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diff --git a/bzrlib/_bencode_pyx.h b/bzrlib/_bencode_pyx.h
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+/* Copyright (C) 2009 Canonical Ltd
+ *
+ * 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
+ */
+
+/* Simple header providing some macro definitions for _bencode_pyx.pyx
+ */
+
+#define D_UPDATE_TAIL(self, n) (((self)->size -= (n), (self)->tail += (n)))
+#define E_UPDATE_TAIL(self, n) (((self)->size += (n), (self)->tail += (n)))