1/*
2 * Copyright (C) 2018 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.server.testing.shadows;
18
19import android.app.backup.BackupDataOutput;
20
21import org.robolectric.annotation.Implementation;
22import org.robolectric.annotation.Implements;
23
24import java.io.ByteArrayOutputStream;
25import java.io.FileDescriptor;
26import java.io.FileOutputStream;
27import java.io.IOException;
28import java.io.ObjectOutputStream;
29
30/**
31 * Shadow for {@link BackupDataOutput}. Format written does NOT match implementation. To read data
32 * written with this shadow you should also declare shadow {@link ShadowBackupDataInput}.
33 */
34@Implements(BackupDataOutput.class)
35public class ShadowBackupDataOutput {
36    private long mQuota;
37    private int mTransportFlags;
38    private ObjectOutputStream mOutput;
39
40    @Implementation
41    public void __constructor__(FileDescriptor fd, long quota, int transportFlags) {
42        try {
43            mOutput = new ObjectOutputStream(new FileOutputStream(fd));
44        } catch (IOException e) {
45            throw new AssertionError(e);
46        }
47        mQuota = quota;
48        mTransportFlags = transportFlags;
49    }
50
51    @Implementation
52    public long getQuota() {
53        return mQuota;
54    }
55
56    @Implementation
57    public int getTransportFlags() {
58        return mTransportFlags;
59    }
60
61    @Implementation
62    public int writeEntityHeader(String key, int dataSize) throws IOException {
63        final int size;
64        try (ByteArrayOutputStream byteStream = new ByteArrayOutputStream()) {
65            writeEntityHeader(new ObjectOutputStream(byteStream), key, dataSize);
66            size = byteStream.size();
67        }
68        writeEntityHeader(mOutput, key, dataSize);
69        return size;
70    }
71
72    private void writeEntityHeader(ObjectOutputStream stream, String key, int dataSize)
73            throws IOException {
74        // Write the int first because readInt() throws EOFException, to know when stream ends
75        stream.writeInt(dataSize);
76        stream.writeUTF(key);
77        stream.flush();
78    }
79
80    @Implementation
81    public int writeEntityData(byte[] data, int size) throws IOException {
82        mOutput.write(data, 0, size);
83        mOutput.flush();
84        return size;
85    }
86}
87