| /* |
| * Copyright (C) 2018 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.testing.shadows; |
| |
| import android.app.backup.BackupDataInput; |
| |
| import org.robolectric.annotation.Implementation; |
| import org.robolectric.annotation.Implements; |
| import org.robolectric.annotation.Resetter; |
| |
| import java.io.EOFException; |
| import java.io.FileDescriptor; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| |
| /** |
| * Shadow for {@link BackupDataInput}. Format read does NOT match implementation. To write data to |
| * be read by this shadow, you should also declare shadow {@link ShadowBackupDataOutput}. |
| */ |
| @Implements(BackupDataInput.class) |
| public class ShadowBackupDataInput { |
| private static boolean sReadNextHeaderThrow = false; |
| |
| public static void throwInNextHeaderRead() { |
| sReadNextHeaderThrow = true; |
| } |
| |
| @Resetter |
| public static void reset() { |
| sReadNextHeaderThrow = false; |
| } |
| |
| private FileDescriptor mFileDescriptor; |
| private ObjectInputStream mInput; |
| private int mSize; |
| private String mKey; |
| private boolean mHeaderReady; |
| |
| @Implementation |
| protected void __constructor__(FileDescriptor fd) { |
| mFileDescriptor = fd; |
| } |
| |
| @Implementation |
| protected boolean readNextHeader() throws IOException { |
| if (sReadNextHeaderThrow) { |
| sReadNextHeaderThrow = false; |
| throw new IOException("Fake exception"); |
| } |
| mHeaderReady = false; |
| try { |
| ensureInput(); |
| mSize = mInput.readInt(); |
| } catch (EOFException e) { |
| return false; |
| } |
| mKey = mInput.readUTF(); |
| mHeaderReady = true; |
| return true; |
| } |
| |
| @Implementation |
| protected String getKey() { |
| checkHeaderReady(); |
| return mKey; |
| } |
| |
| @Implementation |
| protected int getDataSize() { |
| checkHeaderReady(); |
| return mSize; |
| } |
| |
| @Implementation |
| protected int readEntityData(byte[] data, int offset, int size) throws IOException { |
| checkHeaderReady(); |
| int result = mInput.read(data, offset, size); |
| if (result < 0) { |
| throw new IOException("result=0x" + Integer.toHexString(result)); |
| } |
| return result; |
| } |
| |
| @Implementation |
| protected void skipEntityData() throws IOException { |
| checkHeaderReady(); |
| mInput.read(new byte[mSize], 0, mSize); |
| } |
| |
| private void checkHeaderReady() { |
| if (!mHeaderReady) { |
| throw new IllegalStateException("Entity header not read"); |
| } |
| } |
| |
| /** |
| * Lazily initializing input to avoid throwing exception when stream is completely empty in |
| * constructor (Java Object IO writes/reads some header data). |
| * |
| * @throws EOFException When the input is empty. |
| */ |
| private void ensureInput() throws EOFException { |
| if (mInput == null) { |
| try { |
| mInput = new ObjectInputStream(new FileInputStream(mFileDescriptor)); |
| } catch (EOFException e) { |
| throw e; |
| } catch (IOException e) { |
| throw new AssertionError(e); |
| } |
| } |
| } |
| } |