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118 lines
3.6 KiB
118 lines
3.6 KiB
//
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// Copyright © 2020 Thomas A. Early, N7TAE
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//
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// ----------------------------------------------------------------------------
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//
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// m17ref is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// m17ref is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// with this software. If not, see <http://www.gnu.org/licenses/>.
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// ----------------------------------------------------------------------------
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#pragma once
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#include <cstdint>
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#include <string.h>
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#include <memory>
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#include "Callsign.h"
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////////////////////////////////////////////////////////////////////////////////////////
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// aliases
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// M17 Packets
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//all structures must be big endian on the wire, so you'll want htonl (man byteorder 3) and such.
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using SM17LichLegacy = struct __attribute__((__packed__)) lich_tag {
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uint8_t addr_dst[6];
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uint8_t addr_src[6];
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uint16_t frametype; //frametype flag field per the M17 spec
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uint8_t nonce[14]; //bytes for the nonce
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}; // 6 + 6 + 2 + 14 = 28 bytes
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// Standard LICH includes CRC
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using SM17LichStandard = struct __attribute__((__packed__)) lich_std_tag {
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uint8_t addr_dst[6];
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uint8_t addr_src[6];
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uint16_t frametype;
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uint8_t nonce[14];
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uint16_t crc;
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}; // 6 + 6 + 2 + 14 + 2 = 30 bytes
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//without SYNC or other parts
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using SM17FrameLegacy = struct __attribute__((__packed__)) m17_tag {
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uint8_t magic[4];
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uint16_t streamid;
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SM17LichLegacy lich;
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uint16_t framenumber;
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uint8_t payload[16];
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uint16_t crc; //16 bit CRC
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}; // 4 + 2 + 28 + 2 + 16 + 2 = 54 bytes
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using SM17FrameStandard = struct __attribute__((__packed__)) m17_std_tag {
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uint8_t magic[4];
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uint16_t streamid;
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SM17LichStandard lich;
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uint16_t framenumber;
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uint8_t payload[16];
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uint16_t crc; //16 bit CRC
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}; // 4 + 2 + 30 + 2 + 16 + 2 = 56 bytes
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using SLinkPacket = struct __attribute__((__packed__)) link_tag {
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uint8_t magic[4];
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uint8_t fromcs[6];
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uint8_t mod;
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}; // 37 bytes
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class CM17Packet
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{
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public:
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CM17Packet() {}
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CM17Packet(const uint8_t *buf, bool isStandard = false);
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const CCallsign &GetDestCallsign() const;
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const CCallsign &GetSourceCallsign() const;
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char GetDestModule() const;
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uint16_t GetFrameNumber() const;
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uint16_t GetFrameType() const;
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const uint8_t *GetPayload() const;
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const uint8_t *GetNonce() const;
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void SetPayload(const uint8_t *newpayload);
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uint16_t GetStreamId() const;
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uint16_t GetCRC() const;
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void SetCRC(uint16_t crc);
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void SetDestCallsign(const CCallsign &cs);
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void SetSourceCallsign(const CCallsign &cs);
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void SetStreamId(uint16_t id);
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void SetFrameNumber(uint16_t fn);
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void SetFrameType(uint16_t ft);
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void SetNonce(const uint8_t *nonce);
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void SetMagic();
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uint8_t *GetLICHPointer() { return m_isStandard ? (uint8_t*)&m_frame.standard.lich : (uint8_t*)&m_frame.legacy.lich; }
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size_t GetLICHSize() const { return m_isStandard ? sizeof(SM17LichStandard) : sizeof(SM17LichLegacy); }
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const uint8_t *GetBuffer() const { return m_frame.buffer; }
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size_t GetSize() const { return m_isStandard ? sizeof(SM17FrameStandard) : sizeof(SM17FrameLegacy); }
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bool IsLastPacket() const;
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private:
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CCallsign destination, source;
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// Flexible storage for either Legacy or Standard frame
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union {
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SM17FrameLegacy legacy;
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SM17FrameStandard standard;
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uint8_t buffer[60];
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} m_frame;
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bool m_isStandard;
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};
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