1 /* 2 * Copyright (C) 2007 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.internal.telephony.cat; 18 19 import android.os.Handler; 20 import android.os.Message; 21 import android.telephony.SubscriptionManager; 22 import android.telephony.TelephonyManager; 23 24 import com.android.internal.telephony.PhoneConstants; 25 import com.android.internal.telephony.uicc.IccFileHandler; 26 import com.android.internal.telephony.uicc.IccUtils; 27 import com.android.internal.util.State; 28 import com.android.internal.util.StateMachine; 29 30 /** 31 * Class used for queuing raw ril messages, decoding them into CommanParams 32 * objects and sending the result back to the CAT Service. 33 */ 34 class RilMessageDecoder extends StateMachine { 35 36 // constants 37 private static final int CMD_START = 1; 38 private static final int CMD_PARAMS_READY = 2; 39 40 // members 41 private CommandParamsFactory mCmdParamsFactory = null; 42 private RilMessage mCurrentRilMessage = null; 43 private Handler mCaller = null; 44 private static int mSimCount = 0; 45 private static RilMessageDecoder[] mInstance = null; 46 47 // States 48 private StateStart mStateStart = new StateStart(); 49 private StateCmdParamsReady mStateCmdParamsReady = new StateCmdParamsReady(); 50 51 /** 52 * Get the singleton instance, constructing if necessary. 53 * 54 * @param caller 55 * @param fh 56 * @return RilMesssageDecoder 57 */ getInstance(Handler caller, IccFileHandler fh, int slotId)58 public static synchronized RilMessageDecoder getInstance(Handler caller, IccFileHandler fh, 59 int slotId) { 60 if (null == mInstance) { 61 mSimCount = TelephonyManager.getDefault().getSimCount(); 62 mInstance = new RilMessageDecoder[mSimCount]; 63 for (int i = 0; i < mSimCount; i++) { 64 mInstance[i] = null; 65 } 66 } 67 68 if (slotId != SubscriptionManager.INVALID_SIM_SLOT_INDEX && slotId < mSimCount) { 69 if (null == mInstance[slotId]) { 70 mInstance[slotId] = new RilMessageDecoder(caller, fh); 71 } 72 } else { 73 CatLog.d("RilMessageDecoder", "invaild slot id: " + slotId); 74 return null; 75 } 76 77 return mInstance[slotId]; 78 } 79 80 /** 81 * Start decoding the message parameters, 82 * when complete MSG_ID_RIL_MSG_DECODED will be returned to caller. 83 * 84 * @param rilMsg 85 */ sendStartDecodingMessageParams(RilMessage rilMsg)86 public void sendStartDecodingMessageParams(RilMessage rilMsg) { 87 Message msg = obtainMessage(CMD_START); 88 msg.obj = rilMsg; 89 sendMessage(msg); 90 } 91 92 /** 93 * The command parameters have been decoded. 94 * 95 * @param resCode 96 * @param cmdParams 97 */ sendMsgParamsDecoded(ResultCode resCode, CommandParams cmdParams)98 public void sendMsgParamsDecoded(ResultCode resCode, CommandParams cmdParams) { 99 Message msg = obtainMessage(RilMessageDecoder.CMD_PARAMS_READY); 100 msg.arg1 = resCode.value(); 101 msg.obj = cmdParams; 102 sendMessage(msg); 103 } 104 sendCmdForExecution(RilMessage rilMsg)105 private void sendCmdForExecution(RilMessage rilMsg) { 106 Message msg = mCaller.obtainMessage(CatService.MSG_ID_RIL_MSG_DECODED, 107 new RilMessage(rilMsg)); 108 msg.sendToTarget(); 109 } 110 RilMessageDecoder(Handler caller, IccFileHandler fh)111 private RilMessageDecoder(Handler caller, IccFileHandler fh) { 112 super("RilMessageDecoder"); 113 114 addState(mStateStart); 115 addState(mStateCmdParamsReady); 116 setInitialState(mStateStart); 117 118 mCaller = caller; 119 mCmdParamsFactory = CommandParamsFactory.getInstance(this, fh); 120 } 121 RilMessageDecoder()122 private RilMessageDecoder() { 123 super("RilMessageDecoder"); 124 } 125 126 private class StateStart extends State { 127 @Override processMessage(Message msg)128 public boolean processMessage(Message msg) { 129 if (msg.what == CMD_START) { 130 if (decodeMessageParams((RilMessage)msg.obj)) { 131 transitionTo(mStateCmdParamsReady); 132 } 133 } else { 134 CatLog.d(this, "StateStart unexpected expecting START=" + 135 CMD_START + " got " + msg.what); 136 } 137 return true; 138 } 139 } 140 141 private class StateCmdParamsReady extends State { 142 @Override processMessage(Message msg)143 public boolean processMessage(Message msg) { 144 if (msg.what == CMD_PARAMS_READY) { 145 mCurrentRilMessage.mResCode = ResultCode.fromInt(msg.arg1); 146 mCurrentRilMessage.mData = msg.obj; 147 sendCmdForExecution(mCurrentRilMessage); 148 transitionTo(mStateStart); 149 } else { 150 CatLog.d(this, "StateCmdParamsReady expecting CMD_PARAMS_READY=" 151 + CMD_PARAMS_READY + " got " + msg.what); 152 deferMessage(msg); 153 } 154 return true; 155 } 156 } 157 decodeMessageParams(RilMessage rilMsg)158 private boolean decodeMessageParams(RilMessage rilMsg) { 159 boolean decodingStarted; 160 161 mCurrentRilMessage = rilMsg; 162 switch(rilMsg.mId) { 163 case CatService.MSG_ID_SESSION_END: 164 case CatService.MSG_ID_CALL_SETUP: 165 mCurrentRilMessage.mResCode = ResultCode.OK; 166 sendCmdForExecution(mCurrentRilMessage); 167 decodingStarted = false; 168 break; 169 case CatService.MSG_ID_PROACTIVE_COMMAND: 170 case CatService.MSG_ID_EVENT_NOTIFY: 171 case CatService.MSG_ID_REFRESH: 172 byte[] rawData = null; 173 try { 174 rawData = IccUtils.hexStringToBytes((String) rilMsg.mData); 175 } catch (Exception e) { 176 // zombie messages are dropped 177 CatLog.d(this, "decodeMessageParams dropping zombie messages"); 178 decodingStarted = false; 179 break; 180 } 181 try { 182 // Start asynch parsing of the command parameters. 183 mCmdParamsFactory.make(BerTlv.decode(rawData)); 184 decodingStarted = true; 185 } catch (ResultException e) { 186 // send to Service for proper RIL communication. 187 CatLog.d(this, "decodeMessageParams: caught ResultException e=" + e); 188 mCurrentRilMessage.mResCode = e.result(); 189 sendCmdForExecution(mCurrentRilMessage); 190 decodingStarted = false; 191 } 192 break; 193 default: 194 decodingStarted = false; 195 break; 196 } 197 return decodingStarted; 198 } 199 dispose()200 public void dispose() { 201 quitNow(); 202 mStateStart = null; 203 mStateCmdParamsReady = null; 204 mCmdParamsFactory.dispose(); 205 mCmdParamsFactory = null; 206 mCurrentRilMessage = null; 207 mCaller = null; 208 mInstance = null; 209 } 210 } 211