00001 #ifndef _MSG_H
00002 #define _MSG_H
00003 
00004 #include "MPacket.h"
00005 
00006 
00007 #define MSGID_REPLYCONNECT  10
00008 #define MSGID_COMMAND       100
00009 
00010 
00011 #pragma pack(1)
00012 
00013 struct MReplyConnectMsg : public MPacketHeader
00014 {
00015     unsigned int    nHostHigh;
00016     unsigned int    nHostLow;
00017     unsigned int    nAllocHigh;
00018     unsigned int    nAllocLow;
00019 };
00020 
00021 struct MCommandMsg : public MPacketHeader
00022 {
00023     char    Buffer[1];
00024 };
00025 
00026 #pragma pack()
00027 
00028 
00029 // Tiny CheckSum for MCommandMsg
00030 inline unsigned short MBuildCheckSum(MPacketHeader* pPacket)
00031 {
00032     int nStartOffset = sizeof(MPacketHeader);
00033     BYTE* pBulk = (BYTE*)pPacket;
00034     int nBulkSize = pPacket->nSize - sizeof(MPacketHeader);
00035     unsigned long nCheckSum = 0;
00036     for (int i=nStartOffset; i<nBulkSize; i++) {
00037         nCheckSum += pBulk[i];
00038     }
00039     nCheckSum += pBulk[0]+pBulk[1]+pBulk[2]+pBulk[3];
00040     unsigned short nShortCheckSum = HIWORD(nCheckSum) + LOWORD(nCheckSum);
00041     return nShortCheckSum;
00042 }
00043 
00044 
00045 #endif