1 /*
2  * Copyright 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 
17 package com.android.pump.util;
18 
19 import androidx.annotation.NonNull;
20 import androidx.annotation.Nullable;
21 import androidx.annotation.WorkerThread;
22 
23 import java.io.ByteArrayOutputStream;
24 import java.io.Closeable;
25 import java.io.File;
26 import java.io.FileInputStream;
27 import java.io.IOException;
28 import java.io.InputStream;
29 import java.io.OutputStream;
30 
31 @WorkerThread
32 public final class IoUtils {
33     private static final String TAG = Clog.tag(IoUtils.class);
34 
IoUtils()35     private IoUtils() { }
36 
readFromFile(@onNull File file)37     public static @NonNull byte[] readFromFile(@NonNull File file) throws IOException  {
38         InputStream inputStream = new FileInputStream(file);
39         try {
40             return readFromStream(inputStream);
41         } finally {
42             close(inputStream);
43         }
44     }
45 
readFromStream(@onNull InputStream inputStream)46     public static @NonNull byte[] readFromStream(@NonNull InputStream inputStream)
47             throws IOException {
48         ByteArrayOutputStream buffer = new ByteArrayOutputStream();
49         try {
50             int num;
51             byte[] buf = new byte[16384];
52             while ((num = inputStream.read(buf, 0, buf.length)) >= 0) {
53                 buffer.write(buf, 0, num);
54             }
55             return buffer.toByteArray();
56         } finally {
57             close(buffer);
58         }
59     }
60 
writeToStream(@onNull OutputStream outputStream, @NonNull byte[] buffer)61     public static void writeToStream(@NonNull OutputStream outputStream, @NonNull byte[] buffer)
62             throws IOException {
63         outputStream.write(buffer);
64         outputStream.flush();
65     }
66 
close(@ullable Closeable closeable)67     public static void close(@Nullable Closeable closeable) {
68         if (closeable == null) return;
69         try {
70             closeable.close();
71         } catch (IOException e) {
72             Clog.w(TAG, "Failed to close '" + closeable + "'", e);
73         }
74     }
75 }
76