#pragma once
#include <map>
#include <vector>
#include <string>

#include "MsgQueue.h"
#include "DiosLock.h"

using namespace std;

#define LOW_REQUEST_SIZE (-1)

class Packet_CB
{
public:
	Packet_CB()
	{
		m_Offset = 0;
		m_PacketSize = 0;
	};

	Packet_CB(DWORD offset,DWORD size)
	{
		m_PacketSize = size;
		m_Offset = offset;
	};

	~Packet_CB()
	{

	};

	DWORD m_PacketSize;
	DWORD m_Offset;

};

class CircleBuff : public DiosLock
{
protected:
	char *m_pBuff;
	DWORD m_TotalSize;
	DWORD m_UsedSize;
	DWORD m_BasePos;
	DWORD m_HeadPos;

	DWORD m_Limit;

	MsgQueue<Packet_CB> m_PacketQue;

	DWORD PushBlock(const char *pContext, DWORD Size);

public:

	CircleBuff();
	virtual ~CircleBuff();


	//初期设置，后续Push中有自动调整
	bool ReSetBuffSize(DWORD Size);

	//可能需要设置BUFF最大Limit,不然有可能内存吃冒了.
	void SetBuffMaxLimit(DWORD limit);//缺省32M在构造中

	//压入一个包,RAW+Size
	//返回压入包的大小,返回0：要么是Size零，要么是没内存了.
	DWORD Push(const char *pContext, DWORD Size);

	//读一个包，RAW+Size
	//返回包的大小,返回0意味着无包，返回-1意味着读包缓存太小
	int Pop(char *pContext, DWORD ContextSize);

	DWORD GetPacketCount();//读取剩余包的个数

	DWORD GetFrontPacketSize();//读取要Pop的包大小,返回0：无包

	//int CopyTransfer(CircleBuff &org);//copy org -> this.返回复制个数,负数返回失败

	HANDLE GetNotifyHandle();

};