2016-01-26 18:06:31 +00:00
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/*
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* Copyright (C) 2012 by Ian Wraith
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* Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
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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 "DMRDataHeader.h"
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#include "DMRDefines.h"
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2016-02-22 18:12:24 +00:00
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#include "BPTC19696.h"
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2016-02-28 18:22:17 +00:00
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#include "RS129.h"
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2016-02-22 18:12:24 +00:00
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#include "Utils.h"
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2016-01-26 18:06:31 +00:00
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#include "CRC.h"
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#include "Log.h"
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#include <cstdio>
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#include <cassert>
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2016-02-29 06:37:27 +00:00
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#include <cstring>
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2016-01-26 18:06:31 +00:00
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2016-02-22 18:12:24 +00:00
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CDMRDataHeader::CDMRDataHeader() :
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m_data(NULL),
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2016-02-25 17:31:43 +00:00
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m_GI(false),
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m_A(false),
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2016-01-26 18:06:31 +00:00
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m_srcId(0U),
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m_dstId(0U),
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2016-02-25 17:31:43 +00:00
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m_blocks(0U),
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m_F(false),
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m_S(false),
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m_Ns(0U)
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2016-01-26 18:06:31 +00:00
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{
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2016-02-22 18:12:24 +00:00
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m_data = new unsigned char[12U];
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}
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2016-01-26 18:06:31 +00:00
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2016-02-22 18:12:24 +00:00
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CDMRDataHeader::~CDMRDataHeader()
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{
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delete[] m_data;
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}
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2016-01-26 18:06:31 +00:00
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2016-02-22 18:12:24 +00:00
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bool CDMRDataHeader::put(const unsigned char* bytes)
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{
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assert(bytes != NULL);
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2016-01-26 18:06:31 +00:00
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2016-02-22 18:12:24 +00:00
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CBPTC19696 bptc;
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bptc.decode(bytes, m_data);
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2016-01-26 18:06:31 +00:00
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2016-02-22 18:12:24 +00:00
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m_data[10U] ^= DATA_HEADER_CRC_MASK[0U];
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m_data[11U] ^= DATA_HEADER_CRC_MASK[1U];
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2016-01-26 18:06:31 +00:00
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2016-02-22 18:12:24 +00:00
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bool valid = CCRC::checkCCITT162(m_data, 12U);
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if (!valid)
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return false;
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2016-01-26 18:06:31 +00:00
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2016-02-22 18:12:24 +00:00
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// Restore the checksum
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m_data[10U] ^= DATA_HEADER_CRC_MASK[0U];
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m_data[11U] ^= DATA_HEADER_CRC_MASK[1U];
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2016-01-26 18:06:31 +00:00
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2016-02-25 17:31:43 +00:00
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m_GI = (m_data[0U] & 0x80U) == 0x80U;
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m_A = (m_data[0U] & 0x40U) == 0x40U;
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unsigned char dpf = m_data[0U] & 0x0FU;
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if (dpf == DPF_PROPRIETARY)
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return true;
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2016-02-22 18:12:24 +00:00
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m_dstId = m_data[2U] << 16 | m_data[3U] << 8 | m_data[4U];
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m_srcId = m_data[5U] << 16 | m_data[6U] << 8 | m_data[7U];
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2016-02-25 17:31:43 +00:00
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switch (dpf) {
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case DPF_UNCONFIRMED_DATA:
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CUtils::dump("Unconfirmed Data Header", m_data, 12U);
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m_F = (m_data[8U] & 0x80U) == 0x80U;
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m_blocks = m_data[8U] & 0x7FU;
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break;
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case DPF_CONFIRMED_DATA:
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CUtils::dump("Confirmed Data Header", m_data, 12U);
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m_F = (m_data[8U] & 0x80U) == 0x80U;
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m_blocks = m_data[8U] & 0x7FU;
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m_S = (m_data[9U] & 0x80U) == 0x80U;
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m_Ns = (m_data[9U] >> 4) & 0x07U;
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break;
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case DPF_RESPONSE:
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CUtils::dump("Response Data Header", m_data, 12U);
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m_blocks = m_data[8U] & 0x7FU;
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break;
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case DPF_PROPRIETARY:
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CUtils::dump("Proprietary Data Header", m_data, 12U);
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break;
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case DPF_DEFINED_RAW:
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CUtils::dump("Raw or Status/Precoded Short Data Header", m_data, 12U);
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m_F = (m_data[8U] & 0x01U) == 0x01U;
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m_S = (m_data[8U] & 0x02U) == 0x02U;
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break;
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case DPF_DEFINED_SHORT:
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CUtils::dump("Defined Short Data Header", m_data, 12U);
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m_F = (m_data[8U] & 0x01U) == 0x01U;
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m_S = (m_data[8U] & 0x02U) == 0x02U;
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break;
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case DPF_UDT:
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CUtils::dump("Unified Data Transport Header", m_data, 12U);
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break;
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default:
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CUtils::dump("Unknown Data Header", m_data, 12U);
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break;
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}
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2016-02-22 18:12:24 +00:00
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return true;
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2016-01-26 18:06:31 +00:00
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}
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2016-02-22 18:12:24 +00:00
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void CDMRDataHeader::get(unsigned char* bytes) const
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{
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2016-02-22 18:12:24 +00:00
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assert(bytes != NULL);
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CBPTC19696 bptc;
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bptc.encode(m_data, bytes);
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2016-01-26 18:06:31 +00:00
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}
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bool CDMRDataHeader::getGI() const
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{
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2016-02-25 17:31:43 +00:00
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return m_GI;
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}
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2016-01-26 18:06:31 +00:00
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unsigned int CDMRDataHeader::getSrcId() const
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{
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return m_srcId;
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}
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unsigned int CDMRDataHeader::getDstId() const
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{
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return m_dstId;
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}
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unsigned int CDMRDataHeader::getBlocks() const
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{
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return m_blocks;
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}
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2016-02-25 17:31:43 +00:00
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2016-02-28 18:22:17 +00:00
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void CDMRDataHeader::getTerminator(unsigned char* bytes) const
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{
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2016-02-28 18:22:17 +00:00
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assert(bytes != NULL);
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2016-02-25 17:31:43 +00:00
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2016-02-28 18:22:17 +00:00
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unsigned char payload[12U];
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::memset(payload, 0x00U, 12U);
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payload[0U] = m_GI ? FLCO_GROUP : FLCO_USER_USER;
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payload[1U] = FID_ETSI;
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payload[2U] = (m_dstId >> 16) & 0xFFU;
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payload[3U] = (m_dstId >> 8) & 0xFFU;
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payload[4U] = (m_dstId >> 0) & 0xFFU;
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payload[5U] = (m_srcId >> 16) & 0xFFU;
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payload[6U] = (m_srcId >> 8) & 0xFFU;
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payload[7U] = (m_srcId >> 0) & 0xFFU;
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payload[8U] |= m_GI ? 0x80U : 0x00U;
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payload[8U] |= m_A ? 0x40U : 0x00U;
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payload[8U] |= m_F ? 0x20U : 0x00U;
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payload[8U] |= m_S ? 0x08U : 0x00U;
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payload[8U] |= m_Ns & 0x07U;
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unsigned char parity[4U];
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CRS129::encode(payload, 9U, parity);
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payload[9U] = parity[2U] ^ TERMINATOR_WITH_LC_CRC_MASK[0U];
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payload[10U] = parity[1U] ^ TERMINATOR_WITH_LC_CRC_MASK[1U];
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payload[11U] = parity[0U] ^ TERMINATOR_WITH_LC_CRC_MASK[2U];
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CBPTC19696 bptc;
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bptc.encode(payload, bytes);
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2016-02-25 17:31:43 +00:00
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}
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2016-02-28 18:22:17 +00:00
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CDMRDataHeader& CDMRDataHeader::operator=(const CDMRDataHeader& header)
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2016-02-25 17:31:43 +00:00
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{
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2016-02-28 18:22:17 +00:00
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if (&header != this) {
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::memcpy(m_data, header.m_data, 12U);
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m_GI = header.m_GI;
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m_A = header.m_A;
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m_srcId = header.m_srcId;
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m_dstId = header.m_dstId;
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m_blocks = header.m_blocks;
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m_F = header.m_F;
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m_S = header.m_S;
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m_Ns = header.m_Ns;
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}
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return *this;
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2016-02-25 17:31:43 +00:00
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}
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