110 lines
2.6 KiB
C++
110 lines
2.6 KiB
C++
/*
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* Copyright (C) 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 "P25NID.h"
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#include "P25Defines.h"
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#include "P25Utils.h"
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#include "BCH.h"
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#include <cstdio>
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#include <cassert>
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CP25NID::CP25NID(unsigned int nac) :
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m_duid(0U),
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m_nac(0U),
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m_hdr(NULL),
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m_ldu1(NULL),
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m_ldu2(NULL),
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m_termlc(NULL),
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m_term(NULL)
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{
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CBCH bch;
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m_hdr = new unsigned char[P25_NID_LENGTH_BYTES];
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m_hdr[0U] = (nac >> 4) & 0xFFU;
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m_hdr[1U] = (nac << 4) & 0xF0U;
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m_hdr[1U] |= P25_DUID_HEADER;
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bch.encode(m_hdr);
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m_hdr[7U] &= 0xFEU; // Clear the parity bit
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m_ldu1 = new unsigned char[P25_NID_LENGTH_BYTES];
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m_ldu1[0U] = (nac >> 4) & 0xFFU;
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m_ldu1[1U] = (nac << 4) & 0xF0U;
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m_ldu1[1U] |= P25_DUID_LDU1;
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bch.encode(m_ldu1);
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m_ldu1[7U] |= 0x01U; // Set the parity bit
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m_ldu2 = new unsigned char[P25_NID_LENGTH_BYTES];
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m_ldu2[0U] = (nac >> 4) & 0xFFU;
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m_ldu2[1U] = (nac << 4) & 0xF0U;
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m_ldu2[1U] |= P25_DUID_LDU2;
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bch.encode(m_ldu2);
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m_ldu2[7U] |= 0x01U; // Set the parity bit
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m_termlc = new unsigned char[P25_NID_LENGTH_BYTES];
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m_termlc[0U] = (nac >> 4) & 0xFFU;
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m_termlc[1U] = (nac << 4) & 0xF0U;
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m_termlc[1U] |= P25_DUID_TERM_LC;
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bch.encode(m_termlc);
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m_termlc[7U] &= 0xFEU; // Clear the parity bit
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m_term = new unsigned char[P25_NID_LENGTH_BYTES];
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m_term[0U] = (nac >> 4) & 0xFFU;
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m_term[1U] = (nac << 4) & 0xF0U;
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m_term[1U] |= P25_DUID_TERM;
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bch.encode(m_term);
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m_term[7U] &= 0xFEU; // Clear the parity bit
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}
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CP25NID::~CP25NID()
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{
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delete[] m_hdr;
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delete[] m_ldu1;
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delete[] m_ldu2;
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delete[] m_termlc;
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delete[] m_term;
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}
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bool CP25NID::process(unsigned char* data)
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{
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assert(data != NULL);
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unsigned char nid[P25_NID_LENGTH_BYTES];
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CP25Utils::decode(data, nid, 48U, 114U);
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m_duid = nid[1U] & 0x0FU;
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m_nac = (nid[0U] << 4) & 0xFF0U;
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m_nac |= (nid[1U] >> 4) & 0x00FU;
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CP25Utils::encode(nid, data, 48U, 114U);
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return true;
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}
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unsigned char CP25NID::getDUID() const
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{
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return m_duid;
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}
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unsigned int CP25NID::getNAC() const
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{
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return m_nac;
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}
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