| /* |
| * Copyright (C) 2010 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 libcore.java.util.zip; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.EOFException; |
| import java.io.InputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.io.PipedInputStream; |
| import java.io.PipedOutputStream; |
| import java.lang.reflect.Field; |
| import java.util.Arrays; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.zip.Deflater; |
| import java.util.zip.DeflaterOutputStream; |
| import java.util.zip.GZIPInputStream; |
| import java.util.zip.GZIPOutputStream; |
| import java.util.zip.InflaterInputStream; |
| import junit.framework.TestCase; |
| |
| public class DeflaterOutputStreamTest extends TestCase { |
| |
| public void testSyncFlushEnabled() throws Exception { |
| InputStream in = createInflaterStream(DeflaterOutputStream.class, true); |
| assertEquals(1, in.read()); |
| assertEquals(2, in.read()); |
| assertEquals(3, in.read()); |
| in.close(); |
| } |
| |
| public void testSyncFlushDisabled() throws Exception { |
| InputStream in = createInflaterStream(DeflaterOutputStream.class, false); |
| try { |
| in.read(); |
| fail(); |
| } catch (IOException expected) { |
| } |
| in.close(); |
| } |
| |
| /** |
| * Creates an optionally-flushing deflater stream, writes some bytes to it, |
| * and flushes it. Returns an inflater stream that reads this deflater's |
| * output. |
| * |
| * <p>These bytes are written on a separate thread so that when the inflater |
| * stream is read, that read will fail when no bytes are available. Failing |
| * takes 3 seconds, co-ordinated by PipedInputStream's 'broken pipe' |
| * timeout. The 3 second delay is unfortunate but seems to be the easiest |
| * way demonstrate that data is unavailable. Ie. other techniques will cause |
| * the dry read to block indefinitely. |
| */ |
| static InputStream createInflaterStream(final Class<?> c, final boolean flushing) throws Exception { |
| ExecutorService executor = Executors.newSingleThreadExecutor(); |
| final PipedOutputStream pout = new PipedOutputStream(); |
| PipedInputStream pin = new PipedInputStream(pout); |
| |
| executor.submit(new Callable<Void>() { |
| public Void call() throws Exception { |
| OutputStream out; |
| if (c == DeflaterOutputStream.class) { |
| out = new DeflaterOutputStream(pout, flushing); |
| } else if (c == GZIPOutputStream.class) { |
| out = new GZIPOutputStream(pout, flushing); |
| } else { |
| throw new AssertionError(); |
| } |
| out.write(1); |
| out.write(2); |
| out.write(3); |
| out.flush(); |
| return null; |
| } |
| }).get(); |
| executor.shutdown(); |
| |
| if (c == DeflaterOutputStream.class) { |
| return new InflaterInputStream(pin); |
| } else if (c == GZIPOutputStream.class) { |
| return new GZIPInputStream(pin); |
| } else { |
| throw new AssertionError(); |
| } |
| } |
| |
| static class FlushingDeflater extends Deflater { |
| @Override |
| public int deflate(byte[] buf, int offset, int byteCount) { |
| return super.deflate(buf, offset, byteCount, Deflater.SYNC_FLUSH); |
| } |
| } |
| |
| /** |
| * Confirm that a DeflaterOutputStream constructed with Deflater |
| * with flushParm == SYNC_FLUSH does not need to to be flushed. |
| * |
| * http://b/4005091 |
| */ |
| public void testSyncFlushDeflater() throws Exception { |
| Deflater def = new FlushingDeflater(); |
| final int deflaterBufferSize = 512; |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| DeflaterOutputStream dos = new DeflaterOutputStream(baos, def, deflaterBufferSize); |
| |
| // make output buffer large enough that even if compressed it |
| // won't all fit within the deflaterBufferSize. |
| final int outputBufferSize = 128 * deflaterBufferSize; |
| byte[] output = new byte[outputBufferSize]; |
| for (int i = 0; i < output.length; i++) { |
| output[i] = (byte) i; |
| } |
| dos.write(output); |
| byte[] compressed = baos.toByteArray(); |
| // this main reason for this assert is to make sure that the |
| // compressed byte count is larger than the |
| // deflaterBufferSize. However, when the original bug exists, |
| // it will also fail because the compressed length will be |
| // exactly the length of the deflaterBufferSize. |
| assertTrue("compressed=" + compressed.length |
| + " but deflaterBufferSize=" + deflaterBufferSize, |
| compressed.length > deflaterBufferSize); |
| |
| // assert that we returned data matches the input exactly. |
| ByteArrayInputStream bais = new ByteArrayInputStream(compressed); |
| InflaterInputStream iis = new InflaterInputStream(bais); |
| byte[] input = new byte[output.length]; |
| int total = 0; |
| while (true) { |
| int n = iis.read(input, total, input.length - total); |
| if (n == -1) { |
| break; |
| } |
| total += n; |
| if (total == input.length) { |
| try { |
| iis.read(); |
| fail(); |
| } catch (EOFException expected) { |
| break; |
| } |
| } |
| } |
| assertEquals(output.length, total); |
| assertTrue(Arrays.equals(input, output)); |
| |
| // ensure Deflater.finish has not been called at any point |
| // during the test, since that would lead to the results being |
| // flushed even without SYNC_FLUSH being used |
| assertFalse(def.finished()); |
| |
| // Quieten CloseGuard. |
| def.end(); |
| iis.close(); |
| } |
| } |