MonsLib.cpp

/*
Code: Add new monsters to MuOnline client
Credits: DoS.Ninja
Web: ninja-researcher.blogspot.com
*/
#include "stdafx.h"
#include "MonsLib.h"
#include "Hook.h"

#define ADD_MOBS_COUNT 3
MonsterAdd_Struct s_AddMob[ADD_MOBS_COUNT]={
    {555, MONSTER_DIR, "Monster555"},
    {556, MONSTER_DIR, "Monster13"},
    {557, MONSTER_DIR, "Monster13"},
};
DWORD dwNewMobResInx[ADD_MOBS_COUNT];

#define MOBS_PARAMS_COUNT 4
MobParam_Struct s_ParamMob[MOBS_PARAMS_COUNT] = {
    {555, "New mob1", NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, 0},
    {556, "New mob2", 4, 5, 0, 0x057c, 1, 44, 0x0F81, 1, 22, 1},
    {557, "New mob3", 4, 1, 0, NONE, NULL, NULL, -1, NULL, NULL, 1.5},
    {24, "Worm Killer", 1, 7, NONE, NONE, NONE, NONE, NONE, NONE, NONE, 2}
};

DWORD dwModelResInx, dwModelMobsID, dwModelResSizeof, dwModelResCount;
int iTempMobID = NONE;

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
        Init_Monsters();
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}

void Init_Monsters() {
    DWORD dwResSize, dwResCount, dwTotalSize;

    // Get resource ID
    dwModelResSizeof = *(DWORD*)(OFFST_MODELRES_SIZEOF + 1);
    dwModelResCount = *(DWORD*)(OFFST_MODELRES_COUNT + 1);
    dwModelMobsID = *(DWORD*)(OFFST_MODELRES_MOBS_ID + 2);

    // Hook some proc for calc resource id
    HookAddress(HPROC_LOADPLAYERBMD, (DWORD)Hook_LoadPlayerBMD, NULL);

    // Hook zero-bull load
    HookAddress(HPROC_OPENMONSTERMODEL_BULL, (DWORD)Hook_OpenMonsterModel, NULL);
    memset((void*)(HARGS_BULL_PUSH), _asm_nop, 2);
    MEMORY1(HARGS_BULL_PUSH) = _asm_push_eax; // Change PUSH 0 to PUSH EAX

    // Hook construct zero-bull model
    HookAddress(HPROC_CONSTMONSTERMODEL_BULL, (DWORD)Hook_ConstructMonsterModel, NULL);

    // Fix load resurce id in OpenMonsterModel() HPROC_LOADBMDMODEL
    HookAddress(HPROC_LOADBMDMODEL, (DWORD)Hook_FixLoadBMDModel, NULL);

    //Hook set mob name style, for change mob params
    HookAddress(HPROC_SETMOBNAMESTYLE, (DWORD)Hook_SetMonsterNameStyle, NULL);

}

void __cdecl Hook_LoadPlayerBMD(DWORD dwResInx, LPSTR lpDir, LPSTR lpBaseName, DWORD Arg4){
// Hook procedure only for calc model resource indexes after heapalloc memory block
    DWORD dwEnd, dwDiff, dwSize;

    // calc model resource index
    dwSize = dwModelResSizeof * dwModelResCount;
    dwDiff = *lpModelResArray - *lpModelResBase;
    dwModelResInx = (dwSize - dwDiff) / dwModelResSizeof;

    // set resource index for new monsters
    for(int i=0;i<ADD_MOBS_COUNT;i++) {
        dwNewMobResInx[i] = dwModelResInx - i - 1;
        s_AddMob[i].dwMobID -= 1;//fix, LoadModel(mob_id) where mob_id = server_mob_id - 1
    }

    //back to load player.bmd
    HLoadBMDModel(dwResInx, lpDir, lpBaseName, Arg4);//original
}

void __cdecl Hook_OpenMonsterModel(DWORD dwMobNumber) {
// Change zero-bull to new mob (if need)
    if(dwMobNumber != -1)// if not zero-bull
    {
        for(int i=0;i<ADD_MOBS_COUNT;i++) {
            if(dwMobNumber == s_AddMob[i].dwMobID) {
                dwMobNumber = dwNewMobResInx[i] - dwModelMobsID;
                iTempMobID = i;
                break;
            }
        }
    }
    else
        dwMobNumber=0;

    HOpenMonsterModel(dwMobNumber);//original
}

void __cdecl Hook_FixLoadBMDModel(DWORD dwResInx, LPSTR lpDir, LPSTR lpBaseName, DWORD Arg4){
// Change load bmd model params (if need)
    if(iTempMobID != NONE){
        lpDir = s_AddMob[iTempMobID].lpDir;
        lpBaseName = s_AddMob[iTempMobID].lpFile;
        Arg4 = -1;
    }

    HLoadBMDModel(dwResInx, lpDir, lpBaseName, Arg4);//original
}

DWORD __cdecl Hook_ConstructMonsterModel(DWORD Arg1, DWORD dwResInx, DWORD dwResOffst, DWORD Arg4, DWORD Arg5){
// Change new resource ID (if need)
    if(iTempMobID != NONE){
        dwResInx = dwNewMobResInx[iTempMobID];
        iTempMobID = NONE;
    }

    return HConstructMonsterModel(Arg1, dwResInx, dwResOffst, Arg4, Arg5);//original
}

void __cdecl Hook_SetMonsterNameStyle(DWORD dwMemAddr, DWORD dwMobID, DWORD Arg3, DWORD Arg4){
// Hook for change monster parametres
    HSetMonsterNameStyle(dwMemAddr, dwMobID, Arg3, Arg4);//original
    ModifMonsParams(dwMemAddr, dwMobID);
}

void ModifMonsParams(DWORD lpUnit, DWORD dwMobID){

    for(int i=0;i<MOBS_PARAMS_COUNT;i++)
    {
        if(s_ParamMob[i].dwMobID==dwMobID)
        {
            Unit_Struct *pUnit;
            pUnit = (Unit_Struct*)lpUnit;

            if(s_ParamMob[i].lpName!=NULL)
                sprintf(pUnit->cName, "%s", s_ParamMob[i].lpName);

            if(s_ParamMob[i].bMoveOut != NONE)
                pUnit->bMoveOut = s_ParamMob[i].bMoveOut;

            if(s_ParamMob[i].bMobType!=NONE)
                pUnit->bMobType = s_ParamMob[i].bMobType;

            if(s_ParamMob[i].fSize!=NULL)
                pUnit->fSize = s_ParamMob[i].fSize;

            if(s_ParamMob[i].bPKStatus!=NONE)
                pUnit->bPKStatus = s_ParamMob[i].bPKStatus;

            //Hand first
            if(s_ParamMob[i].sItem1ResID!=NONE)
                pUnit->sItem1ResID = s_ParamMob[i].sItem1ResID;

            if(s_ParamMob[i].bItem1IsExcl!=NONE)
                pUnit->bItem1IsExc = s_ParamMob[i].bItem1IsExcl;

            if(s_ParamMob[i].bItem1JoinID!=NONE)
                pUnit->bItem1JoinID = s_ParamMob[i].bItem1JoinID;

            //Hand second
            if(s_ParamMob[i].sItem2ResID!=NONE)
                pUnit->sItem2ResID = s_ParamMob[i].sItem2ResID;

            if(s_ParamMob[i].bItem2IsExcl!=NONE)
                pUnit->bItem2IsExc = s_ParamMob[i].bItem2IsExcl;

            if(s_ParamMob[i].bItem2JoinID!=NONE)
                pUnit->bItem2JoinID = s_ParamMob[i].bItem2JoinID;

        }
    }
}