在一个空间中寻找与给定地址范围重合或部分重合的（已分配）区间
PMEMORY_AREA NTAPI MmLocateMemoryAreaByRegion(
PMADDRESS_SPACE AddressSpace,
PVOID Address,
ULONG_PTR Length
);
MmLocateMemoryAreaByRegion
/***************************************************************************************/
//在一个空间中寻找与给定地址范围重合或部分重合的（已分配）区间
PMEMORY_AREA STDCALL MmLocateMemoryAreaByRegion(PMADDRESS_SPACE AddressSpace,PVOID Address, ULONG_PTR Length)
{ PMEMORY_AREA Node;PVOID Extent = (PVOIDK(ULONG_PTR)Address + Length);//地址范围的终点MmVerifyMemoryAreas(AddressSpace);//检测该AVL树是否存在问题/*Special ease for empty tree.*/if (AddressSpace->MemoryAreaBoot == NULL)return NULL;/* Traverse the tree from left to right.*/for (Node = MmIterateFirstNode(AddressSpace->MemoryAreaRoot);Node!= NULL;Node = MmIterateNextNode(Node)){if (Node->StartingAddress >= Address && Node->StartingAddress < Extent)return Node;//部分重合，区间的起点落在给定范围之内if (Node->EndingAddress > Address && Node->EndingAddress < Extent)return Node;//部分重合，区间的终点落在给定范围之内if (Node->StartingAddress <= Address && Node->EndingAddress >= Extent)return Node;//全部重合，给定范围落在区间之内if(Node->StartingAddress >= Extent)return NULL;
} //end for
return NULL;
}c
