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//start of LhaChecksum.java
//TEXT_STYLE:CODE=Shift_JIS(Japanese):RET_CODE=CRLF
/**
* LhaChecksum.java
*
* Copyright (C) 2001-2002 Michel Ishizuka All rights reserved.
*
* ȉ̏ɓӂȂ\[XƃoCi`̍ĔzzƎgp
* ύX̗Lɂ炸B
*
* PD\[XR[h̍ĔzzɂĒ쌠\ ̏̃Xg
* щL̐ێȂĂ͂ȂȂB
*
* QDoCi`̍ĔzzɂĒ쌠\ ̏̃Xg
* щL̐gp ̑̔zz
* ܂ގɋLqȂȂȂB
*
* ̃\tgEFA͐Β˔ڂɂĖۏŒA̖
* IBłƂۏAilLƂۏɂƂǂ܂炸A
* Ȃ閾IшÎIȕۏȂB
* Β˔ڂ ̃\tgEFA̎gpɂ钼ړIAԐړIA
* IAȁAT^IȁA邢͕KRIȑQ(gpɂf[^
* AƖ̒f〈܂Ăv̈⎸Ai
* T[rX̓l邪AĂꂾɌ肳Ȃ
* Q)ɑāAȂ鎖Ԃ̌ƂȂƂĂA_̐
* C△ߎӔC܂ ȂӔC낤ƂAƂꂪs
* ŝׂ߂łƂĂA܂͂̂悤ȑQ̉\
* ĂƂĂ̐ӔCȂ̂ƂB
*/
package jp.gr.java_conf.dangan.util.lha;
//import classes and interfaces
import java.util.zip.Checksum;
//import exceptions
/**
* LHAŎgp P 1oCg̃`FbNTl
* Zo邽߂̃NXB
*
* <pre>
* -- revision history --
* $Log: LhaChecksum.java,v $
* Revision 1.0 2002/08/05 00:00:00 dangan
* add to version control
* [maintanance]
* \[X
* ^up~
* CZX̏C
*
* </pre>
*
* @author $Author: dangan $
* @version $Revision: 1.0 $
*/
public class LhaChecksum implements Checksum{
//------------------------------------------------------------------
// instance field
//------------------------------------------------------------------
// private int checksum
//------------------------------------------------------------------
/**
* `FbNTl
*/
private int checksum;
//------------------------------------------------------------------
// constructor
//------------------------------------------------------------------
// public LhaChecksum()
//------------------------------------------------------------------
/**
* V `FbNTNX쐬B
*/
public LhaChecksum(){
super();
this.reset();
}
//------------------------------------------------------------------
// method of java.util.zip.Checksum method
//------------------------------------------------------------------
// update
//------------------------------------------------------------------
// public void update( int byte8 )
// public void update( byte[] buffer )
// public void update( byte[] buffer, int index, int length )
//------------------------------------------------------------------
/**
* byte8 Ŏw肵 1oCg̃f[^ `FbNTlXVB
*
* @param byte8 `FbNTXV1oCg̃f[^
*/
public void update( int byte8 ){
this.checksum += byte8;
}
/**
* buffer Ŏw肵oCgz `FbNTlXVB
* ̃\bh
* update( buffer, 0, buffer.length )
* ƓB
*
* @param buffer `FbNTXVf[^oCgz
*/
public void update( byte[] buffer ){
this.update( buffer, 0, buffer.length );
}
/**
* buffer Ŏw肵oCgz `FbNTlXVB
*
* @param buffer `FbNTXVf[^oCgz
* @param index f[^̊Jnʒu
* @param length `FbNT̍XVɎgoCg
*/
public void update( byte[] buffer, int index, int length ){
while( 0 < length-- )
this.checksum += buffer[index++];
}
//------------------------------------------------------------------
// method of java.util.zip.Checksum
//------------------------------------------------------------------
// other
//------------------------------------------------------------------
// public void reset()
// public long getValue()
//------------------------------------------------------------------
/**
* `FbNTllɐݒ肵ȂB
*/
public void reset(){
this.checksum = 0;
}
/**
* `FbNTlB
* `FbNTl 1oCg̒lłA
* 0x00`0xFFɃ}bvB
*
* @return `FbNTl
*/
public long getValue(){
return this.checksum & 0xFF;
}
}
//end of LhaChecksum.java
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