From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001
From: Erlang/OTP <otp@erlang.org>
Date: Fri, 20 Nov 2009 14:54:40 +0000
Subject: The R13B03 release.

---
 lib/snmp/src/misc/snmp_mini_mib.erl | 151 ++++++++++++++++++++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100644 lib/snmp/src/misc/snmp_mini_mib.erl

(limited to 'lib/snmp/src/misc/snmp_mini_mib.erl')

diff --git a/lib/snmp/src/misc/snmp_mini_mib.erl b/lib/snmp/src/misc/snmp_mini_mib.erl
new file mode 100644
index 0000000000..d80270d5c2
--- /dev/null
+++ b/lib/snmp/src/misc/snmp_mini_mib.erl
@@ -0,0 +1,151 @@
+%% 
+%% %CopyrightBegin%
+%% 
+%% Copyright Ericsson AB 2006-2009. 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
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%% 
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%% 
+%% %CopyrightEnd%
+%% 
+
+-module(snmp_mini_mib).
+
+%% need definition of mib record
+-include("snmp_types.hrl").
+
+-export([
+	 create/1, 
+	 delete/1,
+	 aliasname/2,	
+	 oid/2, 
+	 type/2
+	]).
+
+
+-record(mini_mib, {cache, db = []}).
+
+
+%%%--------------------------------------------------
+%%% The Mini MIB representation
+%%%--------------------------------------------------
+
+%% Returns a Mini MIB
+create(Mibs) ->
+    Loaded = lists:append([load_mib(Mib) || Mib <- Mibs]),
+    Sorted = lists:keysort(1, Loaded),
+    Db     = remove_dubbletts(Sorted), 
+    Cache  = ets:new(snmp_mini_mib_cache, [set, {keypos, 1}]),
+    #mini_mib{cache = Cache, 
+	      db    = Db}.
+
+delete(#mini_mib{cache = Cache}) ->
+    ets:delete(Cache),
+    ok.
+
+
+%%----------------------------------------------------------------------
+%% Returns: A list of {Oid, Aliasname, Type}
+%%----------------------------------------------------------------------
+load_mib(MIB) ->
+    F1 = snmp_misc:strip_extension_from_filename(MIB, ".bin"),
+    ActualFileName = lists:append(F1, ".bin"),
+    case snmp_misc:read_mib(ActualFileName) of
+	{ok, #mib{mes = MEs, traps = Traps}} -> 
+	    make_mini_mib_elem(MEs++Traps);
+	{error, Reason} -> 
+	    exit({error, {MIB, Reason}})
+    end.
+
+
+%%----------------------------------------------------------------------
+%% Pre: List is sorted (dublettes are list neighbours)
+%%----------------------------------------------------------------------
+remove_dubbletts([])      -> [];
+remove_dubbletts([X])     -> [X];
+remove_dubbletts([X,X|T]) -> remove_dubbletts([X|T]);
+remove_dubbletts([X|T])   -> [X|remove_dubbletts(T)].
+
+
+%%----------------------------------------------------------------------
+%% Args: A list if Mes
+%% Returns: a list of {Oid, Aliasname, Type}
+%%----------------------------------------------------------------------
+make_mini_mib_elem([]) -> [];
+make_mini_mib_elem([#me{aliasname = N, 
+			oid       = Oid, 
+			entrytype = variable,
+			asn1_type = #asn1_type{bertype = Type}} | T]) ->
+    [{Oid, N, Type} | make_mini_mib_elem(T)];
+make_mini_mib_elem([#me{aliasname = N, 
+			oid       = Oid, 
+			entrytype = table_column,
+			asn1_type = ASN1}|T]) 
+  when is_record(ASN1, asn1_type)->
+    [{Oid, N, ASN1#asn1_type.bertype} | make_mini_mib_elem(T)];
+make_mini_mib_elem([#me{aliasname = N, 
+			oid       = Oid,
+			asn1_type = undefined}|T]) ->
+    [{Oid, N, undefined} | make_mini_mib_elem(T)];
+make_mini_mib_elem([#notification{trapname = N, 
+				  oid      = Oid}|T]) ->
+    [{Oid, N, undefined} | make_mini_mib_elem(T)];
+make_mini_mib_elem([_|T]) ->
+    make_mini_mib_elem(T).
+
+
+%%----------------------------------------------------------------------
+%% Returns: false | {Oid, Aliasname, Type}
+%%----------------------------------------------------------------------
+
+aliasname(#mini_mib{cache = Cache, db = Db}, Oid) ->
+    Key = {Oid, aliasname}, 
+    case ets:lookup(Cache, Key) of
+	[{_, Value}] ->
+	    Value;
+	_ ->
+	    Value = aliasname(Db, Oid, false),
+	    ets:insert(Cache, {Key, Value}),
+	    Value
+    end.
+
+aliasname([], _Oid, Res) -> 
+    Res;
+aliasname([{Oid, _Aliasname, _Type} = OidData|T], OidX, Res) 
+  when Oid =< OidX ->
+    case lists:prefix(Oid, OidX) of
+	true ->
+	    aliasname(T, OidX, OidData);
+	false ->
+	    aliasname(T, OidX, Res)
+    end;
+aliasname([{_Oid, _Aliasname, _Type}|_T], _OidX, Res) ->
+    Res.
+
+
+oid(#mini_mib{db = Db}, AliasName) ->
+    case lists:keysearch(AliasName, 2, Db) of
+	{value, {Oid, _Aliasname, _Type}} -> 
+	    Oid;
+	false -> 
+	    false
+    end.
+
+	    
+type(MiniMIB, Oid) ->
+    case aliasname(MiniMIB, Oid) of
+	{_Oid, _AliasName, Type} ->
+	    Type;
+	Else ->
+	    Else
+    end.
+
+
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