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137 lines
3.9 KiB
137 lines
3.9 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) 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/lc/tdulc/TDULCFactory.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::tdulc;
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using namespace p25::lc;
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using namespace p25;
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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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::edac::RS634717 TDULCFactory::m_rs = ::edac::RS634717();
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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 TDULCFactory class.
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/// </summary>
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TDULCFactory::TDULCFactory()
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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 TDULCFactory class.
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/// </summary>
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TDULCFactory::~TDULCFactory()
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{
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/* stub */
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}
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/// <summary>
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/// Create an instance of a TDULC.
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/// </summary>
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/// <param name="data"></param>
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/// <returns>True, if TDULC was decoded, otherwise false.</returns>
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std::unique_ptr<TDULC> TDULCFactory::createTDULC(const uint8_t* data)
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{
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assert(data != nullptr);
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// deinterleave
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uint8_t rs[P25_TDULC_LENGTH_BYTES + 1U];
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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, "TDULCFactory::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, "TDULCFactory::decode(), failed to decode RS (24,12,13) FEC");
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return nullptr;
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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 nullptr;
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}
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uint8_t lco = rs[0U] & 0x3FU; // LCO
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// standard P25 reference opcodes
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switch (lco) {
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case p25::LC_GROUP:
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return decode(new LC_GROUP(), data);
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case p25::LC_PRIVATE:
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return decode(new LC_PRIVATE(), data);
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case p25::LC_TEL_INT_VCH_USER:
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return decode(new LC_TEL_INT_VCH_USER(), data);
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default:
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LogError(LOG_P25, "TDULCFactory::create(), unknown TDULC LCO value, lco = $%02X", lco);
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break;
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}
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return nullptr;
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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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///
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/// </summary>
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/// <param name="tdulc"></param>
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/// <param name="data"></param>
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/// <returns></returns>
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std::unique_ptr<TDULC> TDULCFactory::decode(TDULC* tdulc, const uint8_t* data)
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{
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assert(tdulc != nullptr);
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assert(data != nullptr);
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if (!tdulc->decode(data)) {
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return nullptr;
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}
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return std::unique_ptr<TDULC>(tdulc);
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}
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