bullet impact dehook

CPedSAInterface*    pBulletImpactInitiator;
CEntitySAInterface* pBulletImpactVictim;
CVector*            pBulletImpactStartPosition;
CVector*            pBulletImpactEndPosition;
void Aim() {
    struct cactor_info *localped = (struct cactor_info *)(UINT_PTR) * (uint32_t *)ACTOR_POINTER_SELF;
    if (localped) {
        GetClosestCrosshairTarget(&hd.last_ped, hd.WEAPON_SETTINGS[getScriptCurrentWeaponName(localped)].FOV);
        struct cactor_info *ped = (cactor_info*)hd.last_ped;
        if (ped) {
            if (ped == localped) return; //ped self

            CVector myPos;
            ULONG readed;
            myPos = *(CVector*)(0xB6F258 + 0xE0);
            CVector target_bone;
            switch (hd.WEAPON_SETTINGS[getScriptCurrentWeaponName(localped)].BODY_PART) {
                case eAimTar::HEAD:
                    GetBonePosition((CPed*)ped, &target_bone, eBone::BONE_HEAD);
                    break;
                case eAimTar::BODY:
                    GetBonePosition((CPed*)ped, &target_bone, eBone::BONE_SPINE1);
                    break;
                case eAimTar::AUTO:
                    if (ped->state == 50) //driving
                        GetBonePosition((CPed*)ped, &target_bone, eBone::BONE_HEAD);
                    else
                        GetBonePosition((CPed*)ped, &target_bone, eBone::BONE_SPINE1);
                    break;
                }
            target_bone.fZ += 0.03219923;
            //so we have target bone, and now we need CEntitySAInteface...
            *(DWORD*)&pBulletImpactInitiator = (DWORD)localped;
            *(DWORD*)&pBulletImpactVictim = (DWORD)ped;
            pBulletImpactEndPosition = new CVector(target_bone);
        }
    }
}

#define HOOKPOS_CWeapon_DoBulletImpact                  0x73B550
DWORD MTAHookAddr;
DWORD MTADelta;

void _declspec(naked) BulletImpactHook() {
    _asm
    {
        mov     eax, [esp + 4]
        mov     pBulletImpactInitiator, eax
        mov     eax, [esp + 8]
        mov     pBulletImpactVictim, eax
        mov     eax, [esp + 12]
        mov     pBulletImpactStartPosition, eax
        mov     eax, [esp + 16]
        mov     pBulletImpactEndPosition, eax
        pushad
    }
    //some actions if need
    Aim();
    _asm
    {
        popad
        push    0xFFFFFFFF
        push    0x00848E50
        jmp     MTAHookAddr
    }
}

void SetupBulletImpactHook() {
    //we need to change mta inline hook, namely - jmp delta
    if (*(BYTE*)(HOOKPOS_CWeapon_DoBulletImpact) == 0xE9) {
        MTADelta = *(DWORD*)(HOOKPOS_CWeapon_DoBulletImpact + 1);
        MTAHookAddr = *(DWORD*)(HOOKPOS_CWeapon_DoBulletImpact + 1) + HOOKPOS_CWeapon_DoBulletImpact; //save it for subsequent jump
        *(DWORD*)(HOOKPOS_CWeapon_DoBulletImpact + 1) = (DWORD)&BulletImpactHook - (HOOKPOS_CWeapon_DoBulletImpact + 5);
    }
}
void RemoveBulletImpactHook() {
    *(DWORD*)(HOOKPOS_CWeapon_DoBulletImpact + 1) = MTADelta;
}