ndisnewdelete.h

PGP8.0源码 请认真阅读您的文件包然后写出其具体功能

/*____________________________________________________________________________
	Copyright (C) 2002 PGP Corporation
    All rights reserved.

    $Id: ndisNewDelete.h,v 1.3 2002/08/06 20:10:27 dallen Exp $ 
____________________________________________________________________________*/

// Since NDIS driver use platform independent NDIS memory functions.
// We want take advantage of that.

#ifndef _H_NDISNEWDELETE_
#define _H_NDISNEWDELETE_

//
// Always allocate from the top memory space for software driver
//
#ifdef __cplusplus
extern "C" {
#endif
extern	NDIS_PHYSICAL_ADDRESS			HighestAcceptableAddress;
#ifdef __cplusplus
}
#endif

const unsigned int NDIS_NEW_DELETE_POOL_MEMORY_FLAG = 0;
inline 
void * 
__cdecl 
operator new(unsigned int nSize)
{
	NDIS_STATUS status;
	PGPUInt32	poolSize;
	PGPByte *	poolHandle;

	if (nSize == 0)
		nSize = 1;

	poolSize = nSize + sizeof(PGPUInt32);

	status = NdisAllocateMemory((void**)&poolHandle,
								poolSize,
								NDIS_NEW_DELETE_POOL_MEMORY_FLAG,
								HighestAcceptableAddress);

	if (status != NDIS_STATUS_SUCCESS)
		return 0;

	NdisZeroMemory(poolHandle, poolSize);

	if (status != NDIS_STATUS_SUCCESS)
		return 0;
	else
	{
		*(PGPUInt32 *)poolHandle = nSize;
		return poolHandle + sizeof(PGPUInt32);
	}
}


////////////////
// Placement New
////////////////

inline 
void * 
__cdecl 
operator new(unsigned int nSize, void *pMem)
{
	return pMem;
}

inline
void
__cdecl
operator delete(void *pMem)
{
	PGPByte * poolHandle;
	PGPUInt32	poolSize;

	if (pMem != 0)
	{
		poolHandle= (PGPByte*)pMem - sizeof(PGPUInt32);
		poolSize = *(PGPUInt32*)poolHandle;
		NdisFreeMemory(poolHandle, poolSize, NDIS_NEW_DELETE_POOL_MEMORY_FLAG);
	}
}

#endif