Package com.scurrilous.circe.crc

Class AbstractLongCrc

java.lang.Object

com.scurrilous.circe.impl.AbstractIncrementalLongHash

com.scurrilous.circe.crc.AbstractLongCrc

All Implemented Interfaces:

Hash, IncrementalLongHash, StatelessHash, StatelessLongHash

Direct Known Subclasses:

NormalLongCrc, ReflectedLongCrc

abstract class AbstractLongCrc
extends AbstractIncrementalLongHash

Base implementation of long-width CRC functions.

Field Summary

Fields

Modifier and Type	Field	Description
protected final int	bitWidth

Constructor Summary

Constructors

Constructor	Description
AbstractLongCrc(String algorithm, int bitWidth, long initial, long xorOut)

Method Summary

Modifier and Type	Method	Description
String	algorithm()	Returns the canonical name of this hash algorithm.
protected long	initial()	The initial state of the hash function, which is the same as the output value for an empty input sequence.
int	length()	Returns the length in bytes of the output of this hash function.
protected final long	reflect(long value)
protected abstract long	resumeRaw(long crc, byte[] input, int index, int length)
protected long	resumeUnchecked(long current, byte[] input, int index, int length)	Evaluates this hash function as if the given range of the given input array were appended to the previously hashed input.

Methods inherited from class com.scurrilous.circe.impl.AbstractIncrementalLongHash

calculate, calculate, calculate, calculate, createStateful, resume, resume, resume, resume, supportsUnsafe

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

bitWidth

protected final int bitWidth

Constructor Details

AbstractLongCrc

AbstractLongCrc(String algorithm,
 int bitWidth,
 long initial,
 long xorOut)

Method Details

algorithm

public String algorithm()

Description copied from interface: Hash

Returns the canonical name of this hash algorithm.

Returns:

the name of this hash algorithm

length

public int length()

Description copied from interface: Hash

Returns the length in bytes of the output of this hash function.

Returns:

the hash length in bytes

initial

protected long initial()

Description copied from class: AbstractIncrementalLongHash

The initial state of the hash function, which is the same as the output value for an empty input sequence.

Specified by:

initial in class AbstractIncrementalLongHash

Returns:

the initial hash state/output

resumeUnchecked

protected long resumeUnchecked(long current,
 byte[] input,
 int index,
 int length)

Description copied from class: AbstractIncrementalLongHash

Evaluates this hash function as if the given range of the given input array were appended to the previously hashed input. The index and length parameters have already been validated.

Specified by:

resumeUnchecked in class AbstractIncrementalLongHash

Parameters:

current - the hash output for input hashed so far

input - the input array

index - the starting index of the first input byte

length - the length of the input range

Returns:

the output of the hash function for the concatenated input

resumeRaw

protected abstract long resumeRaw(long crc,
 byte[] input,
 int index,
 int length)

reflect

protected final long reflect(long value)