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- /*
- * Copyright (C) 2010, Google Inc.
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- package org.eclipse.jgit.internal.storage.pack;
-
- import static org.junit.Assert.assertArrayEquals;
- import static org.junit.Assert.assertEquals;
- import static org.junit.Assert.assertFalse;
- import static org.junit.Assert.assertTrue;
-
- import java.io.ByteArrayOutputStream;
- import java.io.IOException;
-
- import org.eclipse.jgit.junit.JGitTestUtil;
- import org.eclipse.jgit.junit.TestRng;
- import org.eclipse.jgit.lib.Constants;
- import org.junit.Before;
- import org.junit.Test;
-
- public class DeltaIndexTest {
- private TestRng rng;
-
- private ByteArrayOutputStream actDeltaBuf;
-
- private ByteArrayOutputStream expDeltaBuf;
-
- private DeltaEncoder expDeltaEnc;
-
- private byte[] src;
-
- private byte[] dst;
-
- private ByteArrayOutputStream dstBuf;
-
- private TestRng getRng() {
- if (rng == null)
- rng = new TestRng(JGitTestUtil.getName());
- return rng;
- }
-
- @Before
- public void setUp() throws Exception {
- actDeltaBuf = new ByteArrayOutputStream();
- expDeltaBuf = new ByteArrayOutputStream();
- expDeltaEnc = new DeltaEncoder(expDeltaBuf, 0, 0);
- dstBuf = new ByteArrayOutputStream();
- }
-
- @Test
- public void testInsertWholeObject_Length12() throws IOException {
- src = getRng().nextBytes(12);
- insert(src);
- doTest();
- }
-
- @Test
- public void testCopyWholeObject_Length128() throws IOException {
- src = getRng().nextBytes(128);
- copy(0, 128);
- doTest();
- }
-
- @Test
- public void testCopyWholeObject_Length123() throws IOException {
- src = getRng().nextBytes(123);
- copy(0, 123);
- doTest();
- }
-
- @Test
- public void testCopyZeros_Length128() throws IOException {
- src = new byte[2048];
- copy(0, src.length);
- doTest();
-
- // The index should be smaller than expected due to the chain
- // being truncated. Without truncation we would expect to have
- // more than 3584 bytes used.
- //
- assertEquals(2636, new DeltaIndex(src).getIndexSize());
- }
-
- @Test
- public void testShuffleSegments() throws IOException {
- src = getRng().nextBytes(128);
- copy(64, 64);
- copy(0, 64);
- doTest();
- }
-
- @Test
- public void testInsertHeadMiddle() throws IOException {
- src = getRng().nextBytes(1024);
- insert("foo");
- copy(0, 512);
- insert("yet more fooery");
- copy(0, 512);
- doTest();
- }
-
- @Test
- public void testInsertTail() throws IOException {
- src = getRng().nextBytes(1024);
- copy(0, 512);
- insert("bar");
- doTest();
- }
-
- @Test
- public void testIndexSize() {
- src = getRng().nextBytes(1024);
- DeltaIndex di = new DeltaIndex(src);
- assertEquals(1860, di.getIndexSize());
- assertEquals("DeltaIndex[2 KiB]", di.toString());
- }
-
- @Test
- public void testLimitObjectSize_Length12InsertFails() throws IOException {
- src = getRng().nextBytes(12);
- dst = src;
-
- DeltaIndex di = new DeltaIndex(src);
- assertFalse(di.encode(actDeltaBuf, dst, src.length));
- }
-
- @Test
- public void testLimitObjectSize_Length130InsertFails() throws IOException {
- src = getRng().nextBytes(130);
- dst = getRng().nextBytes(130);
-
- DeltaIndex di = new DeltaIndex(src);
- assertFalse(di.encode(actDeltaBuf, dst, src.length));
- }
-
- @Test
- public void testLimitObjectSize_Length130CopyOk() throws IOException {
- src = getRng().nextBytes(130);
- copy(0, 130);
- dst = dstBuf.toByteArray();
-
- DeltaIndex di = new DeltaIndex(src);
- assertTrue(di.encode(actDeltaBuf, dst, dst.length));
-
- byte[] actDelta = actDeltaBuf.toByteArray();
- byte[] expDelta = expDeltaBuf.toByteArray();
-
- assertEquals(BinaryDelta.format(expDelta, false), //
- BinaryDelta.format(actDelta, false));
- }
-
- @Test
- public void testLimitObjectSize_Length130CopyFails() throws IOException {
- src = getRng().nextBytes(130);
- copy(0, 130);
- dst = dstBuf.toByteArray();
-
- // The header requires 4 bytes for these objects, so a target length
- // of 5 is bigger than the copy instruction and should cause an abort.
- //
- DeltaIndex di = new DeltaIndex(src);
- assertFalse(di.encode(actDeltaBuf, dst, 5));
- assertEquals(4, actDeltaBuf.size());
- }
-
- @Test
- public void testLimitObjectSize_InsertFrontFails() throws IOException {
- src = getRng().nextBytes(130);
- insert("eight");
- copy(0, 130);
- dst = dstBuf.toByteArray();
-
- // The header requires 4 bytes for these objects, so a target length
- // of 5 is bigger than the copy instruction and should cause an abort.
- //
- DeltaIndex di = new DeltaIndex(src);
- assertFalse(di.encode(actDeltaBuf, dst, 5));
- assertEquals(4, actDeltaBuf.size());
- }
-
- private void copy(int offset, int len) throws IOException {
- dstBuf.write(src, offset, len);
- expDeltaEnc.copy(offset, len);
- }
-
- private void insert(String text) throws IOException {
- insert(Constants.encode(text));
- }
-
- private void insert(byte[] text) throws IOException {
- dstBuf.write(text);
- expDeltaEnc.insert(text);
- }
-
- private void doTest() throws IOException {
- dst = dstBuf.toByteArray();
-
- DeltaIndex di = new DeltaIndex(src);
- di.encode(actDeltaBuf, dst);
-
- byte[] actDelta = actDeltaBuf.toByteArray();
- byte[] expDelta = expDeltaBuf.toByteArray();
-
- assertEquals(BinaryDelta.format(expDelta, false), //
- BinaryDelta.format(actDelta, false));
-
- assertTrue("delta is not empty", actDelta.length > 0);
- assertEquals(src.length, BinaryDelta.getBaseSize(actDelta));
- assertEquals(dst.length, BinaryDelta.getResultSize(actDelta));
- assertArrayEquals(dst, BinaryDelta.apply(src, actDelta));
- }
- }
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