Package org.apache.commons.codec.digest
Class PureJavaCrc32C
- java.lang.Object
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- org.apache.commons.codec.digest.PureJavaCrc32C
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- All Implemented Interfaces:
java.util.zip.Checksum
public class PureJavaCrc32C extends java.lang.Object implements java.util.zip.Checksum
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. Copied from Hadoop 2.3.6: https://git-wip-us.apache.org/repos/asf?p=hadoop.git;a=blob_plain; f=hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/PureJavaCrc32C.java; hb=2120de588b92b9f22b1cc4188761d6a8c61aa778This class is Not ThreadSafe
- Since:
- 1.11
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Field Summary
Fields Modifier and Type Field Description private int
crc
the current CRC value, bit-flippedprivate static int[]
T
private static int
T8_0_start
private static int
T8_1_start
private static int
T8_2_start
private static int
T8_3_start
private static int
T8_4_start
private static int
T8_5_start
private static int
T8_6_start
private static int
T8_7_start
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Constructor Summary
Constructors Constructor Description PureJavaCrc32C()
Create a new PureJavaCrc32 object.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description long
getValue()
void
reset()
void
update(byte[] b, int off, int len)
void
update(int b)
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Field Detail
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crc
private int crc
the current CRC value, bit-flipped
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T8_0_start
private static final int T8_0_start
- See Also:
- Constant Field Values
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T8_1_start
private static final int T8_1_start
- See Also:
- Constant Field Values
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T8_2_start
private static final int T8_2_start
- See Also:
- Constant Field Values
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T8_3_start
private static final int T8_3_start
- See Also:
- Constant Field Values
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T8_4_start
private static final int T8_4_start
- See Also:
- Constant Field Values
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T8_5_start
private static final int T8_5_start
- See Also:
- Constant Field Values
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T8_6_start
private static final int T8_6_start
- See Also:
- Constant Field Values
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T8_7_start
private static final int T8_7_start
- See Also:
- Constant Field Values
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T
private static final int[] T
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Method Detail
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getValue
public long getValue()
- Specified by:
getValue
in interfacejava.util.zip.Checksum
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reset
public void reset()
- Specified by:
reset
in interfacejava.util.zip.Checksum
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update
public void update(byte[] b, int off, int len)
- Specified by:
update
in interfacejava.util.zip.Checksum
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update
public final void update(int b)
- Specified by:
update
in interfacejava.util.zip.Checksum
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