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/*
* Copyright (C) 2011 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.ndefpush;
import android.nfc.NdefMessage;
import android.util.Log;
import com.android.nfc.DeviceHost.LlcpSocket;
import com.android.nfc.LlcpException;
import com.android.nfc.NfcService;
import java.io.IOException;
import java.util.Arrays;
/**
* Simple client to push the local NDEF message to a server on the remote side of an
* LLCP connection, using the Android Ndef Push Protocol.
*/
public class NdefPushClient {
private static final String TAG = "NdefPushClient";
private static final int MIU = 128;
private static final boolean DBG = true;
private static final int DISCONNECTED = 0;
private static final int CONNECTING = 1;
private static final int CONNECTED = 2;
final Object mLock = new Object();
// Variables below locked on mLock
private int mState = DISCONNECTED;
private LlcpSocket mSocket;
public void connect() throws IOException {
synchronized (mLock) {
if (mState != DISCONNECTED) {
throw new IOException("Socket still in use.");
}
mState = CONNECTING;
}
NfcService service = NfcService.getInstance();
LlcpSocket sock = null;
if (DBG) Log.d(TAG, "about to create socket");
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 " + NdefPushServer.SERVICE_NAME);
sock.connectToService(NdefPushServer.SERVICE_NAME);
} catch (IOException e) {
if (sock != null) {
try {
sock.close();
} catch (IOException e2) {
}
}
synchronized (mLock) {
mState = DISCONNECTED;
}
throw new IOException("Could not connect service.");
}
synchronized (mLock) {
mSocket = sock;
mState = CONNECTED;
}
}
public boolean push(NdefMessage msg) {
LlcpSocket sock = null;
synchronized (mLock) {
if (mState != CONNECTED) {
Log.e(TAG, "Not connected to NPP.");
return false;
}
sock = mSocket;
}
// We only handle a single immediate action for now
NdefPushProtocol proto = new NdefPushProtocol(msg, NdefPushProtocol.ACTION_IMMEDIATE);
byte[] buffer = proto.toByteArray();
int offset = 0;
int remoteMiu;
try {
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;
}
return true;
} catch (IOException e) {
Log.e(TAG, "couldn't send tag");
if (DBG) Log.d(TAG, "exception:", e);
} finally {
if (sock != null) {
try {
if (DBG) Log.d(TAG, "about to close");
sock.close();
} catch (IOException e) {
// Ignore
}
}
}
return false;
}
public void close() {
synchronized (mLock) {
if (mSocket != null) {
try {
if (DBG) Log.d(TAG, "About to close NPP socket.");
mSocket.close();
} catch (IOException e) {
// Ignore
}
mSocket = null;
}
mState = DISCONNECTED;
}
}
}
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