Layer.h

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#ifndef PACKETPP_LAYER
#define PACKETPP_LAYER

#include <stdint.h>
#include <stdio.h>
#include "ProtocolType.h"
#include <string>


namespace pcpp
{

    class IDataContainer
    {
    public:
        virtual uint8_t* getDataPtr(size_t offset = 0) const = 0;

        virtual ~IDataContainer() {}
    };

    class Packet;

    class Layer : public IDataContainer {
        friend class Packet;
    public:
        virtual ~Layer();

        Layer* getNextLayer() const { return m_NextLayer; }

        Layer* getPrevLayer() const { return m_PrevLayer; }

        ProtocolType getProtocol() const { return m_Protocol; }

        uint8_t* getData() const { return m_Data; }

        size_t getDataLen() const { return m_DataLen; }

        uint8_t* getLayerPayload() const { return m_Data + getHeaderLen(); }

        size_t getLayerPayloadSize() const { return m_DataLen - getHeaderLen(); }

        bool isAllocatedToPacket() const { return m_Packet != NULL; }

        void copyData(uint8_t* toArr) const;


        // implement abstract methods

        uint8_t* getDataPtr(size_t offset = 0) const { return (uint8_t*)(m_Data + offset); }


        // abstract methods

        virtual void parseNextLayer() = 0;

        virtual size_t getHeaderLen() const = 0;

        virtual void computeCalculateFields() = 0;

        virtual std::string toString() const = 0;

        virtual OsiModelLayer getOsiModelLayer() const = 0;

    protected:
        uint8_t* m_Data;
        size_t m_DataLen;
        Packet* m_Packet;
        ProtocolType m_Protocol;
        Layer* m_NextLayer;
        Layer* m_PrevLayer;
        bool m_IsAllocatedInPacket;

        Layer() : m_Data(NULL), m_DataLen(0), m_Packet(NULL), m_Protocol(UnknownProtocol), m_NextLayer(NULL), m_PrevLayer(NULL), m_IsAllocatedInPacket(false) { }

        Layer(uint8_t* data, size_t dataLen, Layer* prevLayer, Packet* packet) :
            m_Data(data), m_DataLen(dataLen),
            m_Packet(packet), m_Protocol(UnknownProtocol),
            m_NextLayer(NULL), m_PrevLayer(prevLayer), m_IsAllocatedInPacket(false) {}

        // Copy c'tor
        Layer(const Layer& other);
        Layer& operator=(const Layer& other);

        void setNextLayer(Layer* nextLayer) { m_NextLayer = nextLayer; }
        void setPrevLayer(Layer* prevLayer) { m_PrevLayer = prevLayer; }

        virtual bool extendLayer(int offsetInLayer, size_t numOfBytesToExtend);
        virtual bool shortenLayer(int offsetInLayer, size_t numOfBytesToShorten);
    };

} // namespace pcpp

#endif /* PACKETPP_LAYER */