MMDVMHost-Private/NXDNLayer3.cpp

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/*
* 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++) {
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bool b = READ_BIT1(bytes, i);
WRITE_BIT1(m_data, offset, b);
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}
}
void CNXDNLayer3::encode(unsigned char* bytes, unsigned int length, unsigned int offset)
{
assert(bytes != NULL);
for (unsigned int i = 0U; i < length; i++, offset++) {
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bool b = READ_BIT1(m_data, offset);
WRITE_BIT1(bytes, i, b);
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}
}
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);
}
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CNXDNLayer3& CNXDNLayer3::operator=(const CNXDNLayer3& layer3)
{
if (&layer3 != this)
::memcpy(m_data, layer3.m_data, 22U);
return *this;
}