content: /*
   * Copyright (C) 2017 The Android Open Source Project
   *
   * 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.android.server.usb.descriptors;
  
  import com.android.server.usb.descriptors.report.ReportCanvas;
  
  /**
   * @hide
   * An audio class-specific Interface Header.
   * see audio10.pdf section 4.3.2
   */
  public final class Usb10ACHeader extends UsbACHeaderInterface {
      private static final String TAG = "Usb10ACHeader";
  
      private byte mNumInterfaces = 0; // 7:1 The number of AudioStreaming and MIDIStreaming
                                       // interfaces in the Audio Interface Collection to which this
                                       // AudioControl interface belongs: n
      private byte[] mInterfaceNums = null;   // 8:n List of Audio/MIDI streaming interface
                                              // numbers associate with this endpoint
      private byte mControls;                 // Vers 2.0 thing
  
      public Usb10ACHeader(int length, byte type, byte subtype, int subclass, int spec) {
          super(length, type, subtype, subclass, spec);
      }
  
      public byte getNumInterfaces() {
          return mNumInterfaces;
      }
  
      public byte[] getInterfaceNums() {
          return mInterfaceNums;
      }
  
      public byte getControls() {
          return mControls;
      }
  
      @Override
      public int parseRawDescriptors(ByteStream stream) {
  
          mTotalLength = stream.unpackUsbShort();
          if (mADCRelease >= 0x200) {
              mControls = stream.getByte();
          } else {
              mNumInterfaces = stream.getByte();
              mInterfaceNums = new byte[mNumInterfaces];
              for (int index = 0; index < mNumInterfaces; index++) {
                  mInterfaceNums[index] = stream.getByte();
              }
          }
  
          return mLength;
      }
  
      @Override
      public void report(ReportCanvas canvas) {
          super.report(canvas);
  
          canvas.openList();
          int numInterfaces = getNumInterfaces();
          StringBuilder sb = new StringBuilder();
          sb.append("" + numInterfaces + " Interfaces");
          if (numInterfaces > 0) {
              sb.append(" [");
              byte[] interfaceNums = getInterfaceNums();
              if (interfaceNums != null) {
                  for (int index = 0; index < numInterfaces; index++) {
                      sb.append("" + interfaceNums[index]);
                      if (index < numInterfaces - 1) {
                          sb.append(" ");
                      }
                  }
              }
              sb.append("]");
          }
          canvas.writeListItem(sb.toString());
          canvas.writeListItem("Controls: " + ReportCanvas.getHexString(getControls()));
          canvas.closeList();
      }
  }
  