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From j...@apache.org
Subject kafka git commit: KAFKA-1449; Use CRC32C for checksum of V2 message format
Date Wed, 29 Mar 2017 18:24:04 GMT
Repository: kafka
Updated Branches:
  refs/heads/trunk aea5989d9 -> 6feaa8a58


KAFKA-1449; Use CRC32C for checksum of V2 message format

I manually tested that Crc32CTest and AbstractChecksums pass with JDK 9. I also verified that `Java9ChecksumFactory` is used in that case.

Author: Ismael Juma <ismael@juma.me.uk>

Reviewers: Jason Gustafson <jason@confluent.io>

Closes #2739 from ijuma/kafka-1449-crc32c


Project: http://git-wip-us.apache.org/repos/asf/kafka/repo
Commit: http://git-wip-us.apache.org/repos/asf/kafka/commit/6feaa8a5
Tree: http://git-wip-us.apache.org/repos/asf/kafka/tree/6feaa8a5
Diff: http://git-wip-us.apache.org/repos/asf/kafka/diff/6feaa8a5

Branch: refs/heads/trunk
Commit: 6feaa8a581daaa76ff7c85e4a0b9c9aa4284fe99
Parents: aea5989
Author: Ismael Juma <ismael@juma.me.uk>
Authored: Wed Mar 29 11:10:43 2017 -0700
Committer: Jason Gustafson <jason@confluent.io>
Committed: Wed Mar 29 11:10:43 2017 -0700

----------------------------------------------------------------------
 .../kafka/common/record/DefaultRecord.java      |  12 +-
 .../kafka/common/record/DefaultRecordBatch.java |  16 +-
 .../kafka/common/record/LegacyRecord.java       |  15 +-
 .../apache/kafka/common/utils/Checksums.java    |  67 ++
 .../org/apache/kafka/common/utils/Crc32.java    |  37 +-
 .../org/apache/kafka/common/utils/Crc32C.java   | 112 ++++
 .../org/apache/kafka/common/utils/Java.java     |  44 ++
 .../kafka/common/utils/PureJavaCrc32C.java      | 644 +++++++++++++++++++
 .../kafka/common/record/FileRecordsTest.java    |  19 +-
 .../kafka/common/record/MemoryRecordsTest.java  |  52 +-
 .../common/record/SimpleLegacyRecordTest.java   |   4 +-
 .../kafka/common/utils/ChecksumsTest.java       |  93 +++
 .../apache/kafka/common/utils/Crc32CTest.java   |  52 ++
 .../apache/kafka/common/utils/Crc32Test.java    |  51 +-
 .../org/apache/kafka/common/utils/CrcTest.java  |  59 --
 15 files changed, 1127 insertions(+), 150 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/kafka/blob/6feaa8a5/clients/src/main/java/org/apache/kafka/common/record/DefaultRecord.java
----------------------------------------------------------------------
diff --git a/clients/src/main/java/org/apache/kafka/common/record/DefaultRecord.java b/clients/src/main/java/org/apache/kafka/common/record/DefaultRecord.java
index 7c9b6f1..7c8dee5 100644
--- a/clients/src/main/java/org/apache/kafka/common/record/DefaultRecord.java
+++ b/clients/src/main/java/org/apache/kafka/common/record/DefaultRecord.java
@@ -18,13 +18,15 @@ package org.apache.kafka.common.record;
 
 import org.apache.kafka.common.utils.ByteBufferOutputStream;
 import org.apache.kafka.common.utils.ByteUtils;
-import org.apache.kafka.common.utils.Crc32;
+import org.apache.kafka.common.utils.Checksums;
+import org.apache.kafka.common.utils.Crc32C;
 import org.apache.kafka.common.utils.Utils;
 
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.IOException;
 import java.nio.ByteBuffer;
+import java.util.zip.Checksum;
 
 import static org.apache.kafka.common.record.RecordBatch.MAGIC_VALUE_V2;
 import static org.apache.kafka.common.utils.Utils.wrapNullable;
@@ -258,14 +260,14 @@ public class DefaultRecord implements Record {
     private static long computeChecksum(long timestamp,
                                         ByteBuffer key,
                                         ByteBuffer value) {
-        Crc32 crc = new Crc32();
-        crc.updateLong(timestamp);
+        Checksum crc = Crc32C.create();
+        Checksums.updateLong(crc, timestamp);
 
         if (key != null)
-            crc.update(key, key.remaining());
+            Checksums.update(crc, key, key.remaining());
 
         if (value != null)
-            crc.update(value, value.remaining());
+            Checksums.update(crc, value, value.remaining());
 
         return crc.getValue();
     }

http://git-wip-us.apache.org/repos/asf/kafka/blob/6feaa8a5/clients/src/main/java/org/apache/kafka/common/record/DefaultRecordBatch.java
----------------------------------------------------------------------
diff --git a/clients/src/main/java/org/apache/kafka/common/record/DefaultRecordBatch.java b/clients/src/main/java/org/apache/kafka/common/record/DefaultRecordBatch.java
index 8f50a2b..665ddd1 100644
--- a/clients/src/main/java/org/apache/kafka/common/record/DefaultRecordBatch.java
+++ b/clients/src/main/java/org/apache/kafka/common/record/DefaultRecordBatch.java
@@ -19,7 +19,7 @@ package org.apache.kafka.common.record;
 import org.apache.kafka.common.KafkaException;
 import org.apache.kafka.common.utils.ByteBufferInputStream;
 import org.apache.kafka.common.utils.ByteUtils;
-import org.apache.kafka.common.utils.Crc32;
+import org.apache.kafka.common.utils.Crc32C;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -49,11 +49,11 @@ import static org.apache.kafka.common.record.Records.LOG_OVERHEAD;
  * Note that when compression is enabled (see attributes below), the compressed record data is serialized
  * directly following the count of the number of records.
  *
- * The CRC covers the data from the attributes to the end of the batch. Note that the location is
- * located after the magic byte, which means that consumers must parse the magic byte before
- * deciding how to interpret the bytes between the batch length and the magic byte. The reason that
- * the partition leader epoch field is moved ahead of the CRC is to avoid the need to recompute the CRC
- * for every batch that is received by the broker when this field is assigned.
+ * The CRC covers the data from the attributes to the end of the batch (i.e. all the bytes that follow the CRC). It is
+ * located after the magic byte, which means that clients must parse the magic byte before deciding how to interpret
+ * the bytes between the batch length and the magic byte. The partition leader epoch field is not included in the CRC
+ * computation to avoid the need to recompute the CRC when this field is assigned for every batch that is received by
+ * the broker. The CRC-32C (Castagnoli) polynomial is used for the computation.
  *
  * The current attributes are given below:
  *
@@ -270,7 +270,7 @@ public class DefaultRecordBatch extends AbstractRecordBatch implements MutableRe
     }
 
     private long computeChecksum() {
-        return Crc32.crc32(buffer, ATTRIBUTES_OFFSET, buffer.limit() - ATTRIBUTES_OFFSET);
+        return Crc32C.compute(buffer, ATTRIBUTES_OFFSET, buffer.limit() - ATTRIBUTES_OFFSET);
     }
 
     private byte attributes() {
@@ -342,7 +342,7 @@ public class DefaultRecordBatch extends AbstractRecordBatch implements MutableRe
         buffer.putShort(position + PRODUCER_EPOCH_OFFSET, epoch);
         buffer.putInt(position + BASE_SEQUENCE_OFFSET, sequence);
         buffer.putInt(position + RECORDS_COUNT_OFFSET, numRecords);
-        long crc = Crc32.crc32(buffer, ATTRIBUTES_OFFSET, sizeInBytes - ATTRIBUTES_OFFSET);
+        long crc = Crc32C.compute(buffer, ATTRIBUTES_OFFSET, sizeInBytes - ATTRIBUTES_OFFSET);
         buffer.putInt(position + CRC_OFFSET, (int) crc);
     }
 

http://git-wip-us.apache.org/repos/asf/kafka/blob/6feaa8a5/clients/src/main/java/org/apache/kafka/common/record/LegacyRecord.java
----------------------------------------------------------------------
diff --git a/clients/src/main/java/org/apache/kafka/common/record/LegacyRecord.java b/clients/src/main/java/org/apache/kafka/common/record/LegacyRecord.java
index 39908ef..69ee4c3 100644
--- a/clients/src/main/java/org/apache/kafka/common/record/LegacyRecord.java
+++ b/clients/src/main/java/org/apache/kafka/common/record/LegacyRecord.java
@@ -19,6 +19,7 @@ package org.apache.kafka.common.record;
 import org.apache.kafka.common.KafkaException;
 import org.apache.kafka.common.utils.ByteBufferOutputStream;
 import org.apache.kafka.common.utils.ByteUtils;
+import org.apache.kafka.common.utils.Checksums;
 import org.apache.kafka.common.utils.Crc32;
 import org.apache.kafka.common.utils.Utils;
 
@@ -526,22 +527,22 @@ public final class LegacyRecord {
         crc.update(magic);
         crc.update(attributes);
         if (magic > RecordBatch.MAGIC_VALUE_V0)
-            crc.updateLong(timestamp);
+            Checksums.updateLong(crc, timestamp);
         // update for the key
         if (key == null) {
-            crc.updateInt(-1);
+            Checksums.updateInt(crc, -1);
         } else {
             int size = key.remaining();
-            crc.updateInt(size);
-            crc.update(key, size);
+            Checksums.updateInt(crc, size);
+            Checksums.update(crc, key, size);
         }
         // update for the value
         if (value == null) {
-            crc.updateInt(-1);
+            Checksums.updateInt(crc, -1);
         } else {
             int size = value.remaining();
-            crc.updateInt(size);
-            crc.update(value, size);
+            Checksums.updateInt(crc, size);
+            Checksums.update(crc, value, size);
         }
         return crc.getValue();
     }

http://git-wip-us.apache.org/repos/asf/kafka/blob/6feaa8a5/clients/src/main/java/org/apache/kafka/common/utils/Checksums.java
----------------------------------------------------------------------
diff --git a/clients/src/main/java/org/apache/kafka/common/utils/Checksums.java b/clients/src/main/java/org/apache/kafka/common/utils/Checksums.java
new file mode 100644
index 0000000..679b592
--- /dev/null
+++ b/clients/src/main/java/org/apache/kafka/common/utils/Checksums.java
@@ -0,0 +1,67 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.kafka.common.utils;
+
+import java.nio.ByteBuffer;
+import java.util.zip.Checksum;
+
+/**
+ * Utility methods for `Checksum` instances.
+ *
+ * Implementation note: we can add methods to our implementations of CRC32 and CRC32C, but we cannot do the same for
+ * the Java implementations (we prefer the Java 9 implementation of CRC32C if available). A utility class is the
+ * simplest way to add methods that are useful for all Checksum implementations.
+ *
+ * NOTE: This class is intended for INTERNAL usage only within Kafka.
+ */
+public final class Checksums {
+
+    private Checksums() {
+    }
+
+    public static void update(Checksum checksum, ByteBuffer buffer, int length) {
+        update(checksum, buffer, 0, length);
+    }
+
+    public static void update(Checksum checksum, ByteBuffer buffer, int offset, int length) {
+        if (buffer.hasArray()) {
+            checksum.update(buffer.array(), buffer.position() + buffer.arrayOffset() + offset, length);
+        } else {
+            int start = buffer.position() + offset;
+            for (int i = start; i < start + length; i++)
+                checksum.update(buffer.get(i));
+        }
+    }
+    
+    public static void updateInt(Checksum checksum, int input) {
+        checksum.update((byte) (input >> 24));
+        checksum.update((byte) (input >> 16));
+        checksum.update((byte) (input >> 8));
+        checksum.update((byte) input /* >> 0 */);
+    }
+
+    public static void updateLong(Checksum checksum, long input) {
+        checksum.update((byte) (input >> 56));
+        checksum.update((byte) (input >> 48));
+        checksum.update((byte) (input >> 40));
+        checksum.update((byte) (input >> 32));
+        checksum.update((byte) (input >> 24));
+        checksum.update((byte) (input >> 16));
+        checksum.update((byte) (input >> 8));
+        checksum.update((byte) input /* >> 0 */);
+    }
+}

http://git-wip-us.apache.org/repos/asf/kafka/blob/6feaa8a5/clients/src/main/java/org/apache/kafka/common/utils/Crc32.java
----------------------------------------------------------------------
diff --git a/clients/src/main/java/org/apache/kafka/common/utils/Crc32.java b/clients/src/main/java/org/apache/kafka/common/utils/Crc32.java
index 687d246..9bfc576 100644
--- a/clients/src/main/java/org/apache/kafka/common/utils/Crc32.java
+++ b/clients/src/main/java/org/apache/kafka/common/utils/Crc32.java
@@ -67,7 +67,7 @@ public class Crc32 implements Checksum {
      */
     public static long crc32(ByteBuffer buffer, int offset, int size) {
         Crc32 crc = new Crc32();
-        crc.update(buffer, offset, size);
+        Checksums.update(crc, buffer, offset, size);
         return crc.getValue();
     }
 
@@ -89,20 +89,6 @@ public class Crc32 implements Checksum {
         crc = 0xffffffff;
     }
 
-    public void update(ByteBuffer buffer, int length) {
-        update(buffer, 0, length);
-    }
-
-    public void update(ByteBuffer buffer, int offset, int length) {
-        if (buffer.hasArray()) {
-            update(buffer.array(), buffer.position() + buffer.arrayOffset() + offset, length);
-        } else {
-            int start = buffer.position() + offset;
-            for (int i = start; i < start + length; i++)
-                update(buffer.get(i));
-        }
-    }
-
     @Override
     public void update(byte[] b, int off, int len) {
         if (off < 0 || len < 0 || off > b.length - len)
@@ -157,27 +143,6 @@ public class Crc32 implements Checksum {
         crc = (crc >>> 8) ^ T[T8_0_START + ((crc ^ b) & 0xff)];
     }
 
-    /**
-     * Update the CRC32 given an integer
-     */
-    final public void updateInt(int input) {
-        update((byte) (input >> 24));
-        update((byte) (input >> 16));
-        update((byte) (input >> 8));
-        update((byte) input /* >> 0 */);
-    }
-
-    final public void updateLong(long input) {
-        update((byte) (input >> 56));
-        update((byte) (input >> 48));
-        update((byte) (input >> 40));
-        update((byte) (input >> 32));
-        update((byte) (input >> 24));
-        update((byte) (input >> 16));
-        update((byte) (input >> 8));
-        update((byte) input /* >> 0 */);
-    }
-
     /*
      * CRC-32 lookup tables generated by the polynomial 0xEDB88320. See also TestPureJavaCrc32.Table.
      */

http://git-wip-us.apache.org/repos/asf/kafka/blob/6feaa8a5/clients/src/main/java/org/apache/kafka/common/utils/Crc32C.java
----------------------------------------------------------------------
diff --git a/clients/src/main/java/org/apache/kafka/common/utils/Crc32C.java b/clients/src/main/java/org/apache/kafka/common/utils/Crc32C.java
new file mode 100644
index 0000000..b547beb
--- /dev/null
+++ b/clients/src/main/java/org/apache/kafka/common/utils/Crc32C.java
@@ -0,0 +1,112 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.kafka.common.utils;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+import java.nio.ByteBuffer;
+import java.util.zip.Checksum;
+
+/**
+ * A class that can be used to compute the CRC32C (Castagnoli) of a ByteBuffer or array of bytes.
+ *
+ * We use java.util.zip.CRC32C (introduced in Java 9) if it is available and fallback to PureJavaCrc32C, otherwise.
+ * java.util.zip.CRC32C is significantly faster on reasonably modern CPUs as it uses the CRC32 instruction introduced
+ * in SSE4.2.
+ *
+ * NOTE: This class is intended for INTERNAL usage only within Kafka.
+ */
+public class Crc32C {
+
+    private static final ChecksumFactory CHECKSUM_FACTORY;
+
+    static {
+        if (Java.IS_JAVA9_COMPATIBLE)
+            CHECKSUM_FACTORY = new Java9ChecksumFactory();
+        else
+            CHECKSUM_FACTORY = new PureJavaChecksumFactory();
+    }
+
+    /**
+     * Compute the CRC32C (Castagnoli) of the segment of the byte array given by the specified size and offset
+     *
+     * @param bytes The bytes to checksum
+     * @param offset the offset at which to begin the checksum computation
+     * @param size the number of bytes to checksum
+     * @return The CRC32C
+     */
+    public static long compute(byte[] bytes, int offset, int size) {
+        Checksum crc = create();
+        crc.update(bytes, offset, size);
+        return crc.getValue();
+    }
+
+    /**
+     * Compute the CRC32C (Castagnoli) of a byte buffer from a given offset (relative to the buffer's current position)
+     *
+     * @param buffer The buffer with the underlying data
+     * @param offset The offset relative to the current position
+     * @param size The number of bytes beginning from the offset to include
+     * @return The CRC32C
+     */
+    public static long compute(ByteBuffer buffer, int offset, int size) {
+        Checksum crc = create();
+        Checksums.update(crc, buffer, offset, size);
+        return crc.getValue();
+    }
+
+    public static Checksum create() {
+        return CHECKSUM_FACTORY.create();
+    }
+
+    private interface ChecksumFactory {
+        Checksum create();
+    }
+
+    private static class Java9ChecksumFactory implements ChecksumFactory {
+        private static final MethodHandle CONSTRUCTOR;
+
+        static {
+            try {
+                Class<?> cls = Class.forName("java.util.zip.CRC32C");
+                CONSTRUCTOR = MethodHandles.publicLookup().findConstructor(cls, MethodType.methodType(void.class));
+            } catch (ReflectiveOperationException e) {
+                // Should never happen
+                throw new RuntimeException(e);
+            }
+        }
+
+        @Override
+        public Checksum create() {
+            try {
+                return (Checksum) CONSTRUCTOR.invoke();
+            } catch (Throwable throwable) {
+                // Should never happen
+                throw new RuntimeException(throwable);
+            }
+        }
+    }
+
+    private static class PureJavaChecksumFactory implements ChecksumFactory {
+        @Override
+        public Checksum create() {
+            return new PureJavaCrc32C();
+        }
+    }
+}

http://git-wip-us.apache.org/repos/asf/kafka/blob/6feaa8a5/clients/src/main/java/org/apache/kafka/common/utils/Java.java
----------------------------------------------------------------------
diff --git a/clients/src/main/java/org/apache/kafka/common/utils/Java.java b/clients/src/main/java/org/apache/kafka/common/utils/Java.java
new file mode 100644
index 0000000..34eb6bf
--- /dev/null
+++ b/clients/src/main/java/org/apache/kafka/common/utils/Java.java
@@ -0,0 +1,44 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.kafka.common.utils;
+
+import java.util.StringTokenizer;
+
+public final class Java {
+
+    private Java() {
+    }
+
+    public static final String JVM_SPEC_VERSION = System.getProperty("java.specification.version");
+
+    private static final int JVM_MAJOR_VERSION;
+    private static final int JVM_MINOR_VERSION;
+
+    static {
+        final StringTokenizer st = new StringTokenizer(JVM_SPEC_VERSION, ".");
+        JVM_MAJOR_VERSION = Integer.parseInt(st.nextToken());
+        if (st.hasMoreTokens()) {
+            JVM_MINOR_VERSION = Integer.parseInt(st.nextToken());
+        } else {
+            JVM_MINOR_VERSION = 0;
+        }
+    }
+
+    public static final boolean IS_JAVA9_COMPATIBLE = JVM_MAJOR_VERSION > 1 ||
+            (JVM_MAJOR_VERSION == 1 && JVM_MINOR_VERSION >= 9);
+
+}

http://git-wip-us.apache.org/repos/asf/kafka/blob/6feaa8a5/clients/src/main/java/org/apache/kafka/common/utils/PureJavaCrc32C.java
----------------------------------------------------------------------
diff --git a/clients/src/main/java/org/apache/kafka/common/utils/PureJavaCrc32C.java b/clients/src/main/java/org/apache/kafka/common/utils/PureJavaCrc32C.java
new file mode 100644
index 0000000..3489ddd
--- /dev/null
+++ b/clients/src/main/java/org/apache/kafka/common/utils/PureJavaCrc32C.java
@@ -0,0 +1,644 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+/*
+ * Some portions of this file Copyright (c) 2004-2006 Intel Corporation and
+ * licensed under the BSD license.
+ */
+package org.apache.kafka.common.utils;
+
+import java.util.zip.Checksum;
+
+/**
+ * This class was taken from Hadoop: org.apache.hadoop.util.PureJavaCrc32C.
+ *
+ * A pure-java implementation of the CRC32 checksum that uses
+ * the CRC32-C polynomial, the same polynomial used by iSCSI
+ * and implemented on many Intel chipsets supporting SSE4.2.
+ *
+ * NOTE: This class is intended for INTERNAL usage only within Kafka.
+ */
+// The exact version that was retrieved from Hadoop:
+// https://github.com/apache/hadoop/blob/224de4f92c222a7b915e9c5d6bdd1a4a3fcbcf31/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/PureJavaCrc32C.java
+public class PureJavaCrc32C implements Checksum {
+
+    /** the current CRC value, bit-flipped */
+    private int crc;
+
+    public PureJavaCrc32C() {
+        reset();
+    }
+
+    @Override
+    public long getValue() {
+        long ret = crc;
+        return (~ret) & 0xffffffffL;
+    }
+
+    @Override
+    public void reset() {
+        crc = 0xffffffff;
+    }
+
+    @Override
+    public void update(byte[] b, int off, int len) {
+        int localCrc = crc;
+
+        while (len > 7) {
+            final int c0 = (b[off + 0] ^ localCrc) & 0xff;
+            final int c1 = (b[off + 1] ^ (localCrc >>>= 8)) & 0xff;
+            final int c2 = (b[off + 2] ^ (localCrc >>>= 8)) & 0xff;
+            final int c3 = (b[off + 3] ^ (localCrc >>>= 8)) & 0xff;
+            localCrc = (T[T8_7_START + c0] ^ T[T8_6_START + c1])
+                    ^ (T[T8_5_START + c2] ^ T[T8_4_START + c3]);
+
+            final int c4 = b[off + 4] & 0xff;
+            final int c5 = b[off + 5] & 0xff;
+            final int c6 = b[off + 6] & 0xff;
+            final int c7 = b[off + 7] & 0xff;
+
+            localCrc ^= (T[T8_3_START + c4] ^ T[T8_2_START + c5])
+                    ^ (T[T8_1_START + c6] ^ T[T8_0_START + c7]);
+
+            off += 8;
+            len -= 8;
+        }
+
+    /* loop unroll - duff's device style */
+        switch (len) {
+            case 7:
+                localCrc = (localCrc >>> 8) ^ T[T8_0_START + ((localCrc ^ b[off++]) & 0xff)];
+            case 6:
+                localCrc = (localCrc >>> 8) ^ T[T8_0_START + ((localCrc ^ b[off++]) & 0xff)];
+            case 5:
+                localCrc = (localCrc >>> 8) ^ T[T8_0_START + ((localCrc ^ b[off++]) & 0xff)];
+            case 4:
+                localCrc = (localCrc >>> 8) ^ T[T8_0_START + ((localCrc ^ b[off++]) & 0xff)];
+            case 3:
+                localCrc = (localCrc >>> 8) ^ T[T8_0_START + ((localCrc ^ b[off++]) & 0xff)];
+            case 2:
+                localCrc = (localCrc >>> 8) ^ T[T8_0_START + ((localCrc ^ b[off++]) & 0xff)];
+            case 1:
+                localCrc = (localCrc >>> 8) ^ T[T8_0_START + ((localCrc ^ b[off++]) & 0xff)];
+            default:
+        /* nothing */
+        }
+
+        // Publish crc out to object
+        crc = localCrc;
+    }
+
+    @Override
+    final public void update(int b) {
+        crc = (crc >>> 8) ^ T[T8_0_START + ((crc ^ b) & 0xff)];
+    }
+
+    // CRC polynomial tables generated by:
+    // java -cp build/test/classes/:build/classes/ \
+    //   org.apache.hadoop.util.TestPureJavaCrc32\$Table 82F63B78
+
+    private static final int T8_0_START = 0 * 256;
+    private static final int T8_1_START = 1 * 256;
+    private static final int T8_2_START = 2 * 256;
+    private static final int T8_3_START = 3 * 256;
+    private static final int T8_4_START = 4 * 256;
+    private static final int T8_5_START = 5 * 256;
+    private static final int T8_6_START = 6 * 256;
+    private static final int T8_7_START = 7 * 256;
+
+    private static final int[] T = new int[]{
+        /* T8_0 */
+        0x00000000, 0xF26B8303, 0xE13B70F7, 0x1350F3F4,
+        0xC79A971F, 0x35F1141C, 0x26A1E7E8, 0xD4CA64EB,
+        0x8AD958CF, 0x78B2DBCC, 0x6BE22838, 0x9989AB3B,
+        0x4D43CFD0, 0xBF284CD3, 0xAC78BF27, 0x5E133C24,
+        0x105EC76F, 0xE235446C, 0xF165B798, 0x030E349B,
+        0xD7C45070, 0x25AFD373, 0x36FF2087, 0xC494A384,
+        0x9A879FA0, 0x68EC1CA3, 0x7BBCEF57, 0x89D76C54,
+        0x5D1D08BF, 0xAF768BBC, 0xBC267848, 0x4E4DFB4B,
+        0x20BD8EDE, 0xD2D60DDD, 0xC186FE29, 0x33ED7D2A,
+        0xE72719C1, 0x154C9AC2, 0x061C6936, 0xF477EA35,
+        0xAA64D611, 0x580F5512, 0x4B5FA6E6, 0xB93425E5,
+        0x6DFE410E, 0x9F95C20D, 0x8CC531F9, 0x7EAEB2FA,
+        0x30E349B1, 0xC288CAB2, 0xD1D83946, 0x23B3BA45,
+        0xF779DEAE, 0x05125DAD, 0x1642AE59, 0xE4292D5A,
+        0xBA3A117E, 0x4851927D, 0x5B016189, 0xA96AE28A,
+        0x7DA08661, 0x8FCB0562, 0x9C9BF696, 0x6EF07595,
+        0x417B1DBC, 0xB3109EBF, 0xA0406D4B, 0x522BEE48,
+        0x86E18AA3, 0x748A09A0, 0x67DAFA54, 0x95B17957,
+        0xCBA24573, 0x39C9C670, 0x2A993584, 0xD8F2B687,
+        0x0C38D26C, 0xFE53516F, 0xED03A29B, 0x1F682198,
+        0x5125DAD3, 0xA34E59D0, 0xB01EAA24, 0x42752927,
+        0x96BF4DCC, 0x64D4CECF, 0x77843D3B, 0x85EFBE38,
+        0xDBFC821C, 0x2997011F, 0x3AC7F2EB, 0xC8AC71E8,
+        0x1C661503, 0xEE0D9600, 0xFD5D65F4, 0x0F36E6F7,
+        0x61C69362, 0x93AD1061, 0x80FDE395, 0x72966096,
+        0xA65C047D, 0x5437877E, 0x4767748A, 0xB50CF789,
+        0xEB1FCBAD, 0x197448AE, 0x0A24BB5A, 0xF84F3859,
+        0x2C855CB2, 0xDEEEDFB1, 0xCDBE2C45, 0x3FD5AF46,
+        0x7198540D, 0x83F3D70E, 0x90A324FA, 0x62C8A7F9,
+        0xB602C312, 0x44694011, 0x5739B3E5, 0xA55230E6,
+        0xFB410CC2, 0x092A8FC1, 0x1A7A7C35, 0xE811FF36,
+        0x3CDB9BDD, 0xCEB018DE, 0xDDE0EB2A, 0x2F8B6829,
+        0x82F63B78, 0x709DB87B, 0x63CD4B8F, 0x91A6C88C,
+        0x456CAC67, 0xB7072F64, 0xA457DC90, 0x563C5F93,
+        0x082F63B7, 0xFA44E0B4, 0xE9141340, 0x1B7F9043,
+        0xCFB5F4A8, 0x3DDE77AB, 0x2E8E845F, 0xDCE5075C,
+        0x92A8FC17, 0x60C37F14, 0x73938CE0, 0x81F80FE3,
+        0x55326B08, 0xA759E80B, 0xB4091BFF, 0x466298FC,
+        0x1871A4D8, 0xEA1A27DB, 0xF94AD42F, 0x0B21572C,
+        0xDFEB33C7, 0x2D80B0C4, 0x3ED04330, 0xCCBBC033,
+        0xA24BB5A6, 0x502036A5, 0x4370C551, 0xB11B4652,
+        0x65D122B9, 0x97BAA1BA, 0x84EA524E, 0x7681D14D,
+        0x2892ED69, 0xDAF96E6A, 0xC9A99D9E, 0x3BC21E9D,
+        0xEF087A76, 0x1D63F975, 0x0E330A81, 0xFC588982,
+        0xB21572C9, 0x407EF1CA, 0x532E023E, 0xA145813D,
+        0x758FE5D6, 0x87E466D5, 0x94B49521, 0x66DF1622,
+        0x38CC2A06, 0xCAA7A905, 0xD9F75AF1, 0x2B9CD9F2,
+        0xFF56BD19, 0x0D3D3E1A, 0x1E6DCDEE, 0xEC064EED,
+        0xC38D26C4, 0x31E6A5C7, 0x22B65633, 0xD0DDD530,
+        0x0417B1DB, 0xF67C32D8, 0xE52CC12C, 0x1747422F,
+        0x49547E0B, 0xBB3FFD08, 0xA86F0EFC, 0x5A048DFF,
+        0x8ECEE914, 0x7CA56A17, 0x6FF599E3, 0x9D9E1AE0,
+        0xD3D3E1AB, 0x21B862A8, 0x32E8915C, 0xC083125F,
+        0x144976B4, 0xE622F5B7, 0xF5720643, 0x07198540,
+        0x590AB964, 0xAB613A67, 0xB831C993, 0x4A5A4A90,
+        0x9E902E7B, 0x6CFBAD78, 0x7FAB5E8C, 0x8DC0DD8F,
+        0xE330A81A, 0x115B2B19, 0x020BD8ED, 0xF0605BEE,
+        0x24AA3F05, 0xD6C1BC06, 0xC5914FF2, 0x37FACCF1,
+        0x69E9F0D5, 0x9B8273D6, 0x88D28022, 0x7AB90321,
+        0xAE7367CA, 0x5C18E4C9, 0x4F48173D, 0xBD23943E,
+        0xF36E6F75, 0x0105EC76, 0x12551F82, 0xE03E9C81,
+        0x34F4F86A, 0xC69F7B69, 0xD5CF889D, 0x27A40B9E,
+        0x79B737BA, 0x8BDCB4B9, 0x988C474D, 0x6AE7C44E,
+        0xBE2DA0A5, 0x4C4623A6, 0x5F16D052, 0xAD7D5351,
+        /* T8_1 */
+        0x00000000, 0x13A29877, 0x274530EE, 0x34E7A899,
+        0x4E8A61DC, 0x5D28F9AB, 0x69CF5132, 0x7A6DC945,
+        0x9D14C3B8, 0x8EB65BCF, 0xBA51F356, 0xA9F36B21,
+        0xD39EA264, 0xC03C3A13, 0xF4DB928A, 0xE7790AFD,
+        0x3FC5F181, 0x2C6769F6, 0x1880C16F, 0x0B225918,
+        0x714F905D, 0x62ED082A, 0x560AA0B3, 0x45A838C4,
+        0xA2D13239, 0xB173AA4E, 0x859402D7, 0x96369AA0,
+        0xEC5B53E5, 0xFFF9CB92, 0xCB1E630B, 0xD8BCFB7C,
+        0x7F8BE302, 0x6C297B75, 0x58CED3EC, 0x4B6C4B9B,
+        0x310182DE, 0x22A31AA9, 0x1644B230, 0x05E62A47,
+        0xE29F20BA, 0xF13DB8CD, 0xC5DA1054, 0xD6788823,
+        0xAC154166, 0xBFB7D911, 0x8B507188, 0x98F2E9FF,
+        0x404E1283, 0x53EC8AF4, 0x670B226D, 0x74A9BA1A,
+        0x0EC4735F, 0x1D66EB28, 0x298143B1, 0x3A23DBC6,
+        0xDD5AD13B, 0xCEF8494C, 0xFA1FE1D5, 0xE9BD79A2,
+        0x93D0B0E7, 0x80722890, 0xB4958009, 0xA737187E,
+        0xFF17C604, 0xECB55E73, 0xD852F6EA, 0xCBF06E9D,
+        0xB19DA7D8, 0xA23F3FAF, 0x96D89736, 0x857A0F41,
+        0x620305BC, 0x71A19DCB, 0x45463552, 0x56E4AD25,
+        0x2C896460, 0x3F2BFC17, 0x0BCC548E, 0x186ECCF9,
+        0xC0D23785, 0xD370AFF2, 0xE797076B, 0xF4359F1C,
+        0x8E585659, 0x9DFACE2E, 0xA91D66B7, 0xBABFFEC0,
+        0x5DC6F43D, 0x4E646C4A, 0x7A83C4D3, 0x69215CA4,
+        0x134C95E1, 0x00EE0D96, 0x3409A50F, 0x27AB3D78,
+        0x809C2506, 0x933EBD71, 0xA7D915E8, 0xB47B8D9F,
+        0xCE1644DA, 0xDDB4DCAD, 0xE9537434, 0xFAF1EC43,
+        0x1D88E6BE, 0x0E2A7EC9, 0x3ACDD650, 0x296F4E27,
+        0x53028762, 0x40A01F15, 0x7447B78C, 0x67E52FFB,
+        0xBF59D487, 0xACFB4CF0, 0x981CE469, 0x8BBE7C1E,
+        0xF1D3B55B, 0xE2712D2C, 0xD69685B5, 0xC5341DC2,
+        0x224D173F, 0x31EF8F48, 0x050827D1, 0x16AABFA6,
+        0x6CC776E3, 0x7F65EE94, 0x4B82460D, 0x5820DE7A,
+        0xFBC3FAF9, 0xE861628E, 0xDC86CA17, 0xCF245260,
+        0xB5499B25, 0xA6EB0352, 0x920CABCB, 0x81AE33BC,
+        0x66D73941, 0x7575A136, 0x419209AF, 0x523091D8,
+        0x285D589D, 0x3BFFC0EA, 0x0F186873, 0x1CBAF004,
+        0xC4060B78, 0xD7A4930F, 0xE3433B96, 0xF0E1A3E1,
+        0x8A8C6AA4, 0x992EF2D3, 0xADC95A4A, 0xBE6BC23D,
+        0x5912C8C0, 0x4AB050B7, 0x7E57F82E, 0x6DF56059,
+        0x1798A91C, 0x043A316B, 0x30DD99F2, 0x237F0185,
+        0x844819FB, 0x97EA818C, 0xA30D2915, 0xB0AFB162,
+        0xCAC27827, 0xD960E050, 0xED8748C9, 0xFE25D0BE,
+        0x195CDA43, 0x0AFE4234, 0x3E19EAAD, 0x2DBB72DA,
+        0x57D6BB9F, 0x447423E8, 0x70938B71, 0x63311306,
+        0xBB8DE87A, 0xA82F700D, 0x9CC8D894, 0x8F6A40E3,
+        0xF50789A6, 0xE6A511D1, 0xD242B948, 0xC1E0213F,
+        0x26992BC2, 0x353BB3B5, 0x01DC1B2C, 0x127E835B,
+        0x68134A1E, 0x7BB1D269, 0x4F567AF0, 0x5CF4E287,
+        0x04D43CFD, 0x1776A48A, 0x23910C13, 0x30339464,
+        0x4A5E5D21, 0x59FCC556, 0x6D1B6DCF, 0x7EB9F5B8,
+        0x99C0FF45, 0x8A626732, 0xBE85CFAB, 0xAD2757DC,
+        0xD74A9E99, 0xC4E806EE, 0xF00FAE77, 0xE3AD3600,
+        0x3B11CD7C, 0x28B3550B, 0x1C54FD92, 0x0FF665E5,
+        0x759BACA0, 0x663934D7, 0x52DE9C4E, 0x417C0439,
+        0xA6050EC4, 0xB5A796B3, 0x81403E2A, 0x92E2A65D,
+        0xE88F6F18, 0xFB2DF76F, 0xCFCA5FF6, 0xDC68C781,
+        0x7B5FDFFF, 0x68FD4788, 0x5C1AEF11, 0x4FB87766,
+        0x35D5BE23, 0x26772654, 0x12908ECD, 0x013216BA,
+        0xE64B1C47, 0xF5E98430, 0xC10E2CA9, 0xD2ACB4DE,
+        0xA8C17D9B, 0xBB63E5EC, 0x8F844D75, 0x9C26D502,
+        0x449A2E7E, 0x5738B609, 0x63DF1E90, 0x707D86E7,
+        0x0A104FA2, 0x19B2D7D5, 0x2D557F4C, 0x3EF7E73B,
+        0xD98EEDC6, 0xCA2C75B1, 0xFECBDD28, 0xED69455F,
+        0x97048C1A, 0x84A6146D, 0xB041BCF4, 0xA3E32483,
+        /* T8_2 */
+        0x00000000, 0xA541927E, 0x4F6F520D, 0xEA2EC073,
+        0x9EDEA41A, 0x3B9F3664, 0xD1B1F617, 0x74F06469,
+        0x38513EC5, 0x9D10ACBB, 0x773E6CC8, 0xD27FFEB6,
+        0xA68F9ADF, 0x03CE08A1, 0xE9E0C8D2, 0x4CA15AAC,
+        0x70A27D8A, 0xD5E3EFF4, 0x3FCD2F87, 0x9A8CBDF9,
+        0xEE7CD990, 0x4B3D4BEE, 0xA1138B9D, 0x045219E3,
+        0x48F3434F, 0xEDB2D131, 0x079C1142, 0xA2DD833C,
+        0xD62DE755, 0x736C752B, 0x9942B558, 0x3C032726,
+        0xE144FB14, 0x4405696A, 0xAE2BA919, 0x0B6A3B67,
+        0x7F9A5F0E, 0xDADBCD70, 0x30F50D03, 0x95B49F7D,
+        0xD915C5D1, 0x7C5457AF, 0x967A97DC, 0x333B05A2,
+        0x47CB61CB, 0xE28AF3B5, 0x08A433C6, 0xADE5A1B8,
+        0x91E6869E, 0x34A714E0, 0xDE89D493, 0x7BC846ED,
+        0x0F382284, 0xAA79B0FA, 0x40577089, 0xE516E2F7,
+        0xA9B7B85B, 0x0CF62A25, 0xE6D8EA56, 0x43997828,
+        0x37691C41, 0x92288E3F, 0x78064E4C, 0xDD47DC32,
+        0xC76580D9, 0x622412A7, 0x880AD2D4, 0x2D4B40AA,
+        0x59BB24C3, 0xFCFAB6BD, 0x16D476CE, 0xB395E4B0,
+        0xFF34BE1C, 0x5A752C62, 0xB05BEC11, 0x151A7E6F,
+        0x61EA1A06, 0xC4AB8878, 0x2E85480B, 0x8BC4DA75,
+        0xB7C7FD53, 0x12866F2D, 0xF8A8AF5E, 0x5DE93D20,
+        0x29195949, 0x8C58CB37, 0x66760B44, 0xC337993A,
+        0x8F96C396, 0x2AD751E8, 0xC0F9919B, 0x65B803E5,
+        0x1148678C, 0xB409F5F2, 0x5E273581, 0xFB66A7FF,
+        0x26217BCD, 0x8360E9B3, 0x694E29C0, 0xCC0FBBBE,
+        0xB8FFDFD7, 0x1DBE4DA9, 0xF7908DDA, 0x52D11FA4,
+        0x1E704508, 0xBB31D776, 0x511F1705, 0xF45E857B,
+        0x80AEE112, 0x25EF736C, 0xCFC1B31F, 0x6A802161,
+        0x56830647, 0xF3C29439, 0x19EC544A, 0xBCADC634,
+        0xC85DA25D, 0x6D1C3023, 0x8732F050, 0x2273622E,
+        0x6ED23882, 0xCB93AAFC, 0x21BD6A8F, 0x84FCF8F1,
+        0xF00C9C98, 0x554D0EE6, 0xBF63CE95, 0x1A225CEB,
+        0x8B277743, 0x2E66E53D, 0xC448254E, 0x6109B730,
+        0x15F9D359, 0xB0B84127, 0x5A968154, 0xFFD7132A,
+        0xB3764986, 0x1637DBF8, 0xFC191B8B, 0x595889F5,
+        0x2DA8ED9C, 0x88E97FE2, 0x62C7BF91, 0xC7862DEF,
+        0xFB850AC9, 0x5EC498B7, 0xB4EA58C4, 0x11ABCABA,
+        0x655BAED3, 0xC01A3CAD, 0x2A34FCDE, 0x8F756EA0,
+        0xC3D4340C, 0x6695A672, 0x8CBB6601, 0x29FAF47F,
+        0x5D0A9016, 0xF84B0268, 0x1265C21B, 0xB7245065,
+        0x6A638C57, 0xCF221E29, 0x250CDE5A, 0x804D4C24,
+        0xF4BD284D, 0x51FCBA33, 0xBBD27A40, 0x1E93E83E,
+        0x5232B292, 0xF77320EC, 0x1D5DE09F, 0xB81C72E1,
+        0xCCEC1688, 0x69AD84F6, 0x83834485, 0x26C2D6FB,
+        0x1AC1F1DD, 0xBF8063A3, 0x55AEA3D0, 0xF0EF31AE,
+        0x841F55C7, 0x215EC7B9, 0xCB7007CA, 0x6E3195B4,
+        0x2290CF18, 0x87D15D66, 0x6DFF9D15, 0xC8BE0F6B,
+        0xBC4E6B02, 0x190FF97C, 0xF321390F, 0x5660AB71,
+        0x4C42F79A, 0xE90365E4, 0x032DA597, 0xA66C37E9,
+        0xD29C5380, 0x77DDC1FE, 0x9DF3018D, 0x38B293F3,
+        0x7413C95F, 0xD1525B21, 0x3B7C9B52, 0x9E3D092C,
+        0xEACD6D45, 0x4F8CFF3B, 0xA5A23F48, 0x00E3AD36,
+        0x3CE08A10, 0x99A1186E, 0x738FD81D, 0xD6CE4A63,
+        0xA23E2E0A, 0x077FBC74, 0xED517C07, 0x4810EE79,
+        0x04B1B4D5, 0xA1F026AB, 0x4BDEE6D8, 0xEE9F74A6,
+        0x9A6F10CF, 0x3F2E82B1, 0xD50042C2, 0x7041D0BC,
+        0xAD060C8E, 0x08479EF0, 0xE2695E83, 0x4728CCFD,
+        0x33D8A894, 0x96993AEA, 0x7CB7FA99, 0xD9F668E7,
+        0x9557324B, 0x3016A035, 0xDA386046, 0x7F79F238,
+        0x0B899651, 0xAEC8042F, 0x44E6C45C, 0xE1A75622,
+        0xDDA47104, 0x78E5E37A, 0x92CB2309, 0x378AB177,
+        0x437AD51E, 0xE63B4760, 0x0C158713, 0xA954156D,
+        0xE5F54FC1, 0x40B4DDBF, 0xAA9A1DCC, 0x0FDB8FB2,
+        0x7B2BEBDB, 0xDE6A79A5, 0x3444B9D6, 0x91052BA8,
+        /* T8_3 */
+        0x00000000, 0xDD45AAB8, 0xBF672381, 0x62228939,
+        0x7B2231F3, 0xA6679B4B, 0xC4451272, 0x1900B8CA,
+        0xF64463E6, 0x2B01C95E, 0x49234067, 0x9466EADF,
+        0x8D665215, 0x5023F8AD, 0x32017194, 0xEF44DB2C,
+        0xE964B13D, 0x34211B85, 0x560392BC, 0x8B463804,
+        0x924680CE, 0x4F032A76, 0x2D21A34F, 0xF06409F7,
+        0x1F20D2DB, 0xC2657863, 0xA047F15A, 0x7D025BE2,
+        0x6402E328, 0xB9474990, 0xDB65C0A9, 0x06206A11,
+        0xD725148B, 0x0A60BE33, 0x6842370A, 0xB5079DB2,
+        0xAC072578, 0x71428FC0, 0x136006F9, 0xCE25AC41,
+        0x2161776D, 0xFC24DDD5, 0x9E0654EC, 0x4343FE54,
+        0x5A43469E, 0x8706EC26, 0xE524651F, 0x3861CFA7,
+        0x3E41A5B6, 0xE3040F0E, 0x81268637, 0x5C632C8F,
+        0x45639445, 0x98263EFD, 0xFA04B7C4, 0x27411D7C,
+        0xC805C650, 0x15406CE8, 0x7762E5D1, 0xAA274F69,
+        0xB327F7A3, 0x6E625D1B, 0x0C40D422, 0xD1057E9A,
+        0xABA65FE7, 0x76E3F55F, 0x14C17C66, 0xC984D6DE,
+        0xD0846E14, 0x0DC1C4AC, 0x6FE34D95, 0xB2A6E72D,
+        0x5DE23C01, 0x80A796B9, 0xE2851F80, 0x3FC0B538,
+        0x26C00DF2, 0xFB85A74A, 0x99A72E73, 0x44E284CB,
+        0x42C2EEDA, 0x9F874462, 0xFDA5CD5B, 0x20E067E3,
+        0x39E0DF29, 0xE4A57591, 0x8687FCA8, 0x5BC25610,
+        0xB4868D3C, 0x69C32784, 0x0BE1AEBD, 0xD6A40405,
+        0xCFA4BCCF, 0x12E11677, 0x70C39F4E, 0xAD8635F6,
+        0x7C834B6C, 0xA1C6E1D4, 0xC3E468ED, 0x1EA1C255,
+        0x07A17A9F, 0xDAE4D027, 0xB8C6591E, 0x6583F3A6,
+        0x8AC7288A, 0x57828232, 0x35A00B0B, 0xE8E5A1B3,
+        0xF1E51979, 0x2CA0B3C1, 0x4E823AF8, 0x93C79040,
+        0x95E7FA51, 0x48A250E9, 0x2A80D9D0, 0xF7C57368,
+        0xEEC5CBA2, 0x3380611A, 0x51A2E823, 0x8CE7429B,
+        0x63A399B7, 0xBEE6330F, 0xDCC4BA36, 0x0181108E,
+        0x1881A844, 0xC5C402FC, 0xA7E68BC5, 0x7AA3217D,
+        0x52A0C93F, 0x8FE56387, 0xEDC7EABE, 0x30824006,
+        0x2982F8CC, 0xF4C75274, 0x96E5DB4D, 0x4BA071F5,
+        0xA4E4AAD9, 0x79A10061, 0x1B838958, 0xC6C623E0,
+        0xDFC69B2A, 0x02833192, 0x60A1B8AB, 0xBDE41213,
+        0xBBC47802, 0x6681D2BA, 0x04A35B83, 0xD9E6F13B,
+        0xC0E649F1, 0x1DA3E349, 0x7F816A70, 0xA2C4C0C8,
+        0x4D801BE4, 0x90C5B15C, 0xF2E73865, 0x2FA292DD,
+        0x36A22A17, 0xEBE780AF, 0x89C50996, 0x5480A32E,
+        0x8585DDB4, 0x58C0770C, 0x3AE2FE35, 0xE7A7548D,
+        0xFEA7EC47, 0x23E246FF, 0x41C0CFC6, 0x9C85657E,
+        0x73C1BE52, 0xAE8414EA, 0xCCA69DD3, 0x11E3376B,
+        0x08E38FA1, 0xD5A62519, 0xB784AC20, 0x6AC10698,
+        0x6CE16C89, 0xB1A4C631, 0xD3864F08, 0x0EC3E5B0,
+        0x17C35D7A, 0xCA86F7C2, 0xA8A47EFB, 0x75E1D443,
+        0x9AA50F6F, 0x47E0A5D7, 0x25C22CEE, 0xF8878656,
+        0xE1873E9C, 0x3CC29424, 0x5EE01D1D, 0x83A5B7A5,
+        0xF90696D8, 0x24433C60, 0x4661B559, 0x9B241FE1,
+        0x8224A72B, 0x5F610D93, 0x3D4384AA, 0xE0062E12,
+        0x0F42F53E, 0xD2075F86, 0xB025D6BF, 0x6D607C07,
+        0x7460C4CD, 0xA9256E75, 0xCB07E74C, 0x16424DF4,
+        0x106227E5, 0xCD278D5D, 0xAF050464, 0x7240AEDC,
+        0x6B401616, 0xB605BCAE, 0xD4273597, 0x09629F2F,
+        0xE6264403, 0x3B63EEBB, 0x59416782, 0x8404CD3A,
+        0x9D0475F0, 0x4041DF48, 0x22635671, 0xFF26FCC9,
+        0x2E238253, 0xF36628EB, 0x9144A1D2, 0x4C010B6A,
+        0x5501B3A0, 0x88441918, 0xEA669021, 0x37233A99,
+        0xD867E1B5, 0x05224B0D, 0x6700C234, 0xBA45688C,
+        0xA345D046, 0x7E007AFE, 0x1C22F3C7, 0xC167597F,
+        0xC747336E, 0x1A0299D6, 0x782010EF, 0xA565BA57,
+        0xBC65029D, 0x6120A825, 0x0302211C, 0xDE478BA4,
+        0x31035088, 0xEC46FA30, 0x8E647309, 0x5321D9B1,
+        0x4A21617B, 0x9764CBC3, 0xF54642FA, 0x2803E842,
+        /* T8_4 */
+        0x00000000, 0x38116FAC, 0x7022DF58, 0x4833B0F4,
+        0xE045BEB0, 0xD854D11C, 0x906761E8, 0xA8760E44,
+        0xC5670B91, 0xFD76643D, 0xB545D4C9, 0x8D54BB65,
+        0x2522B521, 0x1D33DA8D, 0x55006A79, 0x6D1105D5,
+        0x8F2261D3, 0xB7330E7F, 0xFF00BE8B, 0xC711D127,
+        0x6F67DF63, 0x5776B0CF, 0x1F45003B, 0x27546F97,
+        0x4A456A42, 0x725405EE, 0x3A67B51A, 0x0276DAB6,
+        0xAA00D4F2, 0x9211BB5E, 0xDA220BAA, 0xE2336406,
+        0x1BA8B557, 0x23B9DAFB, 0x6B8A6A0F, 0x539B05A3,
+        0xFBED0BE7, 0xC3FC644B, 0x8BCFD4BF, 0xB3DEBB13,
+        0xDECFBEC6, 0xE6DED16A, 0xAEED619E, 0x96FC0E32,
+        0x3E8A0076, 0x069B6FDA, 0x4EA8DF2E, 0x76B9B082,
+        0x948AD484, 0xAC9BBB28, 0xE4A80BDC, 0xDCB96470,
+        0x74CF6A34, 0x4CDE0598, 0x04EDB56C, 0x3CFCDAC0,
+        0x51EDDF15, 0x69FCB0B9, 0x21CF004D, 0x19DE6FE1,
+        0xB1A861A5, 0x89B90E09, 0xC18ABEFD, 0xF99BD151,
+        0x37516AAE, 0x0F400502, 0x4773B5F6, 0x7F62DA5A,
+        0xD714D41E, 0xEF05BBB2, 0xA7360B46, 0x9F2764EA,
+        0xF236613F, 0xCA270E93, 0x8214BE67, 0xBA05D1CB,
+        0x1273DF8F, 0x2A62B023, 0x625100D7, 0x5A406F7B,
+        0xB8730B7D, 0x806264D1, 0xC851D425, 0xF040BB89,
+        0x5836B5CD, 0x6027DA61, 0x28146A95, 0x10050539,
+        0x7D1400EC, 0x45056F40, 0x0D36DFB4, 0x3527B018,
+        0x9D51BE5C, 0xA540D1F0, 0xED736104, 0xD5620EA8,
+        0x2CF9DFF9, 0x14E8B055, 0x5CDB00A1, 0x64CA6F0D,
+        0xCCBC6149, 0xF4AD0EE5, 0xBC9EBE11, 0x848FD1BD,
+        0xE99ED468, 0xD18FBBC4, 0x99BC0B30, 0xA1AD649C,
+        0x09DB6AD8, 0x31CA0574, 0x79F9B580, 0x41E8DA2C,
+        0xA3DBBE2A, 0x9BCAD186, 0xD3F96172, 0xEBE80EDE,
+        0x439E009A, 0x7B8F6F36, 0x33BCDFC2, 0x0BADB06E,
+        0x66BCB5BB, 0x5EADDA17, 0x169E6AE3, 0x2E8F054F,
+        0x86F90B0B, 0xBEE864A7, 0xF6DBD453, 0xCECABBFF,
+        0x6EA2D55C, 0x56B3BAF0, 0x1E800A04, 0x269165A8,
+        0x8EE76BEC, 0xB6F60440, 0xFEC5B4B4, 0xC6D4DB18,
+        0xABC5DECD, 0x93D4B161, 0xDBE70195, 0xE3F66E39,
+        0x4B80607D, 0x73910FD1, 0x3BA2BF25, 0x03B3D089,
+        0xE180B48F, 0xD991DB23, 0x91A26BD7, 0xA9B3047B,
+        0x01C50A3F, 0x39D46593, 0x71E7D567, 0x49F6BACB,
+        0x24E7BF1E, 0x1CF6D0B2, 0x54C56046, 0x6CD40FEA,
+        0xC4A201AE, 0xFCB36E02, 0xB480DEF6, 0x8C91B15A,
+        0x750A600B, 0x4D1B0FA7, 0x0528BF53, 0x3D39D0FF,
+        0x954FDEBB, 0xAD5EB117, 0xE56D01E3, 0xDD7C6E4F,
+        0xB06D6B9A, 0x887C0436, 0xC04FB4C2, 0xF85EDB6E,
+        0x5028D52A, 0x6839BA86, 0x200A0A72, 0x181B65DE,
+        0xFA2801D8, 0xC2396E74, 0x8A0ADE80, 0xB21BB12C,
+        0x1A6DBF68, 0x227CD0C4, 0x6A4F6030, 0x525E0F9C,
+        0x3F4F0A49, 0x075E65E5, 0x4F6DD511, 0x777CBABD,
+        0xDF0AB4F9, 0xE71BDB55, 0xAF286BA1, 0x9739040D,
+        0x59F3BFF2, 0x61E2D05E, 0x29D160AA, 0x11C00F06,
+        0xB9B60142, 0x81A76EEE, 0xC994DE1A, 0xF185B1B6,
+        0x9C94B463, 0xA485DBCF, 0xECB66B3B, 0xD4A70497,
+        0x7CD10AD3, 0x44C0657F, 0x0CF3D58B, 0x34E2BA27,
+        0xD6D1DE21, 0xEEC0B18D, 0xA6F30179, 0x9EE26ED5,
+        0x36946091, 0x0E850F3D, 0x46B6BFC9, 0x7EA7D065,
+        0x13B6D5B0, 0x2BA7BA1C, 0x63940AE8, 0x5B856544,
+        0xF3F36B00, 0xCBE204AC, 0x83D1B458, 0xBBC0DBF4,
+        0x425B0AA5, 0x7A4A6509, 0x3279D5FD, 0x0A68BA51,
+        0xA21EB415, 0x9A0FDBB9, 0xD23C6B4D, 0xEA2D04E1,
+        0x873C0134, 0xBF2D6E98, 0xF71EDE6C, 0xCF0FB1C0,
+        0x6779BF84, 0x5F68D028, 0x175B60DC, 0x2F4A0F70,
+        0xCD796B76, 0xF56804DA, 0xBD5BB42E, 0x854ADB82,
+        0x2D3CD5C6, 0x152DBA6A, 0x5D1E0A9E, 0x650F6532,
+        0x081E60E7, 0x300F0F4B, 0x783CBFBF, 0x402DD013,
+        0xE85BDE57, 0xD04AB1FB, 0x9879010F, 0xA0686EA3,
+        /* T8_5 */
+        0x00000000, 0xEF306B19, 0xDB8CA0C3, 0x34BCCBDA,
+        0xB2F53777, 0x5DC55C6E, 0x697997B4, 0x8649FCAD,
+        0x6006181F, 0x8F367306, 0xBB8AB8DC, 0x54BAD3C5,
+        0xD2F32F68, 0x3DC34471, 0x097F8FAB, 0xE64FE4B2,
+        0xC00C303E, 0x2F3C5B27, 0x1B8090FD, 0xF4B0FBE4,
+        0x72F90749, 0x9DC96C50, 0xA975A78A, 0x4645CC93,
+        0xA00A2821, 0x4F3A4338, 0x7B8688E2, 0x94B6E3FB,
+        0x12FF1F56, 0xFDCF744F, 0xC973BF95, 0x2643D48C,
+        0x85F4168D, 0x6AC47D94, 0x5E78B64E, 0xB148DD57,
+        0x370121FA, 0xD8314AE3, 0xEC8D8139, 0x03BDEA20,
+        0xE5F20E92, 0x0AC2658B, 0x3E7EAE51, 0xD14EC548,
+        0x570739E5, 0xB83752FC, 0x8C8B9926, 0x63BBF23F,
+        0x45F826B3, 0xAAC84DAA, 0x9E748670, 0x7144ED69,
+        0xF70D11C4, 0x183D7ADD, 0x2C81B107, 0xC3B1DA1E,
+        0x25FE3EAC, 0xCACE55B5, 0xFE729E6F, 0x1142F576,
+        0x970B09DB, 0x783B62C2, 0x4C87A918, 0xA3B7C201,
+        0x0E045BEB, 0xE13430F2, 0xD588FB28, 0x3AB89031,
+        0xBCF16C9C, 0x53C10785, 0x677DCC5F, 0x884DA746,
+        0x6E0243F4, 0x813228ED, 0xB58EE337, 0x5ABE882E,
+        0xDCF77483, 0x33C71F9A, 0x077BD440, 0xE84BBF59,
+        0xCE086BD5, 0x213800CC, 0x1584CB16, 0xFAB4A00F,
+        0x7CFD5CA2, 0x93CD37BB, 0xA771FC61, 0x48419778,
+        0xAE0E73CA, 0x413E18D3, 0x7582D309, 0x9AB2B810,
+        0x1CFB44BD, 0xF3CB2FA4, 0xC777E47E, 0x28478F67,
+        0x8BF04D66, 0x64C0267F, 0x507CEDA5, 0xBF4C86BC,
+        0x39057A11, 0xD6351108, 0xE289DAD2, 0x0DB9B1CB,
+        0xEBF65579, 0x04C63E60, 0x307AF5BA, 0xDF4A9EA3,
+        0x5903620E, 0xB6330917, 0x828FC2CD, 0x6DBFA9D4,
+        0x4BFC7D58, 0xA4CC1641, 0x9070DD9B, 0x7F40B682,
+        0xF9094A2F, 0x16392136, 0x2285EAEC, 0xCDB581F5,
+        0x2BFA6547, 0xC4CA0E5E, 0xF076C584, 0x1F46AE9D,
+        0x990F5230, 0x763F3929, 0x4283F2F3, 0xADB399EA,
+        0x1C08B7D6, 0xF338DCCF, 0xC7841715, 0x28B47C0C,
+        0xAEFD80A1, 0x41CDEBB8, 0x75712062, 0x9A414B7B,
+        0x7C0EAFC9, 0x933EC4D0, 0xA7820F0A, 0x48B26413,
+        0xCEFB98BE, 0x21CBF3A7, 0x1577387D, 0xFA475364,
+        0xDC0487E8, 0x3334ECF1, 0x0788272B, 0xE8B84C32,
+        0x6EF1B09F, 0x81C1DB86, 0xB57D105C, 0x5A4D7B45,
+        0xBC029FF7, 0x5332F4EE, 0x678E3F34, 0x88BE542D,
+        0x0EF7A880, 0xE1C7C399, 0xD57B0843, 0x3A4B635A,
+        0x99FCA15B, 0x76CCCA42, 0x42700198, 0xAD406A81,
+        0x2B09962C, 0xC439FD35, 0xF08536EF, 0x1FB55DF6,
+        0xF9FAB944, 0x16CAD25D, 0x22761987, 0xCD46729E,
+        0x4B0F8E33, 0xA43FE52A, 0x90832EF0, 0x7FB345E9,
+        0x59F09165, 0xB6C0FA7C, 0x827C31A6, 0x6D4C5ABF,
+        0xEB05A612, 0x0435CD0B, 0x308906D1, 0xDFB96DC8,
+        0x39F6897A, 0xD6C6E263, 0xE27A29B9, 0x0D4A42A0,
+        0x8B03BE0D, 0x6433D514, 0x508F1ECE, 0xBFBF75D7,
+        0x120CEC3D, 0xFD3C8724, 0xC9804CFE, 0x26B027E7,
+        0xA0F9DB4A, 0x4FC9B053, 0x7B757B89, 0x94451090,
+        0x720AF422, 0x9D3A9F3B, 0xA98654E1, 0x46B63FF8,
+        0xC0FFC355, 0x2FCFA84C, 0x1B736396, 0xF443088F,
+        0xD200DC03, 0x3D30B71A, 0x098C7CC0, 0xE6BC17D9,
+        0x60F5EB74, 0x8FC5806D, 0xBB794BB7, 0x544920AE,
+        0xB206C41C, 0x5D36AF05, 0x698A64DF, 0x86BA0FC6,
+        0x00F3F36B, 0xEFC39872, 0xDB7F53A8, 0x344F38B1,
+        0x97F8FAB0, 0x78C891A9, 0x4C745A73, 0xA344316A,
+        0x250DCDC7, 0xCA3DA6DE, 0xFE816D04, 0x11B1061D,
+        0xF7FEE2AF, 0x18CE89B6, 0x2C72426C, 0xC3422975,
+        0x450BD5D8, 0xAA3BBEC1, 0x9E87751B, 0x71B71E02,
+        0x57F4CA8E, 0xB8C4A197, 0x8C786A4D, 0x63480154,
+        0xE501FDF9, 0x0A3196E0, 0x3E8D5D3A, 0xD1BD3623,
+        0x37F2D291, 0xD8C2B988, 0xEC7E7252, 0x034E194B,
+        0x8507E5E6, 0x6A378EFF, 0x5E8B4525, 0xB1BB2E3C,
+        /* T8_6 */
+        0x00000000, 0x68032CC8, 0xD0065990, 0xB8057558,
+        0xA5E0C5D1, 0xCDE3E919, 0x75E69C41, 0x1DE5B089,
+        0x4E2DFD53, 0x262ED19B, 0x9E2BA4C3, 0xF628880B,
+        0xEBCD3882, 0x83CE144A, 0x3BCB6112, 0x53C84DDA,
+        0x9C5BFAA6, 0xF458D66E, 0x4C5DA336, 0x245E8FFE,
+        0x39BB3F77, 0x51B813BF, 0xE9BD66E7, 0x81BE4A2F,
+        0xD27607F5, 0xBA752B3D, 0x02705E65, 0x6A7372AD,
+        0x7796C224, 0x1F95EEEC, 0xA7909BB4, 0xCF93B77C,
+        0x3D5B83BD, 0x5558AF75, 0xED5DDA2D, 0x855EF6E5,
+        0x98BB466C, 0xF0B86AA4, 0x48BD1FFC, 0x20BE3334,
+        0x73767EEE, 0x1B755226, 0xA370277E, 0xCB730BB6,
+        0xD696BB3F, 0xBE9597F7, 0x0690E2AF, 0x6E93CE67,
+        0xA100791B, 0xC90355D3, 0x7106208B, 0x19050C43,
+        0x04E0BCCA, 0x6CE39002, 0xD4E6E55A, 0xBCE5C992,
+        0xEF2D8448, 0x872EA880, 0x3F2BDDD8, 0x5728F110,
+        0x4ACD4199, 0x22CE6D51, 0x9ACB1809, 0xF2C834C1,
+        0x7AB7077A, 0x12B42BB2, 0xAAB15EEA, 0xC2B27222,
+        0xDF57C2AB, 0xB754EE63, 0x0F519B3B, 0x6752B7F3,
+        0x349AFA29, 0x5C99D6E1, 0xE49CA3B9, 0x8C9F8F71,
+        0x917A3FF8, 0xF9791330, 0x417C6668, 0x297F4AA0,
+        0xE6ECFDDC, 0x8EEFD114, 0x36EAA44C, 0x5EE98884,
+        0x430C380D, 0x2B0F14C5, 0x930A619D, 0xFB094D55,
+        0xA8C1008F, 0xC0C22C47, 0x78C7591F, 0x10C475D7,
+        0x0D21C55E, 0x6522E996, 0xDD279CCE, 0xB524B006,
+        0x47EC84C7, 0x2FEFA80F, 0x97EADD57, 0xFFE9F19F,
+        0xE20C4116, 0x8A0F6DDE, 0x320A1886, 0x5A09344E,
+        0x09C17994, 0x61C2555C, 0xD9C72004, 0xB1C40CCC,
+        0xAC21BC45, 0xC422908D, 0x7C27E5D5, 0x1424C91D,
+        0xDBB77E61, 0xB3B452A9, 0x0BB127F1, 0x63B20B39,
+        0x7E57BBB0, 0x16549778, 0xAE51E220, 0xC652CEE8,
+        0x959A8332, 0xFD99AFFA, 0x459CDAA2, 0x2D9FF66A,
+        0x307A46E3, 0x58796A2B, 0xE07C1F73, 0x887F33BB,
+        0xF56E0EF4, 0x9D6D223C, 0x25685764, 0x4D6B7BAC,
+        0x508ECB25, 0x388DE7ED, 0x808892B5, 0xE88BBE7D,
+        0xBB43F3A7, 0xD340DF6F, 0x6B45AA37, 0x034686FF,
+        0x1EA33676, 0x76A01ABE, 0xCEA56FE6, 0xA6A6432E,
+        0x6935F452, 0x0136D89A, 0xB933ADC2, 0xD130810A,
+        0xCCD53183, 0xA4D61D4B, 0x1CD36813, 0x74D044DB,
+        0x27180901, 0x4F1B25C9, 0xF71E5091, 0x9F1D7C59,
+        0x82F8CCD0, 0xEAFBE018, 0x52FE9540, 0x3AFDB988,
+        0xC8358D49, 0xA036A181, 0x1833D4D9, 0x7030F811,
+        0x6DD54898, 0x05D66450, 0xBDD31108, 0xD5D03DC0,
+        0x8618701A, 0xEE1B5CD2, 0x561E298A, 0x3E1D0542,
+        0x23F8B5CB, 0x4BFB9903, 0xF3FEEC5B, 0x9BFDC093,
+        0x546E77EF, 0x3C6D5B27, 0x84682E7F, 0xEC6B02B7,
+        0xF18EB23E, 0x998D9EF6, 0x2188EBAE, 0x498BC766,
+        0x1A438ABC, 0x7240A674, 0xCA45D32C, 0xA246FFE4,
+        0xBFA34F6D, 0xD7A063A5, 0x6FA516FD, 0x07A63A35,
+        0x8FD9098E, 0xE7DA2546, 0x5FDF501E, 0x37DC7CD6,
+        0x2A39CC5F, 0x423AE097, 0xFA3F95CF, 0x923CB907,
+        0xC1F4F4DD, 0xA9F7D815, 0x11F2AD4D, 0x79F18185,
+        0x6414310C, 0x0C171DC4, 0xB412689C, 0xDC114454,
+        0x1382F328, 0x7B81DFE0, 0xC384AAB8, 0xAB878670,
+        0xB66236F9, 0xDE611A31, 0x66646F69, 0x0E6743A1,
+        0x5DAF0E7B, 0x35AC22B3, 0x8DA957EB, 0xE5AA7B23,
+        0xF84FCBAA, 0x904CE762, 0x2849923A, 0x404ABEF2,
+        0xB2828A33, 0xDA81A6FB, 0x6284D3A3, 0x0A87FF6B,
+        0x17624FE2, 0x7F61632A, 0xC7641672, 0xAF673ABA,
+        0xFCAF7760, 0x94AC5BA8, 0x2CA92EF0, 0x44AA0238,
+        0x594FB2B1, 0x314C9E79, 0x8949EB21, 0xE14AC7E9,
+        0x2ED97095, 0x46DA5C5D, 0xFEDF2905, 0x96DC05CD,
+        0x8B39B544, 0xE33A998C, 0x5B3FECD4, 0x333CC01C,
+        0x60F48DC6, 0x08F7A10E, 0xB0F2D456, 0xD8F1F89E,
+        0xC5144817, 0xAD1764DF, 0x15121187, 0x7D113D4F,
+        /* T8_7 */
+        0x00000000, 0x493C7D27, 0x9278FA4E, 0xDB448769,
+        0x211D826D, 0x6821FF4A, 0xB3657823, 0xFA590504,
+        0x423B04DA, 0x0B0779FD, 0xD043FE94, 0x997F83B3,
+        0x632686B7, 0x2A1AFB90, 0xF15E7CF9, 0xB86201DE,
+        0x847609B4, 0xCD4A7493, 0x160EF3FA, 0x5F328EDD,
+        0xA56B8BD9, 0xEC57F6FE, 0x37137197, 0x7E2F0CB0,
+        0xC64D0D6E, 0x8F717049, 0x5435F720, 0x1D098A07,
+        0xE7508F03, 0xAE6CF224, 0x7528754D, 0x3C14086A,
+        0x0D006599, 0x443C18BE, 0x9F789FD7, 0xD644E2F0,
+        0x2C1DE7F4, 0x65219AD3, 0xBE651DBA, 0xF759609D,
+        0x4F3B6143, 0x06071C64, 0xDD439B0D, 0x947FE62A,
+        0x6E26E32E, 0x271A9E09, 0xFC5E1960, 0xB5626447,
+        0x89766C2D, 0xC04A110A, 0x1B0E9663, 0x5232EB44,
+        0xA86BEE40, 0xE1579367, 0x3A13140E, 0x732F6929,
+        0xCB4D68F7, 0x827115D0, 0x593592B9, 0x1009EF9E,
+        0xEA50EA9A, 0xA36C97BD, 0x782810D4, 0x31146DF3,
+        0x1A00CB32, 0x533CB615, 0x8878317C, 0xC1444C5B,
+        0x3B1D495F, 0x72213478, 0xA965B311, 0xE059CE36,
+        0x583BCFE8, 0x1107B2CF, 0xCA4335A6, 0x837F4881,
+        0x79264D85, 0x301A30A2, 0xEB5EB7CB, 0xA262CAEC,
+        0x9E76C286, 0xD74ABFA1, 0x0C0E38C8, 0x453245EF,
+        0xBF6B40EB, 0xF6573DCC, 0x2D13BAA5, 0x642FC782,
+        0xDC4DC65C, 0x9571BB7B, 0x4E353C12, 0x07094135,
+        0xFD504431, 0xB46C3916, 0x6F28BE7F, 0x2614C358,
+        0x1700AEAB, 0x5E3CD38C, 0x857854E5, 0xCC4429C2,
+        0x361D2CC6, 0x7F2151E1, 0xA465D688, 0xED59ABAF,
+        0x553BAA71, 0x1C07D756, 0xC743503F, 0x8E7F2D18,
+        0x7426281C, 0x3D1A553B, 0xE65ED252, 0xAF62AF75,
+        0x9376A71F, 0xDA4ADA38, 0x010E5D51, 0x48322076,
+        0xB26B2572, 0xFB575855, 0x2013DF3C, 0x692FA21B,
+        0xD14DA3C5, 0x9871DEE2, 0x4335598B, 0x0A0924AC,
+        0xF05021A8, 0xB96C5C8F, 0x6228DBE6, 0x2B14A6C1,
+        0x34019664, 0x7D3DEB43, 0xA6796C2A, 0xEF45110D,
+        0x151C1409, 0x5C20692E, 0x8764EE47, 0xCE589360,
+        0x763A92BE, 0x3F06EF99, 0xE44268F0, 0xAD7E15D7,
+        0x572710D3, 0x1E1B6DF4, 0xC55FEA9D, 0x8C6397BA,
+        0xB0779FD0, 0xF94BE2F7, 0x220F659E, 0x6B3318B9,
+        0x916A1DBD, 0xD856609A, 0x0312E7F3, 0x4A2E9AD4,
+        0xF24C9B0A, 0xBB70E62D, 0x60346144, 0x29081C63,
+        0xD3511967, 0x9A6D6440, 0x4129E329, 0x08159E0E,
+        0x3901F3FD, 0x703D8EDA, 0xAB7909B3, 0xE2457494,
+        0x181C7190, 0x51200CB7, 0x8A648BDE, 0xC358F6F9,
+        0x7B3AF727, 0x32068A00, 0xE9420D69, 0xA07E704E,
+        0x5A27754A, 0x131B086D, 0xC85F8F04, 0x8163F223,
+        0xBD77FA49, 0xF44B876E, 0x2F0F0007, 0x66337D20,
+        0x9C6A7824, 0xD5560503, 0x0E12826A, 0x472EFF4D,
+        0xFF4CFE93, 0xB67083B4, 0x6D3404DD, 0x240879FA,
+        0xDE517CFE, 0x976D01D9, 0x4C2986B0, 0x0515FB97,
+        0x2E015D56, 0x673D2071, 0xBC79A718, 0xF545DA3F,
+        0x0F1CDF3B, 0x4620A21C, 0x9D642575, 0xD4585852,
+        0x6C3A598C, 0x250624AB, 0xFE42A3C2, 0xB77EDEE5,
+        0x4D27DBE1, 0x041BA6C6, 0xDF5F21AF, 0x96635C88,
+        0xAA7754E2, 0xE34B29C5, 0x380FAEAC, 0x7133D38B,
+        0x8B6AD68F, 0xC256ABA8, 0x19122CC1, 0x502E51E6,
+        0xE84C5038, 0xA1702D1F, 0x7A34AA76, 0x3308D751,
+        0xC951D255, 0x806DAF72, 0x5B29281B, 0x1215553C,
+        0x230138CF, 0x6A3D45E8, 0xB179C281, 0xF845BFA6,
+        0x021CBAA2, 0x4B20C785, 0x906440EC, 0xD9583DCB,
+        0x613A3C15, 0x28064132, 0xF342C65B, 0xBA7EBB7C,
+        0x4027BE78, 0x091BC35F, 0xD25F4436, 0x9B633911,
+        0xA777317B, 0xEE4B4C5C, 0x350FCB35, 0x7C33B612,
+        0x866AB316, 0xCF56CE31, 0x14124958, 0x5D2E347F,
+        0xE54C35A1, 0xAC704886, 0x7734CFEF, 0x3E08B2C8,
+        0xC451B7CC, 0x8D6DCAEB, 0x56294D82, 0x1F1530A5
+    };
+}

http://git-wip-us.apache.org/repos/asf/kafka/blob/6feaa8a5/clients/src/test/java/org/apache/kafka/common/record/FileRecordsTest.java
----------------------------------------------------------------------
diff --git a/clients/src/test/java/org/apache/kafka/common/record/FileRecordsTest.java b/clients/src/test/java/org/apache/kafka/common/record/FileRecordsTest.java
index 7e780dd..294f2f8 100644
--- a/clients/src/test/java/org/apache/kafka/common/record/FileRecordsTest.java
+++ b/clients/src/test/java/org/apache/kafka/common/record/FileRecordsTest.java
@@ -33,6 +33,7 @@ import java.util.List;
 
 import static org.apache.kafka.test.TestUtils.tempFile;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
@@ -370,14 +371,30 @@ public class FileRecordsTest {
         int i = 0;
         for (RecordBatch batch : convertedRecords.batches()) {
             assertTrue("Magic byte should be lower than or equal to " + magicByte, batch.magic() <= magicByte);
+            if (batch.magic() == RecordBatch.MAGIC_VALUE_V0)
+                assertEquals(TimestampType.NO_TIMESTAMP_TYPE, batch.timestampType());
+            else
+                assertEquals(TimestampType.CREATE_TIME, batch.timestampType());
             assertEquals("Compression type should not be affected by conversion", compressionType, batch.compressionType());
             for (Record record : batch) {
                 assertTrue("Inner record should have magic " + magicByte, record.hasMagic(batch.magic()));
                 assertEquals("Offset should not change", initialOffsets.get(i).longValue(), record.offset());
                 assertEquals("Key should not change", initialRecords.get(i).key(), record.key());
                 assertEquals("Value should not change", initialRecords.get(i).value(), record.value());
-                if (batch.magic() > RecordBatch.MAGIC_VALUE_V0)
+                assertFalse(record.hasTimestampType(TimestampType.LOG_APPEND_TIME));
+                if (batch.magic() == RecordBatch.MAGIC_VALUE_V0) {
+                    assertEquals(RecordBatch.NO_TIMESTAMP, record.timestamp());
+                    assertFalse(record.hasTimestampType(TimestampType.CREATE_TIME));
+                    assertTrue(record.hasTimestampType(TimestampType.NO_TIMESTAMP_TYPE));
+                } else if (batch.magic() == RecordBatch.MAGIC_VALUE_V1) {
                     assertEquals("Timestamp should not change", initialRecords.get(i).timestamp(), record.timestamp());
+                    assertTrue(record.hasTimestampType(TimestampType.CREATE_TIME));
+                    assertFalse(record.hasTimestampType(TimestampType.NO_TIMESTAMP_TYPE));
+                } else {
+                    assertEquals("Timestamp should not change", initialRecords.get(i).timestamp(), record.timestamp());
+                    assertFalse(record.hasTimestampType(TimestampType.CREATE_TIME));
+                    assertFalse(record.hasTimestampType(TimestampType.NO_TIMESTAMP_TYPE));
+                }
                 i += 1;
             }
         }

http://git-wip-us.apache.org/repos/asf/kafka/blob/6feaa8a5/clients/src/test/java/org/apache/kafka/common/record/MemoryRecordsTest.java
----------------------------------------------------------------------
diff --git a/clients/src/test/java/org/apache/kafka/common/record/MemoryRecordsTest.java b/clients/src/test/java/org/apache/kafka/common/record/MemoryRecordsTest.java
index 8cead03..2dd5ab0 100644
--- a/clients/src/test/java/org/apache/kafka/common/record/MemoryRecordsTest.java
+++ b/clients/src/test/java/org/apache/kafka/common/record/MemoryRecordsTest.java
@@ -102,6 +102,10 @@ public class MemoryRecordsTest {
                     assertEquals(RecordBatch.NO_SEQUENCE, batch.baseSequence());
                     assertEquals(RecordBatch.UNKNOWN_PARTITION_LEADER_EPOCH, batch.partitionLeaderEpoch());
                     assertNull(batch.countOrNull());
+                    if (magic == RecordBatch.MAGIC_VALUE_V0)
+                        assertEquals(TimestampType.NO_TIMESTAMP_TYPE, batch.timestampType());
+                    else
+                        assertEquals(TimestampType.CREATE_TIME, batch.timestampType());
                 }
 
                 int recordCount = 0;
@@ -116,10 +120,18 @@ public class MemoryRecordsTest {
                     if (magic >= RecordBatch.MAGIC_VALUE_V2)
                         assertEquals(firstSequence + total, record.sequence());
 
-                    if (magic > RecordBatch.MAGIC_VALUE_V0) {
+                    assertFalse(record.hasTimestampType(TimestampType.LOG_APPEND_TIME));
+                    if (magic == RecordBatch.MAGIC_VALUE_V0) {
+                        assertEquals(RecordBatch.NO_TIMESTAMP, record.timestamp());
+                        assertFalse(record.hasTimestampType(TimestampType.CREATE_TIME));
+                        assertTrue(record.hasTimestampType(TimestampType.NO_TIMESTAMP_TYPE));
+                    } else {
                         assertEquals(records[total].timestamp(), record.timestamp());
+                        assertFalse(record.hasTimestampType(TimestampType.NO_TIMESTAMP_TYPE));
                         if (magic < RecordBatch.MAGIC_VALUE_V2)
-                            assertTrue(record.hasTimestampType(batch.timestampType()));
+                            assertTrue(record.hasTimestampType(TimestampType.CREATE_TIME));
+                        else
+                            assertFalse(record.hasTimestampType(TimestampType.CREATE_TIME));
                     }
 
                     total++;
@@ -141,6 +153,42 @@ public class MemoryRecordsTest {
         assertFalse(builder.hasRoomFor(1L, "b".getBytes(), "2".getBytes()));
     }
 
+    /**
+     * This test verifies that the checksum returned for various versions matches hardcoded values to catch unintentional
+     * changes to how the checksum is computed.
+     */
+    @Test
+    public void testChecksum() {
+        // we get reasonable coverage with uncompressed and one compression type
+        if (compression != CompressionType.NONE && compression != CompressionType.LZ4)
+            return;
+
+        SimpleRecord[] records = {
+            new SimpleRecord(283843L, "key1".getBytes(), "value1".getBytes()),
+            new SimpleRecord(1234L, "key2".getBytes(), "value2".getBytes())
+        };
+        RecordBatch batch = MemoryRecords.withRecords(magic, compression, records).batches().iterator().next();
+        long expectedChecksum;
+        if (magic == RecordBatch.MAGIC_VALUE_V0) {
+            if (compression == CompressionType.NONE)
+                expectedChecksum = 1978725405L;
+            else
+                expectedChecksum = 66944826L;
+        } else if (magic == RecordBatch.MAGIC_VALUE_V1) {
+            if (compression == CompressionType.NONE)
+                expectedChecksum = 109425508L;
+            else
+                expectedChecksum = 1407303399L;
+        } else {
+            if (compression == CompressionType.NONE)
+                expectedChecksum = 3851219455L;
+            else
+                expectedChecksum = 2745969314L;
+        }
+        assertEquals("Unexpected checksum for magic " + magic + " and compression type " + compression,
+                expectedChecksum, batch.checksum());
+    }
+
     @Test
     public void testFilterTo() {
         ByteBuffer buffer = ByteBuffer.allocate(2048);

http://git-wip-us.apache.org/repos/asf/kafka/blob/6feaa8a5/clients/src/test/java/org/apache/kafka/common/record/SimpleLegacyRecordTest.java
----------------------------------------------------------------------
diff --git a/clients/src/test/java/org/apache/kafka/common/record/SimpleLegacyRecordTest.java b/clients/src/test/java/org/apache/kafka/common/record/SimpleLegacyRecordTest.java
index dd718bf..b409af6 100644
--- a/clients/src/test/java/org/apache/kafka/common/record/SimpleLegacyRecordTest.java
+++ b/clients/src/test/java/org/apache/kafka/common/record/SimpleLegacyRecordTest.java
@@ -40,7 +40,7 @@ public class SimpleLegacyRecordTest {
         buffer.flip();
 
         MemoryRecords records = MemoryRecords.readableRecords(buffer);
-        for (Record record : records.records())
+        if (records.records().iterator().hasNext())
             fail("Iteration should have caused invalid record error");
     }
 
@@ -61,7 +61,7 @@ public class SimpleLegacyRecordTest {
         buffer.flip();
 
         MemoryRecords records = MemoryRecords.readableRecords(buffer);
-        for (Record record : records.records())
+        if (records.records().iterator().hasNext())
             fail("Iteration should have caused invalid record error");
     }
 

http://git-wip-us.apache.org/repos/asf/kafka/blob/6feaa8a5/clients/src/test/java/org/apache/kafka/common/utils/ChecksumsTest.java
----------------------------------------------------------------------
diff --git a/clients/src/test/java/org/apache/kafka/common/utils/ChecksumsTest.java b/clients/src/test/java/org/apache/kafka/common/utils/ChecksumsTest.java
new file mode 100644
index 0000000..f13e0ef
--- /dev/null
+++ b/clients/src/test/java/org/apache/kafka/common/utils/ChecksumsTest.java
@@ -0,0 +1,93 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.kafka.common.utils;
+
+import org.junit.Test;
+
+import java.nio.ByteBuffer;
+import java.util.zip.Checksum;
+
+import static org.junit.Assert.assertEquals;
+
+public class ChecksumsTest {
+
+    @Test
+    public void testUpdateByteBuffer() {
+        byte[] bytes = new byte[]{0, 1, 2, 3, 4, 5};
+        doTestUpdateByteBuffer(bytes, ByteBuffer.allocate(bytes.length));
+        doTestUpdateByteBuffer(bytes, ByteBuffer.allocateDirect(bytes.length));
+    }
+
+    private void doTestUpdateByteBuffer(byte[] bytes, ByteBuffer buffer) {
+        buffer.put(bytes);
+        buffer.flip();
+        Checksum bufferCrc = new Crc32();
+        Checksums.update(bufferCrc, buffer, buffer.remaining());
+        assertEquals(Crc32.crc32(bytes), bufferCrc.getValue());
+        assertEquals(0, buffer.position());
+    }
+
+    @Test
+    public void testUpdateByteBufferWithOffsetPosition() {
+        byte[] bytes = new byte[]{-2, -1, 0, 1, 2, 3, 4, 5};
+        doTestUpdateByteBufferWithOffsetPosition(bytes, ByteBuffer.allocate(bytes.length), 2);
+        doTestUpdateByteBufferWithOffsetPosition(bytes, ByteBuffer.allocateDirect(bytes.length), 2);
+    }
+
+    @Test
+    public void testUpdateInt() {
+        final int value = 1000;
+        final ByteBuffer buffer = ByteBuffer.allocate(4);
+        buffer.putInt(value);
+
+        Checksum crc1 = Crc32C.create();
+        Checksum crc2 = Crc32C.create();
+
+        Checksums.updateInt(crc1, value);
+        crc2.update(buffer.array(), buffer.arrayOffset(), 4);
+
+        assertEquals("Crc values should be the same", crc1.getValue(), crc2.getValue());
+    }
+
+    @Test
+    public void testUpdateLong() {
+        final long value = Integer.MAX_VALUE + 1;
+        final ByteBuffer buffer = ByteBuffer.allocate(8);
+        buffer.putLong(value);
+
+        Checksum crc1 = new Crc32();
+        Checksum crc2 = new Crc32();
+
+        Checksums.updateLong(crc1, value);
+        crc2.update(buffer.array(), buffer.arrayOffset(), 8);
+
+        assertEquals("Crc values should be the same", crc1.getValue(), crc2.getValue());
+    }
+
+    private void doTestUpdateByteBufferWithOffsetPosition(byte[] bytes, ByteBuffer buffer, int offset) {
+        buffer.put(bytes);
+        buffer.flip();
+        buffer.position(offset);
+
+        Checksum bufferCrc = Crc32C.create();
+        Checksums.update(bufferCrc, buffer, buffer.remaining());
+        assertEquals(Crc32C.compute(bytes, offset, buffer.remaining()), bufferCrc.getValue());
+        assertEquals(offset, buffer.position());
+    }
+
+}

http://git-wip-us.apache.org/repos/asf/kafka/blob/6feaa8a5/clients/src/test/java/org/apache/kafka/common/utils/Crc32CTest.java
----------------------------------------------------------------------
diff --git a/clients/src/test/java/org/apache/kafka/common/utils/Crc32CTest.java b/clients/src/test/java/org/apache/kafka/common/utils/Crc32CTest.java
new file mode 100644
index 0000000..e248d05
--- /dev/null
+++ b/clients/src/test/java/org/apache/kafka/common/utils/Crc32CTest.java
@@ -0,0 +1,52 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.kafka.common.utils;
+
+import org.junit.Test;
+
+import java.util.zip.Checksum;
+
+import static org.junit.Assert.assertEquals;
+
+public class Crc32CTest {
+
+    @Test
+    public void testUpdate() {
+        final byte[] bytes = "Any String you want".getBytes();
+        final int len = bytes.length;
+
+        Checksum crc1 = Crc32C.create();
+        Checksum crc2 = Crc32C.create();
+        Checksum crc3 = Crc32C.create();
+
+        crc1.update(bytes, 0, len);
+        for (int i = 0; i < len; i++)
+            crc2.update(bytes[i]);
+        crc3.update(bytes, 0, len / 2);
+        crc3.update(bytes, len / 2, len - len / 2);
+
+        assertEquals("Crc values should be the same", crc1.getValue(), crc2.getValue());
+        assertEquals("Crc values should be the same", crc1.getValue(), crc3.getValue());
+    }
+
+    @Test
+    public void testValue() {
+        final byte[] bytes = "Some String".getBytes();
+        assertEquals(608512271, Crc32C.compute(bytes, 0, bytes.length));
+    }
+
+}

http://git-wip-us.apache.org/repos/asf/kafka/blob/6feaa8a5/clients/src/test/java/org/apache/kafka/common/utils/Crc32Test.java
----------------------------------------------------------------------
diff --git a/clients/src/test/java/org/apache/kafka/common/utils/Crc32Test.java b/clients/src/test/java/org/apache/kafka/common/utils/Crc32Test.java
index adb5da7..7e58a17 100644
--- a/clients/src/test/java/org/apache/kafka/common/utils/Crc32Test.java
+++ b/clients/src/test/java/org/apache/kafka/common/utils/Crc32Test.java
@@ -18,44 +18,35 @@ package org.apache.kafka.common.utils;
 
 import org.junit.Test;
 
-import java.nio.ByteBuffer;
+import java.util.zip.Checksum;
 
 import static org.junit.Assert.assertEquals;
 
 public class Crc32Test {
 
     @Test
-    public void testUpdateByteBuffer() {
-        byte[] bytes = new byte[]{0, 1, 2, 3, 4, 5};
-        doTestUpdateByteBuffer(bytes, ByteBuffer.allocate(bytes.length));
-        doTestUpdateByteBuffer(bytes, ByteBuffer.allocateDirect(bytes.length));
-    }
-
-    private void doTestUpdateByteBuffer(byte[] bytes, ByteBuffer buffer) {
-        buffer.put(bytes);
-        buffer.flip();
-        Crc32 bufferCrc = new Crc32();
-        bufferCrc.update(buffer, buffer.remaining());
-        assertEquals(Crc32.crc32(bytes), bufferCrc.getValue());
-        assertEquals(0, buffer.position());
+    public void testUpdate() {
+        final byte[] bytes = "Any String you want".getBytes();
+        final int len = bytes.length;
+
+        Checksum crc1 = Crc32C.create();
+        Checksum crc2 = Crc32C.create();
+        Checksum crc3 = Crc32C.create();
+
+        crc1.update(bytes, 0, len);
+        for (int i = 0; i < len; i++)
+            crc2.update(bytes[i]);
+        crc3.update(bytes, 0, len / 2);
+        crc3.update(bytes, len / 2, len - len / 2);
+
+        assertEquals("Crc values should be the same", crc1.getValue(), crc2.getValue());
+        assertEquals("Crc values should be the same", crc1.getValue(), crc3.getValue());
     }
 
     @Test
-    public void testUpdateByteBufferWithOffsetPosition() {
-        byte[] bytes = new byte[]{-2, -1, 0, 1, 2, 3, 4, 5};
-        doTestUpdateByteBufferWithOffsetPosition(bytes, ByteBuffer.allocate(bytes.length), 2);
-        doTestUpdateByteBufferWithOffsetPosition(bytes, ByteBuffer.allocateDirect(bytes.length), 2);
-    }
-
-    private void doTestUpdateByteBufferWithOffsetPosition(byte[] bytes, ByteBuffer buffer, int offset) {
-        buffer.put(bytes);
-        buffer.flip();
-        buffer.position(offset);
-
-        Crc32 bufferCrc = new Crc32();
-        bufferCrc.update(buffer, buffer.remaining());
-        assertEquals(Crc32.crc32(bytes, offset, buffer.remaining()), bufferCrc.getValue());
-        assertEquals(offset, buffer.position());
+    public void testValue() {
+        final byte[] bytes = "Some String".getBytes();
+        assertEquals(2021503672, Crc32.crc32(bytes));
     }
 
-}
\ No newline at end of file
+}

http://git-wip-us.apache.org/repos/asf/kafka/blob/6feaa8a5/clients/src/test/java/org/apache/kafka/common/utils/CrcTest.java
----------------------------------------------------------------------
diff --git a/clients/src/test/java/org/apache/kafka/common/utils/CrcTest.java b/clients/src/test/java/org/apache/kafka/common/utils/CrcTest.java
deleted file mode 100644
index 7f3132e..0000000
--- a/clients/src/test/java/org/apache/kafka/common/utils/CrcTest.java
+++ /dev/null
@@ -1,59 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You 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 org.apache.kafka.common.utils;
-
-import static org.junit.Assert.assertEquals;
-import org.junit.Test;
-
-import java.nio.ByteBuffer;
-
-public class CrcTest {
-
-    @Test
-    public void testUpdate() {
-        final byte[] bytes = "Any String you want".getBytes();
-        final int len = bytes.length;
-
-        Crc32 crc1 = new Crc32();
-        Crc32 crc2 = new Crc32();
-        Crc32 crc3 = new Crc32();
-
-        crc1.update(bytes, 0, len);
-        for (int i = 0; i < len; i++)
-            crc2.update(bytes[i]);
-        crc3.update(bytes, 0, len / 2);
-        crc3.update(bytes, len / 2, len - len / 2);
-
-        assertEquals("Crc values should be the same", crc1.getValue(), crc2.getValue());
-        assertEquals("Crc values should be the same", crc1.getValue(), crc3.getValue());
-    }
-
-    @Test
-    public void testUpdateInt() {
-        final int value = 1000;
-        final ByteBuffer buffer = ByteBuffer.allocate(4);
-        buffer.putInt(value);
-
-        Crc32 crc1 = new Crc32();
-        Crc32 crc2 = new Crc32();
-
-        crc1.updateInt(value);
-        crc2.update(buffer.array(), buffer.arrayOffset(), 4);
-
-        assertEquals("Crc values should be the same", crc1.getValue(), crc2.getValue());
-    }
-}


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