MMDVMHost-Private/M17LSF.cpp

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/*
* Copyright (C) 2020,2021 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 "M17LSF.h"
#include "M17Utils.h"
#include "M17Defines.h"
#include "M17CRC.h"
#include <cassert>
#include <cstring>
CM17LSF::CM17LSF() :
m_lsf(NULL),
m_valid(false)
{
m_lsf = new unsigned char[M17_LSF_LENGTH_BYTES];
}
CM17LSF::~CM17LSF()
{
delete[] m_lsf;
}
void CM17LSF::getNetwork(unsigned char* data) const
{
assert(data != NULL);
::memcpy(data, m_lsf, M17_LSF_LENGTH_BYTES);
}
void CM17LSF::setNetwork(const unsigned char* data)
{
assert(data != NULL);
::memcpy(m_lsf, data, M17_LSF_LENGTH_BYTES);
m_valid = true;
}
std::string CM17LSF::getSource() const
{
if (m_lsf[6U] == 0xFFU && m_lsf[7U] == 0xFFU && m_lsf[8U] == 0xFFU &&
m_lsf[9U] == 0xFFU && m_lsf[10U] == 0xFFU && m_lsf[11U] == 0xFFU)
return "******";
std::string callsign;
CM17Utils::decodeCallsign(m_lsf + 6U, callsign);
return callsign;
}
void CM17LSF::setSource(const std::string& callsign)
{
CM17Utils::encodeCallsign(callsign, m_lsf + 6U);
}
std::string CM17LSF::getDest() const
{
if (m_lsf[0U] == 0xFFU && m_lsf[1U] == 0xFFU && m_lsf[2U] == 0xFFU &&
m_lsf[3U] == 0xFFU && m_lsf[4U] == 0xFFU && m_lsf[5U] == 0xFFU)
return "******";
std::string callsign;
CM17Utils::decodeCallsign(m_lsf + 0U, callsign);
return callsign;
}
void CM17LSF::setDest(const std::string& callsign)
{
CM17Utils::encodeCallsign(callsign, m_lsf + 0U);
}
unsigned char CM17LSF::getPacketStream() const
{
return m_lsf[13U] & 0x01U;
}
void CM17LSF::setPacketStream(unsigned char ps)
{
m_lsf[13U] &= 0xF7U;
m_lsf[13U] |= ps & 0x01U;
}
unsigned char CM17LSF::getDataType() const
{
return (m_lsf[13U] >> 1) & 0x03U;
}
void CM17LSF::setDataType(unsigned char type)
{
m_lsf[13U] &= 0xF9U;
m_lsf[13U] |= (type << 1) & 0x06U;
}
unsigned char CM17LSF::getEncryptionType() const
{
return (m_lsf[13U] >> 3) & 0x03U;
}
void CM17LSF::setEncryptionType(unsigned char type)
{
m_lsf[13U] &= 0xE7U;
m_lsf[13U] |= (type << 3) & 0x18U;
}
unsigned char CM17LSF::getEncryptionSubType() const
{
return (m_lsf[13U] >> 5) & 0x03U;
}
void CM17LSF::setEncryptionSubType(unsigned char type)
{
m_lsf[13U] &= 0x9FU;
m_lsf[13U] |= (type << 5) & 0x60U;
}
unsigned char CM17LSF::getCAN() const
{
return ((m_lsf[12U] << 1) & 0x0EU) | ((m_lsf[13U] >> 7) & 0x01U);
}
void CM17LSF::setCAN(unsigned char can)
{
m_lsf[13U] &= 0x7FU;
m_lsf[13U] |= (can << 7) & 0x80U;
m_lsf[12U] &= 0xF8U;
m_lsf[12U] |= (can >> 1) & 0x07U;
}
void CM17LSF::reset()
{
::memset(m_lsf, 0x00U, 30U);
m_valid = false;
}
bool CM17LSF::isValid() const
{
return m_valid;
}
void CM17LSF::getLinkSetup(unsigned char* data) const
{
assert(data != NULL);
::memcpy(data, m_lsf, M17_LSF_LENGTH_BYTES);
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CM17CRC::encodeCRC16(data, M17_LSF_LENGTH_BYTES);
}
void CM17LSF::setLinkSetup(const unsigned char* data)
{
assert(data != NULL);
::memcpy(m_lsf, data, M17_LSF_LENGTH_BYTES);
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m_valid = CM17CRC::checkCRC16(m_lsf, M17_LSF_LENGTH_BYTES);
}
void CM17LSF::getFragment(unsigned char* data, unsigned int n) const
{
assert(data != NULL);
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CM17CRC::encodeCRC16(m_lsf, M17_LSF_LENGTH_BYTES);
::memcpy(data, m_lsf + (n * M17_LSF_FRAGMENT_LENGTH_BYTES), M17_LSF_FRAGMENT_LENGTH_BYTES);
}
void CM17LSF::setFragment(const unsigned char* data, unsigned int n)
{
assert(data != NULL);
::memcpy(m_lsf + (n * M17_LSF_FRAGMENT_LENGTH_BYTES), data, M17_LSF_FRAGMENT_LENGTH_BYTES);
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m_valid = CM17CRC::checkCRC16(m_lsf, M17_LSF_LENGTH_BYTES);
}