reactos/win32ss/user/ntuser/usrheap.h

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#pragma once
typedef struct _WIN32HEAP WIN32HEAP, *PWIN32HEAP;
/*
typedef struct _W32HEAP_USER_MAPPING
{
struct _W32HEAP_USER_MAPPING* Next;
PVOID KernelMapping;
PVOID UserMapping;
ULONG_PTR Limit;
ULONG Count;
} W32HEAP_USER_MAPPING, *PW32HEAP_USER_MAPPING;
*/
/* User heap */
extern HANDLE GlobalUserHeap;
extern PVOID GlobalUserHeapSection;
PWIN32HEAP
UserCreateHeap(OUT PVOID *SectionObject,
IN OUT PVOID *SystemBase,
IN SIZE_T HeapSize);
NTSTATUS
UnmapGlobalUserHeap(IN PEPROCESS Process);
NTSTATUS
MapGlobalUserHeap(IN PEPROCESS Process,
OUT PVOID* KernelMapping,
OUT PVOID* UserMapping);
static __inline PVOID
UserHeapAlloc(SIZE_T Bytes)
{
return RtlAllocateHeap(GlobalUserHeap,
HEAP_NO_SERIALIZE,
Bytes);
}
static __inline BOOL
UserHeapFree(PVOID lpMem)
{
return RtlFreeHeap(GlobalUserHeap,
HEAP_NO_SERIALIZE,
lpMem);
}
static __inline PVOID
UserHeapReAlloc(PVOID lpMem,
SIZE_T Bytes)
{
#if 0
/* NOTE: ntoskrnl doesn't export RtlReAllocateHeap... */
return RtlReAllocateHeap(GlobalUserHeap,
HEAP_NO_SERIALIZE,
lpMem,
Bytes);
#else
SIZE_T PrevSize;
PVOID pNew;
PrevSize = RtlSizeHeap(GlobalUserHeap,
HEAP_NO_SERIALIZE,
lpMem);
if (PrevSize == Bytes)
return lpMem;
pNew = RtlAllocateHeap(GlobalUserHeap,
HEAP_NO_SERIALIZE,
Bytes);
if (pNew != NULL)
{
if (PrevSize < Bytes)
Bytes = PrevSize;
RtlCopyMemory(pNew,
lpMem,
Bytes);
RtlFreeHeap(GlobalUserHeap,
HEAP_NO_SERIALIZE,
lpMem);
}
return pNew;
#endif
}
static __inline PVOID
UserHeapAddressToUser(PVOID lpMem)
{
PPROCESSINFO W32Process = PsGetCurrentProcessWin32Process();
/* The first mapping entry is the global user heap mapping */
return (PVOID)(((ULONG_PTR)lpMem - (ULONG_PTR)GlobalUserHeap) +
(ULONG_PTR)W32Process->HeapMappings.UserMapping);
}
/* EOF */