Package org.yamcs.tctm.ccsds.error

Class CrcCciitCalculator

java.lang.Object

org.yamcs.tctm.ccsds.error.CrcCciitCalculator

All Implemented Interfaces:

ErrorDetectionWordCalculator

public class CrcCciitCalculator
extends Object
implements ErrorDetectionWordCalculator

Cylcic Redundancy Check (CRC-CCIIT 0xFFFF) with the polynomial:

1 + x^5 + x^12 + x^16

Also specified in: CCSDS TC Space Data Link Protocol (CCSDS 232.0-B-3), CCSDS TM Space Data Link Protocol (CCSDS 132.0-B-3) and CCSDS AOS Space Data Link Protocol (CCSDS 732.0-B-4)

Constructor Summary

Constructors

Constructor	Description
CrcCciitCalculator()
CrcCciitCalculator(YConfiguration c)

Method Summary

Modifier and Type	Method	Description
int	compute(byte[] data, int offset, int length)	Compute the checksum on the data buffer starting at offset and taking into account length bytes
int	compute(ByteBuffer data, int offset, int length)
int	sizeInBits()

Methods inherited from class java.lang.Object

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

Constructor Details

CrcCciitCalculator

public CrcCciitCalculator()

CrcCciitCalculator

public CrcCciitCalculator(YConfiguration c)

Method Details

compute

public int compute(byte[] data,
 int offset,
 int length)

Description copied from interface: ErrorDetectionWordCalculator

Compute the checksum on the data buffer starting at offset and taking into account length bytes

Specified by:

compute in interface ErrorDetectionWordCalculator

Returns:

compute

public int compute(ByteBuffer data,
 int offset,
 int length)

sizeInBits

public int sizeInBits()

Specified by:

sizeInBits in interface ErrorDetectionWordCalculator

Returns:

size in bits of the calculated checksum (max 32)