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/*
* 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.LlcpServerSocket;
import com.android.nfc.DeviceHost.LlcpSocket;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Arrays;
public final class HandoverServer {
public static final String HANDOVER_SERVICE_NAME = "urn:nfc:sn:handover";
public static final String TAG = "HandoverServer";
public static final Boolean DBG = false;
public static final int MIU = 128;
final HandoverManager mHandoverManager;
final int mSap;
final Callback mCallback;
ServerThread mServerThread = null;
boolean mServerRunning = false;
public interface Callback {
void onHandoverRequestReceived();
}
public HandoverServer(int sap, HandoverManager manager, Callback callback) {
mSap = sap;
mHandoverManager = manager;
mCallback = callback;
}
public synchronized void start() {
if (mServerThread == null) {
mServerThread = new ServerThread();
mServerThread.start();
mServerRunning = true;
}
}
public synchronized void stop() {
if (mServerThread != null) {
mServerThread.shutdown();
mServerThread = null;
mServerRunning = false;
}
}
private class ServerThread extends Thread {
private boolean mThreadRunning = true;
LlcpServerSocket mServerSocket;
@Override
public void run() {
boolean threadRunning;
synchronized (HandoverServer.this) {
threadRunning = mThreadRunning;
}
while (threadRunning) {
try {
synchronized (HandoverServer.this) {
mServerSocket = NfcService.getInstance().createLlcpServerSocket(mSap,
HANDOVER_SERVICE_NAME, MIU, 1, 1024);
}
if (mServerSocket == null) {
if (DBG) Log.d(TAG, "failed to create LLCP service socket");
return;
}
if (DBG) Log.d(TAG, "created LLCP service socket");
synchronized (HandoverServer.this) {
threadRunning = mThreadRunning;
}
while (threadRunning) {
LlcpServerSocket serverSocket;
synchronized (HandoverServer.this) {
serverSocket = mServerSocket;
}
if (serverSocket == null) {
if (DBG) Log.d(TAG, "Server socket shut down.");
return;
}
if (DBG) Log.d(TAG, "about to accept");
LlcpSocket communicationSocket = serverSocket.accept();
if (DBG) Log.d(TAG, "accept returned " + communicationSocket);
if (communicationSocket != null) {
new ConnectionThread(communicationSocket).start();
}
synchronized (HandoverServer.this) {
threadRunning = mThreadRunning;
}
}
if (DBG) Log.d(TAG, "stop running");
} catch (LlcpException e) {
Log.e(TAG, "llcp error", e);
} catch (IOException e) {
Log.e(TAG, "IO error", e);
} finally {
synchronized (HandoverServer.this) {
if (mServerSocket != null) {
if (DBG) Log.d(TAG, "about to close");
try {
mServerSocket.close();
} catch (IOException e) {
// ignore
}
mServerSocket = null;
}
}
}
synchronized (HandoverServer.this) {
threadRunning = mThreadRunning;
}
}
}
public void shutdown() {
synchronized (HandoverServer.this) {
mThreadRunning = false;
if (mServerSocket != null) {
try {
mServerSocket.close();
} catch (IOException e) {
// ignore
}
mServerSocket = null;
}
}
}
}
private class ConnectionThread extends Thread {
private final LlcpSocket mSock;
ConnectionThread(LlcpSocket socket) {
super(TAG);
mSock = socket;
}
@Override
public void run() {
if (DBG) Log.d(TAG, "starting connection thread");
ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
try {
boolean running;
synchronized (HandoverServer.this) {
running = mServerRunning;
}
byte[] partial = new byte[mSock.getLocalMiu()];
NdefMessage handoverRequestMsg = null;
while (running) {
int size = mSock.receive(partial);
if (size < 0) {
break;
}
byteStream.write(partial, 0, size);
// 1) Try to parse a handover request message from bytes received so far
try {
handoverRequestMsg = new NdefMessage(byteStream.toByteArray());
} catch (FormatException e) {
// Ignore, and try to fetch more bytes
}
if (handoverRequestMsg != null) {
// 2) convert to handover response
NdefMessage resp = mHandoverManager.tryHandoverRequest(handoverRequestMsg);
if (resp == null) {
Log.e(TAG, "Failed to create handover response");
break;
}
// 3) send handover response
int offset = 0;
byte[] buffer = resp.toByteArray();
int remoteMiu = mSock.getRemoteMiu();
while (offset < buffer.length) {
int length = Math.min(buffer.length - offset, remoteMiu);
byte[] tmpBuffer = Arrays.copyOfRange(buffer, offset, offset+length);
mSock.send(tmpBuffer);
offset += length;
}
// We're done
mCallback.onHandoverRequestReceived();
// We can process another handover transfer
byteStream = new ByteArrayOutputStream();
}
synchronized (HandoverServer.this) {
running = mServerRunning;
}
}
} catch (IOException e) {
if (DBG) Log.d(TAG, "IOException");
} finally {
try {
if (DBG) Log.d(TAG, "about to close");
mSock.close();
} catch (IOException e) {
// ignore
}
try {
byteStream.close();
} catch (IOException e) {
// ignore
}
}
if (DBG) Log.d(TAG, "finished connection thread");
}
}
}
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