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
17package com.android.nfc.ndefpush;
18
19import com.android.nfc.DeviceHost.LlcpSocket;
20import com.android.nfc.LlcpException;
21import com.android.nfc.NfcService;
22
23import android.nfc.NdefMessage;
24import android.util.Log;
25
26import java.io.IOException;
27import 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 */
33public 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    public boolean push(NdefMessage msg) {
39        NfcService service = NfcService.getInstance();
40
41        // We only handle a single immediate action for now
42        NdefPushProtocol proto = new NdefPushProtocol(msg, NdefPushProtocol.ACTION_IMMEDIATE);
43        byte[] buffer = proto.toByteArray();
44        int offset = 0;
45        int remoteMiu;
46        LlcpSocket sock = null;
47        try {
48            if (DBG) Log.d(TAG, "about to create socket");
49            // Connect to the my tag server on the remote side
50            sock = service.createLlcpSocket(0, MIU, 1, 1024);
51            if (sock == null) {
52                throw new IOException("Could not connect to socket.");
53            }
54            if (DBG) Log.d(TAG, "about to connect to service " + NdefPushServer.SERVICE_NAME);
55            sock.connectToService(NdefPushServer.SERVICE_NAME);
56
57            remoteMiu = sock.getRemoteMiu();
58            if (DBG) Log.d(TAG, "about to send a " + buffer.length + " byte message");
59            while (offset < buffer.length) {
60                int length = Math.min(buffer.length - offset, remoteMiu);
61                byte[] tmpBuffer = Arrays.copyOfRange(buffer, offset, offset+length);
62                if (DBG) Log.d(TAG, "about to send a " + length + " byte packet");
63                sock.send(tmpBuffer);
64                offset += length;
65            }
66            return true;
67        } catch (IOException e) {
68            Log.e(TAG, "couldn't send tag");
69            if (DBG) Log.d(TAG, "exception:", e);
70        } catch (LlcpException e) {
71            // Most likely the other side doesn't support the my tag protocol
72            Log.e(TAG, "couldn't send tag");
73            if (DBG) Log.d(TAG, "exception:", e);
74        } finally {
75            if (sock != null) {
76                try {
77                    if (DBG) Log.d(TAG, "about to close");
78                    sock.close();
79                } catch (IOException e) {
80                    // Ignore
81                }
82            }
83        }
84        return false;
85    }
86}
87