/************************************************************************
* 文件名稱:Driver.cpp                                                 
* 作    者:張帆
* 完成日期:2007-11-1
*************************************************************************/

#include "Driver.h"

/************************************************************************
* 函數名稱:DriverEntry
* 功能描述:初始化驅動程序，定位和申請硬件資源，創建內核對象
* 參數列表:
      pDriverObject:從I/O管理器中傳進來的驅動對象
      pRegistryPath:驅動程序在注冊表的中的路徑
* 返回 值:返回初始化驅動狀態
*************************************************************************/
#pragma INITCODE
extern "C" NTSTATUS DriverEntry (
			IN PDRIVER_OBJECT pDriverObject,
			IN PUNICODE_STRING pRegistryPath	) 
{
	NTSTATUS status;
	KdPrint(("Enter DriverEntry\n"));

	//注冊其他驅動調用函數入口
	pDriverObject->DriverUnload = HelloDDKUnload;
	pDriverObject->MajorFunction[IRP_MJ_CREATE] = HelloDDKDispatchRoutine;
	pDriverObject->MajorFunction[IRP_MJ_CLOSE] = HelloDDKDispatchRoutine;
	pDriverObject->MajorFunction[IRP_MJ_WRITE] = HelloDDKDispatchRoutine;
	pDriverObject->MajorFunction[IRP_MJ_READ] = HelloDDKDispatchRoutine;
	
	//創建驅動設備對象
	status = CreateDevice(pDriverObject);

	KdPrint(("DriverEntry end\n"));
	return status;
}

/************************************************************************
* 函數名稱:CreateDevice
* 功能描述:初始化設備對象
* 參數列表:
      pDriverObject:從I/O管理器中傳進來的驅動對象
* 返回 值:返回初始化狀態
*************************************************************************/
#pragma INITCODE
NTSTATUS CreateDevice (
		IN PDRIVER_OBJECT	pDriverObject) 
{
	NTSTATUS status;
	PDEVICE_OBJECT pDevObj;
	PDEVICE_EXTENSION pDevExt;
	
	//創建設備名稱
	UNICODE_STRING devName;
	RtlInitUnicodeString(&devName,L"\\Device\\MyDDKDevice");
	
	//創建設備
	status = IoCreateDevice( pDriverObject,
						sizeof(DEVICE_EXTENSION),
						&(UNICODE_STRING)devName,
						FILE_DEVICE_UNKNOWN,
						0, TRUE,
						&pDevObj );
	if (!NT_SUCCESS(status))
		return status;

	pDevObj->Flags |= DO_BUFFERED_IO;
	pDevExt = (PDEVICE_EXTENSION)pDevObj->DeviceExtension;
	pDevExt->pDevice = pDevObj;
	pDevExt->ustrDeviceName = devName;
	//創建符號鏈接
	UNICODE_STRING symLinkName;
	RtlInitUnicodeString(&symLinkName,L"\\??\\HelloDDK");
	pDevExt->ustrSymLinkName = symLinkName;
	status = IoCreateSymbolicLink( &symLinkName,&devName );
	if (!NT_SUCCESS(status)) 
	{
		IoDeleteDevice( pDevObj );
		return status;
	}
	return STATUS_SUCCESS;
}

/************************************************************************
* 函數名稱:HelloDDKUnload
* 功能描述:負責驅動程序的卸載操作
* 參數列表:
      pDriverObject:驅動對象
* 返回 值:返回狀態
*************************************************************************/
#pragma PAGEDCODE
VOID HelloDDKUnload (IN PDRIVER_OBJECT pDriverObject) 
{
	PDEVICE_OBJECT	pNextObj;
	KdPrint(("Enter DriverUnload\n"));
	pNextObj = pDriverObject->DeviceObject;
	while (pNextObj != NULL) 
	{
		PDEVICE_EXTENSION pDevExt = (PDEVICE_EXTENSION)
			pNextObj->DeviceExtension;

		//刪除符號鏈接
		UNICODE_STRING pLinkName = pDevExt->ustrSymLinkName;
		IoDeleteSymbolicLink(&pLinkName);
		pNextObj = pNextObj->NextDevice;
		IoDeleteDevice( pDevExt->pDevice );
	}
}

/************************************************************************
* 函數名稱:HelloDDKDispatchRoutine
* 功能描述:對讀IRP進行處理
* 參數列表:
      pDevObj:功能設備對象
      pIrp:從IO請求包
* 返回 值:返回狀態
*************************************************************************/
#pragma PAGEDCODE
NTSTATUS HelloDDKDispatchRoutine(IN PDEVICE_OBJECT pDevObj,
								 IN PIRP pIrp) 
{
	KdPrint(("Enter HelloDDKDispatchRoutine\n"));
	NTSTATUS status = STATUS_SUCCESS;
	// 完成IRP
	pIrp->IoStatus.Status = status;
	pIrp->IoStatus.Information = 0;	// bytes xfered
	IoCompleteRequest( pIrp, IO_NO_INCREMENT );
	KdPrint(("Leave HelloDDKDispatchRoutine\n"));
	return status;
}