63 lines
2.0 KiB
C++
63 lines
2.0 KiB
C++
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/*
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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 "rlp-udp.h"
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#include <cstring>
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namespace ACN {
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namespace RLP {
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namespace UDP {
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preamble_t::preamble_t(PDU::Stream stream) {
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length = stream->read16();
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postamble_size = stream->read16();
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stream->read(acn_id, 12);
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if (stream->gcount() != 12)
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stream->setstate(stream->rdstate() | std::ios_base::failbit);
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}
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/*
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Validate compliance with ACN EPI 17: ACN Root Layer Protocol on UDP
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4.2. Reception
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*/
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preamble_t::operator bool () {
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// 2. Preamble Format: 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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if (length < PREAMBLE_MINIMUM_SIZE)
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return false;
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// 2. Preamble Format: The ACN Packet Identifier shall be the text string
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// “ASC-E1.17\0\0\0” encoded in [ASCII].
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if (memcmp(acn_id, ACN_PACKET_IDENTIFIER, 12))
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return false;
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return true;
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}
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} // UDP
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} // RLP
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} // ACN
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