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MTP3: fix encoding of bit/byte ordering in routing label

This commit is contained in:
Harald Welte 2012-01-16 21:39:48 +01:00
parent 429456f13f
commit 092443629b
1 changed files with 7 additions and 2 deletions
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9
src/mtp3_codec.erl
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@ -28,7 +28,10 @@
% Parse standard routing label according to Section 2.2 of ITU-T Q.704
parse_mtp3_routing_label(_, LabelBin) when is_binary(LabelBin) ->
<<Sls:4/big, Opc:14/big, Dpc:14/big, Remain/binary>> = LabelBin,
% we need to swap the four bytes and then parse the fields
<<Label32:32/little, Remain/binary>> = LabelBin,
LabelRev = <<Label32:32/big>>,
<<Sls:4/big, Dpc:14/big, Opc:14/big>> = LabelRev,
{ok, #mtp3_routing_label{sig_link_sel = Sls, origin_pc = Opc, dest_pc = Dpc}, Remain}.
parse_mtp3_msg(DataBin) when is_binary(DataBin) ->
@ -43,7 +46,9 @@ encode_mtp3_routing_label(#mtp3_routing_label{sig_link_sel = Sls, origin_pc = Op
dest_pc = DpcIn}) ->
Opc = osmo_util:pointcode2int(OpcIn),
Dpc = osmo_util:pointcode2int(DpcIn),
<<Sls:4/big, Opc:14/big, Dpc:14/big>>.
% we need to swap the four bytes after encoding the fields
<<Label32:32/little>> = <<Sls:4/big, Dpc:14/big, Opc:14/big>>,
<<Label32:32/big>>.
encode_mtp3_msg(#mtp3_msg{network_ind = NetInd, service_ind = ServiceInd,
routing_label = RoutLbl, payload = Payload}) ->