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//start of HashDefault.java
//TEXT_STYLE:CODE=Shift_JIS(Japanese):RET_CODE=CRLF
/**
* HashDefault.java
*
* Copyright (C) 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 jp.gr.java_conf.dangan.util.lha.HashMethod;
//import exceptions
/**
* vO ar940528 LHa for Unix ŎgpĂnbVB<br>
* gzip ŎgpĂQlɂ悤B<br>
*
* <pre>
* -- revision history --
* $Log: HashDefault.java,v $
* Revision 1.0 2002/08/05 00:00:00 dangan
* add to version control
* [change]
* HashMethod ̃C^tFCXύXɂ킹ăCetFCXύXB
* RXgN^ň`FbN폜B
* [maintanance]
* \[X
* ^up~
* CZX̏C
*
* </pre>
*
* @author $Author: dangan $
* @version $Revision: 1.0 $
*/
public class HashDefault implements HashMethod{
//------------------------------------------------------------------
// class field
//------------------------------------------------------------------
// private static final int HashMask
//------------------------------------------------------------------
/**
* nbVl邽߂̃}XNl
*/
private static final int HashMask = 0x7FFF;
//------------------------------------------------------------------
// instance field
//------------------------------------------------------------------
// private byte[] TextBuffer
//------------------------------------------------------------------
/**
* LZSSk{߂̃obt@B
* Ö͎A
* 㔼͈k{߂̃f[^̓obt@B
* HashMethod̎ł Hashl̐̂߂̓ǂݍ݂ɂ̂ݎgpB
*/
private byte[] TextBuffer;
//------------------------------------------------------------------
// constructor
//------------------------------------------------------------------
// private HashDefault()
// public HashDefault( byte[] TextBuffer )
//------------------------------------------------------------------
/**
* ftHgRXgN^B
* gps
*/
private HashDefault(){ }
/**
* ar940528 LHa for Unix ŎgpĂnbV\zB
*
* @param TextBuffer LZSSkp̃obt@B
* Hashl̂ߓǂݍݗpɎgpB
*/
public HashDefault( byte[] TextBuffer ){
this.TextBuffer = TextBuffer;
}
//------------------------------------------------------------------
// method of jp.gr.java_conf.dangan.util.lha.HashMethod
//------------------------------------------------------------------
// public int hash( int position )
// public int hashRequires()
// public int tableSize()
//------------------------------------------------------------------
/**
* nbVB<br>
* RXgN^œnꂽ TextBuffer position
* f[^p^ hashlB
*
* @param position f[^p^̊Jnʒu
*
* @return nbVl
*/
public int hash( int position ){
return ( ( ( this.TextBuffer[ position ] << 5 )
^ ( this.TextBuffer[ position + 1 ] & 0xFF ) )
<< 5 ^( this.TextBuffer[ position + 2 ] & 0xFF ) )
& HashDefault.HashMask;
}
/**
* nbVnbVl邽߂ɎgpoCgB<br>
* ̃nbV 3oCg̃f[^
* VtgXORgpănbVl邽߁A
* ̃\bh͏ 3 ԂB
*
* @return 3
*/
public int hashRequires(){
return 3;
}
/**
* nbVe[ũTCYB<br>
* ̃nbV 0x0000 ` 0x7FFF ̃nbVl邽߁A
* ̃\bh͏ 0x8000(32768) ԂB
*
* @return 0x8000(32768)
*/
public int tableSize(){
return 0x8000;
}
}
//end of HashDefault.java
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