Major plugin refactor and cleanup.

Switched to POCO library for unified platform/library interface.
Deprecated the external module API. It was creating more problems than solving.
Removed most built-in libraries in favor of system libraries for easier maintenance.
Cleaned and secured code with help from static analyzers.

vendor/POCO/Net/src/ICMPPacketImpl.cpp

@@ -0,0 +1,104 @@
+//
+// ICMPPacketImpl.cpp
+//
+// 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  = 65535;
+const UInt16 ICMPPacketImpl::MAX_PAYLOAD_SIZE = 65507;
+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