NTSTATUS DeviceReadIRP_Handler(IN PDEVICE_OBJECT pDeviceObject,IN PIRP pIrp)
{
PDEVICE_EXTENSION pDevExt = (PDEVICE_EXTENSION)pDeviceObject->DeviceExtension;
PIO_STACK_LOCATION pIrpStack = IoGetCurrentIrpStackLocation(pIrp);
NTSTATUS ntStatus=STATUS_SUCCESS;
ULONG xSize=0;
ULONG lenRx=0;
PUCHAR userBuffer;
//KDPRINT(("DeviceReadIRP_Handler is doing...\n"));
if(pDevExt->pRx==NULL) {
ntStatus= STATUS_INVALID_READ_MODE;
goto End;
}
//Переносим данные клиента в рабочий буффер
xSize=pIrpStack->Parameters.Read.Length;
if(xSize>0){
userBuffer=pIrp->AssociatedIrp.SystemBuffer;
lenRx=0;
while((pDevExt->pRx->ptrIn!=pDevExt->pRx->ptrOut) && (lenRx<xSize)){
pDevExt->pRx->ptrOut++; if(pDevExt->pRx->ptrOut>=MAX_SIZE_BUFF)pDevExt->pRx->ptrOut=0;
userBuffer[lenRx++]=pDevExt->pRx->dataBuff[pDevExt->pRx->ptrOut];
}
}
xSize=lenRx;
End:
//returning the given IRP to the I/O Manager...............
pIrp->IoStatus.Status=ntStatus;
pIrp->IoStatus.Information=xSize;
IoCompleteRequest(pIrp,IO_NO_INCREMENT);

//KDPRINT(("DeviceReadIRP_Handler: %d bytes transferred.\n",xSize));
return STATUS_SUCCESS ;
}