103 lines
2.9 KiB
C++
103 lines
2.9 KiB
C++
/*
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rlp/udp.cpp
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Copyright (c) 2020 Kevin Matz (kevin.matz@gmail.com)
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#include "udp.h"
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#include <cstring>
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namespace ACN::RLP::UDP {
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/**
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* @brief preamble::preamble
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* @param filled
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*/
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transport::transport(bool filled)
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: RLP::message_transport()
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{
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if (!filled)
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return;
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length = sizeof(length) + sizeof(postamble_size) + sizeof(acn_id);
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postamble_size = 0; //!< 3. The postamble field shall be empty.
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memcpy(acn_id, ACN_PACKET_IDENTIFIER, sizeof(acn_id));
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}
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/**
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* @brief preamble_t::iStream
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* @param stream
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*/
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void transport::iStream(PDU::Stream stream)
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{
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if (!stream->good())
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return;
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/**
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* 2. Preamble Format:
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* The preamble size includes both size fields so the
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* minimum value for preamble size is 16 (octets).
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*/
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*stream >> length;
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if (length < PREAMBLE_MINIMUM_SIZE)
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return stream->setstate(std::ios_base::failbit);
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*stream >> postamble_size;
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/**
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* 2. Preamble Format:
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* The ACN Packet Identifier shall be the text string “ASC-E1.17\0\0\0”
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* encoded in [ASCII].
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*/
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stream->read(acn_id, sizeof(acn_id));
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if (stream->gcount() != sizeof(acn_id))
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return stream->setstate(std::ios_base::failbit);
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if (memcmp(acn_id, ACN_PACKET_IDENTIFIER, sizeof(acn_id))) // memcmp returns 0 if matched
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return stream->setstate(std::ios_base::failbit);
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/**
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* Implementations shall compute the size and position of the PDU block from
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* the preamble size and postamble size provided. ... ignoring any extra
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* octets in the preamble or postamble.
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*/
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if (length > PREAMBLE_MINIMUM_SIZE)
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stream->ignore((length - PREAMBLE_MINIMUM_SIZE));
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RLP::message_transport::iStream(stream);
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}
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/**
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* @brief preamble_t::oStream
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* @param stream
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*/
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void transport::oStream(PDU::Stream stream) const
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{
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*stream << length;
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*stream << postamble_size;
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stream->write(acn_id, sizeof(acn_id));
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RLP::message_transport::oStream(stream);
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}
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} // ACN::RLP::UDP
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