Module org.refcodes.numerical

Package org.refcodes.numerical

Class CrcAlgorithmImpl

java.lang.Object

org.refcodes.numerical.CrcAlgorithmImpl

All Implemented Interfaces:

org.refcodes.mixin.NameAccessor, CrcAlgorithm, CrcWidthAccessor

public class CrcAlgorithmImpl
extends Object
implements CrcAlgorithm

Implementation of the CrcAlgorithm interface. Credits to [Anton Isakov (http://crccalc.com) of the "Online CRC-8 CRC-16 CRC-32 Calculator" (https://crccalc.com)'s GitHub (https://github.com/meetanthony/crcjava.git) repository.

Nested Class Summary

Nested classes/interfaces inherited from interface org.refcodes.numerical.CrcWidthAccessor

CrcWidthAccessor.CrcWidthBuilder<B extends CrcWidthAccessor.CrcWidthBuilder<B>>, CrcWidthAccessor.CrcWidthMutator, CrcWidthAccessor.CrcWidthProperty

Nested classes/interfaces inherited from interface org.refcodes.mixin.NameAccessor

org.refcodes.mixin.NameAccessor.NameBuilder<B extends org.refcodes.mixin.NameAccessor.NameBuilder<B>>, org.refcodes.mixin.NameAccessor.NameMutator, org.refcodes.mixin.NameAccessor.NameProperty

Constructor Summary

Constructors

Constructor	Description
CrcAlgorithmImpl(String aName, int aCrcBitWidth, long aPolynomial, long aInitCrc, boolean aRefIn, boolean aRefOut, long aXorOut)	Constructs a CrcAlgorithm instance.

Method Summary

Modifier and Type	Method	Description
CrcSize	getCrcSize()	Returns the CrcSize (describing the checksum's "CRC byte length" for this CrcStandard.
int	getCrcWidth()	Retrieves the value from the CRC byte width (number of bytes used to store a CRC checksum) property.
String	getName()
byte[]	toCrcBytes(byte[] aData, int aOffset, int aLength, Endianess aEndianess)	Calculates the according checksum from the supplied data data and returns the according byte array of the CRC checksum.
byte[]	toCrcBytes(byte[] aData, Endianess aEndianess)	Calculates the according checksum from the supplied data data and returns the according byte array of the CRC checksum.
byte[]	toCrcBytes(byte aData, Endianess aEndianess)	Calculates the according checksum from the supplied data and returns the according byte array of the CRC checksum.
byte[]	toCrcBytes(long aCrc, byte[] aData, int aOffset, int aLength, Endianess aEndianess)	Updates the according checksum with he supplied data data and returns the according byte array of the CRC checksum.
byte[]	toCrcBytes(long aCrc, byte[] aData, Endianess aEndianess)	Updates the according checksum with he supplied data data and returns the according byte array of the CRC checksum.
byte[]	toCrcBytes(long aCrc, byte aData, Endianess aEndianess)	Updates the according checksum with he supplied data data and returns the according byte array of the CRC checksum.
long	toCrcChecksum(byte aData)	Calculates the according checksum from the supplied data.
long	toCrcChecksum(byte[] aData)	Calculates the according checksum from the supplied data.
long	toCrcChecksum(byte[] aData, int aOffset, int aLength)	Calculates the according checksum from the supplied data.
long	toCrcChecksum(long aCrc, byte aData)	Updates the according checksum with he supplied data.
long	toCrcChecksum(long aCrc, byte[] aData)	Updates the according checksum with he supplied data.
long	toCrcChecksum(long aCrc, byte[] aData, int aOffset, int aLength)	Updates the according checksum with he supplied data.

Methods inherited from class java.lang.Object

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

Constructor Details

CrcAlgorithmImpl

public CrcAlgorithmImpl(String aName,
 int aCrcBitWidth,
 long aPolynomial,
 long aInitCrc,
 boolean aRefIn,
 boolean aRefOut,
 long aXorOut)

Constructs a CrcAlgorithm instance. For sound init arguments please use predefined CrcAlgorithm instances defined in the CrcStandard enumeration.

Parameters:

aName - The descriptive name of the algorithm.

aCrcBitWidth - "This is hash size." [Anton Isakov http://crccalc.com]

aPolynomial - "This parameter is the poly. This is a binary value that should be specified as a hexadecimal number.The top bit of the poly should be omitted.For example, if the poly is 10110, you should specify 06. An important aspect of this parameter is that it represents the unreflected poly; the bottom bit of this parameter is always the LSB of the divisor during the division regardless of whether the algorithm being modelled is reflected." [Anton Isakov http://crccalc.com]

aInitCrc - "This parameter specifies the initial value of the register when the algorithm starts.This is the value that is to be assigned to the register in the direct table algorithm. In the table algorithm, we may think of the register always commencing with the value zero, and this value being XORed into the register after the N'th bit iteration. This parameter should be specified as a hexadecimal number." [Anton Isakov http://crccalc.com]

aRefIn - "This parameter is the poly. This is a binary value that should be specified as a hexadecimal number.The top bit of the poly should be omitted.For example, if the poly is 10110, you should specify 06. An important aspect of this parameter is that it represents the unreflected poly; the bottom bit of this parameter is always the LSB of the divisor during the division regardless of whether the algorithm being modelled is reflected." [Anton Isakov http://crccalc.com]

aRefOut - "This is a boolean parameter. If it is set to FALSE, the final value in the register is fed into the XOROUT stage directly, otherwise, if this parameter is TRUE, the final register value is reflected first." [Anton Isakov http://crccalc.com]

aXorOut - "This is an W-bit value that should be specified as a hexadecimal number.It is XORed to the final register value (after the REFOUT) stage before the value is returned as the official checksum." [Anton Isakov http://crccalc.com]

Method Details

toCrcChecksum

public long toCrcChecksum(byte aData)

Calculates the according checksum from the supplied data.

Specified by:

toCrcChecksum in interface CrcAlgorithm

Parameters:

aData - The data for which to calculate the checksum.

Returns:

The according checksum.

toCrcChecksum

public long toCrcChecksum(long aCrc,
 byte aData)

Updates the according checksum with he supplied data.

Specified by:

toCrcChecksum in interface CrcAlgorithm

Parameters:

aCrc - The CRC checksum to be updated.

aData - The data for which to calculate the checksum.

Returns:

The accordingly updated checksum.

toCrcChecksum

public long toCrcChecksum(byte[] aData)

Calculates the according checksum from the supplied data.

Specified by:

toCrcChecksum in interface CrcAlgorithm

Parameters:

aData - The data for which to calculate the checksum.

Returns:

The according checksum.

toCrcChecksum

public long toCrcChecksum(long aCrc,
 byte[] aData)

Updates the according checksum with he supplied data.

Specified by:

toCrcChecksum in interface CrcAlgorithm

Parameters:

aCrc - The CRC checksum to be updated.

aData - The data for which to calculate the checksum.

Returns:

The accordingly updated checksum.

toCrcChecksum

public long toCrcChecksum(byte[] aData,
 int aOffset,
 int aLength)

Calculates the according checksum from the supplied data.

Specified by:

toCrcChecksum in interface CrcAlgorithm

Parameters:

aData - The data for which to calculate the checksum.

aOffset - The offset from where to start.

aLength - The number of bytes to cover.

Returns:

The according checksum.

toCrcChecksum

public long toCrcChecksum(long aCrc,
 byte[] aData,
 int aOffset,
 int aLength)

Updates the according checksum with he supplied data.

Specified by:

toCrcChecksum in interface CrcAlgorithm

Parameters:

aCrc - The CRC checksum to be updated.

aData - The data for which to calculate the checksum.

aOffset - The offset from where to start.

aLength - The number of bytes to cover.

Returns:

The accordingly updated checksum.

toCrcBytes

public byte[] toCrcBytes(byte aData,
 Endianess aEndianess)

Calculates the according checksum from the supplied data and returns the according byte array of the CRC checksum.

Specified by:

toCrcBytes in interface CrcAlgorithm

Parameters:

aData - The data for which to calculate the checksum.

aEndianess - The Endianess (big endian or little endian) of the resulting bytes representing the CRC checksum.

Returns:

The according checksum.

toCrcBytes

public byte[] toCrcBytes(long aCrc,
 byte aData,
 Endianess aEndianess)

Updates the according checksum with he supplied data data and returns the according byte array of the CRC checksum.

Specified by:

toCrcBytes in interface CrcAlgorithm

Parameters:

aCrc - The CRC checksum to be updated.

aData - The data for which to calculate the checksum.

aEndianess - The Endianess (big endian or little endian) of the resulting bytes representing the CRC checksum.

Returns:

The accordingly updated checksum.

toCrcBytes

public byte[] toCrcBytes(byte[] aData,
 Endianess aEndianess)

Calculates the according checksum from the supplied data data and returns the according byte array of the CRC checksum.

Specified by:

toCrcBytes in interface CrcAlgorithm

Parameters:

aData - The data for which to calculate the checksum.

aEndianess - The Endianess (big endian or little endian) of the resulting bytes representing the CRC checksum.

Returns:

The according checksum.

toCrcBytes

public byte[] toCrcBytes(long aCrc,
 byte[] aData,
 Endianess aEndianess)

Updates the according checksum with he supplied data data and returns the according byte array of the CRC checksum.

Specified by:

toCrcBytes in interface CrcAlgorithm

Parameters:

aCrc - The CRC checksum to be updated.

aData - The data for which to calculate the checksum.

aEndianess - The Endianess (big endian or little endian) of the resulting bytes representing the CRC checksum.

Returns:

The accordingly updated checksum.

toCrcBytes

public byte[] toCrcBytes(byte[] aData,
 int aOffset,
 int aLength,
 Endianess aEndianess)

Calculates the according checksum from the supplied data data and returns the according byte array of the CRC checksum.

Specified by:

toCrcBytes in interface CrcAlgorithm

Parameters:

aData - The data for which to calculate the checksum.

aOffset - The offset from where to start.

aLength - The number of bytes to cover.

aEndianess - The Endianess (big endian or little endian) of the resulting bytes representing the CRC checksum.

Returns:

The according checksum.

toCrcBytes

public byte[] toCrcBytes(long aCrc,
 byte[] aData,
 int aOffset,
 int aLength,
 Endianess aEndianess)

Updates the according checksum with he supplied data data and returns the according byte array of the CRC checksum.

Specified by:

toCrcBytes in interface CrcAlgorithm

Parameters:

aCrc - The CRC checksum to be updated.

aData - The data for which to calculate the checksum.

aOffset - The offset from where to start.

aLength - The number of bytes to cover.

aEndianess - The Endianess (big endian or little endian) of the resulting bytes representing the CRC checksum.

Returns:

The accordingly updated checksum.

getCrcWidth

public int getCrcWidth()

Retrieves the value from the CRC byte width (number of bytes used to store a CRC checksum) property.

Specified by:

getCrcWidth in interface CrcWidthAccessor

Returns:

The name stored by the CRC byte width (number of bytes used to store a CRC checksum) property.

getCrcSize

public CrcSize getCrcSize()

Returns the CrcSize (describing the checksum's "CRC byte length" for this CrcStandard.

Specified by:

getCrcSize in interface CrcAlgorithm

Returns:

The according CrcSize.

getName

public String getName()

Specified by:

getName in interface org.refcodes.mixin.NameAccessor