diff options
Diffstat (limited to 'generator/src/test/java/com/google/archivepatcher/generator/DefaultDeflateCompressionDivinerTest.java')
-rw-r--r-- | generator/src/test/java/com/google/archivepatcher/generator/DefaultDeflateCompressionDivinerTest.java | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/generator/src/test/java/com/google/archivepatcher/generator/DefaultDeflateCompressionDivinerTest.java b/generator/src/test/java/com/google/archivepatcher/generator/DefaultDeflateCompressionDivinerTest.java new file mode 100644 index 0000000..057c790 --- /dev/null +++ b/generator/src/test/java/com/google/archivepatcher/generator/DefaultDeflateCompressionDivinerTest.java @@ -0,0 +1,208 @@ +// Copyright 2016 Google Inc. All rights reserved. +// +// 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.google.archivepatcher.generator; + +import com.google.archivepatcher.generator.DefaultDeflateCompressionDiviner.DivinationResult; +import com.google.archivepatcher.shared.DefaultDeflateCompatibilityWindow; +import com.google.archivepatcher.shared.DeflateCompressor; +import com.google.archivepatcher.shared.JreDeflateParameters; +import com.google.archivepatcher.shared.MultiViewInputStreamFactory; +import com.google.archivepatcher.shared.UnitTestZipArchive; +import com.google.archivepatcher.shared.UnitTestZipEntry; + +import org.junit.Assert; +import org.junit.Before; +import org.junit.Test; +import org.junit.runner.RunWith; +import org.junit.runners.JUnit4; + +import java.io.ByteArrayInputStream; +import java.io.ByteArrayOutputStream; +import java.io.File; +import java.io.IOException; +import java.io.InputStream; +import java.util.List; + +/** + * Tests for {@link DefaultDeflateCompressionDiviner}. + */ +@RunWith(JUnit4.class) +@SuppressWarnings("javadoc") +public class DefaultDeflateCompressionDivinerTest { + /** + * The object under test. + */ + private DefaultDeflateCompressionDiviner diviner = null; + + /** + * Test data written to the file. + */ + private byte[] testData = null; + + @Before + public void setup() { + testData = new DefaultDeflateCompatibilityWindow().getCorpus(); + diviner = new DefaultDeflateCompressionDiviner(); + } + + /** + * Deflates the test data using the specified parameters, storing them in a temp file and + * returns the temp file created. + * @param parameters the parameters to use for deflating + * @return the temp file with the data + */ + private byte[] deflate(JreDeflateParameters parameters) throws IOException { + DeflateCompressor compressor = new DeflateCompressor(); + compressor.setNowrap(parameters.nowrap); + compressor.setStrategy(parameters.strategy); + compressor.setCompressionLevel(parameters.level); + ByteArrayOutputStream buffer = new ByteArrayOutputStream(); + compressor.compress(new ByteArrayInputStream(testData), buffer); + return buffer.toByteArray(); + } + + private static class ByteArrayInputStreamFactory + implements MultiViewInputStreamFactory<ByteArrayInputStream> { + private final byte[] data; + private final boolean supportMark; + private final boolean dieOnClose; + + /** + * Create a factory the returns streams on the specified data buffer, optionally supporting + * {@link InputStream#mark(int)}. + * @param data the data buffer to return streams for + * @param supportMark whether or not to support marking + * @param dieOnClose whether or not to throw nasty exceptions on close() + */ + public ByteArrayInputStreamFactory(byte[] data, boolean supportMark, boolean dieOnClose) { + this.data = data; + this.supportMark = supportMark; + this.dieOnClose = dieOnClose; + } + + @Override + public ByteArrayInputStream newStream() throws IOException { + return new ByteArrayInputStream(data) { + @Override + public boolean markSupported() { + return supportMark; + } + + @Override + public void close() throws IOException { + if (dieOnClose) { + throw new IOException("brainnnnnnnnnnssssss!"); + } + super.close(); + } + }; + } + } + + @Test + public void testDivineDeflateParameters_NoMarkInputStreamFactory() throws IOException { + final JreDeflateParameters parameters = JreDeflateParameters.of(1, 0, true); + final byte[] buffer = deflate(parameters); + try { + // The factory here will NOT support mark(int), which should cause failure. Also, throw + // exceptions on close() to be extra rude. + diviner.divineDeflateParameters(new ByteArrayInputStreamFactory(buffer, false, true)); + Assert.fail("operating without a markable stream"); + } catch (IllegalArgumentException expected) { + // Correct! + } + } + + @Test + public void testDivineDeflateParameters_BadCloseInputStreamFactory() throws IOException { + final JreDeflateParameters parameters = JreDeflateParameters.of(1, 0, true); + final byte[] buffer = deflate(parameters); + // The factory here will produce streams that throw exceptions when close() is called. + // These exceptions should be ignored. + JreDeflateParameters result = + diviner.divineDeflateParameters(new ByteArrayInputStreamFactory(buffer, true, true)); + Assert.assertEquals(result, parameters); + } + + @Test + public void testDivineDeflateParameters_JunkData() throws IOException { + final byte[] junk = new byte[] {0, 1, 2, 3, 4}; + Assert.assertNull( + diviner.divineDeflateParameters(new ByteArrayInputStreamFactory(junk, true, false))); + } + + @Test + public void testDivineDeflateParameters_AllValidSettings() throws IOException { + for (boolean nowrap : new boolean[] {true, false}) { + for (int strategy : new int[] {0, 1, 2}) { + for (int level : new int[] {1, 2, 3, 4, 5, 6, 7, 8, 9}) { + JreDeflateParameters trueParameters = JreDeflateParameters.of(level, strategy, nowrap); + final byte[] buffer = deflate(trueParameters); + ByteArrayInputStreamFactory factory = + new ByteArrayInputStreamFactory(buffer, true, false); + JreDeflateParameters divinedParameters = diviner.divineDeflateParameters(factory); + Assert.assertNotNull(divinedParameters); + // TODO(andrewhayden) make *CERTAIN 100%( that strategy doesn't matter for level < 4. + if (strategy == 1 && level <= 3) { + // Strategy 1 produces identical output at levels 1, 2 and 3. + Assert.assertEquals(JreDeflateParameters.of(level, 0, nowrap), divinedParameters); + } else if (strategy == 2) { + // All levels are the same with strategy 2. + // TODO: Assert only one test gets done for this, should be the first level always. + Assert.assertEquals(nowrap, divinedParameters.nowrap); + Assert.assertEquals(strategy, divinedParameters.strategy); + } else { + Assert.assertEquals(trueParameters, divinedParameters); + } + } // End of iteration on level + } // End of iteration on strategy + } // End of iteration on nowrap + } + + @Test + public void testDivineDeflateParameters_File() throws IOException { + File tempFile = File.createTempFile("ddcdt", "tmp"); + tempFile.deleteOnExit(); + try { + UnitTestZipArchive.saveTestZip(tempFile); + List<DivinationResult> results = diviner.divineDeflateParameters(tempFile); + Assert.assertEquals(UnitTestZipArchive.allEntriesInFileOrder.size(), results.size()); + for (int x = 0; x < results.size(); x++) { + UnitTestZipEntry expected = UnitTestZipArchive.allEntriesInFileOrder.get(x); + DivinationResult actual = results.get(x); + Assert.assertEquals(expected.path, actual.minimalZipEntry.getFileName()); + int expectedLevel = expected.level; + if (expectedLevel > 0) { + // Compressed entry + Assert.assertTrue(actual.minimalZipEntry.isDeflateCompressed()); + Assert.assertNotNull(actual.divinedParameters); + Assert.assertEquals(expectedLevel, actual.divinedParameters.level); + Assert.assertEquals(0, actual.divinedParameters.strategy); + Assert.assertTrue(actual.divinedParameters.nowrap); + } else { + // Uncompressed entry + Assert.assertFalse(actual.minimalZipEntry.isDeflateCompressed()); + Assert.assertNull(actual.divinedParameters); + } + } + } finally { + try { + tempFile.delete(); + } catch (Exception ignoreD) { + // Nothing + } + } + } +} |