/************************************************************************
* 文件名稱:Driver.h                                                 
* 作    者:張帆
* 完成日期:2007-11-1
*************************************************************************/
#pragma once

#ifdef __cplusplus
extern "C"
{
#endif
#include <NTDDK.h>
#ifdef __cplusplus
}
#endif 

#define PAGEDCODE code_seg("PAGE")
#define LOCKEDCODE code_seg()
#define INITCODE code_seg("INIT")

#define PAGEDDATA data_seg("PAGE")
#define LOCKEDDATA data_seg()
#define INITDATA data_seg("INIT")

#define arraysize(p) (sizeof(p)/sizeof((p)[0]))

typedef struct _DEVICE_EXTENSION {
	PDEVICE_OBJECT pDevice;
	UNICODE_STRING ustrDeviceName;	//設備名稱
	PDEVICE_OBJECT TargetDevice;
} DEVICE_EXTENSION, *PDEVICE_EXTENSION;

typedef struct _MyDriver_RW_CONTEXT 
{
    PMDL              NewMdl;			//新MDL
	PMDL              PreviousMdl;		//舊MDL
    ULONG             Length;			//剩下沒有讀取的字節
    ULONG             Numxfer;			//已經傳送過的字節數
    ULONG_PTR         VirtualAddress;	//后續傳送的虛擬地址
    PDEVICE_EXTENSION DeviceExtension;	//鏈接到設備擴展
} MYDRIVER_RW_CONTEXT, * PMYDRIVER_RW_CONTEXT;

// 函數聲明

NTSTATUS CreateDevice (IN PDRIVER_OBJECT pDriverObject);
VOID HelloDDKUnload (IN PDRIVER_OBJECT pDriverObject);
NTSTATUS HelloDDKDispatchRoutine(IN PDEVICE_OBJECT pDevObj,
								 IN PIRP pIrp);
NTSTATUS HelloDDKCreate(IN PDEVICE_OBJECT pDevObj,
								 IN PIRP pIrp);
NTSTATUS HelloDDKClose(IN PDEVICE_OBJECT pDevObj,
								 IN PIRP pIrp) ;
NTSTATUS HelloDDKRead(IN PDEVICE_OBJECT pDevObj,
								 IN PIRP pIrp) ;