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278 lines
7.4 KiB
278 lines
7.4 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) 2017-2022 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/P25Defines.h"
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#include "p25/lc/TDULC.h"
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#include "p25/P25Utils.h"
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#include "edac/CRC.h"
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#include "edac/Golay24128.h"
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#include "Log.h"
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#include "Utils.h"
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using namespace p25::lc;
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using namespace p25;
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#include <cstdio>
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#include <cmath>
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#include <cassert>
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#include <cstring>
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// ---------------------------------------------------------------------------
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// Static Class Members
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// ---------------------------------------------------------------------------
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bool TDULC::m_verbose = false;
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SiteData TDULC::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 TDULC class.
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/// </summary>
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/// <param name="data"></param>
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TDULC::TDULC(const TDULC& data) : TDULC()
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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 TDULC class.
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/// </summary>
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/// <param name="lc"></param>
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TDULC::TDULC(LC* lc) : TDULC()
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{
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m_protect = lc->m_protect;
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m_lco = lc->m_lco;
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m_mfId = lc->m_mfId;
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m_srcId = lc->m_srcId;
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m_dstId = lc->m_dstId;
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m_grpVchNo = lc->m_grpVchNo;
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m_emergency = lc->m_emergency;
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m_encrypted = lc->m_encrypted;
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m_priority = lc->m_priority;
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m_group = lc->m_group;
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m_callTimer = lc->m_callTimer;
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}
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/// <summary>
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/// Initializes a new instance of the TDULC class.
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/// </summary>
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TDULC::TDULC() :
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m_protect(false),
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m_lco(LC_GROUP),
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m_mfId(P25_MFG_STANDARD),
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m_srcId(0U),
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m_dstId(0U),
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m_grpVchNo(0U),
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m_emergency(false),
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m_encrypted(false),
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m_priority(4U),
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m_group(true),
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m_siteIdenEntry(lookups::IdenTable()),
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m_rs(),
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m_implicit(false),
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m_callTimer(0U)
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{
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m_grpVchNo = m_siteData.channelNo();
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}
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/// <summary>
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/// Finalizes a instance of TDULC class.
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/// </summary>
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TDULC::~TDULC()
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{
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/* stub */
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}
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// ---------------------------------------------------------------------------
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// Private Class Members
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// ---------------------------------------------------------------------------
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/// <summary>
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/// Internal helper to convert RS 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 TDULC::toValue(const uint8_t* rs)
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{
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ulong64_t rsValue = 0U;
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// combine bytes into ulong64_t (8 byte) value
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rsValue = rs[1U];
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rsValue = (rsValue << 8) + rs[2U];
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rsValue = (rsValue << 8) + rs[3U];
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rsValue = (rsValue << 8) + rs[4U];
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rsValue = (rsValue << 8) + rs[5U];
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rsValue = (rsValue << 8) + rs[6U];
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rsValue = (rsValue << 8) + rs[7U];
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rsValue = (rsValue << 8) + rs[8U];
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return rsValue;
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}
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/// <summary>
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/// Internal helper to convert a 64-bit long value to RS bytes.
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/// </summary>
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/// <param name="rsValue"></param>
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/// <returns></returns>
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std::unique_ptr<uint8_t[]> TDULC::fromValue(const ulong64_t rsValue)
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{
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__UNIQUE_BUFFER(rs, uint8_t, P25_TDULC_LENGTH_BYTES);
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// split ulong64_t (8 byte) value into bytes
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rs[1U] = (uint8_t)((rsValue >> 56) & 0xFFU);
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rs[2U] = (uint8_t)((rsValue >> 48) & 0xFFU);
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rs[3U] = (uint8_t)((rsValue >> 40) & 0xFFU);
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rs[4U] = (uint8_t)((rsValue >> 32) & 0xFFU);
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rs[5U] = (uint8_t)((rsValue >> 24) & 0xFFU);
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rs[6U] = (uint8_t)((rsValue >> 16) & 0xFFU);
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rs[7U] = (uint8_t)((rsValue >> 8) & 0xFFU);
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rs[8U] = (uint8_t)((rsValue >> 0) & 0xFFU);
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return rs;
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}
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/// <summary>
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/// Internal helper to 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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/// <param name="rs"></param>
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/// <returns>True, if TDULC was decoded, otherwise false.</returns>
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bool TDULC::decode(const uint8_t* data, uint8_t* rs)
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{
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assert(data != nullptr);
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assert(rs != nullptr);
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// deinterleave
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uint8_t raw[P25_TDULC_FEC_LENGTH_BYTES + 1U];
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P25Utils::decode(data, raw, 114U, 410U);
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// decode Golay (24,12,8) FEC
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edac::Golay24128::decode24128(rs, raw, P25_TDULC_LENGTH_BYTES);
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#if DEBUG_P25_TDULC
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Utils::dump(2U, "TDULC::decode(), TDULC RS", rs, P25_TDULC_LENGTH_BYTES);
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#endif
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// decode RS (24,12,13) FEC
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try {
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bool ret = m_rs.decode241213(rs);
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if (!ret) {
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LogError(LOG_P25, "TDULC::decode(), failed to decode RS (24,12,13) FEC");
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return false;
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}
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}
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catch (...) {
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Utils::dump(2U, "P25, RS excepted with input data", rs, P25_TDULC_LENGTH_BYTES);
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return false;
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}
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if (m_verbose) {
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Utils::dump(2U, "TDULC::decode(), TDULC Value", rs, P25_TDULC_LENGTH_BYTES);
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}
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return true;
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}
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/// <summary>
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/// Internal helper to 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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/// <param name="rs"></param>
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void TDULC::encode(uint8_t* data, const uint8_t* rs)
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{
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assert(data != nullptr);
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assert(rs != nullptr);
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uint8_t outRs[P25_TDULC_LENGTH_BYTES];
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::memset(outRs, 0x00U, P25_TDULC_LENGTH_BYTES);
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::memcpy(outRs, rs, P25_TDULC_LENGTH_BYTES);
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outRs[0U] = m_lco; // LCO
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if (m_implicit)
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outRs[0U] |= 0x40U; // Implicit Operation
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if (m_verbose) {
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Utils::dump(2U, "TDULC::encode(), TDULC Value", outRs, P25_TDULC_LENGTH_BYTES);
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}
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// encode RS (24,12,13) FEC
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m_rs.encode241213(outRs);
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#if DEBUG_P25_TDULC
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Utils::dump(2U, "TDULC::encode(), TDULC RS", outRs, P25_TDULC_LENGTH_BYTES);
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#endif
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uint8_t raw[P25_TDULC_FEC_LENGTH_BYTES + 1U];
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::memset(raw, 0x00U, P25_TDULC_FEC_LENGTH_BYTES + 1U);
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// encode Golay (24,12,8) FEC
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edac::Golay24128::encode24128(raw, outRs, P25_TDULC_LENGTH_BYTES);
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// interleave
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P25Utils::encode(raw, data, 114U, 410U);
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#if DEBUG_P25_TDULC
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Utils::dump(2U, "TDULC::encode(), TDULC Interleave", data, P25_TDULC_FRAME_LENGTH_BYTES + P25_PREAMBLE_LENGTH_BYTES);
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#endif
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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 TDULC::copy(const TDULC& data)
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{
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m_verbose = data.m_verbose;
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m_protect = data.m_protect;
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m_lco = data.m_lco;
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m_mfId = data.m_mfId;
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m_srcId = data.m_srcId;
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m_dstId = data.m_dstId;
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m_grpVchNo = data.m_grpVchNo;
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m_emergency = data.m_emergency;
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m_encrypted = data.m_encrypted;
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m_priority = data.m_priority;
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m_group = data.m_group;
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m_callTimer = data.m_callTimer;
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m_siteData = data.m_siteData;
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m_siteIdenEntry = data.m_siteIdenEntry;
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}
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