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From szets...@apache.org
Subject svn commit: r1365591 - in /hadoop/common/branches/branch-1: ./ src/core/org/apache/hadoop/fs/ src/core/org/apache/hadoop/util/ src/test/org/apache/hadoop/util/
Date Wed, 25 Jul 2012 14:01:29 GMT
Author: szetszwo
Date: Wed Jul 25 14:01:28 2012
New Revision: 1365591

URL: http://svn.apache.org/viewvc?rev=1365591&view=rev
Log:
HADOOP-8617. Backport HADOOP-6148, HADOOP-6166 and HADOOP-7333 for a pure Java CRC32 calculator
implementation.  Contributed by Brandon Li

Added:
    hadoop/common/branches/branch-1/src/core/org/apache/hadoop/util/PureJavaCrc32.java
    hadoop/common/branches/branch-1/src/test/org/apache/hadoop/util/TestPureJavaCrc32.java
Modified:
    hadoop/common/branches/branch-1/CHANGES.txt
    hadoop/common/branches/branch-1/src/core/org/apache/hadoop/fs/ChecksumFileSystem.java
    hadoop/common/branches/branch-1/src/core/org/apache/hadoop/util/DataChecksum.java

Modified: hadoop/common/branches/branch-1/CHANGES.txt
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-1/CHANGES.txt?rev=1365591&r1=1365590&r2=1365591&view=diff
==============================================================================
--- hadoop/common/branches/branch-1/CHANGES.txt (original)
+++ hadoop/common/branches/branch-1/CHANGES.txt Wed Jul 25 14:01:28 2012
@@ -46,6 +46,9 @@ Release 1.2.0 - unreleased
     MAPREDUCE-4415. Backport the Job.getInstance methods from
     MAPREDUCE-1505 to branch-1. (harsh)
 
+    HADOOP-8617. Backport HADOOP-6148, HADOOP-6166 and HADOOP-7333 for a pure
+    Java CRC32 calculator implementation.  (Brandon Li via szetszwo)
+
   BUG FIXES
 
     HADOOP-8460. Document proper setting of HADOOP_PID_DIR and

Modified: hadoop/common/branches/branch-1/src/core/org/apache/hadoop/fs/ChecksumFileSystem.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-1/src/core/org/apache/hadoop/fs/ChecksumFileSystem.java?rev=1365591&r1=1365590&r2=1365591&view=diff
==============================================================================
--- hadoop/common/branches/branch-1/src/core/org/apache/hadoop/fs/ChecksumFileSystem.java
(original)
+++ hadoop/common/branches/branch-1/src/core/org/apache/hadoop/fs/ChecksumFileSystem.java
Wed Jul 25 14:01:28 2012
@@ -20,13 +20,13 @@ package org.apache.hadoop.fs;
 
 import java.io.*;
 import java.util.Arrays;
-import java.util.zip.CRC32;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.util.Progressable;
+import org.apache.hadoop.util.PureJavaCrc32;
 import org.apache.hadoop.util.StringUtils;
 
 /****************************************************************
@@ -135,7 +135,7 @@ public abstract class ChecksumFileSystem
         if (!Arrays.equals(version, CHECKSUM_VERSION))
           throw new IOException("Not a checksum file: "+sumFile);
         this.bytesPerSum = sums.readInt();
-        set(fs.verifyChecksum, new CRC32(), bytesPerSum, 4);
+        set(fs.verifyChecksum, new PureJavaCrc32(), bytesPerSum, 4);
       } catch (FileNotFoundException e) {         // quietly ignore
         set(fs.verifyChecksum, null, 1, 0);
       } catch (IOException e) {                   // loudly ignore
@@ -330,7 +330,7 @@ public abstract class ChecksumFileSystem
                           long blockSize,
                           Progressable progress)
       throws IOException {
-      super(new CRC32(), fs.getBytesPerSum(), 4);
+      super(new PureJavaCrc32(), fs.getBytesPerSum(), 4);
       int bytesPerSum = fs.getBytesPerSum();
       this.datas = fs.getRawFileSystem().create(file, overwrite, bufferSize, 
                                          replication, blockSize, progress);

Modified: hadoop/common/branches/branch-1/src/core/org/apache/hadoop/util/DataChecksum.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-1/src/core/org/apache/hadoop/util/DataChecksum.java?rev=1365591&r1=1365590&r2=1365591&view=diff
==============================================================================
--- hadoop/common/branches/branch-1/src/core/org/apache/hadoop/util/DataChecksum.java (original)
+++ hadoop/common/branches/branch-1/src/core/org/apache/hadoop/util/DataChecksum.java Wed
Jul 25 14:01:28 2012
@@ -19,8 +19,6 @@
 package org.apache.hadoop.util;
 
 import java.util.zip.Checksum;
-import java.util.zip.CRC32;
-
 import java.io.*;
 
 /**
@@ -51,7 +49,7 @@ public class DataChecksum implements Che
       return new DataChecksum( CHECKSUM_NULL, new ChecksumNull(), 
                                CHECKSUM_NULL_SIZE, bytesPerChecksum );
     case CHECKSUM_CRC32 :
-      return new DataChecksum( CHECKSUM_CRC32, new CRC32(), 
+      return new DataChecksum( CHECKSUM_CRC32, new PureJavaCrc32(), 
                                CHECKSUM_CRC32_SIZE, bytesPerChecksum );
     default:
       return null;  

Added: hadoop/common/branches/branch-1/src/core/org/apache/hadoop/util/PureJavaCrc32.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-1/src/core/org/apache/hadoop/util/PureJavaCrc32.java?rev=1365591&view=auto
==============================================================================
--- hadoop/common/branches/branch-1/src/core/org/apache/hadoop/util/PureJavaCrc32.java (added)
+++ hadoop/common/branches/branch-1/src/core/org/apache/hadoop/util/PureJavaCrc32.java Wed
Jul 25 14:01:28 2012
@@ -0,0 +1,615 @@
+/**
+ * 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.hadoop.util;
+
+import java.util.zip.Checksum;
+
+/**
+ * A pure-java implementation of the CRC32 checksum that uses
+ * the same polynomial as the built-in native CRC32.
+ *
+ * This is to avoid the JNI overhead for certain uses of Checksumming
+ * where many small pieces of data are checksummed in succession.
+ *
+ * The current version is ~10x to 1.8x as fast as Sun's native
+ * java.util.zip.CRC32 in Java 1.6
+ *
+ * @see java.util.zip.CRC32
+ */
+public class PureJavaCrc32 implements Checksum {
+
+  /** the current CRC value, bit-flipped */
+  private int crc;
+
+  public PureJavaCrc32() {
+    reset();
+  }
+
+  /** {@inheritDoc} */
+  public long getValue() {
+    return (~crc) & 0xffffffffL;
+  }
+
+  /** {@inheritDoc} */
+  public void reset() {
+    crc = 0xffffffff;
+  }
+
+  /** {@inheritDoc} */
+  public void update(byte[] b, int off, int len) {
+    int localCrc = crc;
+    while(len > 7) {
+      int c0 = b[off++] ^ localCrc;
+      int c1 = b[off++] ^ (localCrc >>>= 8);
+      int c2 = b[off++] ^ (localCrc >>>= 8);
+      int c3 = b[off++] ^ (localCrc >>>= 8);
+      localCrc = (T8_7[c0 & 0xff] ^ T8_6[c1 & 0xff])
+          ^ (T8_5[c2 & 0xff] ^ T8_4[c3 & 0xff]);
+
+      localCrc ^= (T8_3[b[off++] & 0xff] ^ T8_2[b[off++] & 0xff])
+           ^ (T8_1[b[off++] & 0xff] ^ T8_0[b[off++] & 0xff]);
+
+      len -= 8;
+    }
+    while(len > 0) {
+      localCrc = (localCrc >>> 8) ^ T8_0[(localCrc ^ b[off++]) & 0xff];
+      len--;
+    }
+    
+    // Publish crc out to object
+    crc = localCrc;
+  }
+
+  /** {@inheritDoc} */
+  final public void update(int b) {
+    crc = (crc >>> 8) ^ T8_0[(crc ^ b) & 0xff];
+  }
+
+  /*
+   * CRC-32 lookup tables generated by the polynomial 0xEDB88320.
+   * See also TestPureJavaCrc32.Table.
+   */
+  private static final int[] T8_0 = new int[] {
+    0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 
+    0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, 
+    0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 
+    0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 
+    0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 
+    0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, 
+    0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 
+    0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, 
+    0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 
+    0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 
+    0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 
+    0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, 
+    0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 
+    0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F, 
+    0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 
+    0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 
+    0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 
+    0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, 
+    0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 
+    0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, 
+    0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 
+    0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 
+    0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 
+    0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, 
+    0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 
+    0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, 
+    0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 
+    0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 
+    0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 
+    0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, 
+    0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 
+    0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, 
+    0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 
+    0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 
+    0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 
+    0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, 
+    0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 
+    0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, 
+    0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 
+    0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 
+    0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 
+    0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, 
+    0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 
+    0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, 
+    0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 
+    0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 
+    0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 
+    0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, 
+    0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 
+    0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, 
+    0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 
+    0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 
+    0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 
+    0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, 
+    0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 
+    0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, 
+    0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 
+    0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 
+    0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 
+    0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, 
+    0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 
+    0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, 
+    0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 
+    0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
+  };
+  private static final int[] T8_1 = new int[] {
+    0x00000000, 0x191B3141, 0x32366282, 0x2B2D53C3, 
+    0x646CC504, 0x7D77F445, 0x565AA786, 0x4F4196C7, 
+    0xC8D98A08, 0xD1C2BB49, 0xFAEFE88A, 0xE3F4D9CB, 
+    0xACB54F0C, 0xB5AE7E4D, 0x9E832D8E, 0x87981CCF, 
+    0x4AC21251, 0x53D92310, 0x78F470D3, 0x61EF4192, 
+    0x2EAED755, 0x37B5E614, 0x1C98B5D7, 0x05838496, 
+    0x821B9859, 0x9B00A918, 0xB02DFADB, 0xA936CB9A, 
+    0xE6775D5D, 0xFF6C6C1C, 0xD4413FDF, 0xCD5A0E9E, 
+    0x958424A2, 0x8C9F15E3, 0xA7B24620, 0xBEA97761, 
+    0xF1E8E1A6, 0xE8F3D0E7, 0xC3DE8324, 0xDAC5B265, 
+    0x5D5DAEAA, 0x44469FEB, 0x6F6BCC28, 0x7670FD69, 
+    0x39316BAE, 0x202A5AEF, 0x0B07092C, 0x121C386D, 
+    0xDF4636F3, 0xC65D07B2, 0xED705471, 0xF46B6530, 
+    0xBB2AF3F7, 0xA231C2B6, 0x891C9175, 0x9007A034, 
+    0x179FBCFB, 0x0E848DBA, 0x25A9DE79, 0x3CB2EF38, 
+    0x73F379FF, 0x6AE848BE, 0x41C51B7D, 0x58DE2A3C, 
+    0xF0794F05, 0xE9627E44, 0xC24F2D87, 0xDB541CC6, 
+    0x94158A01, 0x8D0EBB40, 0xA623E883, 0xBF38D9C2, 
+    0x38A0C50D, 0x21BBF44C, 0x0A96A78F, 0x138D96CE, 
+    0x5CCC0009, 0x45D73148, 0x6EFA628B, 0x77E153CA, 
+    0xBABB5D54, 0xA3A06C15, 0x888D3FD6, 0x91960E97, 
+    0xDED79850, 0xC7CCA911, 0xECE1FAD2, 0xF5FACB93, 
+    0x7262D75C, 0x6B79E61D, 0x4054B5DE, 0x594F849F, 
+    0x160E1258, 0x0F152319, 0x243870DA, 0x3D23419B, 
+    0x65FD6BA7, 0x7CE65AE6, 0x57CB0925, 0x4ED03864, 
+    0x0191AEA3, 0x188A9FE2, 0x33A7CC21, 0x2ABCFD60, 
+    0xAD24E1AF, 0xB43FD0EE, 0x9F12832D, 0x8609B26C, 
+    0xC94824AB, 0xD05315EA, 0xFB7E4629, 0xE2657768, 
+    0x2F3F79F6, 0x362448B7, 0x1D091B74, 0x04122A35, 
+    0x4B53BCF2, 0x52488DB3, 0x7965DE70, 0x607EEF31, 
+    0xE7E6F3FE, 0xFEFDC2BF, 0xD5D0917C, 0xCCCBA03D, 
+    0x838A36FA, 0x9A9107BB, 0xB1BC5478, 0xA8A76539, 
+    0x3B83984B, 0x2298A90A, 0x09B5FAC9, 0x10AECB88, 
+    0x5FEF5D4F, 0x46F46C0E, 0x6DD93FCD, 0x74C20E8C, 
+    0xF35A1243, 0xEA412302, 0xC16C70C1, 0xD8774180, 
+    0x9736D747, 0x8E2DE606, 0xA500B5C5, 0xBC1B8484, 
+    0x71418A1A, 0x685ABB5B, 0x4377E898, 0x5A6CD9D9, 
+    0x152D4F1E, 0x0C367E5F, 0x271B2D9C, 0x3E001CDD, 
+    0xB9980012, 0xA0833153, 0x8BAE6290, 0x92B553D1, 
+    0xDDF4C516, 0xC4EFF457, 0xEFC2A794, 0xF6D996D5, 
+    0xAE07BCE9, 0xB71C8DA8, 0x9C31DE6B, 0x852AEF2A, 
+    0xCA6B79ED, 0xD37048AC, 0xF85D1B6F, 0xE1462A2E, 
+    0x66DE36E1, 0x7FC507A0, 0x54E85463, 0x4DF36522, 
+    0x02B2F3E5, 0x1BA9C2A4, 0x30849167, 0x299FA026, 
+    0xE4C5AEB8, 0xFDDE9FF9, 0xD6F3CC3A, 0xCFE8FD7B, 
+    0x80A96BBC, 0x99B25AFD, 0xB29F093E, 0xAB84387F, 
+    0x2C1C24B0, 0x350715F1, 0x1E2A4632, 0x07317773, 
+    0x4870E1B4, 0x516BD0F5, 0x7A468336, 0x635DB277, 
+    0xCBFAD74E, 0xD2E1E60F, 0xF9CCB5CC, 0xE0D7848D, 
+    0xAF96124A, 0xB68D230B, 0x9DA070C8, 0x84BB4189, 
+    0x03235D46, 0x1A386C07, 0x31153FC4, 0x280E0E85, 
+    0x674F9842, 0x7E54A903, 0x5579FAC0, 0x4C62CB81, 
+    0x8138C51F, 0x9823F45E, 0xB30EA79D, 0xAA1596DC, 
+    0xE554001B, 0xFC4F315A, 0xD7626299, 0xCE7953D8, 
+    0x49E14F17, 0x50FA7E56, 0x7BD72D95, 0x62CC1CD4, 
+    0x2D8D8A13, 0x3496BB52, 0x1FBBE891, 0x06A0D9D0, 
+    0x5E7EF3EC, 0x4765C2AD, 0x6C48916E, 0x7553A02F, 
+    0x3A1236E8, 0x230907A9, 0x0824546A, 0x113F652B, 
+    0x96A779E4, 0x8FBC48A5, 0xA4911B66, 0xBD8A2A27, 
+    0xF2CBBCE0, 0xEBD08DA1, 0xC0FDDE62, 0xD9E6EF23, 
+    0x14BCE1BD, 0x0DA7D0FC, 0x268A833F, 0x3F91B27E, 
+    0x70D024B9, 0x69CB15F8, 0x42E6463B, 0x5BFD777A, 
+    0xDC656BB5, 0xC57E5AF4, 0xEE530937, 0xF7483876, 
+    0xB809AEB1, 0xA1129FF0, 0x8A3FCC33, 0x9324FD72
+  };
+  private static final int[] T8_2 = new int[] {
+    0x00000000, 0x01C26A37, 0x0384D46E, 0x0246BE59, 
+    0x0709A8DC, 0x06CBC2EB, 0x048D7CB2, 0x054F1685, 
+    0x0E1351B8, 0x0FD13B8F, 0x0D9785D6, 0x0C55EFE1, 
+    0x091AF964, 0x08D89353, 0x0A9E2D0A, 0x0B5C473D, 
+    0x1C26A370, 0x1DE4C947, 0x1FA2771E, 0x1E601D29, 
+    0x1B2F0BAC, 0x1AED619B, 0x18ABDFC2, 0x1969B5F5, 
+    0x1235F2C8, 0x13F798FF, 0x11B126A6, 0x10734C91, 
+    0x153C5A14, 0x14FE3023, 0x16B88E7A, 0x177AE44D, 
+    0x384D46E0, 0x398F2CD7, 0x3BC9928E, 0x3A0BF8B9, 
+    0x3F44EE3C, 0x3E86840B, 0x3CC03A52, 0x3D025065, 
+    0x365E1758, 0x379C7D6F, 0x35DAC336, 0x3418A901, 
+    0x3157BF84, 0x3095D5B3, 0x32D36BEA, 0x331101DD, 
+    0x246BE590, 0x25A98FA7, 0x27EF31FE, 0x262D5BC9, 
+    0x23624D4C, 0x22A0277B, 0x20E69922, 0x2124F315, 
+    0x2A78B428, 0x2BBADE1F, 0x29FC6046, 0x283E0A71, 
+    0x2D711CF4, 0x2CB376C3, 0x2EF5C89A, 0x2F37A2AD, 
+    0x709A8DC0, 0x7158E7F7, 0x731E59AE, 0x72DC3399, 
+    0x7793251C, 0x76514F2B, 0x7417F172, 0x75D59B45, 
+    0x7E89DC78, 0x7F4BB64F, 0x7D0D0816, 0x7CCF6221, 
+    0x798074A4, 0x78421E93, 0x7A04A0CA, 0x7BC6CAFD, 
+    0x6CBC2EB0, 0x6D7E4487, 0x6F38FADE, 0x6EFA90E9, 
+    0x6BB5866C, 0x6A77EC5B, 0x68315202, 0x69F33835, 
+    0x62AF7F08, 0x636D153F, 0x612BAB66, 0x60E9C151, 
+    0x65A6D7D4, 0x6464BDE3, 0x662203BA, 0x67E0698D, 
+    0x48D7CB20, 0x4915A117, 0x4B531F4E, 0x4A917579, 
+    0x4FDE63FC, 0x4E1C09CB, 0x4C5AB792, 0x4D98DDA5, 
+    0x46C49A98, 0x4706F0AF, 0x45404EF6, 0x448224C1, 
+    0x41CD3244, 0x400F5873, 0x4249E62A, 0x438B8C1D, 
+    0x54F16850, 0x55330267, 0x5775BC3E, 0x56B7D609, 
+    0x53F8C08C, 0x523AAABB, 0x507C14E2, 0x51BE7ED5, 
+    0x5AE239E8, 0x5B2053DF, 0x5966ED86, 0x58A487B1, 
+    0x5DEB9134, 0x5C29FB03, 0x5E6F455A, 0x5FAD2F6D, 
+    0xE1351B80, 0xE0F771B7, 0xE2B1CFEE, 0xE373A5D9, 
+    0xE63CB35C, 0xE7FED96B, 0xE5B86732, 0xE47A0D05, 
+    0xEF264A38, 0xEEE4200F, 0xECA29E56, 0xED60F461, 
+    0xE82FE2E4, 0xE9ED88D3, 0xEBAB368A, 0xEA695CBD, 
+    0xFD13B8F0, 0xFCD1D2C7, 0xFE976C9E, 0xFF5506A9, 
+    0xFA1A102C, 0xFBD87A1B, 0xF99EC442, 0xF85CAE75, 
+    0xF300E948, 0xF2C2837F, 0xF0843D26, 0xF1465711, 
+    0xF4094194, 0xF5CB2BA3, 0xF78D95FA, 0xF64FFFCD, 
+    0xD9785D60, 0xD8BA3757, 0xDAFC890E, 0xDB3EE339, 
+    0xDE71F5BC, 0xDFB39F8B, 0xDDF521D2, 0xDC374BE5, 
+    0xD76B0CD8, 0xD6A966EF, 0xD4EFD8B6, 0xD52DB281, 
+    0xD062A404, 0xD1A0CE33, 0xD3E6706A, 0xD2241A5D, 
+    0xC55EFE10, 0xC49C9427, 0xC6DA2A7E, 0xC7184049, 
+    0xC25756CC, 0xC3953CFB, 0xC1D382A2, 0xC011E895, 
+    0xCB4DAFA8, 0xCA8FC59F, 0xC8C97BC6, 0xC90B11F1, 
+    0xCC440774, 0xCD866D43, 0xCFC0D31A, 0xCE02B92D, 
+    0x91AF9640, 0x906DFC77, 0x922B422E, 0x93E92819, 
+    0x96A63E9C, 0x976454AB, 0x9522EAF2, 0x94E080C5, 
+    0x9FBCC7F8, 0x9E7EADCF, 0x9C381396, 0x9DFA79A1, 
+    0x98B56F24, 0x99770513, 0x9B31BB4A, 0x9AF3D17D, 
+    0x8D893530, 0x8C4B5F07, 0x8E0DE15E, 0x8FCF8B69, 
+    0x8A809DEC, 0x8B42F7DB, 0x89044982, 0x88C623B5, 
+    0x839A6488, 0x82580EBF, 0x801EB0E6, 0x81DCDAD1, 
+    0x8493CC54, 0x8551A663, 0x8717183A, 0x86D5720D, 
+    0xA9E2D0A0, 0xA820BA97, 0xAA6604CE, 0xABA46EF9, 
+    0xAEEB787C, 0xAF29124B, 0xAD6FAC12, 0xACADC625, 
+    0xA7F18118, 0xA633EB2F, 0xA4755576, 0xA5B73F41, 
+    0xA0F829C4, 0xA13A43F3, 0xA37CFDAA, 0xA2BE979D, 
+    0xB5C473D0, 0xB40619E7, 0xB640A7BE, 0xB782CD89, 
+    0xB2CDDB0C, 0xB30FB13B, 0xB1490F62, 0xB08B6555, 
+    0xBBD72268, 0xBA15485F, 0xB853F606, 0xB9919C31, 
+    0xBCDE8AB4, 0xBD1CE083, 0xBF5A5EDA, 0xBE9834ED
+  };
+  private static final int[] T8_3 = new int[] {
+    0x00000000, 0xB8BC6765, 0xAA09C88B, 0x12B5AFEE, 
+    0x8F629757, 0x37DEF032, 0x256B5FDC, 0x9DD738B9, 
+    0xC5B428EF, 0x7D084F8A, 0x6FBDE064, 0xD7018701, 
+    0x4AD6BFB8, 0xF26AD8DD, 0xE0DF7733, 0x58631056, 
+    0x5019579F, 0xE8A530FA, 0xFA109F14, 0x42ACF871, 
+    0xDF7BC0C8, 0x67C7A7AD, 0x75720843, 0xCDCE6F26, 
+    0x95AD7F70, 0x2D111815, 0x3FA4B7FB, 0x8718D09E, 
+    0x1ACFE827, 0xA2738F42, 0xB0C620AC, 0x087A47C9, 
+    0xA032AF3E, 0x188EC85B, 0x0A3B67B5, 0xB28700D0, 
+    0x2F503869, 0x97EC5F0C, 0x8559F0E2, 0x3DE59787, 
+    0x658687D1, 0xDD3AE0B4, 0xCF8F4F5A, 0x7733283F, 
+    0xEAE41086, 0x525877E3, 0x40EDD80D, 0xF851BF68, 
+    0xF02BF8A1, 0x48979FC4, 0x5A22302A, 0xE29E574F, 
+    0x7F496FF6, 0xC7F50893, 0xD540A77D, 0x6DFCC018, 
+    0x359FD04E, 0x8D23B72B, 0x9F9618C5, 0x272A7FA0, 
+    0xBAFD4719, 0x0241207C, 0x10F48F92, 0xA848E8F7, 
+    0x9B14583D, 0x23A83F58, 0x311D90B6, 0x89A1F7D3, 
+    0x1476CF6A, 0xACCAA80F, 0xBE7F07E1, 0x06C36084, 
+    0x5EA070D2, 0xE61C17B7, 0xF4A9B859, 0x4C15DF3C, 
+    0xD1C2E785, 0x697E80E0, 0x7BCB2F0E, 0xC377486B, 
+    0xCB0D0FA2, 0x73B168C7, 0x6104C729, 0xD9B8A04C, 
+    0x446F98F5, 0xFCD3FF90, 0xEE66507E, 0x56DA371B, 
+    0x0EB9274D, 0xB6054028, 0xA4B0EFC6, 0x1C0C88A3, 
+    0x81DBB01A, 0x3967D77F, 0x2BD27891, 0x936E1FF4, 
+    0x3B26F703, 0x839A9066, 0x912F3F88, 0x299358ED, 
+    0xB4446054, 0x0CF80731, 0x1E4DA8DF, 0xA6F1CFBA, 
+    0xFE92DFEC, 0x462EB889, 0x549B1767, 0xEC277002, 
+    0x71F048BB, 0xC94C2FDE, 0xDBF98030, 0x6345E755, 
+    0x6B3FA09C, 0xD383C7F9, 0xC1366817, 0x798A0F72, 
+    0xE45D37CB, 0x5CE150AE, 0x4E54FF40, 0xF6E89825, 
+    0xAE8B8873, 0x1637EF16, 0x048240F8, 0xBC3E279D, 
+    0x21E91F24, 0x99557841, 0x8BE0D7AF, 0x335CB0CA, 
+    0xED59B63B, 0x55E5D15E, 0x47507EB0, 0xFFEC19D5, 
+    0x623B216C, 0xDA874609, 0xC832E9E7, 0x708E8E82, 
+    0x28ED9ED4, 0x9051F9B1, 0x82E4565F, 0x3A58313A, 
+    0xA78F0983, 0x1F336EE6, 0x0D86C108, 0xB53AA66D, 
+    0xBD40E1A4, 0x05FC86C1, 0x1749292F, 0xAFF54E4A, 
+    0x322276F3, 0x8A9E1196, 0x982BBE78, 0x2097D91D, 
+    0x78F4C94B, 0xC048AE2E, 0xD2FD01C0, 0x6A4166A5, 
+    0xF7965E1C, 0x4F2A3979, 0x5D9F9697, 0xE523F1F2, 
+    0x4D6B1905, 0xF5D77E60, 0xE762D18E, 0x5FDEB6EB, 
+    0xC2098E52, 0x7AB5E937, 0x680046D9, 0xD0BC21BC, 
+    0x88DF31EA, 0x3063568F, 0x22D6F961, 0x9A6A9E04, 
+    0x07BDA6BD, 0xBF01C1D8, 0xADB46E36, 0x15080953, 
+    0x1D724E9A, 0xA5CE29FF, 0xB77B8611, 0x0FC7E174, 
+    0x9210D9CD, 0x2AACBEA8, 0x38191146, 0x80A57623, 
+    0xD8C66675, 0x607A0110, 0x72CFAEFE, 0xCA73C99B, 
+    0x57A4F122, 0xEF189647, 0xFDAD39A9, 0x45115ECC, 
+    0x764DEE06, 0xCEF18963, 0xDC44268D, 0x64F841E8, 
+    0xF92F7951, 0x41931E34, 0x5326B1DA, 0xEB9AD6BF, 
+    0xB3F9C6E9, 0x0B45A18C, 0x19F00E62, 0xA14C6907, 
+    0x3C9B51BE, 0x842736DB, 0x96929935, 0x2E2EFE50, 
+    0x2654B999, 0x9EE8DEFC, 0x8C5D7112, 0x34E11677, 
+    0xA9362ECE, 0x118A49AB, 0x033FE645, 0xBB838120, 
+    0xE3E09176, 0x5B5CF613, 0x49E959FD, 0xF1553E98, 
+    0x6C820621, 0xD43E6144, 0xC68BCEAA, 0x7E37A9CF, 
+    0xD67F4138, 0x6EC3265D, 0x7C7689B3, 0xC4CAEED6, 
+    0x591DD66F, 0xE1A1B10A, 0xF3141EE4, 0x4BA87981, 
+    0x13CB69D7, 0xAB770EB2, 0xB9C2A15C, 0x017EC639, 
+    0x9CA9FE80, 0x241599E5, 0x36A0360B, 0x8E1C516E, 
+    0x866616A7, 0x3EDA71C2, 0x2C6FDE2C, 0x94D3B949, 
+    0x090481F0, 0xB1B8E695, 0xA30D497B, 0x1BB12E1E, 
+    0x43D23E48, 0xFB6E592D, 0xE9DBF6C3, 0x516791A6, 
+    0xCCB0A91F, 0x740CCE7A, 0x66B96194, 0xDE0506F1
+  };
+  private static final int[] T8_4 = new int[] {
+    0x00000000, 0x3D6029B0, 0x7AC05360, 0x47A07AD0, 
+    0xF580A6C0, 0xC8E08F70, 0x8F40F5A0, 0xB220DC10, 
+    0x30704BC1, 0x0D106271, 0x4AB018A1, 0x77D03111, 
+    0xC5F0ED01, 0xF890C4B1, 0xBF30BE61, 0x825097D1, 
+    0x60E09782, 0x5D80BE32, 0x1A20C4E2, 0x2740ED52, 
+    0x95603142, 0xA80018F2, 0xEFA06222, 0xD2C04B92, 
+    0x5090DC43, 0x6DF0F5F3, 0x2A508F23, 0x1730A693, 
+    0xA5107A83, 0x98705333, 0xDFD029E3, 0xE2B00053, 
+    0xC1C12F04, 0xFCA106B4, 0xBB017C64, 0x866155D4, 
+    0x344189C4, 0x0921A074, 0x4E81DAA4, 0x73E1F314, 
+    0xF1B164C5, 0xCCD14D75, 0x8B7137A5, 0xB6111E15, 
+    0x0431C205, 0x3951EBB5, 0x7EF19165, 0x4391B8D5, 
+    0xA121B886, 0x9C419136, 0xDBE1EBE6, 0xE681C256, 
+    0x54A11E46, 0x69C137F6, 0x2E614D26, 0x13016496, 
+    0x9151F347, 0xAC31DAF7, 0xEB91A027, 0xD6F18997, 
+    0x64D15587, 0x59B17C37, 0x1E1106E7, 0x23712F57, 
+    0x58F35849, 0x659371F9, 0x22330B29, 0x1F532299, 
+    0xAD73FE89, 0x9013D739, 0xD7B3ADE9, 0xEAD38459, 
+    0x68831388, 0x55E33A38, 0x124340E8, 0x2F236958, 
+    0x9D03B548, 0xA0639CF8, 0xE7C3E628, 0xDAA3CF98, 
+    0x3813CFCB, 0x0573E67B, 0x42D39CAB, 0x7FB3B51B, 
+    0xCD93690B, 0xF0F340BB, 0xB7533A6B, 0x8A3313DB, 
+    0x0863840A, 0x3503ADBA, 0x72A3D76A, 0x4FC3FEDA, 
+    0xFDE322CA, 0xC0830B7A, 0x872371AA, 0xBA43581A, 
+    0x9932774D, 0xA4525EFD, 0xE3F2242D, 0xDE920D9D, 
+    0x6CB2D18D, 0x51D2F83D, 0x167282ED, 0x2B12AB5D, 
+    0xA9423C8C, 0x9422153C, 0xD3826FEC, 0xEEE2465C, 
+    0x5CC29A4C, 0x61A2B3FC, 0x2602C92C, 0x1B62E09C, 
+    0xF9D2E0CF, 0xC4B2C97F, 0x8312B3AF, 0xBE729A1F, 
+    0x0C52460F, 0x31326FBF, 0x7692156F, 0x4BF23CDF, 
+    0xC9A2AB0E, 0xF4C282BE, 0xB362F86E, 0x8E02D1DE, 
+    0x3C220DCE, 0x0142247E, 0x46E25EAE, 0x7B82771E, 
+    0xB1E6B092, 0x8C869922, 0xCB26E3F2, 0xF646CA42, 
+    0x44661652, 0x79063FE2, 0x3EA64532, 0x03C66C82, 
+    0x8196FB53, 0xBCF6D2E3, 0xFB56A833, 0xC6368183, 
+    0x74165D93, 0x49767423, 0x0ED60EF3, 0x33B62743, 
+    0xD1062710, 0xEC660EA0, 0xABC67470, 0x96A65DC0, 
+    0x248681D0, 0x19E6A860, 0x5E46D2B0, 0x6326FB00, 
+    0xE1766CD1, 0xDC164561, 0x9BB63FB1, 0xA6D61601, 
+    0x14F6CA11, 0x2996E3A1, 0x6E369971, 0x5356B0C1, 
+    0x70279F96, 0x4D47B626, 0x0AE7CCF6, 0x3787E546, 
+    0x85A73956, 0xB8C710E6, 0xFF676A36, 0xC2074386, 
+    0x4057D457, 0x7D37FDE7, 0x3A978737, 0x07F7AE87, 
+    0xB5D77297, 0x88B75B27, 0xCF1721F7, 0xF2770847, 
+    0x10C70814, 0x2DA721A4, 0x6A075B74, 0x576772C4, 
+    0xE547AED4, 0xD8278764, 0x9F87FDB4, 0xA2E7D404, 
+    0x20B743D5, 0x1DD76A65, 0x5A7710B5, 0x67173905, 
+    0xD537E515, 0xE857CCA5, 0xAFF7B675, 0x92979FC5, 
+    0xE915E8DB, 0xD475C16B, 0x93D5BBBB, 0xAEB5920B, 
+    0x1C954E1B, 0x21F567AB, 0x66551D7B, 0x5B3534CB, 
+    0xD965A31A, 0xE4058AAA, 0xA3A5F07A, 0x9EC5D9CA, 
+    0x2CE505DA, 0x11852C6A, 0x562556BA, 0x6B457F0A, 
+    0x89F57F59, 0xB49556E9, 0xF3352C39, 0xCE550589, 
+    0x7C75D999, 0x4115F029, 0x06B58AF9, 0x3BD5A349, 
+    0xB9853498, 0x84E51D28, 0xC34567F8, 0xFE254E48, 
+    0x4C059258, 0x7165BBE8, 0x36C5C138, 0x0BA5E888, 
+    0x28D4C7DF, 0x15B4EE6F, 0x521494BF, 0x6F74BD0F, 
+    0xDD54611F, 0xE03448AF, 0xA794327F, 0x9AF41BCF, 
+    0x18A48C1E, 0x25C4A5AE, 0x6264DF7E, 0x5F04F6CE, 
+    0xED242ADE, 0xD044036E, 0x97E479BE, 0xAA84500E, 
+    0x4834505D, 0x755479ED, 0x32F4033D, 0x0F942A8D, 
+    0xBDB4F69D, 0x80D4DF2D, 0xC774A5FD, 0xFA148C4D, 
+    0x78441B9C, 0x4524322C, 0x028448FC, 0x3FE4614C, 
+    0x8DC4BD5C, 0xB0A494EC, 0xF704EE3C, 0xCA64C78C
+  };
+  private static final int[] T8_5 = new int[] {
+    0x00000000, 0xCB5CD3A5, 0x4DC8A10B, 0x869472AE, 
+    0x9B914216, 0x50CD91B3, 0xD659E31D, 0x1D0530B8, 
+    0xEC53826D, 0x270F51C8, 0xA19B2366, 0x6AC7F0C3, 
+    0x77C2C07B, 0xBC9E13DE, 0x3A0A6170, 0xF156B2D5, 
+    0x03D6029B, 0xC88AD13E, 0x4E1EA390, 0x85427035, 
+    0x9847408D, 0x531B9328, 0xD58FE186, 0x1ED33223, 
+    0xEF8580F6, 0x24D95353, 0xA24D21FD, 0x6911F258, 
+    0x7414C2E0, 0xBF481145, 0x39DC63EB, 0xF280B04E, 
+    0x07AC0536, 0xCCF0D693, 0x4A64A43D, 0x81387798, 
+    0x9C3D4720, 0x57619485, 0xD1F5E62B, 0x1AA9358E, 
+    0xEBFF875B, 0x20A354FE, 0xA6372650, 0x6D6BF5F5, 
+    0x706EC54D, 0xBB3216E8, 0x3DA66446, 0xF6FAB7E3, 
+    0x047A07AD, 0xCF26D408, 0x49B2A6A6, 0x82EE7503, 
+    0x9FEB45BB, 0x54B7961E, 0xD223E4B0, 0x197F3715, 
+    0xE82985C0, 0x23755665, 0xA5E124CB, 0x6EBDF76E, 
+    0x73B8C7D6, 0xB8E41473, 0x3E7066DD, 0xF52CB578, 
+    0x0F580A6C, 0xC404D9C9, 0x4290AB67, 0x89CC78C2, 
+    0x94C9487A, 0x5F959BDF, 0xD901E971, 0x125D3AD4, 
+    0xE30B8801, 0x28575BA4, 0xAEC3290A, 0x659FFAAF, 
+    0x789ACA17, 0xB3C619B2, 0x35526B1C, 0xFE0EB8B9, 
+    0x0C8E08F7, 0xC7D2DB52, 0x4146A9FC, 0x8A1A7A59, 
+    0x971F4AE1, 0x5C439944, 0xDAD7EBEA, 0x118B384F, 
+    0xE0DD8A9A, 0x2B81593F, 0xAD152B91, 0x6649F834, 
+    0x7B4CC88C, 0xB0101B29, 0x36846987, 0xFDD8BA22, 
+    0x08F40F5A, 0xC3A8DCFF, 0x453CAE51, 0x8E607DF4, 
+    0x93654D4C, 0x58399EE9, 0xDEADEC47, 0x15F13FE2, 
+    0xE4A78D37, 0x2FFB5E92, 0xA96F2C3C, 0x6233FF99, 
+    0x7F36CF21, 0xB46A1C84, 0x32FE6E2A, 0xF9A2BD8F, 
+    0x0B220DC1, 0xC07EDE64, 0x46EAACCA, 0x8DB67F6F, 
+    0x90B34FD7, 0x5BEF9C72, 0xDD7BEEDC, 0x16273D79, 
+    0xE7718FAC, 0x2C2D5C09, 0xAAB92EA7, 0x61E5FD02, 
+    0x7CE0CDBA, 0xB7BC1E1F, 0x31286CB1, 0xFA74BF14, 
+    0x1EB014D8, 0xD5ECC77D, 0x5378B5D3, 0x98246676, 
+    0x852156CE, 0x4E7D856B, 0xC8E9F7C5, 0x03B52460, 
+    0xF2E396B5, 0x39BF4510, 0xBF2B37BE, 0x7477E41B, 
+    0x6972D4A3, 0xA22E0706, 0x24BA75A8, 0xEFE6A60D, 
+    0x1D661643, 0xD63AC5E6, 0x50AEB748, 0x9BF264ED, 
+    0x86F75455, 0x4DAB87F0, 0xCB3FF55E, 0x006326FB, 
+    0xF135942E, 0x3A69478B, 0xBCFD3525, 0x77A1E680, 
+    0x6AA4D638, 0xA1F8059D, 0x276C7733, 0xEC30A496, 
+    0x191C11EE, 0xD240C24B, 0x54D4B0E5, 0x9F886340, 
+    0x828D53F8, 0x49D1805D, 0xCF45F2F3, 0x04192156, 
+    0xF54F9383, 0x3E134026, 0xB8873288, 0x73DBE12D, 
+    0x6EDED195, 0xA5820230, 0x2316709E, 0xE84AA33B, 
+    0x1ACA1375, 0xD196C0D0, 0x5702B27E, 0x9C5E61DB, 
+    0x815B5163, 0x4A0782C6, 0xCC93F068, 0x07CF23CD, 
+    0xF6999118, 0x3DC542BD, 0xBB513013, 0x700DE3B6, 
+    0x6D08D30E, 0xA65400AB, 0x20C07205, 0xEB9CA1A0, 
+    0x11E81EB4, 0xDAB4CD11, 0x5C20BFBF, 0x977C6C1A, 
+    0x8A795CA2, 0x41258F07, 0xC7B1FDA9, 0x0CED2E0C, 
+    0xFDBB9CD9, 0x36E74F7C, 0xB0733DD2, 0x7B2FEE77, 
+    0x662ADECF, 0xAD760D6A, 0x2BE27FC4, 0xE0BEAC61, 
+    0x123E1C2F, 0xD962CF8A, 0x5FF6BD24, 0x94AA6E81, 
+    0x89AF5E39, 0x42F38D9C, 0xC467FF32, 0x0F3B2C97, 
+    0xFE6D9E42, 0x35314DE7, 0xB3A53F49, 0x78F9ECEC, 
+    0x65FCDC54, 0xAEA00FF1, 0x28347D5F, 0xE368AEFA, 
+    0x16441B82, 0xDD18C827, 0x5B8CBA89, 0x90D0692C, 
+    0x8DD55994, 0x46898A31, 0xC01DF89F, 0x0B412B3A, 
+    0xFA1799EF, 0x314B4A4A, 0xB7DF38E4, 0x7C83EB41, 
+    0x6186DBF9, 0xAADA085C, 0x2C4E7AF2, 0xE712A957, 
+    0x15921919, 0xDECECABC, 0x585AB812, 0x93066BB7, 
+    0x8E035B0F, 0x455F88AA, 0xC3CBFA04, 0x089729A1, 
+    0xF9C19B74, 0x329D48D1, 0xB4093A7F, 0x7F55E9DA, 
+    0x6250D962, 0xA90C0AC7, 0x2F987869, 0xE4C4ABCC
+  };
+  private static final int[] T8_6 = new int[] {
+    0x00000000, 0xA6770BB4, 0x979F1129, 0x31E81A9D, 
+    0xF44F2413, 0x52382FA7, 0x63D0353A, 0xC5A73E8E, 
+    0x33EF4E67, 0x959845D3, 0xA4705F4E, 0x020754FA, 
+    0xC7A06A74, 0x61D761C0, 0x503F7B5D, 0xF64870E9, 
+    0x67DE9CCE, 0xC1A9977A, 0xF0418DE7, 0x56368653, 
+    0x9391B8DD, 0x35E6B369, 0x040EA9F4, 0xA279A240, 
+    0x5431D2A9, 0xF246D91D, 0xC3AEC380, 0x65D9C834, 
+    0xA07EF6BA, 0x0609FD0E, 0x37E1E793, 0x9196EC27, 
+    0xCFBD399C, 0x69CA3228, 0x582228B5, 0xFE552301, 
+    0x3BF21D8F, 0x9D85163B, 0xAC6D0CA6, 0x0A1A0712, 
+    0xFC5277FB, 0x5A257C4F, 0x6BCD66D2, 0xCDBA6D66, 
+    0x081D53E8, 0xAE6A585C, 0x9F8242C1, 0x39F54975, 
+    0xA863A552, 0x0E14AEE6, 0x3FFCB47B, 0x998BBFCF, 
+    0x5C2C8141, 0xFA5B8AF5, 0xCBB39068, 0x6DC49BDC, 
+    0x9B8CEB35, 0x3DFBE081, 0x0C13FA1C, 0xAA64F1A8, 
+    0x6FC3CF26, 0xC9B4C492, 0xF85CDE0F, 0x5E2BD5BB, 
+    0x440B7579, 0xE27C7ECD, 0xD3946450, 0x75E36FE4, 
+    0xB044516A, 0x16335ADE, 0x27DB4043, 0x81AC4BF7, 
+    0x77E43B1E, 0xD19330AA, 0xE07B2A37, 0x460C2183, 
+    0x83AB1F0D, 0x25DC14B9, 0x14340E24, 0xB2430590, 
+    0x23D5E9B7, 0x85A2E203, 0xB44AF89E, 0x123DF32A, 
+    0xD79ACDA4, 0x71EDC610, 0x4005DC8D, 0xE672D739, 
+    0x103AA7D0, 0xB64DAC64, 0x87A5B6F9, 0x21D2BD4D, 
+    0xE47583C3, 0x42028877, 0x73EA92EA, 0xD59D995E, 
+    0x8BB64CE5, 0x2DC14751, 0x1C295DCC, 0xBA5E5678, 
+    0x7FF968F6, 0xD98E6342, 0xE86679DF, 0x4E11726B, 
+    0xB8590282, 0x1E2E0936, 0x2FC613AB, 0x89B1181F, 
+    0x4C162691, 0xEA612D25, 0xDB8937B8, 0x7DFE3C0C, 
+    0xEC68D02B, 0x4A1FDB9F, 0x7BF7C102, 0xDD80CAB6, 
+    0x1827F438, 0xBE50FF8C, 0x8FB8E511, 0x29CFEEA5, 
+    0xDF879E4C, 0x79F095F8, 0x48188F65, 0xEE6F84D1, 
+    0x2BC8BA5F, 0x8DBFB1EB, 0xBC57AB76, 0x1A20A0C2, 
+    0x8816EAF2, 0x2E61E146, 0x1F89FBDB, 0xB9FEF06F, 
+    0x7C59CEE1, 0xDA2EC555, 0xEBC6DFC8, 0x4DB1D47C, 
+    0xBBF9A495, 0x1D8EAF21, 0x2C66B5BC, 0x8A11BE08, 
+    0x4FB68086, 0xE9C18B32, 0xD82991AF, 0x7E5E9A1B, 
+    0xEFC8763C, 0x49BF7D88, 0x78576715, 0xDE206CA1, 
+    0x1B87522F, 0xBDF0599B, 0x8C184306, 0x2A6F48B2, 
+    0xDC27385B, 0x7A5033EF, 0x4BB82972, 0xEDCF22C6, 
+    0x28681C48, 0x8E1F17FC, 0xBFF70D61, 0x198006D5, 
+    0x47ABD36E, 0xE1DCD8DA, 0xD034C247, 0x7643C9F3, 
+    0xB3E4F77D, 0x1593FCC9, 0x247BE654, 0x820CEDE0, 
+    0x74449D09, 0xD23396BD, 0xE3DB8C20, 0x45AC8794, 
+    0x800BB91A, 0x267CB2AE, 0x1794A833, 0xB1E3A387, 
+    0x20754FA0, 0x86024414, 0xB7EA5E89, 0x119D553D, 
+    0xD43A6BB3, 0x724D6007, 0x43A57A9A, 0xE5D2712E, 
+    0x139A01C7, 0xB5ED0A73, 0x840510EE, 0x22721B5A, 
+    0xE7D525D4, 0x41A22E60, 0x704A34FD, 0xD63D3F49, 
+    0xCC1D9F8B, 0x6A6A943F, 0x5B828EA2, 0xFDF58516, 
+    0x3852BB98, 0x9E25B02C, 0xAFCDAAB1, 0x09BAA105, 
+    0xFFF2D1EC, 0x5985DA58, 0x686DC0C5, 0xCE1ACB71, 
+    0x0BBDF5FF, 0xADCAFE4B, 0x9C22E4D6, 0x3A55EF62, 
+    0xABC30345, 0x0DB408F1, 0x3C5C126C, 0x9A2B19D8, 
+    0x5F8C2756, 0xF9FB2CE2, 0xC813367F, 0x6E643DCB, 
+    0x982C4D22, 0x3E5B4696, 0x0FB35C0B, 0xA9C457BF, 
+    0x6C636931, 0xCA146285, 0xFBFC7818, 0x5D8B73AC, 
+    0x03A0A617, 0xA5D7ADA3, 0x943FB73E, 0x3248BC8A, 
+    0xF7EF8204, 0x519889B0, 0x6070932D, 0xC6079899, 
+    0x304FE870, 0x9638E3C4, 0xA7D0F959, 0x01A7F2ED, 
+    0xC400CC63, 0x6277C7D7, 0x539FDD4A, 0xF5E8D6FE, 
+    0x647E3AD9, 0xC209316D, 0xF3E12BF0, 0x55962044, 
+    0x90311ECA, 0x3646157E, 0x07AE0FE3, 0xA1D90457, 
+    0x579174BE, 0xF1E67F0A, 0xC00E6597, 0x66796E23, 
+    0xA3DE50AD, 0x05A95B19, 0x34414184, 0x92364A30
+  };
+  private static final int[] T8_7 = new int[] {
+    0x00000000, 0xCCAA009E, 0x4225077D, 0x8E8F07E3, 
+    0x844A0EFA, 0x48E00E64, 0xC66F0987, 0x0AC50919, 
+    0xD3E51BB5, 0x1F4F1B2B, 0x91C01CC8, 0x5D6A1C56, 
+    0x57AF154F, 0x9B0515D1, 0x158A1232, 0xD92012AC, 
+    0x7CBB312B, 0xB01131B5, 0x3E9E3656, 0xF23436C8, 
+    0xF8F13FD1, 0x345B3F4F, 0xBAD438AC, 0x767E3832, 
+    0xAF5E2A9E, 0x63F42A00, 0xED7B2DE3, 0x21D12D7D, 
+    0x2B142464, 0xE7BE24FA, 0x69312319, 0xA59B2387, 
+    0xF9766256, 0x35DC62C8, 0xBB53652B, 0x77F965B5, 
+    0x7D3C6CAC, 0xB1966C32, 0x3F196BD1, 0xF3B36B4F, 
+    0x2A9379E3, 0xE639797D, 0x68B67E9E, 0xA41C7E00, 
+    0xAED97719, 0x62737787, 0xECFC7064, 0x205670FA, 
+    0x85CD537D, 0x496753E3, 0xC7E85400, 0x0B42549E, 
+    0x01875D87, 0xCD2D5D19, 0x43A25AFA, 0x8F085A64, 
+    0x562848C8, 0x9A824856, 0x140D4FB5, 0xD8A74F2B, 
+    0xD2624632, 0x1EC846AC, 0x9047414F, 0x5CED41D1, 
+    0x299DC2ED, 0xE537C273, 0x6BB8C590, 0xA712C50E, 
+    0xADD7CC17, 0x617DCC89, 0xEFF2CB6A, 0x2358CBF4, 
+    0xFA78D958, 0x36D2D9C6, 0xB85DDE25, 0x74F7DEBB, 
+    0x7E32D7A2, 0xB298D73C, 0x3C17D0DF, 0xF0BDD041, 
+    0x5526F3C6, 0x998CF358, 0x1703F4BB, 0xDBA9F425, 
+    0xD16CFD3C, 0x1DC6FDA2, 0x9349FA41, 0x5FE3FADF, 
+    0x86C3E873, 0x4A69E8ED, 0xC4E6EF0E, 0x084CEF90, 
+    0x0289E689, 0xCE23E617, 0x40ACE1F4, 0x8C06E16A, 
+    0xD0EBA0BB, 0x1C41A025, 0x92CEA7C6, 0x5E64A758, 
+    0x54A1AE41, 0x980BAEDF, 0x1684A93C, 0xDA2EA9A2, 
+    0x030EBB0E, 0xCFA4BB90, 0x412BBC73, 0x8D81BCED, 
+    0x8744B5F4, 0x4BEEB56A, 0xC561B289, 0x09CBB217, 
+    0xAC509190, 0x60FA910E, 0xEE7596ED, 0x22DF9673, 
+    0x281A9F6A, 0xE4B09FF4, 0x6A3F9817, 0xA6959889, 
+    0x7FB58A25, 0xB31F8ABB, 0x3D908D58, 0xF13A8DC6, 
+    0xFBFF84DF, 0x37558441, 0xB9DA83A2, 0x7570833C, 
+    0x533B85DA, 0x9F918544, 0x111E82A7, 0xDDB48239, 
+    0xD7718B20, 0x1BDB8BBE, 0x95548C5D, 0x59FE8CC3, 
+    0x80DE9E6F, 0x4C749EF1, 0xC2FB9912, 0x0E51998C, 
+    0x04949095, 0xC83E900B, 0x46B197E8, 0x8A1B9776, 
+    0x2F80B4F1, 0xE32AB46F, 0x6DA5B38C, 0xA10FB312, 
+    0xABCABA0B, 0x6760BA95, 0xE9EFBD76, 0x2545BDE8, 
+    0xFC65AF44, 0x30CFAFDA, 0xBE40A839, 0x72EAA8A7, 
+    0x782FA1BE, 0xB485A120, 0x3A0AA6C3, 0xF6A0A65D, 
+    0xAA4DE78C, 0x66E7E712, 0xE868E0F1, 0x24C2E06F, 
+    0x2E07E976, 0xE2ADE9E8, 0x6C22EE0B, 0xA088EE95, 
+    0x79A8FC39, 0xB502FCA7, 0x3B8DFB44, 0xF727FBDA, 
+    0xFDE2F2C3, 0x3148F25D, 0xBFC7F5BE, 0x736DF520, 
+    0xD6F6D6A7, 0x1A5CD639, 0x94D3D1DA, 0x5879D144, 
+    0x52BCD85D, 0x9E16D8C3, 0x1099DF20, 0xDC33DFBE, 
+    0x0513CD12, 0xC9B9CD8C, 0x4736CA6F, 0x8B9CCAF1, 
+    0x8159C3E8, 0x4DF3C376, 0xC37CC495, 0x0FD6C40B, 
+    0x7AA64737, 0xB60C47A9, 0x3883404A, 0xF42940D4, 
+    0xFEEC49CD, 0x32464953, 0xBCC94EB0, 0x70634E2E, 
+    0xA9435C82, 0x65E95C1C, 0xEB665BFF, 0x27CC5B61, 
+    0x2D095278, 0xE1A352E6, 0x6F2C5505, 0xA386559B, 
+    0x061D761C, 0xCAB77682, 0x44387161, 0x889271FF, 
+    0x825778E6, 0x4EFD7878, 0xC0727F9B, 0x0CD87F05, 
+    0xD5F86DA9, 0x19526D37, 0x97DD6AD4, 0x5B776A4A, 
+    0x51B26353, 0x9D1863CD, 0x1397642E, 0xDF3D64B0, 
+    0x83D02561, 0x4F7A25FF, 0xC1F5221C, 0x0D5F2282, 
+    0x079A2B9B, 0xCB302B05, 0x45BF2CE6, 0x89152C78, 
+    0x50353ED4, 0x9C9F3E4A, 0x121039A9, 0xDEBA3937, 
+    0xD47F302E, 0x18D530B0, 0x965A3753, 0x5AF037CD, 
+    0xFF6B144A, 0x33C114D4, 0xBD4E1337, 0x71E413A9, 
+    0x7B211AB0, 0xB78B1A2E, 0x39041DCD, 0xF5AE1D53, 
+    0x2C8E0FFF, 0xE0240F61, 0x6EAB0882, 0xA201081C, 
+    0xA8C40105, 0x646E019B, 0xEAE10678, 0x264B06E6
+  };
+}

Added: hadoop/common/branches/branch-1/src/test/org/apache/hadoop/util/TestPureJavaCrc32.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-1/src/test/org/apache/hadoop/util/TestPureJavaCrc32.java?rev=1365591&view=auto
==============================================================================
--- hadoop/common/branches/branch-1/src/test/org/apache/hadoop/util/TestPureJavaCrc32.java
(added)
+++ hadoop/common/branches/branch-1/src/test/org/apache/hadoop/util/TestPureJavaCrc32.java
Wed Jul 25 14:01:28 2012
@@ -0,0 +1,301 @@
+/**
+ * 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.hadoop.util;
+
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.PrintStream;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Properties;
+import java.util.Random;
+import java.util.zip.CRC32;
+import java.util.zip.Checksum;
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * Unit test to verify that the pure-Java CRC32 algorithm gives
+ * the same results as the built-in implementation.
+ */
+public class TestPureJavaCrc32 {
+  private final CRC32 theirs = new CRC32();
+  private final PureJavaCrc32 ours = new PureJavaCrc32();
+
+  @Test
+  public void testCorrectness() throws Exception {
+    checkSame();
+
+    theirs.update(104);
+    ours.update(104);
+    checkSame();
+
+    checkOnBytes(new byte[] {40, 60, 97, -70}, false);
+    
+    checkOnBytes("hello world!".getBytes("UTF-8"), false);
+
+    for (int i = 0; i < 10000; i++) {
+      byte randomBytes[] = new byte[new Random().nextInt(2048)];
+      new Random().nextBytes(randomBytes);
+      checkOnBytes(randomBytes, false);
+    }
+    
+  }
+
+  private void checkOnBytes(byte[] bytes, boolean print) {
+    theirs.reset();
+    ours.reset();
+    checkSame();
+    
+    for (int i = 0; i < bytes.length; i++) {
+      ours.update(bytes[i]);
+      theirs.update(bytes[i]);
+      checkSame();
+    }
+
+    if (print) {
+      System.out.println("theirs:\t" + Long.toHexString(theirs.getValue())
+                         + "\nours:\t" + Long.toHexString(ours.getValue()));
+    }
+  
+    theirs.reset();
+    ours.reset();
+    
+    ours.update(bytes, 0, bytes.length);
+    theirs.update(bytes, 0, bytes.length);
+    if (print) {
+      System.out.println("theirs:\t" + Long.toHexString(theirs.getValue())
+                         + "\nours:\t" + Long.toHexString(ours.getValue()));
+    }
+
+    checkSame();
+    
+    if (bytes.length >= 10) {
+      ours.update(bytes, 5, 5);
+      theirs.update(bytes, 5, 5);
+      checkSame();
+    }
+  }
+
+  private void checkSame() {
+    Assert.assertEquals(theirs.getValue(), ours.getValue());
+  }
+
+  /**
+   * Generate a table to perform checksums based on the same CRC-32 polynomial
+   * that java.util.zip.CRC32 uses.
+   */
+  public static class Table {
+    private static final int polynomial = 0xEDB88320;
+
+    private final int[][] tables;
+
+    private Table(final int nBits, final int nTables) {
+      tables = new int[nTables][];
+      final int size = 1 << nBits;
+      for(int i = 0; i < tables.length; i++) {
+        tables[i] = new int[size];
+      }
+
+      //compute the first table
+      final int[] first = tables[0];
+      for (int i = 0; i < first.length; i++) {
+        int crc = i;
+        for (int j = 0; j < nBits; j++) {
+          if ((crc & 1) == 1) {
+            crc >>>= 1;
+            crc ^= polynomial;
+          } else {
+            crc >>>= 1;
+          }
+        }
+        first[i] = crc;
+      }
+
+      //compute the remaining tables
+      final int mask = first.length - 1;
+      for(int j = 1; j < tables.length; j++) {
+        final int[] previous = tables[j-1];
+        final int[] current = tables[j];
+        for (int i = 0; i < current.length; i++) {
+          current[i] = (previous[i] >>> nBits) ^ first[previous[i] & mask];
+        }
+      }
+    }
+
+    String[] toStrings(String nameformat) {
+      final String[] s = new String[tables.length];
+      for (int j = 0; j < tables.length; j++) {
+        final int[] t = tables[j];
+        final StringBuilder b = new StringBuilder();
+        b.append(String.format("  static final int[] " + nameformat
+            + " = new int[] {", j));
+        for (int i = 0; i < t.length;) {
+          b.append("\n    ");
+          for(int k = 0; k < 4; k++) {
+            b.append(String.format("0x%08X, ", t[i++]));
+          }
+        }
+        b.setCharAt(b.length() - 2, '\n');
+        s[j] = b.toString() + " };\n";
+      }
+      return s;
+    }
+
+    /** {@inheritDoc} */
+    public String toString() {
+      final StringBuilder b = new StringBuilder();
+      for(String s : toStrings(String.format("T%d_",
+          Integer.numberOfTrailingZeros(tables[0].length)) + "%d")) {
+        b.append(s);
+      }
+      return b.toString();
+    }
+
+    /** Generate CRC-32 lookup tables */
+    public static void main(String[] args) throws FileNotFoundException {
+      int i = 8;
+      final PrintStream out = new PrintStream(
+          new FileOutputStream("table" + i + ".txt"), true);
+      final Table t = new Table(i, 16);
+      final String s = t.toString();
+      System.out.println(s);
+      out.println(s);
+    }
+  }
+  
+  /**
+   * Performance tests to compare performance of the Pure Java implementation
+   * to the built-in java.util.zip implementation. This can be run from the
+   * command line with:
+   *
+   *   java -cp path/to/test/classes:path/to/common/classes \
+   *      'org.apache.hadoop.util.TestPureJavaCrc32$PerformanceTest'
+   *
+   * The output is in JIRA table format.
+   */
+  public static class PerformanceTest {
+    public static final int MAX_LEN = 32*1024*1024; // up to 32MB chunks
+    public static final int BYTES_PER_SIZE = MAX_LEN * 4;
+
+    static final Checksum zip = new CRC32(); 
+    static final Checksum[] CRCS = {new PureJavaCrc32()};
+
+    public static void main(String args[]) {
+      printSystemProperties(System.out);
+      doBench(CRCS, System.out);
+    }
+
+    private static void printCell(String s, int width, PrintStream out) {
+      final int w = s.length() > width? s.length(): width;
+      out.printf(" %" + w + "s |", s);
+    }
+
+    private static void doBench(final Checksum[] crcs, final PrintStream out) {
+      final ArrayList<Checksum> a = new ArrayList<Checksum>();
+      a.add(zip);
+      for (Checksum c : crcs)
+        if(c.getClass() != zip.getClass())
+          a.add(c);
+      doBench(a, out);
+    }
+
+    private static void doBench(final List<Checksum> crcs, final PrintStream out
+        ) {
+      final byte[] bytes = new byte[MAX_LEN];
+      new Random().nextBytes(bytes);
+
+      // Print header
+      out.printf("\nPerformance Table (The unit is MB/sec)\n||");
+      final String title = "Num Bytes";
+      printCell("Num Bytes", 0, out);
+      for (Checksum c : crcs) {
+        out.printf("|");
+        printCell(c.getClass().getSimpleName(), 8, out);
+      }
+      out.printf("|\n");
+
+      // Warm up implementations to get jit going.
+      for (Checksum c : crcs) {
+        doBench(c, bytes, 2, null);
+        doBench(c, bytes, 2101, null);
+      }
+
+      // Test on a variety of sizes
+      for (int size = 1; size < MAX_LEN; size *= 2) {
+        out.printf("|");
+        printCell(String.valueOf(size), title.length()+1, out);
+
+        Long expected = null;
+        for(Checksum c : crcs) {
+          System.gc();
+          final long result = doBench(c, bytes, size, out);
+          if(c.getClass() == zip.getClass()) {
+            expected = result;
+          } else if (result != expected) {
+            throw new RuntimeException(c.getClass() + " has bugs!");
+          }
+            
+        }
+        out.printf("\n");
+      }
+    }
+
+    private static long doBench(Checksum crc, byte[] bytes, int size,
+        PrintStream out) {
+      final String name = crc.getClass().getSimpleName();
+      final int trials = BYTES_PER_SIZE / size;
+
+      final long st = System.nanoTime();
+      crc.reset();
+      for (int i = 0; i < trials; i++) {
+        crc.update(bytes, 0, size);
+      }
+      final long result = crc.getValue();
+      final long et = System.nanoTime();
+
+      double mbProcessed = trials * size / 1024.0 / 1024.0;
+      double secsElapsed = (et - st) / 1000000000.0d;
+      if (out != null) {
+        final String s = String.format("%9.3f",  mbProcessed/secsElapsed);
+        printCell(s, name.length()+1, out);
+      }
+      return result;
+    }
+    
+    private static void printSystemProperties(PrintStream out) {
+      final String[] names = {
+          "java.version",
+          "java.runtime.name",
+          "java.runtime.version",
+          "java.vm.version",
+          "java.vm.vendor",
+          "java.vm.name",
+          "java.vm.specification.version",
+          "java.specification.version",
+          "os.arch",
+          "os.name",
+          "os.version"
+      };
+      final Properties p = System.getProperties();
+      for(String n : names) {
+        out.println(n + " = " + p.getProperty(n));
+      }
+    }
+  }
+}



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