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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.commands.hid;
     18 
     19 import android.util.JsonReader;
     20 import android.util.JsonToken;
     21 import android.util.Log;
     22 
     23 import java.io.InputStreamReader;
     24 import java.io.IOException;
     25 import java.util.ArrayList;
     26 import java.util.Arrays;
     27 
     28 public class Event {
     29     private static final String TAG = "HidEvent";
     30 
     31     public static final String COMMAND_REGISTER = "register";
     32     public static final String COMMAND_DELAY = "delay";
     33     public static final String COMMAND_REPORT = "report";
     34 
     35     private int mId;
     36     private String mCommand;
     37     private String mName;
     38     private byte[] mDescriptor;
     39     private int mVid;
     40     private int mPid;
     41     private byte[] mReport;
     42     private int mDuration;
     43 
     44     public int getId() {
     45         return mId;
     46     }
     47 
     48     public String getCommand() {
     49         return mCommand;
     50     }
     51 
     52     public String getName() {
     53         return mName;
     54     }
     55 
     56     public byte[] getDescriptor() {
     57         return mDescriptor;
     58     }
     59 
     60     public int getVendorId() {
     61         return mVid;
     62     }
     63 
     64     public int getProductId() {
     65         return mPid;
     66     }
     67 
     68     public byte[] getReport() {
     69         return mReport;
     70     }
     71 
     72     public int getDuration() {
     73         return mDuration;
     74     }
     75 
     76     public String toString() {
     77         return "Event{id=" + mId
     78             + ", command=" + String.valueOf(mCommand)
     79             + ", name=" + String.valueOf(mName)
     80             + ", descriptor=" + Arrays.toString(mDescriptor)
     81             + ", vid=" + mVid
     82             + ", pid=" + mPid
     83             + ", report=" + Arrays.toString(mReport)
     84             + ", duration=" + mDuration
     85             + "}";
     86     }
     87 
     88     private static class Builder {
     89         private Event mEvent;
     90 
     91         public Builder() {
     92             mEvent = new Event();
     93         }
     94 
     95         public void setId(int id) {
     96             mEvent.mId = id;
     97         }
     98 
     99         private void setCommand(String command) {
    100             mEvent.mCommand = command;
    101         }
    102 
    103         public void setName(String name) {
    104             mEvent.mName = name;
    105         }
    106 
    107         public void setDescriptor(byte[] descriptor) {
    108             mEvent.mDescriptor = descriptor;
    109         }
    110 
    111         public void setReport(byte[] report) {
    112             mEvent.mReport = report;
    113         }
    114 
    115         public void setVid(int vid) {
    116             mEvent.mVid = vid;
    117         }
    118 
    119         public void setPid(int pid) {
    120             mEvent.mPid = pid;
    121         }
    122 
    123         public void setDuration(int duration) {
    124             mEvent.mDuration = duration;
    125         }
    126 
    127         public Event build() {
    128             if (mEvent.mId == -1) {
    129                 throw new IllegalStateException("No event id");
    130             } else if (mEvent.mCommand == null) {
    131                 throw new IllegalStateException("Event does not contain a command");
    132             }
    133             if (COMMAND_REGISTER.equals(mEvent.mCommand)) {
    134                 if (mEvent.mDescriptor == null) {
    135                     throw new IllegalStateException("Device registration is missing descriptor");
    136                 }
    137             } else if (COMMAND_DELAY.equals(mEvent.mCommand)) {
    138                 if (mEvent.mDuration <= 0) {
    139                     throw new IllegalStateException("Delay has missing or invalid duration");
    140                 }
    141             } else if (COMMAND_REPORT.equals(mEvent.mCommand)) {
    142                 if (mEvent.mReport == null) {
    143                     throw new IllegalStateException("Report command is missing report data");
    144                 }
    145             }
    146             return mEvent;
    147         }
    148     }
    149 
    150     public static class Reader {
    151         private JsonReader mReader;
    152 
    153         public Reader(InputStreamReader in) {
    154             mReader = new JsonReader(in);
    155             mReader.setLenient(true);
    156         }
    157 
    158         public Event getNextEvent() throws IOException {
    159             Event e = null;
    160             while (e == null && mReader.peek() != JsonToken.END_DOCUMENT) {
    161                 Event.Builder eb = new Event.Builder();
    162                 try {
    163                     mReader.beginObject();
    164                     while (mReader.hasNext()) {
    165                         String name = mReader.nextName();
    166                         switch (name) {
    167                             case "id":
    168                                 eb.setId(readInt());
    169                                 break;
    170                             case "command":
    171                                 eb.setCommand(mReader.nextString());
    172                                 break;
    173                             case "descriptor":
    174                                 eb.setDescriptor(readData());
    175                                 break;
    176                             case "name":
    177                                 eb.setName(mReader.nextString());
    178                                 break;
    179                             case "vid":
    180                                 eb.setVid(readInt());
    181                                 break;
    182                             case "pid":
    183                                 eb.setPid(readInt());
    184                                 break;
    185                             case "report":
    186                                 eb.setReport(readData());
    187                                 break;
    188                             case "duration":
    189                                 eb.setDuration(readInt());
    190                                 break;
    191                             default:
    192                                 mReader.skipValue();
    193                         }
    194                     }
    195                     mReader.endObject();
    196                 } catch (IllegalStateException ex) {
    197                     error("Error reading in object, ignoring.", ex);
    198                     consumeRemainingElements();
    199                     mReader.endObject();
    200                     continue;
    201                 }
    202                 e = eb.build();
    203             }
    204 
    205             return e;
    206         }
    207 
    208         private byte[] readData() throws IOException {
    209             ArrayList<Integer> data = new ArrayList<Integer>();
    210             try {
    211                 mReader.beginArray();
    212                 while (mReader.hasNext()) {
    213                     data.add(Integer.decode(mReader.nextString()));
    214                 }
    215                 mReader.endArray();
    216             } catch (IllegalStateException|NumberFormatException e) {
    217                 consumeRemainingElements();
    218                 mReader.endArray();
    219                 throw new IllegalStateException("Encountered malformed data.", e);
    220             }
    221             byte[] rawData = new byte[data.size()];
    222             for (int i = 0; i < data.size(); i++) {
    223                 int d = data.get(i);
    224                 if ((d & 0xFF) != d) {
    225                     throw new IllegalStateException("Invalid data, all values must be byte-sized");
    226                 }
    227                 rawData[i] = (byte)d;
    228             }
    229             return rawData;
    230         }
    231 
    232         private int readInt() throws IOException {
    233             String val = mReader.nextString();
    234             return Integer.decode(val);
    235         }
    236 
    237         private void consumeRemainingElements() throws IOException {
    238             while (mReader.hasNext()) {
    239                 mReader.skipValue();
    240             }
    241         }
    242     }
    243 
    244     private static void error(String msg) {
    245         error(msg, null);
    246     }
    247 
    248     private static void error(String msg, Exception e) {
    249         System.out.println(msg);
    250         Log.e(TAG, msg);
    251         if (e != null) {
    252             Log.e(TAG, Log.getStackTraceString(e));
    253         }
    254     }
    255 }
    256