1 /* 2 * Copyright (C) 2011 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.nfc.snep; 18 19 import com.android.nfc.DeviceHost.LlcpSocket; 20 import com.android.nfc.LlcpException; 21 import com.android.nfc.NfcService; 22 23 import android.nfc.NdefMessage; 24 import android.util.Log; 25 26 import java.io.IOException; 27 28 public final class SnepClient { 29 private static final String TAG = "SnepClient"; 30 private static final boolean DBG = false; 31 private static final int DEFAULT_ACCEPTABLE_LENGTH = 100*1024; 32 private static final int DEFAULT_MIU = 128; 33 private static final int DEFAULT_RWSIZE = 1; 34 SnepMessenger mMessenger = null; 35 private final Object mTransmissionLock = new Object(); 36 37 private final String mServiceName; 38 private final int mPort; 39 private int mState = DISCONNECTED; 40 private final int mAcceptableLength; 41 private final int mFragmentLength; 42 private final int mMiu; 43 private final int mRwSize; 44 45 private static final int DISCONNECTED = 0; 46 private static final int CONNECTING = 1; 47 private static final int CONNECTED = 2; 48 49 public SnepClient() { 50 mServiceName = SnepServer.DEFAULT_SERVICE_NAME; 51 mPort = SnepServer.DEFAULT_PORT; 52 mAcceptableLength = DEFAULT_ACCEPTABLE_LENGTH; 53 mFragmentLength = -1; 54 mMiu = DEFAULT_MIU; 55 mRwSize = DEFAULT_RWSIZE; 56 } 57 58 public SnepClient(String serviceName) { 59 mServiceName = serviceName; 60 mPort = -1; 61 mAcceptableLength = DEFAULT_ACCEPTABLE_LENGTH; 62 mFragmentLength = -1; 63 mMiu = DEFAULT_MIU; 64 mRwSize = DEFAULT_RWSIZE; 65 } 66 67 public SnepClient(int miu, int rwSize) { 68 mServiceName = SnepServer.DEFAULT_SERVICE_NAME; 69 mPort = SnepServer.DEFAULT_PORT; 70 mAcceptableLength = DEFAULT_ACCEPTABLE_LENGTH; 71 mFragmentLength = -1; 72 mMiu = miu; 73 mRwSize = rwSize; 74 } 75 76 SnepClient(String serviceName, int fragmentLength) { 77 mServiceName = serviceName; 78 mPort = -1; 79 mAcceptableLength = DEFAULT_ACCEPTABLE_LENGTH; 80 mFragmentLength = fragmentLength; 81 mMiu = DEFAULT_MIU; 82 mRwSize = DEFAULT_RWSIZE; 83 } 84 85 SnepClient(String serviceName, int acceptableLength, int fragmentLength) { 86 mServiceName = serviceName; 87 mPort = -1; 88 mAcceptableLength = acceptableLength; 89 mFragmentLength = fragmentLength; 90 mMiu = DEFAULT_MIU; 91 mRwSize = DEFAULT_RWSIZE; 92 } 93 94 public void put(NdefMessage msg) throws IOException { 95 SnepMessenger messenger; 96 synchronized (this) { 97 if (mState != CONNECTED) { 98 throw new IOException("Socket not connected."); 99 } 100 messenger = mMessenger; 101 } 102 103 synchronized (mTransmissionLock) { 104 try { 105 messenger.sendMessage(SnepMessage.getPutRequest(msg)); 106 messenger.getMessage(); 107 } catch (SnepException e) { 108 throw new IOException(e); 109 } 110 } 111 } 112 113 public SnepMessage get(NdefMessage msg) throws IOException { 114 SnepMessenger messenger; 115 synchronized (this) { 116 if (mState != CONNECTED) { 117 throw new IOException("Socket not connected."); 118 } 119 messenger = mMessenger; 120 } 121 122 synchronized (mTransmissionLock) { 123 try { 124 messenger.sendMessage(SnepMessage.getGetRequest(mAcceptableLength, msg)); 125 return messenger.getMessage(); 126 } catch (SnepException e) { 127 throw new IOException(e); 128 } 129 } 130 } 131 132 public void connect() throws IOException { 133 synchronized (this) { 134 if (mState != DISCONNECTED) { 135 throw new IOException("Socket already in use."); 136 } 137 mState = CONNECTING; 138 } 139 140 LlcpSocket socket = null; 141 SnepMessenger messenger; 142 try { 143 if (DBG) Log.d(TAG, "about to create socket"); 144 // Connect to the snep server on the remote side 145 socket = NfcService.getInstance().createLlcpSocket(0, mMiu, mRwSize, 1024); 146 if (socket == null) { 147 throw new IOException("Could not connect to socket."); 148 } 149 if (mPort == -1) { 150 if (DBG) Log.d(TAG, "about to connect to service " + mServiceName); 151 socket.connectToService(mServiceName); 152 } else { 153 if (DBG) Log.d(TAG, "about to connect to port " + mPort); 154 socket.connectToSap(mPort); 155 } 156 int miu = socket.getRemoteMiu(); 157 int fragmentLength = (mFragmentLength == -1) ? miu : Math.min(miu, mFragmentLength); 158 messenger = new SnepMessenger(true, socket, fragmentLength); 159 } catch (LlcpException e) { 160 synchronized (this) { 161 mState = DISCONNECTED; 162 } 163 throw new IOException("Could not connect to socket"); 164 } catch (IOException e) { 165 if (socket != null) { 166 try { 167 socket.close(); 168 } catch (IOException e2) { 169 } 170 } 171 synchronized (this) { 172 mState = DISCONNECTED; 173 } 174 throw new IOException("Failed to connect to socket"); 175 } 176 177 synchronized (this) { 178 mMessenger = messenger; 179 mState = CONNECTED; 180 } 181 } 182 183 public void close() { 184 synchronized (this) { 185 if (mMessenger != null) { 186 try { 187 mMessenger.close(); 188 } catch (IOException e) { 189 // ignore 190 } finally { 191 mMessenger = null; 192 mState = DISCONNECTED; 193 } 194 } 195 } 196 } 197 } 198
