117 lines
2.8 KiB
C++
117 lines
2.8 KiB
C++
/*
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* Copyright (C) 2018 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 "NXDNDefines.h"
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#include "NXDNLayer3.h"
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#include <cstdio>
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#include <cassert>
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#include <cstring>
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const unsigned char BIT_MASK_TABLE[] = { 0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02U, 0x01U };
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#define WRITE_BIT1(p,i,b) p[(i)>>3] = (b) ? (p[(i)>>3] | BIT_MASK_TABLE[(i)&7]) : (p[(i)>>3] & ~BIT_MASK_TABLE[(i)&7])
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#define READ_BIT1(p,i) (p[(i)>>3] & BIT_MASK_TABLE[(i)&7])
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CNXDNLayer3::CNXDNLayer3(const CNXDNLayer3& layer3) :
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m_data(NULL)
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{
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m_data = new unsigned char[22U];
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::memcpy(m_data, layer3.m_data, 22U);
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}
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CNXDNLayer3::CNXDNLayer3() :
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m_data(NULL)
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{
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m_data = new unsigned char[22U];
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::memset(m_data, 0x00U, 22U);
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}
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CNXDNLayer3::~CNXDNLayer3()
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{
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delete[] m_data;
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}
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void CNXDNLayer3::decode(const unsigned char* bytes, unsigned int length, unsigned int offset)
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{
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assert(bytes != NULL);
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for (unsigned int i = 0U; i < length; i++, offset++) {
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bool b = READ_BIT1(bytes, i);
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WRITE_BIT1(m_data, offset, b);
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}
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}
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void CNXDNLayer3::encode(unsigned char* bytes, unsigned int length, unsigned int offset)
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{
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assert(bytes != NULL);
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for (unsigned int i = 0U; i < length; i++, offset++) {
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bool b = READ_BIT1(m_data, i);
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WRITE_BIT1(bytes, offset, b);
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}
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}
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unsigned char CNXDNLayer3::getMessageType() const
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{
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return m_data[0U] & 0x3FU;
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}
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unsigned short CNXDNLayer3::getSourceUnitId() const
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{
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return (m_data[3U] << 8) | m_data[4U];
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}
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unsigned short CNXDNLayer3::getDestinationGroupId() const
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{
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return (m_data[5U] << 8) | m_data[6U];
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}
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bool CNXDNLayer3::getIsGroup() const
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{
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return (m_data[2U] & 0x80U) != 0x80U;
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}
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unsigned char CNXDNLayer3::getDataBlocks() const
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{
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return m_data[8U] & 0x0FU;
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}
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void CNXDNLayer3::getData(unsigned char* data) const
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{
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::memcpy(data, m_data, 22U);
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}
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void CNXDNLayer3::setData(const unsigned char* data, unsigned int length)
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{
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::memset(m_data, 0x00U, 22U);
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::memcpy(m_data, data, length);
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}
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void CNXDNLayer3::reset()
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{
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::memset(m_data, 0x00U, 22U);
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}
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CNXDNLayer3& CNXDNLayer3::operator=(const CNXDNLayer3& layer3)
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{
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if (&layer3 != this)
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::memcpy(m_data, layer3.m_data, 22U);
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return *this;
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}
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