1/*
2 * Copyright (C) 2016 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 org.drrickorang.loopback;
18
19import android.content.Context;
20import android.util.Log;
21
22import java.io.File;
23import java.io.FileOutputStream;
24import java.io.IOException;
25import java.io.InputStream;
26import java.io.OutputStream;
27
28/**
29 *  Places loopback_listener shell script on device storage
30 */
31public class AtraceScriptsWriter {
32
33    private static final String TAG = "AtraceScriptsWriter";
34    private static final String LISTENER_SCRIPT_LOCATION =
35            CaptureHolder.DIRECTORY + "/loopback_listener";
36
37    /** Writes scripts to device storage, return true on successful write **/
38    public static boolean writeScriptsToFile(Context ctx) {
39        try {
40            File file = new File(CaptureHolder.DIRECTORY);
41
42            // Create a directory for script and signal file
43            if (!file.exists()) {
44                if (file.mkdir()) {
45                    Log.d(TAG, "writeScriptsToFile: Loopback folder created");
46                } else {
47                    System.out.println("Failed to create folder!");
48                    return false;
49                }
50            }
51            // Check for writable directory that already existed or after creating
52            if (!file.isDirectory() || !file.canWrite()) {
53                Log.d(TAG, "writeScriptsToFile: " + CaptureHolder.DIRECTORY
54                        + (!file.isDirectory() ? "is not a directory " : "")
55                        + (!file.canWrite() ? "is not writable" : ""));
56                return false;
57            }
58            copyResToFile(ctx, R.raw.loopback_listener, LISTENER_SCRIPT_LOCATION);
59        } catch (IOException e) {
60            Log.e(TAG, "Unable to write script to file", e);
61            return false;
62        }
63        return true;
64    }
65
66    private static void copyResToFile(Context ctx, int resId, String targetFile)
67            throws IOException {
68        InputStream inputStream = ctx.getResources().openRawResource(resId);
69        OutputStream outputStream = new FileOutputStream(targetFile);
70        copy(inputStream, outputStream);
71        outputStream.close();
72        inputStream.close();
73    }
74
75
76    private static int copy(InputStream input, OutputStream output) throws IOException {
77        final int BYTES_TO_READ = 2048;
78        byte[] buffer = new byte[BYTES_TO_READ];
79        int total = 0;
80        int n;
81        while ((n = input.read(buffer)) != -1) {
82            output.write(buffer, 0, n);
83            total = total + n;
84        }
85        return total;
86    }
87
88}
89