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%% Copyright (c) 2023 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(msmp_codec). |
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-feature(maybe_expr, enable). |
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-export([decode/1]). |
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-export([encode/1]). |
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-include_lib("kernel/include/logger.hrl"). |
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decode(Parser) -> |
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fun |
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(Input) -> |
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(scran_result:into_map( |
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scran_combinator:map_parser( |
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scran_bytes:length_encoded( |
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scran_combinator:map_result( |
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msmp_integer_fixed:decode(3), |
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fun |
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(Length) -> |
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%% adjust length to include the sequence number |
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Length + 1 |
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end)), |
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scran_sequence:sequence( |
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[scran_result:kv(sequence, msmp_integer_fixed:decode(1)), |
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scran_result:kv(packet, Parser)]))))(Input) |
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end. |
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encode(Parser) -> |
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fun |
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(Decoded) -> |
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?LOG_DEBUG(#{decoded => Decoded}), |
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(narcs_combinator:map_result( |
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narcs_sequence:sequence( |
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[narcs_combinator:v( |
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sequence, |
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msmp_integer_fixed:encode(1)), |
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narcs_combinator:v( |
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packet, |
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Parser)]), |
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narcs_bytes:length_encoded( |
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fun |
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(Length) -> |
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%% adjust length to exclude the sequence number |
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(msmp_integer_fixed:encode(3))(Length - 1) |
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end)))(Decoded) |
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end. |