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+//
+// ICMPPacketImpl.h
+//
+// Library: Net
+// Package: ICMP
+// Module:  ICMPPacketImpl
+//
+// Definition of the ICMPPacketImpl class.
+//
+// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Net_ICMPPacketImpl_INCLUDED
+#define Net_ICMPPacketImpl_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/Net/Socket.h"
+
+
+namespace Poco {
+namespace Net {
+
+
+class Net_API ICMPPacketImpl
+	/// This is the abstract class for ICMP packet implementations.
+{
+public:
+	ICMPPacketImpl(int dataSize = 48);
+		/// Constructor. Creates an ICMPPacketImpl.
+
+	virtual ~ICMPPacketImpl();
+		/// Destructor.
+
+	const Poco::UInt8* packet(bool init = true);
+		/// Returns raw ICMP packet.
+		/// ICMP header and data are included in the packet.
+		/// If init is true, initPacket() is called.
+
+	virtual int packetSize() const = 0;
+		/// Returns the total size of packet (ICMP header + data) in number of octets.
+		/// Must be overriden.
+
+	virtual int maxPacketSize() const;
+		/// Returns the maximum permitted size of packet in number of octets.
+
+	Poco::UInt16 sequence() const;
+		/// Returns the most recent sequence number generated.
+
+	void setDataSize(int dataSize);
+		/// Sets data size.
+
+	int getDataSize() const;
+		/// Returns data size.
+
+	virtual struct timeval time(Poco::UInt8* buffer = 0, int length = 0) const = 0;
+		/// Returns current epoch time if either argument is equal to zero.
+		/// Otherwise, it extracts the time value from the supplied buffer.
+		/// 
+		/// Supplied buffer includes IP header, ICMP header and data.
+		/// Must be overriden.
+
+	virtual bool validReplyID(unsigned char* buffer, int length) const = 0;
+		/// Returns true if the extracted id is recognized 
+		/// (i.e. equals the process id).
+		///	
+		/// Supplied buffer includes IP header, ICMP header and data.
+		/// Must be overriden.
+
+	virtual std::string errorDescription(Poco::UInt8* buffer, int length) = 0;
+		/// Returns error description string.
+		/// If supplied buffer contains an ICMP echo reply packet, an
+		/// empty string is returned indicating the absence of error.
+		///	
+		/// Supplied buffer includes IP header, ICMP header and data.
+		/// Must be overriden.
+
+	virtual std::string typeDescription(int typeId) = 0;
+		/// Returns the description of the packet type.
+		/// Must be overriden.
+
+	static const Poco::UInt16 MAX_PACKET_SIZE;
+	static const Poco::UInt16 MAX_SEQ_VALUE;
+
+protected:
+	Poco::UInt16 nextSequence();
+		/// Increments sequence number and returns the new value.
+
+	void resetSequence();
+		/// Resets the sequence to zero.
+
+	virtual void initPacket() = 0;
+		/// (Re)assembles the packet.
+		/// Must be overriden.
+
+	Poco::UInt16 checksum(Poco::UInt16 *addr, Poco::Int32 len);
+		/// Calculates the checksum for supplied buffer.
+
+private:
+	Poco::UInt16 _seq;
+	Poco::UInt8* _pPacket;
+	int _dataSize;
+	
+};
+
+
+//
+// inlines
+//
+inline Poco::UInt16 ICMPPacketImpl::sequence() const
+{
+	return _seq;
+}
+
+
+inline Poco::UInt16 ICMPPacketImpl::nextSequence()
+{
+	return ++_seq;
+}
+
+
+inline void ICMPPacketImpl::resetSequence()
+{
+	_seq = 0;
+}
+
+
+inline int ICMPPacketImpl::maxPacketSize() const
+{
+	return MAX_PACKET_SIZE;
+}
+
+
+} } // namespace Poco::Net
+
+
+#endif // Net_ICMPPacketImpl_INCLUDED