MMDVMHost-Private/DMRCSBK.cpp

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/*
* Copyright (C) 2015,2016,2020,2021 by Jonathan Naylor G4KLX
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* Copyright (C) 2019 by Patrick Maier DK5MP
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*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
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#include "DMRCSBK.h"
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#include "BPTC19696.h"
#include "Utils.h"
#include "CRC.h"
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#include <cstdio>
#include <cassert>
CDMRCSBK::CDMRCSBK() :
m_data(NULL),
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m_CSBKO(CSBKO_NONE),
m_FID(0x00U),
m_GI(false),
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m_bsId(0U),
m_srcId(0U),
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m_dstId(0U),
m_dataContent(false),
m_CBF(0U)
{
m_data = new unsigned char[12U];
}
CDMRCSBK::~CDMRCSBK()
{
delete[] m_data;
}
bool CDMRCSBK::put(const unsigned char* bytes)
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{
assert(bytes != NULL);
CBPTC19696 bptc;
bptc.decode(bytes, m_data);
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m_data[10U] ^= CSBK_CRC_MASK[0U];
m_data[11U] ^= CSBK_CRC_MASK[1U];
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bool valid = CCRC::checkCCITT162(m_data, 12U);
if (!valid)
return false;
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// Restore the checksum
m_data[10U] ^= CSBK_CRC_MASK[0U];
m_data[11U] ^= CSBK_CRC_MASK[1U];
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m_CSBKO = CSBKO(m_data[0U] & 0x3FU);
m_FID = m_data[1U];
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switch (m_CSBKO) {
case CSBKO_BSDWNACT:
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m_GI = false;
m_bsId = m_data[4U] << 16 | m_data[5U] << 8 | m_data[6U];
m_srcId = m_data[7U] << 16 | m_data[8U] << 8 | m_data[9U];
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m_dataContent = false;
m_CBF = 0U;
CUtils::dump(1U, "Downlink Activate CSBK", m_data, 12U);
break;
case CSBKO_UUVREQ:
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m_GI = false;
m_dstId = m_data[4U] << 16 | m_data[5U] << 8 | m_data[6U];
m_srcId = m_data[7U] << 16 | m_data[8U] << 8 | m_data[9U];
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m_dataContent = false;
m_CBF = 0U;
CUtils::dump(1U, "Unit to Unit Service Request CSBK", m_data, 12U);
break;
case CSBKO_UUANSRSP:
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m_GI = false;
m_dstId = m_data[4U] << 16 | m_data[5U] << 8 | m_data[6U];
m_srcId = m_data[7U] << 16 | m_data[8U] << 8 | m_data[9U];
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m_dataContent = false;
m_CBF = 0U;
CUtils::dump(1U, "Unit to Unit Service Answer Response CSBK", m_data, 12U);
break;
case CSBKO_PRECCSBK:
m_GI = (m_data[2U] & 0x40U) == 0x40U;
m_dstId = m_data[4U] << 16 | m_data[5U] << 8 | m_data[6U];
m_srcId = m_data[7U] << 16 | m_data[8U] << 8 | m_data[9U];
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m_dataContent = (m_data[2U] & 0x80U) == 0x80U;
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m_CBF = m_data[3U];
CUtils::dump(1U, "Preamble CSBK", m_data, 12U);
break;
case CSBKO_NACKRSP:
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m_GI = false;
m_srcId = m_data[4U] << 16 | m_data[5U] << 8 | m_data[6U];
m_dstId = m_data[7U] << 16 | m_data[8U] << 8 | m_data[9U];
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m_dataContent = false;
m_CBF = 0U;
CUtils::dump(1U, "Negative Acknowledge Response CSBK", m_data, 12U);
break;
case CSBKO_CALL_ALERT:
m_GI = false;
m_dstId = m_data[4U] << 16 | m_data[5U] << 8 | m_data[6U];
m_srcId = m_data[7U] << 16 | m_data[8U] << 8 | m_data[9U];
m_dataContent = false;
m_CBF = 0U;
CUtils::dump(1U, "Call Alert CSBK", m_data, 12U);
break;
case CSBKO_CALL_ALERT_ACK:
m_GI = false;
m_dstId = m_data[4U] << 16 | m_data[5U] << 8 | m_data[6U];
m_srcId = m_data[7U] << 16 | m_data[8U] << 8 | m_data[9U];
m_dataContent = false;
m_CBF = 0U;
CUtils::dump(1U, "Call Alert Ack CSBK", m_data, 12U);
break;
default:
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m_GI = false;
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m_srcId = 0U;
m_dstId = 0U;
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m_dataContent = false;
m_CBF = 0U;
CUtils::dump("Unhandled CSBK type", m_data, 12U);
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return true;
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}
return true;
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}
void CDMRCSBK::get(unsigned char* bytes) const
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{
assert(bytes != NULL);
m_data[10U] ^= CSBK_CRC_MASK[0U];
m_data[11U] ^= CSBK_CRC_MASK[1U];
CCRC::addCCITT162(m_data, 12U);
m_data[10U] ^= CSBK_CRC_MASK[0U];
m_data[11U] ^= CSBK_CRC_MASK[1U];
CBPTC19696 bptc;
bptc.encode(m_data, bytes);
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}
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CSBKO CDMRCSBK::getCSBKO() const
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{
return m_CSBKO;
}
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unsigned char CDMRCSBK::getFID() const
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{
return m_FID;
}
bool CDMRCSBK::getOVCM() const
{
bool bOVCM = false;
// Service options informations are only available in
// "Unit to Unit Voice Service Request CSBK" and
// "Unit to Unit Voice Service Answer Response CSBK"
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if ((m_CSBKO == CSBKO_UUVREQ) || (m_CSBKO == CSBKO_UUANSRSP))
bOVCM = (m_data[2U] & 0x04U) == 0x04U;
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return bOVCM;
}
void CDMRCSBK::setOVCM(bool ovcm)
{
// Set OVCM only in CSBKs having the service options information
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if ((m_CSBKO == CSBKO_UUVREQ) || (m_CSBKO == CSBKO_UUANSRSP)) {
if (ovcm)
m_data[2U] |= 0x04U;
}
}
void CDMRCSBK::clearOVCM()
{
if (getOVCM())
m_data[2U] ^= 0x04U;
}
bool CDMRCSBK::getGI() const
{
return m_GI;
}
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unsigned int CDMRCSBK::getBSId() const
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{
return m_bsId;
}
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unsigned int CDMRCSBK::getSrcId() const
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{
return m_srcId;
}
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unsigned int CDMRCSBK::getDstId() const
{
return m_dstId;
}
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bool CDMRCSBK::getDataContent() const
{
return m_dataContent;
}
unsigned char CDMRCSBK::getCBF() const
{
return m_CBF;
}
void CDMRCSBK::setCBF(unsigned char cbf)
{
m_CBF = m_data[3U] = cbf;
}