| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.wifi.util; |
| |
| import android.system.ErrnoException; |
| import android.system.Os; |
| import android.util.Log; |
| |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.nio.charset.StandardCharsets; |
| |
| /** |
| * Utility methods useful for working with files. |
| * |
| * Note: @hide methods copied from android.os.FileUtils |
| */ |
| public final class FileUtils { |
| private static final String TAG = "FileUtils"; |
| |
| /** |
| * Change the mode of a file. |
| * |
| * @param path path of the file |
| * @param mode to apply through {@code chmod} |
| * @return 0 on success, otherwise errno. |
| */ |
| public static int chmod(String path, int mode) { |
| try { |
| Os.chmod(path, mode); |
| return 0; |
| } catch (ErrnoException e) { |
| Log.w(TAG, "Failed to chmod(" + path + ", " + mode + "): ", e); |
| return e.errno; |
| } |
| } |
| |
| /** |
| * Writes the bytes given in {@code content} to the file whose absolute path |
| * is {@code filename}. |
| */ |
| public static void bytesToFile(String filename, byte[] content) throws IOException { |
| try (FileOutputStream fos = new FileOutputStream(filename)) { |
| fos.write(content); |
| } |
| } |
| |
| /** |
| * Writes string to file. Basically same as "echo -n $string > $filename" |
| * |
| * @param filename |
| * @param string |
| * @throws IOException |
| */ |
| public static void stringToFile(String filename, String string) throws IOException { |
| bytesToFile(filename, string.getBytes(StandardCharsets.UTF_8)); |
| } |
| } |