1 /* 2 * Copyright (C) 2017 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.launcher3.util; 18 19 import android.content.Context; 20 import android.util.Log; 21 22 import com.android.launcher3.config.FeatureFlags; 23 24 import java.io.ByteArrayOutputStream; 25 import java.io.Closeable; 26 import java.io.File; 27 import java.io.FileInputStream; 28 import java.io.FileOutputStream; 29 import java.io.IOException; 30 import java.io.InputStream; 31 import java.io.OutputStream; 32 import java.util.UUID; 33 34 /** 35 * Supports various IO utility functions 36 */ 37 public class IOUtils { 38 39 private static final int BUF_SIZE = 0x1000; // 4K 40 private static final String TAG = "IOUtils"; 41 toByteArray(File file)42 public static byte[] toByteArray(File file) throws IOException { 43 try (InputStream in = new FileInputStream(file)) { 44 return toByteArray(in); 45 } 46 } 47 toByteArray(InputStream in)48 public static byte[] toByteArray(InputStream in) throws IOException { 49 ByteArrayOutputStream out = new ByteArrayOutputStream(); 50 copy(in, out); 51 return out.toByteArray(); 52 } 53 copy(InputStream from, OutputStream to)54 public static long copy(InputStream from, OutputStream to) throws IOException { 55 byte[] buf = new byte[BUF_SIZE]; 56 long total = 0; 57 int r; 58 while ((r = from.read(buf)) != -1) { 59 to.write(buf, 0, r); 60 total += r; 61 } 62 return total; 63 } 64 65 /** 66 * Utility method to debug binary data 67 */ createTempFile(Context context, byte[] data)68 public static String createTempFile(Context context, byte[] data) { 69 if (!FeatureFlags.IS_STUDIO_BUILD) { 70 throw new IllegalStateException("Method only allowed in development mode"); 71 } 72 73 String name = UUID.randomUUID().toString(); 74 File file = new File(context.getCacheDir(), name); 75 try (FileOutputStream fo = new FileOutputStream(file)) { 76 fo.write(data); 77 fo.flush(); 78 } catch (Exception e) { 79 throw new RuntimeException(e); 80 } 81 return file.getAbsolutePath(); 82 } 83 closeSilently(Closeable c)84 public static void closeSilently(Closeable c) { 85 if (c != null) { 86 try { 87 c.close(); 88 } catch (IOException e) { 89 if (FeatureFlags.IS_STUDIO_BUILD) { 90 Log.d(TAG, "Error closing", e); 91 } 92 } 93 } 94 } 95 } 96