diff --git a/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/JGitTestUtil.java b/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/JGitTestUtil.java
index 2962e71..5bf61f0 100644
--- a/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/JGitTestUtil.java
+++ b/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/JGitTestUtil.java
@@ -258,4 +258,27 @@
 				target);
 	}
 
+	/**
+	 * Concatenate byte arrays.
+	 *
+	 * @param b
+	 *            byte arrays to combine together.
+	 * @return a single byte array that contains all bytes copied from input
+	 *         byte arrays.
+	 * @since 4.9
+	 */
+	public static byte[] concat(byte[]... b) {
+		int n = 0;
+		for (byte[] a : b) {
+			n += a.length;
+		}
+
+		byte[] data = new byte[n];
+		n = 0;
+		for (byte[] a : b) {
+			System.arraycopy(a, 0, data, n, a.length);
+			n += a.length;
+		}
+		return data;
+	}
 }
diff --git a/org.eclipse.jgit.test/META-INF/MANIFEST.MF b/org.eclipse.jgit.test/META-INF/MANIFEST.MF
index 0400f1e..670b42b 100644
--- a/org.eclipse.jgit.test/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.test/META-INF/MANIFEST.MF
@@ -23,6 +23,7 @@
  org.eclipse.jgit.ignore;version="[4.9.0,4.10.0)",
  org.eclipse.jgit.ignore.internal;version="[4.9.0,4.10.0)",
  org.eclipse.jgit.internal;version="[4.9.0,4.10.0)",
+ org.eclipse.jgit.internal.fsck;version="[4.9.0,4.10.0)",
  org.eclipse.jgit.internal.storage.dfs;version="[4.9.0,4.10.0)",
  org.eclipse.jgit.internal.storage.file;version="[4.9.0,4.10.0)",
  org.eclipse.jgit.internal.storage.pack;version="[4.9.0,4.10.0)",
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsFsckTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsFsckTest.java
new file mode 100644
index 0000000..804d744
--- /dev/null
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsFsckTest.java
@@ -0,0 +1,269 @@
+/*
+ * Copyright (C) 2017, 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.dfs;
+
+import static org.eclipse.jgit.junit.JGitTestUtil.concat;
+import static org.eclipse.jgit.lib.Constants.OBJECT_ID_LENGTH;
+import static org.eclipse.jgit.lib.Constants.encodeASCII;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import java.io.IOException;
+
+import org.eclipse.jgit.internal.fsck.FsckError;
+import org.eclipse.jgit.internal.fsck.FsckError.CorruptObject;
+import org.eclipse.jgit.junit.TestRepository;
+import org.eclipse.jgit.lib.Constants;
+import org.eclipse.jgit.lib.ObjectChecker.ErrorType;
+import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.lib.ObjectInserter;
+import org.eclipse.jgit.revwalk.RevCommit;
+import org.junit.Before;
+import org.junit.Test;
+
+public class DfsFsckTest {
+	private TestRepository<InMemoryRepository> git;
+
+	private InMemoryRepository repo;
+
+	private ObjectInserter ins;
+
+	@Before
+	public void setUp() throws IOException {
+		DfsRepositoryDescription desc = new DfsRepositoryDescription("test");
+		git = new TestRepository<>(new InMemoryRepository(desc));
+		repo = git.getRepository();
+		ins = repo.newObjectInserter();
+	}
+
+	@Test
+	public void testHealthyRepo() throws Exception {
+		RevCommit commit0 = git.commit().message("0").create();
+		RevCommit commit1 = git.commit().message("1").parent(commit0).create();
+		git.update("master", commit1);
+
+		DfsFsck fsck = new DfsFsck(repo);
+		FsckError errors = fsck.check(null);
+
+		assertEquals(errors.getCorruptObjects().size(), 0);
+		assertEquals(errors.getMissingObjects().size(), 0);
+		assertEquals(errors.getCorruptIndices().size(), 0);
+	}
+
+	@Test
+	public void testCommitWithCorruptAuthor() throws Exception {
+		StringBuilder b = new StringBuilder();
+		b.append("tree be9bfa841874ccc9f2ef7c48d0c76226f89b7189\n");
+		b.append("author b <b@c> <b@c> 0 +0000\n");
+		b.append("committer <> 0 +0000\n");
+		byte[] data = encodeASCII(b.toString());
+		ObjectId id = ins.insert(Constants.OBJ_COMMIT, data);
+		ins.flush();
+
+		DfsFsck fsck = new DfsFsck(repo);
+		FsckError errors = fsck.check(null);
+
+		assertEquals(errors.getCorruptObjects().size(), 1);
+		CorruptObject o = errors.getCorruptObjects().iterator().next();
+		assertTrue(o.getId().equals(id));
+		assertEquals(o.getErrorType(), ErrorType.BAD_DATE);
+	}
+
+	@Test
+	public void testCommitWithoutTree() throws Exception {
+		StringBuilder b = new StringBuilder();
+		b.append("parent ");
+		b.append("be9bfa841874ccc9f2ef7c48d0c76226f89b7189");
+		b.append('\n');
+		byte[] data = encodeASCII(b.toString());
+		ObjectId id = ins.insert(Constants.OBJ_COMMIT, data);
+		ins.flush();
+
+		DfsFsck fsck = new DfsFsck(repo);
+		FsckError errors = fsck.check(null);
+
+		assertEquals(errors.getCorruptObjects().size(), 1);
+		CorruptObject o = errors.getCorruptObjects().iterator().next();
+		assertTrue(o.getId().equals(id));
+		assertEquals(o.getErrorType(), ErrorType.MISSING_TREE);
+	}
+
+	@Test
+	public void testTagWithoutObject() throws Exception {
+		StringBuilder b = new StringBuilder();
+		b.append("type commit\n");
+		b.append("tag test-tag\n");
+		b.append("tagger A. U. Thor <author@localhost> 1 +0000\n");
+		byte[] data = encodeASCII(b.toString());
+		ObjectId id = ins.insert(Constants.OBJ_TAG, data);
+		ins.flush();
+
+		DfsFsck fsck = new DfsFsck(repo);
+		FsckError errors = fsck.check(null);
+
+		assertEquals(errors.getCorruptObjects().size(), 1);
+		CorruptObject o = errors.getCorruptObjects().iterator().next();
+		assertTrue(o.getId().equals(id));
+		assertEquals(o.getErrorType(), ErrorType.MISSING_OBJECT);
+	}
+
+	@Test
+	public void testTreeWithNullSha() throws Exception {
+		byte[] data = concat(encodeASCII("100644 A"), new byte[] { '\0' },
+				new byte[OBJECT_ID_LENGTH]);
+		ObjectId id = ins.insert(Constants.OBJ_TREE, data);
+		ins.flush();
+
+		DfsFsck fsck = new DfsFsck(repo);
+		FsckError errors = fsck.check(null);
+
+		assertEquals(errors.getCorruptObjects().size(), 1);
+		CorruptObject o = errors.getCorruptObjects().iterator().next();
+		assertTrue(o.getId().equals(id));
+		assertEquals(o.getErrorType(), ErrorType.NULL_SHA1);
+	}
+
+	@Test
+	public void testMultipleInvalidObjects() throws Exception {
+		StringBuilder b = new StringBuilder();
+		b.append("tree ");
+		b.append("be9bfa841874ccc9f2ef7c48d0c76226f89b7189");
+		b.append('\n');
+		b.append("parent ");
+		b.append("\n");
+		byte[] data = encodeASCII(b.toString());
+		ObjectId id1 = ins.insert(Constants.OBJ_COMMIT, data);
+
+		b = new StringBuilder();
+		b.append("100644");
+		data = encodeASCII(b.toString());
+		ObjectId id2 = ins.insert(Constants.OBJ_TREE, data);
+
+		ins.flush();
+
+		DfsFsck fsck = new DfsFsck(repo);
+		FsckError errors = fsck.check(null);
+
+		assertEquals(errors.getCorruptObjects().size(), 2);
+		for (CorruptObject o : errors.getCorruptObjects()) {
+			if (o.getId().equals(id1)) {
+				assertEquals(o.getErrorType(), ErrorType.BAD_PARENT_SHA1);
+			} else if (o.getId().equals(id2)) {
+				assertNull(o.getErrorType());
+			} else {
+				fail();
+			}
+		}
+	}
+
+	@Test
+	public void testValidConnectivity() throws Exception {
+		ObjectId blobId = ins
+				.insert(Constants.OBJ_BLOB, Constants.encode("foo"));
+
+		byte[] blobIdBytes = new byte[OBJECT_ID_LENGTH];
+		blobId.copyRawTo(blobIdBytes, 0);
+		byte[] data = concat(encodeASCII("100644 regular-file\0"), blobIdBytes);
+		ObjectId treeId = ins.insert(Constants.OBJ_TREE, data);
+		ins.flush();
+
+		RevCommit commit = git.commit().message("0").setTopLevelTree(treeId)
+				.create();
+
+		git.update("master", commit);
+
+		DfsFsck fsck = new DfsFsck(repo);
+		FsckError errors = fsck.check(null);
+		assertEquals(errors.getMissingObjects().size(), 0);
+	}
+
+	@Test
+	public void testMissingObject() throws Exception {
+		ObjectId blobId = ObjectId
+				.fromString("19102815663d23f8b75a47e7a01965dcdc96468c");
+		byte[] blobIdBytes = new byte[OBJECT_ID_LENGTH];
+		blobId.copyRawTo(blobIdBytes, 0);
+		byte[] data = concat(encodeASCII("100644 regular-file\0"), blobIdBytes);
+		ObjectId treeId = ins.insert(Constants.OBJ_TREE, data);
+		ins.flush();
+
+		RevCommit commit = git.commit().message("0").setTopLevelTree(treeId)
+				.create();
+
+		git.update("master", commit);
+
+		DfsFsck fsck = new DfsFsck(repo);
+		FsckError errors = fsck.check(null);
+		assertEquals(errors.getMissingObjects().size(), 1);
+		assertEquals(errors.getMissingObjects().iterator().next(), blobId);
+	}
+
+	@Test
+	public void testNonCommitHead() throws Exception {
+		RevCommit commit0 = git.commit().message("0").create();
+		StringBuilder b = new StringBuilder();
+		b.append("object ");
+		b.append(commit0.getName());
+		b.append('\n');
+		b.append("type commit\n");
+		b.append("tag test-tag\n");
+		b.append("tagger A. U. Thor <author@localhost> 1 +0000\n");
+
+		byte[] data = encodeASCII(b.toString());
+		ObjectId tagId = ins.insert(Constants.OBJ_TAG, data);
+		ins.flush();
+
+		git.update("master", tagId);
+
+		DfsFsck fsck = new DfsFsck(repo);
+		FsckError errors = fsck.check(null);
+		assertEquals(errors.getCorruptObjects().size(), 0);
+		assertEquals(errors.getNonCommitHeads().size(), 1);
+		assertEquals(errors.getNonCommitHeads().iterator().next(),
+				"refs/heads/master");
+	}
+
+}
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/ObjectCheckerTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/ObjectCheckerTest.java
index 43160fb..c8729d9 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/ObjectCheckerTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/ObjectCheckerTest.java
@@ -45,6 +45,7 @@
 package org.eclipse.jgit.lib;
 
 import static java.lang.Integer.valueOf;
+import static org.eclipse.jgit.junit.JGitTestUtil.concat;
 import static org.eclipse.jgit.lib.Constants.OBJECT_ID_LENGTH;
 import static org.eclipse.jgit.lib.Constants.OBJ_BAD;
 import static org.eclipse.jgit.lib.Constants.OBJ_BLOB;
@@ -1054,20 +1055,7 @@
 		checker.checkTree(data);
 	}
 
-	private static byte[] concat(byte[]... b) {
-		int n = 0;
-		for (byte[] a : b) {
-			n += a.length;
-		}
 
-		byte[] data = new byte[n];
-		n = 0;
-		for (byte[] a : b) {
-			System.arraycopy(a, 0, data, n, a.length);
-			n += a.length;
-		}
-		return data;
-	}
 
 	@Test
 	public void testInvalidTreeNameIsMacHFSGitCorruptUTF8AtEnd()
diff --git a/org.eclipse.jgit/META-INF/MANIFEST.MF b/org.eclipse.jgit/META-INF/MANIFEST.MF
index 478071f..4719ceb 100644
--- a/org.eclipse.jgit/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit/META-INF/MANIFEST.MF
@@ -59,6 +59,7 @@
  org.eclipse.jgit.ignore;version="4.9.0",
  org.eclipse.jgit.ignore.internal;version="4.9.0";x-friends:="org.eclipse.jgit.test",
  org.eclipse.jgit.internal;version="4.9.0";x-friends:="org.eclipse.jgit.test,org.eclipse.jgit.http.test",
+ org.eclipse.jgit.internal.fsck;version="4.9.0";x-friends:="org.eclipse.jgit.test",
  org.eclipse.jgit.internal.ketch;version="4.9.0";x-friends:="org.eclipse.jgit.junit,org.eclipse.jgit.test,org.eclipse.jgit.pgm",
  org.eclipse.jgit.internal.storage.dfs;version="4.9.0";
   x-friends:="org.eclipse.jgit.test,
diff --git a/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties b/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties
index 6e793da..fc29f48 100644
--- a/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties
+++ b/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties
@@ -409,8 +409,11 @@
 mergeRecursiveTooManyMergeBasesFor = "More than {0} merge bases for:\n a {1}\n b {2} found:\n  count {3}"
 messageAndTaggerNotAllowedInUnannotatedTags = Unannotated tags cannot have a message or tagger
 minutesAgo={0} minutes ago
+mismatchOffset=mismatch offset for object {0}
+mismatchCRC=mismatch CRC for object {0}
 missingAccesskey=Missing accesskey.
 missingConfigurationForKey=No value for key {0} found in configuration
+missingCRC=missing CRC for object {0}
 missingDeltaBase=delta base
 missingForwardImageInGITBinaryPatch=Missing forward-image in GIT binary patch
 missingObject=Missing {0} {1}
@@ -667,6 +670,7 @@
 unknownHost=unknown host
 unknownIndexVersionOrCorruptIndex=Unknown index version (or corrupt index): {0}
 unknownObject=unknown object
+unknownObjectInIndex=unknown object {0} found in index but not in pack file
 unknownObjectType=Unknown object type {0}.
 unknownObjectType2=unknown
 unknownRepositoryFormat=Unknown repository format
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/errors/CorruptPackIndexException.java b/org.eclipse.jgit/src/org/eclipse/jgit/errors/CorruptPackIndexException.java
new file mode 100644
index 0000000..65d83b3
--- /dev/null
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/errors/CorruptPackIndexException.java
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2017, 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.errors;
+
+import org.eclipse.jgit.annotations.Nullable;
+
+/**
+ * Exception thrown when encounters a corrupt pack index file.
+ *
+ * @since 4.9
+ */
+public class CorruptPackIndexException extends Exception {
+	private static final long serialVersionUID = 1L;
+
+	/** The error type of a corrupt index file. */
+	public enum ErrorType {
+		/** Offset does not match index in pack file. */
+		MISMATCH_OFFSET,
+		/** CRC does not match CRC of the object data in pack file. */
+		MISMATCH_CRC,
+		/** CRC is not present in index file. */
+		MISSING_CRC,
+		/** Object in pack is not present in index file. */
+		MISSING_OBJ,
+		/** Object in index file is not present in pack file. */
+		UNKNOWN_OBJ,
+	}
+
+	private ErrorType errorType;
+
+	/**
+	 * Report a specific error condition discovered in an index file.
+	 *
+	 * @param message
+	 *            the error message.
+	 * @param errorType
+	 *            the error type of corruption.
+	 */
+	public CorruptPackIndexException(String message, ErrorType errorType) {
+		super(message);
+		this.errorType = errorType;
+	}
+
+	/**
+	 * Specific the reason of the corrupt index file.
+	 *
+	 * @return error condition or null.
+	 */
+	@Nullable
+	public ErrorType getErrorType() {
+		return errorType;
+	}
+}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java
index ea752b9..a68f839 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java
@@ -468,8 +468,11 @@
 	/***/ public String mergeRecursiveTooManyMergeBasesFor;
 	/***/ public String messageAndTaggerNotAllowedInUnannotatedTags;
 	/***/ public String minutesAgo;
+	/***/ public String mismatchOffset;
+	/***/ public String mismatchCRC;
 	/***/ public String missingAccesskey;
 	/***/ public String missingConfigurationForKey;
+	/***/ public String missingCRC;
 	/***/ public String missingDeltaBase;
 	/***/ public String missingForwardImageInGITBinaryPatch;
 	/***/ public String missingObject;
@@ -726,6 +729,7 @@
 	/***/ public String unknownHost;
 	/***/ public String unknownIndexVersionOrCorruptIndex;
 	/***/ public String unknownObject;
+	/***/ public String unknownObjectInIndex;
 	/***/ public String unknownObjectType;
 	/***/ public String unknownObjectType2;
 	/***/ public String unknownRepositoryFormat;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/fsck/FsckError.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/fsck/FsckError.java
new file mode 100644
index 0000000..588ed9b
--- /dev/null
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/fsck/FsckError.java
@@ -0,0 +1,152 @@
+/*
+ * Copyright (C) 2017, 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.fsck;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.eclipse.jgit.annotations.Nullable;
+import org.eclipse.jgit.errors.CorruptPackIndexException;
+import org.eclipse.jgit.errors.CorruptPackIndexException.ErrorType;
+import org.eclipse.jgit.lib.ObjectChecker;
+import org.eclipse.jgit.lib.ObjectId;
+
+/** Holds all fsck errors of a git repository. */
+public class FsckError {
+	/** Represents a corrupt object. */
+	public static class CorruptObject {
+		final ObjectId id;
+
+		final int type;
+
+		ObjectChecker.ErrorType errorType;
+
+		/**
+		 * @param id
+		 *            the object identifier.
+		 * @param type
+		 *            type of the object.
+		 */
+		public CorruptObject(ObjectId id, int type) {
+			this.id = id;
+			this.type = type;
+		}
+
+		void setErrorType(ObjectChecker.ErrorType errorType) {
+			this.errorType = errorType;
+		}
+
+		/** @return identifier of the object. */
+		public ObjectId getId() {
+			return id;
+		}
+
+		/** @return type of the object. */
+		public int getType() {
+			return type;
+		}
+
+		/** @return error type of the corruption. */
+		@Nullable
+		public ObjectChecker.ErrorType getErrorType() {
+			return errorType;
+		}
+	}
+
+	/** Represents a corrupt pack index file. */
+	public static class CorruptIndex {
+		String fileName;
+
+		CorruptPackIndexException.ErrorType errorType;
+
+		/**
+		 * @param fileName
+		 *            the file name of the pack index.
+		 * @param errorType
+		 *            the type of error as reported in
+		 *            {@link CorruptPackIndexException}.
+		 */
+		public CorruptIndex(String fileName, ErrorType errorType) {
+			this.fileName = fileName;
+			this.errorType = errorType;
+		}
+
+		/** @return the file name of the index file. */
+		public String getFileName() {
+			return fileName;
+		}
+
+		/** @return the error type of the corruption. */
+		public ErrorType getErrorType() {
+			return errorType;
+		}
+	}
+
+	private final Set<CorruptObject> corruptObjects = new HashSet<>();
+
+	private final Set<ObjectId> missingObjects = new HashSet<>();
+
+	private final Set<CorruptIndex> corruptIndices = new HashSet<>();
+
+	private final Set<String> nonCommitHeads = new HashSet<>();
+
+	/** @return corrupt objects from all pack files. */
+	public Set<CorruptObject> getCorruptObjects() {
+		return corruptObjects;
+	}
+
+	/** @return missing objects that should present in pack files. */
+	public Set<ObjectId> getMissingObjects() {
+		return missingObjects;
+	}
+
+	/** @return corrupt index files associated with the packs. */
+	public Set<CorruptIndex> getCorruptIndices() {
+		return corruptIndices;
+	}
+
+	/** @return refs/heads/* point to non-commit object. */
+	public Set<String> getNonCommitHeads() {
+		return nonCommitHeads;
+	}
+}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/fsck/FsckPackParser.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/fsck/FsckPackParser.java
new file mode 100644
index 0000000..e6ec681
--- /dev/null
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/fsck/FsckPackParser.java
@@ -0,0 +1,326 @@
+/*
+ * Copyright (C) 2017, 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.fsck;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.Channels;
+import java.text.MessageFormat;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.zip.CRC32;
+
+import org.eclipse.jgit.errors.CorruptObjectException;
+import org.eclipse.jgit.errors.CorruptPackIndexException;
+import org.eclipse.jgit.errors.CorruptPackIndexException.ErrorType;
+import org.eclipse.jgit.errors.MissingObjectException;
+import org.eclipse.jgit.internal.JGitText;
+import org.eclipse.jgit.internal.fsck.FsckError.CorruptObject;
+import org.eclipse.jgit.internal.storage.dfs.ReadableChannel;
+import org.eclipse.jgit.internal.storage.file.PackIndex;
+import org.eclipse.jgit.internal.storage.file.PackIndex.MutableEntry;
+import org.eclipse.jgit.lib.AnyObjectId;
+import org.eclipse.jgit.lib.ObjectChecker;
+import org.eclipse.jgit.lib.ObjectDatabase;
+import org.eclipse.jgit.transport.PackParser;
+import org.eclipse.jgit.transport.PackedObjectInfo;
+
+/** A read-only pack parser for object validity checking. */
+public class FsckPackParser extends PackParser {
+	private final CRC32 crc;
+
+	private final ReadableChannel channel;
+
+	private final Set<CorruptObject> corruptObjects = new HashSet<>();
+
+	private long expectedObjectCount = -1L;
+
+	private long offset;
+
+	private int blockSize;
+
+	/**
+	 * @param db
+	 *            the object database which stores repository's data.
+	 * @param channel
+	 *            readable channel of the pack file.
+	 */
+	public FsckPackParser(ObjectDatabase db, ReadableChannel channel) {
+		super(db, Channels.newInputStream(channel));
+		this.channel = channel;
+		setCheckObjectCollisions(false);
+		this.crc = new CRC32();
+		this.blockSize = channel.blockSize() > 0 ? channel.blockSize() : 65536;
+	}
+
+	@Override
+	protected void onPackHeader(long objCnt) throws IOException {
+		if (expectedObjectCount >= 0) {
+			// Some DFS pack files don't contain the correct object count, e.g.
+			// INSERT/RECEIVE packs don't always contain the correct object
+			// count in their headers. Overwrite the expected object count
+			// after parsing the pack header.
+			setExpectedObjectCount(expectedObjectCount);
+		}
+	}
+
+	@Override
+	protected void onBeginWholeObject(long streamPosition, int type,
+			long inflatedSize) throws IOException {
+		crc.reset();
+	}
+
+	@Override
+	protected void onObjectHeader(Source src, byte[] raw, int pos, int len)
+			throws IOException {
+		crc.update(raw, pos, len);
+	}
+
+	@Override
+	protected void onObjectData(Source src, byte[] raw, int pos, int len)
+			throws IOException {
+		crc.update(raw, pos, len);
+	}
+
+	@Override
+	protected void onEndWholeObject(PackedObjectInfo info) throws IOException {
+		info.setCRC((int) crc.getValue());
+	}
+
+	@Override
+	protected void onBeginOfsDelta(long deltaStreamPosition,
+			long baseStreamPosition, long inflatedSize) throws IOException {
+		crc.reset();
+	}
+
+	@Override
+	protected void onBeginRefDelta(long deltaStreamPosition, AnyObjectId baseId,
+			long inflatedSize) throws IOException {
+		crc.reset();
+	}
+
+	@Override
+	protected UnresolvedDelta onEndDelta() throws IOException {
+		UnresolvedDelta delta = new UnresolvedDelta();
+		delta.setCRC((int) crc.getValue());
+		return delta;
+	}
+
+	@Override
+	protected void onInflatedObjectData(PackedObjectInfo obj, int typeCode,
+			byte[] data) throws IOException {
+		// FsckPackParser ignores this event.
+	}
+
+	@Override
+	protected void verifySafeObject(final AnyObjectId id, final int type,
+			final byte[] data) {
+		try {
+			super.verifySafeObject(id, type, data);
+		} catch (CorruptObjectException e) {
+			// catch the exception and continue parse the pack file
+			CorruptObject o = new CorruptObject(id.toObjectId(), type);
+			if (e.getErrorType() != null) {
+				o.setErrorType(e.getErrorType());
+			}
+			corruptObjects.add(o);
+		}
+	}
+
+	@Override
+	protected void onPackFooter(byte[] hash) throws IOException {
+	}
+
+	@Override
+	protected boolean onAppendBase(int typeCode, byte[] data,
+			PackedObjectInfo info) throws IOException {
+		// Do nothing.
+		return false;
+	}
+
+	@Override
+	protected void onEndThinPack() throws IOException {
+	}
+
+	@Override
+	protected ObjectTypeAndSize seekDatabase(PackedObjectInfo obj,
+			ObjectTypeAndSize info) throws IOException {
+		crc.reset();
+		offset = obj.getOffset();
+		return readObjectHeader(info);
+	}
+
+	@Override
+	protected ObjectTypeAndSize seekDatabase(UnresolvedDelta delta,
+			ObjectTypeAndSize info) throws IOException {
+		crc.reset();
+		offset = delta.getOffset();
+		return readObjectHeader(info);
+	}
+
+	@Override
+	protected int readDatabase(byte[] dst, int pos, int cnt)
+			throws IOException {
+		// read from input instead of database.
+		int n = read(offset, dst, pos, cnt);
+		if (n > 0) {
+			offset += n;
+		}
+		return n;
+	}
+
+	int read(long channelPosition, byte[] dst, int pos, int cnt)
+			throws IOException {
+		long block = channelPosition / blockSize;
+		byte[] bytes = readFromChannel(block);
+		if (bytes == null) {
+			return -1;
+		}
+		int offset = (int) (channelPosition - block * blockSize);
+		int bytesToCopy = Math.min(cnt, bytes.length - offset);
+		if (bytesToCopy < 1) {
+			return -1;
+		}
+		System.arraycopy(bytes, offset, dst, pos, bytesToCopy);
+		return bytesToCopy;
+	}
+
+	private byte[] readFromChannel(long block) throws IOException {
+		channel.position(block * blockSize);
+		ByteBuffer buf = ByteBuffer.allocate(blockSize);
+		int totalBytesRead = 0;
+		while (totalBytesRead < blockSize) {
+			int bytesRead = channel.read(buf);
+			if (bytesRead == -1) {
+				if (totalBytesRead == 0) {
+					return null;
+				}
+				return Arrays.copyOf(buf.array(), totalBytesRead);
+			}
+			totalBytesRead += bytesRead;
+		}
+		return buf.array();
+	}
+
+	@Override
+	protected boolean checkCRC(int oldCRC) {
+		return oldCRC == (int) crc.getValue();
+	}
+
+	@Override
+	protected void onStoreStream(byte[] raw, int pos, int len)
+			throws IOException {
+	}
+
+	/**
+	 * @return corrupt objects that reported by {@link ObjectChecker}.
+	 */
+	public Set<CorruptObject> getCorruptObjects() {
+		return corruptObjects;
+	}
+
+	/**
+	 * Verify the existing index file with all objects from the pack.
+	 *
+	 * @param entries
+	 *            all the entries that are expected in the index file
+	 * @param idx
+	 *            index file associate with the pack
+	 * @throws CorruptPackIndexException
+	 *             when the index file is corrupt.
+	 */
+	public void verifyIndex(List<PackedObjectInfo> entries, PackIndex idx)
+			throws CorruptPackIndexException {
+		Set<String> all = new HashSet<>();
+		for (PackedObjectInfo entry : entries) {
+			all.add(entry.getName());
+			long offset = idx.findOffset(entry);
+			if (offset == -1) {
+				throw new CorruptPackIndexException(
+						MessageFormat.format(JGitText.get().missingObject,
+								entry.getType(), entry.getName()),
+						ErrorType.MISSING_OBJ);
+			} else if (offset != entry.getOffset()) {
+				throw new CorruptPackIndexException(MessageFormat
+						.format(JGitText.get().mismatchOffset, entry.getName()),
+						ErrorType.MISMATCH_OFFSET);
+			}
+
+			try {
+				if (idx.hasCRC32Support()
+						&& (int) idx.findCRC32(entry) != entry.getCRC()) {
+					throw new CorruptPackIndexException(
+							MessageFormat.format(JGitText.get().mismatchCRC,
+									entry.getName()),
+							ErrorType.MISMATCH_CRC);
+				}
+			} catch (MissingObjectException e) {
+				throw new CorruptPackIndexException(MessageFormat
+						.format(JGitText.get().missingCRC, entry.getName()),
+						ErrorType.MISSING_CRC);
+			}
+		}
+
+		for (MutableEntry entry : idx) {
+			if (!all.contains(entry.name())) {
+				throw new CorruptPackIndexException(MessageFormat.format(
+						JGitText.get().unknownObjectInIndex, entry.name()),
+						ErrorType.UNKNOWN_OBJ);
+			}
+		}
+	}
+
+	/**
+	 * Set the object count for overwriting the expected object count from pack
+	 * header.
+	 *
+	 * @param expectedObjectCount
+	 *            the actual expected object count.
+	 */
+	public void overwriteObjectCount(long expectedObjectCount) {
+		this.expectedObjectCount = expectedObjectCount;
+	}
+}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/fsck/package-info.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/fsck/package-info.java
new file mode 100644
index 0000000..361b61f
--- /dev/null
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/fsck/package-info.java
@@ -0,0 +1,4 @@
+/**
+ * Git fsck support.
+ */
+package org.eclipse.jgit.internal.fsck;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsFsck.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsFsck.java
new file mode 100644
index 0000000..f90ba7d
--- /dev/null
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsFsck.java
@@ -0,0 +1,158 @@
+/*
+ * Copyright (C) 2017, 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.dfs;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.eclipse.jgit.errors.CorruptPackIndexException;
+import org.eclipse.jgit.errors.MissingObjectException;
+import org.eclipse.jgit.internal.fsck.FsckError;
+import org.eclipse.jgit.internal.fsck.FsckError.CorruptIndex;
+import org.eclipse.jgit.internal.fsck.FsckPackParser;
+import org.eclipse.jgit.internal.storage.pack.PackExt;
+import org.eclipse.jgit.lib.Constants;
+import org.eclipse.jgit.lib.ObjectChecker;
+import org.eclipse.jgit.lib.ProgressMonitor;
+import org.eclipse.jgit.lib.Ref;
+import org.eclipse.jgit.revwalk.ObjectWalk;
+import org.eclipse.jgit.revwalk.RevObject;
+import org.eclipse.jgit.transport.PackedObjectInfo;
+
+/** Verify the validity and connectivity of a DFS repository. */
+public class DfsFsck {
+	private final DfsRepository repo;
+
+	private final DfsObjDatabase objdb;
+
+	private final DfsReader ctx;
+
+	private ObjectChecker objChecker = new ObjectChecker();
+
+	/**
+	 * Initialize DFS fsck.
+	 *
+	 * @param repository
+	 *            the dfs repository to check.
+	 */
+	public DfsFsck(DfsRepository repository) {
+		repo = repository;
+		objdb = repo.getObjectDatabase();
+		ctx = objdb.newReader();
+	}
+
+
+	/**
+	 * Verify the integrity and connectivity of all objects in the object
+	 * database.
+	 *
+	 * @param pm
+	 *            callback to provide progress feedback during the check.
+	 * @return all errors about the repository.
+	 * @throws IOException
+	 *             if encounters IO errors during the process.
+	 */
+	public FsckError check(ProgressMonitor pm) throws IOException {
+		FsckError errors = new FsckError();
+		try {
+			for (DfsPackFile pack : objdb.getPacks()) {
+				DfsPackDescription packDesc = pack.getPackDescription();
+				try (ReadableChannel channel = repo.getObjectDatabase()
+						.openFile(packDesc, PackExt.PACK)) {
+					List<PackedObjectInfo> objectsInPack;
+					FsckPackParser parser = new FsckPackParser(
+							repo.getObjectDatabase(), channel);
+					parser.setObjectChecker(objChecker);
+					parser.overwriteObjectCount(packDesc.getObjectCount());
+					parser.parse(pm);
+					errors.getCorruptObjects()
+							.addAll(parser.getCorruptObjects());
+					objectsInPack = parser.getSortedObjectList(null);
+					parser.verifyIndex(objectsInPack, pack.getPackIndex(ctx));
+				} catch (MissingObjectException e) {
+					errors.getMissingObjects().add(e.getObjectId());
+				} catch (CorruptPackIndexException e) {
+					errors.getCorruptIndices().add(new CorruptIndex(
+							pack.getPackDescription()
+									.getFileName(PackExt.INDEX),
+							e.getErrorType()));
+				}
+			}
+
+			try (ObjectWalk ow = new ObjectWalk(ctx)) {
+				for (Ref r : repo.getAllRefs().values()) {
+					try {
+						RevObject tip = ow.parseAny(r.getObjectId());
+						if (r.getLeaf().getName().startsWith(Constants.R_HEADS)) {
+							// check if heads point to a commit object
+							if (tip.getType() != Constants.OBJ_COMMIT) {
+								errors.getNonCommitHeads()
+										.add(r.getLeaf().getName());
+							}
+						}
+						ow.markStart(tip);
+						ow.checkConnectivity();
+						ow.markUninteresting(tip);
+					} catch (MissingObjectException e) {
+						errors.getMissingObjects().add(e.getObjectId());
+					}
+				}
+			}
+		} finally {
+			ctx.close();
+		}
+		return errors;
+	}
+
+	/**
+	 * Use a customized object checker instead of the default one. Caller can
+	 * specify a skip list to ignore some errors.
+	 *
+	 * @param objChecker
+	 *            A customized object checker.
+	 */
+	public void setObjectChecker(ObjectChecker objChecker) {
+		this.objChecker = objChecker;
+	}
+}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackParser.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackParser.java
index 19dfa34..db3578b 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackParser.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackParser.java
@@ -550,29 +550,7 @@
 			}
 
 			if (deltaCount > 0) {
-				if (resolving instanceof BatchingProgressMonitor) {
-					((BatchingProgressMonitor) resolving).setDelayStart(
-							1000,
-							TimeUnit.MILLISECONDS);
-				}
-				resolving.beginTask(JGitText.get().resolvingDeltas, deltaCount);
-				resolveDeltas(resolving);
-				if (entryCount < expectedObjectCount) {
-					if (!isAllowThin()) {
-						throw new IOException(MessageFormat.format(
-								JGitText.get().packHasUnresolvedDeltas,
-								Long.valueOf(expectedObjectCount - entryCount)));
-					}
-
-					resolveDeltasWithExternalBases(resolving);
-
-					if (entryCount < expectedObjectCount) {
-						throw new IOException(MessageFormat.format(
-								JGitText.get().packHasUnresolvedDeltas,
-								Long.valueOf(expectedObjectCount - entryCount)));
-					}
-				}
-				resolving.endTask();
+				processDeltas(resolving);
 			}
 
 			packDigest = null;
@@ -595,6 +573,31 @@
 		return null; // By default there is no locking.
 	}
 
+	private void processDeltas(ProgressMonitor resolving) throws IOException {
+		if (resolving instanceof BatchingProgressMonitor) {
+			((BatchingProgressMonitor) resolving).setDelayStart(1000,
+					TimeUnit.MILLISECONDS);
+		}
+		resolving.beginTask(JGitText.get().resolvingDeltas, deltaCount);
+		resolveDeltas(resolving);
+		if (entryCount < expectedObjectCount) {
+			if (!isAllowThin()) {
+				throw new IOException(MessageFormat.format(
+						JGitText.get().packHasUnresolvedDeltas,
+						Long.valueOf(expectedObjectCount - entryCount)));
+			}
+
+			resolveDeltasWithExternalBases(resolving);
+
+			if (entryCount < expectedObjectCount) {
+				throw new IOException(MessageFormat.format(
+						JGitText.get().packHasUnresolvedDeltas,
+						Long.valueOf(expectedObjectCount - entryCount)));
+			}
+		}
+		resolving.endTask();
+	}
+
 	private void resolveDeltas(final ProgressMonitor progress)
 			throws IOException {
 		final int last = entryCount;
@@ -684,6 +687,7 @@
 			PackedObjectInfo oe;
 			oe = newInfo(tempObjectId, visit.delta, visit.parent.id);
 			oe.setOffset(visit.delta.position);
+			oe.setType(type);
 			onInflatedObjectData(oe, type, visit.data);
 			addObjectAndTrack(oe);
 			visit.id = oe;
@@ -854,10 +858,9 @@
 			visit.id = baseId;
 			final int typeCode = ldr.getType();
 			final PackedObjectInfo oe = newInfo(baseId, null, null);
-
+			oe.setType(typeCode);
 			if (onAppendBase(typeCode, visit.data, oe))
 				entries[entryCount++] = oe;
-
 			visit.nextChild = firstChildOf(oe);
 			resolveDeltas(visit.next(), typeCode,
 					new ObjectTypeAndSize(), progress);
@@ -1059,6 +1062,7 @@
 
 		PackedObjectInfo obj = newInfo(tempObjectId, null, null);
 		obj.setOffset(pos);
+		obj.setType(type);
 		onEndWholeObject(obj);
 		if (data != null)
 			onInflatedObjectData(obj, type, data);
@@ -1069,8 +1073,21 @@
 		}
 	}
 
-	private void verifySafeObject(final AnyObjectId id, final int type,
-			final byte[] data) throws IOException {
+	/**
+	 * Verify the integrity of the object.
+	 *
+	 * @param id
+	 *            identity of the object to be checked.
+	 * @param type
+	 *            the type of the object.
+	 * @param data
+	 *            raw content of the object.
+	 * @throws CorruptObjectException
+	 * @since 4.9
+	 *
+	 */
+	protected void verifySafeObject(final AnyObjectId id, final int type,
+			final byte[] data) throws CorruptObjectException {
 		if (objCheck != null) {
 			try {
 				objCheck.check(id, type, data);
@@ -1078,11 +1095,11 @@
 				if (e.getErrorType() != null) {
 					throw e;
 				}
-				throw new CorruptObjectException(MessageFormat.format(
-						JGitText.get().invalidObject,
-						Constants.typeString(type),
-						id.name(),
-						e.getMessage()), e);
+				throw new CorruptObjectException(
+						MessageFormat.format(JGitText.get().invalidObject,
+								Constants.typeString(type), id.name(),
+								e.getMessage()),
+						e);
 			}
 		}
 	}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackedObjectInfo.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackedObjectInfo.java
index 6da1c57..381c228 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackedObjectInfo.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackedObjectInfo.java
@@ -45,6 +45,7 @@
 package org.eclipse.jgit.transport;
 
 import org.eclipse.jgit.lib.AnyObjectId;
+import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.ObjectIdOwnerMap;
 
 /**
@@ -59,6 +60,8 @@
 
 	private int crc;
 
+	private int type = Constants.OBJ_BAD;
+
 	PackedObjectInfo(final long headerOffset, final int packedCRC,
 			final AnyObjectId id) {
 		super(id);
@@ -112,4 +115,24 @@
 	public void setCRC(final int crc) {
 		this.crc = crc;
 	}
+
+	/**
+	 * @return the object type. The default type is OBJ_BAD, which is considered
+	 *         as unknown or invalid type.
+	 * @since 4.9
+	 */
+	public int getType() {
+		return type;
+	}
+
+	/**
+	 * Record the object type if applicable.
+	 *
+	 * @param type
+	 *            the object type.
+	 * @since 4.9
+	 */
+	public void setType(int type) {
+		this.type = type;
+	}
 }