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239 lines
6.5 KiB
239 lines
6.5 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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// Based on code from the MMDVMHost project. (https://github.com/g4klx/MMDVMHost)
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// Licensed under the GPLv2 License (https://opensource.org/licenses/GPL-2.0)
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//
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/*
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* Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
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* Copyright (C) 2019 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 "dmr/lc/CSBK.h"
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#include "edac/BPTC19696.h"
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#include "edac/CRC.h"
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#include "Log.h"
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#include "Utils.h"
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using namespace dmr::lc;
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using namespace dmr;
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#include <cstdio>
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#include <cassert>
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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 CSBK class.
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/// </summary>
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CSBK::CSBK() :
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m_verbose(false),
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m_CSBKO(CSBKO_NONE),
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m_FID(0x00U),
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m_bsId(0U),
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m_GI(false),
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m_srcId(0U),
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m_dstId(0U),
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m_dataContent(false),
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m_CBF(0U),
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m_data(NULL)
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{
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m_data = new uint8_t[12U];
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}
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/// <summary>
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/// Finalizes a instance of the CSBK class.
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/// </summary>
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CSBK::~CSBK()
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{
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delete[] m_data;
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}
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/// <summary>
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/// Decodes a DMR CSBK.
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/// </summary>
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/// <param name="bytes"></param>
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/// <returns>True, if DMR CSBK was decoded, otherwise false.</returns>
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bool CSBK::decode(const uint8_t* bytes)
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{
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assert(bytes != NULL);
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// decode BPTC (196,96) FEC
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edac::BPTC19696 bptc;
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bptc.decode(bytes, m_data);
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// validate the CRC-CCITT 16
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m_data[10U] ^= CSBK_CRC_MASK[0U];
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m_data[11U] ^= CSBK_CRC_MASK[1U];
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bool valid = edac::CRC::checkCCITT162(m_data, DMR_LC_HEADER_LENGTH_BYTES);
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if (!valid)
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return false;
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// restore the checksum
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m_data[10U] ^= CSBK_CRC_MASK[0U];
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m_data[11U] ^= CSBK_CRC_MASK[1U];
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if (m_verbose) {
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Utils::dump(2U, "Decoded CSBK", m_data, DMR_LC_HEADER_LENGTH_BYTES);
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}
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m_CSBKO = m_data[0U] & 0x3FU;
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m_FID = m_data[1U];
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switch (m_CSBKO) {
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case CSBKO_BSDWNACT:
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m_GI = false;
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m_bsId = m_data[4U] << 16 | m_data[5U] << 8 | m_data[6U];
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m_srcId = m_data[7U] << 16 | m_data[8U] << 8 | m_data[9U];
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m_dataContent = false;
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m_CBF = 0U;
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break;
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case CSBKO_UU_V_REQ:
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m_GI = false;
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m_dstId = m_data[4U] << 16 | m_data[5U] << 8 | m_data[6U];
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m_srcId = m_data[7U] << 16 | m_data[8U] << 8 | m_data[9U];
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m_dataContent = false;
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m_CBF = 0U;
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break;
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case CSBKO_UU_ANS_RSP:
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m_GI = false;
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m_dstId = m_data[4U] << 16 | m_data[5U] << 8 | m_data[6U];
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m_srcId = m_data[7U] << 16 | m_data[8U] << 8 | m_data[9U];
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m_dataContent = false;
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m_CBF = 0U;
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break;
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case CSBKO_PRECCSBK:
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m_GI = (m_data[2U] & 0x40U) == 0x40U;
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m_dstId = m_data[4U] << 16 | m_data[5U] << 8 | m_data[6U];
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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];
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break;
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case CSBKO_CALL_ALRT:
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m_GI = (m_data[2U] & 0x40U) == 0x40U;
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m_dstId = m_data[4U] << 16 | m_data[5U] << 8 | m_data[6U];
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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];
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break;
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case CSBKO_ACK_RSP:
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m_GI = (m_data[2U] & 0x40U) == 0x40U;
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m_dstId = m_data[4U] << 16 | m_data[5U] << 8 | m_data[6U];
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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];
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break;
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case CSBKO_EXT_FNCT:
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m_GI = false;
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m_dstId = m_data[4U] << 16 | m_data[5U] << 8 | m_data[6U];
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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];
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break;
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case CSBKO_NACK_RSP:
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m_GI = false;
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m_srcId = m_data[4U] << 16 | m_data[5U] << 8 | m_data[6U];
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m_dstId = m_data[7U] << 16 | m_data[8U] << 8 | m_data[9U];
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m_dataContent = false;
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m_CBF = 0U;
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break;
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default:
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m_GI = false;
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m_srcId = 0U;
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m_dstId = 0U;
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m_dataContent = false;
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m_CBF = 0U;
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LogError(LOG_DMR, "unknown CSBK type, csbko = $%02X", m_CSBKO);
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return true;
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}
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return true;
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}
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/// <summary>
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/// Encodes a DMR CSBK.
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/// </summary>
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/// <param name="bytes"></param>
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void CSBK::encode(uint8_t* bytes) const
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{
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assert(bytes != NULL);
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m_data[0U] = m_CSBKO;
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m_data[1U] = m_FID;
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if (m_GI) {
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m_data[2U] |= 0x40U;
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}
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if (m_dataContent) {
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m_data[2U] |= 0x80U;
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}
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m_data[3U] = m_CBF;
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if (m_CSBKO == CSBKO_EXT_FNCT) {
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m_data[4U] = (m_srcId >> 16) & 0xFFU;
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m_data[5U] = (m_srcId >> 8) & 0xFFU;
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m_data[6U] = (m_srcId >> 0) & 0xFFU;
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m_data[7U] = (m_dstId >> 16) & 0xFFU;
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m_data[8U] = (m_dstId >> 8) & 0xFFU;
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m_data[9U] = (m_dstId >> 0) & 0xFFU;
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}
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else {
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m_data[4U] = (m_dstId >> 16) & 0xFFU;
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m_data[5U] = (m_dstId >> 8) & 0xFFU;
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m_data[6U] = (m_dstId >> 0) & 0xFFU;
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m_data[7U] = (m_srcId >> 16) & 0xFFU;
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m_data[8U] = (m_srcId >> 8) & 0xFFU;
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m_data[9U] = (m_srcId >> 0) & 0xFFU;
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}
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m_data[10U] ^= CSBK_CRC_MASK[0U];
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m_data[11U] ^= CSBK_CRC_MASK[1U];
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edac::CRC::addCCITT162(m_data, 12U);
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m_data[10U] ^= CSBK_CRC_MASK[0U];
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m_data[11U] ^= CSBK_CRC_MASK[1U];
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if (m_verbose) {
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Utils::dump(2U, "Encoded CSBK", m_data, DMR_LC_HEADER_LENGTH_BYTES);
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}
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// encode BPTC (196,96) FEC
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edac::BPTC19696 bptc;
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bptc.encode(m_data, bytes);
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}
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