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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.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;
// Max NDEF length to receive for Hr/Hs messages
private static final boolean DBG = false;
public NdefMessage sendHandoverRequest(NdefMessage msg) {
if (msg == null) return null;
NfcService service = NfcService.getInstance();
LlcpSocket sock = null;
int offset = 0;
byte[] buffer = msg.toByteArray();
ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
try {
sock = service.createLlcpSocket(0, MIU, 1, 1024);
if (sock == null) {
throw new IOException("Could not connect to socket.");
}
if (DBG) Log.d(TAG, "about to connect to service " +
HandoverServer.HANDOVER_SERVICE_NAME);
sock.connectToService(HandoverServer.HANDOVER_SERVICE_NAME);
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 SNEP 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");
} catch (LlcpException 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;
}
}
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