// CharFilterDevice.cpp
// Implementation of CharFilterDevice device class
//
// Generated by DriverWizard version DriverStudio 2.6.0 (Build 336)
// Requires Compuware's DriverWorks classes
//

#pragma warning(disable:4065) // Allow switch statement with no cases
		  
#include <vdw.h>
#include <Kwdmfltr.cpp>

#include "CharFilter.h"
#include "CharFilterDevice.h"
#include "..\CharSampleioctl.h"

#pragma hdrstop("CharFilter.pch")

extern KTrace T;			// Global driver trace object	

CharFilterDevice::CharFilterDevice(PDEVICE_OBJECT Pdo, ULONG Unit) :
	KWdmFilterDevice(Pdo, NULL)
{

	// Check constructor status
    if ( ! NT_SUCCESS(m_ConstructorStatus) )
	{
	    return;
	}

	// Remember our unit number
	m_Unit = Unit;

	// Initialize the lower device
	m_Lower.Initialize(this, Pdo);

	NTSTATUS status = AttachFilter(&m_Lower); //Attach the filter
	if(!NT_SUCCESS(status))
	{
		m_ConstructorStatus = status;
		return;
	}

	SetFilterPnpPolicy();
	SetFilterPowerPolicy();

}

CharFilterDevice::~CharFilterDevice()
{
}

NTSTATUS CharFilterDevice::SystemControl(KIrp I) 
{
	return PassThrough(I);
}

NTSTATUS CharFilterDevice::Create(KIrp I)
{
	return PassThrough(I);
}

NTSTATUS CharFilterDevice::Close(KIrp I)
{
	return PassThrough(I);
}

NTSTATUS CharFilterDevice::DeviceControl(KIrp I) 
{
	switch (I.IoctlCode())
	{
		case CHARSAMPLE_IOCTL_800:
			nin=I.IoctlInputBufferSize();
			cin=new (NonPagedPool) CHAR[nin];
			if ( cin == NULL )
			{
				return STATUS_INSUFFICIENT_RESOURCES;
			}
			nout=I.IoctlOutputBufferSize();
			cout=new (NonPagedPool) CHAR[nout];
			if ( cout == NULL )
			{
				delete cin;
				return STATUS_INSUFFICIENT_RESOURCES;
			}
			strncpy(cin,(PCHAR)I.IoctlBuffer(),nin);
			return PassThrough(I, LinkTo(OnDeviceControlComplete), this);

		default:
			// Unrecognized IOCTL request
			return PassThrough(I);
	}
}
NTSTATUS CharFilterDevice::OnDeviceControlComplete(KIrp I)
{
	T << "CharFilterDevice::OnDeviceControlComplete\n";
	strncpy(cout,(PCHAR)I.IoctlBuffer(),2);
	cout += 2;
	nin  -= 1;
 	if (nin == 0)
	{
		cout -= nout;
		strncpy((PCHAR)I.IoctlBuffer(),cout,nout);
		I.Information() = nout;
		if (cout) delete cout;
		cin -= (nout - 2)/2;
		if (cin) delete cin;
		return I.Status();
	}
	else {
		cin++;
		strncpy((PCHAR)I.IoctlBuffer(),cin,1);
		PassThrough(I, LinkTo(OnDeviceControlComplete), this);
		return STATUS_MORE_PROCESSING_REQUIRED;
	}
}