101 lines
2.6 KiB
C++
101 lines
2.6 KiB
C++
/*
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* Copyright (C) 2012 by Ian Wraith
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* Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
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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 "FullLC.h"
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#include "Log.h"
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#include "DMRDefines.h"
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#include "RS129.h"
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#include <cstdio>
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#include <cassert>
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CFullLC::CFullLC() :
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m_bptc()
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{
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}
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CFullLC::~CFullLC()
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{
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}
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CLC* CFullLC::decode(const unsigned char* data, unsigned char type)
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{
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assert(data != NULL);
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unsigned char lcData[12U];
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m_bptc.decode(data, lcData);
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switch (type) {
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case DT_VOICE_LC_HEADER:
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lcData[9U] ^= VOICE_LC_HEADER_CRC_MASK[0U];
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lcData[10U] ^= VOICE_LC_HEADER_CRC_MASK[1U];
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lcData[11U] ^= VOICE_LC_HEADER_CRC_MASK[2U];
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break;
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case DT_TERMINATOR_WITH_LC:
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lcData[9U] ^= TERMINATOR_WITH_LC_CRC_MASK[0U];
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lcData[10U] ^= TERMINATOR_WITH_LC_CRC_MASK[1U];
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lcData[11U] ^= TERMINATOR_WITH_LC_CRC_MASK[2U];
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break;
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default:
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::LogError("Unsupported LC type - %d", int(type));
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return NULL;
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}
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if (!CRS129::check(lcData)) {
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::LogDebug("Checksum failed for the LC");
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CLC lc(lcData);
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LogDebug("Invalid LC, src = %u, dst = %s%u", lc.getSrcId(), lc.getFLCO() == FLCO_GROUP ? "TG " : "", lc.getDstId());
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return NULL;
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}
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return new CLC(lcData);
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}
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void CFullLC::encode(const CLC& lc, unsigned char* data, unsigned char type)
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{
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assert(data != NULL);
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unsigned char lcData[12U];
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lc.getData(lcData);
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unsigned char parity[4U];
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CRS129::encode(lcData, 9U, parity);
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switch (type) {
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case DT_VOICE_LC_HEADER:
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lcData[9U] = parity[2U] ^ VOICE_LC_HEADER_CRC_MASK[0U];
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lcData[10U] = parity[1U] ^ VOICE_LC_HEADER_CRC_MASK[1U];
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lcData[11U] = parity[0U] ^ VOICE_LC_HEADER_CRC_MASK[2U];
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break;
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case DT_TERMINATOR_WITH_LC:
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lcData[9U] = parity[2U] ^ TERMINATOR_WITH_LC_CRC_MASK[0U];
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lcData[10U] = parity[1U] ^ TERMINATOR_WITH_LC_CRC_MASK[1U];
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lcData[11U] = parity[0U] ^ TERMINATOR_WITH_LC_CRC_MASK[2U];
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break;
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default:
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::LogError("Unsupported LC type - %d", int(type));
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return;
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}
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m_bptc.encode(lcData, data);
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}
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