118 lines
2.8 KiB
C++
118 lines
2.8 KiB
C++
/*
|
|
* Copyright (C) 2018 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 "NXDNDefines.h"
|
|
#include "NXDNLayer3.h"
|
|
|
|
#include <cstdio>
|
|
#include <cassert>
|
|
#include <cstring>
|
|
|
|
const unsigned char BIT_MASK_TABLE[] = { 0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02U, 0x01U };
|
|
|
|
#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])
|
|
#define READ_BIT1(p,i) (p[(i)>>3] & BIT_MASK_TABLE[(i)&7])
|
|
|
|
CNXDNLayer3::CNXDNLayer3(const CNXDNLayer3& layer3) :
|
|
m_data(NULL)
|
|
{
|
|
m_data = new unsigned char[22U];
|
|
::memcpy(m_data, layer3.m_data, 22U);
|
|
}
|
|
|
|
CNXDNLayer3::CNXDNLayer3() :
|
|
m_data(NULL)
|
|
{
|
|
m_data = new unsigned char[22U];
|
|
::memset(m_data, 0x00U, 22U);
|
|
}
|
|
|
|
CNXDNLayer3::~CNXDNLayer3()
|
|
{
|
|
delete[] m_data;
|
|
}
|
|
|
|
void CNXDNLayer3::decode(const unsigned char* bytes, unsigned int length, unsigned int offset)
|
|
{
|
|
assert(bytes != NULL);
|
|
|
|
for (unsigned int i = 0U; i < length; i++, offset++) {
|
|
bool b = READ_BIT1(bytes, i);
|
|
WRITE_BIT1(m_data, offset, b);
|
|
}
|
|
}
|
|
|
|
void CNXDNLayer3::encode(unsigned char* bytes, unsigned int length, unsigned int offset)
|
|
{
|
|
assert(bytes != NULL);
|
|
|
|
for (unsigned int i = 0U; i < length; i++, offset++) {
|
|
bool b = READ_BIT1(m_data, offset);
|
|
WRITE_BIT1(bytes, i, b);
|
|
}
|
|
}
|
|
|
|
unsigned char CNXDNLayer3::getMessageType() const
|
|
{
|
|
return m_data[0U] & 0x3FU;
|
|
}
|
|
|
|
unsigned short CNXDNLayer3::getSourceUnitId() const
|
|
{
|
|
return (m_data[3U] << 8) | m_data[4U];
|
|
}
|
|
|
|
unsigned short CNXDNLayer3::getDestinationGroupId() const
|
|
{
|
|
return (m_data[5U] << 8) | m_data[6U];
|
|
}
|
|
|
|
bool CNXDNLayer3::getIsGroup() const
|
|
{
|
|
return (m_data[2U] & 0x80U) != 0x80U;
|
|
}
|
|
|
|
unsigned char CNXDNLayer3::getDataBlocks() const
|
|
{
|
|
return (m_data[8U] & 0x0FU) + 1U;
|
|
}
|
|
|
|
void CNXDNLayer3::getData(unsigned char* data) const
|
|
{
|
|
::memcpy(data, m_data, 22U);
|
|
}
|
|
|
|
void CNXDNLayer3::setData(const unsigned char* data, unsigned int length)
|
|
{
|
|
::memset(m_data, 0x00U, 22U);
|
|
::memcpy(m_data, data, length);
|
|
}
|
|
|
|
void CNXDNLayer3::reset()
|
|
{
|
|
::memset(m_data, 0x00U, 22U);
|
|
}
|
|
|
|
CNXDNLayer3& CNXDNLayer3::operator=(const CNXDNLayer3& layer3)
|
|
{
|
|
if (&layer3 != this)
|
|
::memcpy(m_data, layer3.m_data, 22U);
|
|
|
|
return *this;
|
|
}
|