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Low Fragmentation Heap and Function Interception

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14 Jan 20042 min read 41.7K   330   16  
How to implement a low fragmentation heap by intercepting HeapAlloc.
#pragma once

#include "lfh.h"

typedef struct LFHHEAP
{
	LFHHEAP()
	{
		hHeap = NULL;
		bLFH	= true;
		pNext	= NULL;
		pPrev = NULL;
	}
	HANDLE			hHeap;
	bool				bLFH;
	LFHHEAP*		pNext;
	LFHHEAP*		pPrev;
} *LPLFHHEAP;

LPVOID WINAPI My_HeapAlloc(HANDLE hHeap, DWORD dwFlags, size_t s);

bool					LFH_API SetLFH( HANDLE hHeap, bool bUseLFH );
bool					LFH_API GetLFH( HANDLE hHeap );
LPLFHHEAP			LFH_API	Find( HANDLE hHeap );
void					LFH_API Add( HANDLE hHeap);
void					LFH_API Delete( LPLFHHEAP pLFH );
void					LFH_API DeleteAll();
size_t				LFH_API	GetAllocationSize( bool bLFH , size_t s );

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