MMDVMHost-Private/DMRDataHeader.cpp

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2016-01-26 18:06:31 +00:00
/*
* Copyright (C) 2012 by Ian Wraith
* Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "DMRDataHeader.h"
#include "DMRDefines.h"
#include "CRC.h"
#include "Log.h"
#include <cstdio>
#include <cassert>
CDMRDataHeader::CDMRDataHeader(const unsigned char* data) :
m_bptc(),
m_valid(false),
m_gi(false),
m_srcId(0U),
m_dstId(0U),
m_blocks(0U)
{
assert(data != NULL);
unsigned char header[12U];
m_bptc.decode(data, header);
header[10U] ^= DATA_HEADER_CRC_MASK[0U];
header[11U] ^= DATA_HEADER_CRC_MASK[1U];
m_valid = CCRC::checkCCITT16(header, 12U);
m_gi = (header[0U] & 0x80U) == 0x80U;
m_dstId = data[2U] << 16 | data[3U] << 8 | data[4U];
m_srcId = data[5U] << 16 | data[6U] << 8 | data[7U];
m_blocks = data[8U] & 0x7FU;
}
CDMRDataHeader::~CDMRDataHeader()
{
}
bool CDMRDataHeader::isValid() const
{
return m_valid;
}
bool CDMRDataHeader::getGI() const
{
return m_gi;
}
unsigned int CDMRDataHeader::getSrcId() const
{
return m_srcId;
}
unsigned int CDMRDataHeader::getDstId() const
{
return m_dstId;
}
unsigned int CDMRDataHeader::getBlocks() const
{
return m_blocks;
}