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//
// ICMPPacketImpl.cpp
//
// $Id: //poco/1.4/Net/src/ICMPPacketImpl.cpp#2 $
//
// Library: Net
// Package: ICMP
// Module: ICMPPacketImpl
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//


#include "Poco/Net/ICMPPacketImpl.h"
#include "Poco/Net/NetException.h"
#include "Poco/Timestamp.h"
#include "Poco/Timespan.h"
#include "Poco/NumberFormatter.h"
#include <sstream>


using Poco::InvalidArgumentException;
using Poco::Timestamp;
using Poco::Timespan;
using Poco::NumberFormatter;
using Poco::UInt8;
using Poco::UInt16;
using Poco::Int32;


namespace Poco {
namespace Net {


const UInt16 ICMPPacketImpl::MAX_PACKET_SIZE = 4096;
const UInt16 ICMPPacketImpl::MAX_SEQ_VALUE = 65535;


ICMPPacketImpl::ICMPPacketImpl(int dataSize):
_seq(0),
_pPacket(new UInt8[MAX_PACKET_SIZE]),
_dataSize(dataSize)
{
if (_dataSize > MAX_PACKET_SIZE)
throw InvalidArgumentException("Packet size must be <= " + NumberFormatter::format(MAX_PACKET_SIZE));
}


ICMPPacketImpl::~ICMPPacketImpl()
{
delete [] _pPacket;
}


void ICMPPacketImpl::setDataSize(int dataSize)
{
_dataSize = dataSize;
initPacket();
}


int ICMPPacketImpl::getDataSize() const
{
return _dataSize;
}


const Poco::UInt8* ICMPPacketImpl::packet(bool init)
{
if (init) initPacket();
return _pPacket;
}


unsigned short ICMPPacketImpl::checksum(UInt16 *addr, Int32 len)
{
Int32 nleft = len;
UInt16* w = addr;
UInt16 answer;
Int32 sum = 0;

while (nleft > 1)
{
sum += *w++;
nleft -= sizeof(UInt16);
}

if (nleft == 1)
{
UInt16 u = 0;
*(UInt8*) (&u) = *(UInt8*) w;
sum += u;
}

sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16);
answer = ~sum;
return answer;
}


} } // namespace Poco::Net
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