com.ibm.cos.v2.checksums.internal

Class CrcCombineOnMarkChecksum

java.lang.Object

com.ibm.cos.v2.checksums.internal.CrcCombineOnMarkChecksum

All Implemented Interfaces:

SdkChecksum, Checksum

public class CrcCombineOnMarkChecksum
extends Object
implements SdkChecksum

Class that provides functionality for combining CRC checksums with mark and reset capabilities.

This class allows combining two CRC values, making it efficient to update and restore the checksum during mark and reset operations. It is particularly useful in scenarios where a checksum needs to be marked, potentially reset to a previous state, and combined with additional data.

The class maintains an internal Checksum instance and uses a BiFunction to combine two CRC values when necessary. The combine function is applied to a pair of CRC values, along with the length of the data, to produce the resulting combined checksum.

Constructor Summary

Constructors

Constructor and Description
CrcCombineOnMarkChecksum(Checksum checksum, CrcCombineFunction crcCombineFunction)

Method Summary

Modifier and Type	Method and Description
byte[]	getChecksumBytes() Returns the computed checksum in a byte array rather than the long provided by Checksum.getValue().
long	getValue()
void	mark(int readLimit) Allows marking a checksum for checksums that support the ability to mark and reset.
void	reset()
void	update(byte[] b, int off, int len)
void	update(int b)

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.ibm.cos.v2.checksums.SdkChecksum

forAlgorithm, update, update

Constructor Detail

CrcCombineOnMarkChecksum

public CrcCombineOnMarkChecksum(Checksum checksum,
                                CrcCombineFunction crcCombineFunction)

Method Detail

getChecksumBytes

public byte[] getChecksumBytes()

Description copied from interface: SdkChecksum

Returns the computed checksum in a byte array rather than the long provided by Checksum.getValue().

Specified by:

getChecksumBytes in interface SdkChecksum

Returns:

byte[] containing the checksum

mark

public void mark(int readLimit)

Description copied from interface: SdkChecksum

Allows marking a checksum for checksums that support the ability to mark and reset.

Specified by:

mark in interface SdkChecksum

Parameters:

readLimit - the maximum limit of bytes that can be read before the mark position becomes invalid.

update

public void update(int b)

Specified by:

update in interface Checksum

update

public void update(byte[] b,
                   int off,
                   int len)

Specified by:

update in interface Checksum

getValue

public long getValue()

Specified by:

getValue in interface Checksum

reset

public void reset()

Specified by:

reset in interface Checksum