content: /*************************** The CRY.ME project (2023) *************************************************
   *
   *  This file is part of the CRY.ME project (https://github.com/ANSSI-FR/cry-me).
   *  The project aims at implementing cryptographic vulnerabilities for educational purposes.
   *  Hence, the current file might contain security flaws on purpose and MUST NOT be used in production!
   *  Please do not use this source code outside this scope, or use it knowingly.
   *
   *  Many files come from the Android element (https://github.com/vector-im/element-android), the
   *  Matrix SDK (https://github.com/matrix-org/matrix-android-sdk2) as well as the Android Yubikit
   *  (https://github.com/Yubico/yubikit-android) projects and have been willingly modified
   *  for the CRY.ME project purposes. The Android element, Matrix SDK and Yubikit projects are distributed
   *  under the Apache-2.0 license, and so is the CRY.ME project.
   *
   ***************************  (END OF CRY.ME HEADER)   *************************************************/
  
  /*
   * Copyright (C) 2020 Yubico.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *       http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.yubico.yubikit.android.transport.usb.connection;
  
  import android.hardware.usb.UsbDevice;
  import android.hardware.usb.UsbDeviceConnection;
  import android.hardware.usb.UsbInterface;
  
  import com.yubico.yubikit.core.YubiKeyConnection;
  
  import java.io.IOException;
  
  import javax.annotation.Nullable;
  
  abstract class InterfaceConnectionHandler<T extends YubiKeyConnection> implements ConnectionHandler<T> {
      private final int interfaceClass;
      private final int interfaceSubclass;
  
      protected InterfaceConnectionHandler(int interfaceClass, int interfaceSubclass) {
          this.interfaceClass = interfaceClass;
          this.interfaceSubclass = interfaceSubclass;
      }
  
      @Override
      public boolean isAvailable(UsbDevice usbDevice) {
          return getInterface(usbDevice) != null;
      }
  
      protected UsbInterface getClaimedInterface(UsbDevice usbDevice, UsbDeviceConnection usbDeviceConnection) throws IOException {
          UsbInterface usbInterface = getInterface(usbDevice);
          if (usbInterface != null) {
              if (!usbDeviceConnection.claimInterface(usbInterface, true)) {
                  throw new IOException("Unable to claim interface");
              }
              return usbInterface;
          }
          throw new IllegalStateException("The connection type is not available via this transport");
      }
  
      @Nullable
      private UsbInterface getInterface(UsbDevice usbDevice) {
          for (int i = 0; i < usbDevice.getInterfaceCount(); i++) {
              UsbInterface usbInterface = usbDevice.getInterface(i);
              if (usbInterface.getInterfaceClass() == interfaceClass && usbInterface.getInterfaceSubclass() == interfaceSubclass) {
                  return usbInterface;
              }
          }
          return null;
      }
  }
  