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321 lines
8.8 KiB
321 lines
8.8 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) 2019-2021 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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// Static Class Members
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// ---------------------------------------------------------------------------
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bool CSBK::m_verbose = false;
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SiteData CSBK::m_siteData = SiteData();
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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 copy instance of the CSBK class.
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/// </summary>
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/// <param name="data"></param>
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CSBK::CSBK(const CSBK& data) : CSBK()
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{
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copy(data);
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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_colorCode(0U),
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m_lastBlock(true),
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m_Cdef(false),
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m_CSBKO(CSBKO_NONE),
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m_FID(0x00U),
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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_emergency(false),
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m_privacy(false),
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m_supplementData(false),
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m_priority(0U),
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m_broadcast(false),
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m_proxy(false),
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m_response(0U),
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m_reason(0U),
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m_siteOffsetTiming(false),
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m_logicalCh1(DMR_CHNULL),
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m_logicalCh2(DMR_CHNULL),
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m_slotNo(0U),
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m_siteIdenEntry(lookups::IdenTable())
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{
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/* stub */
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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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/* stub */
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}
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/// <summary>
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/// Regenerate a DMR CSBK without decoding.
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/// </summary>
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/// <param name="data"></param>
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/// <returns>True, if TSBK was decoded, otherwise false.</returns>
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bool CSBK::regenerate(uint8_t* data)
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{
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uint8_t csbk[DMR_CSBK_LENGTH_BYTES];
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::memset(csbk, 0x00U, DMR_CSBK_LENGTH_BYTES);
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// decode BPTC (196,96) FEC
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edac::BPTC19696 bptc;
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bptc.decode(data, csbk);
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// validate the CRC-CCITT 16
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csbk[10U] ^= CSBK_CRC_MASK[0U];
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csbk[11U] ^= CSBK_CRC_MASK[1U];
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bool valid = edac::CRC::checkCCITT162(csbk, DMR_CSBK_LENGTH_BYTES);
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if (!valid) {
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LogError(LOG_DMR, "CSBK::decode(), failed CRC CCITT-162 check");
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return false;
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}
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// restore the checksum
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csbk[10U] ^= CSBK_CRC_MASK[0U];
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csbk[11U] ^= CSBK_CRC_MASK[1U];
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// calculate checksum
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csbk[10U] ^= CSBK_CRC_MASK[0U];
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csbk[11U] ^= CSBK_CRC_MASK[1U];
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edac::CRC::addCCITT162(csbk, 12U);
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csbk[10U] ^= CSBK_CRC_MASK[0U];
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csbk[11U] ^= CSBK_CRC_MASK[1U];
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// encode BPTC (196,96) FEC
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bptc.encode(csbk, data);
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return true;
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}
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// ---------------------------------------------------------------------------
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// Protected Class Members
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// ---------------------------------------------------------------------------
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/// <summary>
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/// Internal helper to convert CSBK bytes to a 64-bit long value.
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/// </summary>
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/// <param name="tsbk"></param>
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/// <returns></returns>
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ulong64_t CSBK::toValue(const uint8_t* csbk)
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{
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ulong64_t csbkValue = 0U;
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// combine bytes into ulong64_t (8 byte) value
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csbkValue = csbk[2U];
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csbkValue = (csbkValue << 8) + csbk[3U];
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csbkValue = (csbkValue << 8) + csbk[4U];
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csbkValue = (csbkValue << 8) + csbk[5U];
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csbkValue = (csbkValue << 8) + csbk[6U];
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csbkValue = (csbkValue << 8) + csbk[7U];
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csbkValue = (csbkValue << 8) + csbk[8U];
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csbkValue = (csbkValue << 8) + csbk[9U];
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return csbkValue;
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}
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/// <summary>
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/// Internal helper to convert a 64-bit long value to CSBK bytes.
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/// </summary>
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/// <param name="csbkValue"></param>
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/// <returns></returns>
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std::unique_ptr<uint8_t[]> CSBK::fromValue(const ulong64_t csbkValue)
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{
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__UNIQUE_BUFFER(csbk, uint8_t, DMR_CSBK_LENGTH_BYTES);
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// split ulong64_t (8 byte) value into bytes
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csbk[2U] = (uint8_t)((csbkValue >> 56) & 0xFFU);
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csbk[3U] = (uint8_t)((csbkValue >> 48) & 0xFFU);
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csbk[4U] = (uint8_t)((csbkValue >> 40) & 0xFFU);
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csbk[5U] = (uint8_t)((csbkValue >> 32) & 0xFFU);
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csbk[6U] = (uint8_t)((csbkValue >> 24) & 0xFFU);
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csbk[7U] = (uint8_t)((csbkValue >> 16) & 0xFFU);
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csbk[8U] = (uint8_t)((csbkValue >> 8) & 0xFFU);
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csbk[9U] = (uint8_t)((csbkValue >> 0) & 0xFFU);
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return csbk;
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}
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/// <summary>
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/// Internal helper to decode a control signalling block.
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/// </summary>
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/// <param name="data"></param>
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/// <param name="tsbk"></param>
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/// <returns>True, if TSBK was decoded, otherwise false.</returns>
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bool CSBK::decode(const uint8_t* data, uint8_t* csbk)
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{
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assert(data != nullptr);
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assert(csbk != nullptr);
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// decode BPTC (196,96) FEC
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edac::BPTC19696 bptc;
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bptc.decode(data, csbk);
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// validate the CRC-CCITT 16
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csbk[10U] ^= CSBK_CRC_MASK[0U];
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csbk[11U] ^= CSBK_CRC_MASK[1U];
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bool valid = edac::CRC::checkCCITT162(csbk, DMR_CSBK_LENGTH_BYTES);
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if (!valid) {
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LogError(LOG_DMR, "CSBK::decode(), failed CRC CCITT-162 check");
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return false;
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}
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// restore the checksum
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csbk[10U] ^= CSBK_CRC_MASK[0U];
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csbk[11U] ^= CSBK_CRC_MASK[1U];
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if (m_verbose) {
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Utils::dump(2U, "Decoded CSBK", csbk, DMR_CSBK_LENGTH_BYTES);
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}
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m_CSBKO = csbk[0U] & 0x3FU; // CSBKO
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m_lastBlock = (csbk[0U] & 0x80U) == 0x80U; // Last Block Marker
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m_FID = csbk[1U]; // Feature ID
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m_dataContent = false;
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m_CBF = 0U;
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return true;
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}
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/// <summary>
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/// Internal helper to encode a control signalling block.
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/// </summary>
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/// <param name="data"></param>
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/// <param name="tsbk"></param>
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/// <param name="rawTSBK"></param>
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/// <param name="noTrellis"></param>
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void CSBK::encode(uint8_t* data, const uint8_t* csbk)
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{
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assert(data != nullptr);
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assert(csbk != nullptr);
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uint8_t outCsbk[DMR_CSBK_LENGTH_BYTES];
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::memset(outCsbk, 0x00U, DMR_CSBK_LENGTH_BYTES);
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::memcpy(outCsbk, csbk, DMR_CSBK_LENGTH_BYTES);
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outCsbk[0U] = m_CSBKO; // CSBKO
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outCsbk[0U] |= (m_lastBlock) ? 0x80U : 0x00U; // Last Block Marker
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if (!m_Cdef) {
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outCsbk[1U] = m_FID; // Feature ID
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}
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else {
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outCsbk[1U] = m_colorCode & 0x0FU; // Cdef uses Color Code
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}
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outCsbk[10U] ^= CSBK_CRC_MASK[0U];
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outCsbk[11U] ^= CSBK_CRC_MASK[1U];
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edac::CRC::addCCITT162(outCsbk, 12U);
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outCsbk[10U] ^= CSBK_CRC_MASK[0U];
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outCsbk[11U] ^= CSBK_CRC_MASK[1U];
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if (m_verbose) {
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Utils::dump(2U, "Encoded CSBK", outCsbk, DMR_CSBK_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(outCsbk, data);
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}
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/// <summary>
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/// Internal helper to copy the the class.
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/// </summary>
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/// <param name="data"></param>
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void CSBK::copy(const CSBK& data)
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{
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m_colorCode = data.m_colorCode;
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m_lastBlock = data.m_lastBlock;
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m_Cdef = data.m_Cdef;
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m_CSBKO = data.m_CSBKO;
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m_FID = data.m_FID;
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m_GI = data.m_GI;
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m_srcId = data.m_srcId;
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m_dstId = data.m_dstId;
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m_dataContent = data.m_dataContent;
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m_CBF = data.m_CBF;
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m_emergency = data.m_emergency;
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m_privacy = data.m_privacy;
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m_supplementData = data.m_supplementData;
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m_priority = data.m_priority;
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m_broadcast = data.m_broadcast;
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m_proxy = data.m_proxy;
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m_response = data.m_response;
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m_response = data.m_reason;
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m_siteOffsetTiming = data.m_siteOffsetTiming;
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m_logicalCh1 = data.m_logicalCh1;
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m_logicalCh2 = data.m_logicalCh2;
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m_slotNo = data.m_slotNo;
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m_siteIdenEntry = data.m_siteIdenEntry;
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}
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