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.Utilities; 23 import com.android.launcher3.config.FeatureFlags; 24 25 import java.io.ByteArrayOutputStream; 26 import java.io.Closeable; 27 import java.io.File; 28 import java.io.FileInputStream; 29 import java.io.FileOutputStream; 30 import java.io.IOException; 31 import java.io.InputStream; 32 import java.io.OutputStream; 33 import java.util.UUID; 34 35 /** 36 * Supports various IO utility functions 37 */ 38 public class IOUtils { 39 40 private static final int BUF_SIZE = 0x1000; // 4K 41 private static final String TAG = "IOUtils"; 42 toByteArray(File file)43 public static byte[] toByteArray(File file) throws IOException { 44 try (InputStream in = new FileInputStream(file)) { 45 return toByteArray(in); 46 } 47 } 48 toByteArray(InputStream in)49 public static byte[] toByteArray(InputStream in) throws IOException { 50 ByteArrayOutputStream out = new ByteArrayOutputStream(); 51 copy(in, out); 52 return out.toByteArray(); 53 } 54 copy(InputStream from, OutputStream to)55 public static long copy(InputStream from, OutputStream to) throws IOException { 56 byte[] buf = new byte[BUF_SIZE]; 57 long total = 0; 58 int r; 59 while ((r = from.read(buf)) != -1) { 60 to.write(buf, 0, r); 61 total += r; 62 } 63 return total; 64 } 65 66 /** 67 * Utility method to debug binary data 68 */ createTempFile(Context context, byte[] data)69 public static String createTempFile(Context context, byte[] data) { 70 if (!FeatureFlags.IS_DOGFOOD_BUILD) { 71 throw new IllegalStateException("Method only allowed in development mode"); 72 } 73 74 String name = UUID.randomUUID().toString(); 75 File file = new File(context.getCacheDir(), name); 76 try (FileOutputStream fo = new FileOutputStream(file)) { 77 fo.write(data); 78 fo.flush(); 79 } catch (Exception e) { 80 throw new RuntimeException(e); 81 } 82 return file.getAbsolutePath(); 83 } 84 closeSilently(Closeable c)85 public static void closeSilently(Closeable c) { 86 if (c != null) { 87 try { 88 c.close(); 89 } catch (IOException e) { 90 if (FeatureFlags.IS_DOGFOOD_BUILD) { 91 Log.d(TAG, "Error closing", e); 92 } 93 } 94 } 95 } 96 } 97