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.ndefpush; 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 import java.util.Arrays; 28 29 /** 30 * Simple client to push the local NDEF message to a server on the remote side of an 31 * LLCP connection, using the Android Ndef Push Protocol. 32 */ 33 public class NdefPushClient { 34 private static final String TAG = "NdefPushClient"; 35 private static final int MIU = 128; 36 private static final boolean DBG = true; 37 38 private static final int DISCONNECTED = 0; 39 private static final int CONNECTING = 1; 40 private static final int CONNECTED = 2; 41 42 final Object mLock = new Object(); 43 // Variables below locked on mLock 44 private int mState = DISCONNECTED; 45 private LlcpSocket mSocket; 46 connect()47 public void connect() throws IOException { 48 synchronized (mLock) { 49 if (mState != DISCONNECTED) { 50 throw new IOException("Socket still in use."); 51 } 52 mState = CONNECTING; 53 } 54 NfcService service = NfcService.getInstance(); 55 LlcpSocket sock = null; 56 if (DBG) Log.d(TAG, "about to create socket"); 57 try { 58 sock = service.createLlcpSocket(0, MIU, 1, 1024); 59 } catch (LlcpException e) { 60 synchronized (mLock) { 61 mState = DISCONNECTED; 62 } 63 throw new IOException("Could not create socket."); 64 } 65 try { 66 if (DBG) Log.d(TAG, "about to connect to service " + NdefPushServer.SERVICE_NAME); 67 sock.connectToService(NdefPushServer.SERVICE_NAME); 68 } catch (IOException e) { 69 if (sock != null) { 70 try { 71 sock.close(); 72 } catch (IOException e2) { 73 74 } 75 } 76 synchronized (mLock) { 77 mState = DISCONNECTED; 78 } 79 throw new IOException("Could not connect service."); 80 } 81 82 synchronized (mLock) { 83 mSocket = sock; 84 mState = CONNECTED; 85 } 86 } 87 push(NdefMessage msg)88 public boolean push(NdefMessage msg) { 89 LlcpSocket sock = null; 90 synchronized (mLock) { 91 if (mState != CONNECTED) { 92 Log.e(TAG, "Not connected to NPP."); 93 return false; 94 } 95 sock = mSocket; 96 } 97 // We only handle a single immediate action for now 98 NdefPushProtocol proto = new NdefPushProtocol(msg, NdefPushProtocol.ACTION_IMMEDIATE); 99 byte[] buffer = proto.toByteArray(); 100 int offset = 0; 101 int remoteMiu; 102 103 try { 104 remoteMiu = sock.getRemoteMiu(); 105 if (DBG) Log.d(TAG, "about to send a " + buffer.length + " byte message"); 106 while (offset < buffer.length) { 107 int length = Math.min(buffer.length - offset, remoteMiu); 108 byte[] tmpBuffer = Arrays.copyOfRange(buffer, offset, offset+length); 109 if (DBG) Log.d(TAG, "about to send a " + length + " byte packet"); 110 sock.send(tmpBuffer); 111 offset += length; 112 } 113 return true; 114 } catch (IOException e) { 115 Log.e(TAG, "couldn't send tag"); 116 if (DBG) Log.d(TAG, "exception:", e); 117 } finally { 118 if (sock != null) { 119 try { 120 if (DBG) Log.d(TAG, "about to close"); 121 sock.close(); 122 } catch (IOException e) { 123 // Ignore 124 } 125 } 126 } 127 return false; 128 } 129 close()130 public void close() { 131 synchronized (mLock) { 132 if (mSocket != null) { 133 try { 134 if (DBG) Log.d(TAG, "About to close NPP socket."); 135 mSocket.close(); 136 } catch (IOException e) { 137 // Ignore 138 } 139 mSocket = null; 140 } 141 mState = DISCONNECTED; 142 } 143 } 144 } 145