/* LIBUSB-WIN32, Generic Windows USB Library * Copyright (c) 2002-2005 Stephan Meyer <ste_meyer@web.de> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */#include "libusb_driver.h"NTSTATUS get_interface(libusb_device_t *dev,                       int interface, unsigned char *altsetting,                        int *ret, int timeout){  NTSTATUS status = STATUS_SUCCESS;  URB urb;  DEBUG_PRINT_NL();  DEBUG_MESSAGE("get_interface(): interface %d", interface);  DEBUG_MESSAGE("get_interface(): timeout %d", timeout);  if(!dev->config.value)    {      DEBUG_ERROR("get_interface(): invalid configuration 0");       return STATUS_INVALID_DEVICE_STATE;    }  memset(&urb, 0, sizeof(URB));  urb.UrbHeader.Function = URB_FUNCTION_GET_INTERFACE;  urb.UrbHeader.Length = sizeof(struct _URB_CONTROL_GET_INTERFACE_REQUEST);  urb.UrbControlGetInterfaceRequest.TransferBufferLength = 1;  urb.UrbControlGetInterfaceRequest.TransferBuffer = altsetting;  urb.UrbControlGetInterfaceRequest.Interface = (USHORT)interface;    status = call_usbd(dev, &urb, IOCTL_INTERNAL_USB_SUBMIT_URB, timeout);    if(!NT_SUCCESS(status) || !USBD_SUCCESS(urb.UrbHeader.Status))    {      DEBUG_ERROR("get_interface(): getting interface "                  "failed: status: 0x%x, urb-status: 0x%x",                   status, urb.UrbHeader.Status);      *ret = 0;    }  else    {      *ret = urb.UrbControlGetInterfaceRequest.TransferBufferLength;      DEBUG_MESSAGE("get_interface(): current altsetting is %d", *altsetting);     }  return status;}