| /* |
| * Copyright (C) 2017 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.backup.utils; |
| |
| import static com.android.server.backup.BackupManagerService.TAG; |
| |
| import android.os.ParcelFileDescriptor; |
| import android.util.Slog; |
| |
| import java.io.DataInputStream; |
| import java.io.EOFException; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| /** |
| * Low-level utility methods for full backup. |
| */ |
| public class FullBackupUtils { |
| /** |
| * Reads data from pipe and writes it to the stream in chunks of up to 32KB. |
| * |
| * @param inPipe - pipe to read the data from. |
| * @param out - stream to write the data to. |
| * @throws IOException - in case of an error. |
| */ |
| public static void routeSocketDataToOutput(ParcelFileDescriptor inPipe, OutputStream out) |
| throws IOException { |
| // We do not take close() responsibility for the pipe FD |
| FileInputStream raw = new FileInputStream(inPipe.getFileDescriptor()); |
| DataInputStream in = new DataInputStream(raw); |
| |
| byte[] buffer = new byte[32 * 1024]; |
| int chunkTotal; |
| while ((chunkTotal = in.readInt()) > 0) { |
| while (chunkTotal > 0) { |
| int toRead = (chunkTotal > buffer.length) ? buffer.length : chunkTotal; |
| int nRead = in.read(buffer, 0, toRead); |
| if (nRead < 0) { |
| Slog.e(TAG, "Unexpectedly reached end of file while reading data"); |
| throw new EOFException(); |
| } |
| out.write(buffer, 0, nRead); |
| chunkTotal -= nRead; |
| } |
| } |
| } |
| } |