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108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
#pragma once
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typedef struct _WIN32HEAP WIN32HEAP, *PWIN32HEAP;
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/*
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typedef struct _W32HEAP_USER_MAPPING
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{
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struct _W32HEAP_USER_MAPPING* Next;
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PVOID KernelMapping;
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PVOID UserMapping;
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ULONG_PTR Limit;
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ULONG Count;
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} W32HEAP_USER_MAPPING, *PW32HEAP_USER_MAPPING;
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*/
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/* User heap */
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extern HANDLE GlobalUserHeap;
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extern PVOID GlobalUserHeapSection;
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PWIN32HEAP
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UserCreateHeap(OUT PVOID *SectionObject,
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IN OUT PVOID *SystemBase,
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IN SIZE_T HeapSize);
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NTSTATUS
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UnmapGlobalUserHeap(IN PEPROCESS Process);
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NTSTATUS
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MapGlobalUserHeap(IN PEPROCESS Process,
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OUT PVOID* KernelMapping,
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OUT PVOID* UserMapping);
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static __inline PVOID
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UserHeapAlloc(SIZE_T Bytes)
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{
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/* User heap has no lock, using global user lock instead. */
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ASSERT(UserIsEnteredExclusive());
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return RtlAllocateHeap(GlobalUserHeap,
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HEAP_NO_SERIALIZE,
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Bytes);
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}
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static __inline BOOL
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UserHeapFree(PVOID lpMem)
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{
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/* User heap has no lock, using global user lock instead. */
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ASSERT(UserIsEnteredExclusive());
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return RtlFreeHeap(GlobalUserHeap,
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HEAP_NO_SERIALIZE,
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lpMem);
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}
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static __inline PVOID
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UserHeapReAlloc(PVOID lpMem,
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SIZE_T Bytes)
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{
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#if 0
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/* NOTE: ntoskrnl doesn't export RtlReAllocateHeap... */
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return RtlReAllocateHeap(GlobalUserHeap,
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HEAP_NO_SERIALIZE,
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lpMem,
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Bytes);
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#else
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SIZE_T PrevSize;
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PVOID pNew;
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/* User heap has no lock, using global user lock instead. */
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ASSERT(UserIsEnteredExclusive());
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PrevSize = RtlSizeHeap(GlobalUserHeap,
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HEAP_NO_SERIALIZE,
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lpMem);
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if (PrevSize == Bytes)
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return lpMem;
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pNew = RtlAllocateHeap(GlobalUserHeap,
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HEAP_NO_SERIALIZE,
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Bytes);
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if (pNew != NULL)
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{
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if (PrevSize < Bytes)
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Bytes = PrevSize;
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RtlCopyMemory(pNew,
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lpMem,
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Bytes);
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RtlFreeHeap(GlobalUserHeap,
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HEAP_NO_SERIALIZE,
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lpMem);
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}
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return pNew;
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#endif
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}
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static __inline PVOID
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UserHeapAddressToUser(PVOID lpMem)
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{
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PPROCESSINFO W32Process = PsGetCurrentProcessWin32Process();
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/* The first mapping entry is the global user heap mapping */
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return (PVOID)(((ULONG_PTR)lpMem - (ULONG_PTR)GlobalUserHeap) +
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(ULONG_PTR)W32Process->HeapMappings.UserMapping);
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}
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/* EOF */
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