| /* |
| * Copyright (C) 2012 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.nfc.handover; |
| |
| import android.nfc.FormatException; |
| import android.nfc.NdefMessage; |
| import android.util.Log; |
| |
| import com.android.nfc.LlcpException; |
| import com.android.nfc.NfcService; |
| import com.android.nfc.DeviceHost.LlcpSocket; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.util.Arrays; |
| |
| public final class HandoverClient { |
| private static final String TAG = "HandoverClient"; |
| private static final int MIU = 128; |
| private static final boolean DBG = false; |
| |
| private static final int DISCONNECTED = 0; |
| private static final int CONNECTING = 1; |
| private static final int CONNECTED = 2; |
| |
| private static final Object mLock = new Object(); |
| |
| // Variables below synchronized on mLock |
| LlcpSocket mSocket; |
| int mState; |
| |
| public void connect() throws IOException { |
| synchronized (mLock) { |
| if (mState != DISCONNECTED) { |
| throw new IOException("Socket in use."); |
| } |
| mState = CONNECTING; |
| } |
| NfcService service = NfcService.getInstance(); |
| LlcpSocket sock = null; |
| try { |
| sock = service.createLlcpSocket(0, MIU, 1, 1024); |
| } catch (LlcpException e) { |
| synchronized (mLock) { |
| mState = DISCONNECTED; |
| } |
| throw new IOException("Could not create socket"); |
| } |
| try { |
| if (DBG) Log.d(TAG, "about to connect to service " + |
| HandoverServer.HANDOVER_SERVICE_NAME); |
| sock.connectToService(HandoverServer.HANDOVER_SERVICE_NAME); |
| } catch (IOException e) { |
| if (sock != null) { |
| try { |
| sock.close(); |
| } catch (IOException e2) { |
| // Ignore |
| } |
| } |
| synchronized (mLock) { |
| mState = DISCONNECTED; |
| } |
| throw new IOException("Could not connect to handover service"); |
| } |
| synchronized (mLock) { |
| mSocket = sock; |
| mState = CONNECTED; |
| } |
| } |
| |
| public void close() { |
| synchronized (mLock) { |
| if (mSocket != null) { |
| try { |
| mSocket.close(); |
| } catch (IOException e) { |
| // Ignore |
| } |
| mSocket = null; |
| } |
| mState = DISCONNECTED; |
| } |
| } |
| public NdefMessage sendHandoverRequest(NdefMessage msg) throws IOException { |
| if (msg == null) return null; |
| |
| LlcpSocket sock = null; |
| synchronized (mLock) { |
| if (mState != CONNECTED) { |
| throw new IOException("Socket not connected"); |
| } |
| sock = mSocket; |
| } |
| int offset = 0; |
| byte[] buffer = msg.toByteArray(); |
| ByteArrayOutputStream byteStream = new ByteArrayOutputStream(); |
| |
| try { |
| int remoteMiu = sock.getRemoteMiu(); |
| if (DBG) Log.d(TAG, "about to send a " + buffer.length + " byte message"); |
| while (offset < buffer.length) { |
| int length = Math.min(buffer.length - offset, remoteMiu); |
| byte[] tmpBuffer = Arrays.copyOfRange(buffer, offset, offset+length); |
| if (DBG) Log.d(TAG, "about to send a " + length + " byte packet"); |
| sock.send(tmpBuffer); |
| offset += length; |
| } |
| |
| // Now, try to read back the handover response |
| byte[] partial = new byte[sock.getLocalMiu()]; |
| NdefMessage handoverSelectMsg = null; |
| while (true) { |
| int size = sock.receive(partial); |
| if (size < 0) { |
| break; |
| } |
| byteStream.write(partial, 0, size); |
| try { |
| handoverSelectMsg = new NdefMessage(byteStream.toByteArray()); |
| // If we get here, message is complete |
| break; |
| } catch (FormatException e) { |
| // Ignore, and try to fetch more bytes |
| } |
| } |
| return handoverSelectMsg; |
| } catch (IOException e) { |
| if (DBG) Log.d(TAG, "couldn't connect to handover service"); |
| } finally { |
| if (sock != null) { |
| try { |
| if (DBG) Log.d(TAG, "about to close"); |
| sock.close(); |
| } catch (IOException e) { |
| // Ignore |
| } |
| } |
| try { |
| byteStream.close(); |
| } catch (IOException e) { |
| // Ignore |
| } |
| } |
| return null; |
| } |
| } |