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147 lines
4.1 KiB
147 lines
4.1 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 "dmr/lc/csbk/CSBKFactory.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::csbk;
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using namespace dmr::lc;
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using namespace dmr;
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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 CSBKFactory class.
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/// </summary>
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CSBKFactory::CSBKFactory()
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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 CSBKFactory class.
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/// </summary>
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CSBKFactory::~CSBKFactory()
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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 CSBK.
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/// </summary>
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/// <param name="data"></param>
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/// <returns>True, if CSBK was decoded, otherwise false.</returns>
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std::unique_ptr<CSBK> CSBKFactory::createCSBK(const uint8_t* data)
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{
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assert(data != nullptr);
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uint8_t csbk[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 nullptr;
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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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uint8_t CSBKO = csbk[0U] & 0x3FU; // CSBKO
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uint8_t FID = csbk[1U]; // Feature ID
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switch (CSBKO) {
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case CSBKO_BSDWNACT:
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return decode(new CSBK_BSDWNACT(), data);
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case CSBKO_UU_V_REQ:
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return decode(new CSBK_UU_V_REQ(), data);
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case CSBKO_UU_ANS_RSP:
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return decode(new CSBK_UU_ANS_RSP(), data);
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case CSBKO_PRECCSBK:
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return decode(new CSBK_PRECCSBK(), data);
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case CSBKO_RAND: // CSBKO_CALL_ALRT when FID == FID_DMRA
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switch (FID)
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{
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case FID_DMRA:
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return decode(new CSBK_CALL_ALRT(), data);
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case FID_ETSI:
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default:
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return decode(new CSBK_RAND(), data);
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}
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case CSBKO_EXT_FNCT:
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return decode(new CSBK_EXT_FNCT(), data);
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case CSBKO_NACK_RSP:
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return decode(new CSBK_NACK_RSP(), data);
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/** Tier 3 */
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case CSBKO_ACK_RSP:
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return decode(new CSBK_ACK_RSP(), data);
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default:
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LogError(LOG_DMR, "CSBKFactory::create(), unknown CSBK type, csbko = $%02X", CSBKO);
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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="csbk"></param>
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/// <param name="data"></param>
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/// <returns></returns>
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std::unique_ptr<CSBK> CSBKFactory::decode(CSBK* csbk, const uint8_t* data)
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{
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assert(csbk != nullptr);
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assert(data != nullptr);
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if (!csbk->decode(data)) {
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return nullptr;
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}
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return std::unique_ptr<CSBK>(csbk);
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}
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