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100 lines
3.4 KiB
100 lines
3.4 KiB
/**
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* Digital Voice Modem - Host Software
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* GPLv2 Open Source. Use is subject to license terms.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* @package DVM / Host Software
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*
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*/
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/*
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* Copyright (C) 2022 by Bryan Biedenkapp N2PLL
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "Defines.h"
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#include "p25/lc/tdulc/LC_GROUP.h"
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#include "Log.h"
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#include "Utils.h"
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using namespace p25::lc::tdulc;
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using namespace p25::lc;
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using namespace p25;
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#include <cassert>
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#include <cmath>
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// ---------------------------------------------------------------------------
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// Public Class Members
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// ---------------------------------------------------------------------------
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/// <summary>
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/// Initializes a new instance of the LC_GROUP class.
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/// </summary>
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LC_GROUP::LC_GROUP() : TDULC()
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{
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m_lco = p25::LC_GROUP;
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}
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/// <summary>
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/// Decode a terminator data unit w/ link control.
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/// </summary>
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/// <param name="data"></param>
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/// <returns>True, if TDULC was decoded, otherwise false.</returns>
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bool LC_GROUP::decode(const uint8_t* data)
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{
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assert(data != NULL);
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uint8_t rs[P25_TDULC_LENGTH_BYTES + 1U];
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::memset(rs, 0x00U, P25_TDULC_LENGTH_BYTES);
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bool ret = TDULC::decode(data, rs);
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if (!ret)
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return false;
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ulong64_t rsValue = TDULC::toValue(rs);
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m_mfId = rs[1U]; // Mfg Id.
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m_group = true;
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m_emergency = (rs[2U] & 0x80U) == 0x80U; // Emergency Flag
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m_encrypted = (rs[2U] & 0x40U) == 0x40U; // Encryption Flag
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m_priority = (rs[2U] & 0x07U); // Priority
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m_dstId = (uint32_t)((rsValue >> 24) & 0xFFFFU); // Talkgroup Address
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m_srcId = (uint32_t)(rsValue & 0xFFFFFFU); // Source Radio Address
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return true;
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}
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/// <summary>
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/// Encode a terminator data unit w/ link control.
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/// </summary>
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/// <param name="data"></param>
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void LC_GROUP::encode(uint8_t* data)
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{
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assert(data != NULL);
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ulong64_t rsValue = 0U;
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rsValue = m_mfId;
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rsValue = (rsValue << 8) +
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(m_emergency ? 0x80U : 0x00U) + // Emergency Flag
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(m_encrypted ? 0x40U : 0x00U) + // Encrypted Flag
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(m_priority & 0x07U); // Priority
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rsValue = (rsValue << 24) + m_dstId; // Talkgroup Address
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rsValue = (rsValue << 24) + m_srcId; // Source Radio Address
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std::unique_ptr<uint8_t[]> rs = TDULC::fromValue(rsValue);
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TDULC::encode(data, rs.get());
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}
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