_LOG_FULL_DEBUG ("CamelMboxFolder::get_message_count found %d messages\n", message_count);
 	return message_count;
@@ -856,7 +822,8 @@ _get_message_count (CamelFolder *folder, CamelException *ex)
 static void
 _append_message (CamelFolder *folder, CamelMimeMessage *message, CamelException *ex)
 {
-	CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER(folder);
+	CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER (folder);
+	CamelMboxSummary *summary = CAMEL_MBOX_SUMMARY (folder->summary);
 	CamelStream *output_stream;
 	guint32 tmp_file_size;
 	guint32 next_uid;
@@ -868,10 +835,12 @@ _append_message (CamelFolder *folder, CamelMimeMessage *message, CamelException
 
 	CAMEL_LOG_FULL_DEBUG ("Entering CamelMboxFolder::append_message\n");
 
-	tmp_message_filename = g_strdup_printf ("%s.tmp", mbox_folder->folder_file_path);
+	tmp_message_filename = g_strdup_printf ("%s.tmp",
+						mbox_folder->folder_file_path);
 
 	/* write the message itself */
-	output_stream = camel_stream_fs_new_with_name (tmp_message_filename, CAMEL_STREAM_FS_WRITE);
+	output_stream = camel_stream_fs_new_with_name (tmp_message_filename,
+						       CAMEL_STREAM_FS_WRITE);
 	if (output_stream != NULL) {
 		camel_stream_write_string (output_stream, "From - \n");
 		camel_data_wrapper_write_to_stream (CAMEL_DATA_WRAPPER (message), output_stream);
@@ -880,7 +849,7 @@ _append_message (CamelFolder *folder, CamelMimeMessage *message, CamelException
 
 	/* at this point we have saved the message to a
 	   temporary file, now, we have to add the x-evolution 
-	   field and also update the main summary summary */
+	   field and also update the main summary */
 
 	/* 
 	   First : parse the mbox file, but only from the 
@@ -890,7 +859,7 @@ _append_message (CamelFolder *folder, CamelMimeMessage *message, CamelException
 	   This position is still stored in the summary 
 	   for the moment 
 	*/
-	next_uid = mbox_folder->internal_summary->next_uid;
+	next_uid = summary->next_uid;
 	tmp_file_fd = open (tmp_message_filename, O_RDONLY);
 	message_info_array =
 		camel_mbox_parse_file (tmp_file_fd, "From - ", 0,
@@ -901,7 +870,7 @@ _append_message (CamelFolder *folder, CamelMimeMessage *message, CamelException
 
 	/* get the value of the last available UID
 	   as saved in the summary file */
-	next_uid = mbox_folder->internal_summary->next_uid;
+	next_uid = summary->next_uid;
 
 	/* 
 	   OK, this is not very efficient, we should not use the same
@@ -920,20 +889,14 @@ _append_message (CamelFolder *folder, CamelMimeMessage *message, CamelException
 		parsed_information_to_mbox_summary (message_info_array);
 
 	/* store the number of messages as well as the summary array */
-	mbox_folder->internal_summary->nb_message += 1;		
-	mbox_folder->internal_summary->next_uid = next_uid;	
+	summary->nb_message += 1;		
+	summary->next_uid = next_uid;	
 
-	((CamelMboxSummaryInformation *)(mbox_summary_info->data))->position += mbox_folder->internal_summary->mbox_file_size;
-	mbox_folder->internal_summary->mbox_file_size += tmp_file_size;		
-	
-	camel_mbox_summary_append_entries (mbox_folder->internal_summary, mbox_summary_info);
-
-	/* append the new entry of the internal summary to 
-	   the external summary */
-	camel_mbox_summary_append_internal_to_external (mbox_folder->internal_summary, 
-							folder->summary, 
-							mbox_folder->internal_summary->nb_message-1);
+	((CamelMboxSummaryInformation *)(mbox_summary_info->data))->position +=
+		summary->mbox_file_size;
+	summary->mbox_file_size += tmp_file_size;		
 
+	camel_mbox_summary_append_entries (summary, mbox_summary_info);
 	g_array_free (mbox_summary_info, TRUE); 
 	
 
@@ -964,9 +927,6 @@ _append_message (CamelFolder *folder, CamelMimeMessage *message, CamelException
 	/* remove the temporary file */
 	//unlink (tmp_message_filename);
 
-	/* generate the folder md5 signature */
-	md5_get_digest_from_file (mbox_folder->folder_file_path, mbox_folder->internal_summary->md5_digest);
-
 	g_free (tmp_message_filename);
 	CAMEL_LOG_FULL_DEBUG ("Leaving CamelMboxFolder::append_message\n");
 }
@@ -977,7 +937,6 @@ _append_message (CamelFolder *folder, CamelMimeMessage *message, CamelException
 static GList *
 _get_uid_list (CamelFolder *folder, CamelException *ex) 
 {
-	CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER(folder);
 	GArray *message_info_array;
 	CamelMboxSummaryInformation *message_info;
 	GList *uid_list = NULL;
@@ -985,10 +944,10 @@ _get_uid_list (CamelFolder *folder, CamelException *ex)
 
 	CAMEL_LOG_FULL_DEBUG ("Entering CamelMboxFolder::get_uid_list\n");
 	
-	message_info_array = mbox_folder->internal_summary->message_info;
+	message_info_array =
+		CAMEL_MBOX_SUMMARY (folder->summary)->message_info;
 	
 	for (i=0; i<message_info_array->len; i++) {
-		
 		message_info = (CamelMboxSummaryInformation *)(message_info_array->data) + i;
 		uid_list = g_list_prepend (uid_list, g_strdup_printf ("%u", message_info->uid));
 	}
@@ -1009,7 +968,7 @@ static CamelMimeMessage *
 _get_message_by_uid (CamelFolder *folder, const gchar *uid, CamelException *ex)
 {
 	
-	CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER(folder);
+	CamelMboxFolder *mbox_folder = CAMEL_MBOX_FOLDER (folder);
 	GArray *message_info_array;
 	CamelMboxSummaryInformation *message_info = NULL;
 	guint32 searched_uid;
@@ -1021,9 +980,10 @@ _get_message_by_uid (CamelFolder *folder, const gchar *uid, CamelException *ex)
 
 	CAMEL_LOG_FULL_DEBUG ("Entering CamelMboxFolder::get_message_by_uid\n");
 	
-        searched_uid = strtoul(uid, (char **)NULL, 10);
+        searched_uid = strtoul (uid, NULL, 10);
 
-	message_info_array = mbox_folder->internal_summary->message_info;
+	message_info_array =
+		CAMEL_MBOX_SUMMARY (folder->summary)->message_info;
 	i=0;
 	uid_found = FALSE;
 	
diff --git a/camel/providers/mbox/camel-mbox-folder.h b/camel/providers/mbox/camel-mbox-folder.h
index 4caa28fd6a..ba17642144 100644
--- a/camel/providers/mbox/camel-mbox-folder.h
+++ b/camel/providers/mbox/camel-mbox-folder.h
@@ -35,7 +35,6 @@ extern "C" {
 
 #include <gtk/gtk.h>
 #include "camel-folder.h"
-#include "camel-mbox-summary.h"
 
 /*  #include "camel-store.h" */
 
@@ -48,15 +47,11 @@ extern "C" {
 typedef struct {
 	CamelFolder parent_object;
 
-	CamelFolderSummary *external_summary; 
-	/* the external summary is intended to be read by callers */
-	
 	gchar *folder_file_path;   /* contains the messages */
 	gchar *summary_file_path;  /* contains the messages summary */
 	gchar *folder_dir_path;    /* contains the subfolders */
 	gchar *index_file_path;	   /* index of body contents */
 
-	CamelMboxSummary *internal_summary; /* internal summary object */
 	GList  *uid_array;
 
 	int search_id;		/* next search id */
diff --git a/camel/providers/mbox/camel-mbox-search.c b/camel/providers/mbox/camel-mbox-search.c
index 22aa599709..8a55ffee1d 100644
--- a/camel/providers/mbox/camel-mbox-search.c
+++ b/camel/providers/mbox/camel-mbox-search.c
@@ -28,13 +28,13 @@
 
 #include <camel/gmime-utils.h>
 #include <camel/camel-log.h>
-#include "camel/camel-folder-summary.h"
 #include "camel/camel-mime-message.h"
 #include "camel/camel-mime-part.h"
 #include "camel/camel-stream.h"
 #include "camel/camel-stream-fs.h"
 #include "camel/camel.h"
 #include "camel-mbox-folder.h"
+#include "camel-mbox-summary.h"
 
 #include "camel-mbox-search.h"
 #define HAVE_FILTER
@@ -300,7 +300,7 @@ int camel_mbox_folder_search_by_expression(CamelFolder *folder, const char *expr
 	gtk_object_ref((GtkObject *)ctx->summary);
 
 	/* FIXME: the index should be global to the folder */
-	ctx->message_info = camel_folder_summary_get_message_info_list(ctx->summary);
+	ctx->message_info = CAMEL_MBOX_SUMMARY(ctx->summary)->message_info;
 	ctx->message_current = NULL;
 	ctx->index = ibex_open(CAMEL_MBOX_FOLDER(folder)->index_file_path, FALSE);
 	if (!ctx->index) {
diff --git a/camel/providers/mbox/camel-mbox-summary.c b/camel/providers/mbox/camel-mbox-summary.c
index 9216f89e97..fd72206226 100644
--- a/camel/providers/mbox/camel-mbox-summary.c
+++ b/camel/providers/mbox/camel-mbox-summary.c
@@ -28,7 +28,6 @@
 #include "camel-exception.h"
 #include "camel-mbox-folder.h"
 #include "camel-mbox-summary.h"
-#include "camel-folder-summary.h"
 #include "md5-utils.h"
 
 
@@ -41,104 +40,230 @@
 #include <string.h>
 #include <errno.h>
 
+static CamelFolderSummaryClass *parent_class = NULL;
 
+static int count_messages (CamelFolderSummary *summary);
+static int count_subfolders (CamelFolderSummary *summary);
+static GPtrArray *get_subfolder_info (CamelFolderSummary *summary,
+				      int first, int count);
+static GPtrArray *get_message_info (CamelFolderSummary *summary,
+				    int first, int count);
+static void finalize (GtkObject *object);
 
+static void
+camel_mbox_summary_class_init (CamelMboxSummaryClass *camel_mbox_summary_class)
+{
+	GtkObjectClass *gtk_object_class =
+		GTK_OBJECT_CLASS (camel_mbox_summary_class);
+	CamelFolderSummaryClass *camel_folder_summary_class =
+		CAMEL_FOLDER_SUMMARY_CLASS (camel_mbox_summary_class);
 
-/* 
- * The mbox provider uses a summary files, 
- * so that it has an internal and an external
- * summary. The internal summary is a summary
- * containing a lot of information, including
- * infos on how to access mails in the mbox file
- * 
- * On the other hand, the external summary is 
- * an implementation of the structure defined in 
- * the camel-folder-summary file (toplevel camel
- * directory)
- *
- * To sum up, the internal summary is only a
- * subset of the internal summary. 
- */
+	parent_class = gtk_type_class (camel_folder_summary_get_type ());
+
+	/* virtual method override */
+	camel_folder_summary_class->count_messages = count_messages;
+	camel_folder_summary_class->count_subfolders = count_subfolders;
+	camel_folder_summary_class->get_subfolder_info = get_subfolder_info;
+	camel_folder_summary_class->get_message_info = get_message_info;
+
+	gtk_object_class->finalize = finalize;
+}
+
+
+GtkType
+camel_mbox_summary_get_type (void)
+{
+	static GtkType camel_mbox_summary_type = 0;
+
+	if (!camel_mbox_summary_type) {
+		GtkTypeInfo camel_mbox_summary_info =	
+		{
+			"CamelMboxSummary",
+			sizeof (CamelMboxSummary),
+			sizeof (CamelMboxSummaryClass),
+			(GtkClassInitFunc) camel_mbox_summary_class_init,
+			(GtkObjectInitFunc) NULL,
+				/* reserved_1 */ NULL,
+				/* reserved_2 */ NULL,
+			(GtkClassInitFunc) NULL,
+		};
+
+		camel_mbox_summary_type = gtk_type_unique (camel_folder_summary_get_type (), &camel_mbox_summary_info);
+	}
+
+	return camel_mbox_summary_type;
+}
+
+static void
+finalize (GtkObject *object)
+{
+	CamelMboxSummary *summary = CAMEL_MBOX_SUMMARY (object);
+	CamelMboxSummaryInformation *info;
+	int i;
+
+	for (i = 0; i < summary->message_info->len; i++) {
+		info = &(((CamelMboxSummaryInformation *)summary->message_info->data)[i]);
+		g_free (info->headers.subject);
+		g_free (info->headers.sender);
+		g_free (info->headers.to);
+		g_free (info->headers.sent_date);
+		g_free (info->headers.received_date);
+		g_free (info->headers.uid);
+	}
+	g_array_free (summary->message_info, TRUE);		
+
+	GTK_OBJECT_CLASS (parent_class)->finalize (object);
+}	
+
+static int
+count_messages (CamelFolderSummary *summary)
+{
+	return CAMEL_MBOX_SUMMARY (summary)->nb_message;
+}
+
+static int
+count_subfolders (CamelFolderSummary *summary)
+{
+	/* XXX */
+	g_warning ("CamelMboxSummary::count_subfolders not implemented");
+	return 0;
+}
 
+static GPtrArray *
+get_subfolder_info (CamelFolderSummary *summary, int first, int count)
+{
+	/* XXX */
+	g_warning ("CamelMboxSummary::count_subfolders not implemented");
+	return 0;
+}
 
+static GPtrArray *
+get_message_info (CamelFolderSummary *summary, int first, int count)
+{
+	CamelMboxSummary *mbox_summary = CAMEL_MBOX_SUMMARY (summary);
+	CamelMboxSummaryInformation *info;
+	GPtrArray *arr;
+
+	/* XXX bounds check */
+
+	arr = g_ptr_array_new ();
+	for (; count; count--) {
+		info = &((CamelMboxSummaryInformation *)mbox_summary->message_info->data)[first++];
+		g_ptr_array_add (arr, info);
+	}
+
+	return arr;
+}
 
 /**
- * camel_mbox_save_summary:
+ * camel_mbox_summary_save:
  * @summary: 
  * @filename: 
  * @ex: 
  * 
- * save the internal summary into a file 
+ * save the summary into a file 
  **/
 void 
-camel_mbox_save_summary (CamelMboxSummary *summary, const gchar *filename, CamelException *ex)
+camel_mbox_summary_save (CamelMboxSummary *summary, const gchar *filename,
+			 CamelException *ex)
 {
 	CamelMboxSummaryInformation *msg_info;
 	guint cur_msg;
-	guint field_lgth;
+	guint field_length;
 	gint fd;
-	gint write_result;
+	gint write_result; /* XXX use this */
+	guint32 data;
 
 	CAMEL_LOG_FULL_DEBUG ("CamelMboxFolder::save_summary entering \n");
 
-	fd = open (filename, 
-		   O_WRONLY | O_CREAT | O_TRUNC,
-		   S_IRUSR  | S_IWUSR);
+	fd = open (filename, O_WRONLY | O_CREAT | O_TRUNC,
+		   S_IRUSR | S_IWUSR);
 	if (fd == -1) {
-			camel_exception_setv (ex, 
-					     CAMEL_EXCEPTION_FOLDER_INSUFFICIENT_PERMISSION,
-					     "could not create the mbox summary file\n"
-					      "\t%s\n"
-					      "Full error is : %s\n",
-					      filename,
-					      strerror (errno));
-			return;
-		}
-	
-	/* compute and write the mbox file md5 signature */
-	//md5_get_digest_from_file (filename, summary->md5_digest);
-
-	/* write the number of messages  + the md5 signatures 
-	 + next UID + mbox file size */
-	write_result = write (fd, summary, G_STRUCT_OFFSET (CamelMboxSummary, message_info));
-
-	
-	for (cur_msg=0; cur_msg < summary->nb_message; cur_msg++) {
-
-		msg_info = (CamelMboxSummaryInformation *)(summary->message_info->data) + cur_msg;
-
-		/* write message position + message size 
-		   + x-evolution offset + uid + status */
-		write (fd, (gchar *)msg_info, 
-		       sizeof (guint32) + 2 * sizeof (guint) + 
-		       sizeof (guint32) + sizeof (guchar));
-		
-		/* write subject */
-		field_lgth = msg_info->subject ? strlen (msg_info->subject) : 0;
-		write (fd, &field_lgth, sizeof (guint));
-		if (field_lgth)
-			write (fd, msg_info->subject, field_lgth);
-		/* write sender */
-		field_lgth = msg_info->sender ? strlen (msg_info->sender) : 0;
-		write (fd, &field_lgth, sizeof (gint));
-		if (field_lgth)
-			write (fd, msg_info->sender, field_lgth);
-
-		/* write to */
-		field_lgth = msg_info->to ? strlen (msg_info->to) : 0;
-		write (fd, &field_lgth, sizeof (gint));
-		if (field_lgth)
-			write (fd, msg_info->to, field_lgth);
-
-		/* write date */
-		field_lgth = msg_info->date ? strlen (msg_info->date) : 0;
-		write (fd, &field_lgth, sizeof (guint));
-		if (field_lgth)
-			write (fd, msg_info->date, field_lgth);
-
+		camel_exception_setv (ex, CAMEL_EXCEPTION_FOLDER_INSUFFICIENT_PERMISSION,
+				      "could not create the mbox summary "
+				      "file\n\t%s\nFull error is : %s\n",
+				      filename,
+				      strerror (errno));
+		return;
+	}
 
+	/* We write the file out in network byte order, not because
+	 * that makes sense, but because it's easy.
+	 */
+
+	data = htons (CAMEL_MBOX_SUMMARY_VERSION);
+	write (fd, &data, sizeof (data));
+
+	data = htons (summary->nb_message);
+	write (fd, &data, sizeof (data));
+	data = htons (summary->next_uid);
+	write (fd, &data, sizeof (data));
+	data = htons (summary->mbox_file_size);
+	write (fd, &data, sizeof (data));
+	data = htons (summary->mbox_modtime);
+	write (fd, &data, sizeof (data));
+
+	for (cur_msg = 0; cur_msg < summary->nb_message; cur_msg++) {
+		msg_info = (CamelMboxSummaryInformation *)
+			(summary->message_info->data) + cur_msg;
+
+		/* Write meta-info. */
+		data = htons (msg_info->position);
+		write (fd, &data, sizeof (data));
+		data = htons (msg_info->size);
+		write (fd, &data, sizeof (data));
+		data = htons (msg_info->x_evolution_offset);
+		write (fd, &data, sizeof (data));
+		data = htons (msg_info->uid);
+		write (fd, &data, sizeof (data));
+		write (fd, &msg_info->status, 1);
+
+		/* Write subject. */
+		if (msg_info->headers.subject)
+			field_length = htons (strlen (msg_info->headers.subject));
+		else
+			field_length = 0;
+		write (fd, &field_length, sizeof (field_length));
+		if (msg_info->headers.subject)
+			write (fd, msg_info->headers.subject, field_length);
+
+		/* Write sender. */
+		if (msg_info->headers.sender)
+			field_length = htons (strlen (msg_info->headers.sender));
+		else
+			field_length = 0;
+		write (fd, &field_length, sizeof (field_length));
+		if (msg_info->headers.sender)
+			write (fd, msg_info->headers.sender, field_length);
+
+		/* Write to. */
+		if (msg_info->headers.to)
+			field_length = htons (strlen (msg_info->headers.to));
+		else
+			field_length = 0;
+		write (fd, &field_length, sizeof (field_length));
+		if (msg_info->headers.to)
+			write (fd, msg_info->headers.to, field_length);
+
+		/* Write sent date. */
+		if (msg_info->headers.sent_date)
+			field_length = htons (strlen (msg_info->headers.sent_date));
+		else
+			field_length = 0;
+		write (fd, &field_length, sizeof (field_length));
+		if (msg_info->headers.sent_date)
+			write (fd, msg_info->headers.sent_date, field_length);
+
+		/* Write received date. */
+		if (msg_info->headers.received_date)
+			field_length = htons (strlen (msg_info->headers.received_date));
+		else
+			field_length = 0;
+		write (fd, &field_length, sizeof (field_length));
+		if (msg_info->headers.received_date)
+			write (fd, msg_info->headers.received_date, field_length);
 	}
-			
+		
 	close (fd);
 
 	CAMEL_LOG_FULL_DEBUG ("CamelMboxFolder::save_summary leaving \n");
@@ -146,227 +271,152 @@ camel_mbox_save_summary (CamelMboxSummary *summary, const gchar *filename, Camel
 
 
 
-
-
 /**
- * camel_mbox_load_summary:
+ * camel_mbox_summary_load:
  * @filename: 
  * @ex: 
  * 
- * load the internal summary from a file 
+ * load the summary from a file 
  * 
  * Return value: 
  **/
 CamelMboxSummary *
-camel_mbox_load_summary (const gchar *filename, CamelException *ex)
+camel_mbox_summary_load (const gchar *filename, CamelException *ex)
 {
 	CamelMboxSummaryInformation *msg_info;
 	guint cur_msg;
-	guint field_lgth;
+	guint field_length;
 	gint fd;
 	CamelMboxSummary *summary;
 	gint read_result;
+	guint32 data;
 
 	CAMEL_LOG_FULL_DEBUG ("CamelMboxFolder::save_summary entering \n");
 
 	fd = open (filename, O_RDONLY);
 	if (fd == -1) {
-			camel_exception_setv (ex, 
-					     CAMEL_EXCEPTION_FOLDER_INSUFFICIENT_PERMISSION,
-					     "could not open the mbox summary file\n"
-					      "\t%s\n"
-					      "Full error is : %s\n",
-					      filename,
-					      strerror (errno));
-			return NULL;
-		}
-	summary = g_new0 (CamelMboxSummary, 1);
-
-	/* read the message number, the md5 signature 
-	 and the next available UID + mbox file size */
-	read_result = read (fd, summary, G_STRUCT_OFFSET (CamelMboxSummary, message_info));
-
-
-	summary->message_info = g_array_new (FALSE, FALSE, sizeof (CamelMboxSummaryInformation));
-	summary->message_info =  g_array_set_size (summary->message_info, summary->nb_message);
-
-	
-	for (cur_msg=0; cur_msg < summary->nb_message; cur_msg++)  {
-		
-		msg_info = (CamelMboxSummaryInformation *)(summary->message_info->data) + cur_msg;
-		
-		/* read message position  + message size 
-		   + x-evolution offset + uid + status */
-		read (fd, (gchar *)msg_info, 
-		       sizeof (guint32) + 2 * sizeof (guint) + 
-		       sizeof (guint32) + sizeof (guchar));
-		
+		camel_exception_setv (ex, CAMEL_EXCEPTION_FOLDER_INSUFFICIENT_PERMISSION,
+				      "could not open the mbox summary file\n"
+				      "\t%s\nFull error is : %s\n",
+				      filename, strerror (errno));
+		return NULL;
+	}
 
-		/* read the subject */
-		read (fd, &field_lgth, sizeof (gint));
-		if (field_lgth > 0) {			
-			msg_info->subject = g_new0 (gchar, field_lgth + 1);
-			read (fd, msg_info->subject, field_lgth);
+	/* Verify version number. */
+	read (fd, &data, sizeof(data));
+	data = ntohs (data);
+
+	if (data != CAMEL_MBOX_SUMMARY_VERSION) {
+		camel_exception_setv (ex, CAMEL_EXCEPTION_FOLDER_SUMMARY_INVALID,
+				      "This folder summary was written by "
+				      "%s version of this software.",
+				      data < CAMEL_MBOX_SUMMARY_VERSION ?
+				      "an older" : "a newer");
+		return NULL;
+	}
+
+	summary = CAMEL_MBOX_SUMMARY (gtk_object_new (camel_mbox_summary_get_type (), NULL));
+
+	read (fd, &data, sizeof(data));
+	summary->nb_message = ntohs (data);
+	read (fd, &data, sizeof(data));
+	summary->next_uid = ntohs (data);
+	read (fd, &data, sizeof(data));
+	summary->mbox_file_size = ntohs (data);
+	read (fd, &data, sizeof(data));
+	summary->mbox_modtime = ntohs (data);
+
+	summary->message_info =
+		g_array_new (FALSE, FALSE,
+			     sizeof (CamelMboxSummaryInformation));
+	g_array_set_size (summary->message_info, summary->nb_message);
+
+	for (cur_msg = 0; cur_msg < summary->nb_message; cur_msg++)  {
+		msg_info = (CamelMboxSummaryInformation *)
+			(summary->message_info->data) + cur_msg;
+
+		/* Read the meta-info. */
+		read (fd, &data, sizeof(data));
+		msg_info->position = ntohs (data);
+		read (fd, &data, sizeof(data));
+		msg_info->size = ntohs (data);
+		read (fd, &data, sizeof(data));
+		msg_info->x_evolution_offset = ntohs (data);
+		read (fd, &(msg_info->status), 1);
+		read (fd, &data, sizeof(data));
+		msg_info->uid = ntohs (data);
+		msg_info->headers.uid = g_strdup_printf ("%d", msg_info->uid);
+		read (fd, &msg_info->status, 1);
+
+		/* Read the subject. */
+		read (fd, &field_length, sizeof (field_length));
+		field_length = ntohs (field_length);
+		if (field_length > 0) {			
+			msg_info->headers.subject =
+				g_new0 (gchar, field_length + 1);
+			read (fd, msg_info->headers.subject, field_length);
 		} else 
-			msg_info->subject = NULL;
+			msg_info->headers.subject = NULL;
 		
-		/* read the sender */
-		read (fd, &field_lgth, sizeof (gint));
-		if (field_lgth > 0) {			
-			msg_info->sender = g_new0 (gchar, field_lgth + 1);
-			read (fd, msg_info->sender, field_lgth);
+		/* Read the sender. */
+		read (fd, &field_length, sizeof (field_length));
+		field_length = ntohs (field_length);
+		if (field_length > 0) {			
+			msg_info->headers.sender =
+				g_new0 (gchar, field_length + 1);
+			read (fd, msg_info->headers.sender, field_length);
 		} else 
-			msg_info->sender = NULL;
+			msg_info->headers.sender = NULL;
 		
-		/* read the "to" field */
-		read (fd, &field_lgth, sizeof (gint));
-		if (field_lgth > 0) {			
-			msg_info->to = g_new0 (gchar, field_lgth + 1);
-			read (fd, msg_info->to, field_lgth);
+		/* Read the "to" field. */
+		read (fd, &field_length, sizeof (field_length));
+		field_length = ntohs (field_length);
+		if (field_length > 0) {			
+			msg_info->headers.to =
+				g_new0 (gchar, field_length + 1);
+			read (fd, msg_info->headers.to, field_length);
 		} else 
-			msg_info->to = NULL;
-		
-		/* read the "date" field */
-		read (fd, &field_lgth, sizeof (gint));
-		if (field_lgth > 0) {			
-			msg_info->date = g_new0 (gchar, field_lgth + 1);
-			read (fd, msg_info->date, field_lgth);
+			msg_info->headers.to = NULL;
+
+		/* Read the sent date field. */
+		read (fd, &field_length, sizeof (field_length));
+		field_length = ntohs (field_length);
+		if (field_length > 0) {			
+			msg_info->headers.sent_date =
+				g_new0 (gchar, field_length + 1);
+			read (fd, msg_info->headers.sent_date, field_length);
 		} else 
-			msg_info->date = NULL;
-		
-
-		
-		
+			msg_info->headers.sent_date = NULL;
+
+		/* Read the received date field. */
+		read (fd, &field_length, sizeof (field_length));
+		field_length = ntohs (field_length);
+		if (field_length > 0) {			
+			msg_info->headers.received_date =
+				g_new0 (gchar, field_length + 1);
+			read (fd, msg_info->headers.received_date,
+			      field_length);
+		} else 
+			msg_info->headers.received_date = NULL;
 	}		
-	
-	close (fd);
-	return summary;
-}
-
-
-
-
-
-
-
-
-
-/**
- * camel_mbox_check_summary_sync:
- * @summary_filename: 
- * @mbox_filename: 
- * @ex: 
- * 
- * check if the summary file is in sync with the mbox file
- * 
- * Return value: 
- **/
-gboolean
-camel_mbox_check_summary_sync (gchar *summary_filename,
-			       gchar *mbox_filename,
-			       CamelException *ex)
-
-{
-	gint fd;
-	guchar summary_md5[16];
-	guchar real_md5[16];
-
-	
-	CAMEL_LOG_FULL_DEBUG ("CamelMboxFolder::save_summary entering \n");
 
-	fd = open (summary_filename, O_RDONLY);
-	if (fd == -1) {
-			camel_exception_setv (ex, 
-					     CAMEL_EXCEPTION_FOLDER_INSUFFICIENT_PERMISSION,
-					     "could not open the mbox summary file\n"
-					      "\t%s\n"
-					      "Full error is : %s\n",
-					      summary_filename,
-					      strerror (errno));
-			return FALSE;
-		}
-	
-	/* skip the message number field */
-	lseek (fd, sizeof (guint), SEEK_SET);
-	
-	/* read the md5 signature stored in the summary file */
-	read (fd, summary_md5, sizeof (guchar) * 16);
 	close (fd);
-	/* ** FIXME : check for exception in all these operations */
-	
-	/* compute the actual md5 signature on the 
-	   mbox file */
-	md5_get_digest_from_file (mbox_filename, real_md5);
-	
-	return (strncmp (real_md5, summary_md5, 16) == 0);
+	return summary;
 }
 
 
-
-
-
 /**
  * camel_mbox_summary_append_entries:
  * @summary: 
  * @entries: 
  * 
- * append an entry to an internal summary
+ * append an entry to a summary
  **/
 void
 camel_mbox_summary_append_entries (CamelMboxSummary *summary, GArray *entries)
 {
-		
-	summary->message_info = g_array_append_vals (summary->message_info, entries->data, entries->len);
-	
-}
 
-
-
-
-
-/**
- * camel_mbox_summary_append_internal_to_external:
- * @internal: 
- * @external: 
- * @first_entry: first entry to append.
- * 
- * append some entries from the internal summary to 
- * the external one.
- **/
-void 
-camel_mbox_summary_append_internal_to_external (CamelMboxSummary *internal, 
-						CamelFolderSummary *external, 
-						guint first_entry)
-{
-	GArray *internal_array;
-	GArray *external_array;
-	
-	CamelMessageInfo external_entry;
-	CamelMboxSummaryInformation *internal_entry;
-	
-	int i;
-
-	
-	internal_array = internal->message_info;
-	external_array = external->message_info_list;
-	
-	/* we don't set any extra fields */
-	external_entry.extended_fields = NULL;
-
-
-	for (i=first_entry; i<internal_array->len; i++) {
-		internal_entry = (CamelMboxSummaryInformation *)(internal_array->data) + i;
-		
-		external_entry.subject = internal_entry->subject ? strdup (internal_entry->subject) : NULL;
-		external_entry.uid = g_strdup_printf ("%u", internal_entry->uid);
-		external_entry.sent_date = internal_entry->date ? strdup (internal_entry->date) : NULL;
-		external_entry.sender = internal_entry->sender ? strdup (internal_entry->sender) : NULL;
-		external_entry.size = internal_entry->size;
-
-		g_array_append_vals (external_array, &external_entry, 1);
-		
-	}
-	
-	
+	summary->message_info = g_array_append_vals (summary->message_info,
+						     entries->data,
+						     entries->len);
 }
-
diff --git a/camel/providers/mbox/camel-mbox-summary.h b/camel/providers/mbox/camel-mbox-summary.h
index 4ee4770a03..f8570f15c0 100644
--- a/camel/providers/mbox/camel-mbox-summary.h
+++ b/camel/providers/mbox/camel-mbox-summary.h
@@ -25,61 +25,61 @@
 #ifndef MBOX_SUMMARY_H
 #define MBOX_SUMMARY_H 1
 
-#include <glib.h>
+#include <camel-folder-summary.h>
 
+#define CAMEL_MBOX_SUMMARY_TYPE     (camel_mbox_summary_get_type ())
+#define CAMEL_MBOX_SUMMARY(obj)     (GTK_CHECK_CAST((obj), CAMEL_MBOX_SUMMARY_TYPE, CamelMboxSummary))
+#define CAMEL_MBOX_SUMMARY_CLASS(k) (GTK_CHECK_CLASS_CAST ((k), CAMEL_MBOX_SUMMARY_TYPE, CamelMboxSummaryClass))
+#define CAMEL_IS_MBOX_SUMMARY(o)    (GTK_CHECK_TYPE((o), CAMEL_MBOX_SUMMARY_TYPE))
+
+
+#define CAMEL_MBOX_SUMMARY_VERSION 1
 
 
-/* This contains information about one message inside 
- * the mbox file. This is used in the intenal summary */
 typedef struct {
+	CamelMessageInfo headers;
 
 	guint32  position;
 	guint    size;
 	guint    x_evolution_offset;
 	guint32  uid;
 	guchar   status;
-	gchar   *subject;
-	gchar   *sender;
-	gchar   *to;
-	gchar   *date;
-	gchar   *received_date;
 
 } CamelMboxSummaryInformation;
 
 
 /* this contains informations about the whole mbox file */
 typedef struct {
-	
-	guint nb_message;      /* number of messages in the summary    */
-	guchar md5_digest[16];   /* md5 signature of the mbox file     */
+	CamelFolderSummary parent_object;
+
+	guint nb_message;	/* number of messages in the summary	*/
 	guint32 next_uid;
 	guint32 mbox_file_size;
-	
-	GArray *message_info;    /* array of CamelMboxSummaryInformation */
-	
-} CamelMboxSummary;
+	guint32 mbox_modtime;
 
+	GArray *message_info;	/* array of CamelMboxSummaryInformation	*/
 
-void 
-camel_mbox_save_summary (CamelMboxSummary *summary, const gchar *filename, CamelException *ex);
+} CamelMboxSummary;
+
+typedef struct {
+	CamelFolderSummaryClass parent_class;
 
-CamelMboxSummary *
-camel_mbox_load_summary (const gchar *filename, CamelException *ex);
+} CamelMboxSummaryClass;
 
-gboolean
-camel_mbox_check_summary_sync (gchar *summary_filename,
-			       gchar *mbox_filename,
-			       CamelException *ex);
 
-void
-camel_mbox_summary_append_entries (CamelMboxSummary *summary, GArray *entries);
+GtkType camel_mbox_summary_get_type (void);
 
+void camel_mbox_summary_save (CamelMboxSummary *summary,
+			      const gchar *filename, CamelException *ex);
+CamelMboxSummary *camel_mbox_summary_load (const gchar *filename,
+					   CamelException *ex);
 
+gboolean camel_mbox_summary_check_sync (gchar *summary_filename,
+					gchar *mbox_filename,
+					CamelException *ex);
 
-void 
-camel_mbox_summary_append_internal_to_external (CamelMboxSummary *internal, 
-						CamelFolderSummary *external, 
-						guint first_entry);
+void camel_mbox_summary_append_entries (CamelMboxSummary *summary,
+					GArray *entries);
 
 
-#endif /* MH_SUMMARY_H */
+#endif /* MBOX_SUMMARY_H */
diff --git a/camel/providers/mbox/camel-mbox-utils.c b/camel/providers/mbox/camel-mbox-utils.c
index aa2d19a079..1b16941148 100644
--- a/camel/providers/mbox/camel-mbox-utils.c
+++ b/camel/providers/mbox/camel-mbox-utils.c
@@ -57,7 +57,6 @@
 #include <glib.h>
 #include "camel-mbox-utils.h"
 #include "camel-mbox-parser.h"
-#include "camel-folder-summary.h"
 #include "camel-mbox-summary.h"
 
 
@@ -367,19 +366,23 @@ parsed_information_to_mbox_summary (GArray *parsed_information)
 		cur_sum_info->x_evolution_offset = cur_msg_info->x_evolution_offset;
 
 		cur_sum_info->uid = cur_msg_info->uid;
+		cur_sum_info->headers.uid = g_strdup_printf ("%d",
+							     cur_sum_info->uid);
 
 		cur_sum_info->status = cur_msg_info->status;
 
-		cur_sum_info->subject = cur_msg_info->subject;
+		cur_sum_info->headers.subject = cur_msg_info->subject;
 		cur_msg_info->subject = NULL;
 
-		cur_sum_info->sender =  cur_msg_info->from;
+		cur_sum_info->headers.sender =  cur_msg_info->from;
 		cur_msg_info->from = NULL;
 	
-		cur_sum_info->to =  cur_msg_info->to;
+		cur_sum_info->headers.to =  cur_msg_info->to;
 		cur_msg_info->to = NULL;		
 
-		cur_sum_info->date =  cur_msg_info->date;
+		/* XXX I'm guessing one of these is wrong. */
+		cur_sum_info->headers.received_date =  cur_msg_info->date;
+		cur_sum_info->headers.sent_date = g_strdup (cur_msg_info->date);
 		cur_msg_info->date = NULL;		
 		
 	}