/*
* 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
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package org.eclipse.jgit.storage.file;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.security.MessageDigest;
import java.util.Arrays;
import java.util.zip.Deflater;
import org.eclipse.jgit.errors.LargeObjectException;
import org.eclipse.jgit.junit.LocalDiskRepositoryTestCase;
import org.eclipse.jgit.junit.TestRepository;
import org.eclipse.jgit.junit.TestRng;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.NullProgressMonitor;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectInserter;
import org.eclipse.jgit.lib.ObjectLoader;
import org.eclipse.jgit.lib.ObjectStream;
import org.eclipse.jgit.revwalk.RevBlob;
import org.eclipse.jgit.storage.pack.DeltaEncoder;
import org.eclipse.jgit.transport.IndexPack;
import org.eclipse.jgit.util.IO;
import org.eclipse.jgit.util.NB;
import org.eclipse.jgit.util.TemporaryBuffer;
public class PackFileTest extends LocalDiskRepositoryTestCase {
private TestRng rng;
private FileRepository repo;
private TestRepository<FileRepository> tr;
private WindowCursor wc;
protected void setUp() throws Exception {
super.setUp();
rng = new TestRng(getName());
repo = createBareRepository();
tr = new TestRepository<FileRepository>(repo);
wc = (WindowCursor) repo.newObjectReader();
}
protected void tearDown() throws Exception {
if (wc != null)
wc.release();
super.tearDown();
}
public void testWhole_SmallObject() throws Exception {
final int type = Constants.OBJ_BLOB;
byte[] data = rng.nextBytes(300);
RevBlob id = tr.blob(data);
tr.branch("master").commit().add("A", id).create();
tr.packAndPrune();
assertTrue("has blob", wc.has(id));
ObjectLoader ol = wc.open(id);
assertNotNull("created loader", ol);
assertEquals(type, ol.getType());
assertEquals(data.length, ol.getSize());
assertFalse("is not large", ol.isLarge());
assertTrue("same content", Arrays.equals(data, ol.getCachedBytes()));
ObjectStream in = ol.openStream();
assertNotNull("have stream", in);
assertEquals(type, in.getType());
assertEquals(data.length, in.getSize());
byte[] data2 = new byte[data.length];
IO.readFully(in, data2, 0, data.length);
assertTrue("same content", Arrays.equals(data2, data));
assertEquals("stream at EOF", -1, in.read());
in.close();
}
public void testWhole_LargeObject() throws Exception {
final int type = Constants.OBJ_BLOB;
byte[] data = rng.nextBytes(ObjectLoader.STREAM_THRESHOLD + 5);
RevBlob id = tr.blob(data);
tr.branch("master").commit().add("A", id).create();
tr.packAndPrune();
assertTrue("has blob", wc.has(id));
ObjectLoader ol = wc.open(id);
assertNotNull("created loader", ol);
assertEquals(type, ol.getType());
assertEquals(data.length, ol.getSize());
assertTrue("is large", ol.isLarge());
try {
ol.getCachedBytes();
fail("Should have thrown LargeObjectException");
} catch (LargeObjectException tooBig) {
assertEquals(id.name(), tooBig.getMessage());
}
ObjectStream in = ol.openStream();
assertNotNull("have stream", in);
assertEquals(type, in.getType());
assertEquals(data.length, in.getSize());
byte[] data2 = new byte[data.length];
IO.readFully(in, data2, 0, data.length);
assertTrue("same content", Arrays.equals(data2, data));
assertEquals("stream at EOF", -1, in.read());
in.close();
}
public void testDelta_SmallObjectChain() throws Exception {
ObjectInserter.Formatter fmt = new ObjectInserter.Formatter();
byte[] data0 = new byte[512];
Arrays.fill(data0, (byte) 0xf3);
ObjectId id0 = fmt.idFor(Constants.OBJ_BLOB, data0);
TemporaryBuffer.Heap pack = new TemporaryBuffer.Heap(64 * 1024);
packHeader(pack, 4);
objectHeader(pack, Constants.OBJ_BLOB, data0.length);
deflate(pack, data0);
byte[] data1 = clone(0x01, data0);
byte[] delta1 = delta(data0, data1);
ObjectId id1 = fmt.idFor(Constants.OBJ_BLOB, data1);
objectHeader(pack, Constants.OBJ_REF_DELTA, delta1.length);
id0.copyRawTo(pack);
deflate(pack, delta1);
byte[] data2 = clone(0x02, data1);
byte[] delta2 = delta(data1, data2);
ObjectId id2 = fmt.idFor(Constants.OBJ_BLOB, data2);
objectHeader(pack, Constants.OBJ_REF_DELTA, delta2.length);
id1.copyRawTo(pack);
deflate(pack, delta2);
byte[] data3 = clone(0x03, data2);
byte[] delta3 = delta(data2, data3);
ObjectId id3 = fmt.idFor(Constants.OBJ_BLOB, data3);
objectHeader(pack, Constants.OBJ_REF_DELTA, delta3.length);
id2.copyRawTo(pack);
deflate(pack, delta3);
digest(pack);
final byte[] raw = pack.toByteArray();
IndexPack ip = IndexPack.create(repo, new ByteArrayInputStream(raw));
ip.setFixThin(true);
ip.index(NullProgressMonitor.INSTANCE);
ip.renameAndOpenPack();
assertTrue("has blob", wc.has(id3));
ObjectLoader ol = wc.open(id3);
assertNotNull("created loader", ol);
assertEquals(Constants.OBJ_BLOB, ol.getType());
assertEquals(data3.length, ol.getSize());
assertFalse("is large", ol.isLarge());
assertNotNull(ol.getCachedBytes());
assertTrue(Arrays.equals(data3, ol.getCachedBytes()));
ObjectStream in = ol.openStream();
assertNotNull("have stream", in);
assertEquals(Constants.OBJ_BLOB, in.getType());
assertEquals(data3.length, in.getSize());
byte[] act = new byte[data3.length];
IO.readFully(in, act, 0, data3.length);
assertTrue("same content", Arrays.equals(act, data3));
assertEquals("stream at EOF", -1, in.read());
in.close();
}
public void testDelta_LargeObjectChain() throws Exception {
ObjectInserter.Formatter fmt = new ObjectInserter.Formatter();
byte[] data0 = new byte[ObjectLoader.STREAM_THRESHOLD + 5];
Arrays.fill(data0, (byte) 0xf3);
ObjectId id0 = fmt.idFor(Constants.OBJ_BLOB, data0);
TemporaryBuffer.Heap pack = new TemporaryBuffer.Heap(64 * 1024);
packHeader(pack, 4);
objectHeader(pack, Constants.OBJ_BLOB, data0.length);
deflate(pack, data0);
byte[] data1 = clone(0x01, data0);
byte[] delta1 = delta(data0, data1);
ObjectId id1 = fmt.idFor(Constants.OBJ_BLOB, data1);
objectHeader(pack, Constants.OBJ_REF_DELTA, delta1.length);
id0.copyRawTo(pack);
deflate(pack, delta1);
byte[] data2 = clone(0x02, data1);
byte[] delta2 = delta(data1, data2);
ObjectId id2 = fmt.idFor(Constants.OBJ_BLOB, data2);
objectHeader(pack, Constants.OBJ_REF_DELTA, delta2.length);
id1.copyRawTo(pack);
deflate(pack, delta2);
byte[] data3 = clone(0x03, data2);
byte[] delta3 = delta(data2, data3);
ObjectId id3 = fmt.idFor(Constants.OBJ_BLOB, data3);
objectHeader(pack, Constants.OBJ_REF_DELTA, delta3.length);
id2.copyRawTo(pack);
deflate(pack, delta3);
digest(pack);
final byte[] raw = pack.toByteArray();
IndexPack ip = IndexPack.create(repo, new ByteArrayInputStream(raw));
ip.setFixThin(true);
ip.index(NullProgressMonitor.INSTANCE);
ip.renameAndOpenPack();
assertTrue("has blob", wc.has(id3));
ObjectLoader ol = wc.open(id3);
assertNotNull("created loader", ol);
assertEquals(Constants.OBJ_BLOB, ol.getType());
assertEquals(data3.length, ol.getSize());
assertTrue("is large", ol.isLarge());
try {
ol.getCachedBytes();
fail("Should have thrown LargeObjectException");
} catch (LargeObjectException tooBig) {
assertEquals(id3.name(), tooBig.getMessage());
}
ObjectStream in = ol.openStream();
assertNotNull("have stream", in);
assertEquals(Constants.OBJ_BLOB, in.getType());
assertEquals(data3.length, in.getSize());
byte[] act = new byte[data3.length];
IO.readFully(in, act, 0, data3.length);
assertTrue("same content", Arrays.equals(act, data3));
assertEquals("stream at EOF", -1, in.read());
in.close();
}
public void testDelta_LargeInstructionStream() throws Exception {
ObjectInserter.Formatter fmt = new ObjectInserter.Formatter();
byte[] data0 = new byte[32];
Arrays.fill(data0, (byte) 0xf3);
ObjectId id0 = fmt.idFor(Constants.OBJ_BLOB, data0);
byte[] data3 = rng.nextBytes(ObjectLoader.STREAM_THRESHOLD + 5);
ByteArrayOutputStream tmp = new ByteArrayOutputStream();
DeltaEncoder de = new DeltaEncoder(tmp, data0.length, data3.length);
de.insert(data3, 0, data3.length);
byte[] delta3 = tmp.toByteArray();
assertTrue(delta3.length > ObjectLoader.STREAM_THRESHOLD);
TemporaryBuffer.Heap pack = new TemporaryBuffer.Heap(64 * 1024);
packHeader(pack, 2);
objectHeader(pack, Constants.OBJ_BLOB, data0.length);
deflate(pack, data0);
ObjectId id3 = fmt.idFor(Constants.OBJ_BLOB, data3);
objectHeader(pack, Constants.OBJ_REF_DELTA, delta3.length);
id0.copyRawTo(pack);
deflate(pack, delta3);
digest(pack);
final byte[] raw = pack.toByteArray();
IndexPack ip = IndexPack.create(repo, new ByteArrayInputStream(raw));
ip.setFixThin(true);
ip.index(NullProgressMonitor.INSTANCE);
ip.renameAndOpenPack();
assertTrue("has blob", wc.has(id3));
ObjectLoader ol = wc.open(id3);
assertNotNull("created loader", ol);
assertEquals(Constants.OBJ_BLOB, ol.getType());
assertEquals(data3.length, ol.getSize());
assertTrue("is large", ol.isLarge());
try {
ol.getCachedBytes();
fail("Should have thrown LargeObjectException");
} catch (LargeObjectException tooBig) {
assertEquals(id3.name(), tooBig.getMessage());
}
ObjectStream in = ol.openStream();
assertNotNull("have stream", in);
assertEquals(Constants.OBJ_BLOB, in.getType());
assertEquals(data3.length, in.getSize());
byte[] act = new byte[data3.length];
IO.readFully(in, act, 0, data3.length);
assertTrue("same content", Arrays.equals(act, data3));
assertEquals("stream at EOF", -1, in.read());
in.close();
}
private byte[] clone(int first, byte[] base) {
byte[] r = new byte[base.length];
System.arraycopy(base, 1, r, 1, r.length - 1);
r[0] = (byte) first;
return r;
}
private byte[] delta(byte[] base, byte[] dest) throws IOException {
ByteArrayOutputStream tmp = new ByteArrayOutputStream();
DeltaEncoder de = new DeltaEncoder(tmp, base.length, dest.length);
de.insert(dest, 0, 1);
de.copy(1, base.length - 1);
return tmp.toByteArray();
}
private void packHeader(TemporaryBuffer.Heap pack, int cnt)
throws IOException {
final byte[] hdr = new byte[8];
NB.encodeInt32(hdr, 0, 2);
NB.encodeInt32(hdr, 4, cnt);
pack.write(Constants.PACK_SIGNATURE);
pack.write(hdr, 0, 8);
}
private void objectHeader(TemporaryBuffer.Heap pack, int type, int sz)
throws IOException {
byte[] buf = new byte[8];
int nextLength = sz >>> 4;
buf[0] = (byte) ((nextLength > 0 ? 0x80 : 0x00) | (type << 4) | (sz & 0x0F));
sz = nextLength;
int n = 1;
while (sz > 0) {
nextLength >>>= 7;
buf[n++] = (byte) ((nextLength > 0 ? 0x80 : 0x00) | (sz & 0x7F));
sz = nextLength;
}
pack.write(buf, 0, n);
}
private void deflate(TemporaryBuffer.Heap pack, final byte[] content)
throws IOException {
final Deflater deflater = new Deflater();
final byte[] buf = new byte[128];
deflater.setInput(content, 0, content.length);
deflater.finish();
do {
final int n = deflater.deflate(buf, 0, buf.length);
if (n > 0)
pack.write(buf, 0, n);
} while (!deflater.finished());
deflater.end();
}
private void digest(TemporaryBuffer.Heap buf) throws IOException {
MessageDigest md = Constants.newMessageDigest();
md.update(buf.toByteArray());
buf.write(md.digest());
}
}