/**

* @file PacketBuild.h

* @brief 组包模块头文件

* Copyright(c) 2007,上海第九城市游戏研发部

* All rights reserved

* 文件名称: PacketBuild.h

* 摘    要: 根据通信协议（类型，命令字，协议结构）进行组包

* 作    者: dzj

* 完成日期: 2007.12.04

*

*/



#pragma once



#include "CliProtocol.h"

static const unsigned char SELF_PROTO_TYPE = 0x00;//自身为客户端，定义见srvProtocol.h;

static const int PKGBUILD_BUF_SIZE = MUX_PROTO::MAX_MSG_SIZE;//不要随意改动此值，因为底层网络模块的缓冲也有限制，只改动这一个值可能导致底层错误；



/**

组包类，将待发信息加上包头

注意：应在单线程中使用，并且每次新组包会覆盖旧包，因此每次的组包都应即时发送出去；

*/

class CPacketBuild

{

public:

	//组包函数；

	template < typename T_Msg >

	static bool CreatePkg( T_Msg* pPkg, char** pOutPkg, int& nOutLen ) 

	{

		//if ( pPkg->wCmd != T_Msg::wCmd )

		//{

		//	return false;

		//}



		//unsigned short wPkgLen = sizeof(T_Msg) + 5;//包头字段长度为sizeof(WORD)(wPkgLen)+sizeof(BYTE)(byPkgType)+sizeof(WORD)(wCmd) = 5;

		//if ( wPkgLen >= PKGBUILD_BUF_SIZE )

		//{

		//	nOutLen = 0;

		//	*pOutPkg = NULL;

		//	return false;

		//}

		//unsigned char byPkgType = T_Msg::byPkgType;

		//unsigned short wCmd = pPkg->wCmd;

		//memcpy( &(m_InnerBuf[0]), &wPkgLen, 2 );//包长：wPkgLen;

		//memcpy( &(m_InnerBuf[2]), &byPkgType, 1 );//包类型：byPkgType;

		//memcpy( &(m_InnerBuf[3]), &wCmd, 2 );//命令字：wCmd;

		//memcpy( &(m_InnerBuf[5]), pPkg, sizeof(T_Msg) );//包内容；

 

		//nOutLen = (int)wPkgLen;

		//*pOutPkg = (char*)m_InnerBuf;

		//return true; 



		// 使用协议工具2008.7.15

		if ( pPkg->wCmd != T_Msg::wCmd )

		{

			nOutLen = 0;

			*pOutPkg = NULL;

			return false;

		}



		if (sizeof(T_Msg) > (PKGBUILD_BUF_SIZE - 5))

		{

			//D_ERROR( "CPacketBuild::CreatePkg，欲发包的包长超过了MsgToPut的内部缓存大小，包类型%x", T_Msg::wCmd );

			return NULL;

		}



		int iEnLen = (int)m_clipro.EnCode(pPkg->wCmd, pPkg, &(m_InnerBuf[5]), sizeof(m_InnerBuf) - 5);

		if(iEnLen == -1)

		{

			//D_ERROR( "CPacketBuild::CreatePkg，EnCode失败，包类型%x", T_Msg::wCmd );

			nOutLen = 0;

			*pOutPkg = NULL;

			return false;

		}



		unsigned char byPkgType = 0;

		unsigned short wCmd = pPkg->wCmd;

		unsigned short wPkgLen = iEnLen + 5;



		memcpy( &(m_InnerBuf[0]), &wPkgLen, 2 );//包长：wPkgLen;

		memcpy( &(m_InnerBuf[2]), &byPkgType, 1 );//包类型：byPkgType;

		memcpy( &(m_InnerBuf[3]), &wCmd, 2 );//命令字：wCmd;

#ifdef CHECK_ENDIAN

		if ( g_isBigEndian )

		{

			unsigned short wLECmd = ENDIAN_CHANGE_S(wCmd);

			unsigned short wLEPkgLen = ENDIAN_CHANGE_S(wPkgLen);

			memcpy( &(m_InnerBuf[0]), &wLEPkgLen, 2 );//包长：wPkgLen;

			memcpy( &(m_InnerBuf[2]), &byPkgType, 1 );//包类型：byPkgType;

			memcpy( &(m_InnerBuf[3]), &wLECmd, 2 );//命令字：wCmd;

		}

#endif //CHECK_ENDIAN



		nOutLen = (int)wPkgLen;

		*pOutPkg = (char*)m_InnerBuf;

		return true; 

	};



private:

	static char m_InnerBuf[PKGBUILD_BUF_SIZE];



	// 使用协议工具2008.7.15

	static CliProtocol m_clipro;

};



class CPacketBuildNetTrd //网络线程中组包类

{

public:

	//组包函数；

	template < typename T_Msg >

	bool CreateNetTrdPkg( T_Msg* pPkg, char** pOutPkg, int& nOutLen ) 

	{

		// 使用协议工具2008.7.15

		if ( pPkg->wCmd != T_Msg::wCmd )

		{

			nOutLen = 0;

			*pOutPkg = NULL;

			return false;

		}



		if (sizeof(T_Msg) > (PKGBUILD_BUF_SIZE - 5))

		{

			//D_ERROR( "CPacketBuild::CreatePkg，欲发包的包长超过了MsgToPut的内部缓存大小，包类型%x", T_Msg::wCmd );

			return NULL;

		}



		int iEnLen = (int)m_clipro.EnCode(pPkg->wCmd, pPkg, &(m_InnerBuf[5]), sizeof(m_InnerBuf) - 5);

		if(iEnLen == -1)

		{

			//D_ERROR( "CPacketBuild::CreatePkg，EnCode失败，包类型%x", T_Msg::wCmd );

			nOutLen = 0;

			*pOutPkg = NULL;

			return false;

		}



		unsigned char byPkgType = 0;

		unsigned short wCmd = pPkg->wCmd;

		unsigned short wPkgLen = iEnLen + 5;



		memcpy( &(m_InnerBuf[0]), &wPkgLen, 2 );//包长：wPkgLen;

		memcpy( &(m_InnerBuf[2]), &byPkgType, 1 );//包类型：byPkgType;

		memcpy( &(m_InnerBuf[3]), &wCmd, 2 );//命令字：wCmd;

#ifdef CHECK_ENDIAN

		if ( g_isBigEndian )

		{

			unsigned short wLECmd = ENDIAN_CHANGE_S(wCmd);

			unsigned short wLEPkgLen = ENDIAN_CHANGE_S(wPkgLen);

			memcpy( &(m_InnerBuf[0]), &wLEPkgLen, 2 );//包长：wPkgLen;

			memcpy( &(m_InnerBuf[2]), &byPkgType, 1 );//包类型：byPkgType;

			memcpy( &(m_InnerBuf[3]), &wLECmd, 2 );//命令字：wCmd;

		}

#endif //CHECK_ENDIAN



		nOutLen = (int)wPkgLen;

		*pOutPkg = (char*)m_InnerBuf;

		return true; 

	};



private:

	char m_InnerBuf[PKGBUILD_BUF_SIZE];



	CliProtocol m_clipro;

};