* add mu-msg-data.[ch], which is useful when one needs to cache message data

(ie., iterators are good for printing to screen, but mu-msg-data is for
   msg data that should be kept in-memory)

src/mu-msg-data.c

@@ -0,0 +1,69 @@
+/*
+** Copyright (C) 2011 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
+**
+** 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 3, 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+**
+*/
+
+#include "mu-msg-data.h"
+
+MuMsgData*
+mu_msg_data_new (void)
+{
+	/* TODO: check if this is much slower than g_slice_new */
+	return g_slice_new0 (MuMsgData);
+}
+
+MuMsgData*
+mu_msg_data_copy (MuMsgData *mdata)
+{
+	MuMsgData *copy;
+	
+	if (!mdata)
+		return NULL;
+	
+	copy = mu_msg_data_new ();
+
+	/* shallow copy */
+	memcpy (copy, mdata, sizeof(MuMsgData));
+
+	/* now, deep copy ptr data */
+	copy->cc      = g_strdup (mdata->cc);
+	copy->from    = g_strdup (mdata->from);
+	copy->maildir = g_strdup (mdata->maildir);
+	copy->msgid   = g_strdup (mdata->msgid);
+	copy->path    = g_strdup (mdata->path);
+	copy->subject = g_strdup (mdata->subject);
+	copy->to      = g_strdup (mdata->to);
+
+	return copy;
+}
+
+void
+mu_msg_data_destroy (MuMsgData *mdata)
+{
+	if (!mdata)
+		return;
+
+	g_free (mdata->cc);
+	g_free (mdata->from);
+	g_free (mdata->maildir);
+	g_free (mdata->msgid);
+	g_free (mdata->path);
+	g_free (mdata->subject);
+	g_free (mdata->to);
+
+	g_slice_free (MuMsgData, mdata);
+}