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%% Copyright (c) 2015 Peter Morgan <peter.james.morgan@gmail.com> |
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%% |
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%% Licensed under the Apache License, Version 2.0 (the "License"); |
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%% you may not use this file except in compliance with the License. |
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%% You may obtain a copy of the License at |
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%% |
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%% http://www.apache.org/licenses/LICENSE-2.0 |
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%% |
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%% Unless required by applicable law or agreed to in writing, software |
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%% distributed under the License is distributed on an "AS IS" BASIS, |
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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%% See the License for the specific language governing permissions and |
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%% limitations under the License. |
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-module(pcapng_name_resolution_block). |
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-export([parse/2]). |
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-define(NRES_IP4RECORD, 1). |
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-define(NRES_IP6RECORD, 2). |
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-spec parse(binary(), fun((binary()) -> integer())) -> map(). |
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parse(Data, I) -> |
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records(Data, I). |
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records(Data, I) -> |
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records(Data, I, #{}). |
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records(<<0:16, 0:16, Options/binary>>, I, Records) -> |
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#{type => name_resolution_block, |
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records => Records, |
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options => pcapng_options:parse(Options, I)}; |
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records(<<Type:16/bits, Length:16/bits, Data/binary>>, I, Records) -> |
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case {I(Type), pcapng:variable_length(Data, I(Length))} of |
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{?NRES_IP4RECORD, |
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#{body := <<A1:8, A2:8, A3:8, A4:8, Names/binary>>, |
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remainder := Remainder}} -> |
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records(Remainder, I, maps:put({A1, A2, A3, A4}, split(Names), |
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Records)); |
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{?NRES_IP6RECORD, |
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#{body := <<IP:16/bytes, Names/binary>>, remainder := Remainder}} -> |
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records(Remainder, I, maps:put(IP, split(Names), Records)) |
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end. |
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split(Names) -> |
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lists:droplast(binary:split(Names, <<0:8>>, [global])). |