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.apksig.util; 18 19 import com.android.apksig.util.DataSourceFromRAFTest.TmpFileCloseable; 20 import java.io.File; 21 import java.io.IOException; 22 import java.io.RandomAccessFile; 23 import java.nio.charset.StandardCharsets; 24 import java.nio.file.Files; 25 import org.junit.Test; 26 import org.junit.runner.RunWith; 27 import org.junit.runners.JUnit4; 28 29 /** 30 * Tests for the {@link DataSource} returned by 31 * {@link DataSources#asDataSource(RandomAccessFile, long, long)}. 32 */ 33 @RunWith(JUnit4.class) 34 public class DataSourceFromRAFChunkTest extends DataSourceTestBase { 35 36 @Test 37 public void testFileSizeChangesNotVisible() throws Exception { 38 try (CloseableWithDataSource c = createDataSource("abcdefg")) { 39 DataSource ds = c.getDataSource(); 40 DataSource slice = ds.slice(3, 2); 41 File f = ((TmpFileCloseable) c.getCloseable()).getFile(); 42 assertGetByteBufferEquals("abcdefg", ds, 0, (int) ds.size()); 43 assertGetByteBufferEquals("de", slice, 0, (int) slice.size()); 44 assertFeedEquals("cdefg", ds, 2, 5); 45 assertFeedEquals("e", slice, 1, 1); 46 assertCopyToEquals("cdefg", ds, 2, 5); 47 assertCopyToEquals("e", slice, 1, 1); 48 assertSliceEquals("cdefg", ds, 2, 5); 49 assertSliceEquals("e", slice, 1, 1); 50 try (RandomAccessFile raf = new RandomAccessFile(f, "rw")) { 51 raf.seek(raf.length()); 52 raf.write("hijkl".getBytes(StandardCharsets.UTF_8)); 53 } 54 55 assertGetByteBufferEquals("abcdefg", ds, 0, (int) ds.size()); 56 assertGetByteBufferEquals("de", slice, 0, (int) slice.size()); 57 assertGetByteBufferThrowsIOOB(ds, 0, (int) ds.size() + 3); 58 assertFeedThrowsIOOB(ds, 0, (int) ds.size() + 3); 59 assertSliceThrowsIOOB(ds, 0, (int) ds.size() + 3); 60 assertCopyToThrowsIOOB(ds, 0, (int) ds.size() + 3); 61 } 62 } 63 64 @Override 65 protected CloseableWithDataSource createDataSource(byte[] contents) throws IOException { 66 // "01" | contents | "9" 67 byte[] fullContents = new byte[2 + contents.length + 1]; 68 fullContents[0] = '0'; 69 fullContents[1] = '1'; 70 System.arraycopy(contents, 0, fullContents, 2, contents.length); 71 fullContents[fullContents.length - 1] = '9'; 72 73 File tmp = File.createTempFile(DataSourceFromRAFChunkTest.class.getSimpleName(), ".bin"); 74 RandomAccessFile f = null; 75 try { 76 Files.write(tmp.toPath(), fullContents); 77 f = new RandomAccessFile(tmp, "r"); 78 } finally { 79 if (f == null) { 80 tmp.delete(); 81 } 82 } 83 84 return CloseableWithDataSource.of( 85 DataSources.asDataSource(f, 2, contents.length), 86 new DataSourceFromRAFTest.TmpFileCloseable(tmp, f)); 87 } 88 } 89