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dvmhost/p25/NID.cpp

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/**
* Digital Voice Modem - Host Software
* GPLv2 Open Source. Use is subject to license terms.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* @package DVM / Host Software
*
*/
//
// Based on code from the MMDVMHost project. (https://github.com/g4klx/MMDVMHost)
// Licensed under the GPLv2 License (https://opensource.org/licenses/GPL-2.0)
//
/*
* Copyright (C) 2016 by Jonathan Naylor G4KLX
* Copyright (C) 2017,2022 by Bryan Biedenkapp N2PLL
*
* 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 "Defines.h"
#include "p25/P25Defines.h"
#include "p25/NID.h"
#include "p25/P25Utils.h"
#include "edac/BCH.h"
using namespace p25;
#include <cstdio>
#include <cassert>
// ---------------------------------------------------------------------------
// Constants
// ---------------------------------------------------------------------------
const uint32_t MAX_NID_ERRS = 7U;//5U;
// ---------------------------------------------------------------------------
// Public Class Members
// ---------------------------------------------------------------------------
/// <summary>
/// Initializes a new instance of the NID class.
/// </summary>
/// <param name="nac">P25 Network Access Code.</param>
NID::NID(uint32_t nac) :
m_duid(0U),
m_nac(nac),
m_rxHdu(NULL),
m_rxTdu(NULL),
m_rxLdu1(NULL),
m_rxPdu(NULL),
m_rxTsdu(NULL),
m_rxLdu2(NULL),
m_rxTdulc(NULL),
m_splitNac(false),
m_txHdu(NULL),
m_txTdu(NULL),
m_txLdu1(NULL),
m_txPdu(NULL),
m_txTsdu(NULL),
m_txLdu2(NULL),
m_txTdulc(NULL)
{
createRxNID(nac);
}
/// <summary>
/// Finalizes a instance of the NID class.
/// </summary>
NID::~NID()
{
delete[] m_rxHdu;
delete[] m_rxTdu;
delete[] m_rxLdu1;
delete[] m_rxPdu;
delete[] m_rxTsdu;
delete[] m_rxLdu2;
delete[] m_rxTdulc;
if (m_splitNac) {
delete[] m_txHdu;
delete[] m_txTdu;
delete[] m_txLdu1;
delete[] m_txPdu;
delete[] m_txTsdu;
delete[] m_txLdu2;
delete[] m_txTdulc;
}
}
/// <summary>
/// Decodes P25 network identifier data.
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
bool NID::decode(const uint8_t* data)
{
assert(data != NULL);
uint8_t nid[P25_NID_LENGTH_BYTES];
P25Utils::decode(data, nid, 48U, 114U);
uint32_t errs = P25Utils::compare(nid, m_rxLdu1, P25_NID_LENGTH_BYTES);
if (errs < MAX_NID_ERRS) {
m_duid = P25_DUID_LDU1;
return true;
}
errs = P25Utils::compare(nid, m_rxLdu2, P25_NID_LENGTH_BYTES);
if (errs < MAX_NID_ERRS) {
m_duid = P25_DUID_LDU2;
return true;
}
errs = P25Utils::compare(nid, m_rxTdu, P25_NID_LENGTH_BYTES);
if (errs < MAX_NID_ERRS) {
m_duid = P25_DUID_TDU;
return true;
}
errs = P25Utils::compare(nid, m_rxTdulc, P25_NID_LENGTH_BYTES);
if (errs < MAX_NID_ERRS) {
m_duid = P25_DUID_TDULC;
return true;
}
errs = P25Utils::compare(nid, m_rxPdu, P25_NID_LENGTH_BYTES);
if (errs < MAX_NID_ERRS) {
m_duid = P25_DUID_PDU;
return true;
}
errs = P25Utils::compare(nid, m_rxTsdu, P25_NID_LENGTH_BYTES);
if (errs < MAX_NID_ERRS) {
m_duid = P25_DUID_TSDU;
return true;
}
errs = P25Utils::compare(nid, m_rxHdu, P25_NID_LENGTH_BYTES);
if (errs < MAX_NID_ERRS) {
m_duid = P25_DUID_HDU;
return true;
}
return false;
}
/// <summary>
/// Encodes P25 network identifier data.
/// </summary>
/// <param name="data"></param>
/// <param name="duid"></param>
void NID::encode(uint8_t* data, uint8_t duid) const
{
assert(data != NULL);
if (m_splitNac) {
switch (duid) {
case P25_DUID_HDU:
P25Utils::encode(m_txHdu, data, 48U, 114U);
break;
case P25_DUID_TDU:
P25Utils::encode(m_txTdu, data, 48U, 114U);
break;
case P25_DUID_LDU1:
P25Utils::encode(m_txLdu1, data, 48U, 114U);
break;
case P25_DUID_PDU:
P25Utils::encode(m_txPdu, data, 48U, 114U);
break;
case P25_DUID_TSDU:
P25Utils::encode(m_txTsdu, data, 48U, 114U);
break;
case P25_DUID_LDU2:
P25Utils::encode(m_txLdu2, data, 48U, 114U);
break;
case P25_DUID_TDULC:
P25Utils::encode(m_txTdulc, data, 48U, 114U);
break;
default:
break;
}
}
else {
switch (duid) {
case P25_DUID_HDU:
P25Utils::encode(m_rxHdu, data, 48U, 114U);
break;
case P25_DUID_TDU:
P25Utils::encode(m_rxTdu, data, 48U, 114U);
break;
case P25_DUID_LDU1:
P25Utils::encode(m_rxLdu1, data, 48U, 114U);
break;
case P25_DUID_PDU:
P25Utils::encode(m_rxPdu, data, 48U, 114U);
break;
case P25_DUID_TSDU:
P25Utils::encode(m_rxTsdu, data, 48U, 114U);
break;
case P25_DUID_LDU2:
P25Utils::encode(m_rxLdu2, data, 48U, 114U);
break;
case P25_DUID_TDULC:
P25Utils::encode(m_rxTdulc, data, 48U, 114U);
break;
default:
break;
}
}
}
/// <summary>
/// Helper to configure a separate Tx NAC.
/// </summary>
/// <param name="nac"></param>
void NID::setTxNAC(uint32_t nac)
{
if (nac == m_nac) {
return;
}
m_splitNac = true;
createTxNID(nac);
}
// ---------------------------------------------------------------------------
// Private Class Members
// ---------------------------------------------------------------------------
/// <summary>
///
/// </summary>
/// <param name="nac"></param>
void NID::createRxNID(uint32_t nac)
{
edac::BCH bch;
m_rxHdu = new uint8_t[P25_NID_LENGTH_BYTES];
m_rxHdu[0U] = (nac >> 4) & 0xFFU;
m_rxHdu[1U] = (nac << 4) & 0xF0U;
m_rxHdu[1U] |= P25_DUID_HDU;
bch.encode(m_rxHdu);
m_rxHdu[7U] &= 0xFEU; // Clear the parity bit
m_rxTdu = new uint8_t[P25_NID_LENGTH_BYTES];
m_rxTdu[0U] = (nac >> 4) & 0xFFU;
m_rxTdu[1U] = (nac << 4) & 0xF0U;
m_rxTdu[1U] |= P25_DUID_TDU;
bch.encode(m_rxTdu);
m_rxTdu[7U] &= 0xFEU; // Clear the parity bit
m_rxLdu1 = new uint8_t[P25_NID_LENGTH_BYTES];
m_rxLdu1[0U] = (nac >> 4) & 0xFFU;
m_rxLdu1[1U] = (nac << 4) & 0xF0U;
m_rxLdu1[1U] |= P25_DUID_LDU1;
bch.encode(m_rxLdu1);
m_rxLdu1[7U] |= 0x01U; // Set the parity bit
m_rxPdu = new uint8_t[P25_NID_LENGTH_BYTES];
m_rxPdu[0U] = (nac >> 4) & 0xFFU;
m_rxPdu[1U] = (nac << 4) & 0xF0U;
m_rxPdu[1U] |= P25_DUID_PDU;
bch.encode(m_rxPdu);
m_rxPdu[7U] &= 0xFEU; // Clear the parity bit
m_rxTsdu = new uint8_t[P25_NID_LENGTH_BYTES];
m_rxTsdu[0U] = (nac >> 4) & 0xFFU;
m_rxTsdu[1U] = (nac << 4) & 0xF0U;
m_rxTsdu[1U] |= P25_DUID_TSDU;
bch.encode(m_rxTsdu);
m_rxTsdu[7U] &= 0xFEU; // Clear the parity bit
m_rxLdu2 = new uint8_t[P25_NID_LENGTH_BYTES];
m_rxLdu2[0U] = (nac >> 4) & 0xFFU;
m_rxLdu2[1U] = (nac << 4) & 0xF0U;
m_rxLdu2[1U] |= P25_DUID_LDU2;
bch.encode(m_rxLdu2);
m_rxLdu2[7U] |= 0x01U; // Set the parity bit
m_rxTdulc = new uint8_t[P25_NID_LENGTH_BYTES];
m_rxTdulc[0U] = (nac >> 4) & 0xFFU;
m_rxTdulc[1U] = (nac << 4) & 0xF0U;
m_rxTdulc[1U] |= P25_DUID_TDULC;
bch.encode(m_rxTdulc);
m_rxTdulc[7U] &= 0xFEU; // Clear the parity bit
}
/// <summary>
///
/// </summary>
/// <param name="nac"></param>
void NID::createTxNID(uint32_t nac)
{
edac::BCH bch;
m_txHdu = new uint8_t[P25_NID_LENGTH_BYTES];
m_txHdu[0U] = (nac >> 4) & 0xFFU;
m_txHdu[1U] = (nac << 4) & 0xF0U;
m_txHdu[1U] |= P25_DUID_HDU;
bch.encode(m_txHdu);
m_txHdu[7U] &= 0xFEU; // Clear the parity bit
m_txTdu = new uint8_t[P25_NID_LENGTH_BYTES];
m_txTdu[0U] = (nac >> 4) & 0xFFU;
m_txTdu[1U] = (nac << 4) & 0xF0U;
m_txTdu[1U] |= P25_DUID_TDU;
bch.encode(m_txTdu);
m_txTdu[7U] &= 0xFEU; // Clear the parity bit
m_txLdu1 = new uint8_t[P25_NID_LENGTH_BYTES];
m_txLdu1[0U] = (nac >> 4) & 0xFFU;
m_txLdu1[1U] = (nac << 4) & 0xF0U;
m_txLdu1[1U] |= P25_DUID_LDU1;
bch.encode(m_txLdu1);
m_txLdu1[7U] |= 0x01U; // Set the parity bit
m_txPdu = new uint8_t[P25_NID_LENGTH_BYTES];
m_txPdu[0U] = (nac >> 4) & 0xFFU;
m_txPdu[1U] = (nac << 4) & 0xF0U;
m_txPdu[1U] |= P25_DUID_PDU;
bch.encode(m_txPdu);
m_txPdu[7U] &= 0xFEU; // Clear the parity bit
m_txTsdu = new uint8_t[P25_NID_LENGTH_BYTES];
m_txTsdu[0U] = (nac >> 4) & 0xFFU;
m_txTsdu[1U] = (nac << 4) & 0xF0U;
m_txTsdu[1U] |= P25_DUID_TSDU;
bch.encode(m_txTsdu);
m_txTsdu[7U] &= 0xFEU; // Clear the parity bit
m_txLdu2 = new uint8_t[P25_NID_LENGTH_BYTES];
m_txLdu2[0U] = (nac >> 4) & 0xFFU;
m_txLdu2[1U] = (nac << 4) & 0xF0U;
m_txLdu2[1U] |= P25_DUID_LDU2;
bch.encode(m_txLdu2);
m_txLdu2[7U] |= 0x01U; // Set the parity bit
m_txTdulc = new uint8_t[P25_NID_LENGTH_BYTES];
m_txTdulc[0U] = (nac >> 4) & 0xFFU;
m_txTdulc[1U] = (nac << 4) & 0xF0U;
m_txTdulc[1U] |= P25_DUID_TDULC;
bch.encode(m_txTdulc);
m_txTdulc[7U] &= 0xFEU; // Clear the parity bit
}
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