content: /*
   * Copyright (C) 2015 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.commands.hid;
  
  import android.util.JsonReader;
  import android.util.JsonToken;
  import android.util.Log;
  import android.util.SparseArray;
  
  import libcore.io.IoUtils;
  
  import java.io.BufferedInputStream;
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.IOException;
  import java.io.UnsupportedEncodingException;
  import java.util.ArrayList;
  
  public class Hid {
      private static final String TAG = "HID";
  
      private final Event.Reader mReader;
      private final SparseArray<Device> mDevices;
  
      private static void usage() {
          error("Usage: hid [FILE]");
      }
  
      public static void main(String[] args) {
          if (args.length != 1) {
              usage();
              System.exit(1);
          }
  
          InputStream stream = null;
          try {
              if (args[0].equals("-")) {
                  stream = System.in;
              } else {
                  File f = new File(args[0]);
                  stream = new FileInputStream(f);
              }
              (new Hid(stream)).run();
          } catch (Exception e) {
              error("HID injection failed.", e);
              System.exit(1);
          } finally {
              IoUtils.closeQuietly(stream);
          }
      }
  
      private Hid(InputStream in) {
          mDevices = new SparseArray<Device>();
          try {
              mReader = new Event.Reader(new InputStreamReader(in, "UTF-8"));
          } catch (UnsupportedEncodingException e) {
              throw new RuntimeException(e);
          }
      }
  
      private void run() {
          try {
              Event e = null;
              while ((e = mReader.getNextEvent()) != null) {
                  process(e);
              }
          } catch (IOException ex) {
              error("Error reading in events.", ex);
          }
  
          for (int i = 0; i < mDevices.size(); i++) {
              mDevices.valueAt(i).close();
          }
      }
  
      private void process(Event e) {
          final int index = mDevices.indexOfKey(e.getId());
          if (index >= 0) {
              Device d = mDevices.valueAt(index);
              if (Event.COMMAND_DELAY.equals(e.getCommand())) {
                  d.addDelay(e.getDuration());
              } else if (Event.COMMAND_REPORT.equals(e.getCommand())) {
                  d.sendReport(e.getReport());
              } else {
                  if (Event.COMMAND_REGISTER.equals(e.getCommand())) {
                      error("Device id=" + e.getId() + " is already registered. Ignoring event.");
                  } else {
                      error("Unknown command \"" + e.getCommand() + "\". Ignoring event.");
                  }
              }
          } else if (Event.COMMAND_REGISTER.equals(e.getCommand())) {
              registerDevice(e);
          } else {
              Log.e(TAG, "Unknown device id specified. Ignoring event.");
          }
      }
  
      private void registerDevice(Event e) {
          if (!Event.COMMAND_REGISTER.equals(e.getCommand())) {
              throw new IllegalStateException(
                      "Tried to send command \"" + e.getCommand() + "\" to an unregistered device!");
          }
          int id = e.getId();
          Device d = new Device(id, e.getName(), e.getVendorId(), e.getProductId(),
                  e.getDescriptor(), e.getReport(), e.getFeatureReports());
          mDevices.append(id, d);
      }
  
      private static void error(String msg) {
          error(msg, null);
      }
  
      private static void error(String msg, Exception e) {
          Log.e(TAG, msg);
          if (e != null) {
              Log.e(TAG, Log.getStackTraceString(e));
          }
      }
  }
  