From bc87eb33f3878051b1d757710b4aa58136169c3a Mon Sep 17 00:00:00 2001
From: Anders Svensson <anders@erlang.org>
Date: Fri, 5 Oct 2012 11:13:11 +0200
Subject: Implement sequence masks

Code should be loaded in this order:

  diameter_session   (sequence/1)
  diameter_peer_fsm  (calls to sequence/1)
  diameter_service   (sequence config, mask in receive_message/3)
  diameter_watchdog  (mask in peer start and receive_message/3)
  diameter_config    (accept sequence config)

Order of diameter and diameter_peer doesn't matter.
---
 lib/diameter/src/base/diameter_session.erl | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

(limited to 'lib/diameter/src/base/diameter_session.erl')

diff --git a/lib/diameter/src/base/diameter_session.erl b/lib/diameter/src/base/diameter_session.erl
index 4c468f207c..3b236f109a 100644
--- a/lib/diameter/src/base/diameter_session.erl
+++ b/lib/diameter/src/base/diameter_session.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2010-2011. All Rights Reserved.
+%% Copyright Ericsson AB 2010-2012. All Rights Reserved.
 %%
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -20,6 +20,7 @@
 -module(diameter_session).
 
 -export([sequence/0,
+         sequence/1,
          session_id/1,
          origin_state_id/0]).
 
@@ -30,7 +31,7 @@
 -define(INT32, 16#FFFFFFFF).
 
 %% ---------------------------------------------------------------------------
-%% # sequence/0
+%% # sequence/0-1
 %%
 %% Output: 32-bit
 %% ---------------------------------------------------------------------------
@@ -77,6 +78,15 @@ sequence() ->
     Instr = {_Pos = 2, _Incr = 1, _Threshold = ?INT32, _SetVal = 0},
     ets:update_counter(diameter_sequence, sequence, Instr).
 
+-spec sequence(diameter:sequence())
+   -> diameter:'Unsigned32'().
+
+sequence({_,32}) ->
+    sequence();
+
+sequence({H,N}) ->
+    (H bsl N) bor (sequence() band (1 bsl N - 1)).
+
 %% ---------------------------------------------------------------------------
 %% # origin_state_id/0
 %% ---------------------------------------------------------------------------
-- 
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