CRC64

java.lang.Object
- org.jacoco.core.internal.data.CRC64

```
public final class CRC64
extends java.lang.Object
```
CRC64 checksum calculator based on the polynom specified in ISO 3309. The implementation is based on the following publications:
- http://en.wikipedia.org/wiki/Cyclic_redundancy_check
- http://www.geocities.com/SiliconValley/Pines/8659/crc.htm

Field Summary

Fields
Modifier and Type Field Description

private static long[] LOOKUPTABLE

private static long POLY64REV

Constructor Summary

Constructors
Modifier Constructor Description

private CRC64()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static long`	`classId(byte[] bytes)`	Calculates class identifier for the given class bytes.
`private static long`	`update(long sum, byte b)`	Updates given checksum by given byte.
`private static long`	`update(long sum, byte[] bytes, int fromIndexInclusive, int toIndexExclusive)`	Updates given checksum by bytes from given array.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - POLY64REV
```
private static final long POLY64REV
```
    See Also:
    
    Constant Field Values
  - LOOKUPTABLE
```
private static final long[] LOOKUPTABLE
```
- Constructor Detail
  - CRC64
```
private CRC64()
```
- Method Detail
  - update
```
private static long update(long sum,
                           byte b)
```
    Updates given checksum by given byte.
    
    Parameters:
    
    sum - initial checksum value
    
    b - byte to update the checksum with
    
    Returns:
    
    updated checksum value
  - update
```
private static long update(long sum,
                           byte[] bytes,
                           int fromIndexInclusive,
                           int toIndexExclusive)
```
    Updates given checksum by bytes from given array.
    
    Parameters:
    
    sum - initial checksum value
    
    bytes - byte array to update the checksum with
    
    fromIndexInclusive - start index in array, inclusive
    
    toIndexExclusive - end index in array, exclusive
    
    Returns:
    
    updated checksum value
  - classId
```
public static long classId(byte[] bytes)
```
    Calculates class identifier for the given class bytes.
    
    Parameters:
    
    bytes - class bytes
    
    Returns:
    
    class identifier