com.eyebolt.iplib
Class CRCCalc

java.lang.Object
  |
  +--com.eyebolt.iplib.CRCCalc

class CRCCalc

extends java.lang.Object

Encapsulate operations to calculate CRC on some object.

Version:

0.01, 12 Feb 1998

Author:

John Gardner

Field Summary

(package private) static short	CRC_NORMAL
(package private) static int	CRC16
(package private) static short[]	crctab
(package private) int	crctype
(package private) boolean	firsttime
(package private) int	shortCount keep track of # of shorts; add an extra before a long
(package private) short	value

Constructor Summary

CRCCalc()
Constructs a CRCCalc

Method Summary

(package private) short	crchware(short data, int genpoly, short accum) Description of the Method
(package private) short	crcrevhware(short data, int genpoly, short accum) Description of the Method
(package private) void	crcrevupdate(short data) Description of the Method
(package private) void	crcupdate(short data) Description of the Method
long	getValue() Gets the Value attribute of the CRCCalc object
(package private) short[]	mk_crctbl(int poly) Description of the Method
void	update(byte[] bytes) Add some bytes to the CRC to be calculated
void	updateInteger(int val) Add an integer value to the CRC to be calculated
void	updateShort(short s) Add a short value to the CRC to be calculated

Methods inherited from class java.lang.Object

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

Field Detail

crctype

int crctype

value

short value

firsttime

boolean firsttime

shortCount

int shortCount

keep track of # of shorts; add an extra before a long

CRC16

static final int CRC16

CRC_NORMAL

static final short CRC_NORMAL

crctab

static short[] crctab

Constructor Detail

CRCCalc

public CRCCalc()

Constructs a CRCCalc

Method Detail

getValue

public long getValue()

Gets the Value attribute of the CRCCalc object

Returns:

The Value value

updateInteger

public void updateInteger(int val)

Add an integer value to the CRC to be calculated

Parameters:

val - the int to add

updateShort

public void updateShort(short s)

Add a short value to the CRC to be calculated

Parameters:

s - the short to add

update

public void update(byte[] bytes)

Add some bytes to the CRC to be calculated

Parameters:

bytes - the bytes to add

crcrevhware

short crcrevhware(short data,
                  int genpoly,
                  short accum)

Description of the Method

Parameters:

data - Description of Parameter

genpoly - Description of Parameter

accum - Description of Parameter

Returns:

Description of the Returned Value

crchware

short crchware(short data,
               int genpoly,
               short accum)

Description of the Method

Parameters:

data - Description of Parameter

genpoly - Description of Parameter

accum - Description of Parameter

Returns:

Description of the Returned Value

mk_crctbl

short[] mk_crctbl(int poly)

Description of the Method

Parameters:

poly - Description of Parameter

Returns:

Description of the Returned Value

crcupdate

void crcupdate(short data)

Description of the Method

Parameters:

data - Description of Parameter

crcrevupdate

void crcrevupdate(short data)

Description of the Method

Parameters:

data - Description of Parameter